Synchronous motor drive3 are fast becoming an attractive alternative to dc and induction motor drive3~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 sources. Among them, field oriented control enploying vector control strategies has become quite popular in recent years. A disadvantage of the schenle when applied to~ynchronous motor drives is that the motor alw~ys~perates at a lagging power factor. In this work~a generalized design strategy is sug~ted 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 pennanent magnet motor is beyond the scope of this paper. The scheme has been validated through extensive simulations as well as laboratory experiments.
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