Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 30, Problem 4SQ
To determine
Explain the process of connecting solid-state controllers into existing electromagnetic starters.
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6.a. When you're taking a PM motor apart you should exercise special care not to damage theA. end bells.B. commutator.C. permanent magnets.D. brush holders.6.b. A PM field servo motor may be equipped with a resolver that is used toA. excite the armature windings.B. create a voltage that increases with velocity.C. prevent the brushes from sparking.D. feed back position information.
Why do you think some motor control circuit utilizes single voltage sources for control and power circuit? Explain.
Explain with mathematical reasons why direct current motors cannot be operated from a constant voltage source.
If a direct current motor is desired to be operated from a constant voltage source, explain the application to be done.
Chapter 30 Solutions
Electric Motor Control
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- If the starter resistance is 1.9 ohms, what current does the motor take at the instant of starting in a shunt motor rated 25-hp. 230-volt, 600-rpm having armature and a field resistance of 0.275 ohm and 160 ohms, respectively. (Assume a 2-volt brush drop)arrow_forwardHow can you determine the current that a direct current motor will draw at start-up?arrow_forward1. It is a machine that converts mechanical energy to electrical energy. 2. It is a machine that converts electrical energy to mechanical energy. 3. It is cylindrical or drum-shaped where the coils are placed and can either be lap wounded or wave wounded. 4. It connects the commutator to the other parts of the DC machine. 5. It serves as the housing of the dc machine. 6. True or False: The shunt field winding is part of the armature. 7. True or False: The long shunt compound generator is when the armature is in series with the series field winding and parallel to the shunt field winding. 8-10. Your newly built house needs an elevator. Which from the following will be best to use- series, shunt or compound motor and why?arrow_forward
- What is starter ? Function of starter?arrow_forwardMotors have many uses. Describe a motor you have experience with. What is it being used for, what power source it uses, and possibly it’s configuration. Explain why you picked this motor and if you have/need to perform(ed) any maintenance on it.arrow_forwardWhy starters are used for DC motors. Your answerarrow_forward
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