Voltage Injection Detection (e.g., Voltage Injected At Startup To Determine Position, Etc.) Patents (Class 318/400.33)
  • Patent number: 11114961
    Abstract: A motor driving control device includes a motor driving unit, a position detection unit, a current detection unit and a control unit. The control unit includes a change detecting means configured to detect a predetermined phase change in the position signal, a first switching means configured to sequentially switch energization patterns of the coils with the plurality of phases based on a timing when the phase change is detected, and a second switching means configured to, in a state where the change detecting means does not detect the phase change, when a value of the drive current becomes a predetermined first threshold or more during a monitoring time period after a timing when the predetermined phase change in the position signal is expected, perform an operation to forcibly switch to a next energization pattern regardless of the timing of switching the energization pattern by the first switching means.
    Type: Grant
    Filed: February 6, 2020
    Date of Patent: September 7, 2021
    Assignee: MINEBEA MITSUMI INC.
    Inventors: Hiroyuki Kaidu, Wataru Nogamida, Masato Aoki
  • Patent number: 11108346
    Abstract: The method for detecting a position error of an electronically commutated actuator drive between an assumed position and an actual position of the actuator drive includes performing a position control procedure for the position of the actuator drive. The method further includes providing data with regard to the assumed position of the actuator drive. The method further includes forming an electric space vector value to generate a component of a stator magnetic field that extends parallel with a direction of an exciter magnetic field that prevails in the case of the assumed position of the actuator drive. The method further includes detecting whether a movement of the actuator drive has occurred as a result of generating the component of the exciter magnetic field.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: August 31, 2021
    Assignee: Robert Bosch GmbH
    Inventors: Florian Malchow, Udo Sieber, Dieter Schwarzmann, Tobias Mauk, Andreas Ortseifen
  • Patent number: 10971991
    Abstract: A controller of each power conversion device in a power conversion system controls a switching element unit, based on a detected value of reactor current flowing through a filter reactor, a detected value of output voltage output between the terminals of a filter capacitor, and a detected value of output current flowing through an output reactor. The controller generates a voltage command based on the output current and the output voltage and generates a correction amount of the voltage command based on the output current in which a reference frequency component is removed. The controller generates a current command based on the addition value of the voltage command and the correction amount and controls the switching element unit such that the reactor current matches the current command.
    Type: Grant
    Filed: February 19, 2018
    Date of Patent: April 6, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takahiro Kato, Kikuo Izumi, Akiko Tabuchi
  • Patent number: 10965227
    Abstract: An electric motor comprising: a stator; a rotor having a magnet mounted thereto; an electric circuit comprising a plurality of phases or windings for driving rotation of a rotor, in a drive mode; and a controller configured to control the electric circuit, in a motor braking mode, to short at least one of said phases or windings such that the magnet is able to generate a braking current in the shorted phase or winding wherein the motor is configured to operate at a rated current in the drive mode and to have a reactance such that the amplitude of the braking current is the same or lower than the amplitude of the rated current.
    Type: Grant
    Filed: August 6, 2019
    Date of Patent: March 30, 2021
    Assignee: GOODRICH ACTUATION SYSTEMS LIMITED
    Inventor: Maamar Benarous
  • Patent number: 10848083
    Abstract: In an embodiment, a method for detecting the angular position of the rotor of an electric motor includes an inductive-sense procedure implemented by applying to the windings of the electric motor a time sequence of position-detection pulse signals, detecting a corresponding time sequence of response signals, integrating the response signals, and recording respective times taken by the response signals to reach an integral reference threshold. The position of the rotor is detected as a function of the respective times. The integral reference threshold is established by fixing a peak value, applying to the windings a calibration pulse, detecting the corresponding response signal and determining the time taken to reach the peak value. The integral reference threshold is selected as the integral of the response signal.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: November 24, 2020
    Assignee: STMICROELECTRONICS S.R.L.
    Inventor: Michele Boscolo Berto
  • Patent number: 10658962
    Abstract: The present invention discloses a method for determining a rotor angle of a rotor of an electric machine, having the steps of producing a torque-dependent test signal which depends on the torque of the electric machine and has a higher frequency than a supply signal for the electric machine, controlling the electric machine using the supply signal and the test signal which is superimposed on the supply signal, recording phase currents of the electric machine, and determining the rotor angle of the rotor of the electric machine on the basis of the effects of the test signal on the phase currents. The present invention also discloses an angle determination apparatus and a corresponding control apparatus.
    Type: Grant
    Filed: December 21, 2016
    Date of Patent: May 19, 2020
    Assignee: Robert Bosch GmbH
    Inventors: Gunther Goetting, Lei Chen
  • Patent number: 10581369
    Abstract: A motor controller according to the present disclosure obtains the rotational speed determination signal of the motor through the microprocessor and the rotational speed collector, and then outputs the first control signal by the first logic operation circuit based on the speed of the motor, to make the driving circuit control the main circuit to work normally or enter the safety state. In addition, the motor controller generates and outputs the second shutoff signal by the monitoring chip based on the working state or the output instruction of the microprocessor, and then outputs the second control signal by the second logic operation circuit based on the second shutoff signal and whether the DC bus voltage of the main circuit is in an overvoltage state, to make the driving circuit control the main circuit to stop receiving the first control signal and enter the safety state.
