Frequency Control Patents (Class 318/807)
  • Patent number: 10523144
    Abstract: One example is a system for controlling a motor during startup. The system includes measurement logic, pattern detection logic, and mode logic. The measurement logic monitors a back-electromotive force (BEMF) signal representing a BEMF of an electric motor and the pattern detection logic monitors this signal to detect instances of the monitored BEMF signal exhibiting a predetermined pattern. The mode logic enables control of the electric motor according to a plurality of modes of control. In some examples, the mode logic initially employs a first mode of control and switches from the first mode of control to a second mode of control in response to the pattern detection logic detecting that a BEMF signal exhibits the predetermined pattern over a plurality of commutation states.
    Type: Grant
    Filed: June 15, 2018
    Date of Patent: December 31, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventor: Kristen N. Mogensen
  • Patent number: 10502203
    Abstract: A pumping system for an aquatic application includes a motor to be coupled to a pump and a controller in communication with the motor. The controller is configured to determine a speed of the motor, determine a current performance value of the pumping system, compare the current performance value to a referenced performance value, determine an adjustment value based upon the comparison of the reference and current performance values, and adjust a speed of the motor based on the adjustment value.
    Type: Grant
    Filed: February 5, 2016
    Date of Patent: December 10, 2019
    Assignees: Pentair Water Pool and Spa, Inc., Danfoss Power Electronics A/S
    Inventors: Robert W. Stiles, Jr., Lars Hoffmann Berthelsen, Ronald B. Robol, Christopher Yahnker, Daniel J. Hruby, Kevin Murphy, Einar Kjartan Runarsson, Arne Fink Hansen, Florin Lungeanu, Peter Westermann-Rasmussen
  • Patent number: 10495340
    Abstract: Disclosed are an inverter circuit, and air conditioner and refrigerator using the same. The inverter circuit includes a rectifier configured to rectify an input Alternating-Current (AC) voltage into a Direct-Current (DC) voltage; a smoothing portion configured to smoothen the DC voltage output from the rectifier; an inverter connected to a load, and configured to convert the DC voltage smoothened by the smoothing portion into an AC voltage, and to output the AC voltage to the load; and a suppressor installed between the rectifier and the smoothing portion, and configured to suppress an overvoltage or overcurrent of a DC link to which the DC voltage from the smoothing portion is applied.
    Type: Grant
    Filed: June 12, 2015
    Date of Patent: December 3, 2019
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Tatsuhisa Shimura, Shokichi Sugiyama
  • Patent number: 10483892
    Abstract: A variable magnetization machine control system comprising a controller configured to adjust a d-axis current waveform and a q-axis current waveform in accordance with an operating condition of a variable magnetization machine to generate an adjusted d-axis current waveform and an adjusted q-axis current waveform that provide a driving voltage to drive the variable magnetization machine at a predetermined speed while maintaining the driving voltage below a predetermined maximum magnitude.
    Type: Grant
    Filed: August 29, 2014
    Date of Patent: November 19, 2019
    Assignees: Nissan Motor Co., Ltd., Wisconsin Alumni Research Foundation
    Inventors: Takashi Fukushige, Takashi Kato, Brent S. Gagas, Robert D. Lorenz
  • Patent number: 10381920
    Abstract: The present invention provides a power limiting circuit for inverter device and an inverter device, which pertains to the technical field of power source inverting. The inverter device comprises a first logic judging circuit for comparing an input current of an inverter circuit with a first preset current threshold and outputting a first signal when said input current is larger than the first preset current threshold; and a shunt circuit for shunting a portion of the input current of the inverter circuit when receiving said first signal; wherein, the shunt circuit comprises a shunt resistance and a first controllable switch, the shunt resistance and the first controllable switch are connected in series and then parallel-connected to input ends of the inverter circuit, a control end of the first controllable switch is connected to an output end of the first logic judging circuit for controlling the first controllable switch to be connected when receiving said first signal.
    Type: Grant
    Filed: December 26, 2016
    Date of Patent: August 13, 2019
    Assignee: SHANGHAI SUNSON ACTIVATED CARBON TECHNOLOGY CO., LTD
    Inventor: Jun Xie
  • Patent number: 10312840
    Abstract: The invention relates to a control circuit for a synchronous machine (1) of a dental handpiece, comprising a voltage supply (2) and a clamping circuit (7) connected by switches (6). The invention also relates to a method for determining an angular position of a rotor of a synchronous machine (1), wherein a power supply is switched off for a total period of time (T2), a clamping circuit (7) is connected for a time interval (T1), whereupon an electromotive force is measured, and the angular position is determined from the electromotive force.
    Type: Grant
    Filed: February 16, 2015
    Date of Patent: June 4, 2019
    Assignee: DENTSPLY SIRONA Inc.
