Rotor Position Detection of Switched Reluctance Motors with a New Indirect Technique

The aligned to unaligned phase inductance ratio and the number of stator and rotor poles strongly affect the resolution of indirect rotor position sensing methods for switched reluctance motor (SRM) drives. This paper presents a new sensor-less rotor position detection for a three-phase single switch SR motor with regeneration capability at standstill mode.. The proposed method is based on the dependency of phase current waveform at turn off time to rotor position angle. It is shown that the combination of a motor with single switch per phase converter and a transient voltage suppressor (TVS) circuit de?ne a resonant circuit. In this method, the rotor position is achieved by inspecting of regeneration current results of applied high frequency and low level diagnostic pulses to the motor phases at the beginning step. Obtaining the rotor position of switched reluctance motors (SRMs) will done by means of the overlap of rising voltage measurements. During this interval, rotor position is detected by exchanging energy between the phase and source repeatedly in one cycle of a phase current. The resulted current magnitudes are measured and compared to detect the rotor position. The prototype controller was simulated, fabricated, and tested in laboratory and experimental results of the proposed SRM drive system are presented. The new configuration enables the motor for self-starting without any other mechanism or starting device.