    Type: Grant
    Filed: January 3, 2019
    Date of Patent: March 3, 2020
    Assignee: SUNGROW POWER SUPPLY CO., LTD.
    Inventors: Wenjie Chen, Enli Du, Anbo Yu, Han Yang
  • Patent number: 10469014
    Abstract: Provided is a control device for a permanent magnet-type rotating electrical machine (100), which includes a current coordinate transformation unit (109) configured to output a d-axis current and a q-axis current by coordinate transformation of three-phase AC currents respectively detected by current detection units (111, 112, 113), a current correction direction calculation unit (108) configured to calculate a current correction direction through use of the d-axis current and the q-axis current, and a current correction amount addition unit (102) configured to correct a d-axis current command and a q-axis current command based on the current correction direction. In this manner, an induced voltage is converged to lie within a maximum voltage circle in accordance with a power supply voltage.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: November 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kotaro Nakano, Noriyuki Wada, Daiki Matsuura, Hideaki Kawamoto, Hiroyuki Kobayashi
  • Patent number: 10277150
    Abstract: Method of driving a single-coil motor having a stator and a rotor and a coil, comprising the steps of: monitoring a position signal and determining when said signal passes a first threshold; b) providing control signals for energizing the coil; c) a predefined period later, providing control signals for stopping or reducing the energization of the coil; d) monitoring a second signal indicative of the coil current, and determining a third time when said signal passes a second threshold level; and monitoring the first signal, and determining a fourth time when said signal passes a third threshold level; e) updating the prediction period; f) repeating steps b) to e). A driver circuit adapted for performing such method. A system comprising such driver circuit.
    Type: Grant
    Filed: December 20, 2017
    Date of Patent: April 30, 2019
    Assignee: Melexis Bulgaria Ltd
    Inventors: Dirk Leman, Rumen Marinov Peev, Petko Nedelev
  • Patent number: 10199978
    Abstract: A multiphase driver device includes: one phase driver circuit of a first type including a first monitoring transistor and a first monitoring resistor generating a first voltage that is proportional to a first source current supplied to a one of the plurality of semiconductor switches; and a plurality of phase driver circuits of a second type each including a second monitoring transistor and a second monitoring resistor generating a second voltage that is proportional to that a second source current supplied to corresponding one of the remaining semiconductor switches, each of the plurality of phase driver circuits of the second type further including a comparator that compares the second voltage to the reference voltage, and a first regulating transistor that adds a first regulating current to the second source current in accordance with an output of the comparator.
    Type: Grant
    Filed: November 3, 2017
    Date of Patent: February 5, 2019
    Assignee: FUJI ELECTRIC CO., LTD.
    Inventor: Wataru Tomita
  • Patent number: 10161735
    Abstract: An apparatus for determining the position of the rotor of an electric machine in relation to the stator. The machine has multiple phases, each of which includes at least one pole winding with a magnetizable core. The apparatus includes devices for detecting measurement signals that are characterized by the momentary degrees of magnetization of the pole winding cores. The degrees of magnetization are influenced by the angular position of the magnetic field of the rotor. The devices are also used to detect the currents in the phases and determine the angular position of the rotor from the detected measurement signals, taking into account a contribution of the phase currents to the degrees of magnetization of the pole winding cores.
    Type: Grant
    Filed: November 23, 2011
    Date of Patent: December 25, 2018
    Inventor: Rolf Strothmann
  • Patent number: 10164558
    Abstract: An electric motor control device includes a control unit that controls operation of a drive circuit supplying electric power to an electric motor and a current sensor that detects current generated in the electric motor. The control unit detects fundamental high frequency current generated when the electric motor is applied with fundamental high frequency voltage for estimating the magnetic pole position, selects first electric angle and second electric angle corresponding to a d-axis direction of the magnetic pole position, detects first specific high frequency current generated when a position of the first electric angle is applied with specific high frequency voltage and second specific high frequency current generated when a position of the second electric angle is applied with the specific high frequency voltage, and compares the first and the second specific high frequency currents to estimate a positive d-axis direction of the magnetic pole position.
    Type: Grant
    Filed: June 23, 2016
    Date of Patent: December 25, 2018
    Assignee: DENSO CORPORATION
    Inventor: Koji Sakai
  • Patent number: 9667184
    Abstract: A device for determining a rotor position in a polyphase electric motor having a first phase, a second phase and a third phase. A power control unit applies a first voltage on the first phase, and a second voltage on the second phase, the first voltage and the second voltage being periodic signals of opposite polarity, alternating between a first part and a second part of the alternating period, such as square waves. A sample unit samples a third voltage on the third phase for acquiring a first sample at a first instant in the first part and a second sample at a second instant in the second part, and a difference value between the first sample and the second sample. The difference value represents a mutual inductance between the stator coils due to the rotor position. A determination unit determines the rotor position based on the difference value.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: May 30, 2017
    Assignee: NXP USA, Inc.
