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Method and apparatus for measuring and indicating the unbalance of a rotor

  • US 4,109,312 A
  • Filed: 04/08/1977
  • Issued: 08/22/1978
  • Est. Priority Date: 02/07/1974
  • Status: Expired due to Term
First Claim
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1. A circuit arrangement for the digital display of unbalance representing analog input signals derived from a rotor rotating at a given rpm, comprising analog input signal distributor means for receiving said analog input signals, source means of reference signals, control circuit means, signal integrating means and polarity determining circuit means connecting said input signal distributor means to said control circuit means in that order, clock pulse generator means and counter means connected to said control circuit means to determine the duration of each signal integration by said integrating means for deriving digital signals corresponding to said analog input signals, a plurality of memory means, said control circuit means being connected to supply digital values corresponding to said digital signals to said memory means, a corresponding plurality of indicator units, means interconnecting each of said indicator units with a respective memory means, and constant display means connected to said control circuit means and to said indicator units, said constant display means including selector switch means for selecting a number of characteristic constant values to be displayed corresponding to the dimension of an unbalance, wherein said selector switch means provide a selectable switch position for each characteristic value, and wherein said constant display means comprise logic signal combining means connected to said selector switch means for combining the signals received from said selector switch means in accordance with said characteristic constant values, said logic signal combining means being further connected to receive control signals from said control circuit means to determine the storing of combined signals in said logic signal combining means, said logic signal combining means further comprising decoder means for decoding the combined signals, said decoder means being connected to said indicator units for determining the digital display of the unbalance representing signals with their respective units and the decimal point position.

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