Design, performance of the speed control of a nonlinear variable reluctance motor drive using exact feedback linearization

Synchronous, motor drives are fast becoming an attractive alternative to DC, and induction motor drives, especially in the low speed, high power range. Different types, of control schemes, have been suggested for variable speed AC drives, fed from static power source. Among them, field oriented control employing vector control, strategies has become quite popular in recent near, A disadvantage of the scheme when applied to synchronous motor drives is that the motor always, operates at a lagging, power factor. In this, work. a generalized design strategy is suggested for the speed control loop of an inverter-fed synchronous motor drive, in which, its inherent flexibility to generate the same torque for different combinations of currents, is exploited that can achieve more general types of control. Existing control schemes such as unity power factor control, torque angle control. as well as field-oriented control etc can be obtained as special cases, for special types, of synchronous motor such as permanent magnet and variable reluctance motors, however the details of permanent magnet motor is beyond the scope of this, paper. The scheme has been validated through extensive simulation as well as laboratory experiments.