    Inventors: Ivan Lovas, Pavel Grasblum, Libor Prokop
  • Patent number: 9539903
    Abstract: External power supply system includes an electrical storage device, motor, inverter that drives the motor by using electric power of the electrical storage device, and a control device controls the inverter. The inverter includes a first and second switching elements connected in series with each other between a positive and negative electrode power supply lines. A connection-node of the first and second switching elements is connected to one corresponding stator coil. The control device inputs signals to the inverter to drive the inverter such that voltage at the neutral point becomes a predetermined value. The control device compensates for signals in dead time period, the period in which off-state signals are supplied to the first and second switching elements, on the basis of current that is input from the connection-node to one corresponding stator coil or output from one corresponding stator coil to the connection-node while an engine is driven.
    Type: Grant
    Filed: April 15, 2014
    Date of Patent: January 10, 2017
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Shigeki Kinomura, Shingo Ueda, Yoshitoshi Watanabe, Takaji Umeno
  • Patent number: 9531308
    Abstract: A fan having one fan blade; a fan motor for rotating the fan blade; a motor control electrically coupled with the fan motor for controlling operational characteristics of the fan motor; and a power supply having a step-down high efficiency buck converter, a step-down low drop-out linear regulator, and/or a step-down switching regulator are described. The power supply may receive a first input voltage and lower the first input voltage to a second lower voltage. The fan motor is electrically coupled to be driven by the first input voltage and the motor control is electrically coupled to operate using the second lower voltage from the power supply. The motor control may include a microcontroller, level shifters electrically coupled to the microcontroller, and drivers electrically coupled to the level shifters and configured to drive the fan motor.
    Type: Grant
    Filed: June 30, 2015
    Date of Patent: December 27, 2016
    Assignee: Nidec Motor Company
    Inventors: Gregory A. Peterson, Keith M. Kolmos, Carolyn S. Schaefer, Mile Bozic, David E. Lass, William J. Taylor
  • Patent number: 9374027
    Abstract: A rotor position determination and tracking system for a dynamo electric machine includes a first AC power supply to inject a carrier wave into a main stator of the dynamoelectric machine and a second AC power supply to inject an excitation voltage or current into an exciter stator of the dynamoelectric machine. A plurality of current sensors and voltage sensors located at the exciter input lines sense current and voltage thereat. A first control logic receives the sensed current and voltage and outputs an estimated rotor position. A second control logic receives an estimated exciter field voltage or current rotating wave form angle and filtered sensed current or voltage signals from the first control logic and utilizes a known main stator carrier frequency to determine the rotor position. The rotor position is input into the first control logic to calibrate the first control logic for tracking of the true rotor position.
    Type: Grant
    Filed: January 30, 2012
    Date of Patent: June 21, 2016
    Assignee: HAMILTON SUNDSTRAND CORPORATION
    Inventor: Albert L. Markunas
  • Patent number: 9077275
    Abstract: A rotor position estimating device includes a voltage application unit, a current detecting unit and an estimating unit. The voltage application unit is configured to apply a d-axis voltage to an electric motor including a salient-pole rotor during a stop of the electric motor. The current detecting unit is configured to detect a q-axis current flowing through the electric motor at the time when the d-axis voltage is applied. The estimating unit is configured to estimate a rotor position during a stop of the electric motor on the basis of the q-axis current detected by the current detecting unit. The voltage application unit is configured to set a voltage application time in correspondence with peak timing at which the q-axis current reaches a peak in a transitional response characteristic of the q-axis current at the time when the d-axis voltage is applied.
    Type: Grant
    Filed: August 6, 2013
    Date of Patent: July 7, 2015
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hichirosai Oyobe, Takuya Nishimoto, Hiroyuki Oyanagi
  • Patent number: 9024561
    Abstract: The system and method disclose for the controlling of motor switching. The system includes a controller unit having a control signal generator, a memory device, a processing unit, a signal acquisition device, and an analog-to-digital converter. A power stage has a plurality of switches and receives a control signal from the control signal generator and a power signal from a power source. The power stage drives two windings of the set of three stator windings with a multi-state pulse and leaves one stator of the three stator windings undriven. The processing unit acquires a demodulated measured voltage on the undriven winding. The processing unit communicates with the power stage to change which two windings of the three stator windings are driven when the demodulated measured voltage surpasses a threshold.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: May 5, 2015
    Assignee: Cirrus Logics, Inc.
