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TRACTION MOTOR SPEED REGULATION FOR PROPULSION SYSTEMS PROVIDING SMOOTH STEPLESS CHANGES IN SPEED AND AUTOMATIC WHEEL SLIP CONTROL

  • US 3,764,867 A
  • Filed: 11/14/1972
  • Issued: 10/09/1973
  • Est. Priority Date: 11/14/1972
  • Status: Expired due to Term
First Claim
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1. In a traction motor torque regulator for propulsion systems employing multiple series type direct current traction motors having the field and armature windings thereof connected in series electrical circuit relationship and with which smooth stepless changes in speed of operation of the traction motors is provided, the improvement comprising variable impedance means connected in series circuit relationship with the respective serially connected field and armature windings of the traction motors across a main power source of direct current excitation, main power control means for variably controlling the value of said variable impedance means to thereby variably control the torque of the direct current traction motors, means for supplying a separate excitation source of direct current connected across the respective field windings of the direct current traction motors in parallel with and in addition to the main power source, and ancillary control means for varying the magnitude of the separate direct current excitation supplied through the respective field windings independently of and in conjunction with the main power control means, the separate excitation source of direct current being connected across the respective field windings of the traction motors with a polarity such that the separate direct current excitation adds to the normal excitation direct current supplied to the respective field windings by the main power source through the variable impedance means and the ancillary control means controls the magnitude of the separate direct current excitation supplied to the respective field windings in a manner to control the armature current and hence the tractive effort of the respective traction motors whereby smooth stepless changes in speed of the traction motors can be achieved with the regulator.

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