Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 36, Problem 6SQ
Referring to Figure 36–4, why is it not possible to remove all of the resistance from the secondary circuit?
Fig. 36–4 Automatic acceleration of wound rotor motor using a simplified frequency relay system.
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A SCIM has the following specifications:480 V, 50Hz, synchronous speed of 750 rpm, 3-phase, Y-connected, 8-pole, stator resistance of0.9Ω, stator reactance of 4.9Ω, rotor resistance of 1.53Ω (referred to the stator), blocked rotorreactance of 4.9Ω (referred to the stator), core resistance of 441.1Ω, and magnetization reactanceof 50Ω. If it is operating at 735rpm, draw the equivalent circuit of the motor and calculate:1. The power delivered to the rotor from the stator2. The rotor losses3. The total mechanical power delivered to the load4. The torque delivered to the load5. The apparent power supplied from the source to the motor6. The power factor.
Completely solve and box/highlight/bold the final answers. WRITE LEGIBLY OR TYPEWRITE THE SOLUTIONS.
A 60 kW, 230 volts shunt generator has an equivalent armature resistance of 0.3 ohms, and shunt field resistance of 60 ohms.
Calculate:
a. armature current and induce voltage
b. generated power and total power loss
Determine the following based on the wiring diagram illustrated in figure 8 on worksheet 5 if it is that of a 6-pole, non-salient pole design, 60-Hz, 3-phase AC generator stator that has 10 volts induced in each coil.
What is the total number of coils on the stator?- A- 3, B- 18, C-54, D- 108
If the total number of coilson the stator are divided equally between the three phase belts how many coils are there in each phase? A-3, B-18, C-54, D-108
What is the total voltage induced in each of the three phase belts? A-30V, B-180V, C-312V, D-none of the above.
Chapter 36 Solutions
Electric Motor Control
Ch. 36 - Are the secondary resistors connected in three...Ch. 36 - Do secondary resistors on starters with three or...Ch. 36 - Does reversing the secondary rotor leads mean that...Ch. 36 - If one of the secondary resistor contacts (S2)...Ch. 36 - In Figure 362, how many different interlocking...Ch. 36 - Referring to Figure 364, why is it not possible to...Ch. 36 - Prob. 7SQCh. 36 - If there is a locked rotor in the secondary...Ch. 36 - Why is it necessary to remove the jumpers in...Ch. 36 - Prob. 10SQ
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