    Inventors: Jason William Lawrence, Marc John Kobayashi, John L. Melanson, Miroslav Olijaca
  • Patent number: 8994306
    Abstract: The system and method disclose for the controlling of sequential phase switching in driving a set of stator windings of a multi-phase sensorless brushless permanent magnet DC motor. A motor controller controls a power stage that drives two windings of a set of three windings in the motor with pulse width modulated signal. A plurality of voltage values on an undriven winding of the set of three windings are sampled within a window of time, wherein a period beginning when the driven windings are energized and ending when the driven windings are de-energized encompasses the window of time. The sampled voltage values are processed. When the processed voltage values exceed a threshold, the motor controller changes which two windings are driven.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 31, 2015
    Assignee: Cirrus Logic, Inc.
    Inventors: Marc John Kobayashi, Jason William Lawrence, Stephen James Sanchez, John L. Melanson, Miroslav Olijaca
  • Patent number: 8988027
    Abstract: A motor control apparatus according to the embodiment includes a rotational position estimating unit, a change amount estimating unit, and an inductance estimating unit. The rotational position estimating unit estimates a rotational position of a rotor from a motor parameter including a q-axis inductance of a motor on a basis of an output current to the motor and a voltage reference. The change amount estimating unit estimates a change amount of an output torque with respect to a current phase change of the motor corresponding to a high frequency signal whose frequency is higher than a drive frequency of the motor. The inductance estimating unit estimates an inductance value that obtains a maximum torque on a basis of the change amount as the q-axis inductance.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: March 24, 2015
    Assignee: Kabushiki Kaisha Yaskawa Denki
    Inventors: Shingo Fukumaru, Shinya Morimoto, Hideaki Iura, Akira Yamazaki
  • Patent number: 8975848
    Abstract: Methods and systems for starting an electric motor using a motor controller including a processor are provided. The method includes determining if the electric motor is operating, increasing a failed start counter if the electric motor is determined not to be operating, determining a reverse rotation by comparing a failed start counter to a predetermined threshold, and applying a reverse rotation start routine to the electric motor when a reverse rotation is determined.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: March 10, 2015
    Assignee: Regal Beloit America, Inc.
    Inventors: Ludovic Andre Chretien, Brian L. Beifus
  • Patent number: 8970150
    Abstract: An apparatus detects the position of a rotor of an electric motor having three phases and a plurality of windings. The apparatus includes circuitry configured to connect at least two of said windings between first and second reference voltages according to a first current path disconnect said at least two windings, and allow the current stored in said two windings to be discharged through a second current path. The apparatus comprises a measuring circuit configured to measure the time period between the starting instant of storing the current in the two windings and the final instant of discharging the two windings and a rotor detector configured to detect the rotor position based at least in part on the measured time period.
    Type: Grant
    Filed: September 23, 2011
    Date of Patent: March 3, 2015
    Assignee: STMicroelectronics S.r.l.
    Inventor: Michele Berto Boscolo
  • Publication number: 20150054441
    Abstract: A method for determining the position of an at least two-phase, in particular three-phase bmshless electric drive comprising at least two phase windings, each of which has a first and a second terminal, a second terminal of a first phase winding being electrically connected to the first terminal of a second phase winding at a common connecting terminal. In order to be able to reliably determine the position of the electric drive even at low speeds, a voltage pulse is applied between the first terminal of the first phase winding and the second terminal of the second phase winding, the resulting voltage at the connecting terminal or at a third phase winding connected thereto is detected and the voltage ratio between the first phase winding and the second phase winding is determined therefrom, and the ratio between the variable inductances is determined from said voltage ratio.
    Type: Application
    Filed: November 3, 2014
    Publication date: February 26, 2015
    Inventor: Johannes SCHWARZKOPF
  • Publication number: 20150042249
    Abstract: An estimating method for a rotor position of a motor and an estimating device for the same are disclosed herein. The estimating method includes injecting a first high frequency signal to the motor at a first estimating angle, generating a first sensing signal of the motor in a period when the first high frequency signal is injected to the motor, injecting a second high frequency signal to the motor at a second estimating angle, generating a second sensing signal of the motor in a period when the second high frequency signal is injected to the motor, determining a quadrant of an operating angle according to the first sensing signal and the second sensing signal, and acquiring the rotor position according to the first sensing signal, the second sensing signal, and the quadrant of the operating angle.
    Type: Application
    Filed: January 21, 2014
    Publication date: February 12, 2015
    Applicant: DELTA ELECTRONICS, INC.
    Inventor: Yi-Cherng LIN
  • Patent number: 8947036
    Abstract: To provide a parallel drive system that can reduce vibrations of an arm member and can realize positioning at a high speed even when a slave servomotor does not have a position detector, at a low cost. To achieve this object, a parallel drive system of the invention includes: a master servomotor and a slave servomotor that include linearly-moving movable units that are arranged in parallel to each other, respectively; and an arm member that forms a bridge between the two movable units. The system includes: a position detector detecting position information on the movable unit of the master servomotor; an acceleration sensor detecting acceleration information on the movable unit of the slave servomotor; a master servo amplifier controlling the master servomotor based on the position information; and a slave servo amplifier controlling the slave servomotor based on the position information and the acceleration information.
