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公开(公告)号：US20240333182A1
公开(公告)日：2024-10-03
申请号：US18576522
申请日：2021-08-24
Applicant: Mitsubishi Electric Corporation
Inventor： Kota TERAMOTO , Tetsuya KOJIMA
CPC classification number: H02P21/18 , H02P21/141 , H02P27/085
Abstract: A control device includes: a current detector that detects a stator current flowing between a voltage applicator and a stator winding of a rotary machine; a controller that computes a voltage command value based on the stator current and a rotor position, the voltage command value being a command value of a stator voltage applied to the stator winding; a PWM modulator that generates a gate signal such that a value obtained by smoothing the stator voltage matches the voltage command value, and to use this gate signal to control turning on and off of switching elements provided in the voltage applicator; a voltage integrator that computes a voltage integration value by integrating the gate signal; and a position estimator that estimates the rotor position based on the voltage integration value and the stator current.
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公开(公告)号：US20240322722A1
公开(公告)日：2024-09-26
申请号：US18577730
申请日：2021-08-24
Applicant: Mitsubishi Electric Corporation
Inventor： Kota TERAMOTO , Tetsuya KOJIMA
CPC classification number: H02P21/18 , H02P6/183 , H02P21/06 , H02P21/141 , H02P21/22 , H02P2207/05
Abstract: A control device includes a current detector that detects a stator current flowing between a voltage application unit and a stator winding of a rotating machine; a control unit that computes a voltage command value that is a command value for a stator voltage to be applied to the stator winding on the basis of the stator current and a rotor position serving as position information of a rotor of the rotating machine; a PWM modulator that performs on-off control of switching elements of the voltage application unit so that a smoothed value of the stator voltage matches the voltage command value; and a position estimator that estimates, on the basis of the voltage command value and the stator current, the rotor position through a filter that removes a frequency component of a fundamental frequency of rotational speed of the rotating machine.
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公开(公告)号：US12088231B2
公开(公告)日：2024-09-10
申请号：US17920036
申请日：2020-06-05
Applicant: Mitsubishi Electric Corporation
Inventor： Yuichiro Nakamura , Yuya Tsuchimoto
CPC classification number: H02P29/662 , H02P21/141
Abstract: A motor temperature and torque estimation device comprises: a temperature sensor; a losses estimation circuitry to estimate an iron loss; a first temperature estimation circuitry to estimate a first magnet temperature from the estimated iron loss and a sensor's detected temperature; a second temperature estimation circuitry, to input into a magnet's magnetic flux calculator thereinside motor's modified inductance, to estimate a second magnet temperature from magnet's magnetic flux calculated through voltage equations; a magnet-temperature estimation circuitry to estimate a motor's magnet temperature from the first and second magnet temperatures; a magnet's magnetic estimation circuitry to estimate magnetic flux based on the calculated/modified one, the motor's estimated magnet temperature and temperature characteristics, and to output the estimated magnetic flux into the losses estimator; and a torque estimation circuitry to estimate torque based on the estimated magnetic flux and iron loss, wherein a motor's magnet temperature(s) and torque are estimated.
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公开(公告)号：US20240243678A1
公开(公告)日：2024-07-18
申请号：US18574370
申请日：2022-06-01
Applicant: Mitsubishi Electric Corporation
CPC classification number: H02P21/13 , H02P21/141 , H02P21/18 , H02P21/26
Abstract: The present invention concerns a device and a method for controlling a motor using a maximum torque per ampere field module and a direct flux vector control module. The invention: —determines by the direct flux vector control module reference voltages in a ft framework, —drives the motor with the summed voltages, —measures a motor current vector, —determines a high frequency injection voltage so that the high frequency current response of the motor to the high frequency injection voltages is perpendicular to the measured motor current vector, —determines an estimated flux from the measured motor currents and the voltage references, —determines, from the estimated flux and the high frequency sinewave signal, the reference flux so that the high frequency flux response to the injected voltage is aligned with the measured current vector.
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公开(公告)号：US20240195335A1
公开(公告)日：2024-06-13
申请号：US18063895
申请日：2022-12-09
Inventor： Anantaram Varatharajan , Yebin Wang
CPC classification number: H02P21/18 , H02P21/12 , H02P21/141 , H02P21/20
Abstract: The present disclosure discloses a controller and a method for controlling an electric motor. The controller comprises a feedback controller configured to generate a reference voltage vector, a hybrid flux observer configured to estimate a flux error vector based on a difference between a first stator flux linkage observed and a second stator flux linkage, and a position observer configured to estimate a position of a rotor of the electric motor based on a projection of the flux error vector in a direction orthogonal to a direction of a voltage error vector shifted with a phase of dynamics of the hybrid flux observer. The controller further comprises a state estimator configured to estimate a value of a state of operation of the electric motor based on the estimated position of the rotor, thereby closing a feedback control loop of the feedback controller.
