Polyhedron piezoelectric column or piezoelectric tube ultrasonic micromotor

A polyhedron, piezoelectric tube technology, applied in the direction of piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, electrical components, etc., can solve difficult miniaturization, high bending stiffness, polarization process and welding process difficulties, to achieve the effect of promoting miniaturization, easy operation and broad application prospects

Inactive Publication Date: 2006-02-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned ultrasonic motors excited by piezoelectric sheets have been industrialized, but it is difficult to miniaturize
Although the piezoelectric cylindrical micromotor can be made very thin, due to the arc-shaped electrode surface, the polarization process and welding process are difficult
The existing piezoelectric square-pillar ultrasonic micromotor uses a flat electrode surface for arc-shaped surface problems, but the bending stiffness is relatively high under the same size

Method used

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  • Polyhedron piezoelectric column or piezoelectric tube ultrasonic micromotor
  • Polyhedron piezoelectric column or piezoelectric tube ultrasonic micromotor
  • Polyhedron piezoelectric column or piezoelectric tube ultrasonic micromotor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 is an oscillating ultrasonic micromotor with a single-end drive rotor with a magnetic positioning structure

[0033] The main feature of this structure is that the rotor is made of magnetic steel balls or steel rings 91, the polyhedral piezoelectric column or piezoelectric tube 93 and the concave or tapered magnetic metal matching block 92 are bonded together with superglue to form a motor stator. . The magnetic steel ball or steel ring 91 is placed on the concave or tapered surface of the metal matching block. In this way, the magnetic force between the rotor and the metal matching block 92 is used as the preload required for fixing the rotor and generating friction, and the torque is directly output by the rotor, such as Figure 9 shown. A non-magnetic spacer can be used between the magnetic rotor and the magnetic matching block to adjust the size of the suction force.

Embodiment 2

[0034] Embodiment 2 is an oscillating ultrasonic micromotor with a single-end drive rotor with a torque shaft output structure

[0035]The main feature of this structure is: the shaft 101 is connected with a convex plate with a diameter slightly larger than the shaft, which is used as the bottom rotor and withstands the small spring 102 sleeved on the shaft, and it is integral with the shaft. In addition to the shaft hole in the middle of the stator matching block 104, there is also a tapered circular hole on the upper and lower surfaces. After passing the shaft 101 from bottom to top through the matching block, glue the matching block 104 and the polyhedral piezoelectric column or piezoelectric tube 105 at 107, so that the matching block 104 and the polyhedral piezoelectric column or piezoelectric tube 105 together form a motor the stator. The rotor 103 is placed on the stator matching block 104 and engaged with the shaft 101 through a key. The preload is provided by a smal...

Embodiment 3

[0036] Embodiment 3 is an oscillating head ultrasonic micromotor with a single-end drive rotor with a fixed shaft structure

[0037] The main feature of this structure is that a thin rod is processed in the middle of the stator matching block 113 as the fixed shaft 1130 of the motor. The shaft is the same metal piece as the stator mating block. The polyhedral piezoelectric column or piezoelectric tube 114 is glued to the matching block at 116 to serve as the stator of the motor together. The rotor 112 is sleeved on the fixed shaft 1130 of the stator matching block 113, and the fixed shaft 1130 is connected with a convex plate with a diameter slightly larger than the shaft, which is used to withstand the small spring 111 sleeved on the shaft, and the small spring 111 provides preload. In this motor, the main function of the shaft 1130 is to locate the rotor 112 and the small pressure spring 111 . The torque is directly output by the rotor. In actual use, the outer edge of the...

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PUM

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Abstract

The invention relates to a flexural vibration modality ultrasonic micro-motor based on the polyhedral piezoelectric pole or piezoelectric pipe, belonging to the field of ultrasonic application. The invention comprises a stator vibrated by actuating ultrasonic, a rotor for putting torque or an axis connecting rotor, and a pre-pressure unit for pressing rotor. Wherein, said stator is mainly formed by a piezoelectric ceramic component for actuating vibration and its matching blocks, which is characterized in that: said piezoelectric ceramic component for actuating flexural vibration is polyhedral piezoelectric pole or piezoelectric pipe, whose surfaces of external wall are plated with a plurality of external electrodes for polarization and actuating vibration. The inventive motor has a wide size to be processed, which improves the minimization of ultrasonic motor. And, when inputting the electrical signal, the rotator can rotate on the surface of stator. Said invention has wider application in the fields of biology, medical treatment, micro-mechanism, precision electronic mechanism and the national defence.

Description

technical field [0001] The invention belongs to the field of ultrasonic application technology, in particular to a miniaturized ultrasonic micro-motor structure design. Background technique [0002] Piezoelectric ultrasonic micromotor is a driving mechanism made of a specific structure by 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 micromotors have the advantages of low speed, high torque, and can directly drive loads without a reduction mechanism. [0003] Bending vibration mode ultrasonic micromotor is a kind of ultrasonic micromotor. Its structure is relatively simple compared with other ultrasonic micromotors. It also mainly con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/00
Inventor 周铁英陈宇鹿存跃
Owner TSINGHUA UNIV
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