A piezoelectric micromotor with a stator of <i>φ</i>=1.6 mm and <i>l</i>=4 mm using bulk PZT
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Date
2004
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
inst Pure Applied Physics
Abstract
The smallest discrete piezoelectric ultrasonic motor using bulk ceramics was developed. We are proposing basically a two-part motor: stator and rotor. The stator of the present motor consists of a hollow metal brass tube with outer diameter of 1.6 mm, inner diameter of 0.8 mm and length of only 4 mm with 2 PZT plates bonded onto it. Owing to the asymmetrical stator surface, two degenerated orthogonal bending modes were slightly split, resulting in a wobbling motion. Thus, the motor can be driven by a single driving source. The rotor is a spring, which is basically different from previous designs, pressed at both ends to the stator by a pair of ferrules. Consequently, the length of the whole motor assembly was reduced significantly; a final motor length cf only 5 mm was obtained. The working frequency under zero load was approximately 227-233 kHz. Although the size is small, relatively high power was obtained under an optimized load condition: torque of 0.06mNm, maximum power of 3.2 mW with a speed of 118 rad/s, and maximum efficiency of 11% under 48 Vrms at 221 kHz.
Description
Uchino, Kenji/0000-0003-1651-7912
Keywords
ultrasonic motor, PZT, self-oscillating circuit, elliptical displacement, micromechanical systems
Turkish CoHE Thesis Center URL
Citation
30
WoS Q
Q4
Scopus Q
Source
Volume
43
Issue
4A
Start Page
1429
End Page
1433