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Toothless traveling wave rotary ultrasonic motor and working mode and electric exciting manner

An ultrasonic motor, working mode technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc., can solve the continuous contact damage and bending vibration of traveling wave ultrasonic motor Increase the frequency, increase the machining cost and other problems, to achieve the effect of low machining cost, stable performance and simple structure

Inactive Publication Date: 2010-08-04
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

This deformation increases with the distance from the surface away from the neutral layer, because too thick a plate will cause the frequency of bending vibration to increase and the amplitude to decrease
Usually, the circular plate or annular plate is provided with evenly distributed teeth to meet the certain circumferential displacement of the surface particles while not reducing the bending vibration amplitude as much as possible. Of course, this makes the continuous contact advantage of the traveling wave ultrasonic motor damaged to some extent
At the same time, setting teeth on a circular or annular plate also increases the cost of machining

Method used

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  • Toothless traveling wave rotary ultrasonic motor and working mode and electric exciting manner
  • Toothless traveling wave rotary ultrasonic motor and working mode and electric exciting manner
  • Toothless traveling wave rotary ultrasonic motor and working mode and electric exciting manner

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Embodiment Construction

[0018] A toothless traveling wave rotating ultrasonic motor that uses the in-plane vibration of the circular stator and the resulting Poisson effect to make the particles on the end surface of the stator undergo elliptical motion and push the rotor pressed against it through friction to rotate. figure 1 shown. Its characteristics: the stator is composed of two ring-shaped stators 2 and 4 clamping two pieces of 8-section piezoelectric ceramics 3, and there is an electrode piece 6 in the middle of the two pieces of piezoelectric ceramics; the rotor is composed of rotor I and rotor II, of which rotor I The connecting mechanism on the rotor passes through the inner cavity of the annular stator, and its working surface is pressed against one end surface of the stator. The rotor II is connected with the connecting mechanism of the rotor I through threads, and its working surface is pressed against the other end surface of the stator. The webs connecting the working faces on the roto...

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Abstract

The motor includes stator, rotor, and piezoelectric ceramics. The stator is in sandwich structure: two circle stators hold piezoelectric ceramic ring. Two rotors are pressed on two end faces of stator. Piezoelectric ceramics are in use for exciting mode of vibration inside faces of stator. At the same time, Poissons effect makes particles on two end faces of stator generate axial displacement. Using two sinusoidal signals with pi / 2 phase difference excites modes of vibration in isomorphic faces of stator with pi / 2 difference in space synchronously. Thus, traveling waves are produced on twoend faces of stator synchronously. Moreover, particles on surface generate elliptic motions. The said elliptic motions through friction drive rotation of rotor pressed on the stator. Features are: simple structure, high driving efficiency, large moment, reliable operation, and low fabrication cost.

Description

1. Technical field: [0001] The toothless traveling wave rotating ultrasonic motor, working mode and electric excitation method of the present invention belong to the field of ultrasonic motors. 2. Background technology: [0002] Ultrasonic motor is a new type of power output device that utilizes the inverse piezoelectric effect of piezoelectric ceramics and ultrasonic vibration. Among them, the toothless traveling wave rotating ultrasonic motor belongs to a kind of ultrasonic motor. At present, rotating ultrasonic motors can be divided into standing wave type and traveling wave type: standing wave type is mainly characterized by single-phase power excitation and intermittent contact between stator and rotor; traveling wave type is characterized by 2-phase power excitation and continuous contact between stator and rotor as the main feature. In comparison, the traveling wave torque has a greater potential and a relatively stable performance. However, most of the existing tr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/16H02N2/14
Inventor 赵淳生金家楣
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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