BLDC MOTOR SYSTEM INCLUDING PARAMETER DETECTION CIRCUIT AND OPERATING METHOD FOR BLDC MOTOR SYSTEM

摘要

A BLDC motor system according to the present invention includes a motor driving circuit for controlling a pulse-width-modulation (PWM) inverter according to a control signal in a first or second operation mode and for outputting a switching signal according to each mode; the PWM inverter for receiving the switching signal to output three-phase voltages having a first frequency in the first operation mode and three-phase voltages having a second frequency in the second operation mode; a sensorless brushless direct current (BLDC) motor which is operated based on three-phase voltages having a frequency in a band different from the band of the first frequency, is not operated in the first operation mode, and is operated based on three-phase voltages having a frequency in a band equal to the band of the second frequency in the second operation mode; and a parameter detecting circuit for calculating three-phase parameter information of the BLDC motor by using voltages sensed in the PWM inverter.