Poll Results
No votes. Be the first one to vote.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
For large motors that operate at relatively low speeds, a higher number of poles is typically used. The speed of an AC motor (synchronous speed) is determined by the formula:
[ text{Synchronous Speed} = frac{120 times text{Frequency}}{text{Number of Poles}} ]
Given that the frequency (in Hertz) is fixed based on the power supply (such as 50 Hz or 60 Hz), the only way to decrease the speed of the motor is to increase the number of poles. For low-speed, large motors, it is common to see configurations of 8, 10, 12, or more poles.
This design principle is crucial in applications such as heavy-duty conveyors, large ball mills, pumps, fans, and compressors where high torque at low speeds is required.