AC induction motor reverse 3 phase

  • #1

Main Question or Discussion Point

What happens if an big AC induction motor is running with full load an your suddenly reverse the 3 phase?
 

Answers and Replies

  • #2
677
16
Immediately after phase reversal, the motor will act like a generator and send power back to the source, and in doing so will heavily retard. As soon as it attain 0 speed it start rotating on the other direction. It would be like a regenerative Braking followed by direction reversal.
 
  • #3
141
0
Also as you swap the terminals you are likely to draw an arc due to the regenerating nature of the motor.
 
  • #4
549
28
I assume that you mean that you swap two phases over, thus reversing the direction of rotation of the motor, in a James Bond world the motor would try to turn backwards rip itself to pieces and start a chain reaction that ended with the bad guy's secret headquarters blowing up, in a real more prosaic world the motor overloads would trip, and the stand-by fan / pump would start automatically.
 
  • #5
Ok thanks.

is this called plugging?

Because if it is then it is not regenerative. When you plugging you draw big current from the supply to stop to ac motor.
 

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