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VEHICLE DRIVE WITH TWO ELECTRIC MOTORS

  • US 3,870,935 A
  • Filed: 02/13/1973
  • Issued: 03/11/1975
  • Est. Priority Date: 08/06/1971
  • Status: Expired due to Term
First Claim
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1. In an electrically operated vehicle having a pair of driving wheels on opposite sides of the vehicle, a source of electric current, and respective motors operatively connected to said wheels, the improvement which comprises a control circuit connected between said source and said motors and including driving-pulse generating means in circuit with said source, respective switches connecting said generating means to said motors in parallel and operable to cut off one of said motors selectively to enable differential rotation of said wheels, each of said motors being a series-wound direct current motor having a field winding and an armature connected in series with one another, each of said switches being connected in series with the field winding and armature of a respective motor at one side thereof, the series network of field winding, switch and armature of both motors being connected together on one side thereof via a common conductor, a sensor provided in circuit with said common conductor and connected in a feedback path to said pulse generating means each of said field windings including a pair of field coils respectively excitable for driving the respective motor in opposite senses, each switch associated with the respective motor including a switch member in series with a coil of the respective pair, a free running diode connected between said common conductor and said pulse generating means across at least one of said motors, and at least one armature diode connected between said common conductor and across at least one of said armatures between said one of said armatures and the respective field winding.

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