A 6-pole, 60 Hz motor runs at 1,140 RPM. What is its percent slip?

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Multiple Choice

A 6-pole, 60 Hz motor runs at 1,140 RPM. What is its percent slip?

Explanation:
Percent slip is the difference between the motor’s synchronous speed and its actual running speed, expressed as a percentage of the synchronous speed. The synchronous speed for a 6-pole machine at 60 Hz is n_s = 120 f / P = 120×60/6 = 1200 rpm. The motor runs at 1140 rpm, so the slip is 1200 − 1140 = 60 rpm. As a percentage of synchronous speed: (60 / 1200) × 100 = 5%. So the percent slip is 5%.

Percent slip is the difference between the motor’s synchronous speed and its actual running speed, expressed as a percentage of the synchronous speed. The synchronous speed for a 6-pole machine at 60 Hz is n_s = 120 f / P = 120×60/6 = 1200 rpm. The motor runs at 1140 rpm, so the slip is 1200 − 1140 = 60 rpm. As a percentage of synchronous speed: (60 / 1200) × 100 = 5%. So the percent slip is 5%.

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