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A properly shunted center zero galvanometer is connected in the rotor circuit of a 6-pole, 50 hz wound rotor induction motor. If the makes 90 complete oscillations in one minute, the rotor speed is?

A properly shunted center zero galvanometer is connected in the rotor circuit of a 6-pole, 50 hz wound rotor induction motor. If the makes 90 complete oscillations in one minute, the rotor speed is? Correct Answer 970 rpm

Rotor frequency = s*f1 = 90/60 = 1.5 Hz. s = 1.5/50 = 0.03 rotor speed = 1000(1-0.03) = 970 rpm.

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