The ERRU 4.5 kW used in Indian Railway AC, non AC coaches receives the 3-phase AC voltage generated from a brushless alternator. The output of the alternator is AC in nature with variable voltage and variable frequency depending on the motion of the train. This AC voltage is rectified and passed through the controller to generate regulated DC voltage as required for AC and non AC coaches. It also charges a battery bank through a voltage and current controller.
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