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LCI DRIVE FOR SYNCHRONOUS MOTORS ONLY

LCI DRIVE FOR SYNCHRONOUS MOTORS ONLY

LCI DRIVE FOR SYNCHRONOUS MOTORS ONLY

(OP)
Can someone explain why an LCI drive topology can be used with synchronous motors only.  I understand a VSI type drive can be used with both induction and synchronous.

RE: LCI DRIVE FOR SYNCHRONOUS MOTORS ONLY

A synchronous motor provides the capacitive reactive power that allows for the commutation of the inverter, hence the name Load Commutated Inverter. This is not possible with an asynchronous motor.

RE: LCI DRIVE FOR SYNCHRONOUS MOTORS ONLY

As sed2developer says, only a synchronous motor provides the ability to adjust the exitation to provide a leading power factor. That makes it possible for the load to commutate the inverter.

RE: LCI DRIVE FOR SYNCHRONOUS MOTORS ONLY

I have seen LCI used with induction motors, but needs a large capacitor across the motor terminals to allow commutation. They have a very poor speed range though  I think PWM drives are much cheaper these days for induction machines.

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