Explain why a dc motor should not be started by impressing its rated voltage across the armature reaction in a dc motor.
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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 is different to speed regulation – where the speed is trying to be maintained (or ‘regulated’) against the natural change in speed due to a change in the load on the shaft
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