    Inventors: Hans-Walter Altendorf, Volker Hill
  • Patent number: 10293804
    Abstract: A vehicle propulsion system includes an engine and a first electric machine each configured to selectively provide torque to propel the vehicle. The propulsion system also includes a second electric machine coupled to the engine and configured to start the engine from an inactive state. A high-voltage battery powers both of the first electric machine and the second electric machine over a high-voltage bus. The vehicle further includes a controller programmed to issue a command to start the engine using the second electric machine in response to a threshold acceleration demand following a period of reduced acceleration demand.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: May 21, 2019
    Assignee: GM Global Technology Operations LLC
    Inventors: Chandra S. Namuduri, Lei Hao, Suresh Gopalakrishnan, Thomas W. Nehl
  • Patent number: 10281185
    Abstract: The invention includes an inverter to convert a direct-current voltage from a direct-current power supply into an alternating-current voltage and apply the alternating-current voltage to a motor that, a direct-current-voltage detecting unit to detect a voltage in the direct-current power supply, a current detecting unit to detect an electric current flowing to the inverter, and an inverter control unit to generate PWM signals for driving switching elements of the inverter based on the detected voltage the detected electric current, to set a specific phase difference between a phase of a carrier signal used for generation of the PWM signals and a phase of the alternating-current voltage, and to control the inverter such that a frequency of the PWM signals are synchronized with a frequency of the alternating-current voltage, the frequency of the PWM signals being an integer multiple of three times the frequency of the alternating-current voltage.
    Type: Grant
    Filed: August 28, 2015
    Date of Patent: May 7, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keisuke Uemura, Kazunori Hatakeyama, Yosuke Shinomoto, Koichi Arisawa
  • Patent number: 10277143
    Abstract: The present disclosure relates to an inverter provided in a hoist system, which includes a scale unit configured to control a size of a DC link voltage of the inverter, a proportional-integral (PI) controller configured to perform PI-control on an output of the scale unit and an output voltage of the inverter and outputting a control signal, a first calculating unit configured to sum a command frequency of the inverter and the control signal, and a voltage determining unit configured to determine an output voltage of the inverter from an output frequency of the first calculating unit.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: April 30, 2019
    Assignee: LSIS CO., LTD.
    Inventors: Eun-Woo Lee, Jung-Han Kim
  • Patent number: 10263505
    Abstract: A rectifier device which is used for a motor vehicle. Such a device includes a switching unit, which is connected to an intermediate circuit and can be operated with a predetermined switching frequency and provided with a plurality of filter elements connected in an intermediate circuit. Each is equipped with an inter intermediate circuit capacitance. A minimum of the magnitude frequency response of a respective filter element is within a different frequency interval, which has a harmonic of the switching frequency as a middle frequency and an interval length corresponding to the switching frequency as a respective minimum of the magnitude frequency response.
    Type: Grant
    Filed: November 16, 2017
    Date of Patent: April 16, 2019
    Assignee: AUDI AG
    Inventors: Maximilian Schiedermeier, Cornelius Rettner
  • Patent number: 10250174
    Abstract: A motor driving device for a motor having a stator and a rotor rotationally driven by an input of an AC voltage includes: an inverter circuit having multiple units corresponding to multiple phases respectively, each unit having a pair of a switching element and a reflux diode connected in anti-parallel to the switching element; and a control device controlling the inverter circuit to convert a DC voltage into the AC voltage and to output the AC voltage to the stator coil. The control device includes: a field weakening control unit adjusting the AC voltage to control a magnetic field of the stator coil to weaken a field magnetic flux of the rotor; and a regenerative current control unit switching an anti-regenerative side switching element to flow a regenerative current when the AC voltage stops while the field weakening control unit performs the field weakening control.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: April 2, 2019
    Assignee: DENSO CORPORATION
    Inventors: Koji Sakai, Akitomo Yamanaka
  • Patent number: 10236811
    Abstract: A method of realizing single direction chaotic rotation speed of permanent magnet synchronous motor is provided powered by a three-phase full-bridge inverter.
    Type: Grant
    Filed: February 4, 2016
    Date of Patent: March 19, 2019
    Assignee: XI'AN UNIVERSITY OF TECHNOLOGY
    Inventor: Hai-Peng Ren
  • Patent number: 10203141
    Abstract: A control system for a multi-stage compressor. The control system includes an AC line voltage source, a variable-voltage variable-frequency drive, and a processor. The AC line voltage source is configured to operate the multi-stage compressor. The variable-voltage variable-frequency drive is coupled to the AC line voltage source and is configured to operate the multi-stage compressor at a variable speed. The processor is coupled to the AC line voltage source and the variable-voltage variable-frequency drive, and is configured to alternatively coupled the AC line voltage source and the variable-voltage variable-frequency drive to the multi-stage compressor to operate the multi-stage compressor. The processor is further configured to transmit a capacity control signal to the multi-stage compressor. The capacity control signal is instructive to operate the multi-stage compressor in one of a high-capacity setting and a low-capacity setting.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: February 12, 2019
    Assignee: Regal Beloit America, Inc.
