The armature of a 230 Volts shunt motor has a resistance of 0.18 ohm. A resistance is inserted in series with the armature at the instant of starting so as not to exceed 76 Amp at starting. calculate the value to which this resistance can be reduced when the armature accelerates until Ec is 168 volts. Brush drop is 2 Volts.

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Speed control of motor

Speed control by DC motor-speed controller is required to realize variable speed drive. Whenever a motor drives a particular load, it is called drive, and variable speed drive refers to a load requiring variable speed. All this is obtained by a DC motor speed controller.