公开(公告)号：US11560061B2

公开(公告)日：2023-01-24

申请号：US17284889

申请日：2019-09-12

Applicant: Hitachi Astemo, Ltd.

Inventor： Noriya Nakao ,  Fumikazu Takahashi ,  Kenichi Yoshida

IPC: B60L15/02 ,  H02P21/30 ,  B60L15/20 ,  H02K7/00 ,  H02P27/12

Abstract: A motor drive device includes a power conversion circuit that drives an AC motor and a controller that controls the power conversion circuit. The controller includes a command current calculation unit generating a command current according to command torque for the AC motor and a current control unit that performs feedback control for adjusting a current applied to the AC motor to the command current. The controller also includes a control gain setting unit that calculates a control gain used for the feedback control based on the command torque and sets the calculated control gain in the current control unit. The control gain setting unit performs control such that a time from a decrease of an absolute value of the command torque to switching of the control gain is longer than a time from an increase of the absolute value of the command torque to switching of the control gain.

公开(公告)号：US12212255B2

公开(公告)日：2025-01-28

申请号：US18012419

申请日：2021-04-20

Applicant: Hitachi Astemo, Ltd.

Inventor： Shun Taniguchi ,  Kentaro Matsuo ,  Kenichi Yoshida ,  Toshiyuki Ajima

IPC: H02P1/46 ,  B60L50/51 ,  H02P21/14 ,  H02P21/22 ,  H02P27/06

Abstract: Provided are an electric motor control device and an electric motor control method with high reliability capable of performing noise reduction control (or sensorless control) by superimposing a radio-frequency voltage and capable of performing compensation of a dead time of an inverter with a minimum necessary configuration. The electric motor control device includes: a radio-frequency voltage superimposing unit that adds a radio-frequency voltage command value to a fundamental wave voltage command value and outputs a voltage command value; a radio-frequency current estimation value calculation unit that estimates a radio-frequency current value from the radio-frequency voltage command value; a dead time compensation current estimation value calculation unit that adds a radio-frequency current estimation value estimated by the radio-frequency current estimation value calculation unit to a fundamental wave current command value; and a dead time compensation voltage calculation unit that compensates an output voltage of an inverter according to a dead time compensation current estimation value calculated by the dead time compensation current estimation value calculation unit.

公开(公告)号：US12199533B2

公开(公告)日：2025-01-14

申请号：US17780349

申请日：2020-11-13

Applicant: HITACHI ASTEMO, LTD.

Inventor： Kentaro Matsuo ,  Kohei Myoen ,  Kenichi Yoshida ,  Kazuyoshi Aizawa

IPC: H02P21/00 ,  H02P21/18 ,  H02P21/22 ,  H02P27/06

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.

公开(公告)号：US11664756B2

公开(公告)日：2023-05-30

申请号：US17605322

申请日：2020-03-13

Applicant: HITACHI ASTEMO, LTD.

Inventor： Kentaro Matsuo ,  Noriya Nakao ,  Kenichi Yoshida

IPC: H02P27/08 ,  H02P23/14 ,  B60R16/02

CPC classification number: H02P27/08 ,  B60R16/02 ,  H02P23/14

Abstract: Provided is a power conversion device that does not require adaptation work and can suppress a current beat regardless of an operation state of a motor. The power conversion device includes an inverter 1 that converts a DC voltage into an AC voltage and drives an AC motor 2, and beat compensation units 46 and 49 that suppress a current beat component of an output current of the inverter 1. The beat compensation units 46 and 49 include beat extraction units 50, 51, and 52 that calculate beat components of the output current of the inverter 1, and beat compensation voltage calculation units 53 and 54 that estimate beat compensation voltages from the beat components calculated by the beat extraction units 50, 51, and 52. The current beat component of the output current of the inverter 1 is suppressed based on the beat compensation voltages estimated by the beat compensation voltage calculation units 53 and 54.