US 2015/0311835 A1 · MOTOR DRIVING SYSTEM

Abstract

The disclosed invention provides a synchronous motor driving system that reduces vibration attributed to a temporal second-order component of radial electromagnetic force in a three-phase synchronous motor and controls a d-axis current and a q-axis current to reduce noise that is produced as a result of vibration resonating with a structure. A motor driving system of the present invention causes a predefined negative d-axis current to flow into a motor in which a q-axis current is less than or equal to a predefined current value and d-axis inductance and q-axis inductance match substantially. The motor driving system causes a predefined negative d-axis current to flow into a motor in which d-axis inductance and q-axis inductance differ and causes the negative d-axis current to increase with an increase in the q-axis current.

Claims14

Dependent claims

A motor driving device having a motor control device comprising:

a power converter that converts a direct current to an alternating current;
a synchronous motor connected to the power converter;
and
a controller that detects a rotor position and motor currents of the synchronous motor and performs PWM control of the motor currents in response to a detected position,
wherein the controller causes a preset negative d-axis current to flow, when a q-axis current is close to approximately 0.

2 more elements

Dependencies are inferred from the claim text.

Motor driving system

Life of this patent

Motor driving system

Life of this patent

Abstract

Claims14