- #1

souky101

- 21

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- TL;DR Summary
- AC motor RPM

Hi great folk

I have a Century AC motor which is ¼ HP, 115 V, 60 HZ

This is a Permanent Split Capacitor (PSC) motor

It has 4 poles, so the running speed according to the motor equation should be:

.

Speed = 120x60 / p …………….. Where P = number of poles

Therefore RPM = 120 X 60 / 4 = 1800

.

My question now is why the motor label shows 1625 RPM and no 1800

.

Thanks for your investigation in advance

I have a Century AC motor which is ¼ HP, 115 V, 60 HZ

This is a Permanent Split Capacitor (PSC) motor

It has 4 poles, so the running speed according to the motor equation should be:

.

Speed = 120x60 / p …………….. Where P = number of poles

Therefore RPM = 120 X 60 / 4 = 1800

.

My question now is why the motor label shows 1625 RPM and no 1800

.

Thanks for your investigation in advance