Responsive To Motor Condition Patents (Class 318/798)
  • Patent number: 10381888
    Abstract: A motor driving method is applied to a motor with a rotor comprising a magnetic reluctance structure. The motor driving method comprises enabling the motor by an asynchronous driving method, controlling the motor by the asynchronous driving method according to a speed regulation command, detecting a rotor speed of the motor and determining whether the rotor speed is larger than a speed threshold, and when the rotor speed is larger than the speed threshold, controlling the motor by a synchronous driving method.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: August 13, 2019
    Inventors: Ming-Mao Hsu, Yu-Yuan Chen, Tsu-Min Liu
  • Patent number: 10340831
    Abstract: A vibration suppression method and device of a wind power generator is provided. The method includes: calculating a specified value of a flux-weakening control parameter of the generator according to a preset value of an electromagnetic active power of the generator and a frequency of the generator; and controlling the generator according to the specified value of the flux-weakening control parameter of the generator. The method and device reduce the magnetic load of the generator by the flux-weakening control, thereby suppress vibration and noise of the generator.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: July 2, 2019
    Assignee: Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd.
    Inventors: Yong Liu, Xiaohe Zhang, Xiang Zhao
  • Patent number: 10312838
    Abstract: A drive system has an electric motor, wherein the electric motor includes a first three-phase stator winding system and a second three-phase stator winding system. The first and the second stator winding system are arranged on the stator in a manner rotated through an electrical phase angle in relation to one another. The drive system includes a frequency converter, wherein the frequency converter has a first bridge circuit arrangement which is designed to generate voltages for the first winding system and a second bridge circuit arrangement which is designed to generate voltages for the second winding system. The first bridge circuit arrangement and the second bridge circuit arrangement are connected in series. A control device is designed to actuate the first bridge circuit arrangement and the second bridge circuit arrangement.
    Type: Grant
    Filed: August 19, 2016
    Date of Patent: June 4, 2019
    Assignee: Lenze Drives GmbH
    Inventors: Heiko Stichweh, Felix Klute, Torben Jonsky, Thorsten Hohnsbein, Volker Grabs, Holger Borcherding
  • Patent number: 10275374
    Abstract: Disclosed herein is a method for controlling interrupts in an inverter. If a control unit checks that an interrupt is issued in main software while an inverter is operating, the control unit analyzes the type of the interrupt. The interrupt is converted into an interrupt ID sorted by functionality. If the interrupt ID is a previously registered interrupt ID, an interrupt function corresponding to the registered interrupt ID is executed.
    Type: Grant
    Filed: March 20, 2017
    Date of Patent: April 30, 2019
    Assignee: LSIS CO., LTD.
    Inventor: Bong-Ki Lee
  • Patent number: 10254374
    Abstract: A method for estimating torque control error at an electric machine considers the effects of current sensor error characteristics. Systems and methods can be practiced to determine the maximum sensor error that can be tolerated without causing unacceptable torque error. An example method uses sensor characteristics and machine characteristics to determine current sensing error, current control error, and torque control error. Determining the lowest sensor accuracy required for a desired torque control accuracy can facilitate the use of lower cost sensors in current-feedback controlled electric drive systems without compromising performance. Other applications can include vehicle diagnostics and torque error compensation.
    Type: Grant
    Filed: July 16, 2013
    Date of Patent: April 9, 2019
    Inventors: Chang-jiang Wang, Michael Degner
  • Patent number: 10243366
    Abstract: An annex supply system for an electrical power plant includes an energy extraction network configured to receive AC current from a main production unit, a main auxiliary network coupled to the extraction network, and a secondary supply unit. The secondary unit includes a storage element coupled to a means for reversible conversion from direct to alternating current that is controllable to selectively (i) charge the storage element from the main auxiliary network, and (ii) discharge energy from the storage element to the main auxiliary network. The secondary unit is configured to (i) provide a first power profile at least sufficient to provide services to a transmission network, and/or (ii) provide to the main auxiliary network a second power profile required to operate auxiliary equipment in case of inoperability of a normal power supply source of the main auxiliary network.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: March 26, 2019
    Inventor: Hervé Biellmann
  • Patent number: 10243496
    Abstract: A method controls the operation of an electric motor. Wherein electrical voltages applied to electrical phases of the electric motor are produced and output in a controlled manner in a modulation on the basis of a rotor position of the electric motor, on the basis of a set point/actual comparison, which is performed in a control loop with a speed controller, for a speed of the electric motor and on the basis of a set point/actual comparison. A set point value at the input of the current regulator is formed by multiplying a present duty factor for the modulation by a first manipulated variable applied to the output of the speed controller. The first manipulated variable of the speed controller becomes an equivalent phase current root mean square value for the electric motor in the underlying current regulator by the multiplication by the present duty factor.
