Armature Resistance Control Method

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 Armature Resistance Control Method

This is the most common method employed. Here the controlling resistance is connected directly in series with the supply of the motor as shown in the fig.




The power loss in the control resistance of DC series motor can be neglected because this control method is utilized for a large portion of time for reducing the speed under light load condition. This method of speed control is most economical for constant torque. This method of speed control is employed for DC series motor driving cranes, hoists, trains etc.

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