Control apparatus for vibration type actuator, vibration...

Details Control apparatus for vibration type actuator, vibration... Control apparatus for vibration type actuator, vibration...

2005-04-26

2005-04-26

Budd, Mark (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

C310S316020, C310S323020

Reexamination Certificate

active

06885132

ABSTRACT:
A control apparatus for a vibration type actuator is disclosed, with which at least three kinds of vibrations are excited, and a desired motion can be carried out with high efficiency. The vibration type actuator includes a rotatable moving member, an elastic member contacting the moving member, and an electro-mechanical energy conversion element exciting at least three different kinds of vibrations in the elastic member by supplying at least three periodic signals having different phases. The control apparatus includes a rotation axis determining unit, a parameter determining unit and a control circuit. The rotation axis determining unit determines a rotation axis for rotating the moving member. The parameter determining unit determines, by using an inverse model, phase and amplitude of the periodical signals.

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patent: 11-220892 (1999-08-01), None

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