    Type: Grant
    Filed: June 9, 2015
    Date of Patent: March 26, 2019
    Assignee: Conti Temic microelectronic GmbH
    Inventors: Patrick Hinze, Andreas Schulze, Matthias Peuckert
  • Patent number: 10236676
    Abstract: The invention is a pulse-controlled inverter with one or more semiconductor switches and freewheeling diodes arranged in parallel to each semiconductor switch. The semiconductor switches are triggered only when the current does not flow through a freewheeling diode that is arranged in parallel to the semiconductor switch. This allows the number of triggering processes for the semiconductor switch to be reduced. The reduced number of triggering processes for the semiconductor switches results in lower power losses and an increased service life of the entire system.
    Type: Grant
    Filed: September 18, 2015
    Date of Patent: March 19, 2019
    Assignee: Robert Bosch GmbH
    Inventors: Gunther Goetting, Kay Hindorf, Mark Damson, Thomas Wiecha, Daniel Raichle, Jochen Kuehner
  • Patent number: 10153716
    Abstract: A microcontroller controls a BLDC motor with Hall sensors. In a calibration mode, the microcontroller operates the motor at substantially constant load and speed. A first current value across the motor is detected. A reference phase angle value is adjusted and a second current value is detected. If the second current value is less than the first current value, then the reference phase angle value is adjusted and a next current value is detected. The adjusting and detecting is repeated until the next current value is greater than the previous current value indicating that the adjustment increased current across the motor. The adjusted reference phase angle value before increased motor current is stored. In a normal operating mode, using the adjusted reference phase angle value results in desired motor operation where minimal current is consumed for a given load and speed despite asymmetries in motor windings and Hall sensor placement.
    Type: Grant
    Filed: April 24, 2017
    Date of Patent: December 11, 2018
    Assignee: IXYS, LLC
    Inventors: Eric Arnold Hardt, Thomas Andrew Ormiston
  • Patent number: 10075088
    Abstract: A load commutated converter interconnects an AC power grid with an AC load and comprises a grid-side converter, a DC link and a load-side converter. A method for controlling the load commutated converter comprises: determining a gridside firing angle for the grid-side converter; determining a load-side firing angle for the load-side converter; determining a grid voltage of the AC power grid; modifying the grid-side firing angle and/or the load-side firing angle based on the grid voltage, such that when an undervoltage condition in the AC power grid occurs, the operation of the load commutated converter is adapted to a change in the grid voltage; and applying the grid-side firing angle to the grid-side converter and the load-side firing angle to the load-side converter.
    Type: Grant
    Filed: June 9, 2017
    Date of Patent: September 11, 2018
    Assignee: ABB Schweiz AG
    Inventors: Thomas Besselmann, Stefan Almer, Jan Wiik, Sture Van de Moortel
  • Patent number: 10003294
    Abstract: An apparatus for controlling a rotary electric machine includes: first and second inverters corresponding to first and second winding groups; first and second voltage detectors; and first and second control units. Each of the first and second inverters includes plurality of switching elements. The first and second voltage detectors each detects input voltage of corresponding inverter. The first control unit limits a first current command value of the first winding group, when both of the first and second inverter input voltages are in normal, and a first differential value is larger than a determination threshold, and the second control unit limits a second current command value of the second winding group, when both of the first and second inverter input voltages are normal, and a second differential value is larger than the determination threshold.
    Type: Grant
    Filed: May 25, 2017
    Date of Patent: June 19, 2018
    Inventor: Yoshimichi Hara
  • Patent number: 9998054
    Abstract: An electric submersible pump (ESP) variable speed drive (VSD) controller is described. A VSD control system includes a pump assembly including an induction motor operatively coupled to a pump, a power cable and a transformer electrically coupled between the induction motor and a VSD controller that controls a speed of the induction motor, the VSD controller including a converter section that sends a direct current (DC), a DC link including a DC smoothing capacitor that smooths the DC, an inverter that converts the smoothed DC to a pulse width modulated (PWM) output voltage, the inverter including at least one silicon carbide (SiC) power semiconductor module, and a PWM filter that filters the PWM output voltage to produce near sinusoidal voltages, the PWM filter including inductors, and the PWM filter sending voltage to the transformer.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: June 12, 2018
    Assignee: Summit ESP, LLC
    Inventors: Tom G. Yohanan, Ryan Bridwell Ashbaugh, John Vanderstaay Kenner
  • Patent number: 9982680
    Abstract: Inputting an input resistance to an operational amplifier. Detecting whether a number of fans are in operation based on the input resistance to the operational amplifier by driving a number of resistors connected in series in a fan circuit associated with the number of fans.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: May 29, 2018
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Pedro Miguel Teixido Rovira, Santiago Sanz Ananos, Fernando Bayona Alcolea
  • Patent number: 9979333
    Abstract: The present disclosure relates to an inverter, and more specifically to an inverter that can be restarted stably by determining whether to restart it when power is supplied after a failure has occurred in the inverter due to a fault in the main supply.
