Sensorless Control of Axial Flux Permanent Magnet Motor at Standstill and at Low Speed

摘要

The paper describes sensorless method of rotor position detection without any mechanical sensor. Presented method bases on phase inductance variations connected with position of the rotor. The method uses one test voltage pulse only to provide position information. Such a method can yield an initial position of the rotor and can provide a start-up of the motor from standstill in certain direction. Low speed control can also use presented method. Laboratory tests on Axial Flux Permanent Magnet Motor confirm the propriety of presented method.