Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 17, Problem 6RQ
Name three factors that determine the torque produced by an induction motor.
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A three phase induction motor
operates with a rotor speed of 1440
rpm and develops a torque of
66.32NM at full load. The full load
power output is *
O 10 kw
O 9 kw
O 8 kW
O 11 kW
An industrial fan running at 600 rpm is driven by a 25 kW, 960 rpm, induction motor. The pulley mounted on the motor shaft is 270 mm. Center to center distance is 1.45 m and use f = 0.35. Determine the length of leather belt
Find 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). 36
Chapter 17 Solutions
Electrical Transformers and Rotating Machines
Ch. 17 - Prob. 1RQCh. 17 - Prob. 2RQCh. 17 - What is synchronous speed?Ch. 17 - What two factors determine synchronous speed?Ch. 17 - Name three factors that cause the magnetic field...Ch. 17 - Name three factors that determine the torque...Ch. 17 - Is the synchronous motor an induction motor?Ch. 17 - What is the amortisseur winding?Ch. 17 - Prob. 9RQCh. 17 - Prob. 10RQ
Ch. 17 - Prob. 11RQCh. 17 - Why can an induction motor never operate at...Ch. 17 - Prob. 13RQCh. 17 - Prob. 14RQCh. 17 - Prob. 15RQCh. 17 - Prob. 16RQCh. 17 - Prob. 17RQCh. 17 - Prob. 18RQCh. 17 - Prob. 19RQCh. 17 - Prob. 20RQCh. 17 - How is the speed of a consequent pole...Ch. 17 - A three-phase squirrel-cage motor is connected to...
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- Name three factors that determine the amount of torque developed by a wound rotor induction motor.arrow_forwardWhat are the disadvantages of low-speed, directly coupled induction motors?arrow_forwardA motor develops 189 ft-lb of torque at 1745 RPM. What is the horse-power output of the motor?arrow_forward
- A motor develops 225 ft-lb of torque at 860 RPM. What is the horsepower output of the motor?arrow_forwardQuestion 2 Beli vifth Slack side Motor (imprut) Tight side Beli thickpess\ Centre distance Figure 2 Figure 2 shows an open flat belt drive connected to a motor and a pulley. The motor transmits 20 kw to the connect pulley of 450 mm diameter and is rotating at 850 r/min to a second pulley rotating at 400 r/min. The distance between pulley centres is approximately 2 m. The belt is 6 mm thick and has a density of 970 kg/m. The maximum stress in the belt is not to exceed 2,7 MPa. The coefficient of friction for both pulleys is 0,3. Determine: 2.1. The diameter of the second pulley. 2.2. The length of the belt. 3.3. The width of the belt taking centrifugal tension into account.arrow_forwardA motor operating at 3450 rpm and is producing a torque of 33 lb in.what is the output horsepower of the motor?arrow_forward
- A 480V, 3-phase, 50Hz 6-pole Induction motor with a rated power of 10KVA. (i) Calculate the synchronous speed in rad/sec (ws) (ii) Determine the rotor speed in rpm, if the % slip is 2.5%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_forwardGiven the following experimental data collected, what is the approximate torque of this motor at peak efficiency?arrow_forward
- What type of single-phase motor develops the highest starting torque?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_forwardThe name plate data of three-phase induction motor has the following data: 25 H.P., P= 4, 50 Hz, Y , 380 V, 38 A, Efficiency = 0.86, Service Factor = 1.1 At rated condition of operation, if the total stator losses are 1900 W, windage & friction losses are 600 W, Determine: 1. Maximum allowable load 2. Input power 3. Input power factor 4. Total lossesarrow_forward
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