Single-phase synchronous motor with permanent-magnet rotor and method of driving it

摘要

A single-phase synchronous motor with a permanent-magnet rotor and a stator provided with an exciter winding and pole pieces defining with the rotor an asymmetric air gap. The motor is driven by a static switch controlled by electronic driver means. The drive method comprises an initial stage of identifying the position of the rotor poles relative to the stator pole pieces by means of a succession of electric pulses of increasing intensity and alternating sign, until one of these saturates the stator magnetic circuit. <IMAGE>