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公开(公告)号：US20180159458A1
公开(公告)日：2018-06-07
申请号：US15567659
申请日：2015-04-20
摘要： A control apparatus for controlling an electrical unit driven by AC power, the control apparatus comprising a pair of switching elements configured to convert power from a power source into AC power and supply the AC power to the electrical unit. The control apparatus comprises the steps of obtaining a current or voltage signal supplied to the electrical unit and convert the signal from an analog format to a digital format. The control apparatus comprises the steps of calculating a duty command value for performing a pulse width modulation (PWM) control for the electrical unit on the basis of the signal converted by the conversion unit. The control apparatus comprises the steps of generating a PWM signal on the basis of the duty command value calculated by the calculation unit and a carrier signal for performing the PWM control; controlling the AC power supplied to the electrical unit by switching a connection state of the switching element on the basis of the PWM signal generated by the generating unit; determining whether the carrier signal increases or decreases; and adjusting a switching timing of the switching element by correcting the duty command value calculated by the calculation unit on the basis of whether the carrier signal is increasing or decreasing determined by the determination unit.
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公开(公告)号：US20220368264A1
公开(公告)日：2022-11-17
申请号：US17629096
申请日：2020-08-28
摘要： An electric motor control apparatus that alternately switches modulation mode between an asynchronous PWM control, which controls an electric motor by fixing a PWM frequency, and a synchronous PWM control, which controls the electric motor by making the PWM frequency proportional to a drive frequency of the electric motor, wherein when switching the modulation mode, a compensation value is calculated based on a state quantity, which correlates with a component in a rotating coordinate system of a voltage applied to the electric motor and is obtained immediately before switching, and the voltage immediately after switching is compensated for by the compensation value.
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公开(公告)号：US20220140766A1
公开(公告)日：2022-05-05
申请号：US17431600
申请日：2019-02-18
IPC分类号： H02P27/08 , H02M7/5395
摘要： A power control method for calculating a duty command value to be used for a PWM control, generating a PWM signal corresponding to a comparison result between the duty command value and a carrier signal, and applying a PWM voltage to a load by driving an inverter based on the PWM signal. The power control method comprises obtaining a compensation amount according to a phase shift generated in the PWM voltage so as to compensate for the shift, correcting the compensation amount according to a cycle of the carrier signal, and correcting the duty command value depending on whether a strength of the carrier signal is increasing or decreasing using the corrected compensation amount.
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公开(公告)号：US20240339945A1
公开(公告)日：2024-10-10
申请号：US18710867
申请日：2021-11-19
发明人： Mitsuhiro SHOUJI , Tetsuro KOJIMA
摘要： Provided is an electric motor control method includes: calculating a second torque command value by correcting the first torque command value by a vibration compensation torque for suppressing vibration in an electric motor rotation speed; limiting the vibration compensation torque based on a limit request suggesting amount suggesting a situation in which suppression of vibration in the electric motor rotation speed is to be limited; determining a limit level representing a degree of limit on the vibration compensation torque; and calculating a voltage command value by feeding back a torque suggesting amount suggesting an electric motor torque to the second torque command value. In the torque control step, a feedback gain of the torque suggesting amount is determined with reference to the limit level.
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公开(公告)号：US20220368267A1
公开(公告)日：2022-11-17
申请号：US17630966
申请日：2020-08-27
发明人： Takayuki KIMA , Mitsuhiro SHOUJI
摘要： A motor control method for controlling a motor by using an applied AC voltage converted from a DC voltage with an inverter driven by a PWM control, the motor control method includes: calculating a voltage command value for the inverter in order to achieve a desired torque output in the motor; calculating a compensation gain configured to maintain a linear relation between the voltage command value and the applied AC voltage according to a modulation factor indicating a ratio of the applied AC voltage to the DC voltage before and after a conversion in the inverter; limiting the compensation gain using an upper limit value; calculating a compensation voltage command value by multiplying the voltage command value by the limited compensation gain; and applying the applied AC voltage to the motor by driving the inverter using the compensation voltage command value; wherein the upper limit value is set so that the upper limit value become smaller when the modulation factor changes significantly.
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公开(公告)号：US20170327062A1
公开(公告)日：2017-11-16
申请号：US15526456
申请日：2014-11-26
发明人： Tomoaki MORI , Mitsuhiro SHOUJI
IPC分类号： B60R16/023 , H02P6/08 , B60L15/20 , H02P27/08 , H02P29/028
CPC分类号： B60R16/0232 , B60L15/2045 , H02P27/06 , H02P27/085 , H02P29/028 , H02P29/032 , Y02T10/7258
摘要： A control device of an electric motor, including an electric motor, a drive portion that supplies power to the electric motor, a voltage commanding portion that controls the drive portion on the basis of a torque command, and control a drive torque of the electric motor, a current limiting portion that outputs a limiting signal for limiting power outputted by the drive portion in a case in which a current value between the drive portion and the electric motor exceeds a predetermined value, and a limiting permission determining portion that determines whether the current limiting portion permits or prohibits an output of the limiting signal to the drive portion, when the drive torque of the electric motor cannot satisfy the torque command in a case in which the current limiting portion outputs the limiting signal, the limiting permission determining portion prohibits the current limiting portion from outputting the limiting signal to the drive portion.
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