Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 34, Problem 2SQ
To determine
Explain how a rotor is coupled to a stator.
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Which is the device in DC generators that converts AC into DC?
stator
brushes
commutator
armature
This type of armature winding delivers high e.m.f. and low current.
dummy or idle coils
lap winding
O frog-leg winding
wave winding
This term refers to the number of times a wire revolves around the armature
core.
turn
revolution
This is the rotating part of the gener
or motor.
rotor
stator
Which of these is NOT a part of a DC generator?
stator
slip rings
commutator
brushes
what is the conclusion for the concepts of rotating amature and rotating field in an alternator?
Chapter 34 Solutions
Electric Motor Control
Ch. 34 - What characteristic of wound rotor motors led to...Ch. 34 - Prob. 2SQCh. 34 - What other name is given to the wound rotor motor?Ch. 34 - Does increased resistance in the rotor circuit...Ch. 34 - Prob. 5SQCh. 34 - What is the difference between a manual faceplate...Ch. 34 - Refer to the basic control schematic in Figure...
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- the relation between armature and field currents in a series connected DC motor is O It = If + la O It=la - If O If = laarrow_forwardExplain the types of DC generators.arrow_forwardWhat are the different ways to supply DC power to rotor of an alternator? Which method is superior and why?arrow_forward
- What is the ratio of the fixed self-power E1 to the rotor electromotive force E2 by the effective winding cost of the stator and the rotor when the rotor is rotating at the slip s?arrow_forwardWhat are the three basic types of three-phase motors?arrow_forwardWhich of the following is preferred to counter the effect of armature reaction in DC machine? O Use of main pole OUse of interpoles Use of series winding O Shifting of brushesarrow_forward
- A 6-pole dc generator is running at 1200 rpm. What is the frequency of current in the armature winding?arrow_forwardQ 4. An 8-pole DC generator has 400 armature conductors and a useful flux of 0.05 Wb. What will be the emf generated if it is lap wound and runs at 1,500 rpm? What must be the speed at which it is to be driven to induce the same voltage if it is wave wound? (Ans. 500 V; 375 rpm) 05 A vave wound armature generator has 51 slots Fach slot contains 20 conductors Thearrow_forwardA 250 V d.c. shunt motor takes a current of 20 A. Resistance of shunt field winding is 200 ohm and the armature is 0.3 ohm. What is the current in the armature ?arrow_forward
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