Analysis of two-phase spindle motor driven by sensorless BLDC mode

Abstract

The performance of two-phase spindle motor is analyzed, which is driven by constant voltage sensorless BLDC mode. In the motoring operation, the rotor positions are estimated by back EMF detecting and a digital filter is used to realize BLDC sensorless control. The two-phase BLDC motor is more robust in the starting and low speed operation, and can realize accurate speed control. Both the simulations and experiments show that the proposed drive mode is effective in driving spindle motors