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Constant amplitude controller and method

  • US 4,300,083 A
  • Filed: 03/19/1979
  • Issued: 11/10/1981
  • Est. Priority Date: 07/05/1977
  • Status: Expired due to Term
First Claim
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1. In combination, a vibrating apparatus including solenoid means for inducing a vibration mode to the vibratory apparatus and a constant amplitude controller for supplying voltage from an A.C. source to the solenoid means to operate the same to induce the vibration mode of a desired amplitude to the vibratory apparatus, said constant amplitude controller comprising:

  • power control means for regulating the voltage to said solenoid means in response to a control signal;

    said power control means having two power terminals and a control signal receiving terminal, said power terminals being connected in series between said A-C source and said solenoid means,transducer means mechanically coupled to said vibratory apparatus for providing a transducer signal representatively proportioned to reflect the actual amplitude of said vibratory apparatus,operator input means for transulating the desired amplitude of said vibratory apparatus to a reference signal,control logic means including error detector means and a summing means,said error detector means electrically connected to the output of said operator input means for receiving said reference signal and to the output of said transducer means for receiving said transducer signal,said error detector means operative to provide an error-correct signal varying with the difference between said reference signal and said transducer signal,said summing amplifier electrically coupled to the output of said operator input means to receive said reference signal and electrically coupled to said error detector means for receiving said error-correct signal,said summing amplifier operative to sum said reference signal and said error-correct signal to produce as an output said control signal,said power control means electrically coupled to said control logic means for receiving said control signal,power supply means for providing D.C. voltage to power said control logic means,whereby a feedback control system for said vibratory apparatus provides regulation to adjust the actual amplitude level to the desired amplitude level.

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