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A constant-speed drive is not, in its nature, what industry usually requires. On the contrary, the ability either to change speed uniformly over a declared range, or to obtain two or more alternative fixed speeds, is commonly very advantageous. Like the squirrel-cage induction motor, the salient-pole synchronous motor has secured wide use because of its many well-known virtues. This is in spite of its inherent fixed speed, which is only sometimes required and is often actually disadvantageous.1 2-speed salient-pole synchronous machine: 219/256hp. at 600/750 rev/min

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