Question:
What is a Pony motor in the context of starting a Synchronous motor?
What is a Pony motor in the context of starting a Synchronous motor?
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A pony motor is a small auxiliary motor used to start a synchronous motor.
Updated On: May 27, 2026
- A motor that runs on DC only
- A small auxiliary motor used to bring the main motor up to speed
- The main cooling fan
- A motor used to reverse the direction
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The Correct Option is B
Solution and Explanation
Concept:
A synchronous motor is not self-starting, so it needs an external method to bring it near synchronous speed.
Step 1: A synchronous motor cannot start by itself because its average starting torque is zero.
Step 2: One method of starting is to use a small auxiliary motor.
Step 3: This auxiliary motor rotates the synchronous motor near synchronous speed.
Step 4: After reaching near synchronous speed, DC excitation is applied and the motor pulls into synchronism. This small auxiliary motor is called: \[ \boxed{\text{Pony motor}} \]
Step 1: A synchronous motor cannot start by itself because its average starting torque is zero.
Step 2: One method of starting is to use a small auxiliary motor.
Step 3: This auxiliary motor rotates the synchronous motor near synchronous speed.
Step 4: After reaching near synchronous speed, DC excitation is applied and the motor pulls into synchronism. This small auxiliary motor is called: \[ \boxed{\text{Pony motor}} \]
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