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Dual hybrid demand refrigeration control apparatus

  • US 5,023,531 A
  • Filed: 05/19/1988
  • Issued: 06/11/1991
  • Est. Priority Date: 05/19/1988
  • Status: Expired due to Term
First Claim
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1. A temperature regulating apparatus comprising:

  • a brushless variable speed drive motor coupled to a cooling compressor adapted to cool a location remote from said drive motor, said drive motor including a permanent magnet rotor, a multipole stator and a stator armature with separably energizable windings for successive stator poles;

    a temperature sensor at said remote location, said temperature sensor including an element whose resistance varies with the temperature thereof;

    means for sensing predetermined angular positions of said rotor;

    a motor control network including means for producing a first signal derived from the voltage across said temperature sensor, means for producing a second signal in response to the angular speed of said rotor, and means for feeding a constant current through said resistance varying element;

    a compensation network for adjusting the response of said motor control network to the output of said temperature sensor;

    means for producing a relatively high frequency pulse signal with a pulse width duty cycle being modulated in response to a predetermined relationship of said first and second signals; and

    a commutation network responsive to said rotor position sensing means for energizing said pole windings in a predetermined phase relationship to the position of said rotor and at a level responsive to said high frequency pulse signal, whereby the energization of said armature is responsive to said predetermined relationship of said first and second signals.

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