What should the resistance of the start winding be when testing a multi-speed motor?

What should the resistance of the start winding be when testing a multi-speed motor?

• A. Zero ohms
• B. Five ohms
• C. Twenty ohms
• D. One thousand ohms

Answer: (B)

The resistance of the start winding in a multi-speed motor typically falls within a range that is around five ohms. This value indicates that the winding is functioning properly and is capable of producing the necessary magnetic field to start the motor effectively. When conducting a resistance test, finding a reading in this range suggests that there are no significant breaks or shorts in the winding, which is essential for the motor's operation. If the resistance were too low, such as zero ohms, it could indicate a direct short circuit which would prevent the motor from operating. Conversely, if the resistance were significantly higher than five ohms, this could point to issues like increased resistance due to wear and heat, indicating potential problems with the winding that could impair motor efficiency or operation. Thus, a reading of five ohms is indicative of a healthy start winding in a multi-speed motor.

The resistance of the start winding in a multi-speed motor typically falls within a range that is around five ohms. This value indicates that the winding is functioning properly and is capable of producing the necessary magnetic field to start the motor effectively. When conducting a resistance test, finding a reading in this range suggests that there are no significant breaks or shorts in the winding, which is essential for the motor's operation.

If the resistance were too low, such as zero ohms, it could indicate a direct short circuit which would prevent the motor from operating. Conversely, if the resistance were significantly higher than five ohms, this could point to issues like increased resistance due to wear and heat, indicating potential problems with the winding that could impair motor efficiency or operation. Thus, a reading of five ohms is indicative of a healthy start winding in a multi-speed motor.