Example 2: A 220V shunt motor runs at 800rpm and takes an armature current of 50A. find the resistance to be added to the field circuit to increase the speed to 1000rpm at an armature current of 80A. Armature and shunt field resistances are 0.0150 and 2500 respectively.

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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.