Dispensing – Automatic control – Motor control
Patent
1979-11-30
1982-05-25
Scherbel, David A.
Dispensing
Automatic control
Motor control
198769, 318132, 318133, B65G 2724, H02K 3300
Patent
active
043312632
ABSTRACT:
A control unit for controlling a vibratory bowl feeder which is effective to maintain, for varying feeder loads, a constant preselected amplitude of bowl feeder vibration at a vibratory frequency which coincides with the changing mechanical resonant frequency of the feeder system. The control unit includes a sensor which detects the amplitude and frequency of feeder bowl vibration, a frequency control loop and an amplitude control loop. The frequency control loop is responsive to the detected frequency of vibration and provides an oscillating signal which coincides with the resonant frequency of the system. The amplitude control loop is responsive to the detected amplitude of vibration and includes a variable gain amplifier which amplifies the oscillating signal to provide a feeder driving signal which causes the feeder to vibrate at the system resonant frequency at a preselected amplitude. The sensor for detecting amplitude and frequency of the bowl vibration is preferably a device for sensing the third harmonic of the drive current in the electromagnetic drive of the system. A variable capacitive reactance coupling circuit between the power drive amplifier as the electromagnetic drive of the system is set to match the inductive reactance of the electromagnetic drive.
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Basic Electrical Engineering, by E. A. Fitzgerald, ScD. Chapter 7, pp. 148-150, McGraw-Hill Book Company, Inc. (1945).
Christopher Scientific Co., Inc.
Scherbel David A.
Wacyra Edward M.
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