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Curve swing head supersonic mciro motor composed of multiple piezoelectric lamination pile transducer

A technology of transducer and piezoelectric sheet is applied in the field of ultrasonic motor structure design, which can solve the problem that the resonance frequency of the two signals of the motor is not degenerate, the upper and lower positions of the two layers of piezoelectric sheets are greatly different, and the thickness of the piezoelectric sheet cannot be too thin. and other problems, to achieve the effects of excellent operating performance, degeneracy of resonance frequency, and promotion of miniaturization and industrialization

Inactive Publication Date: 2008-03-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, limited by the conventional processing technology, the thickness of the piezoelectric sheet used in the motor should not be too thin (generally not less than 0.2mm). Because only one set of transducers is used, the upper and lower positions of the two piezoelectric sheets differ greatly, so the resonance frequency of the two signals of the motor is not degenerate, and the movement is not easy to stabilize, which limits the use of this motor

Method used

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  • Curve swing head supersonic mciro motor composed of multiple piezoelectric lamination pile transducer
  • Curve swing head supersonic mciro motor composed of multiple piezoelectric lamination pile transducer
  • Curve swing head supersonic mciro motor composed of multiple piezoelectric lamination pile transducer

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Embodiment 1

[0036] The present invention has designed the first embodiment of the piezoelectric ultrasonic motor. In this embodiment, in addition to using multiple groups of piezoelectric lamination stack transducers as piezoelectric elements, other structures adopt the patented ultrasonic motor of the applicant. With a similar structure, as shown in FIG. 11 , the motor is composed of a rotor 111 , a stator 112 and a central shaft 113 . Wherein, the stator 112 is composed of an upper matching block 1121 , a stack of multilayer piezoelectric ceramic laminations 1122 , electrode lead-out sheets 1123 , and a lower matching block 1124 . The rotor 111 is composed of a preload nut 1111 , a fixed bracket 1112 , a gear 1113 , a transition piece A1114 , a transition piece B1115 , a motor rotor 1116 and a preload spring 1117 .

[0037] The inner hole of the upper matching block 1121 is a threaded hole 11211, and it is connected with the screw part 1131 of the central shaft 113, and the screwing bet...

Embodiment 2

[0052] The overall structure of the motor in this embodiment is an improvement on the structure of the first embodiment. As shown in FIG. 12 , the motor consists of a rotor 121 , a stator 122 and a central shaft 123 . Among them, the stator 122 is composed of an upper matching block 1222, a friction material 1221 bonded to the upper end surface of the upper matching block 1222, a multilayer piezoelectric ceramic lamination stack 1223, an electrode lead-out piece 1224, a lower matching block 1225, and a clip with internal threads. Tight nut 1226 is formed. The rotor 121 is made up of a preload nut 1211 , a fixed bracket 1212 , a gear 1213 , a preload spring 1214 and a motor rotor 1215 .

[0053]The friction material 1221 and the upper matching block 1222 are connected together by epoxy resin glue, the inner hole of the upper matching block 1222 is a light hole, and a transition fit is maintained with the central shaft 123, which is realized by the end face of the flange 1232 on...

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Abstract

This invention relates to a bending rocking ultrasonic micro-electric motor made of multiple group of piezoelectric sheets pile. It comprises: a central axle, a stator and a rotor slipped-over therewith, and a torque output part. The stator is composed of: an upper matching block, a converter, an electrode leading-out piece and a lower matching blocks. The converter is n pieces piezoelectric sheets (n>14), on the two surfaces of the sheet is divided into m electrodes (m>32) with different polarizing direction. All the sheets are put together to form a pile. Internal connection or external connection is used for connection between each layer electrodes. The simple signal excioted ones are parallel connected, then leading-out electrode; on the other hand, the coswt signal excites ones are also parallel connected then leading-out electrode. Advantages are: minimized, useful in biological, medical, micro-mechancial, national defance sciences fields.

Description

technical field [0001] The invention belongs to the field of ultrasonic applications, in particular to the structural design of miniaturized ultrasonic motors. Background technique [0002] The piezoelectric ultrasonic motor is a driving mechanism made of a specific structure using the inverse piezoelectric effect of piezoelectric materials. It is generally composed of functional components such as a stator, a rotor, and a pre-pressure mechanism. It uses the inverse piezoelectric effect of piezoelectric ceramics to generate ultrasonic vibrations on the surface of the stator, and the friction between the stator and the rotor drives the rotor to move. Ultrasonic motors have the following advantages over ordinary electromagnetic motors: [0003] 1. With low speed and high torque, it can directly drive the load without deceleration mechanism. [0004] 2. Small size, flexible structure, power volume ratio is 3-12 times that of electromagnetic motor. [0005] 3. Quick start and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/12
Inventor 周铁英褚祥诚陈宇张力李龙土
Owner TSINGHUA UNIV
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