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The effectiveness of an analog computer in studying the performance of induction machinery is demonstrated with computer results which show the dynamic behavior of 2-phase and 3-phase machines during balanced and unbalanced operation. The computer simulation for these various modes of operation is conveniently obtained from the equations which describe the symmetrical induction machine in an arbitrary reference frame. Of particular interest is the representation which is used to simulate the opening and closing of a stator phase. This simulation would be useful in studying the performance of the induction machine when used in conjunction with electronic switching devices. The examples which are given can be used directly, or in a slightly modified form, to study various practical problems. Also, these examples should serve as guideposts in selecting the best reference frame or the best combination of reference frames to be used in the computer simulation of systems which have more than one machine.