Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 33, Problem 25RQ
What is the principle of operation of a stepping motor?
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Explain the construction of AC serve motor, also draw its diagram.
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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.
At rated load, a shunt motor draws an armature current of 100 A from a 240 V source while running at 1000 rpm producing a back emf of 228 V. At no load, the armature current drops to 5 A that produces a back emf of 235 V. How fast does the motor run at no load?
Chapter 33 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 33 - What are the three basic types of split-phase...Ch. 33 - The voltages of a two-phase system are how many...Ch. 33 - How are the start and run windings of a...Ch. 33 - In order to produce maximum starting torque in a...Ch. 33 - What is the advantage of the capacitor-start...Ch. 33 - On average, how many degrees out of phase with...Ch. 33 - What device is used to disconnect the start...Ch. 33 - Why does a split-phase motor continue to operate...Ch. 33 - How can the direction of rotation of a split-phase...Ch. 33 - If a dual-voltage split-phase motor is to be...
Ch. 33 - When determining the direction of rotation for a...Ch. 33 - What type of split-phase motor does not generally...Ch. 33 - What type of single-phase motor develops the...Ch. 33 - Prob. 14RQCh. 33 - Prob. 15RQCh. 33 - When a repulsion-start induction-run motor reaches...Ch. 33 - Prob. 17RQCh. 33 - What causes the magnetic field to rotate in a...Ch. 33 - How can the direction of rotation of a shaded-pole...Ch. 33 - Prob. 20RQCh. 33 - Prob. 21RQCh. 33 - Prob. 22RQCh. 33 - Prob. 23RQCh. 33 - Prob. 24RQCh. 33 - What is the principle of operation of a stepping...Ch. 33 - What does the term bifilar mean?Ch. 33 - Prob. 27RQCh. 33 - When a stepping motor is connected to AC power,...Ch. 33 - What is the synchronous speed of an eight-pole...Ch. 33 - How can the holding torque of a stepping motor be...Ch. 33 - Why is the AC series motor often referred to as a...Ch. 33 - Prob. 32RQCh. 33 - How is the direction of rotation of the universal...Ch. 33 - Prob. 34RQCh. 33 - Prob. 35RQCh. 33 - Prob. 36RQCh. 33 - Prob. 1PA
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- 5. A stepper motor is being used as a crane motor in an expensive toy. The motor has the following properties: Holding torque = 2.52 kg -cm dynamic torque = 1.440 kg-cm detent torque = 0.360 kg-cm The motor turns a 3.81 cm diameter pulley around which a string is wound. How much weight can the crane lift? How much weight can the crane continue to support with the power on; with the power off?arrow_forwardDiscuss the V/F=constant control method of electric motors.arrow_forward2 (B)- Indicate whether the following statements are true or false and correct the false statements I-A d.c. shunt motor is running with certain load. The effect of adding an external resistance in armature circuit is to increase the motor speed F Constant speed 2- A de series motor develops a torque of 30 N.m at 4 A of load current. if the current is increased to 6 A, the torque developed will be 67.5 N.m T 3-If the two field Windings are wound in such a manner that the fluxes produced by the two always help each other, the motor is called cumulatively compound F 4-The speed of d.c series motor is decreased if the armature current is increased T 5- To solve the Commutation Problem in large machines, this can be achieved by increasing the brush width. Tax In (Rm. Ps)arrow_forward
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