Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 39, Problem 7SQ
Depending on their power factor ratings, what is the range of the leading power factor at which synchronous motors operate?
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The factor that enables the synchronous motor to operate at different electrical load characteristics Please explain.
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In order to change the rotation direction of the asynchronous motor, any two of the 3 phases applied to the stator can be swapped.
Chapter 39 Solutions
Electric Motor Control
Ch. 39 - Prob. 1SQCh. 39 - What is the effect of the starting winding of the...Ch. 39 - What are typical applications of synchronous...Ch. 39 - Prob. 4SQCh. 39 - A loaded synchronous motor cannot operate...Ch. 39 - Why must a discharge resistor be connected in the...Ch. 39 - Depending on their power factor ratings, what is...Ch. 39 - At what power factor do incandescent lights...Ch. 39 - Prob. 9SQCh. 39 - The speed of a synchronous motor is fixed by the...
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- What are the electrical failure categories for hermetic compressor motors?arrow_forward1-) a) Does the slip increase as the load increases in an asynchronous motor? Explain what is the reason for this. b) What does it mean when the slip is 0, 1, -1 in asynchronous motor, how is it achieved? Explain.arrow_forwardWhich of the following is true for the phasor diagrams drawn according to the ohmic, inductive and capacitive operating states of a round pole synchronous motor? a) Due to the voltage Efd, the excitation current is equal in capacitive operation and inductive operation b) Due to the voltage Efd, the excitation current is large in capacitive operation and small in inductive operation c) Due to the voltage Efd, the excitation current is small in ohmic operation and larger in inductive operation d) Due to the voltage Efd, the excitation current is small in capacitive operation and large in inductive operation.arrow_forward
- 1. What is the effect of the field excitation to the back emf of the synchronous motor?arrow_forwardWhat is the reason why a synchronous motor can be found running at no load?arrow_forwardFor a 3-phase, 4-pole, 50 Hz synchronous motor the frequency, no. of poles, and the load torque are all halved. Then what will be the motor speed?arrow_forward
- What determines when a synchronour motor is at normal excitation?arrow_forwardIn Synchronous Motor Operation How the regulating characteristics can be obtained from V curve?arrow_forwarda) Does the slip increase as the load increases in an asynchronous motor? What is the reason of this? b) What does it mean for Slip 0, 1, -1 in asynchronous motor, how is it achieved? Explain.arrow_forward
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