Control method of piezoelectric actuator, position control...

Details Control method of piezoelectric actuator, position control... Control method of piezoelectric actuator, position control...

2006-10-24

2006-10-24

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

Reexamination Certificate

active

07126252

ABSTRACT:
A position control device has a piezoelectric actuator, a power supply for applying voltage to the piezoelectric actuator, a position control unit, and a reverse low voltage control unit. The position control unit identifies a position control state in which position control is performed by displacing the piezoelectric actuator and a standby state that does not require the position control, and controls the position. When the position control unit identifies the standby state, the reverse low voltage control unit sets a reverse low voltage that is directed opposite to the polarization direction of the piezoelectric film and is lower than a coercive voltage and a set time during which the reverse low voltage is applied, and transmits a power supply control signal for generating the set reverse low voltage and set time to the power supply. Thus, a large displacement amount is achieved and a long lifetime can be realized.

REFERENCES:
patent: 6556028 (2003-04-01), Umanskiy et al.
patent: 2002-288954 (2002-10-01), None
patent: 2003-141832 (2003-05-01), None
Yoshikazu Soeno et al., “Piezoelectric Piggy-Back Microactuator for Hard Disk Drive”, IEEE Transactions On Magnetics, vol. 35, No. 2, (Mar. 1999), pp. 983-987.

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