Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 57, Problem 5SQ
To determine
Explain whether the direction of the DC motor is reversed or not when the AC driving motor of a self-excited motor-generator set is reversed.
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Electric Motor Control
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- Review/Explain with the aid of sketches the following excitation methods for a synchronous motor. DC EXCITATION, DC BRUSHLESS, AC EXCITATION.arrow_forwardA 250-V, 4-pole, wave-wound DC series motor has 782 conductors on its armature. It has armature, diverter and series field resistance of 0.15 ohm, 0.02 and 0.05 respectively. The motor takes a current of 40 A. Estimate its speed if it has a flux per pole of 25 mWb.arrow_forwardHow is a rotating magnetic field produced in a three-phase induction motor? Explain itwith the help of suitable diagrams.arrow_forward
- Which of the following statements about three-phase squirrel-cage induction motor is false? (A) it has no external electrical connections to it's stator. (B) A three-phase supply is connected to it's stator. (C) A magnetic flux which requires little or no skilled maintenance.arrow_forwardA 4-pole wave-wound motor armature has 880 conductors and delivers 120 A. The brushes have been displaced through 3 angular degrees from the geometrical axis. Calculate (a) demagnetising amp-turns/pole (b) cross- magnetising amp-turns/pole (c) the additional field current for neutralizing the demagnetisation of the field winding has 1100 turns/pole.arrow_forwardExplain with the principle of operation of the following machines with necessary diagrams: a) DC Motors b) Asynchronous motor c) Synchronous generator PLEASE EXPLAIN EACH ATLEAST TWO PAGES.arrow_forward
- - Compare AC Motor and DC Motor - Types of AC Generator and its explanation * Long Explanationarrow_forwardBy looking at which part of the motor, it can be easily confirmed that a particular motor is a DC motor? (A) Frame (B) Shaft (C) Commutator (D) Stator (E) None of the above.arrow_forwardWhat is a motor? Explain its orientation.arrow_forward
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