The armature resistance of a shunt motor fed from a 220 Volt DC source is 5 ohms and the resistance of the excitation winding is R ohm and it rotates stably. Then, a resistance of R ohm is added to the excitation circuit (a resistor with the same value as the winding resistance) to control the speed. How many RPM is the motor in the last state in steady state. Mechanical losses will be neglected, motor magnetically linear, no saturation, temperature change will be neglected. Armature current = Ia = 4 A Load torque=Tload= 7 Nm

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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.