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This paper puts forward an analytical method for calculating the performance of a split-phase induction machine, where the auxiliary winding can be connected to a center tap on the main winding. Some manufacturers produce machines like this to allow for dual voltage operation. The method utilizes an impedance matrix so that a variety of connections are possible. The analysis is described in full and tested experimentally. Asynchronous torque dips are included in the method, and these are clearly shown.