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Paper Information

Journal:   INTERNATIONAL JOURNAL OF ENGINEERING   FEBRUARY 2004 , Volume 17 , Number 1 (TRANSACTIONS A: BASICS); Page(s) 11 To 18.
 
Paper: 

AUTOMATIC PHASE ADVANCING IN SWITCHED RELUCTANCE MOTOR BY EMPLOYING AN ‎ELECTRONIC GOVERNOR FOR A DESIRE SPEED/ANGLE PROFILE

 
 
Author(s):  AFJEHEI S.A.A.F., SAHEBI M.R.
 
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Abstract: 
Switched reluctance motor (SRM) drive has remarkable characteristics that make it ‎attractive for high-speed applications. As the motors speed increases the shape of the ‎current waveform changes in such way that limits the production of motoring torque. ‎At high speeds, it is possible for the phase current never reaches the desired value due ‎to the self e.m.f. of the motor, therefore, the torque falls off. In order to remedy this ‎problem, the phase turn on angle is advanced in such way that the phase commutation ‎begins sooner. Advancing the commutation angle offers the advantages of getting the ‎current into the phase vinding while the inductance of the phase is low, and also of ‎having a little more time to get the current out of the phase vinding before the rotor ‎reaches the negative torque region. Since the SRM drive is a variable speed motor ‎then, the amount of advancing for the turn on angle should be accomplished ‎automatically according to the speed of the motor, meaning, as the motor speed ‎increases so should the turn on angle and vice versa. In this respect, this paper ‎introduces an electronic governor using a P.L.L. module in conjunction with a micro ‎controller to achieve this task for a desired speed/advancement angle profile, which is ‎considered to be linear in this study. The governor causes 0-14 degrees automatic ‎adjustment in the turn on angle from stand still to a pre-set speed for a SR motor. A ‎linear analysis of the current waveform for the motor under different advancements of ‎the turn on angle has been performed and the plots are shown. Finally, the ‎experimental results of employing the governor on a 6 x 4 SRM drive are presented‏.‏
 
Keyword(s): SWITCHED RELUCTANCE MOTOR, SRM, SWITCHED RELUCTANCE DRIVE, MOTORS, ELECTRONIC GOVERNOR IN SRM
 
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