    Type: Grant
    Filed: November 21, 2016
    Date of Patent: May 22, 2018
    Assignee: LSIS CO., LTD.
    Inventors: Seung-Cheol Choi, Anno Yoo
  • Patent number: 9919903
    Abstract: A multi-speed electric motor may include a plurality of windings arranged into winding phase groups. A speed controller may switch two or more windings between a series and a parallel configuration in each winding phase group. The speed controller may also switch the winding phase groups between a delta and a Wye configuration. By selecting a specific configuration, one or more of the holding torque, torque ratio, no-load maximum speed, and volts/Hz ratio of the AC motor may be optimized for a given application. In some embodiments, the AC motor may be used as part of a piece of drilling rig equipment such as a drawworks, winch, mud pump, top drive, or rotary table.
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: March 20, 2018
    Inventors: Charles Patrick, Kevin R. Williams
  • Patent number: 9876461
    Abstract: A control and protection apparatus for an electric motor, comprising an inverter (3), a first converter (1), a temperature detection apparatus (7), and a second converter (2). The first converter (1) is used for generating, on the basis of an input signal, a first control signal to control working of the inverter (3). The temperature detection apparatus (7) is used for detecting the temperature of the electric motor (4) and for acquiring a temperature signal. The second converter (2) is used for generating a second control signal on the basis of the temperature signal detected and for providing the second control signal to the inverter (3). The inverter (3) is used for controlling wording of the electric motor (4) on the basis of the first control signal and of the second control signal. The control and protection apparatus for the electric motor is low in costs and high in safety and reliability.
    Type: Grant
    Filed: February 12, 2015
    Date of Patent: January 23, 2018
    Assignee: Eaton Corporation
    Inventors: Kevin Lee, Robert A. Fenton, Xiaoling Li, Leo Sun, Jiankun Xin
  • Patent number: 9871443
    Abstract: A power control circuit is provided, which includes a pin and a current source. The current source is electrically coupled to the pin and provides a reference current to the pin to generate a set voltage. The set voltage increases along with time after the current source provides the reference current to the pin. The power control circuit activates an over current protection scheme according to the set voltage.
    Type: Grant
    Filed: November 9, 2015
    Date of Patent: January 16, 2018
    Assignee: Nuvoton Technology Corporation
    Inventor: Heng-Lung Lin
  • Patent number: 9857406
    Abstract: Disclosed are a three-phase wiring detection device and a coincidence phase detection method. The three-phase wiring detection device and the coincidence phase detection method compare a power factor relationship between a three-phase voltage and a three-phase current, and determines whether a coincidence phase is coincident between the three-phase voltage and the three-phase current, thereby checking whether the coincidence phase is accurately coincident. Therefore, whether the coincidence phase is coincident between the three-phase voltage and the three-phase current can be checked, and a function of a reverse phase detector and a function of a coincidence phase checker can be implemented. Also, the three-phase voltage and the three-phase current can be accurately detected.
    Type: Grant
    Filed: December 15, 2014
    Date of Patent: January 2, 2018
    Assignee: LSIS CO., LTD.
    Inventor: Jae Jun Yun
  • Patent number: 9837950
    Abstract: A vehicle control device according to one embodiment includes an inverter converting a DC power to a three-phase AC power and supplying the three-phase AC power to a motor driving a vehicle. A detector detects a current value between the inverter and the motor. A controller PWM-controls the inverter based on a current value detected by the detector, a speed command signal, and a rotor frequency of the motor. The controller determines occurrence of a malfunction when a PWM modulation rate is equal to or higher than a predetermined value and the rotor frequency is equal to or lower than a predetermined value.
