Thursday, 12 November 2015

generator - Minimal power circuit for recupating three phase motor drive on DC


A thee phase motor (like an asynchronous motor or an brushless DC motor) can be driven from DC power by using a half bridge on every of the three phases (for example by six FETs) if I'm right.


What is the minimal power circuit that -provided the right control- would be able to also generate on the motor, while feeding back to DC on any occasion? Meaning the circuit should not dissipate any power despite of losses, any power should be transfered from or to the motor.


I guess FETs alone won't do the job, as motor generating voltage may be lower then source DC voltage, so some kind of up conversion would be needed?




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