Induction Motor Systems Patents (Class 318/727)
  • Patent number: 10804836
    Abstract: A system for controlling an AC motor is provided. The system comprises an electrical connection path for connecting an electrical input of the AC motor to a first phase of alternating current from an electric power supply. The system also comprises two or more motor controllers, each motor controller is located on the electrical connection path between the electric power supply and the AC motor and is operable to regulate current of the first phase passing through it. Each motor controller is connected in parallel, relative to the other motor controllers, to the electrical connection path. At least one processor is configured to control the motor controllers to repeatedly change which of the motor controllers current of the first phase passes through, such that at any given time current of the first phase only passes through one of the motor controllers. A corresponding method is also provided.
    Type: Grant
    Filed: December 16, 2016
    Date of Patent: October 13, 2020
    Assignee: MOTORTRONICS UK LIMITED
    Inventor: Gary Stephens
  • Patent number: 10768585
    Abstract: A control system controls a machine according to a control policy parameterized on a lifted state space of the machine having an unknown onto mapping to a state space of the machine. The control system accepts measurements of state variables that form a portion of the state of the machine and determines a derivative of at least one measured state variable using values of the state variable measured for multiple time instances, such that a combination of the measured state variables and the derivative of the at least one measured state variable defines the lifted state for the time instance. The control system updates the control policy by evaluating a value function of the control policy using the lifted states, such that a control input to the machine is determined using the lifted state and the updated control policy.
    Type: Grant
    Filed: June 13, 2018
    Date of Patent: September 8, 2020
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventor: Yebin Wang
  • Patent number: 10763770
    Abstract: Operating an asynchronous machine includes: closed loop control of a first and a second three-phase winding by a first and a second closed loop control method, respectively. The second closed loop control method supplies a voltage vector to a second inverter device, and changes from the first closed loop control method to a first open loop control method. The first open loop control method includes supplying a first reference current vector to a first filter device, supplying a filtered first reference current vector to a calculation device for calculating an electrical angle, supplying the electrical angle to a first transformation device for transforming a first open loop control deviation vector, transforming a first open loop control deviation vector into a third voltage vector, and supplying the third voltage vector to the first inverter device for the operation of the first three-phase winding.
    Type: Grant
    Filed: May 15, 2019
    Date of Patent: September 1, 2020
    Assignee: ZF Friedrichshafen AG
    Inventor: Hassan Lamsahel
  • Patent number: 10658961
    Abstract: A method for identifying the discrete instantaneous angular speed of electromechanical systems in which electrical rotating machinery is used and in which at least one electrical signal is measured during an operation of the electromechanical system. The method includes measuring analog stator current signals and analog stator voltage signals for at least one phase A, B, C, converting the measurements into a digital discrete form, transmitting the digital discrete signals to a computer device wherein data analysis is performed in a processor unit on the basis of a simplified mathematical model of the dynamics of the motor or generator. During the data analysis an average rotor time constant is calculated, an average supply frequency value is identified, an average angular speed is obtained, and an instantaneous phase difference between the discrete stator current signals and the discrete stator voltage signals is determined.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: May 19, 2020
    Assignee: ABB Schweiz AG
    Inventor: James Ottewill
  • Patent number: 10655542
    Abstract: In one embodiment, a system includes a drive train starter system. The drive train starter system includes a generator mechanically coupled to a drive train of a gas turbine system and an exciter system electrically coupled to the generator and configured to provide a magnetic field. The drive train starter system additionally includes a load commutated inverter (LCI) electrically coupled to the generator and configured to provide electrical power to the generator and a controller communicatively coupled to the generator, the exciter system, and the LCI. The controller is configured to start up the drive train via the LCI and the generator up to less than a drive train operating speed, wherein the generator is converting electricity into mechanical motion; drive the drive train via a gas turbine up to the drive train operating speed; and to drive the drive train via the generator at the drive train operating speed.
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: May 19, 2020
    Assignees: General Electric Company, ExxonMobil Upstream Research Company
    Inventors: Brian Allen Rittenhouse, Karl Dean Minto
  • Patent number: 10651700
    Abstract: In this rotating electrical machine, each of coil centers of a first concentric coil and a third concentric coil is located on one side in a circumferential direction with respect to a center of a magnetic pole, and each of coil centers of a second concentric coil and a fourth concentric coil is located on the other side in the circumferential direction with respect to the center of the magnetic pole.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: May 12, 2020
    Assignee: AISIN AW & CO., LTD.
