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Method and apparatus for regulating the differential rpm of two rotating parts

  • US 4,369,915 A
  • Filed: 02/13/1981
  • Issued: 01/25/1983
  • Est. Priority Date: 02/15/1980
  • Status: Expired due to Fees
First Claim
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1. A method for regulating the differential rpm of a centrifuge drum and an internally disposed worm conveyor in a worm centrifuge, said drum and said conveyor rotating at different speeds comprising the steps of:

  • measuring the individual speeds of said drum and conveyor;

    supplying electronic signals corresponding to the measured speeds of said drum and said conveyor to a microprocessor;

    generating a pulse train for each of said drum and said conveyor having pulses corresponding to one rotation of said drum and said conveyor;

    sampling said pulse train at a frequency greater than the rotational frequency of said drum and said conveyor;

    counting the number of samplings between two or more pulses received in said microprocessor;

    calculating a quotient corresponding to said number of samplings for each pulse train;

    calculating a differential rpm between said drum and said conveyor from the quotients for said pulse trains;

    comparing said calculated differential rpm to an optimum rpm value; and

    supplying a signal to a means for changing the rotational speed of said worm conveyor if said calculated differential rpm deviates from said optimum rpm.

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