Electricity: motive power systems – Impact – mechanical shock – or vibration-producing motors
Patent
1996-11-15
1998-03-31
Stephan, Steven L.
Electricity: motive power systems
Impact, mechanical shock, or vibration-producing motors
318127, 310317, H02N 200
Patent
active
057342369
ABSTRACT:
A drive device for a vibration motor which provides constant efficient driving with a simple circuit and control sequence. The drive device for the vibration motor includes a charging circuit which impresses a predetermined voltage on an electromechanical energy conversion element, a discharge circuit which causes discharge of the electromechanical energy conversion element via an inductive element, a control circuit which alternately connects the charging circuit or the discharge circuit to the electromechanical energy conversion element, and a period detection circuit which detects the period of the resonant frequency of a circuit formed by the electromechanical energy conversion element and the inductive element. The control circuit causes an increase and a decrease of the interval the discharge circuit is connected, such that the interval of connection of the discharge circuit and the period detected by the period detection circuit become equal, causing the drive frequency of the vibration motor to change.
REFERENCES:
patent: 4395665 (1983-07-01), Buchas
patent: 4496884 (1985-01-01), Hamer et al.
patent: 4811835 (1989-03-01), Bullivant et al.
Jones Judson H.
Nikon Corporation
Stephan Steven L.
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