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Energy measuring systems adapted for use in conjunction with load moving and weight indicating devices

  • US 4,053,742 A
  • Filed: 12/20/1976
  • Issued: 10/11/1977
  • Est. Priority Date: 12/20/1976
  • Status: Expired due to Term
First Claim
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1. A system comprising movable load-supporting means, motor driving means, and connecting means connecting said motor means to said load-supporting means, which further comprises apparatus for measuring the energy expended to move said load-supporting means and any load thereon from a first position to a second position, said apparatus comprising:

  • a. means for measuring the motor armature current;

    b. means for measuring the voltage across the motor armature;

    c. first multiplier means for generating an electrical signal corresponding to the square of the motor current;

    d. inverter means for converting the polarity of the electrical signal from said multiplier means (c);

    e. second multiplier means for multiplying the signal from said inverter means (d) by the electrical resistance of the motor armature and generating a signal corresponding to the product thereof;

    f. third multiplier means for multiplying the motor armature current by the motor armature voltage and generating a signal corresponding to the product thereof; and

    g. integrating device means for integrating the signals from said second (e) and said third (f) multiplier means and producing a voltage corresponding to the energy required to move said load-supporting means and any load thereon.

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