Method and apparatus for controlling the drive of self-excited v

Details Method and apparatus for controlling the drive of self-excited v Method and apparatus for controlling the drive of self-excited v

1994-06-16

1995-12-05

Bidwell, James R.

Conveyors: power-driven

Conveyor system for arranging or rearranging stream of items

By laterally or vertically moving successive items in...

198756, B65G 2732

Patent

active

054720796

ABSTRACT:
A drive control method for a self-excited vibrating parts feeder which includes a parts feeder unit and a drive power supply for supplying an electric power of a desired frequency to an electromagnetic vibration generating unit to exert vibrations to the parts feeder unit, the method comprising the steps of: sweeping the voltage of the drive power supply through a predetermined frequency range; detecting a maximum value of a change in the current flowing through an exciting coil of the electromagnetic vibration generating unit while the voltage of the drive power supply is swept; driving the parts feeder at a frequency which generates said maximum value; comparing a current varying within the predetermined frequency range with a predetermined current; and controlling a drive current of the drive power supply so that the varying current and the predetermined current are identical, thereby controlling the vibration amplitude. The parts feeder is always driven at a resonant frequency and with a constant vibration amplitude, without providing a detector mounted on the parts feeder body and without presetting a natural frequency at the time of manufacture of the parts feeder.

REFERENCES:
patent: 3716130 (1973-02-01), Morris
patent: 4216416 (1980-08-01), Grace
patent: 4331263 (1982-05-01), Brown
patent: 4811835 (1989-03-01), Bullivant et al.
patent: 4921090 (1990-05-01), Gregor
patent: 5074403 (1991-12-01), Myhre

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