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Motor control circuit for a simulated weight stack

  • US 5,117,170 A
  • Filed: 04/20/1990
  • Issued: 05/26/1992
  • Est. Priority Date: 12/23/1985
  • Status: Expired due to Term
First Claim
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1. An exercise machine having a user interface engaged by the user for simulating a weight stack comprising:

  • a DC motor coupled to the user interface to exert a counterforce that simulates the weight of a weight stack;

    means for sensing the displacement of the user interface to provide a displacement signal proportional thereto; and

    means responsive to said displacement signal for controlling said motor to provide a force which starts increasing from a first value at a rest position and gradually increases to said counterforce in response to movement of the interface through an initial displacement from said rest position.

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