    Type: Grant
    Filed: January 25, 2016
    Date of Patent: December 5, 2017
    Inventors: Hiroaki Otani, Masanao Itoh
  • Patent number: 9813007
    Abstract: A control system for an electric motor, the control system comprising a first control device arranged to control an operation of a first component of the electric motor; a second control device arranged to control an operation of a second component of the electric motor, wherein the first control device is arranged to transmit to the second control device a first signal for indicating the transmission of data over a first communication link to the second control device, wherein the second control device is arranged to use the timing of the first signal to synchronize the operation of the second component with the operation of the first component.
    Type: Grant
    Filed: April 11, 2014
    Date of Patent: November 7, 2017
    Inventors: Richard Burke, Anthony Morrell, Timothy Martin
  • Patent number: 9692314
    Abstract: A detection circuit for an AC-to-AC power converter includes a voltage divider circuit that has three AC input terminal coupled respectively to three input ends of a power converter which are to receive respectively three AC input power signals with different phases, and that receives a predetermined first reference voltage. Upon receiving one AC input power signal, the voltage divider circuit outputs a divided voltage, which during an active period of the one AC input power signal, is greater than a predetermined second reference voltage, to a comparator, which also receives the predetermined second reference voltage, such that the comparator outputs a detection signal that is in an active state when the one AC input power signal is.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: June 27, 2017
    Assignees: Lite-On Electronics (Guangzhou) Limited, Lite-on Technology Corp.
    Inventors: Yen-Shin Lai, Pane-You Liu
  • Patent number: 9685899
    Abstract: An inverter which supplies a load-adaptive boost voltage and drives an induction motor includes a reference voltage determining unit configured to determine a reference voltage according to a reference frequency on the basis of a predetermined a relationship between a voltage and a frequency, an inverter unit configured to drive the induction motor according to the reference voltage, and an automatic torque boost voltage calculation unit configured to determine an automatic torque boost voltage value according to a magnitude of an output current from the inverter to the induction motor, wherein the reference voltage determining unit adds a preset manual boost voltage value and an automatic torque boost voltage value to the reference voltage and outputs the resultant voltage value as a final reference voltage.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: June 20, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Hyojin Kim
  • Patent number: 9660560
    Abstract: A drive system for a brushless DC motor having a rotor includes at least one permanent magnet and a stator including at least one phase winding. The system has a drive circuit including a switch associated with the winding for varying the current passing through the winding; a rotor position sensor arranged to sense the position of the rotor; and a controller arranged to provide drive signals to control the switch. The drive system is further arranged to receive a temperature signal that has a value dependent upon the temperature of the at least one magnet of the rotor. The controller is arranged to vary the phase of the current passing through the winding relative to the rotor position dependent upon the temperature of the rotor magnet.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: May 23, 2017
    Assignee: TRW LIMITED
    Inventor: Graham Alastair Richard Kemp
  • Patent number: 9641121
    Abstract: A power conversion device includes a power-supply shunt resistance that is provided between an inverter and the negative-voltage side of a DC power supply, and respective-phase lower-arm shunt resistances that are provided between the power-supply shunt resistance and respective-phase lower-arm switching elements. Respective-phase lower-arm voltages, that are respective voltages between the negative-voltage side of the DC power supply and connection points between the respective-phase lower-arm switching elements and the respective-phase lower-arm shunt resistances, are detected to calculate respective-phase currents that flow through a load device in accordance with detection values of the respective-phase lower-arm voltages, and to control a carrier frequency of a carrier signal, which serves as a reference frequency of each drive signal, according to a change in a specific control parameter A.
    Type: Grant
    Filed: April 12, 2013
    Date of Patent: May 2, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takuya Shimomugi, Keisuke Uemura, Koichi Arisawa, Yosuke Shinomoto, Shigeo Umehara, Shinichiro Ura, Makoto Tanikawa
  • Patent number: 9628002
    Abstract: The system contains a controller unit comprising a memory device, a processing unit, and at least one analog-to-digital converter. A power stage has a plurality of switches, wherein the power stage receives a control signal from the control circuit and a power signal from a power source. The power stage drives two windings of the set of three stator windings to rotate a rotor and maintains one stator winding of the three stator windings undriven. The memory device stores a plurality of values for the driven current and a plurality of demodulated undriven winding voltages. The processing unit compares the plurality of values and periodically calculates a rotor sextant while the rotor rotates. The processing unit compares at least two demodulated undriven winding voltage values corresponding to at least two current values within the rotor sextant to calculate the rotor sextant parity and verify the calculation of the rotor sextant.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: April 18, 2017
    Assignee: CIRRUS LOGIC, INC.
