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Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818

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BuyFindarrow_forward

Electric Motor Control

10th Edition
Herman
Publisher: CENGAGE L
ISBN: 9781133702818
Chapter 37, Problem 1SQ
Textbook Problem
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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

To determine

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

Answer to Problem 1SQ

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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