    Inventor: Kiyotaka Koga
  • Patent number: 10606220
    Abstract: A closed-loop control device includes a target value entrance for inputting a target value for at least one control value, an actual value entrance for inputting an actual value for the at least one control value, wherein the actual value is determined based on the at least one measuring value, a calculation unit for calculating the actuation value based on a deviation of the actual value from the target value in such a way that the actual value follows the target value, and a control exit for outputting the actuation value for an actuator of the at least one tempering circle. The calculation unit is configured in such a way that the actuation value is calculated based on the present operating point or in a manner adapted to the present operating point.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: March 31, 2020
    Assignee: ENGEL AUSTRIA GMBH
    Inventor: Hannes Bernhard
  • Patent number: 10536105
    Abstract: A power conversion apparatus having a converter, an inverter controlled by inverter controller, and an input power source fluctuation detecting and controlling circuit is proposed. The input power source fluctuation detecting and controlling circuit includes an input power source fluctuation detector and a converter failure detector to detect overcurrent and/or overvoltage of the converter. When both of the input power source fluctuation and the converter failure are detected, the converter is gate blocked, and the inverter continues its operation, and when the DC voltage become lower than a threshold voltage during the converter is gate blocking, the input power source fluctuation detecting and controlling circuit outputs an inverter control changeover flag to the inverter controller for switching a contents of inverter control.
    Type: Grant
    Filed: April 23, 2018
    Date of Patent: January 14, 2020
    Assignee: Toshiba Mitsubishi-Electric Industrial Systems Corporation
    Inventors: Shunsuke Tobayashi, Toshiaki Oka
  • Patent number: 10523137
    Abstract: Provided is a wire connecting structure of coils of a three-phase motor, a wire connecting method and three-phase motor, which is capable of reducing a size of a short circuit terminal for a neutral point. The wire connecting structure is a wire connecting structure of coils which are wound to each salient-pole in a three-phase motor having respective salient-pole of a U phase, a V phase and a W phase, the coils of the salient-poles belonging to any two phases among the U phase, the V phase and the W phase are formed by a single continuous first conducting wire, and the coil of the salient-pole belonging to the rest one phase is formed by a single continuous second conducting wire.
    Type: Grant
    Filed: June 27, 2018
    Date of Patent: December 31, 2019
    Assignee: NIDEC SANKYO CORPORATION
    Inventor: Naoya Isaji
  • Patent number: 10514274
    Abstract: Provided is a device for estimating a rotor angle in a motor. The device includes a sensor configured to measure a rotation angle “?in” of a motor including a pulsation, a D-Q converter configured to convert the rotation angle “?in” into a D-axis conversion angle, and a phase-locked loop (PLL) block configured to perform proportional integral control on the D-axis conversion angle according to a PLL algorithm to estimate a rotation angle “?out” from which the pulsation has been removed.
    Type: Grant
    Filed: June 28, 2017
    Date of Patent: December 24, 2019
    Assignee: Hyundai Mobis Co., Ltd.
    Inventor: Sang Min Kim
  • Patent number: 10461537
    Abstract: A method for operating an unbalanced load manager for a three-phase induction motor or heater, includes receiving, by a load manager, values representative of current flow sensed by current sensors and voltages sensed by voltage taps corresponding to phases of a three-phase power system providing power to the motor or heater. The method includes detecting, by the load manager, a transition from positive or negative to zero current, to measure a phase shift between line-to-line and current. The method further includes synchronizing, by the load manager, firing from line-to-line signal to line-to-neutral signal of phases of the three-phase power system, using the measured phase shift between line-to-line and current.
    Type: Grant
    Filed: December 19, 2017
    Date of Patent: October 29, 2019
    Assignee: EUROTHERM LIMITED
    Inventor: Remi Cabaussel
  • Patent number: 10439536
    Abstract: An initial position estimating apparatus for estimating an initial position of a rotor of a motor includes: a signal processor for outputting an angular error component from a change amount of a q-axis current in an estimated rotor reference frame; a position estimator for estimating an electrical position of the rotor from the angular error component; a magnetic pole determination portion for outputting magnetic pole determination information according to a sign of a magnetic pole determination signal determined based on a change amount of a d-axis current in the estimated rotor reference frame and based on a d-axis voltage; and a first addition portion for outputting an initial position of the rotor by adding the magnetic pole determination information to the electrical position.
    Type: Grant
    Filed: December 27, 2017
    Date of Patent: October 8, 2019
    Assignee: LSIS CO., LTD.
    Inventor: Hakjun Lee
  • Patent number: 10312847
    Abstract: Methods and apparatus to control a three-phase BLDC motor using phase current and phase voltage at zero current detection and a driving current derived from a bus current, for example. The driving current can be combined with a difference angle with an output provided to a controller to control a speed of the motor.