    Inventors: Branislav Pjetar, Marc J. Kobayashi
  • Patent number: 9566916
    Abstract: A method for operating a hybrid electric vehicle having a variable voltage converter (VVC) includes commanding a first voltage across a VVC in response to a signal requesting a VVC test, continuously monitoring a first VVC voltage difference over a first calibratable time period, and generating a diagnostic signal if the first voltage difference exceeds a first calibratable threshold for the duration of a first calibratable time period. The method further includes, in response to the first voltage difference dropping below the first calibratable threshold, commanding a second voltage across the VVC, continuously monitoring a second VVC voltage difference over a second calibratable time period, generating a diagnostic signal if the second voltage difference exceeds a second calibratable threshold for the duration of a second calibratable time period, and signaling a test pass in response to the second voltage difference dropping below the second calibratable threshold.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: February 14, 2017
    Assignee: Ford Global Technologies, LLC
    Inventors: Balakrishna Rao, Rimma Isayeva
  • Patent number: 9496768
    Abstract: Embodiments provide an electrical machine, comprising: first and second moveable elements arranged to interact in a magnetically geared manner via a magnetic field created, at least in part, by a first electrical winding arrangement associated with the first moveable element; and a second electrical winding arrangement which is arranged to interact magnetically with a fundamental harmonic of a magnetic field created by the first electric winding arrangement associated with the first moveable element.
    Type: Grant
    Filed: May 29, 2009
    Date of Patent: November 15, 2016
    Assignee: Magnomatics Limited
    Inventors: Jan Jozef Rens, Kais Atallah
  • Patent number: 9496798
    Abstract: A Variable Speed Drive (1) for subsea installations (20), subsea vessels or subsea vehicles, as well as to a corresponding subsea installation (20), subsea vessel or subsea vehicle, has an alternating current/alternating current converter (2) having a current-controlled capacitor-less direct current link (7).
    Type: Grant
    Filed: March 12, 2015
    Date of Patent: November 15, 2016
    Inventor: Ove Boe
  • Patent number: 9484847
    Abstract: A method for controlling a motor propulsion unit including a motor including a permanent magnet rotor and a stator, the method including regulating currents of the stator so that they attain their setpoints by virtue of control signals, the currents to be regulated and the control signals being expressed in a rotating reference frame including a plurality of axes. The regulating includes for each of the axes of the plurality of axes applying, to the current to be regulated on the respective axis, a linear operator differing as a function of a value of the current to be regulated with respect to its setpoint, the result of the application of the linear operator being a control signal on the respective axis.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: November 1, 2016
    Assignee: RENAULT s.a.s.
    Inventor: Abdelmalek Maloum
  • Patent number: 9479107
    Abstract: An over temperature protection device for electric motors applicable to a railway vehicle driving system that operates a plurality of electric motors in parallel using one or a plurality of inverter devices includes a control device configured to control the operation of an inverter device and a protecting device configured to detect, on the basis of a frequency fs including frequency information at the time when the inverter device is applying control for fixing a ratio of a voltage and a frequency to electric motors and electric currents of at least one phase flowing to the electronic motors, an over temperature that could occur in the electric motors, to generate an over temperature protection signal Tf for protecting the electric motors from the over temperature, and to output the over temperature protection signal Tf to the control device.
    Type: Grant
    Filed: September 8, 2011
    Date of Patent: October 25, 2016
    Inventors: Tomohiro Kojiya, Yuruki Okada
  • Patent number: 9419554
    Abstract: A control device of a three-phase AC motor includes: an inverter for driving the motor; a current sensor for sensing a sensor phase current of the motor; and a controller for controlling the motor. The controller includes: a current estimation device for estimating d-axis and q-axis current estimated values based on the sensor phase current and an electric angle of the motor; and a zero-crossing interpolation device for interpolating the d-axis and q-axis current estimated values by fixing the d-axis and q-axis current estimated values when the sensor phase current is in a zero cross range, which includes a zero point, so that the sensor phase current crosses the zero point, and for outputting interpolated d-axis and q-axis current estimated values as fixed d-axis and q-axis values, which are used for a feedback control relating to current flowing through the motor.
    Type: Grant
    Filed: August 13, 2014
    Date of Patent: August 16, 2016
    Inventors: Ryuji Omata, Takahumi Oowada
  • Patent number: 9413283
    Abstract: A motor control system includes a plurality of motors, a plurality of inverters, and a controller. The plurality of inverters are configured to drive the plurality of respective motors and are coupled to a common bus line through which DC power is supplied. When power supply is interrupted, the controller is configured to calculate a frequency command value so as to maintain a bus line voltage across the common bus line and configured to supply the frequency command value to the plurality of inverters.
