Drive method for piezoelectric actuator, drive apparatus for...

Details Drive method for piezoelectric actuator, drive apparatus for... Drive method for piezoelectric actuator, drive apparatus for...

2005-07-12

2008-03-25

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07348708

ABSTRACT:
The frequency of a drive signal supplied to a piezoelectric actuator91is swept within a specific range, the consumption current of the piezoelectric actuator91is determined, and when the consumption current is equal to or greater than a reference value, the frequency of the drive signal supplied to the piezoelectric actuator91is shifted proportionate to a specific frequency and returned to its initial value, and the frequency sweep is continued. The resonance frequency component can be removed when the frequency of the drive signal supplied to the piezoelectric element is swept. Consequently, the piezoelectric element can be driven outside of the resonance frequency range at which the consumption current is highest, allowing extreme increases in the consumption current to be prevented and system failures due to the flow of an excessive consumption current to be avoided.

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