    Inventors: Ludovic Andre Chretien, Norman C. Golm, Jr.
  • Patent number: 10181811
    Abstract: To regulate the electrical output of a generator, a signal is received indicative of at least one characteristic of the electrical output. A first, relatively fast-response sub-controller is configured to provide a first control signal on the basis of the at least one characteristic and a second, relatively slow-response sub-controller is configured to provide a second control signal on the basis of the at least one characteristic. An output provides a combined control signal to adjust the electrical output based on the first and second control signals.
    Type: Grant
    Filed: August 15, 2014
    Date of Patent: January 15, 2019
    Assignee: BDR Thermea Group B.V.
    Inventors: Adam Henry Green, Angel Torres-Perez, Mícheál Gerard McArdle
  • Patent number: 10148211
    Abstract: A machine learning apparatus includes: a state observation unit that observes a state variable including an error between a position command and an actual position of a rotor, temperature of a motor driving apparatus and the motor, and voltage of each part of the motor driving apparatus; and a learning unit that learns a current feedback offset correction value for correcting an offset in the current feedback value, an inter-current-feedback-phase unbalance correction value for correcting an unbalance between phases in the current feedback value, and a current command correction value for a dead zone for correcting a current command in order to compensate a decreased amount of current due to a dead zone by which switching elements of upper and lower arms in the same phase of an inverter for motor power supply are not simultaneously turned on, in accordance with a training data set defined by the state variable.
    Type: Grant
    Filed: May 10, 2018
    Date of Patent: December 4, 2018
    Assignee: FANUC CORPORATION
    Inventors: Sou Saito, Taku Sasaki, Tsutomu Shikagawa
  • Patent number: 10135353
    Abstract: An AC-to-AC matrix converter includes a controlled rectifier input stage, an inverter output stage, and a regenerative unit. The controlled rectifier input stage is electrically connected to a power source and configured to convert AC input power from the power source into DC power. The controlled rectifier input stage may be unidirectional. The inverter output stage is electrically connected to a load and operates to convert the DC power into AC output power, which is then fed into the load. The regenerative unit is electrically connected to the inverter output stage and operates control energy generated by the load in a regenerative mode within the inverter output stage. The controlled rectifier input stage may be isolated from the inverter output stage in the regenerative mode.
    Type: Grant
    Filed: January 30, 2015
    Date of Patent: November 20, 2018
    Assignee: Eaton Intelligent Power Limited
    Inventor: Sayeed Ahmad Mir
  • Patent number: 10116235
    Abstract: A modulation processing unit performs a down-shift process or an up-shift process. In the down-shift process, a neutral-point voltage is shifted towards a low voltage side such that a smallest phase voltage command value is a lower fixed value that is a first lower limit value or a second lower limit value. In the up-shift process, the neutral-point voltage is shifted towards a high voltage side such that a largest phase voltage command value is an upper fixed value that is a first upper limit value or a second upper limit value. The modulation processing unit selects either of a first fixed value, being the first lower limit value or the first upper limit value, and a second fixed value, being the second lower limit value or the second upper limit value, based on a difference between the phase voltage command values in the down-shift process or the up-shift process.
    Type: Grant
    Filed: June 15, 2017
    Date of Patent: October 30, 2018
    Assignee: DENSO CORPORATION
    Inventor: Takashi Suzuki
  • Patent number: 10099704
    Abstract: Provided is an electromagnetic noise analyzing apparatus, a controlling apparatus, and a controlling method in each of which the continuous change of the running state of a vehicle or a railway vehicle is considered. The controlling apparatus includes: a vehicle running control section which outputs, on the basis of operation information of a vehicle, a vehicle driving parameter as a driving state of the vehicle; a signal converting section which converts the vehicle driving parameter into a noise parameter as an electric parameter; and an electromagnetic noise analyzing section which calculates, on the basis of the noise parameter, the amount of electromagnetic noise propagating in the vehicle.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: October 16, 2018
    Assignee: HITACHI, LTD.
    Inventors: Aya Ohmae, Hiroki Funato, Keisuke Fukumasu
  • Patent number: 10090093
    Abstract: A system includes a sensor configured to detect an electrical leakage current associated with an operation of an industrial machine. The sensor includes a core and a first winding encircling a first portion of the core. The first winding includes a first number of turns. The first winding is configured to obtain a set of electrical current measurements associated with the operation of the industrial machine. The sensor includes a second winding encircling a second portion of the core. The second winding includes a second number of turns. The second winding is configured to obtain the set of electrical current measurements associated with the operation of the industrial machine. The first winding and the second winding are each configured to generate respective outputs based on the set of electrical current measurements. The respective outputs are configured to be used to reduce the occurrence of a distortion of the set of electrical current measurements based on a temperature of the core.