    Type: Grant
    Filed: February 17, 2010
    Date of Patent: February 3, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shigeo Amigasaya, Hiroyuki Sekiguchi, Hidetoshi Ikeda
  • Patent number: 8941341
    Abstract: A brushless wound field synchronous generator configured to generate an output power to drive an electrical load includes a rotating rectifier assembly. The rotating rectifier assembly includes a rotating diode assembly and a field effect transistor (FET) to control voltage across the rotating diode assembly.
    Type: Grant
    Filed: March 14, 2013
    Date of Patent: January 27, 2015
    Assignee: Hamilton Sundstrand Corporation
    Inventors: Gregory I. Rozman, Jacek F. Gieras, Steven J. Moss
  • Patent number: 8941339
    Abstract: An apparatus for measuring a position deviation of a rotor of a permanent magnet synchronous motor includes a control unit, a power transformation unit, a rotor position estimator and a calculation unit. The control unit receives a d-axis DC voltage signal and a q-axis AC voltage signal and receives an initial value of the rotor position and a high-frequency signal to output a three-phase command signal. The power transformation unit receives the three-phase command signal and outputs a three-phase control signal for controlling the motor. The rotor position estimator receives a three-phase current feedback signal corresponding to an operation of the motor and generates an estimation value of the rotor position. The calculation unit performs calculation to the initial value and the estimation value to generate a deviation value of the rotor position. Moreover, a method for measuring the position deviation is also disclosed herein.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: January 27, 2015
    Assignee: Delta Electronics, Inc.
    Inventors: Jia-Min Zhang, Jin-Geng Li
  • Patent number: 8928265
    Abstract: An apparatus includes a sensorless field-oriented control (FOC) motor controller. The motor controller includes a pulse width modulation (PWM) controller configured to generate PWM signals and to provide the PWM signals to an inverter. The motor controller also includes an angle sampler configured to receive a commanded voltage angle signal and to provide the commanded voltage angle signal as an output signal in response to a triggering event. The triggering event is based on a voltage or a current associated with an input or an output of the inverter. The motor controller further includes a first combiner configured to combine (i) a feed-forward voltage angle signal and (ii) a second signal based on the output signal. The first combiner is configured to generate the commanded voltage angle signal. In addition, the motor controller includes a second combiner configured to combine a feed-forward voltage amplitude signal and the second signal.
    Type: Grant
    Filed: August 13, 2012
    Date of Patent: January 6, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Ling Qin, Terry L. Mayhugh, Jr., Swaminathan Kumar Ramanathan
  • Patent number: 8912743
    Abstract: An example apparatus includes a controller configured to control operation of a salient-type, multiphase motor in accordance with a technique including periodic on and off-times, the motor including a stator and a rotor. The controller is configured to calculate or receive values representing changes in current to the motor during the respective on and off-times or measurements proportional thereto, and calculate an inductance of the motor as a function of the values and a supply voltage to the motor. And the controller is configured to determine a position of the rotor based on the inductance of the motor, and control operation of the motor based on the position of the rotor.
    Type: Grant
    Filed: November 1, 2011
    Date of Patent: December 16, 2014
    Assignee: Simmonds Precision Products, Inc.
    Inventor: Scott Robert Durkee
  • Patent number: 8907606
    Abstract: A method for determining a rotor position of a two-phase synchronous machine including two strands. The method is useful for electronically commuting the synchronous machine. The method includes alternately actuating each of the strands in a first actuating time window with an actuating value of positive polarity and in a second actuating time window with an actuating value of negative polarity, where the first and the second actuating time window alternately follow each other. The method further includes applying an actuating value of 0 during a measuring time window which is provided within at least one of the actuating time windows of a strand. The method further includes applying a measuring pulse to the corresponding strand within the measuring time window in order to measure the inductance of the corresponding strand as an indication of the rotor position. In general, the strand inductance is dependent on the rotor position.
    Type: Grant
    Filed: July 15, 2010
    Date of Patent: December 9, 2014
    Assignee: Robert Bosch GmbH
    Inventor: Torsten Wilharm
  • Patent number: 8901867
    Abstract: A method of controlling an electrical machine. The electrical machine includes a stator having a core and a plurality of windings, and a rotor disposed adjacent to the stator to interact with the stator. The method includes detecting a movement of the rotor, generating a three phase alternating current (AC) voltage signal by all phases of the electrical machine, monitoring for a transfer speed of the electrical machine, discontinuing the three phase AC voltage signal when the transfer speed is traversed, and switching to a back electromotive force (BEMF) control mode after discontinuing the three phase AC voltage signal.
    Type: Grant
    Filed: April 28, 2011
    Date of Patent: December 2, 2014
    Assignee: Regal Beloit America, Inc.
