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Multi-rotor cylindrical high-torque ultrasonic motor

An ultrasonic motor, cylindrical technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc., can solve serious loss, difficult engineering, low vibration efficiency and other problems, to achieve the effect of improving output torque, broad application prospects, and increasing energy density

Inactive Publication Date: 2011-05-11
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the working frequency, rotational speed, and amplitude of the two stators are inconsistent, the loss is serious, the vibration efficiency is low, and the modal interference is serious, which is difficult to realize in engineering.
The method of multiple motors in series also has the above-mentioned problems that cannot be overcome. The different stators have to be excited separately, and the excitation of the stators becomes difficult, and it is difficult to ensure synchronization. Therefore, the output torque is not linearly superimposed, but unstable, even more than a single motor. smaller

Method used

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  • Multi-rotor cylindrical high-torque ultrasonic motor
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  • Multi-rotor cylindrical high-torque ultrasonic motor

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Experimental program
Comparison scheme
Effect test

Embodiment 2

[0058] Such as Figure 7 As shown, in this embodiment: the multi-rotor ultrasonic motor with stepped stator inner surface contact includes 71 piezoelectric ceramic elements, 72 grooved stators, 73 rotors, 74 leaf springs, 75 compression springs, and 76 rotating shafts. There are grooves on the outer surface of the polygonal column of the cylindrical stator, and the piezoelectric ceramic elements are pasted in segments. The plane in the groove may or may not be bonded with piezoelectric ceramic elements. Although there are grooves on the outer surface of the polygonal column of the cylindrical stator, the piezoelectric ceramic elements are pasted in sections, but the ceramics pasted in sections are still considered as a group. Eight groups of piezoelectric ceramic sheets are pasted on the outer prism surface of the stator.

[0059] The stator adopts Figure 5 The in-plane vibration modes are shown as the operating modes. The bonding and modal excitation method of the piezoe...

Embodiment 3

[0061] Such as Figure 8 As shown, in this embodiment: the outer wall of the stator 84 is circular, the inner wall of the stator 84 is polygonal, and the rotor 82 is arranged outside the stator 84 .

[0062] The positioning mechanism 4 is a positioning cover, and the positioning mechanism 4 is located at both ends of the stator 2 for supporting and fixing the stator.

[0063] The rotor 82 is a ring-shaped structure, and its structure is described in Figure 10 , wherein: the rotor 101 of the circular ring structure is an open ring, and the two ends 102 of the open ring are provided with tension springs 103 to realize that the rotor 101 is clamped on the stator 84 .

[0064] The piezoelectric ceramic element 85 is a strip-shaped plate structure, and the piezoelectric ceramic element 85 is arranged on the inner wall of the stator 2 in the axial direction of the stator 84 .

[0065] The pasting of the piezoelectric ceramics and the excitation mode of the mode are the same as in...

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Abstract

The invention discloses a multi-rotor cylindrical high-torque ultrasonic motor in the technical field of ultrasonic application. The motor comprises a piezoelectric ceramic element, a stator, rotors and a positioning mechanism, wherein one or more rotors are sequentially and vertically arranged on the positioning mechanism and are contacted with the stator; the positioning mechanism, the rotors and the stator are coaxially arranged; and the piezoelectric ceramic element is arranged outside the stator and the rotors are arranged in the stator or the piezoelectric ceramic element is arranged inthe stator and the rotors are arranged outside the stator. By taking the advantage that the thin and long cylindrical stator can stick a plurality of piezoelectric ceramics, the motor increases the energy density of vibration of the stator and improves the output torque of the stator; due to the characteristic that the angular speed of the propagation of the in-plane travelling wave on the statoris consistent, the stator drives the plurality of rotors to synchronously rotate to obtain a uniform output speed which contributes to the stable work of the motor; and the thin and long structure can be also applied in a narrow and long space.

Description

technical field [0001] The invention relates to a device in the field of ultrasonic application technology, in particular to a multi-rotor cylindrical high-torque ultrasonic motor vibrating in-plane. Background technique [0002] Ultrasonic motors use the inverse piezoelectric effect of piezoelectric materials to convert electrical energy into vibration energy of the stator of the ultrasonic motor, and then convert the vibration energy into rotation or linear motion of moving parts through friction. It is generally mainly composed of a stator, a rotor (mover) and a pre-pressure mechanism. Compared with traditional electromagnetic motors, ultrasonic motors have many features and advantages, such as: [0003] 1. Compact structure, high energy density (torque / mass), easy to miniaturize. [0004] 2. Low speed and high torque, without gear reduction mechanism, can realize direct drive. [0005] 3. The motor responds quickly and can realize self-locking when power off. [0006...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/16H02N2/12
Inventor 鹿存跃黎金良张金城
Owner SHANGHAI JIAO TONG UNIV