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公开(公告)号：US20230006586A1
公开(公告)日：2023-01-05
申请号：US17780349
申请日：2020-11-13
Applicant: HITACHI ASTEMO, LTD.
Inventor： Kentaro MATSUO , Kohei MYOEN , Kenichi YOSHIDA , Kazuyoshi AIZAWA
Abstract: A power conversion device includes: an inverter that converts a DC voltage into an AC voltage and drives a synchronous motor; and a magnetic pole position correction unit that corrects an error in a magnetic pole position of a rotor from a rotation angle sensor of the synchronous motor. The magnetic pole position correction unit includes an actual current phase calculation unit that calculates a current phase from a current when three-phase lines are short-circuited during rotation of the synchronous motor and an ideal current phase calculation unit that calculates an ideal current phase based on a rotational speed of the rotor and a temperature of a stator, and corrects the magnetic pole position from a difference between outputs of the actual current phase calculation unit and the ideal current phase calculation unit.
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公开(公告)号：US20240146222A1
公开(公告)日：2024-05-02
申请号：US18279088
申请日：2021-08-31
Applicant: Hitachi Astemo, Ltd.
Inventor： Hiroaki SATO , Hirokazu MATSUI , Toshisada MITSUI , Kohei MYOEN
CPC classification number: H02P21/18 , H02P21/22 , H02P2207/05
Abstract: A drive apparatus of a synchronous motor includes: a current detecting unit that detects a phase current flowing to the synchronous motor; and a magnetic pole position estimating unit that estimates a magnetic pole position of a rotor of the synchronous motor, based on the phase current detected by the current detecting unit. The magnetic pole position estimating unit includes a first peak-to-peak detector that detects a first peak-to-peak value representing a difference between a maximum value and a minimum value of the phase current, a quadrature component detector that detects a quadrature component of the phase current, and a second peak-to-peak detector that detects a second peak-to-peak value representing a difference between a maximum value and a minimum value of the quadrature component. The magnetic pole position estimating unit calculates a first magnetic pole position, based on the first and second peak-to-peak values while the synchronous motor is stopped, and estimates an initial magnetic pole position of the rotor, based on the first magnetic pole position.
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公开(公告)号：US20230336098A1
公开(公告)日：2023-10-19
申请号：US18012401
申请日：2021-06-10
Applicant: Hitachi Astemo, Ltd.
Inventor： Junki ISOBE , Kohei MYOEN
CPC classification number: H02P6/16 , H02P21/22 , H02P2207/05 , H02P29/60
Abstract: A motor control device controls a motor, which is driven by three-phase alternating currents and to which a magnetic pole position sensor measuring a magnetic pole position of a rotor is attached, using a detection value of a rotation angle of the motor based on a measurement result of the magnetic pole position by the magnetic pole position sensor, compares a peak-current-time rotation angle representing the detection value of the rotation angle at a peak of a current value of a target phase and a reference rotation angle representing the rotation angle at a peak of a predetermined current waveform of the target phase using any one phase of the three-phase alternating currents during a three-phase short circuit of the motor as the target phase, and corrects the detection value of the rotation angle based on a result of the comparison.
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公开(公告)号：US20220077795A1
公开(公告)日：2022-03-10
申请号：US17417311
申请日：2019-12-12
Applicant: Hitachi Astemo, Ltd.
Inventor： Shinyu KO , Kohei MYOEN , Eigo KISHIMOTO
Abstract: A first torque calculation unit 114 calculates torque TQ_DC currently generated by a motor 106 based on a DC current DC1. A second torque calculation unit 115 calculates torque TQ_UVW currently generated by the motor 106 based on U-phase, V-phase, and W-phase currents. A torque limit calculation unit 116 calculates a torque limit TQ_LMT1 using a torque limit characteristic map measured in advance based on a current limit DC_LMT1. A torque limit correction unit 117 compares first torque TQ_DC with second torque TQ_UVW to calculate a torque variation degree KP1. Then, the torque limit TQ_LMT1 is corrected using the variation degree KP1 to calculate a torque limit TQ_LMT2. As a result, even if required torque reaches the torque limit, the DC current does not exceed the current limit, and the output of the motor can be fully utilized by approaching the current limit.
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