Discussion on “induction motors for multispeed service with particular reference to cascade operation.” Atlantic city, N. J., July 1, 1908

W. I. Slichter: There is a point in the subject of cascade connection of induction motors which the speaker would like to hear discussed, as it is particularly important in connection with railway engineering. The usual and first idea of the result of the cascade connection of induction motors is that it will make it possible to obtain from a given pair of motors a greater torque at a low speed than is obtained in normal operation. But a closer study of this subject shows that the maximum torque of two motors connected in cascade is always less than that of either one of the individual motors. This is a proved fact with regard to the operation of motors with like number of poles, but it would be interesting to know what the relation is with motors having different numbers of poles.