公开(公告)号：US12301148B2

公开(公告)日：2025-05-13

申请号：US18249299

申请日：2021-09-21

Applicant: HITACHI ASTEMO, LTD.

Inventor： Takaya Tsukagoshi ,  Shun Taniguchi ,  Takafumi Hara

IPC: H02P27/08

Abstract: A motor control device is connected to a power converter that performs power conversion from DC power to AC power and controls driving of an AC motor driven using the AC power, and the motor control device includes a carrier wave generation unit that generates a carrier wave, a carrier wave frequency adjustment unit that adjusts a frequency of the carrier wave, and a gate signal generation unit that performs pulse width modulation on a voltage command according to a torque command using the carrier wave and generates a gate signal for controlling an operation of the power converter, in which a phase difference between the voltage command and the carrier wave is randomly changed.

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.