Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 37, Problem 1SQ
To determine
Choose the correct option to find the synchronous speed of a stator winding of a wound rotor containing six poles per phase.
Expert Solution & Answer
Answer to Problem 1SQ
The correct option is
Explanation of Solution
Given data:
The number of poles per phase
The frequency of the motor
Formula used:
Write the general expression to find the synchronous speed.
Here,
Calculation:
Substitute
Therefore, the synchronous speed is
Conclusion:
Thus, the correct option is
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Students have asked these similar questions
The voltage applied to the stator of a three phase, 4 pole induction motor has a frequency of 50 Hz. The frequency of the emf induced in the rotor is 1.5 Hz. Determine the speed at which motor is running.
(a). 1450 rpm (b). 1455 rpm
(c). 1460 rpm (d). 1465 rpm
A 12 pole three phase induction motor with supply frequency of 50 Hz. If the slip is 3 % at a certain load, determine (a) the synchronous speed, (b) the speed of the rotor (c) the frequency of the induced e.m.f. in the rotor and (d) speed of the induction motor if the slip changes to 6 %
Synchronous speed
Answer for part 1
Speed of the rotor
Answer for part 2
frequency of the rotor emf
Answer for part 3
Speed of the motor if slip is changed to 6 %
Answer for part 4
A three phase induction motor with supply frequency of 60 Hz , 6 poles. If the slip is 5 % at a certain load, determine (a) the synchronous speed, (b) the speed of the rotor (c) the frequency of the induced e.m.f in the rotor and (d) speed of the induction motor if the slip changes to 6.75 %
Chapter 37 Solutions
Electric Motor Control
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