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Electronic motor load sensing device

  • US 5,473,497 A
  • Filed: 02/05/1993
  • Issued: 12/05/1995
  • Est. Priority Date: 02/05/1993
  • Status: Expired due to Term
First Claim
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1. A device adapted to be connected to a motor which is coupled to a load for measuring energy delivered by the motor to the load, wherein the motor is adapted to be connected between first and second power supply lines connected to a power source, the device comprising:

  • developing means for developing first and second electrical signals indicative of first and second parameters of power delivered to the load;

    pulse width modulating means for pulse width modulating the first electrical signal to produce a pulse width modulated first electrical signal;

    modulating means responsive to the pulse width modulated first electrical signal for modulating the second electrical signal to produce a power waveform; and

    producing means responsive to the power waveform for producing an output signal indicative of the energy delivered by the motor to the load.

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