Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 37, Problem 2RQ
To determine
Identify the rating used to find the full-load running current of a torque motor.
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Name three factors that determine the torque produced by an induction motor.
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Understanding Motor Controls
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- 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_forwardA motor develops 225 ft-lb of torque at 860 RPM. What is the horsepower output of the motor?arrow_forwardName three factors that determine the amount of torque developed by a wound rotor induction motor.arrow_forward
- What type of commutator is used with a brush-lifting repulsion-start induction-run motor?arrow_forwardA motor develops 189 ft-lb of torque at 1745 RPM. What is the horse-power output of the motor?arrow_forwardName three factors that determine the amount of voltage induced in the rotor of a wound-rotor motor.arrow_forward
- A motor nameplate indicates an insulation temperature rating of F. What is the temperature rating of this insulation?arrow_forwardQ A motor of 15 horsepower, has a code letter L, and is operated on a 400-volt line. Find the locked rotor currentarrow_forwardCan someone please help me to solve the following question showing all work. Thank youarrow_forward
- What is the most common NEMA design code found on squirrel- cagetype motors?arrow_forwardWhat are the disadvantages of low-speed, directly coupled induction motors?arrow_forwardA 50 Hz pump drive requires a torque of 70 Nm approx. at 1450 rpm approx. for 1 minute followed by 5 minutes running unloaded. This cyclic pattern is repeated continuously. The motor is to be selected from a range of general-purpose motors with continuous ratings of 2.2, 3, 4, 5.5, 7.5, 11, 15 and 20 kW. The motors have a pull-out torque of 200%. 1. Select the pole number. 2. Calculate the continuous power rating. 3. 4. Calculate the required power rating given the pull out torque rating. Estimate the slip when the motor drives the pump at the required speed. Choose the motor from the range of options that is most fit for purpose. 5. Enter your answers in the units indicated (without unit symbols) corrected if necessary to two decimal places. Answer: Number of poles= ✓ Continuous power rating (kW)= Required power rating for 200% pull out torque (kW)= Percentage slip (%) = Most suitable motor from given range (kW)-arrow_forward
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