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Patent Agency Ranking
公开(公告)号：US20240178768A1
公开(公告)日：2024-05-30
申请号：US18550652
申请日：2023-04-12
Applicant: SOUTHEAST UNIVERSITY
Inventor： Wei WANG , Weijie TIAN , Ming CHENG
CPC classification number: H02P5/48 , H02P21/141 , H02P21/22 , H02P27/06
Abstract: A control method for a semi-centralized open winding multi-motor drive system includes: first, measuring current, voltage and position signal, computing system thrust by a velocity loop; then, distributing the thrust to each motor, converting the thrust into q axis current, computing dq axis voltages required for each motor by a current loop, and transforming the voltage demand to abc coordinate system through coordinate transformation; subsequently, modulating the voltage of each motor into a duty ratio instruction to judge whether the motor is in an over-modulated operating area, and performing over-modulation processing on the voltage in the over-modulated area; and finally, distributing the duty ratio instructions to independent and shared inverters. The control method of the present disclosure can reduce the hardware cost and improve the safety and reliability of the system.
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7.发明公开公开(公告)号：US20240171107A1
公开(公告)日：2024-05-23
申请号：US18281731
申请日：2021-08-31
Applicant: Hitachi Astemo, Ltd.
Inventor： Shun TANIGUCHI , Noriya NAKAO , Kazuaki TOBARI , Toshiyuki AJIMA , Kentaro MATSUO
IPC: H02P25/024 , H02P21/14 , H02P21/22 , H02P27/08
CPC classification number: H02P25/024 , H02P21/141 , H02P21/22 , H02P27/08
Abstract: Disclosed is a synchronous machine control device capable of suitably executing stabilization control of a synchronous machine. This synchronous machine control device controls a power converter (2) to which a synchronous machine (1) is connected, and comprises: a first magnetic flux command calculation unit (21) that calculates a first magnetic flux command value from an electric current command value of the synchronous machine; a magnetic flux estimation unit (23) that estimates a magnetic flux value of the synchronous machine from an electric current detection value of the synchronous machine; a voltage calculation unit (19) that generates a voltage command value for the power converter such that the first magnetic flux command value and the magnetic flux value match; and a damping ratio control unit (27) that, on the basis of a vibration component of the magnetic flux value, generates a correction amount for the voltage command value such that the vibration component is damped.
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公开(公告)号：US20240120864A1
公开(公告)日：2024-04-11
申请号：US18242039
申请日：2023-09-05
Applicant: Schneider Toshiba Inverter Europe SAS
Inventor： Rashad Ghassani , Mohamad Koteich
IPC: H02P21/14
CPC classification number: H02P21/141 , H02P2207/05
Abstract: Examples include a method for determining a permanent magnet flux state of a rotor in a synchronous motor using a VSD. The method includes obtaining d-axis and q-axis inductance values of the motor, fixing a non-zero stator current magnitude and controlling a motor speed using a speed loop regulation in a stator current angle γ polar coordinate frame to reach a zero motor speed steady state corresponding to the fixed non-zero stator current magnitude, to the obtained d-axis and q-axis inductance values, and to a no-load situation. The method further includes recording coordinates of the reached steady state.
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公开(公告)号：US11929694B2
公开(公告)日：2024-03-12
申请号：US18032569
申请日：2021-05-20
Applicant: Mitsubishi Electric Corporation
Inventor： Takashi Hozuki , Hiroatsu Fukuoka
CPC classification number: H02P21/22 , H02P21/0025 , H02P21/141 , H02P21/34 , H02P2207/05
Abstract: A rotary machine control apparatus includes: a current detector detecting an alternating current flowing through a rotary machine and outputting a current detection value; a power converter supplying power to the rotary machine by applying an AC voltage based on a voltage command value; a current controller adjusting the voltage command value so that the current detection value matches a current command value; an estimator obtaining a magnetic-flux estimation value that is an estimation value of an amplitude of a magnetic flux vector in the rotary machine; and a magnetic flux controller adjusting the current command value so that the magnetic-flux estimation value matches a set magnetic-flux command value in a start-up control period from when the rotary machine is put in a state where the rotary machine rotates by inertia after interruption of power supply of the power converter until the power supply is resumed.
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公开(公告)号：US20180219497A1
公开(公告)日：2018-08-02
申请号：US15748208
申请日：2015-08-08
Applicant: Nidec Corporation
Inventor： Ahmad GHADERI
Abstract: A motor controller includes target current value generating circuitry that generates a d-axis target current value and q-axis target current value, motor current value generating circuitry that generates a d-axis motor current value and a q-axis motor current value of current supplied to a motor, command voltage value generating circuitry that generates a d-axis command voltage value from a difference between the d-axis motor current value and the d-axis target current value and a q-axis command voltage value from a difference between the q-axis motor current value and the q-axis target current value, command voltage value converting circuitry that converts the d-axis command voltage value and the q-axis command voltage value into three-phase command voltage values, and command voltage value modifying circuitry that modifies the three-phase voltage values based on motor flux values and target flux values.
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