VIBRATING FEEDER CONTROL APPARATUS AND VIBRATING FEEDER
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United States of America Patent
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Feb 26, 2016
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Mar 5, 2015
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Abstract
A vibrating feeder control apparatus used for driving a vibrating feeder main body (1) includes a base (11), a movable body (12) elastically supported by the base, an electromagnet (14) provided on the base, and a magnetic core (15) provided on the movable body to oppose the electromagnet. The PWM signal generation unit (33) generates a PWM signal based on a set drive frequency (f) and applies a pseudo AC voltage corresponding to the PWM signal to the electromagnet. The current detection unit (34) detects a current flowing in the electromagnet by a pseudo AC voltage. The current change rate generation unit (35, 36) generates a current change rates (Rθ1, Rθ2) at a predetermined reference phase angle (θ1, θ2) within one cycle of the pseudo AC voltage. The frequency correction unit (37) corrects the drive frequency based on a current change rate at a reference phase angle.
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