    Inventor: Paul Mullin
  • Patent number: 8901868
    Abstract: In one embodiment, a method includes measuring between two consecutive electrical commutations of a brushless direct-current (BLDC) motor a current through the BLDC motor. One or more pulse-width-modulation (PWM)-configurable signals are driving the BLDC motor. The method includes determining a waveform of the current through the BLDC motor; if the waveform of the current through the BLDC motor comprises a first type, then increasing a duty cycle of each of one or more of the PWM-configurable signals driving the BLDC motor; and, if the waveform of the current through the BLDC motor comprises a second type, then decreasing a time interval between electrical communications of the BLDC motor.
    Type: Grant
    Filed: May 18, 2011
    Date of Patent: December 2, 2014
    Assignee: Atmel Corporation
    Inventor: Markus Ekler
  • Publication number: 20140346984
    Abstract: A controlling apparatus for an electric motor according to an embodiment includes a superposed component generator, an inverter, a current detector, and a magnetic pole position estimator. The superposed component generator generates, at a predetermined cycle, a superposed voltage reference of which vector is shifted by 90 degrees with respect to that of a superposed voltage reference previously generated, in a coordinate system that is set to a stator of the electric motor. The inverter outputs a driving voltage that is based on a driving voltage reference superposed with the superposed voltage reference to the electric motor. The current detector detects currents flowing into respective phases of the electric motor, and outputs the detected currents. The magnetic pole position estimator detects the magnetic pole position of the electric motor based on an amount of change in the detected currents at the predetermined cycle.
    Type: Application
    Filed: August 11, 2014
    Publication date: November 27, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Takayuki SHIOTA, Shinya MORIMOTO, Hideaki IURA
  • Patent number: 8896259
    Abstract: A frequency converter and a method for determining the position of the rotor of an electric machine are provided. The frequency converter includes a load bridge and a control of the load bridge, for supplying electricity between the load bridge and an electric machine connected to the load bridge. The frequency converter includes a determination for at least one electrical parameter of the electric machine, and includes a determination for the position of the rotor of the electric machine. The load bridge is fitted to supply a first alternating electricity excitation signal, which is formed in relation to the electrical angle of the electric machine, to the electric machine. The frequency converter is further fitted to determine the first alternating electricity response signal corresponding to the first alternating electricity excitation signal, and the position of the rotor is determined on the basis of the first alternating electricity response signal.
    Type: Grant
    Filed: July 11, 2012
    Date of Patent: November 25, 2014
    Assignee: Kone Corporation
    Inventors: Tuukka Kauppinen, Lauri Stolt
  • Patent number: 8884564
    Abstract: A voltage converter includes a first circuit and a second circuit. The first circuit includes two or more reactors and at least one switching element. One terminal of each of the reactors is connected in parallel with respect to a power source. The at least one switching element is connected to the other terminal of each of the reactors. The second circuit includes at least one rectifier of which one terminal is connected to the electrical load. The second circuit shares with the first circuit the at least one switching element connected to the at least one rectifier. The first circuit is connected such that the power source charges the respective reactors when the at least one switching element is turned ON. The second circuit is connected such that the reactors discharge power to the electrical load when the at least one switching element is turned OFF.
    Type: Grant
    Filed: March 9, 2012
    Date of Patent: November 11, 2014
    Assignee: Denso Corporation
    Inventors: Takeshi Itoh, Hirofumi Kako
  • Patent number: 8884566
    Abstract: A position sensorless control methodology for electrical machines using high frequency flux vector signal injection in the estimated rotor flux rotational reference frame is provided. In one aspect, the estimated position error function is derived directly from the stator flux equation without any simplification. The method is applicable for electrical generator motoring mode operation from standstill and power generation mode operation.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: November 11, 2014
    Assignee: Vestas Wind Systems A/S
    Inventors: Shu Yu Cao, Bing Li, Anshuman Tripathi, Lars Helle
  • Patent number: 8878480
    Abstract: In sequentially selecting and driving two phases of the three-phase stator windings of a synchronous motor, detect a speed electromotive voltage of a de-energized phase, relate the speed electromotive voltage to rotor position information beforehand, then count rotor position information backward based on the detected the speed electromotive voltage to estimate rotor position; and then detect rotation speed from the change rate of the rotor position information so as to achieve highly accurate position and speed control.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: November 4, 2014
    Assignee: Hitachi Automotive Systems, Ltd.
