A 50 h.p, 440 V d.c. A shunt motor draws a current of 104 A from the mains when running at full load. The resistances of its shunt field winding and armature winding are 220 ohm and 0.4 ohm respectively. Then find (1) electrical efficiency (2) mechanical efficiency and (3) commercial efficiency of the motor.

Q: 90%. Select one: a. Not on the list b. 100 N-m c. 120 N-m d. 178 N-m

A: Given data: Output Power= 25hp (18.65kW) Speed, N= 1000 r/min

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A: Given: Current, IL=100A, Resistance, Ra=0.04ΩRsh=115ΩRse=0.01Ω Voltage, V=230V

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Q: 1. A 240-V d.c. shunt motor has an armature resistance of 0.4 2 and field resistance of 110 Q. At no…

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Q: dc shunt motor

A: Given- DC shunt motor- Current, IL = 30 A Voltage, Vt = 230 V Efficiency= 80 %  Field resistance…

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A: Armature induced EMF=Terminal voltage ± drop in armature resistance drop in armature…

DC Series Motors

A DC motor is a type of electric motor which converts electric energy into mechanical energy. The forces that are produced by the magnetic field are what those common types of motors rely upon. Either electro-mechanical or electronic, all types of DC motors have some internal mechanism to change the current direction in part of the DC motors. As the DC motors could be powered from existing DC lighting power distribution systems, these motors were the first form of motors widely used. By changing the strength of the current in its field winding or by using a variable supply voltage, the speed of the DC motors can be controlled over a wide range.