Electrical Transformers and Rotating Machines
4th Edition
ISBN: 9781305494817
Author: Stephen L. Herman
Publisher: Cengage Learning
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Chapter 15, Problem 19RQ
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?
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A motor is operating a load that requires a torque of 750 pounds per inch and is turning at a speed of 1575 RPM. How much horsepower is the motor producing?
A motor operating at 3450 rpm and is producing a torque of 33 lb in.what is the output horsepower of the motor?
What is the least power requirement for a motor capable of lifting 500 lb at a constant speed
of 15 ft/s.
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Electrical Transformers and Rotating Machines
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- please helparrow_forwardCalculate the percentage speed regulation of a motor at full load if the machine runs at 1000 rpm at no-load and the full load speed is 900 rpm.arrow_forwardthe figure shows a motor driving a two-output transmission system. The blower requires a certain amount of force to operate since the drum rotates at an angular acceleration of 0.03 rad/s2. Determine the torque produced by a motor with a torque of 700 Nm and a speed of 1,600 rpm. following:- The power produced at the drum (P). The torque requirement for the blower to operate (Tblower) and power generation (Pblower) The overall efficiency transmission of the gear system, hO. If the speed of motor is NOT given, explain without calculation how the overall efficiency transmission of the gear system can be obtained. Given:- Number of gear teeth, t:- t1=40 ; t2=200 ; t3=50 ; t4=200 ; t5=40 ; t6=120 ; t7=60 and t8=120 Equivalent mass moment of inertia, Ieq:- Imotor,5=25 kgm2 ; I23=10 kgm2 ; Iblower,4=15 kgm2 ; I67=20 kgm2 and Idrum,8=60 kgm2 Friction torque in bearing, Fb:- A=F=25 Nm ; I=J =20 Nm ; B=C=G=H=5 Nm and D=E=10 Nm Efficiency of all gear mesh, ⴄ=85%arrow_forward
- In a no-load motor, a constant electromagnetic torque of 5 Nm is generated at t = 0. The engine reached 1800 revs in 4 seconds. Calculate motor inertia ignoring friction.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_forwardA belt-driven blower assembly is equipped with a motorthat turns a 5-in. drive pulley at a speed of 3450 rpm.The blower is turning at a speed of 1725 rpm. Determinethe size of the driven pulley.arrow_forward
- If the line of best fit for your torque speed curve is described by the following equation, calculate the no-load speed of the motor. T= -0.012x+0.28arrow_forwardWhat is the minimum pulley diameter for a 1 HP motor running at 1750 RPM?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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