    Inventors: Yoshitaka Iwaji, Shigehisa Aoyagi, Kazuaki Tobari, Ryoichi Takahata, Masaki Hano
  • Patent number: 8860342
    Abstract: A system. The system includes a processor, a first module, a second module and a third module. The first module is communicably connected to the processor and is configured for calculating a q-axis voltage component and a d-axis voltage component. The second module is communicably connected to the processor and is configured for determining a voltage angle relative to the q-axis. The third module is communicably connected to the processor and is configured for (1) comparing the determined voltage angle to a predetermined value, (2) outputting the determined voltage angle if the determined voltage angle is less than the predetermined value, and (3) outputting the predetermined value if the predetermined value is less than the determined voltage angle.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: October 14, 2014
    Assignee: Curtiss-Wright Electro-Mechanical Corporation
    Inventors: Mark P. Krefta, Kalyan K. Sen
  • Publication number: 20140292237
    Abstract: A motor control apparatus according to an embodiment includes a power conversion unit and a control unit. The power conversion unit supplies power to a motor having salient pole characteristic. The control unit performs proportional-integral control on the deviation between a current reference and a current flowing into the motor to generate a voltage reference, and controls the power conversion unit on the basis of the voltage reference. The control unit estimates the magnetic-pole position of a rotor of the motor on the basis of a high-frequency current flowing into the motor by controlling the power conversion unit, and corrects the estimated magnetic-pole position on the basis of an integrated value of the proportional-integral control.
    Type: Application
    Filed: January 16, 2014
    Publication date: October 2, 2014
    Applicant: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira YAMAZAKI, Hirofumi KINOMURA, Hideaki IURA
  • Publication number: 20140292244
    Abstract: A control apparatus is provided for controlling a multi-phase, switched reluctance motor. The control apparatus includes voltage adjusters, a controller, and a carrier signal generator. Each of the voltage adjusters adjusts a voltage applied to a corresponding one of voltage application targets on the same salient pole of a stator of the motor. The controller controls each of the voltage adjusters via a pulse-width modulation based on comparison between a command signal and a corresponding one of carrier signals, thereby controlling the voltage applied to the corresponding voltage application target to a command voltage indicated by the command signal. The carrier signal generator generates the carrier signals so that for at least one pair of the voltage application targets on the same salient pole of the stator, two of the carrier signals which respectively correspond to the pair of the voltage application targets are offset in phase from each other.
    Type: Application
    Filed: March 28, 2014
    Publication date: October 2, 2014
    Applicant: DENSO CORPORATION
    Inventor: Yoshinobu KAMADA
  • Patent number: 8836253
    Abstract: A control apparatus for an AC rotary machine includes: a current detection section detecting current from a power converter to the AC rotary machine; and a control section generating a three-phase AC voltage instruction to the power converter, based on current detected by the current detection section and a torque instruction. The control section includes: an observer calculating a magnetic flux estimated value of the AC rotary machine, based on detected current and the voltage instruction; a current instruction calculation unit calculating current instruction values on rotational two axes, based on the torque instruction and the magnetic flux estimated value from the observer; and a voltage instruction calculation unit calculating the voltage instruction, based on the current instruction values from the current instruction calculation unit and the magnetic flux estimated value from the observer.
    Type: Grant
    Filed: March 25, 2011
    Date of Patent: September 16, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Sho Kato, Hisanori Yamasaki, Keita Hatanaka, Hidetoshi Kitanaka, Yoshinori Yamashita
  • Patent number: 8829837
    Abstract: A driving apparatus for an electromagnetic load, said apparatus having at least one pair of first and second transistors arranged so as to form a current path with the electromagnetic load for discharging the current produced by the electromagnetic load. The first transistor has an inherent diode between the non-drivable terminals and the apparatus is configured to control switching of the pair of first and second transistors, to diode-connect the second transistor, with said first and second transistors switched off, so that the current produced by said electromagnetic load, crossing said inherent diode, creates an overvoltage between the terminals of the second diode-configured transistor such to exceed the conduction threshold voltage thereof.
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: September 9, 2014
    Assignee: STMicroelectronics S.r.l.
    Inventor: Ezio Galbiati
  • Publication number: 20140232311
    Abstract: To establish an initial/resting position of a permanent magnet rotor, all motor stator windings are stimulated (voltage applied thereto) in sequence, the time it takes for current in the stimulated stator winding to rise to a specific current value is measured for each stator winding and these time measurement results processed. From the measured time results rotor position to within 60 degrees is determined and the position sector is known prior to starting/rotating the motor. Once the rotor position is known, the next commutation point in a six step sequence is known before actually starting/rotating the motor. Position measurement winding stimulation may be interleaved with commutation pulses, or the unexcited stator winding may be stimulated between commutation pulses to the other two excited stator, wherein one of the two stator windings remains connected to the power and provides a current return path to the unexcited but stimulated stator winding.
    Type: Application
    Filed: February 19, 2014
    Publication date: August 21, 2014
    Inventor: Martin Hill
  • Publication number: 20140225548
    Abstract: At least one example embodiment discloses a drive system including a motor including a rotor, the motor configured to receive a measured current, a controller configured to generate a voltage for the motor at a stationary reference frame, the voltage having a frequency and the measured current being based on the voltage, a filter configured to obtain position information of the rotor based on the measured current and a nonlinear observer configured to estimate a rotor position of the motor during the stationary reference frame based on the position information. The controller is configured to control the motor based at least in part on the estimated rotor position.
