A screw thread driving polyhedral supersonic micro motor with pre-pressure mechanism

A pre-pressure mechanism and micro-motor technology, applied in the direction of generator/motor, piezoelectric device/electrostrictive device, piezoelectric effect/electrostrictive or magnetostrictive motor, etc., can solve the problem of unstable operation and impact There will be problems such as running accuracy and return clearance, so as to achieve the effect of stable performance and simple structure

Inactive Publication Date: 2007-05-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This structure does not have an additional mechanism for applying preload. Although its structure is simple, its operation is not stable enough, and return clearance will be generated, which will affect the operation accuracy.

Method used

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  • A screw thread driving polyhedral supersonic micro motor with pre-pressure mechanism
  • A screw thread driving polyhedral supersonic micro motor with pre-pressure mechanism
  • A screw thread driving polyhedral supersonic micro motor with pre-pressure mechanism

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: Thread-driven polyhedron ultrasonic micromotor with pretension (tension) force spring

[0035] The thread-driven polyhedron ultrasonic micromotor structure with pretension (tension) force spring of this embodiment, as shown in FIG. The ultrasonic motor includes a rotor 41 and a stator 43, and 12 piezoelectric elements 42 are attached to the stator 43 (the piezoelectric elements 42 can be sheet-shaped, arc-shaped sheet, column-shaped or various polyhedrons, integral annular or conical piezoelectric elements). The stator and rotor have threads that cooperate with each other. The cross-section of the thread can be in various forms such as triangle, trapezoid, rectangle, and convex surface, and their combinations. The form of the thread can be continuous, segmented, or a curve with a specific trajectory.

[0036] One end of the stator is provided with a thin-wall isolation strip 45, and one end of the isolation strip is fixed on the base 44, and the function o...

Embodiment 2

[0039] Embodiment 2: Thread-driven polyhedron ultrasonic micromotor with rotor cap and pretension (tension) force spring

[0040] As shown in Figure 5, the main difference between this embodiment and Embodiment 1 is: in this embodiment, the pretension (tension) force spring 512 is placed on the outside of the stator 53, and one of the two supporting ends of the spring 512 is on the rotor. On the cap 511 , one is on the bearing 54 , the bearing 54 can be arranged on the base 59 , and can also be arranged on the stator 53 to reduce the frictional force when the rotor 511 rotates. The form of the spring can also be an elastic sheet, and the form of the bearing can also be a groove or a slide sheet containing balls. 57 is a wear-resistant coating.

[0041] Another structure of the pre-pressure mechanism in this embodiment is: two magnetic rings can be used instead at the section between the stator 53 and the rotor 511; or one is a magnetic ring and the other is a ferromagnetic ri...

Embodiment 3

[0042]Embodiment 3: Double-stator thread-driven polyhedron ultrasonic micromotor with pretension (tension) force spring

[0043] The double-stator thread-driven polyhedral ultrasonic micromotor with pretension (tension) force spring used in this embodiment is shown in FIG. 6 . The stators 62 and 66 drive the rotor 610 to move at the same time, and one end of the stator 66 is fixed on the base 69 by an isolation belt 68, and a spring 63 is used between the two stators to provide a pretension (tension) force, so that the threads between the stator and the rotor are mutually Press tight. Blocking blocks 61 and 67 are pasted on the stators 62, 66, and block the two ends of the spring. The blocking material can be metal or non-metal. The two stators are positioned through the slot 613 so that the stator 62 does not rotate.

[0044] When this embodiment is applied, the optical lens group can be installed in the rotor cavity 611 and / or the stator cavity 612 . After the alternatin...

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Abstract

The related thread-drive polyhedral ultrasonic micromotor with precompression mechanism comprises: a single stator or double stator or multiple stators, a rotor with thread matched with stator, and a piezoelectric element joined with stator or rotor. This invention has superiority on size and cost and efficiency, and has wide application in optical device and linear positioning system.

Description

technical field [0001] The invention belongs to the field of ultrasonic application technology, in particular to a structural design of a thread-driven polyhedron ultrasonic micro-motor with a pre-pressure mechanism. 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] Ultrasonic motors excited by piezoelectric sheets have been industrialized, but it is difficult to miniaturize them. Although the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/10H02N2/12H01L41/08
Inventor 周铁英鹿存跃陈宇傅德永李毅王正平
Owner TSINGHUA UNIV
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