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公开(公告)号：US12095395B2
公开(公告)日：2024-09-17
申请号：US17754772
申请日：2020-10-21
发明人： Takayuki Miyajima
CPC分类号： H02P27/08 , H02M1/126 , H02M7/5395 , H02P21/05 , H02P21/22
摘要： A power conversion apparatus that converts an input alternating current power supplied from an alternating current power supply into an output alternating current power having a predetermined voltage and frequency, includes an inverter circuit configured to supply the output alternating current power to a motor, and a compensation unit configured to compensate for a harmonic of an input power of the motor, and the compensation unit detects a harmonic component generated in synchronism with a speed of the motor in the input power, and varies a phase of an alternating current voltage output from the inverter circuit at the same frequency as the harmonic component, so as to reduce the harmonic component.
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公开(公告)号：US11824472B2
公开(公告)日：2023-11-21
申请号：US17481053
申请日：2021-09-21
IPC分类号： H02P23/28 , H02K9/19 , H02K21/02 , H02P25/022 , H02P27/06
CPC分类号： H02P23/28 , H02K9/19 , H02K21/02 , H02P25/022 , H02P27/06 , H02K2209/00
摘要： A motor drive apparatus includes a motor, a power converter, and a controller that controls the voltage supplied to the motor by the power converter. The power converter converts a voltage of a 400 V-class AC power supply to a voltage with an effective value lower than an effective value of the 400 V-class AC power supply. The power converter converts the voltage by a switching operation of a plurality of switching elements. The motor is configured so that a value of φ×Vx/Ld is greater than Pmax when an effective value voltage Vx=200 V. A d-axis inductance of the motor is Ld. A flux linkage of the motor is φ. A maximum output of the motor in a device where the motor is mounted is Pmax. The controller has a control mode in which an effective value voltage higher than Vx is applied to the motor.
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公开(公告)号：US11750131B2
公开(公告)日：2023-09-05
申请号：US17754276
申请日：2020-09-29
CPC分类号： H02P23/03 , H02P23/14 , H02P2207/05
摘要： A motor drive method is a method of driving a motor by a motor drive apparatus. The motor drive apparatus includes an inverter that regulates supplied power to the motor that is a position sensorless synchronous machine, and includes a controller that outputs a control signal to control the inverter. The method includes reducing output torque of the motor to be less than maximum output torque, in a speed range that is lower than a first speed at which the motor rotates. The maximum torque that is output from the motor is the maximum output torque in a case the motor drive apparatus drives the motor.
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公开(公告)号：US11736050B2
公开(公告)日：2023-08-22
申请号：US17754275
申请日：2020-09-29
CPC分类号： H02P23/03 , H02P23/14 , H02P2207/05
摘要： A motor drive method is a method of driving a motor by a motor drive apparatus. The motor drive apparatus includes an inverter that regulates supply power to the motor that is a synchronous machine and includes a controller that controls the inverter. The method includes changing, before loss of synchronism, a speed of the motor from a second speed range to a first speed range. A speed range in which the motor is operable at a substantially fixed speed is the first speed range, and a speed range that is lower than the first speed range and includes zero speed is the second speed range.
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公开(公告)号：US11984827B2
公开(公告)日：2024-05-14
申请号：US18548136
申请日：2022-03-25
发明人： Tomoki Nakata , Takayuki Miyajima , Nobuo Hayashi
CPC分类号： H02P21/05 , B60L50/51 , F25B31/02 , H02P21/22 , H02P27/12 , B60K1/00 , H02P2207/05 , H02P2207/055
摘要： A motor control apparatus configured to convert an input power supplied from a power supply to an output alternating-current power having a predetermined voltage and a predetermined frequency is provided. The motor control apparatus includes an inverter circuit configured to supply the output alternating-current power to a motor, and is configured to perform a control to suppress an amplitude of a first harmonic component that occurs synchronously with a rotation rate of the motor in a power input into the motor to be lower than or equal to a predetermined value and to suppress an amplitude of a second harmonic component that occurs in an electromagnetic exciting force of the motor at a same frequency as the first harmonic component to be lower than the amplitude of the second harmonic component in a case of the amplitude of the first harmonic component being suppressed to a minimum.
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