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Flat dual-stator thread driving ultrasonic minimized motor having thread pair pretensioning

A threaded pair, double stator technology, applied in piezoelectric effect/electrostrictive or magnetostrictive motors, generators/motors, electrical components, etc., can solve the problems of unstable motor performance and large torque fluctuations. The effect of eliminating backlash, improving motor accuracy, and broad application prospects

Inactive Publication Date: 2009-02-11
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] These driving schemes have disadvantages. These schemes do not apply preload between the stator and the rotor. The stator and the rotor only rely on machining accuracy to ensure meshing. There are problems such as backlash and large torque fluctuations, which make the performance of the motor very unstable.

Method used

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  • Flat dual-stator thread driving ultrasonic minimized motor having thread pair pretensioning
  • Flat dual-stator thread driving ultrasonic minimized motor having thread pair pretensioning
  • Flat dual-stator thread driving ultrasonic minimized motor having thread pair pretensioning

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1: Using two piezoelectric elements to construct a flattened traveling-wave thread-driven ultrasonic micromotor with thread pair preload

[0028] image 3The structure of the invented flattened traveling-wave thread-driven ultrasonic micromotor with pre-tightening using two piezoelectric elements to construct the stator and its implementation in the lens focusing system are given. Wherein, the structures of the stators 34 and 35 are exactly the same, and they are arranged side by side up and down. The inner cylindrical surfaces of the stators 34, 35 and the outer cylindrical surfaces of the rotor 33 are provided with mutually matched screw pairs 37, and the two stators 34, 35 drive the rotor 33 to rotate at the same time, and the rotary motion of the rotor 33 is converted into Axial linear motion. Metal electrodes 36 and 38 are pasted on the surface of the piezoelectric element 31 for introducing excitation signals. The stators 34 and 35 of the motor each ...

Embodiment 2

[0034] Embodiment 2: Using a single piezoelectric element to construct a flattened traveling-wave thread-driven ultrasonic micromotor with a preloaded stator

[0035] The difference between the second embodiment and the first embodiment is that a single piezoelectric element sheet is used to construct the stator in the second embodiment, while two piezoelectric element sheets are used to construct the stator in the first embodiment, and the rest is similar to the first embodiment.

[0036] Figure 6 A configuration of the electrode stator in this embodiment is given. A piezoelectric element 61 is pasted on the upper surface of the metal cylinder 62 to form a stator. The outer surface of the piezoelectric element on the motor stator is pasted with thin metal electrodes 64 for introducing excitation signals, and the other surface of the stator metal body is pasted with elastic metal electrodes 63 for the fixed support of the motor. The inner wall of the stator is provided with...

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PUM

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Abstract

The invention discloses a flattened double-stator thread-driven ultrasonic micromotor with pretightened screw thread pair. The flattened double-stator thread-driven ultrasonic micromotor comprises a rotor and two stators arranged in parallel, wherein the stator is formed by combining a hollow metal cylinder or a metal polyhedral column with an inner thread with a piezoelectric element and an elastic metal electrode; the rotor has an outer thread matched with the inner thread of the stator on the outer circumference wall; and the rotor is engaged with the two stators through the threads. The flattened double-stator thread-driven ultrasonic micromotor with pretightened screw thread pair adopts a flattened screw thread drive structure pretightened by the two stators, so that the motor can be processed to have a smaller height size. Meanwhile, a pretightening force can be applied between the screw thread pair to eliminate backlash, thereby improving the motor accuracy, the force / moment property, the reliability and the stability, and suiting miniaturization. The flattened double-stator thread-driven ultrasonic micromotor has wide application prospect in the aspects such as mobile phone lens module, medical treatment, MEMS and national defense science and technology.

Description

technical field [0001] The invention belongs to the field of ultrasonic applications, in particular, it relates to a miniaturized ultrasonic micromotor using double stators to preload a rotor. Background technique [0002] The ultrasonic motor is a driving mechanism made of a specific structure using the inverse piezoelectric effect of piezoelectric materials. It is generally composed of piezoelectric element sheets, stators, rotors, pre-pressure mechanisms, transmission mechanisms and other functional components. It uses the inverse piezoelectric effect of piezoelectric elements to generate ultrasonic vibrations on the surface of the stator, and drives the rotor to move by the friction between the stator and the rotor. [0003] The camera lens for mobile phones has developed rapidly in recent years, and mobile phones have gradually become the main camera tool for people in recent years. This objectively requires that the volume of the optical zoom lens be smaller and small...

Claims

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Application Information

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IPC IPC(8): H02N2/12
Inventor 鹿存跃周铁英张斌
Owner ZHEJIANG UNIV