# A stator winding of a wound rotor motor contains six poles per phase. If it is connected to a 60 Hz power source, what is the synchronous speed? a. 3600 RPM b. 900 RPM c. 1800 RPM d. 1200 RPM

### Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

### Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

#### Solutions

Chapter 37, Problem 1SQ
Textbook Problem

## A stator winding of a wound rotor motor contains six poles per phase. If it is connected to a 60 Hz power source, what is the synchronous speed?a. 3600 RPMb. 900 RPMc. 1800 RPMd. 1200 RPM

Expert Solution
To determine

Choose the correct option to find the synchronous speed of a stator winding of a wound rotor containing six poles per phase.

The correct option is d.1200RPM.

### Explanation of Solution

Given data:

The number of poles per phase (p) is 6.

The frequency of the motor (f) is 60Hz.

Formula used:

Write the general expression to find the synchronous speed.

Ns=120fp (1)

Here,

f is the frequency of the motor,

p is the number of poles per phase.

Calculation:

Substitute 60Hz for f, and 6 for p in Equation (1).

Ns=120(60Hz)6=1200RPM

Therefore, the synchronous speed is 1200RPM.

Conclusion:

Thus, the correct option is d.1200RPM.

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