Title :
New modulation encoding techniques for indirect rotor position sensing in switched reluctance motors
Author :
Ehsani, M. ; Mahajan, S. ; Ramani, K.R. ; Husain, I.
Author_Institution :
Dept. of Electr. Eng., Texas A&M Univ., College Station, TX, USA
Abstract :
Two novel indirect switched reluctance motor (SRM) rotor position (RP) sensing schemes based on winding current amplitude and phase modulation are presented. An off phase is supplied with a stiff sinusoidal carrier voltage from the sensing circuit to be modulated by an RP dependent phase inductance function. The modulated signal is decoded to obtain the information signal and is calibrated to obtain the RP angle continuously. A combination of phase modulation and amplitude modulation encoder techniques was designed and tested on a 5 hp three-phased 6-4 SRM over a wide range of speed. The position detection scheme kept excellent track of the rotor angle continuously under both load and no-load conditions. This scheme is extremely robust to switching noise present in the sensing phase due to mutually induced voltages
Keywords :
encoding; machine control; modulation; position control; rotors; switching circuits; synchronous motors; 5 hp; amplitude modulation; current amplitude; indirect rotor position sensing; information signal; machine position; modulation encoding; off phase; phase inductance function; phase modulation; position control; robustness; rotor angle; stiff sinusoidal carrier voltage; switched reluctance motors; three-phased; winding; Amplitude modulation; Circuits; Decoding; Encoding; Inductance; Phase modulation; Reluctance machines; Reluctance motors; Rotors; Voltage;
Conference_Titel :
Industry Applications Society Annual Meeting, 1992., Conference Record of the 1992 IEEE
Conference_Location :
Houston, TX
Print_ISBN :
0-7803-0635-X
DOI :
10.1109/IAS.1992.244363
