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Ultrasonic motor with high rotation precision structure and stator and rotor preloading method

A technology of rotation precision and ultrasonic motor, which is applied in the manufacture of stator/rotor body, piezoelectric effect/electrostrictive or magnetostrictive motor, generator/motor, etc. Coaxiality is difficult to meet high coaxial requirements, etc., to achieve the effect of improved rotation accuracy, high rotation accuracy, and improved assembly accuracy

Active Publication Date: 2017-11-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve the problem that the bearing seat holes of the supporting bearings of the existing ultrasonic motor are respectively processed on the upper cover and the base of the motor. The rotor shaft is supported by deep groove ball bearings, and the rotation accuracy of the rotor shaft is low. In order to provide an ultrasonic motor with a high rotation accuracy structure and a method for preloading the stator and the rotor

Method used

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  • Ultrasonic motor with high rotation precision structure and stator and rotor preloading method
  • Ultrasonic motor with high rotation precision structure and stator and rotor preloading method
  • Ultrasonic motor with high rotation precision structure and stator and rotor preloading method

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specific Embodiment approach 1

[0012] Specific implementation mode one: combine Figure 1-Figure 3 Explain that an ultrasonic motor with a high rotation precision structure in this embodiment includes an upper cover 10, a base 5, a rotor shaft 1, a stator 6, a rotor 8, a rotor flange 20, rotor screws 17 and two angular contact ball bearings 4;

[0013] The upper cover 10 and the base 5 are respectively processed with coaxial through holes with the same inner diameter, and an angular contact ball bearing 4 is installed in each of the two coaxial through holes, and the angular contact lines of the two angular contact ball bearings 4 are in the same direction and parallel Arrangement, the rotor shaft 1 is installed on two angular contact ball bearings 4, the stator 6 is installed on the base 5, the rotor 8 and the stator 6 are arranged between the two angular contact ball bearings 4, the rotor flange 20 is arranged on the angular contact ball Between the bearing 4 and the rotor 8, the rotor flange 20 is firml...

specific Embodiment approach 2

[0015] Specific implementation mode two: combination figure 1 and figure 2 Explain that an ultrasonic motor with a high rotation precision structure in this embodiment also includes a preload nut 2 and a washer 3; a preload nut 2 is screwed on the rotor shaft 1 adjacent to the base 5, and the preload nut 2 is in contact with the corner Washers 3 are arranged between the ball bearings 4 . With such a design, the high rotation accuracy and precise preload of the ultrasonic motor can be realized, which meets the design requirements and actual needs. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0016] Specific implementation mode three: combination figure 1 and figure 2 Explain that an ultrasonic motor with a high rotation precision structure in this embodiment also includes a pressure ring 11, a gasket 15, a bearing preload adjustment ring 16 and a pressure ring screw 19; the pressure ring 11 is installed on the upper cover 10 through the pressure ring screw 19 Above, between the pressure ring 11 and the angular contact ball bearing 4 there is a bearing preload adjusting ring 16 which is in contact with the outer ring of the angular contact ball bearing 4, and between the rotor flange 20 and the angular contact ball bearing 4 there is a contact The inner ring of the ball bearing 4 contacts the gasket 15 . With such a design, the high rotation accuracy and precise preload of the ultrasonic motor can be realized, which meets the design requirements and actual needs. Others are the same as in the first or second embodiment.

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Abstract

The invention provides an ultrasonic motor with a high rotation accuracy structure and a stator and rotor pre-tightening method, relates to the ultrasonic motor and the stator and rotor pre-tightening method of the motor, and aims at solving the problems that the coaxiality of two bearing block holes cannot easily reach relatively high coaxiality requirements since the bearing block holes of support bearings of an existing ultrasonic motor are arranged in an upper cover and a base of the motor respectively and are individually machined, and the rotation accuracy of a rotor shaft is low since deep groove ball bearings are adopted by supports of a motor rotor shaft. The ultrasonic motor comprises the upper cover, the base, the rotor shaft, a stator, a rotor, a rotor flange, a rotor bolt and two angular contact ball bearings; angular contact lines of the two angular contact ball bearings are in the same direction and are arranged in parallel; the rotor shaft is arranged on the two angular contact ball bearings; the stator is arranged on the base; the rotor flange is fixedly connected with the rotor shaft; and a circular piezoelectric ceramic layer is paved on the end surface, adjacent to the base, of the stator. The ultrasonic motor is especially suitable for the application scene with high rotation accuracy as the ultrasonic motor.

Description

technical field [0001] The invention relates to an ultrasonic motor and a pre-tightening method for a stator and a rotor of the motor, belonging to the field of piezoelectric ultrasonic motors. Background technique [0002] Ultrasonic motor is a new type of motor that uses the inverse piezoelectric effect of piezoelectric ceramics to generate traveling waves inside the stator, generate elliptical ultrasonic vibrations on the surface of the stator, and generate friction through the contact between the stator and the rotor to drive the rotor to move. Compared with traditional motors, ultrasonic motors have the advantages of low speed, high torque, fast response, high precision, flexible structure, and no magnetic field interference for capacitive loads, and are suitable for special applications such as vacuum and low temperature. In most applications, the ultrasonic motor is required to have the characteristics of fast response and high rotation accuracy, but the existing stru...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/12H02K15/02
CPCH02K15/02H02N2/12
Inventor 曲华杰温众普曲建俊宋宝玉
Owner HARBIN INST OF TECH
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