Drive apparatus for driving an oscillator and a powder feeder ha

Details Drive apparatus for driving an oscillator and a powder feeder ha Drive apparatus for driving an oscillator and a powder feeder ha

1997-09-30

2000-04-18

Ellis, Christopher P.

Conveyors: power-driven

Conveyor system having a gravity conveyor section

With means to affect flow

198751, 318128, 318129, 331DIG2, B65G 4719

Patent

active

060503939

ABSTRACT:
Disclosed is the drive apparatus for the powder feeder, which has; the duty ratio control circuit 12 which applies the alternating voltage with the resonance frequency to the vibrator 10 during a time corresponding to the duty ratio; the current monitor 15 which detects the residual frequency of the electro motive force produced due to the residual oscillation of the vibrator 10 when the alternating voltage with the resonance frequency is not applied from the duty ratio control circuit 12 and feeds back the detected residual frequency to the PLL control circuit 11 through the zero-cross comparator 17.

REFERENCES:
patent: 3216557 (1965-11-01), Morris et al.
patent: 4331263 (1982-05-01), Brown
patent: 4395665 (1983-07-01), Buchas
patent: 5477099 (1995-12-01), Suganuma
patent: 5942926 (1999-08-01), Yamaguchi

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