Self-starting single-phase brushless DC motor and control therefor

摘要

The stator winding of a single-phase brushless DC motor with symmetrical rotor and stator air gap geometry is comprised of two serially connected relatively displaced sections energized with a source of direct current in accordance with the rotary position of the motor rotor. In the run mode, the full winding is energized; in the start mode, one of the sections is momentarily short-circuited if the initial winding energization fails to produce sufficient torque for starting.