    Type: Grant
    Filed: December 26, 2017
    Date of Patent: October 2, 2018
    Assignee: GENERAL ELECTRIC COMPANY
    Inventor: Dan Tho Lu
  • Patent number: 10040447
    Abstract: A vehicle is provided including an electric machine and at least one controller. The controller, or controllers, are configured to, in response to a reset of the at least one controller while a speed of the vehicle is greater than a threshold value, provide a current command to the electric machine in accordance with calibration values calculated prior to the reset such that inoperability of the electric machine due to the reset is less than one second.
    Type: Grant
    Filed: October 5, 2012
    Date of Patent: August 7, 2018
    Assignee: Ford Global Technologies, LLC
    Inventors: William Reynolds, Daniel Robert Parks, Rimma Isayeva, Jonathan Andrew Butcher
  • Patent number: 9973110
    Abstract: An electrical architecture (1) for converting DC voltage into AC voltage, and vice versa, comprising: —a DC/AC voltage converter (2), comprising a plurality of arms mounted in parallel, each arm comprising two controllable switching cells (12), in series and separated by a mid-point, the arms being paired in H-bridges (11), —for each H-bridge (11), a dedicated control member (13), such that all of the switching cells (12) of said H-bridge (11) can be controlled by this control member (13), each control member (13) being intended to communicate with a same remote control unit (14) through a potential barrier (15).
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: May 15, 2018
    Assignee: Valeo Systemes de Controle Moteur
    Inventors: Hicham Sadki, Nathalie Coia, Boris Bouchez
  • Patent number: 9960724
    Abstract: A driving system for hybrid electric vehicles includes a DC/DC converter configured to convert low-voltage DC power of a vehicle battery into high-voltage DC power according to a first PWM signal generated based on a first PWM carrier signal; a first inverter configured to convert the high-voltage DC power into first AC power according to a second signal generated based on a second PWM carrier signal, and drive a first driving motor according to the first AC power; a second inverter configured to convert the high-voltage DC power into second AC power according to a third PWM signal generated based on a third PWM carrier signal, and drive a second driving motor according to the second AC power; and a PWM phase controller configured to separately control phases of the first to third PWM carrier signals according to an operation mode of each of the first and second driving motors.
    Type: Grant
    Filed: October 20, 2015
    Date of Patent: May 1, 2018
    Assignee: Hyundai Mobis Co., Ltd.
    Inventor: Sang Min Kim
  • Patent number: 9897156
    Abstract: Method for functional testing of a holding brake of an electric motor. Method includes applying, while the holding brake is closed, phase currents to the electric motor in magnitude and angle for producing a current vector; varying, while the holding brake is closed, the phase currents so as to rotate the current vector to be normal to a rotor flux direction at least one time; and checking whether the holding brake slips when the phase currents are being applied.
    Type: Grant
    Filed: June 3, 2014
    Date of Patent: February 20, 2018
    Assignee: B&R Industrial Automation GmbH
    Inventor: Andreas Poelzleithner
  • Patent number: 9800139
    Abstract: A motor control system for adjusting motor speed if a current overload condition occurs. The motor control system may include a motor, a power factor correction (PFC) circuit providing current to the motor, and a signal processor. The PFC circuit may limit current provided to the motor based on an output voltage sensed by the PFC circuit. The signal processor may sense input voltage of the PFC circuit to determine a power limit, then compare sensed or calculated drive power of the motor with the power limit. If the drive power sensed or calculated is greater than the power limit, the signal processor may output a signal for reducing the drive power to the power limit. Limiting the drive power provided to the motor limits or decreases a speed of the motor.
    Type: Grant
    Filed: July 15, 2014
    Date of Patent: October 24, 2017
    Assignee: Nidec Motor Corporation
    Inventors: James L. Skinner, Prakash B. Shahi, Bret S. Clark, Douglas D. Glenn, Christopher D. Schock
  • Patent number: 9780717
    Abstract: A power conversion device includes an inverter configured by arms including phase upper-arm switching elements and phase lower-arm switching elements, a power-supply shunt resistor, lower-arm shunt resistors, and a control unit that generates drive signals corresponding to the phase upper-arm switching elements and the phase lower-arm switching elements from detection values of the voltage detectors. The power conversion device changes a ratio of time in which all of the upper-arm switching elements are in an ON state and time in which all of the lower-arm switching elements are in the ON state in one cycle of switching of the inverter according to a modulation ratio.
