Piezoelectric drive device, driving method thereof, robot, and driving method thereof

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United States of America Patent

PATENT NO 9827672
SERIAL NO

15043676

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ATTORNEY / AGENT: (SPONSORED)

Importance

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Abstract

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A piezoelectric drive device includes a piezoelectric drive portion which includes a contact portion capable of coming into contact with a driven body and a piezoelectric material, and a drive circuit which drives the piezoelectric drive portion. The drive circuit sets an allowable maximum output torque Tlim or less to an allowable output torque range, sets output torque Td of the piezoelectric drive portion so as to be within the allowable output torque range, and operates the piezoelectric drive portion. The allowable maximum output torque Tlim is expressed by the following Expression (1).

description='In-line Formulae' end='lead'Tlim=r1×μk×Ns×fs  (1)description='In-line Formulae' end='tail'

In the expression, r1 is a distance between a rotation center of the driven body and a contact position of the contact portion, μk is a dynamic friction coefficient between the driven body and the contact portion, Ns is a pressing force by which the contact portion presses the driven body when an operation of the piezoelectric drive portion stops, and fs is a coefficient of 1 or less.

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Patent Owner(s)

Patent OwnerAddress
SEIKO EPSON CORPORATION4-1 NISHI-SHINJUKU 2-CHOME SHINJUKU-KU TOKYO

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Miyazawa, Osamu Shimosuwa, JP 85 1072

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