Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Textbook Question
Chapter 32, Problem 7SQ
In Figure 32–7, the motor cannot be started in high speed. Why?
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Explain how does the current will be reduced during the starting of the motor.
Explain why reduced current is important during the motor acceleration
Why would the slip not change? If you start the motor at 80% of the rated frequency, wouldn't that be 48 Hz?
Chapter 32 Solutions
Electric Motor Control
Ch. 32 - Prob. 1SQCh. 32 - Prob. 2SQCh. 32 - What will happen if terminals T5 and T6 in Figure...Ch. 32 - Is the motor operating at high speed or low speed...Ch. 32 - Describe the operation of the line diagram in...Ch. 32 - Describe the operation of Figure 325 (B) by adding...Ch. 32 - In Figure 327, the motor cannot be started in high...Ch. 32 - Prob. 8SQ
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- Describe how pressure switches are connected to start and stop (a) small motors and (b) large motors.arrow_forwardQuestion 9 What factors affect the torque of a dc motor? (Select all that applies) A) Number of armature conductors B) Type of armature winding C) Armature current D) Field current E) Speed of the motor F Number of polesarrow_forward6. What Will Happen If The Direction Of Current At The Terminals Of A D.c Motor Is Reversed?arrow_forward
- 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_forwardExplain the different methods of breaking DC Motorsarrow_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_forward
- Synchronous motor when the load is taken completely while working at full load in all properties Does it change properties? Explain.arrow_forwardExplain how dc shunt motor is working with relevant circuit diagramarrow_forwardwhat happened to the DC motor if it runs without any starter? Explain with diagramarrow_forward
- How to avoid the effect of the high current at starting of the Motor? a. variable resistor is connected in series with Armature circuit b. variable resistor is connected in parallel with Armature circuit c. variable resistor is connected in series with field circuit d. None of the above Clear my choicearrow_forwardExplain why synchronous motor doesn’t have any self-starting torque. Demonstrate some measures to make it self-starting. Please dont copyarrow_forwardInduction motor speed control technique which is not recommended to be used at low speed is O V-I control O stator voltage control O slip power control O V-F controlarrow_forward
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