Electrician Red Seal · Question
What is the synchronous speed of a 4-pole, three-phase induction motor connected to a standard 60 Hz supply?
The formula for synchronous speed is (120 * Frequency) / Number of Poles. For this motor, it is (120 * 60 Hz) / 4 Poles = 7200 / 4 = 1800 RPM.
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Question: What is the synchronous speed of a 4-pole, three-phase induction motor connected to a standard 60 Hz supply?
Answer options:
- 1200 RPM ✅ 1800 RPM
- 3600 RPM
- 900 RPM
Correct answer: 1800 RPM
Explanation: The formula for synchronous speed is (120 * Frequency) / Number of Poles. For this motor, it is (120 * 60 Hz) / 4 Poles = 7200 / 4 = 1800 RPM.
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