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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Question 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.
A motor operating at 3450 rpm and is producing a torque of 33 lb in.what is the output horsepower of the motor?
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%
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 225 ft-lb of torque at 860 RPM. What is the horsepower output of the motor?arrow_forward
- A motor develops 189 ft-lb of torque at 1745 RPM. What is the horse-power output of the motor?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_forwardWhat type of single-phase motor develops the highest starting torque?arrow_forward
- The 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_forwardA soft start electrical motor that delivers 21,43 KW at 1440 rpm must be connected to a stone crusher (hammer mill type) via a wedge belt drive. The crusher must operate 24 hours per day at a recommended shaft speed of 503,5 rpm,while the centre line distance must not exceed 1000 mm. The crusher shaft is 50 mm in diameter. 1.State the product design specification considering the functionality as a design factor. 2.Use the Fenner catalogue to specify the type and number of wedge belts required for the drive 3.Draw and label all critical parts of the belt drive according to the information provided abovearrow_forwardThe reason why the starting torque of a series motor is higher than a shunt motor is because the series motor has O more current flowing through its armature O a stronger net magnetic field around both coils during the inrush of stator currentarrow_forward
- Name three factors that determine the amount of voltage induced in the rotor of a wound-rotor motor.arrow_forward7. Who among the following got a patent for an induction motor in 1888? A. Newton B. Torilcelli C. Nichola Tesla D. Thomas Edisonarrow_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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