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high slip electric motors

high slip electric motors

high slip electric motors

(OP)
if a high slip motor name tag says its 1100 rpm why does it run 1190 rpm on the test bench with no load

RE: high slip electric motors

One reason for this 10 rpm difference could be: the supply frequency is slightly less than the specified frequnecy.

RE: high slip electric motors

(I supose this is a induction motor)

In my opinion, probably this bigger speed at no load (1190 rpm) than at nominal/full load (1100 rpm), is due to the fact that with no load the "resistant or load torque" is smaller than the torque at nominal load. Then the "equilibrium point" between electromagnetic torque and resistant torque is attained for a bigger speed. It can be clairly seen if you observe a typical speed-torque curve: a smaller torque implies a bigger speed (i.e. it aproches to the synchronous speed).

Regards

Paulo Pereirinha

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