    Type: Grant
    Filed: December 1, 2014
    Date of Patent: August 9, 2016
    Inventor: Takahiro Saeki
  • Patent number: 9413278
    Abstract: A control device for a rotating electrical machine is provided that is capable of suppressing reduction in controllability of torque attributed to harmonic currents. According to the exemplary embodiment of the present invention, a designated torque value Trq* designated by a hybrid vehicle electronic control unit (HVECU) is corrected by a compensation amount ?Trq calculated using a harmonic voltage Vh, the designated torque value Trq*, and an electric angular velocity ? as inputs. An operating signal generating section generates an operating signal g¥# using a designated norm value Vn set based on the corrected torque designated value Trq* and a phase ? serving as a manipulated variable for performing feedback control of an estimated torque to the designated torque value Trq*, and outputs the generated operating signal g¥# to a power supply circuit of a motor generator.
    Type: Grant
    Filed: July 1, 2013
    Date of Patent: August 9, 2016
    Inventors: Koichi Nishibata, Hiroya Tsuji, Hajime Uematsu
  • Patent number: 9407085
    Abstract: A controller for a brushless motor that is configured to operate in normal mode or under-voltage mode. When operating in normal mode, the controller generates control signals for exciting a winding of the motor, monitors the magnitude of an input voltage, and switches to under-voltage mode in the event that the input voltage drops below an under-voltage threshold. When operating in under-voltage mode, the controller suspends excitation of the winding, monitors the magnitude of the input voltage, monitors the magnitude of a supply voltage used to power the controller, switches to normal mode in the event that the input voltage exceeds a restart threshold, and resets itself in the event that the supply voltage drops below a brown-out threshold.
    Type: Grant
    Filed: July 1, 2014
    Date of Patent: August 2, 2016
    Assignee: Dyson Technology Limited
    Inventors: Libo Zheng, Yongji Zhou, Tuncay Celik
  • Patent number: 9407189
    Abstract: An AC motor controller is provided that utilizes a direct torque controller and primary and secondary control loops. The primary control loop operates in a relatively conventional manner, determining a voltage vector that sets the inverter switching variables for the motor's power inverter, where the voltage vector is based on the motor's torque and flux as estimated from the measured voltage and current of the motor. The secondary loop, utilizing a faster sampling rate than the primary loop, estimates a more up-to-date torque error which is compared to a secondary torque error band, where the secondary torque error band is preferably narrower that the primary torque error band. If the secondary loop determines that the up-to-date torque error has exceeded the secondary torque error band, it sets a null voltage vector, thereby limiting torque ripples.
    Type: Grant
    Filed: July 16, 2014
    Date of Patent: August 2, 2016
    Assignee: Atieva, Inc.
    Inventor: Yifan Tang
  • Patent number: 9362735
    Abstract: A feed chain (16) has M feed outputs (31) for supplying a synchronous electric machine (14) with M phases. The feed chain comprises: a converter (22) for converting a direct input current into a polyphase alternating current; a storage bank; a detector (30) for detecting a short-circuit outside or inside the electric machine (14), a device (26) for insulating the electric machine (14) from overvoltages and/or overcurrents of the polyphase alternating current, and a controller (28) for controlling the converter (22) and the insulating device (26). The feed chain (16) includes short-circuiting device (27) capable of connecting the M power supply outputs (31) to each other, the controller (28) being capable of commanding the short-circuiting device (27) to perform that operation.
    Type: Grant
    Filed: February 28, 2013
    Date of Patent: June 7, 2016
    Inventors: David Cypers, Olivier Giacomoni, Sebastien Belin, Guillaume Desportes
  • Patent number: 9291678
    Abstract: For each phase of a controller, a pair of semiconductor switches comprises a high side switch and a low side switch. A direct current voltage bus provides electrical energy to the semiconductor switches at a test voltage level less than a full operational voltage level. A measuring circuit is adapted to measure the direct current bus voltage. A data processor determines that a deficiency in a tested, related semiconductor switch is present if the measured direct current bus voltage decreases or collapses upon activation of a particular semiconductor switch in the same phase of the controller, or if other sequential test results indicate a deficiency. If the deficiency in the related semiconductor switch is present the processor may prevent the voltage supply from providing the full operational voltage to the direct current data bus to prevent damage to the motor or the controller, for example.
