Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 42, Problem 10SQ
Why is a control relay (CR1) used in Figure 42–6?
FIG. 42–6 Line diagram for automatic operation of synchronous motor using polarized field frequency relay.
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Chapter 42 Solutions
Electric Motor Control
Ch. 42 - What are the two basic methods of automatically...Ch. 42 - What is an out-of-step relay?Ch. 42 - Why is an out-of-step relay used on automatic...Ch. 42 - Under what conditions will the out-of-step relay...Ch. 42 - What is the last control contact that closes on a...Ch. 42 - What influence do both of the polarized field...Ch. 42 - Prob. 7SQCh. 42 - Approximately how much time (in terms of...Ch. 42 - How does the AC coil of the PFR receive the...Ch. 42 - Why is a control relay (CR1) used in Figure 426?...
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- Write the answer using clear explanations, details and diagrams:A load is attached to a synchronous motor. What will happen when the load is changed on this motor? As the synchronous motor requires adjusting field current, what effects does a change in field current have on the synchronous motor? Explain the effects of the changing parameters with the proper phasor diagram.arrow_forwardWhy there is no mechanical vibration present in solid state relay? Compare the working of electromechanical relay, reed relay and solid state relay. Explain the different types of momentary switches.arrow_forwardWhat is meant by the compelling action produced by an accelerating relay?arrow_forward
- Explain the working principle of induction type electromagnetic relay Fast pleasearrow_forwardReview/Explain with the aid of sketches the following excitation methods for a synchronous motor. DC EXCITATION, DC BRUSHLESS, AC EXCITATION.arrow_forwardWhat determines when a synchronour motor is at normal excitation?arrow_forward
- What is an out-of-step relay?arrow_forwardYour Answers may be presented through Discussions, Drawings/Figures/Diagrams, Reference to NEC/PEC and Computations What is the full-load current of a 230-volt, 3-phase, 125-horsepower synchronous motor when it is operated at an 80% power factor?arrow_forwardis the following correct? True or false? In order to change the rotation direction of the asynchronous motor, any two of the 3 phases applied to the stator can be swapped.arrow_forward
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