Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 43, Problem 2RQ
To determine
Type of AC motor that can be directly coupled with a larger horsepower rating at low rpm
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A motor has a nameplate hp of 1 at 1736 rpm.
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Chapter 43 Solutions
Understanding Motor Controls
Ch. 43 - What are the disadvantages of low-speed, directly...Ch. 43 - Prob. 2RQCh. 43 - What three alignment checks should be made to...Ch. 43 - Prob. 4RQCh. 43 - Induction motors should not be used below a...Ch. 43 - What is the primary reason for using a pulley...Ch. 43 - How tightly should V-belts be adjusted?Ch. 43 - Refer to Figure 436 and assume the motor is to...Ch. 43 - A machine delivered for installation has a 2-inch...
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- Name three factors that determine the amount of torque developed by a wound rotor induction motor.arrow_forwardA motor develops 225 ft-lb of torque at 860 RPM. What is the horsepower output of the motor?arrow_forwardThe nameplate of a motor lists the frame as 256T. What is the distance from the base of the motor to the center of the shaft?arrow_forward
- Why can a multispeed fan motor be operated at lower speed than most induction motors without harm to the motor windings?arrow_forwardWhen a repulsion-start induction-run motor reaches about 75% of rated full-load speed, it stops operating as a repulsion motor and starts operating as a squirrel-cage motor. What must be done to cause the motor to begin operating as a squirrel-cage motor?arrow_forwardWhat type of commutator is used with a brush-lifting repulsion-start induction-run motor?arrow_forward
- A motor nameplate indicates an insulation temperature rating of F. What is the temperature rating of this insulation?arrow_forwardA 1750 rpm motor has a 3” pitch diameter drive pulley. It is driving a 9” pitch diameter pulley. What would be the rpm of the driven pulley?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
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