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Traction motor controller for forklift vehicles

  • US 5,070,283 A
  • Filed: 05/07/1990
  • Issued: 12/03/1991
  • Est. Priority Date: 05/07/1990
  • Status: Expired due to Term
First Claim
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1. Apparatus for decoupling speed and torque of a dc motor having separately excited armature and field windings, said apparatus controlling motor speed of said dc motor independently of torque and torque independently of dc motor speed to the limit of the dc motor commutation curve, in combination, comprising:

  • a) a dc motor having an armature, an armature winding and a field winding, said armature and field windings being independently controlled;

    b) armature voltage amplifying means operatively connected to the armature of said motor for varying voltage applied thereto;

    c) armature current sensing means directly connected to said armature voltage amplifying means for sensing armature current;

    d) field voltage amplifying means operatively connected to the field winding of said motor for varying voltage applied thereto;

    e) motor speed sensing means operatively connected to said armature of said dc motor for generating a signal representative of rotational speed of said motor armature; and

    f) decoupling control means being operatively connected to said motor speed sensing means, to said armature voltage amplifying means and to said field voltage amplifying means for independently controlling the motor speed independently of torque and torque independently of said motor speed to the limit of the commutation curve of said dc motor.

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