The figure below shows the rotor current of a PMDC motor immediately after a 12V source is connected to it. If the back emf constant (Ke) of this motor is 30 mV/rad/s) then what is the steady state speed of this motor? 1.4 1.2 1 0.8 0.6 Rotor current (Ampere) 0.4 0.2 0 0 0.2 0.4 0.8 0.6 Time (seconds) 1 1.2

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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.