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Performance of Polyphase Induction Motor Without LoadingAuthor: E.E. Kimberly The approximate characteristics of a polyphase induction motor may be found without the necessity of loading. It is possible to construct a circuit of resistances and reactances in a series and parallel combination such that, when one of the elements is varied, the current variations simulate those in an induction motor. Such a circuit, which is shown in up, but is shown to justify the vector diagrams of Figs. 1814 and 1815. The quantities R_{1}, X_{1}, R_{2} and X_{2} of the motor are also in its equivalent circuit; but RL is a variable resistance in the circuit whose variation may be made to simulate a variable load on the motor. The vector diagram and locus resulting from changes in the motor load is called the circle diagram of the motor.4


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