3 phase induction motor energy feedback

[spartekus]

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

 

[iop95]

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).

 

[FvM]

The essential point is that the passive 3-phase rectifier bridge has to be replaced by a bidirectional AC/DC converter, usually 3-phase bridge similar to the motor converter with additional chokes or filters to reduce current harmonics. See https://en.wikipedia.org/wiki/Variable-Frequency_Drive#Regenerative_drives

 

[spartekus]

thank you for answers