Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 35, Problem 7SQ
To determine
Sketch the line diagram for a three-speed acceleration control with compelling timing relays.
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1- What is the starting torque developed by a split-phase or a capacitor start
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2- What is the current in-rush at the time of starting the motor? Does it cause
severe fluctuations on the line?
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What is the factor that enables the synchronous motor to operate at different electrical load characteristics? explain.
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- 2. Draw the schematic diagram of a six point Drum Switches that operate the long shunt compound dc motor in reverse –forward operation. Connect all the parts into the Drum Switch terminals only not in the outside of the Drum Switches. Explain your connection.arrow_forward21.a. When field voltage is controlled to provide a method of variable speed control, the system is using aconcept known as fieldA. stability.B. drive.C. bias.D. weakening. 21.b. What type of motor has the same wire diameter in both the field and the armature coils?A. Interpole-woundB. Series-woundC. Compound-woundD. Shunt-woundarrow_forwardI need answer within 20 minutes please please with my best wishesarrow_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_forwardWhat is the synchronous speed of an eight-pole stepping motor when connected to a twophase, 60-Hz AC line?arrow_forwardQ5. Describe the following to protect and control the motors: (i) Using circuit diagram and the current-time characteristics, explain the motor overload protection by thermal overload relay. Explain using a circuit diagram how the motor will automatic shutdown when input (ii) fails? (iii) Explain using circuit diagram the under voltage protection of a motor (iv) Draw the circuit diagram to explain the adjustable-frequency drive for a 3-phase induction motorarrow_forward
- Q(1) (B)-Correct the false statements 1- When c series de motor is operating without load, the armature draws excessive amount of current! 2- In DC machines the armature core is constructed of laminated steel sheets to reduces copper loss! 3- By field diverter method, the speed of series DC motor can be controlled above rated value! 4- To solve the Commutation Problem in large machines, Brush shifting is used!arrow_forwardExplain the effect of increasing the armature voltage on the behavior of the series wound machine without the braking unit.arrow_forwardWhat do we have to write for Question 7?arrow_forward
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