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Rotating type traveling wave ultrasonic motor and stator and rotor pre-tightening method thereof

An ultrasonic motor, rotary type technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc., to achieve the effect of reliable preload, light weight and simple structure

Inactive Publication Date: 2015-12-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the adjustment of the pre-tightening force of the existing ultrasonic motor, the present invention proposes a rotary traveling wave ultrasonic motor and its stator and rotor pre-tightening method

Method used

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  • Rotating type traveling wave ultrasonic motor and stator and rotor pre-tightening method thereof
  • Rotating type traveling wave ultrasonic motor and stator and rotor pre-tightening method thereof
  • Rotating type traveling wave ultrasonic motor and stator and rotor pre-tightening method thereof

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specific Embodiment approach 1

[0013] Specific implementation mode 1. Combination figure 2 Describe this specific embodiment. A rotary traveling wave ultrasonic motor described in this specific embodiment includes a rotating shaft 1, a rotor 4, a stator 6, a piezoelectric ceramic 7, a base 8 and a housing 3, and the housing 3 is fixed to the base 8. The stator 6 is installed on the base 8, the piezoelectric ceramic 7 is pasted on the lower surface of the stator 6, the lead wire of the piezoelectric ceramic 7 is drawn out through the gap between the base 8 and the shell 3, the rotor 4 is installed on the shaft 1, and the rotor 4 The end surface is pasted with friction material 5 and is in contact with the surface of the stator 6. The top of the rotating shaft 1 is installed on the end cover of the housing 3 through the upper bearing 2, and the lower end of the rotating shaft 1 is fixed on the base 8 through the lower bearing 9, which also includes a preload pad Sheet 10 and circlip 11, the lower end of the ...

specific Embodiment approach 2

[0015] Specific embodiment two, combine image 3 Describe this specific embodiment. A rotary traveling wave ultrasonic motor described in this specific embodiment includes a rotating shaft 1, a rotor 4, a stator 6, a piezoelectric ceramic 7, a base 8 and a housing 3, and the housing 3 is fixed to the base 8. The stator 6 is installed on the base 8, the piezoelectric ceramic 7 is pasted on the lower surface of the stator 6, the lead wire of the piezoelectric ceramic 7 is drawn out through the gap between the base 8 and the shell 3, the rotor 4 is installed on the shaft 1, and the rotor 4 The end surface is pasted with friction material 5 and is in contact with the surface of the stator 6. The top of the rotating shaft 1 is connected to the rotor 4 through a spherical shoulder, and is installed on the end cover of the casing 3 through the upper bearing 2. The lower end of the rotating shaft 1 is fixed on the base through the lower bearing 9. 8, it also includes a pre-tightening ...

specific Embodiment approach 3

[0017] Embodiment 3. The difference between this embodiment and the rotary traveling wave ultrasonic motor described in Embodiment 1 is that the stator 6 and the rotor 4 are in contact with a tapered surface.

[0018] In this embodiment, the contact between the stator 6 and the rotor 4 adopts tapered surface contact, and the radial contact size between the two should be very small, so as to reduce noise and improve energy conversion efficiency. Since the present invention utilizes the circlip 11 and the preload gasket 10 to exert positive pressure on the rotor 4 and the stator 6 through the lower bearing 9, instead of the publication number 201742324U, the publication date is February 09, 2011, and the patent name is " In the "rotary traveling wave ultrasonic motor", the shell and the base are connected by bolts, and the preload is applied to the rotor through the upper bearing to provide the positive pressure required for transmission between the stator and the rotor. Therefo...

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Abstract

The invention provides a rotating type traveling wave ultrasonic motor and a stator and rotor pre-tightening method thereof, and relates to the field of piezoelectric ultrasonic motors. The problems existing in pre-tightening force adjustment of an existing ultrasonic motor are solved. According to the rotating type traveling wave ultrasonic motor and the stator and rotor pre-tightening method thereof, a section of annular groove is machined in a rotating shaft, the depth and the width of a cutting groove are obtained through calculation according to given requirements, an elastic collar is installed to close a pre-tightening gasket, the interior of the structure is stressed to form a closed system, the elastic collar exerts force to the inner side of a lower bearing and acts on a rotor through a base and the rotating shaft, therefore, the positive pressure between a stator and the rotor is increased along with increasing of the thickness and the quantity of the pre-tightening gaskets, obtained pre-tightening force is larger, and the size of the pre-tightening force can be controlled and determined through elastic mechanics calculation and repeated trials. By means of the ultrasonic motor, limitation of the pre-tightening force of an original ultrasonic motor on a shell and the base is eliminated, further structural and material optimization can be conducted on the shell and the base, and light weight is achieved.

Description

technical field [0001] The invention relates to the field of piezoelectric ultrasonic motors. Background technique [0002] Ultrasonic motor is a kind of inverse piezoelectric effect of piezoelectric ceramics, which generates vibration in the ultrasonic frequency band in the elastic body, forms a particle motion with a specific trajectory on the surface of the elastic body, and moves the particle through the friction coupling between the stator and the mover. A micro-motor that converts the microscopic motion of the rotor into the macroscopic motion of the rotor. Compared with traditional motors, rotary ultrasonic motors have the advantages of low speed, high torque, fast response, no electromagnetic interference, and self-locking when power is off. However, with the continuous development of aerospace technology, some advantages of ultrasonic motors compared with traditional motors need to be continuously improved. Therefore, it is of great significance to develop a rotar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02N2/16
Inventor 曲建俊陶小鹤罗云霞刘德赟
Owner HARBIN INST OF TECH
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