Patent ID: 9577565
Date: 2017-02-21
CPC Classifications: H02M,H02P

Claim:
1. A motor control device having incorporated therein a noise filter that prevents noise generated in a PWM control inverter from leaking to an alternating-current power source, wherein the motor control device includes a current detector that detects a noise current flowing into the noise filter, a sampling unit that samples a noise-current detection value output from the current detector at a cycle of a carrier frequency of a triangular-wave carrier signal used for generating a PWM signal, a determination unit that compares a current sampled value and a previous sampled value output from the sampling unit to determine whether the compared values are equal to each other or not, or are close to each other or not, and a carrier-frequency changing unit that changes the carrier frequency to another frequency when a result of determination made by the determination unit indicates that these values are equal to or close to each other.