Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Chapter 46, Problem 6SQ
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Explain the controlling process of acceleration steps of a large DC motor by individual timers that have only light, single-pole control contacts.
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Chapter 46 Solutions
Electric Motor Control
Ch. 46 - Prob. 1SQCh. 46 - What physical characteristic distinguishes between...Ch. 46 - Prob. 3SQCh. 46 - What protection is available from excessive...Ch. 46 - How does a field accelerating relay prevent...Ch. 46 - Prob. 6SQCh. 46 - How may more steps of acceleration be added to a...Ch. 46 - Prob. 8SQ
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- ٢٢arrow_forward2. 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_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
- Rotor eccentricity can be caused by A. high motor loads.B. excessive voltage.C. poor motor mounting. D. loose stator coils.arrow_forwardHow the driving torque increases when the DC motor is suddenly loaded.arrow_forwardWhich of the following method is used to control the speed of DC motor above its rated speed? A)Armature control B)Voltage control C)Field control D)None of optionarrow_forward
- By looking at which part of the motor, it can be easily confirmed that a particular motor is a DC motor? (A) Frame (B) Shaft (C) Commutator (D) Stator (E) None of the above.arrow_forward1. It is a machine that converts mechanical energy to electrical energy. 2. It is a machine that converts electrical energy to mechanical energy. 3. It is cylindrical or drum-shaped where the coils are placed and can either be lap wounded or wave wounded. 4. It connects the commutator to the other parts of the DC machine. 5. It serves as the housing of the dc machine. 6. True or False: The shunt field winding is part of the armature. 7. True or False: The long shunt compound generator is when the armature is in series with the series field winding and parallel to the shunt field winding. 8-10. Your newly built house needs an elevator. Which from the following will be best to use- series, shunt or compound motor and why?arrow_forwardQ/ When a series dc motor is operated without a load, which of the following conditions occurs? * Ans 1- The armature draws excessive current 2- The armature speeds out of control 3- The armature will not turn 4-The voltage requirement increasesarrow_forward
- 5. 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_forwardWhich 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. Shaftarrow_forward6.a. When you're taking a PM motor apart you should exercise special care not to damage theA. end bells.B. commutator.C. permanent magnets.D. brush holders.6.b. A PM field servo motor may be equipped with a resolver that is used toA. excite the armature windings.B. create a voltage that increases with velocity.C. prevent the brushes from sparking.D. feed back position information.arrow_forward
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