3-फेज इंडक्शन मोटर (3PIM) का समतुल्य परिपथ (equivalent circuit) संरचनात्मक रूप से किसके समतुल्य परिपथ के समान होता है?

If an industrial 3-phase induction motor frequently trips on thermal overload due to excessive temperature rise, which maintenance action should be taken first?

During the starting period of a slip-ring induction motor, why are external resistances inserted into the rotor circuit?