Motor control device, motor control method, steering system, and vehicle drive system
AssigneeHitachi Astemo, Ltd.
InventorsKatsuhiro Hoshino, Takafumi Hara, Takaya Tsukagoshi
Life of this patent
Estimating the term…
Abstract
A motor control device includes: an inverter circuit that drives a motor; and a control unit that generates a current command value on the basis of a torque command to the motor, and outputs a PWM pulse to the inverter circuit on the basis of the current command value to control the inverter circuit, and the control unit sets a phase shift amount of a carrier wave of the PWM pulse, estimates a fluctuating torque according to the phase shift amount, and corrects the current command value on the basis of the fluctuating torque.
Claims13
A motor control device, comprising:
- an inverter circuit that drives a motor;
- and
- a control unit that generates a current command value on a basis of a torque command to the motor, and outputs a PWM pulse to the inverter circuit on a basis of the current command value to control the inverter circuit,
- wherein the control unit sets a phase shift amount of a carrier wave of the PWM pulse, estimates a fluctuating torque according to the phase shift amount, corrects the current command value on a basis of the fluctuating torque, and includes a carrier frequency selecting unit that selects a carrier frequency of the carrier wave and a number of synchronization pulses of the PWM pulse per electrical angle cycle, and
- wherein the carrier frequency selecting unit sets the number of synchronization pulses to a positive integer.
A motor control method for controlling an inverter circuit by generating a current command value on a basis of a torque command to a motor and outputting a PWM pulse to the inverter circuit on a basis of the current command value, the motor control method comprising:
- selecting a carrier frequency of a carrier wave and a number of synchronization pulses of the PWM pulse per electrical angle cycle,
- setting the number of synchronization pulses to a positive integer,
- setting a phase shift amount of the carrier wave of the PWM pulse,
- estimating a fluctuating torque according to the phase shift amount, and
- correcting the current command value on a basis of the fluctuating torque.
Dependencies are inferred from the claim text.