INTERACTIVE MINIMIZATION SCHEME OF COPPER LOSS IN INDUCTION-MOTORS BYCAPACITIVE EFFECT

The paper has presented a method for minimizing copper loss of wound-r otor induction motor using series resonance tank in series with the ro tor circuit. When an external circuit is connected in series with the rotor circuit, the values of the circuit's parameters which ensures mi nimum copper loss at any desired speed are computed. The computations are performed for both a fixed and a continuously-varying capacitance with respect to rotor speed. It has been found that the later case is better than the former. The optimization technique is then generalized to allow the motor to be driven from a variable frequency source.