    Type: Grant
    Filed: May 31, 2012
    Date of Patent: March 22, 2016
    Assignee: DEERE & COMPANY
    Inventors: Whitney M. Aalund, Alan K. Gilman, Long Wu
  • Patent number: 9281774
    Abstract: A motor control system includes: a power supply; a converter; an inverter; an alternating-current motor; and a control unit that drives the motor in any one of sinusoidal PWM control, overmodulation control and rectangular wave control through operation control of the converter and the inverter. The control unit starts step-up operation of the converter when a current vector of motor current of the motor on a d-q coordinate plane becomes a current phase corresponding to motor torque, at which a system loss is equal between before and after starting the step-up operation, while the control unit supplies the direct-current voltage, supplied from the power supply, to the inverter without stepping up the direct-current voltage by the converter and performs the rectangular wave control of the motor in a state where the current phase is an optimal current phase.
    Type: Grant
    Filed: September 5, 2012
    Date of Patent: March 8, 2016
    Inventors: Kenji Yamada, Yasuhiro Nakai
  • Patent number: 9225280
    Abstract: A carrier frequency setting unit sets a carrier frequency based on a torque command and a motor rotation number of a motor generator. A PWM signal producing unit produces phase modulated waves corresponding to respective phase voltage commands, and produces respective phase PWM signals corresponding to a relationship in magnitude between the respective phase modulated waves and a carrier having the carrier frequency. A PWM center control unit produces a PWM center correction value for variably controlling the PWM center when the carrier frequency is lower than a predetermined frequency, and provides the same to the PWM signal producing unit.
    Type: Grant
    Filed: December 22, 2008
    Date of Patent: December 29, 2015
    Inventors: Masaki Okamura, Natsuki Nozawa, Hideto Hanada
  • Patent number: 9212030
    Abstract: Energy efficiency settings for an elevator installation can be determined based on, for example, a start floor for a trip, a destination floor for a trip, user identity information and/or a condition associated with one or more users. In at least some cases, portions of a building (e.g., one or more floors) are associated with one or more energy settings. In further cases, an occupant of a building is associated with one or more elevator energy settings. Some embodiments can be used with an escalator installation.
    Type: Grant
    Filed: August 28, 2012
    Date of Patent: December 15, 2015
    Assignee: Inventio AG
    Inventor: Lukas Finschi
  • Patent number: 9197122
    Abstract: A load drive circuit may include a DC power source configured to provide a DC output voltage for at least one load based on an output voltage of an AC/DC converter, the DC output voltage having a ripple, a variable resistance module connected to the load, a ripple reduction module that generates, based on a reference voltage and a feedback signal from the load, a variable resistance adjusting signal for adjusting the resistance of the variable resistance module so as to reduce a ripple of the load current, wherein the reference voltage is generated based on the DC output voltage, and a reference voltage adjusting module that adjusts the average value of the reference voltage based on the variable resistance adjusting signal, so as to make the average value of the reference voltage approach the average value of the feedback signal as much as possible.
    Type: Grant
    Filed: May 8, 2013
    Date of Patent: November 24, 2015
    Assignee: OSRAM GmbH
    Inventors: Xusheng Yang, Shaoping Chen, Xiongqiang He, Qingfu Zhang
  • Patent number: 9172317
    Abstract: An apparatus for controlling a multi-winding rotary machine including an armature formed of a plurality of winding sets. In the apparatus, a command voltage calculator calculates command voltages to be applied to each winding set so as to control currents detected by a current detector to their respectively corresponding command currents. An interfering voltage calculator calculates, for each of the winding sets, interfering voltages proportional to the rotation speed of the rotary machine. An interfering voltage compensator compensates, for each of the winding sets, the command voltages for their respectively corresponding interfering voltages. An operation unit operates a voltage applicator to apply output values of the interfering voltage compensator to each winding set.
    Type: Grant
    Filed: January 16, 2014
    Date of Patent: October 27, 2015
    Inventors: Jun Ishida, Tomoya Takahashi
  • Patent number: 9106157
    Abstract: This invention relates to a method for generating switching signals for inverters using wavelet basis functions as a means to determine switching times, pulse duration, shifting and scale; and to a three phase, six pulse wavelet modulated inverter employing the method as a switching technique.
    Type: Grant
    Filed: May 26, 2011
    Date of Patent: August 11, 2015
    Inventors: Saleh A. M. Saleh, Azizur Rahman, Cecilia Rose Moloney
  • Patent number: 9077277
    Abstract: An electrical consumer of an aircraft comprises an electric motor and an inverter for producing an alternating voltage for the electric motor. A method for controlling the electrical consumer comprises determining a rotational frequency for the electric motor. The method also includes establishing whether the rotational frequency leads to oscillations in the input current of the inverter which are below a predefined threshold, the oscillations being produced by the inverter when producing a supply voltage for the electric motor, and changing the rotational frequency if it has been established that the rotational frequency leads to oscillations below the predefined threshold.
