Industrial Motor Control
7th Edition
ISBN: 9781133691808
Author: Stephen Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 36, Problem 3RQ
A squirrel-cage motor produces 1100 pound-feet of torque at starting when full voltage is applied to the motor. If the voltage is reduced to 50% during starting, how much starting torque will the motor develop?
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Chapter 36 Solutions
Industrial Motor Control
Ch. 36 - List five common starting methods for three-phase...Ch. 36 - Prob. 2RQCh. 36 - A squirrel-cage motor produces 1100 pound-feet of...Ch. 36 - What is the most common device used to disconnect...Ch. 36 - Prob. 5RQCh. 36 - Prob. 6RQCh. 36 - Prob. 7RQCh. 36 - Prob. 8RQCh. 36 - Prob. 9RQCh. 36 - Prob. 10RQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- A motor is operating a load that requires a torque of 750 lb–in and is turning at a speed of 1,575 RPM. How much horsepower is the motor producing?arrow_forwardA motor develops 225 ft-lb of torque at 860 RPM. What is the horsepower output of the motor?arrow_forwardGiven the following experimental data collected, what is the approximate torque of this motor at peak efficiency?arrow_forward
- When 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 is the frequency (in Hz) of a motor spinning at 1740 rpm?arrow_forwardFind the horsepower rating of a motor running at 1,500 rpm and developing a torque of 105 lb–ft. (a). 22 (b). 28 (c). 30 (d). 36arrow_forward
- A motor, operating clockwise is coupled through a belt drive to rotate an industrial exhaust fan at 500 rpm. The diameter of the motor sheave is 4 in. and the sheave on the fan is 14 in. Determine the belt speed.arrow_forwardA 7460 W split-phase motor running at 1750 rpm is used to drive a rotary pump. The pump should run continuously at approximately 1175 rpm. The center distance should not exceed 1118 mm. Space limits the diameter of the driven pulley to 292 mm. Determine: a. the pulley diameters, b. the belt size, and c. the number of belt required.arrow_forwardBriefly explain the effect of the torque taken by the device that loads the motor on the variation of the torsional work and the smoothness of the motor.arrow_forward
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