Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 31, Problem 8RQ
To determine
Identify why the resistors used in the rotor circuit is smaller for a starter.
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1- What are the functions of accumulators?2- Draw the hydraulic symbols for a pressure –temperature compensated flow control valveand Bidirectional motor?
The supply frequency is 50 Hz. What will be
the rotor voltage frequency if the motor
speed is equal to 90% of synchronous
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O 45 Hz.
O 10 Hz.
05 Hz.
O None.
This is for my mechatronics class in regards to PLC and ladder diagrams
It is common practice to include a NC contact after the coil to prevent overloading and overheating of a device such as a motor.
True or False
Chapter 31 Solutions
Understanding Motor Controls
Ch. 31 - Prob. 1RQCh. 31 - Prob. 2RQCh. 31 - A wound rotor induction motor has a stator that...Ch. 31 - Name three factors that determine the amount of...Ch. 31 - Prob. 5RQCh. 31 - Explain why controlling the rotor current also...Ch. 31 - What is the function of a micro limit switch when...Ch. 31 - Prob. 8RQCh. 31 - What is rotor slip?
Ch. 31 - Prob. 10RQ
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- Explain the Principles of Motor Control on how you understand it in your own words.arrow_forwardTo what is countertorque proportional?arrow_forwardProblem 5 1. Where and why is a centrifugal switch used in a split-phase motor? 2. Why and where is a capacitor used in the single-phase AC motor? 3. What type of motor would you select to perform each of the following jobs? (a) Electric drill: (b) Refrigerator: (c) Hair driers and desk fans: (d) Air Conditioner Fan: (e) XY plotters and printers: (f) Electric clock:arrow_forward
- The number of commutator slide equals to number of parallel circuits in the armature. number of brushes. nu ber of poles. O two slides only. The external characteristic of a shunt generator can be obtained directly from its ------characteristics. * open-circuit O internal performance O closed-circuitarrow_forwardWhat type of armature winding is generally used for machines designed to operate on low voltage and high current?arrow_forwardRefer to the schematic diagram in Figure 318. Assume that the motor is not running. When the third speed push button is pressed, the motor starts in its lowest speed. After a delay of 3 seconds, the motor accelerates to second speed and 3 seconds later to third speed. After a period of about 1 minute, the fourth speed push button is pressed, but the motor does not accelerate to fourth speed. Which of the following could cause this problem? a. Control relay CR2 coil is open. b. S2 contactor coil is open. c. CR3 coil is shorted. d. S3 contactor coil is open.arrow_forward
- In motor controls, what is chattering or “machine gunning,” and why do we want to prevent it?arrow_forwardA wound rotor induction motor has a stator that contains six poles per phase. How many poles per phase are in the rotor circuit?arrow_forwardExplain why controlling the rotor current also controls the stator current.arrow_forward
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