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Eddy current drive dynamic braking system for heat reduction

  • US 5,149,998 A
  • Filed: 08/23/1991
  • Issued: 09/22/1992
  • Est. Priority Date: 08/23/1991
  • Status: Expired due to Fees
First Claim
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1. A dynamoelectric machine braking system for reduced drive motor heating comprising:

  • a dc power source for supplying dc electrical power;

    an ac power source for supplying ac electrical power;

    an ac electric drive motor having a motor output shaft and a motor coil electrically connected to said ac power source;

    an eddy current coupling comprising, a rotor member rotatable about an axis of rotation, an inductor means drivingly attached to said motor output shaft and rotatable about said axis of rotation relative to said rotor member, a coupling coil means connected to said ac power source for producing an electromagnetic field thereby electromagnetically coupling said rotor member and said inductor means, an output shaft having a first end connected to said rotor member and a second end connectable to an inertial load whose motion is to be braked;

    motor switch means for connecting said motor to said ac power source and for connecting said motor to said dc power source; and

    control means for controlling the state of said motor switch means and for directing said ac power source to said coupling coil means when the amplitude of said ac power source directed to said coupling coil means is reduced to substantially zero thereby decoupling said rotor member from said inductor drum and when said control means directs said motor switch means to connect said motor coil to said dc power source until the rotational speed of said motor is substantially reduced in value, and wherein said control means increases the amplitude of said ac power source to said coil means to electromagnetically recouple said rotor member to said inductor drum thereby effectuating a braking action on said inertial load while dissipating an increased quantity of heat in said eddy current coupling.

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