EBK ELECTRICAL TRANSFORMERS AND ROTATIN
4th Edition
ISBN: 9781337025867
Author: Herman
Publisher: VST
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Textbook Question
Chapter 20, Problem 5RQ
What is the most common NEMA design code found on squirrel- cage–type motors?
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A 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)-
Name three factors that determine the torque produced by an induction motor.
26. Explain the principles of DC motors, including the DC permanent magnet motor and how it can
have speed control. (10 marks)
Chapter 20 Solutions
EBK ELECTRICAL TRANSFORMERS AND ROTATIN
Ch. 20 - Prob. 1RQCh. 20 - Prob. 2RQCh. 20 - Prob. 3RQCh. 20 - A motor nameplate indicates an insulation...Ch. 20 - What is the most common NEMA design code found on...Ch. 20 - A motor develops 225 ft-lb of torque at 860 RPM....Ch. 20 - The nameplate of a motor lists the frame as 256T....Ch. 20 - A motor develops 189 ft-lb of torque at 1745 RPM....Ch. 20 - Prob. 9RQCh. 20 - A motor nameplate lists the voltage as...
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- What type of single-phase motor develops the highest starting torque?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_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_forward
- Problem 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_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. design a. the pulley diameters, b. the belt size, and c. the number of belt required.arrow_forwardName three factors that determine the amount of torque developed by a wound rotor induction motor.arrow_forward
- State four advantages of a pre-engaged starter when compared with an inertia type.arrow_forwardTO THE NEXT PROBLEM Design a complete belt drive system for an AC motor (NT) running a fan 12 hrs/day, with an input power 10 hp and input speed of 1000 RPM. The desired output RPM and center distances are 500 RPM and 36 inch, respectivelyarrow_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
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