    Type: Grant
    Filed: May 9, 2016
    Date of Patent: June 4, 2019
    Assignee: ALLEGRO MICROSYSTEMS, LLC
    Inventor: Yisong Lu
  • Patent number: 10218296
    Abstract: Implementations of methods for sensing rotor positions of a motor may include coupling a controller with a PMSM and applying, using the controller, a plurality of vectors to the PMSM, the plurality of vectors including a plurality of dummy vectors and a plurality of measured vectors, wherein at least one measured vector is applied quadrature to a dummy vector from the plurality of dummy vectors immediately preceding each measured vector. The method may also include measuring, with a measurement circuit, a plurality of values from a three-phase inverter coupled with the PMSM, each value of the plurality of values corresponding with one of the plurality of measured vectors, and calculating, with one or more logic elements coupled with the PMSM, based on the plurality of values and using one or more position algorithms, a position of a rotor of the PMSM relative to a stator of the PMSM.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: February 26, 2019
    Assignee: SEMICONDUCTOR COMPONENTS INDUSTRIES, LLC
    Inventors: Masanori Okubayashi, Kazumasa Takai
  • Patent number: 10193482
    Abstract: In a method for reducing noise of a motor fed by a converter, a magnetic flux in the motor is changed for reducing a fundamental oscillation and a harmonic oscillation of the magnetic flux, and a degree of control and/or a pulse frequency of the converter is changed so as to change a harmonic oscillation of the magnetic flux.
    Type: Grant
    Filed: February 9, 2016
    Date of Patent: January 29, 2019
    Assignee: Siemens Aktiengesellschaft
    Inventors: Peter Köllensperger, Ioannis Tsoumas
  • Patent number: 10181773
    Abstract: A detection device and a detection method of a rotor position of three-phase motor are disclosed which measure induced voltages under different voltage vectors and calculate an induced voltage relationship among the different induced voltages. Then the detection device and the detection method find out the rotor position suitable for the induced voltage relationship according to a rotor position table. Therefore, the detection device and the detection method can accurately detect the rotor position in a standstill state to prevent the three-phase motor from operating abnormally and burning out.
    Type: Grant
    Filed: February 27, 2018
    Date of Patent: January 15, 2019
    Assignee: ANPEC ELECTRONICS CORPORATION
    Inventor: Yi-Cheng Liu
  • Patent number: 10171019
    Abstract: A controller includes a torque command value calculation module configured to calculate a torque command based on a speed command of the motor, an output voltage controlling module configured to control an output voltage of the power converter based on the torque command calculated by the torque command value calculation module, a voltage command value correcting module configured to correct a voltage command to the power converter based on a measured output voltage from the power converter, a flux estimation module configured to estimate stator flux and rotor flux of the motor in a subsequent control period based on the voltage command by the voltage command value correcting module and a measured current of the stator and a motor speed estimation module configured to estimate a speed of the motor in a subsequent control period based on the flux estimated by the flux estimation module.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: January 1, 2019
    Assignees: Toshiba Mitsubishi-Electric Industrial Systems Corporation, Wisconsin Alumni Research Foundation
    Inventors: Yang Xu, Ryo Iida, Robert D. Lorenz, Yukai Wang
  • Patent number: 10153720
    Abstract: A power supply system for an electric vehicle includes a battery, an inverter configured to supply alternating-current electric power to a motor for traveling, a first voltage converter connected between the battery and the inverter, a second voltage converter connected in parallel with the first voltage converter, a temperature acquisition unit configured to acquire a temperature of the first voltage converter, a current acquisition unit configured to acquire magnitude of a current flowing in the second voltage converter, and a controller. Each of the first voltage converter and the second voltage converter includes two switching elements, two diodes, and a reactor.
    Type: Grant
    Filed: December 15, 2017
    Date of Patent: December 11, 2018
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Wataru Nakayama
  • Patent number: 10097130
    Abstract: An energization control system includes a sensor unit including a magnetic detection portion detecting a magnetic flux density of a magnetic flux generated at a surrounding of a conductor in response to a current flowing in the conductor of an electrical apparatus, a temperature detection portion detecting a temperature level within a package in which the magnetic detection portion is disposed, a correction portion correcting a temperature characteristic of a detection result of the magnetic detection portion based on the detected temperature level, and an output portion outputting temperature information indicating the detected temperature level. The energization control system further includes a control unit including a control portion controlling a current flowing in a heating element of the electrical apparatus based on the temperature information.