    Type: Grant
    Filed: December 3, 2013
    Date of Patent: October 3, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Keisuke Uemura, Takuya Shimomugi, Koichi Arisawa, Yosuke Shinomoto, Shigeo Umehara, Shinichiro Ura, Makoto Tanikawa
  • Patent number: 9739815
    Abstract: The invention relates to a generic method for determining the rotor position of an electronically-commutated multi-phase direct current motor, characterized in: (a) generating of a plurality of test voltage pulses in the winding system with a specified switch-on duration ?T by means of the commuting device in different phase distributed over 360°; (b) measurement of the current values of the current responses of the test voltage pulses on expiration of the switch-on period of the respective test voltage pulse; (c) approximation of the measured current values by means of a periodic approximation function from a superimposition of a preferably sinusoidal fundamental wave with an amplitude IEMK and the associated first harmonic with an amplitude Und as a factor of the phase of the test voltage pulse, wherein the sinusoidal fundamental wave follows the chronological progression of the counter EMF voltage of the stator and the first harmonic follows the chronological progression of the stator of the direct current
    Type: Grant
    Filed: July 11, 2013
    Date of Patent: August 22, 2017
    Assignee: BROSE FAHRZEUGTEILE GMBH & CO. KOMMANDITSELLSCHAFT, WURZBURG
    Inventor: Johannes Schwarzkopf
  • Patent number: 9742333
    Abstract: To achieve smooth switching of control without fluctuations in speed and torque, an excitation current command is allowed to transit linearly or in accordance with the function of speed between a value under sensorless vector control and a value under low-speed region control in accordance with a speed command or estimated speed in a speed region where the control is switched or in an adjacent speed region where sensorless vector control is performed. Therefore, abrupt variations in excitation current are reduced before and after the switching of the control.
    Type: Grant
    Filed: May 11, 2016
    Date of Patent: August 22, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Yoshiyuki Amemiya, Satoru Terashima
  • Patent number: 9735722
    Abstract: At least one example embodiment discloses a method of controlling an alternating current (ac) machine. The method includes determining or retrieving a current limit for the ac machine, determining a characterized peak current value based on a voltage-to-speed ratio of the ac machine, determining current command values for the ac machine based on at least one of the torque command limit and a torque command for the ac machine, determining current command values for the ac machine based on the torque command limit and controlling the ac machine based on the current command values.
    Type: Grant
    Filed: February 19, 2014
    Date of Patent: August 15, 2017
    Assignee: DEERE & COMPANY
    Inventors: Whitney M. Marohl, Long Wu, Anthony Weber
  • Patent number: 9707825
    Abstract: The controller controls an inverter that drives an in-vehicle three-phase motor. The controller includes a voltage application unit, a current obtaining unit, an addition unit, an addition conversion unit, and a derivation unit. The current obtaining unit obtains a positive current and a negative current flowing to each of the three phases. The addition unit adds the positive current and the negative current flowing to each phase. The addition conversion unit performs a three-phase to two-phase conversion on the three addition values. The derivation unit derives a magnetic pole position of the rotor, when the rotor is stopped, based on the conversion result of the addition conversion unit.
    Type: Grant
    Filed: March 14, 2016
    Date of Patent: July 18, 2017
    Assignee: KABUSHIKI KAISHA TOYOTA JIDOSHOKKI
    Inventor: Kazuki Najima
  • Patent number: 9712043
    Abstract: An apparatus for controlling overcurrent of a grid-connected inverter due to an abnormal grid voltage includes a grid voltage sensor configured to sense a grid voltage according to an output current of the grid-connected inverter, a voltage variation calculator configured to calculate a D-axis voltage and a Q-axis voltage of the grid voltage to obtain variation values of the D-axis voltage and the Q-axis voltage, and an output current controller configured to determine whether at least one of the D-axis voltage variation value and the Q-axis voltage variation value exceeds a set value of the grid voltage variation, and decrease the output current by a predetermined value when one of the D-axis voltage variation value and the Q-axis voltage variation value exceeds the set value of the grid voltage variation.
    Type: Grant
    Filed: June 20, 2014
    Date of Patent: July 18, 2017
    Assignee: POSCO ENERGY CO., LTD.
    Inventors: Jeong Heum Lee, Sang Ho Moon, Ju Young Chang, Jae Sig Kim, Jin Su Lee
  • Patent number: 9704076
    Abstract: A rotary encoder correcting method for a transport apparatus having a rotary encoder for outputting output signals in response to rotation of a transport roller. The method includes the steps of setting beforehand the number of n-divided output signals obtained by dividing, by n, the number of output signals outputted from the rotary encoder with one rotation of the transport roller; measuring a divided area shift time for each divided area when a printing medium is transported at constant speed and each time the number of output signals agrees with the number of n-divided output signals; and calculating a correction coefficient for each divided area based on the divided area shift time. The divided area shift time is corrected for each divided area of the rotary encoder based on each correction coefficient when a process is carried out on the printing medium.
