National Mine Service Company

Rowland A Hill

Bonne W Posma

An electric powered vehicle or the like includes a first mechanical drive system for a first side of the vehicle and a second mechanical drive system for a second side of the vehicle. A first DC motor and a second DC motor are respectively coupled to the first mechanical drive system and the second mechanical drive system. A source of DC power is on the vehicle. The first DC motor has a first field and a first armature and the second DC motor has a second field and a second armature. The first field, the first armature, the second field, and the second armature are connected in a series circuit with the source of power. A voltage sensing relay across the first armature can detect a high voltage across the first armature to sense a loss of traction of the first mechanical drive system. A switching circuit is employed to disable the first motor from the series circuit in response to the voltage sensing relay. There is also included a method for providing propulsion for an electric powered vehicle when a mechanical drive system at one side thereof experiences a loss of traction.

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Wortland, KY, United States of America

Rowland A Hill