    Type: Grant
    Filed: November 30, 2016
    Date of Patent: October 9, 2018
    Assignee: AISIN SEIKI KABUSHIKI KAISHA
    Inventors: Mamoru Tsuda, Ken Okumura, Hiromu Kinoshita
  • Patent number: 10071761
    Abstract: A first-stage phase compensator, a second-stage phase compensator, and a third-stage phase compensator are configured in such a way that a frequency at which a phase calculated through the transfer function of the first-stage phase compensator becomes maximal and a frequency at which a phase calculated through a transfer function of the first-stage phase compensator and the third-stage phase compensator becomes maximal coincide with each other; a motor for generating assist torque is controlled, based on a torque signal to which the first-stage phase compensator, the second-stage phase compensator, and the third-stage phase compensator have applied phase compensation.
    Type: Grant
    Filed: April 21, 2014
    Date of Patent: September 11, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Munenori Yamamoto, Tomoya Iida, Yosuke Ayukawa
  • Patent number: 9952545
    Abstract: A motor control apparatus that performs a drive control of a motor includes a current detector configured to detect a driving current flowing in a winding of the motor, a calculator configured to calculate an estimated value indicating a rotational position of a rotor of the motor by an estimation computation based on a value of the driving current detected by the current detector, and a corrector configured to correct the estimated value of the rotational position based on a rotation amount of the rotor in a predetermined period from a start of the estimation computation by the calculator until completion of the estimation computation. In addition, a controller controls the driving current flowing in the winding of the motor so that a deviation between the estimated value corrected by the corrector and an instructed value indicating a target position of the rotor is reduced.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: April 24, 2018
    Assignee: Canon Kabushiki Kaisha
    Inventor: Yuta Nito
  • Patent number: 9906162
    Abstract: A method is provided to control the output voltage across an unbalanced load connected to a three-phase inverter, The method includes transformation of a set of three-phase voltage signals to a dq-coordinate system. Based on the transformation, a set of d-axis and a set of q-axis positive, negative and a set of zero sequence signals are generated. The method includes phase shifting of each of the zero sequence signals to generate 120 degrees and 240 degrees phase shifted zero sequence signals. Each of the zero sequence signals, the 120 degrees and the 240 degrees phase shifted zero sequence signals are transformed to a set of d-axis and q-axis zero sequence signals. A set of error signals, calculated based on the set of d-axis and q-axis zero, positive and negative sequence signals, are minimized and transformed to abc-coordinate system to obtain a three-phase control voltage signal.
    Type: Grant
    Filed: April 29, 2016
    Date of Patent: February 27, 2018
    Assignee: Caterpillar Inc.
    Inventors: Dachuan Yu, Osama M. Alkhouli
  • Patent number: 9843277
    Abstract: A motor controller that is configured to switch power supply phases of the motor, to perform a limit-position abutment control by rotating the motor to a movable limit of a movable range of the rotation object to learn a reference position of the motor, perform a power-saving return control afterwards, in which a power supply to the motor is stopped, thereby returning a rotation position of the motor toward a target rotation position, and stop the rotation of the motor by simultaneously supplying power to a preset phase of the motor, when the rotation position of the motor reaches the target rotation position. In such manner, the power consumption as well as the heat generation of the motor are reduced for returning the rotation position of the motor to a preset rotation position after the abutment control of the motor.
    Type: Grant
    Filed: November 6, 2015
    Date of Patent: December 12, 2017
    Assignee: DENSO CORPORATION
    Inventor: Jun Yamada
  • Patent number: 9813001
    Abstract: A control device capable of suppressing electromagnetic force applied to a motor has a harmonic current calculation section and an operation section. The harmonic current calculation section calculates amplitude and phase of each of harmonic currents to be superimposed over a fundamental current which flows in phase windings of a stator of the motor based on conditions relating to load change of the motor. The operation section generates and transmits instruction signals to an inverter so that the calculated superimposed harmonic currents flow in the phase windings of the stator.
    Type: Grant
    Filed: May 20, 2016
    Date of Patent: November 7, 2017
    Assignees: DENSO CORPORATION, ASMO CO., LTD.
    Inventors: Ryunosuke Akimatsu, Tatsuya Tonari, Toshihiro Uchida
  • Patent number: 9812940
    Abstract: In an embodiment, an offset voltage generator includes a first limiter configured to compare a first phase-voltage signal with a maximum limit value and a minimum limit value to output a first limit-voltage signal; a second limiter configured to compare a second phase-voltage signal with the maximum limit value and the minimum limit value to output a second limit-voltage signal; a third limiter configured to compare a third phase-voltage signal with the maximum limit value and the minimum limit value to output a third limit-voltage signal; and a summer configured to add a difference between the first phase-voltage signal and the first limit-voltage signal, a difference between the second phase-voltage signal and the second limit-voltage signal, and a difference between the third phase-voltage signal and the third limit-voltage signal, to output an offset voltage.
    Type: Grant
    Filed: April 13, 2016
    Date of Patent: November 7, 2017
    Assignee: LSIS CO., LTD.
