Often we want to control the speed of a DC motor on demand. This intentional change of drive speed is known as speed control of a DC motor.
Speed control of a DC motor is either done manually by the operator or by means of an automatic control device.
This video shows how field control can be performed on a DC shunt motor to vary its speed. In this method, speed variation is accomplished by means of a variable resistance inserted in series with the shunt field. An increase in controlling resistances reduces the field current with a reduction in flux and an increase in speed.
Do refer the above video for any clarifications of any kind. If you still have any queries, post them down in the comments sections and we shall get back to you at the earliest.
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