Sensorless control of single phase PM brushless DC motor drives

Abstract

A comprehensive approach by FEM analysis and experimental measurements is done in order outline the peculiarity of single phase PM-BLDC motor and to deliver machine parameters necessary for further simulations and control tasks. A detailed approach of modeling a single phase PM-BLDC motor for control purpose is presented and an advanced digital simulation model of the motor control system is developed. Two motion sensorless control methods for single phase permanent magnet brushless d.c. (PM-BLDC) motor drives, based on flux estimation are introduced. The first one is based on a prior knowledge of the PM flux/position characteristic while the second one is based on a fictitious orthogonal flux system. Both method are detailed, illustrated by simulation results and validated by experiments. In order to obtain an enhanced sensorless control system the regenerative braking is also implemented under sensorless control.