    Type: Grant
    Filed: July 19, 2016
    Date of Patent: July 11, 2017
    Assignee: SCREEN HOLDINGS CO., LTD.
    Inventors: Tomoyasu Okushima, Yoshitomo Wada, Osamu Morizono
  • Patent number: 9698709
    Abstract: A motor driving device includes an inverter circuit having switching elements; and a control device controlling the switching of the switching elements. The control device sets a carrier frequency to f1 when a two-phase modulation scheme is selected, and sets the carrier frequency to f0, which is half of the carrier frequency f1, when a three-phase modulation scheme is selected. Thereby, the frequency of the secondary component of a current flowing in a filter circuit of when selecting the three-phase modulation scheme may be deviated from the resonance frequency of the filter circuit. Accordingly, the current ripple generated in the filter circuit may be reduced even when selectively switching the modulation scheme for the PWM modulation among a plurality of modulation schemes.
    Type: Grant
    Filed: June 6, 2013
    Date of Patent: July 4, 2017
    Assignee: DENSO CORPORATION
    Inventor: Koji Sakai
  • Patent number: 9692338
    Abstract: A vector control driving device is provided for an electric motor receiving an operating setpoint, with stator windings receiving a driving current and producing a rotating magnetic field, the windings generating a voltage at terminals of the motor, a rotor producing a magnetic field to follow the rotating magnetic field, the device generating current in a vector domain, and configured to carry out a transform of the current from the vector domain to a real domain allowing for generation of the driving current, and configured to carry out an inverse transform of a parameter measured in the real domain on the stator windings into a transform of the parameter in the vector domain, and comparing the value of the inverse transform of the parameter with a predefined maximum parameter value, which can drive the generating of the current in the vector domain. An automatic and adaptive defluxing method is provided.
    Type: Grant
    Filed: October 15, 2015
    Date of Patent: June 27, 2017
    Assignee: THALES
    Inventors: Stéphane Guguen, Arnaud Dal, Thomas Girier
  • Patent number: 9673748
    Abstract: A motor control circuit controls an operation of a motor based on an input voltage and a control parameter. A voltage-abnormality detection unit detects abnormality of the input voltage by comparing the input voltage with an allowable voltage range. A memory stores therein a plurality of allowable voltage range candidates made to correspond to a plurality of reference voltages and a plurality of control parameter candidates made to correspond to the plurality of reference voltages. A reference-voltage acquisition unit acquires reference voltage information specifying one of the plurality of reference voltages.
    Type: Grant
    Filed: February 18, 2014
    Date of Patent: June 6, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventor: Kenji Ogawa
  • Patent number: 9647585
    Abstract: Brushless direct-current (“BLDC”) motor and control for a power tool. A BLDC motor of a power tool is controlled in either a pulse-width modulation (“PWM”) commutation mode or a centerline commutation mode. When the motor is rotating slowly, the motor is operated using PWM commutation. When the motor is rotating at a speed greater than a threshold speed value, the operation of the motor is transitioned to the centerline commutation mode. When operating in the centerline commutation mode, the high-side field-effect transistors (“FETs”) and low-side FETs can each be used for motor speed control. By switching between speed control using the high-side FETs and speed control using the low-side FETs, the heat generated by freewheeling currents can be approximately evenly distributed among the high-side and low-side FETs.
    Type: Grant
    Filed: October 29, 2015
    Date of Patent: May 9, 2017
    Assignee: MILWAUKEE ELECTRIC TOOL CORPORATION
    Inventors: Matthew J. Mergener, Matthew P. Wycklendt
  • Patent number: 9602030
    Abstract: The present disclosure illustrates a motor drive circuit. The motor drive circuit includes a resistor module, a multiplexer, a data control unit, an analog-to-digital converter and a register. The resistor module receives an input voltage and generates at least one parameter voltage. The parameter voltage is associated with a motor speed curve of a motor. The multiplexer receives the parameter voltage. The data control unit controls the multiplexer to output the parameter voltage. The analog-to-digital converter receives the parameter voltage and converts the parameter voltage to digital form, and then outputs the digital parameter voltage to the data control unit. The register stores the digital parameter voltage outputted by the data control unit. A controller determines the motor speed curve according to the digital parameter voltage stored in the register, and drives the motor in response to the motor speed curve.