    Inventors: Hak-Jun Lee, An-No Yoo
  • Patent number: 9806652
    Abstract: In some embodiments, a system of controlling an induction electric motor, includes a command voltage output unit for generating a command voltage for operating an inverter according to a command speed and outputting the generated command voltage to the inverter; a control unit for controlling the command voltage output unit such that the command voltage output to the inverter is compared with an operation limiting voltage and the command voltage is corrected to fall within the operation limiting voltage; and the inverter for controlling the induction electric motor depending on the corrected command voltage. Thus, it is possible to precisely control the induction electric motor even in a high speed operation region by regulating the magnitude of the command voltage applied to the induction electric motor by means of dynamic modulation strategies without the magnetic flux controller.
    Type: Grant
    Filed: May 25, 2016
    Date of Patent: October 31, 2017
    Assignee: LSIS CO., LTD.
    Inventors: Joo-Young Moon, Hak-Jun Lee, Anno Yoo
  • Patent number: 9800186
    Abstract: A magnetoelectric device capable of storing usable electrical energy includes an inductive servo control unit and a motor. The motor includes a rotor and three ferromagnetic-core coils disposed around the rotor. The inductive servo control unit executes individual phase control on the three-phase induction motor to magnetize the ferromagnetic-core coils with respective phases. When each of the ferromagnetic-core coils is demagnetized, it generates a current due to counter-electromotive force to charge a damping capacitor.
    Type: Grant
    Filed: February 2, 2016
    Date of Patent: October 24, 2017
    Inventors: Fu-Tzu Hsu, Chieh-Sen Tu
  • Patent number: 9787236
    Abstract: A system and method for dynamically optimizing flux levels in electric motors based on estimated torque. Motor parameters and motor equations are used to estimate operating characteristics and to set current and voltage limits which define an optimal flux operating range for a given speed and torque of the motor. A slope of a linear flux gain is determined within the defined operating range at different speeds of the motor. The determined slopes for the different speeds are saved in a memory element. A control element determines and achieves an optimal flux level for the motor by accessing the table to identify a specific slope which corresponds to an actual speed of the motor, multiplying the slope by the estimated torque and adding an offset value to determine a phase current component value associated with the optimal flux level, and applying the determined phase current component value to the motor.
    Type: Grant
    Filed: October 28, 2016
    Date of Patent: October 10, 2017
    Assignee: Nidec Motor Corporation
    Inventor: Thomas J. Sheahan
  • Patent number: 9754204
    Abstract: An example method for controlling an AC electrical machine can include providing a PWM converter operably connected between an electrical power source and the AC electrical machine and providing a neural network vector control system operably connected to the PWM converter. The control system can include a current-loop neural network configured to receive a plurality of inputs. The current-loop neural network can be configured to optimize the compensating dq-control voltage. The inputs can be d- and q-axis currents, d- and q-axis error signals, predicted d- and q-axis current signals, and a feedback compensating dq-control voltage. The d- and q-axis error signals can be a difference between the d- and q-axis currents and reference d- and q-axis currents, respectively. The method can further include outputting a compensating dq-control voltage from the current-loop neural network and controlling the PWM converter using the compensating dq-control voltage.
    Type: Grant
    Filed: August 5, 2014
    Date of Patent: September 5, 2017
    Assignee: Board of Trustees of The University of Alabama
    Inventors: Shuhui Li, Michael Fairbank, Xingang Fu, Donald Wunsch, Eduardo Alonso
  • Patent number: 9729097
    Abstract: An apparatus for controlling an induction motor is provided, the apparatus generates generating a d-axis current command and a q-axis current command of a torque command, estimating speed of a rotor of the motor, and correcting the d-axis and q-axis current commands by using the estimated speed, to enhances the rotor speed and position estimation performance by increasing the slip frequency.
    Type: Grant
    Filed: April 20, 2015
    Date of Patent: August 8, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Anno Yoo
  • Patent number: 9729099
    Abstract: A method and apparatus are provided for controlling a sensorless alternating current induction motor (ACIM) having a rotor and a stator comprising a plurality of stator windings by applying a plurality of phase shifted voltages to the plurality of stator windings in the ACIM such that two energized stator windings are connected to first and second phase shifted voltages to cause rotation of the rotor relative to the stator while a third unconnected stator winding is floating so that a DC bus current and an inducted voltage can be measured from the ACIM and used to compute an estimated rotor speed.
    Type: Grant
    Filed: May 19, 2016
    Date of Patent: August 8, 2017
    Assignee: NXP USA, Inc.
