Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 55, Problem 3SQ
To determine
Write the action to be taken to prevent the excessive motor current when the frequency is reduced.
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Explain how does the current will be reduced during the starting of the motor.
what are designed to protect the motor from an overload condition
Why we do not have the motor continue running in its star connection.
Chapter 55 Solutions
Electric Motor Control
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- Define or state the principle of operation, draw the wiring diagram, discuss the construction and application of each motor Split phase capacitor motor Repulsion motorarrow_forwardA 400V D.C. shunt motor takes 5 A at no-load. R = 0.5 ohms, R,= 200 ohms. What is the ratio %3| %D a f of speed from full load to no-load, when the D.C. shunt motor takes 50 A on full load? (b) 0.8 (d) 0.4 (а) 0.94 (c) 0.6arrow_forwardA. The DC motor in Figure 3 on Worksheet 8 is aa) cumulatively connected short-shunt compound DC motor b) cumulatively connected long-shunt compound DC motor c) differentially connected short-shunt compound DC motor d) shunt DC motorB. Is the DC motor in Figure 1 on Worksheet 8 turning in the same direction as that in Figure 3?a) yes b) noarrow_forward
- One type of failure that's more common with 200 HP motors than with 10 HP motors is A. rotor bar failure.B. contactor failure.C. bearing failure. D. stator failures.arrow_forwardHow can you reduce the amount of voltage applied to the motor during inching?arrow_forwardWhy do you think some motor control circuit utilizes single voltage sources for control and power circuit? Explain.arrow_forward
- (B)- Indicate whether the following statements are true or false and correct the false statements 1- Wave wound armature has two parallel paths. 2- The current ratio is equal to 1/ turn ratio at no-load while the voltage ratio is equal to 1/ turn ratio at full load 5.4. 3-When a series de motor is operated without a load, the armature draws excessive current Ph 4- The hysteresis loss can be minimized by using core of thin laminations ل لهول 259 Ne 02arrow_forwardCONTROL TRANSFORMER 1 STOP OL1 OL2 OL3 1M K t 1M 1M 2M 2M 3 2M 3M H 3Marrow_forwardyou are working as a plant electrician. you are told that a large DC motor was returned from the rewind shop and was installed on the previous shift. the motor seemed to operate properly until load was added, the motor then stopped, reversed direction, and began to run at a high speed. what is the probable cause of the trouble, and what would you do to correct the problem?arrow_forward
- c) Based on Figure 3 (c), a basic DOL starter induction motor at a power station is experiencing run-time error and unable to start, based on your understanding, interpret the sequence of troubleshooting shall be carried out to identify the root cause of the abnormalities. 3P 1P MCB MCB STOP K1 START MOTOR Figure 3 (c)arrow_forwardQ/ During the test of shunt excited generator the voltage initially must be adjusted to 220V. then the generator is loaded and the motor field circuit resistance is ........... adjusted to 1/ Increase the speed. 2/ Reduce the speed 3/ Keep the speed constant 4/ To control the voltage. 5/ None of the mentionedarrow_forward2) What are the salient features of supply voltage control method? Speed control three phase induction motor by Supply Voltagearrow_forward
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