synchronous speed

noun, Electricity.

the speed at which an alternating-current machine must operate to generate electromotive force at a given frequency.

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It is usually expressed in per cent of the synchronous speed which is that of the revolving field.

Motion Picture Operation, Stage Electrics and Illusions Henry C. Horstmann
As their name implies, these motors have the characteristic of running at synchronous speed at all loads.

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