Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 43, Problem 6SQ
To determine
Explain the reason for the increase in the speed of motor with the decrease of current flow to shunt field.
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7. A 4-pole, 500V shunt motor has 720 wave connected conductors on its armature. The full-los
armature current is 60A and flux per pole is 0.03 Wb. The armature resistance is 0.020 and th
contact drop per brush is 1V. then the full-load speed of the motor is --
a) 675 r.p.m.
b) 690 r.p.m. c) 705 r.p.m. d) none of the previous,
What is the factor that enables the synchronous motor to operate at different electrical load characteristics? explain.
2. A synchronous motor is running with a certain load, how you will ascertain whether it is running at lagging power factor or a leading power factor without the use p.f. meter?
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- During no load test on a 220 V, shunt motor having r_{a} = 0.7Omega and R_{f} = 220Omega the armature current is recorded to be 4 A. The rotational loss of the motor isarrow_forward1arrow_forwardOverhauling is a condition in which the motor’s armature rotates ( ] than the rotating stator field. A) more slowley B) more rapidlyarrow_forward
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- While operating at full load in all features, the synchronous motor changes characteristics when the load is completely removed.does it? Explain (you are expected to answer this question using the V-curve).arrow_forwardWe know that synchronous motor runs in a same speed no matter what the load is. There is another motor that exhibits almost the same kind of characteristics. Write the name of the motor.arrow_forwardA 4-pole, 650v shunt motor has 720 wave connected conductors on its armature, The full-load armature current is 80A and the line flux per pole is 0,04Wb. The armature resistance is 0.4 ohms. Calculate the full load speed. Select the correct response: 548.80 rpm 321,88 rpm 643.75 грm 344.86 грmarrow_forward
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