Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 32, Problem 2SQ
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Explain the method to obtain two speeds from a one-winding motor.
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What are the three basic types of three-phase motors?
A 220 V series motor takes 15 A and runs at 700 rpm. The armature resistance including the resistance of the series winding is 0.8 ohm. At what speed will it run if a 2-ohm resistance is connected in series with supply voltage? Assume the motor is taking the same current.
The armature winding of a 200-V, 4-pole, series motor is lap-connected. There are 280 slots and each slot has 4 conductors. The current is 45A and the flux per pole is 18mWb. The field resistance is 0.3-ohm and the armature resistance 0.5-ohm. Find the speed of the motor.
Chapter 32 Solutions
Electric Motor Control
Ch. 32 - Prob. 1SQCh. 32 - Prob. 2SQCh. 32 - What will happen if terminals T5 and T6 in Figure...Ch. 32 - Is the motor operating at high speed or low speed...Ch. 32 - Describe the operation of the line diagram in...Ch. 32 - Describe the operation of Figure 325 (B) by adding...Ch. 32 - In Figure 327, the motor cannot be started in high...Ch. 32 - Prob. 8SQ
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- A 220 V shunt motor has an armature resistance of 0.5 ohm and takes a current of 40 A on full-loads. By how much must the main flux be reduced to raise the speed by 50% if the developed torque increased by 10 %arrow_forwardA 120 V shunt motor has an armature equivalent of 0.5 ohm and a field resistance of 60 ohm. At full load, the motor takes 10 A and the speed is 1000 rpm. At what speed must this motor maybe driven as a generator to deliver 10 A to an external load at 120 V?arrow_forwardWhich 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 windingarrow_forward
- What are the different applications of split-phase motor?arrow_forward4- What are the differences between the components of a dc generator and a de motor? 5-How to solve the Commutation Problem in d.c machines 6-List the various methods of flux control for d.c series motors, and draw a neat diagram of one methodarrow_forwardA DC series motor of resistance 1 ohm across terminals runs at 1000 rpm at 250 V taking a current of 20 A. When an additional resistance of 6 ohm is inserted in series and taking the same current, the new speed would be ?arrow_forward
- what is the conclusion for the concepts of rotating amature and rotating field in an alternator?arrow_forwardWhy the Shunt Motor No Load Test (Experiment No. 7) is applicable to machines in which flux is practically constant i.e. shunt & compound wound machines but not for series * ??machinesarrow_forwardThe stationary windings or magnets of a DC motor are called thearrow_forward
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