Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 32, Problem 5RQ
To determine
Identify what regulates the output voltage if a brushless exciter supplies the rotor with the excitation current.
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What happens when the low-voltage current flow in the coil primary winding is interrupted by the switching device?
The primary winding delivers a high-voltage spark to the plugs.
The magnetic field in the coil primary builds.
The secondary voltage drops to zero volts.
High voltage is induced in the secondary windin
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- When a brushless exciter is used, what converts the alternating current produced in the armature winding into direct current before it is supplied to the field winding?arrow_forwardIf an alternator is used to provide variable frequency, how is the output voltage of the alternator controlled?arrow_forwardWhat conditions must be met before two alternators can be paralleled together?arrow_forward
- What is the function of the compensating winding?arrow_forwardWhy can a multispeed fan motor be operated at lower speed than most induction motors without harm to the motor windings?arrow_forwardIs the resistance in the start winding greater or less than the resistance in the run winding?arrow_forward
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