Circuit for driving an oscillatory-wave motor

Details Circuit for driving an oscillatory-wave motor Circuit for driving an oscillatory-wave motor

1993-01-05

1994-10-11

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

318116, H01L 4108

Patent

active

053550471

ABSTRACT:
A circuit for driving an oscillatory-wave motor, which generates traveling oscillatory waves on a surface of an elastic body by applying a drive frequency voltage to an electro-mechanical energy conversion element securely fixed to the elastic body to drive a movable body in friction-contact with the surface of the elastic body, includes: an electro-mechanical energy conversion element, securely fixed to the elastic body, for detecting an oscillation frequency during the driving of the oscillatory-wave motor; a feedback signal output device for outputting feedback signals on the basis of the output of the element; an optimum drive-frequency detection device for detecting an optimum drive frequency of the oscillatory-wave motor only on the basis of the feedback signals; and an automatic drive-frequency tracking circuit for outputting detected values from the detection device as voltage values to a voltage control oscillator for generating drive frequency voltage signals.

REFERENCES:
patent: 4743788 (1988-05-01), Takagi et al.
patent: 4833358 (1989-05-01), Suzuki et al.
patent: 4888514 (1989-12-01), Takahashi et al.
patent: 4952834 (1990-08-01), Okada
patent: 5013982 (1991-05-01), Sasaki
patent: 5053669 (1991-10-01), Saeki et al.
patent: 5061882 (1991-10-01), Takagi

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