    Type: Grant
    Filed: October 1, 2015
    Date of Patent: March 21, 2017
    Assignee: ANPEC ELECTRONICS CORPORATION
    Inventor: Kun-Min Chen
  • Patent number: 9602040
    Abstract: In an apparatus, a determiner determines whether a two-MG frequency ratio of a first electrical frequency of a first MG to a second electrical frequency of a second MG is within a specific frequency-ratio range. The specific frequency-ratio range includes 1/6n where n is an integer excluding zero. An update-cycle controller controls an update cycle of a command voltage according to the determined result such that the update cycle during a specific drive of the first MG is longer than the update cycle during a usual drive of the first MG while a cycle of a carrier signal is maintained during both the usual and specific drives. The specific drive represents drive of the first MG while the two-MG frequency ratio is within the specific frequency-ratio range. The usual drive represents drive of the first MG while the two-MG frequency ratio is out of the specific frequency-ratio range.
    Type: Grant
    Filed: September 28, 2015
    Date of Patent: March 21, 2017
    Assignee: DENSO CORPORATION
    Inventor: Shigenori Takahashi
  • Patent number: 9543877
    Abstract: An apparatus for controlling a switched reluctance motor with use of a power conversion circuit. In the apparatus, a command voltage setter sets a command voltage for a coil of the motor, where the command voltage is set to change gradually during either or both of a ramp-up period and a ramp-down period of the command voltage. A voltage controller controls an applied voltage to the coil to the command voltage set by the command voltage setter by operating the power conversion circuit.
    Type: Grant
    Filed: February 28, 2014
    Date of Patent: January 10, 2017
    Assignee: DENSO CORPORATION
    Inventor: Yoshinobu Kamada
  • Patent number: 9520824
    Abstract: An object of the present invention is to achieve stable inverter control by means of current detection using one current sensor in all of periods in which overmodulation control is performed. An inverter controller includes a ?-axis current calculation section that holds, in advance, a ?-axis current arithmetic expression including a direct current as a parameter, and calculates a ?-axis current using a direct current detected by a current sensor for the ?-axis current arithmetic expression.
    Type: Grant
    Filed: October 3, 2012
    Date of Patent: December 13, 2016
    Assignee: Mitsubishi Heavy Industries Automotive Thermal Systems Co., Ltd.
    Inventors: Kyohei Watanabe, Kenichi Aiba, Takayuki Takashige
  • Patent number: 9518570
    Abstract: A motor controller includes a motor winding heater function. The motor controller applies a predefined current to one or more of the motor windings without the use of additional dedicated motor winding heater devices. The motor controller serves to control the operation of the motor, while the motor windings serve both as a heater at times and to produce torque at times.
    Type: Grant
    Filed: April 12, 2012
    Date of Patent: December 13, 2016
    Assignee: Rockwell Automation Technologies, Inc.
    Inventors: David Messersmith, Andrew Jaap
  • Patent number: 9484829
    Abstract: A power conversion device including a power conversion portion that switches direct current voltage supplied by a positive line and negative line of a direct current power supply with a semiconductor switching element, and outputs converted voltage, is such that a plurality of interline capacitors are connected in parallel between the positive line and negative line, the capacitance of the plurality of interline capacitors is of a value that becomes smaller the nearer to the power conversion portion the position in which the interline capacitor is connected, and the capacitance of the interline capacitor with the smallest value of capacitance is set to a value greater than that of the capacitance between main electrodes when a direct current voltage is applied to the switching element used in the power conversion portion.
    Type: Grant
    Filed: July 14, 2014
    Date of Patent: November 1, 2016
    Assignees: FUJI ELECTRIC CO., LTD., FUJI ELECTRIC FA COMPONETS & SYSTEMS CO., LTD.
    Inventors: Miwako Fujita, Takashi Kaimi
  • Patent number: 9484839
    Abstract: A power converter according to one embodiment includes a controller that switches between a boosting operation in a boost circuit and a pulse-width modulation operation in a single-phase inverter. The controller modifies an output from a voltage detection filter based on a delay compensating value for compensating a detection delay introduced by the voltage detection filter, when switching is performed the boosting operation in the boost circuit to the PWM operation in the single-phase inverter.
    Type: Grant
    Filed: January 29, 2015
    Date of Patent: November 1, 2016
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Seiji Fujisaki, Mamoru Takaki, Shinya Morimoto, Masato Higuchi
  • Patent number: 9479094
    Abstract: An apparatus for compensating for a torque for a current order of a driving motor includes: a current order generator configured to: i) receive a torque order (Tref*), ii) generate a magnetic flux-based current order map using a generated driving point ratio (1/?max), and iii) generate a current order using the generated current order map; and an iron loss torque compensator configured to extract an iron loss torque compensation value for the generated current order and a speed (Wrpm) of the driving motor.