    Type: Grant
    Filed: November 27, 2012
    Date of Patent: July 7, 2015
    Inventors: Jens Schult, Henning Everth
  • Patent number: 9024569
    Abstract: A system and method for determining a rotor time constant of an AC induction machine is disclosed. During operation of the induction motor, a flux signal is injected into a rotor flux command so as to generate a time-variant rotor flux. A voltage-current flux observer determines amplitudes of rotor flux variations resulting from the time-variant rotor flux, with the amplitudes of the rotor flux variations comprising an amplitude of a rotor flux variation based on a current model of the voltage-current flux observer and an amplitude of a rotor flux variation based on a combined voltage-current model of the voltage-current flux observer. A rotor time constant of the induction motor is then estimated based on the determined amplitudes of the rotor flux variations.
    Type: Grant
    Filed: June 28, 2013
    Date of Patent: May 5, 2015
    Assignee: Eaton Corporation
    Inventors: Kai Wang, Wenxi Yao, Huaqiang Li, Zhengyu Lu
  • Patent number: 9024563
    Abstract: A pitch drive circuit that operates in an emergency mode, for a wind or water power plant. The circuit has at least one rectifier unit, at least one DC intermediate circuit, two inverter units and a pitch rotary current motor with motor trains that can be contacted on both sides. A first contact side of the motor trains is connected to a first inverter unit and a second contact side of the motor trains is connected to a second inverter unit. At least one switching element is connected to at least one contact side of the motor trains. In a normal operating mode of a first switching state of the switching element the motor trains can be energized via both inverter units, and in an emergency operating mode of a second switching state of the switching element, the motor trains can be energized via a single inverter unit.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: May 5, 2015
    Assignee: LTi REEnergy GmbH
    Inventors: Andreas Bünte, Harald Wertz, Christian Kleinen, Harry Gill
  • Patent number: 9024568
    Abstract: A motor speed controller controls a motor speed to generate a phase reference pulse; generates a FG pulse per rotary angle of the motor; detects a difference between the number of phase reference pulses and the number of FG pulses for output as an integer number phase difference; detects and measures a time difference between an edge of the phase-reference pulse and an edge of the FG pulse in units of the reference clock for output as a decimal fraction phase difference; adds the integer number phase difference to the decimal fraction phase difference at a predetermined ratio for output as a phase difference; and controls driving of the motor in accordance with the phase difference.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: May 5, 2015
    Assignee: Ricoh Company, Ltd.
    Inventor: Haruyuki Suzuki
  • Patent number: 9013136
    Abstract: A three-phase AC motor (4) has a configuration in which a q-axis inductance is larger than a d-axis inductance by a predetermined amount or more to allow smoothing of power fluctuations due to the power supply voltage of the AC power source (3).
    Type: Grant
    Filed: September 29, 2010
    Date of Patent: April 21, 2015
    Assignee: Daikin Industries, Ltd.
    Inventors: Akio Yamagiwa, Toshinari Kondou, Yoshihito Sanga
  • Patent number: 9007014
    Abstract: A method for minimizing power losses in an alternating current (AC) machine is provided. The method includes determining a first rotor flux signal based on signals of voltage and current inputs to the AC machine, and extracting a ripple component of the rotor flux signal. The method further includes determining a power compensating value that corresponds to a stored energy value of the AC machine, determining a second rotor flux signal that serves to minimize power losses, and providing the second rotor flux signal to a power inverting unit that adjust accordingly the voltage and current input signals provided to the AC machine.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: April 14, 2015
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Ali M. Bazzi, Philip T. Krein
  • Patent number: 8988034
    Abstract: A drive system for an electric motor includes a connection for a battery, and an inverter having an input side connected to an intermediate circuit and an output side having a connection for an electric motor. The intermediate circuit includes a first thyristor connected in parallel with an intermediate circuit capacitance. The drive system may also include a rectifier having an input side connected at the output side of the inverter in parallel with the electric motor, and a second thyristor connected an output side of the rectifier. The first/second thyristor are configured to be activated by a monitor incorporated in or assigned to the drive system. In the event of a malfunction, the input and/or output side of the inverter can be electrically isolated to allow a multiply redundant armature short circuit.
    Type: Grant
    Filed: July 17, 2012
    Date of Patent: March 24, 2015
    Assignee: Siemens Aktiengesellschaft
    Inventors: Hans-Georg Köpken, Günter Schwesig