    Inventors: Ivan Lovas, Pavel Sustek, Petr Staszko
  • Patent number: 9722488
    Abstract: Disclosed herein is a technique for substantially preventing, in a power converter including a boost power factor correction section, the power factor correction section from starting an intermittent operation even if the ripple voltage of its smoothing capacitor has increased. The converter includes: a power factor correction section including a booster circuit boosting an input voltage supplied from a rectifier section and a smoothing capacitor smoothing an output of the booster circuit; and a control section correcting a power factor by controlling the booster circuit. The control section makes correction to the amount of boost of the booster circuit such that an output voltage of the smoothing capacitor does not become lower than the input voltage.
    Type: Grant
    Filed: August 27, 2014
    Date of Patent: August 1, 2017
    Assignee: Daikin Industries, Ltd.
    Inventors: Shinichi Ishizeki, Kentarou Taoka, Masahide Fujiwara
  • Patent number: 9656569
    Abstract: A vehicle power source apparatus is provided with a driving battery mounted in a vehicle, an auxiliary apparatus battery that supplies electric power to an auxiliary apparatus of the vehicle, a DC power conversion unit that supplies electric power from the driving battery to the auxiliary apparatus battery, a control unit that controls the DC power conversion unit, a driving battery harness that connects the driving battery with the DC power conversion unit and is protected by a shield, an auxiliary apparatus battery negative-side harness that connects the DC power conversion unit with the negative side of the auxiliary apparatus battery, and a voltage sensor that detects a connection abnormality in the auxiliary apparatus battery negative-side harness.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: May 23, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Mamoru Takikita, Youhei Matsuda
  • Patent number: 9654042
    Abstract: An apparatus for controlling an induction motor is provided, the apparatus generates generating a d-axis current command and a q-axis current command of a torque command, estimating speed of a rotor of the motor, and correcting the d-axis and q-axis current commands by using the estimated speed, to enhances the rotor speed and position estimation performance by increasing the slip frequency.
    Type: Grant
    Filed: April 20, 2015
    Date of Patent: May 16, 2017
    Assignee: LSIS CO., LTD.
    Inventor: Anno Yoo
  • Patent number: 9634588
    Abstract: A device and a method of 6-step controlling of an inverter of a motor driving system are provided. The device and method and apply a voltage to a motor by adopting a 6-step control scheme capable of maximally using an input voltage of the inverter to improve output efficiency of the inverter and the motor and thus improve fuel efficiency of an environmentally friendly vehicle.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: April 25, 2017
    Assignees: Hyundai Motor Company, Kia Motors Corporation
    Inventors: Hong Geuk Park, Mu Shin Kwak, Sung Kyu Kim, Su Hyun Bae
  • Patent number: 9614472
    Abstract: The electric machine comprises at least one winding made of a material having a temperature dependent resistance. The temperature of the winding is monitored using the resistance therein. Temperatures or resistances indicative of a fault can be sensed, and corrective action taken, without the need for dedicated temperature sensors.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: April 4, 2017
    Assignee: PRATT & WHITNEY CANADA CORP.
    Inventor: Kevin Allan Dooley
  • Patent number: 9614467
    Abstract: The voltage amplification factor during rapid deceleration control of a motor is set to a value obtained by adding a first voltage amplification factor calculated with reference to the voltage of the DC circuit section of the inverter using a predetermined function and a low-pass filter and a second voltage amplification factor calculated with reference to the inverter current using a PI control. And both calculations are performed in parallel.
    Type: Grant
    Filed: October 30, 2013
    Date of Patent: April 4, 2017
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kenji Takahashi, Shinichi Furutani, Naoto Norina
  • Patent number: 9543875
    Abstract: A motor control device is provided, which includes a power converter for applying output voltage according to a voltage command to an electric motor, a magnetic flux estimator for estimating a vector of stator magnetic flux of the electric motor based on a difference between the output voltage and a voltage drop caused by a coil resistance of the electric motor, and a phase estimator for estimating a phase of the stator magnetic flux based on the vector of the stator magnetic flux estimated by the magnetic flux estimator. The magnetic flux estimator includes a variable low-pass filter for applying a low-pass filter to the difference at a cut-off frequency according to a frequency of the output voltage, and a phase adjuster for retarding at least one of an output phase of the variable low-pass filter and a phase of the difference before inputted into the variable low-pass filter.