    Type: Application
    Filed: March 14, 2013
    Publication date: August 14, 2014
    Applicant: Deere & Company
    Inventors: Wei XU, Robert SHAW, Jiyao WANG
  • Patent number: 8786230
    Abstract: A method of estimating inductance of a permanent magnet synchronous motor (PMSM) includes injecting a signal having a frequency differing from an operating frequency of the PMSM into the PMSM during sensorless operation, sensing magnitudes of current responses to the injected signal, and estimating an inductance value at which the magnitude of the sensed current response is minimal to be an actual inductance value of the PMSM, thereby estimating inductance used in the PMSM regardless of position estimation error of the PMSM and thus more accurately and reliably estimating inductance of the PMSM.
    Type: Grant
    Filed: August 4, 2011
    Date of Patent: July 22, 2014
    Assignees: Samsung Electronics Co., Ltd., SNU R&DB Foundation
    Inventors: Dong Hwan Lee, Young Jae Park, Yong Soon Park, Seung Ki Sul
  • Publication number: 20140184120
    Abstract: The invention relates to an apparatus for estimating angles in a synchronous machine (11), having an angle sensor device (15) which is designed to determine event-discrete measured values for a rotor angle (?) of a rotor of the synchronous machine (11) and to output a measurement signal dependent on the determined measured values, an estimation device (16) which is designed to record current and/or voltage signals from the synchronous machine (11), to calculate a deviation (??) of the rotor angle (?) of the rotor of the synchronous machine (11) from an expected rotor angle on the basis of the recorded current and/or voltage signals and to output a deviation signal dependent on the calculated deviation (??), and a combining device (17) which is designed to receive the measurement signal and the deviation signal and to calculate an estimated value ({circumflex over (?)}) for the rotor angle (?) of the rotor of the synchronous machine (11) from a combination of the measurement signal and the deviation signal.
    Type: Application
    Filed: April 5, 2012
    Publication date: July 3, 2014
    Applicant: ROBERT BOSCH GMBH
    Inventors: Christian Lingenfelser, Eckart Mayer-John, Gunther Goetting
  • Publication number: 20140145659
    Abstract: A method for determining the rotary position of the rotor of an electric machine, which includes star-connected phase conductors, wherein a measurement signal representing the rotary position of the rotor within a magnetic half-period is determined from the potential at the star point. At a measurement time a specified voltage is applied to the ends of all the phase conductors by forcing the star point to a specific potential. At a time following the measurement time a voltage that deviates from the specified voltage is applied to the ends of one of the phase conductors. Then the measurement signal is derived from the current that develops from the measurement time in a connection of the star point to the specified potential.
    Type: Application
    Filed: April 13, 2012
    Publication date: May 29, 2014
    Inventor: Rolf Strothmann
  • Publication number: 20140145660
    Abstract: A rotating electrical machine control device that applies a high frequency current to a rotating electrical machine including a rotor having saliency, estimates a magnetic pole direction of the rotor on the basis of a high frequency component contained in a voltage command as a response component to the high frequency current, and controls the rotating electrical machine. A high frequency superimposing section sets an estimated d-q axis rotating coordinate system, and a magnetic pole direction adjusting section sets a high frequency coordinate system having a phase difference of the high frequency current command with respect to the estimated d-q axis rotating coordinate system. A steady estimation error correcting section calculates a magnetic flux interference estimation error as an error of the estimated value of the magnetic pole direction which is caused by the d-q axis magnetic flux interference.
    Type: Application
    Filed: October 17, 2012
    Publication date: May 29, 2014
    Applicant: Aisin AW Co., Ltd.
    Inventors: Arinori Shimada, Subrata Saha
  • Patent number: 8736210
    Abstract: Speed of a motor, generator or alternator, more particularly the speed of an alternating current (AC) induction motor is determined. Problems associated with previous devices are overcome by providing a speed monitoring device that is readily retrofitted to an existing motor. A test signal is superimposed onto an input voltage, which voltage in use is applied to at least one winding of the stator of a motor (the test signal is at a frequency substantially equal to the rotor frequency). The test signal frequency is varied so that it varies from a minimum frequency to a maximum frequency. A current monitor monitors a resultant current, in the at least one stator winding. and deriving from the resultant current is a signal indicative of the rotor frequency.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: May 27, 2014
    Inventor: Raymond John Peto
  • Publication number: 20140117901
    Abstract: A method of estimating an initial rotor position of a switched reluctance (SR) machine having a rotor and a stator is provided. The method may comprise the steps of driving a phase current in each of a plurality of phases of the SR machine to a predefined limit, performing an integration of a common bus voltage associated with each phase, determining a flux value for each phase based on the integrations, and determining the initial rotor position based on the flux values.
    Type: Application
    Filed: October 31, 2012
    Publication date: May 1, 2014
    Applicant: CATERPILLAR INC.
    Inventors: Jesse Gerdes, Jackson Wai, Mark Hartman, Ahmed Khalil, Carlos Nino Baron