Design of Rotor Position Detecting Circuit with Band-pass Filters in Sensorless BLDC Motor Drives

摘要

The structure and characteristic of the band-pass filter are analyzed, and parameters of components are calculated, and a Back-EMF zero-cross detection circuit for BLDC motor sensorless control is designed in this paper. A simplified scheme of the circuit is proposed. The simulation results and the experimental results of the filter and the circuit are presented.