    Type: Grant
    Filed: July 28, 2015
    Date of Patent: January 10, 2017
    Assignee: KABUSHIKI KAISHA YASKAWA DENKI
    Inventors: Akira Yamazaki, Shingo Fukumaru
  • Patent number: 9461565
    Abstract: A system for soft starting a large AC motor may include a variable frequency drive (VFD) having a much lower voltage rating than the rated voltage of the AC motor. The VFD's voltage rating may be in a range of about 33% to about 67% of the AC motor's rated voltage. The AC motor may be coupled to a utility power source via conventional connections to leads of the AC motor's windings. The VFD may be connected to the AC motor via tapped connections within the windings of the AC motor such that the tap voltages are much less than the AC motor's rated voltage. A less expensive VFD may therefore be used to soft start the AC motor instead of a VFD having the same rated voltage as the AC motor. Methods of starting large AC motors with a VFD are also provided, as are other aspects.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: October 4, 2016
    Assignee: SIEMENS AKTIENGESELLSCHAFT
    Inventor: Richard H. Osman
  • Patent number: 9450530
    Abstract: A method of controlling operation of a multi-phase induction motor may include transmitting a low-speed operation signal by a master computer to a control signal board for low-speed operation of the motor; the control signal board receiving the low-speed operation signal, and in response to the low-speed operation signal, the control signal board sensing that the master computer is not simultaneously transmitting a high-speed operation signal, and in response to receiving the low-speed operation signal and not simultaneously receiving the high-speed operation signal, closing contactors in a power section to transmit power to the motor for low-speed operation, whereby the motor is connected to a source of multi-phase power and operates at low-speed; and the control signal board transmitting a first feedback signal to the master computer that the motor is connected to the source of multi-phase power and is running at low speed.
    Type: Grant
    Filed: January 23, 2014
    Date of Patent: September 20, 2016
    Assignee: DAYTON-PHOENIX GROUP, INC.
    Inventors: Joseph A. Zahora, Xung T. Bui, Brad S. Bryant
  • Patent number: 9425721
    Abstract: A system including memory to store a plurality of sets of values, where each set is used to control speed of a different type of motor. A pulse width modulation (PWM) module receives an input indicating a type of motor sensed in the system, selects a set corresponding to the type of the sensed motor, and generates, based on the selected set, a pulse width modulation signal to control speed of the sensed motor. A speed module receives a requested speed for the sensed motor and generates an output indicating a range of speed corresponding to the requested speed. The PWM module selects, based on the range of speed, a value from the selected set; shifts, based on the selected value, the pulse width modulation signal; and adjusts, based on the shifted pulse width modulation signal, the speed of the sensed motor by adjusting torque applied to the sensed motor.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: August 23, 2016
    Assignee: Marvell World Trade LTD.
    Inventors: Ravishanker Krishnamoorthy, Edy Susanto, Cheng Yong Teoh, Foo Leng Leong
  • Patent number: 9407181
    Abstract: A control device stores, as a dead time Td, a period from a point of time of a switching-off operation of an inverter to a point of time when an inverter output voltage becomes lower than a control target value “0”. In overmodulation PWM control over the inverter, the control device performs the switching-off operation at a time t1, and thereafter starts a switching-on operation at a time t2 with passage of dead time Td read from a memory. With the setting of dead time Td, the inverter output voltage becomes lower than the control target value “0” at time t2 at which the switching-off operation is started. Hence, the inverter output voltage just after the switching-on operation is less likely to be affected by surge voltage during the switching-off operation, whereby the peak value of the inverter output voltage is made small.
    Type: Grant
    Filed: July 12, 2011
    Date of Patent: August 2, 2016
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Tomonori Furukawa
  • Patent number: 9383265
    Abstract: The invention relates to a method of determining internal temperatures (2) (coil and magnet temperatures) in a synchronous electrical machine (4) using state observers for the resistance of the coils and the magnetic flux of the magnet. The invention also relates to a diagnostic method, a control method and system (3) for controlling a synchronous electrical machine from the internal temperatures thus determined.
    Type: Grant
    Filed: May 21, 2014
    Date of Patent: July 5, 2016
    Assignee: IFP ENERGIES NOUVELLES
    Inventors: Wissam Dib, Nicolas Henwood
  • Patent number: 9379654
    Abstract: A method of estimating inductances and flux linkages of an electrical machine supplied with drive currents via current regulators. Drive current values are measured and fed back to the regulators for closed-loop control. The method includes providing one current regulator with an alternating current value either for a direct axis current reference i*d or for a quadrature axis current reference i*q of the machine current vector, while providing another current regulator with a predetermined direct current value for the remaining one of the two current references i*d and i*q. After a predetermined time, a varying signal is superimposed onto an output signal generated by the current regulator in response to the AC value. Finally, a contribution signal, which corresponds to the contribution of the superimposed varying signal to the drive currents, is determined, and the machine inductances and flux linkages are estimated on the basis of the contribution signal.