    Type: Grant
    Filed: December 13, 2014
    Date of Patent: October 25, 2016
    Assignee: Hyundai Motor Company
    Inventors: Young Un Kim, Jeong Won Rho, Jae Sang Lim
  • Patent number: 9473043
    Abstract: According to an exemplary implementation, an integrated circuit (IC) includes a logic circuit monolithically formed on the IC. The logic circuit is configured to generate modulation signals for controlling power switches of a power inverter. The logic circuit generates the modulation signals based on at least one input value. The IC further includes a voltage level shifter monolithically formed on the IC. The voltage level shifter is configured to shift the modulation signals to a voltage level suitable for driving the power switches of the power inverter. The logic circuit can be a digital logic circuit and the input value can be a digital input value. The IC can also include a sense circuit monolithically formed on the IC. The sense circuit is configured to generate the input value.
    Type: Grant
    Filed: March 31, 2015
    Date of Patent: October 18, 2016
    Assignee: Infineon Technologies Americas Corp.
    Inventors: Marco Giandalia, Toshio Takahashi, Massimo Grasso
  • Patent number: 9461574
    Abstract: A motor control system for determining a reference d-axis current and a reference q-axis current is provided. The motor control system includes a motor, a DC power source and DC input lines, and a current command controller. The DC power source generates a bridge voltage across the DC input lines. The current command controller is configured to monitor the bridge voltage and a torque reference command. The current command controller is configured to calculate the reference q-axis current based on a torque reference command. The current command controller is configured to calculate the reference d-axis current based on a magnitude of the reference q-axis current.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: October 4, 2016
    Assignee: STEERING SOLUTIONS IP HOLDING CORPORATION
    Inventors: Abraham Gebregergis, Ramakrishnan RajaVenkitasubramony, Tomy Sebastian, Siddharth Ballal
  • Patent number: 9438097
    Abstract: A method is provided for controlling the current intensity of the electric current flowing through an inductive consumer, the consumer being connected in series to a switching device and a current measuring unit, and in parallel to a free-wheeling element, and the switching device being activated for adjusting the current intensity during a pulse width modulation period.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: September 6, 2016
    Assignee: ROBERT BOSCH GMBH
    Inventors: Dieter Schwarzmann, Marco Martini, Christian Klein, Thomas Wieja, Bernd Mueller, Uwe Guenther, Alexander Herrmann, Steffen Reinhardt, Beate Leibbrand, Christian Lammers
  • Patent number: 9400508
    Abstract: In a torque ripple suppression control effected by a periodicity disturbance observer, it is necessary to consider plant fluctuation and fluctuation of plant characteristics caused by over time usage. Thus, improvement for robustness to an identification model error has been required.
    Type: Grant
    Filed: April 11, 2012
    Date of Patent: July 26, 2016
    Assignee: MEIDENSHA CORPORATION
    Inventors: Takashi Yamaguchi, Yugo Tadano, Kazunobu Oi
  • Patent number: 9372234
    Abstract: Systems, apparatus, and methods detect a current sensor error in an FOC electric machine system. A voltage command is monitored to detect the presence of an ac component that indicates that an error has occurred at a current sensor. For example, a sensor fault detection module can be configured to determine the deviation between an actual voltage command and an ideal voltage command to provide a complex deviation vector. By transforming the deviation vector to a reference frame rotating at the fundamental frequency of the command voltage, a dc component of the positive and negative sequences can be filtered, and their amplitudes determined. Error detection can be based on the total amplitude of the fundamental component, determined by positive and negative component amplitudes. Sensor error detection enables an FOC system to operate with two current sensors, rather than three, and provides a dedicated fault diagnostic for a current sensor.
    Type: Grant
    Filed: August 27, 2013
    Date of Patent: June 21, 2016
    Assignee: Ford Global Technologies, LLc
    Inventors: Chang-jiang Wang, Michael Degner, Rimma Isayeva, Liwen Xu, Daniel R. Luedtke
  • Patent number: 9344026
    Abstract: An induction motor controller is provided. The induction motor controller includes a first module that derives a commanded stator voltage vector, in a stator flux reference frame, via a rotor flux regulator loop and a torque regulator loop, which process at least partially in the stator flux reference frame. The induction motor controller includes a second module that processes the commanded stator voltage vector to produce AC (alternating current) power for an induction motor.
    Type: Grant
    Filed: July 23, 2013
    Date of Patent: May 17, 2016
    Assignee: Atieva, Inc.
    Inventor: Yifan Tang
  • Patent number: 9270220
    Abstract: A motor controller includes a square wave voltage generator and adding circuitry for adding the square wave voltage to a first drive voltage that is connectable to the stator windings of a motor. A current monitor for monitoring the input current to the motor as a result of the square wave voltage. A device for determining the position of the rotor based on the input current.
    Type: Grant
    Filed: April 4, 2014
    Date of Patent: February 23, 2016
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: David P. Magee, Shih-Chin Yang