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公开(公告)号：US11205986B2
公开(公告)日：2021-12-21
申请号：US16795831
申请日：2020-02-20
发明人： Yuhi Nakada , Ryo Tachibana , Koji Mukaiyama
摘要： An inverter device includes a motor, a power supply that supplies the motor with electric current, an inverter that, during regenerative operation of the motor, performs switching between a first state in which regenerative current generated in the motor is returned to the motor again and a second state in which the regenerative current is supplied to the power supply, a first detector that detects a first condition electrically acting on the inverter, a second detector that detects a second condition electrically acting on the power supply, and a determiner that performs a first determination to perform switching between the first state and the second state, based on a detection result by the first detector or the second detector.
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公开(公告)号：US20220329192A1
公开(公告)日：2022-10-13
申请号：US17715013
申请日：2022-04-06
发明人： Satoshi Shimazu , Yuhi Nakada
IPC分类号： H02P27/06 , H02P29/032
摘要： An inverter device is provided. The inverter device converts power from a power source and drives a motor. The inverter device includes an inverter circuit having a switch, a driver circuit that switches the switch on and off, and a controller that controls the driver circuit. The controller has a speed calculator used to calculate a minimum speed of the motor based on a power source voltage. After the controller performs fail-safe control, when a speed of the motor is less than the minimum speed, the fail-safe control is ended.
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公开(公告)号：US11870375B2
公开(公告)日：2024-01-09
申请号：US17715007
申请日：2022-04-06
发明人： Takashi Koikegami , Satoshi Shimazu , Yuhi Nakada
CPC分类号： H02P21/18 , B60K1/00 , B60L15/007 , B60L15/20
摘要： A motor apparatus is provided. The motor apparatus includes a motor having a rotor and a stator, an inverter used to covert an input voltage into a three-phase alternating current (AC) voltage and provide the three-phase AC voltage to the motor, an inverter controller used to control the inverter, and a rotation angle sensor. The rotation angle sensor is fixed to the motor and is used to detect a rotation angle of the motor. The inverter controller includes a calculator. The calculator calculates an offset angle of an installation position of the rotation angle sensor according to a difference between a measured value and a theoretical value of a voltage phase of the motor.
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公开(公告)号：US11791758B2
公开(公告)日：2023-10-17
申请号：US17715013
申请日：2022-04-06
发明人： Satoshi Shimazu , Yuhi Nakada
IPC分类号： H02P27/08 , H02P27/06 , H02P29/032
CPC分类号： H02P27/06 , H02P29/032
摘要： An inverter device is provided. The inverter device converts power from a power source and drives a motor. The inverter device includes an inverter circuit having a switch, a driver circuit that switches the switch on and off, and a controller that controls the driver circuit. The controller has a speed calculator used to calculate a minimum speed of the motor based on a power source voltage. After the controller performs fail-safe control, when a speed of the motor is less than the minimum speed, the fail-safe control is ended.
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公开(公告)号：US20220385206A1
公开(公告)日：2022-12-01
申请号：US17752873
申请日：2022-05-25
发明人： Kazuhiro SAKAI , Satoshi Shimazu , Yuhi Nakada
摘要： The disclosure relates to an inverter device, including: an inverter circuit including a plurality of switching elements and a capacitor; an active discharge circuit including a first discharge resistor and a discharge switch connected in series, and connected between a positive electrode and a negative electrode of the capacitor; and a control circuit including a controller respectively connected to the switching elements and the discharge switch. The controller controls the switching elements and the discharge switch. The controller turns on the discharge switch to discharge the capacitor when the controller receives a discharge command from outside the inverter device and an electric motor is rotating.
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公开(公告)号：US20220329185A1
公开(公告)日：2022-10-13
申请号：US17715007
申请日：2022-04-06
发明人： Takashi Koikegami , Satoshi Shimazu , Yuhi Nakada
摘要： A motor apparatus is provided. The motor apparatus includes a motor having a rotor and a stator, an inverter used to covert an input voltage into a three-phase alternating current (AC) voltage and provide the three-phase AC voltage to the motor, an inverter controller used to control the inverter, and a rotation angle sensor. The rotation angle sensor is fixed to the motor and is used to detect a rotation angle of the motor. The inverter controller includes a calculator. The calculator calculates an offset angle of an installation position of the rotation angle sensor according to a difference between a measured value and a theoretical value of a voltage phase of the motor.
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公开(公告)号：US11472472B2
公开(公告)日：2022-10-18
申请号：US16637288
申请日：2018-06-22
申请人： Nidec Corporation
发明人： Takashi Koikegami , Yuhi Nakada , Kaori Nabeshi
IPC分类号： H02P27/06 , H02P27/08 , B62D6/00 , H02M7/537 , B62D5/04 , G01R31/327 , H02H7/08 , H03K17/082
摘要： A power conversion device includes a first inverter and a control circuit that controls an on/off operations of switches in the first inverter and diagnoses disconnection failures of n-phase windings, where n is an integer of three or more. The control circuit generates a control signal to turn off all of n low-side switches and n high-side switches, supplies the control signal to the n low-side switches and the n high-side switches and measures the n-phase voltages that change depending on patterns of on failures of the switches, and executes a first failure diagnosis to diagnose the on failures of the n low-side switches and the n high-side switches based on the measured n-phase voltages by referring to a table associating the patterns of the on failures of the switches with n-phase voltage levels.
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公开(公告)号：US11063545B2
公开(公告)日：2021-07-13
申请号：US16636919
申请日：2018-07-10
申请人： Nidec Corporation
IPC分类号： H02P29/00 , H02P27/08 , H02P29/032 , B62D5/04 , H02M7/5387 , H02P29/028
摘要： A power conversion device includes a first inverter and a control circuit that controls on/off operations of switches in the first inverter and diagnoses disconnection failures of n-phase windings where n is an integer of three or more. The control circuit generates a control signal to turn on one low-side switch of a first specific phase among n low-side switch in the first inverter, turn off the remaining n−1 low-side switches, and turn off all n high-side switches, supplies the control signal to the n low-side switches and the n high-side switches in a state where a neutral point of a motor is provided, measures n-phase voltages that change depending on patterns of disconnection failures of the n-phase windings, and diagnoses a disconnection failure based on the measured n-phase voltages by referring to a table associating the patterns of the disconnection failures with n-phase voltage levels.
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