What will happen if the induction motor runs at synchronous speed ?
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Practically Sq. Cage Ind. Motor could not able to achieve synchronous speed. If so it happens then Ns=N; and s=0; And hence T=0; So, Sq. Cadge Ind. Motor could not run at synchronous speed.
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S=(nr-ns)/ns 

If s(slip) is equal to 1, means rotor will not move, that's happen when motor is not running.
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Since there is always slip present in rotor it cannot run at synchronous speed no current will be developed hence no torque will developed
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