    Type: Grant
    Filed: January 31, 2014
    Date of Patent: June 28, 2016
    Assignee: ABB Technology AG
    Inventors: Luca Peretti, Dmitry Svechkarenko
  • Patent number: 9331562
    Abstract: The present invention provides a power-factor converter with nonlinear conversion ratio, wherein the power-factor converter includes a first inductor, a second inductor, a rectifier circuit and a switch circuit. The switch circuit is arranged to be switched to form a circuit equivalent to a parallel connection of the first inductor and the second inductor during an inductor-charging-phase for charging the first inductor and the second inductor in parallel by an AC power source, and form a circuit equivalent to a series connection of the first inductor L1 and the second inductor L2 during an inductor-discharging-phase for discharging the first inductor and the second inductor to the rectifier circuit in series.
    Type: Grant
    Filed: May 19, 2014
    Date of Patent: May 3, 2016
    Assignees: LITE-ON ELECTRONICS (GUANGZHOU) LIMITED, LITE-ON TECHNOLOGY CORPORATION
    Inventors: Yu-Chen Liu, Jin Chyuan Huang, Chao-Fu Wang, Yi-Fu Chen, Yu-Kang Lo, Huang-Jen Chiu
  • Patent number: 9214884
    Abstract: A motor driving device of the present invention is a motor driving device that incorporates so-called vector control of controlling a current applied to a motor winding in accordance with the position of a rotor. The motor driving device receives the input of a duty command value from a host controller via a command input port, for example. The motor driving device obtains a current command or a speed command as a command value such that the input duty command value is equal to the duty of a drive pulse output from an inverter. Then, the motor driving device performs vector control based on the obtained command value.
    Type: Grant
    Filed: April 1, 2014
    Date of Patent: December 15, 2015
    Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
    Inventors: Daisuke Sonoda, Yasushi Kato, Yasuyuki Yokouchi, Mitsuhiro Sakamoto
  • Patent number: 9171692
    Abstract: An x-ray arrangement includes a vacuum container in, which a rotary anode and a rotor of an electrical machine are disposed. The rotary anode and the rotor have a torque-proof connection to one another and are rotatably supported in the vacuum container, so that the rotary anode and the rotor are rotatable around an axis of rotation. Viewed in a direction of the axis of rotation, a laminated stator core is disposed in an area of the rotor. The area of the rotor, in relation to the axis of rotation, surrounds the vacuum container radially outwards. A stator winding system is disposed in the laminated stator core. The stator winding system has windings embodied as a yoke winding.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: October 27, 2015
    Assignee: Siemens Aktiengesellschaft
    Inventors: Andreas Baral, Andreas Rohrmoser, Carsten Voss, Thomas Weidinger
  • Patent number: 9168917
    Abstract: A cooling system circulates a coolant between an engine, an inverter and a radiator to cool the engine and the inverter. A driving mode of the vehicle can be changed between an EV-mode in which the vehicle is driven only by the motor and an HV-mode in which the vehicle is driven by at least one of the motor and the engine. When a driving mode is EV-mode, a coolant temperature is increased to cool the inverter. In the EV-mode, a vehicle is driven by motor only. When the inverter temperature is increased, the allowable current of the inverter can be increased and an allowable output of a motor can be increased.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: October 27, 2015
    Assignee: DENSO CORPORATION
    Inventor: Hiroaki Ono
  • Patent number: 9154064
    Abstract: A control device for a three-phase AC motor includes: an inverter having switching elements; current sensors for sensing a current in the motor; and a control means having a feedback control operation part for operating a voltage command of each phase and switching the switching elements based on the voltage command. When a positive and negative offset abnormality occurs, the control means executes a positive and negative offset abnormality detection process that the control means compares a value, which is obtained by integrating a variation in a voltage command of each phase over a predetermined detection interval, with a predetermined abnormality threshold value, the voltage command being outputted by the feedback control operation part with respect to a variation in the current caused by the positive and negative offset abnormality.
    Type: Grant
    Filed: September 27, 2013
    Date of Patent: October 6, 2015
    Assignee: DENSO CORPORATION
    Inventors: Takashi Suzuki, Hirofumi Kako, Takeshi Itoh
  • Patent number: 9083276
    Abstract: A stator has multi-phase stator coils that are wound around a stator core by concentrated winding. A rotor has rotor coils that are wound at multiple portions of a rotor core in the circumferential direction and diodes that serve as rectifier unit that is connected to the rotor coils and that varies the magnetic characteristics of the respective rotor coils alternately in the circumferential direction. A rotary electric machine driving system includes a decreasing/increasing pulse superimposing unit that superimposes decreasing pulse current for a pulse-shaped decrease on a q-axis current command for passing currents through the stator coils and that superimposes increasing pulse current for a pulse-shaped increase on a d-axis current command.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: July 14, 2015
    Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Eiji Yamada, Ryoji Mizutani, Kenji Hiramoto, Hideo Nakai, Norimoto Minoshima