Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 48, Problem 9SQ
To determine
State what action should to be taken by the operator for the given situation.
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Explain how does the current will be reduced during the starting of the motor.
you 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?
Which one of the following is not a part of an
induction motor?
a. Starter
b. Rotor
c. Stator
d. Terminal Box
e. Frame/Yoke
f. Bearing
g. Shaft
Chapter 48 Solutions
Electric Motor Control
Ch. 48 - In Figure 482, what is the purpose of normally...Ch. 48 - Can a time-delay relay be used satisfactorily in a...Ch. 48 - Prob. 3SQCh. 48 - Prob. 4SQCh. 48 - Prob. 5SQCh. 48 - What is the purpose of the lockout relay or safety...Ch. 48 - What happens if the reverse push button is closed...Ch. 48 - Prob. 8SQCh. 48 - Prob. 9SQCh. 48 - In Figure 487, is it necessary to push the stop...
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- When a series dc motor is operated without a load, which of the following conditions occurs? * O The armature speeds out of control The armature draws excessive current O The voltage requirement increases O The armature will not turn O O Oarrow_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_forwardwhat happened to the DC motor if it runs without any starter? Explain with diagramarrow_forward
- A 220 V shunt motor driving its normal load draws an armature current of 50 A from a 220 V dc source. The armature resistance of this motor including brushes is 0.25 ohms. How much armature current (minimum) Will this motor draw from a 200 V DC source when driving the same load with the field adjusted to maintain the same speed.arrow_forward4.a. The device which responds to the heat developed within the motor is theA. shading coil.B. short-circuiter.C. bimetallic protector.D. current-operated relay.4.b. How is a rotating magnetic field produced during starting in a split-phase motor?A. A capacitor is inserted in the auxiliary-winding circuit.B. A low resistance coil is placed around a portion of each pole.C. Brushes are shifted off the hard-neutral position.D. An auxiliary winding is made with a high ratio of resistance to reactance.arrow_forward5. Which part (s) of the DC motor connect the power supply to the split- ring and coil? * O a) Carbon brushes O b) Magnets O c) Commutator d) Slip ringsarrow_forward
- Q1- For the stepper motor shown in the figure Draw the drive circuit? If this stepper motor has a 3° angle, how many step can move? 5-lead Red Black Motor Red / White C Green / White Greenarrow_forward4/arrow_forwardWhy are different motor connections shown for what appears to be the same motor in the various diagrams in Figure 332? FIG. 332 Typical arrangements for four-speed, three-phase, two-winding motors.arrow_forward
- What happens to a series connected direct current motor if its field winding opens at full load?arrow_forwardis the following correct? True or false? If the rotor of the asynchronous motor is reversed in the rotating field, the machine starts to work as a generator.arrow_forwardThe armature and field circuits of a 230-volt shunt motor have resistance of 0.31 and 115 ohms respectively. It takes 52 A when operating at a certain load. What is the counter emf?arrow_forward
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