Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 56, Problem 3SQ
To determine
Name the device that is suited for maintaining a large difference in the input and output speed and explain the reason.
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type (o)
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2.
Write an expression of the two sinusoidal voltage waveforms whose effective value
is 7.071 V and whose phase difference is 90 degrees. Draw the phasor of those two sinusoidal
waveforms in the complex plane.
2. Determine developed torque and shaft torque of 220-V, 4-pole series motor with 800 conductors
wave-connected supplying a load of 8.2kW by taking 45A from the mains. The flux per pole is 25 mWb
and its armature circuit resistance is 0.60.
Ans.[143.25 Nm, 135.25 Nm]
Chapter 56 Solutions
Electric Motor Control
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- Don't use ai to answer I will report you answerarrow_forwardA 50-HP, 600-V compound motor, taking 80 A, operates at a speed of 495 r.p.m. at full-load. If the flux per pole is 9.1 x 106 Maxwells and the armature resistance is 0.01502, the field resistances are 0.006 ohms and 300 ohms. Calculate: a. Field currents and the armature current b. the counter emf c. the rotational loss Ans.[2A,78A,593.362 V,8982.236 W]arrow_forward1. A 600-V, 150-HP, 600 r.p.m. d.c. series motor has an armature and series field resistance of 0.120 and 0.040, respectively. The full-load current is 200A. (a) Find the back e.m.f. at full-load. (b) Find the armature developed power and torque at full-load. Ans. [568V, 1808.13 N.m]arrow_forward
- 3. An electrical device shown below has the following depicted voltage and current definition. The current in and the voltage vin for a certain period is recorded as shown in the bottom picture. (1) In different periods from 0 to time T4, determine if the electrical device works as a load or a source. iin + iin Vin Electrical Device 0 T₁ T2 T3 ΤΑ t Vin T2 ΤΑ tarrow_forward1. A 220V d.c. shunt motor has a 5V brush drop, an armature resistance of 0.20, and a rated armature current of 40A. Calculate: (a) the counter-back e.m.f. (EC), (b) power developed by the armature (Pd) in watts (c) mechanical power developed by the armature in horsepower. Ans.[207V, 8280 W, 11.099hp]arrow_forwardTests are carried on 400 V, 60 Hz, Y-connected, wound rotor three-phase induction motor with the following test results: DC Test: 21 V, 43 A No Load Test: 400 V, 20 A, 1200 W, 60 Hz Blocked Rotor Test: 100 V, 44 A, 2700 W, 19 Hz Find R1, X1, R2, X2, and Xm of this motor? xxx₁ = 0.5xbm fy Pen Pd 51-5 NN (1-5) 1208 1 [10Marks] N wr Parrow_forward
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