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DC motor drive system and method

  • US 5,220,259 A
  • Filed: 10/03/1991
  • Issued: 06/15/1993
  • Est. Priority Date: 10/03/1991
  • Status: Expired due to Term
First Claim
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1. An apparatus for controlling the driver bus current in a DC motor drive system by selectively controlling the switching intervals of a plurality of inverter switches coupled to the motor field windings, comprising:

  • means for manually selecting a set-point torque value defining the desired motor output torque;

    means for monitoring the instantaneous motor driver bus current and developing a motor driver bus current control signal therefrom;

    means for monitoring the motor rotor rotational speed and developing a motor rotor speed control signal therefrom;

    means for modifying said set-point torque value, responsive to said motor rotor speed control signal, to produce a modified set-point torque value;

    means for simulating motor winding phase current by utilizing said motor driver bus current and rotor speed control signals to generate a simulated motor phase current signal;

    means for utilizing said modified set-point torque value and said simulated motor phase current signal, and means for developing an inverter control signal therefrom; and

    means for turning off said inverter switches with said inverter control signal.

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