A 220-V shunt motor draws 10 A at 1800 rpm. The armature-circuit resistance is 0.2 Ωand the field-winding resistance is 440 Ω. The rotational loss is 180 W. Determine(a) the back emf, (218.1 V)(b) the driving torque, (10.99 Nm)(c) the shaft torque, and (10.03 Nm)(d) the efficiency of the motor. (85.9%) If the torque developed by the above motor is 20 N-m, determine its(a) speed, (1789.587 rpm)(b) line current, and (17.78 A)(c) efficiency. (91%)Assume that the armature reaction is zero and the rotational loss is proportional to the speed.
A 220-V shunt motor draws 10 A at 1800 rpm. The armature-circuit resistance is 0.2 Ωand the field-winding resistance is 440 Ω. The rotational loss is 180 W. Determine(a) the back emf, (218.1 V)(b) the driving torque, (10.99 Nm)(c) the shaft torque, and (10.03 Nm)(d) the efficiency of the motor. (85.9%) If the torque developed by the above motor is 20 N-m, determine its(a) speed, (1789.587 rpm)(b) line current, and (17.78 A)(c) efficiency. (91%)Assume that the armature reaction is zero and the rotational loss is proportional to the speed.
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 13RQ: A squirrel-cage induction motor is operating at 1175 RPM and producing a torque of 22 Ib-ft. What is...
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A 220-V shunt motor draws 10 A at 1800 rpm. The armature-circuit resistance is 0.2 Ωand the field-winding resistance is 440 Ω. The rotational loss is 180 W. Determine
(a) the back emf, (218.1 V)
(b) the driving torque, (10.99 Nm)
(c) the shaft torque, and (10.03 Nm)
(d) the efficiency of the motor. (85.9%)
If the torque developed by the above motor is 20 N-m, determine its
(a) speed, (1789.587 rpm)
(b) line current, and (17.78 A)
(c) efficiency. (91%)
Assume that the armature reaction is zero and the rotational loss is proportional to the speed.
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