3 phase induction motor energy feedback

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spartekus

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hi all,

Do you know, how it is possible to make energy-feedback at 3-phase induction motor,
what do i need more additional to my circuit?

thanks a lot
 

Induction motor may be used as generator and that need that rotor speed be higher than rotating field speed; also, depending of motor construction, for excitation may use remanent magentic field or may use capacitors to "inject" a reactive current to provide excitation field. Anyway, control system is complex, because functional instability. Attached question is unclear; may need voltage line feedback devices to control voltage in generator regim (if no loads, this voltage may increase above maxim limits).
 

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