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Surface texture of an ultrasonic motor rotor and its preparation method

An ultrasonic motor and rotor surface technology, applied in the direction of generator/motor, piezoelectric effect/electrostrictive or magnetostrictive motor, electrical components, etc., can solve the problem of no surface texture design and processing, etc., to achieve Uniform distribution of pits, reduced abrasive wear, and improved operational stability

Active Publication Date: 2017-12-19
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic research is mostly focused on the research of friction materials for ultrasonic motors, but in practice, the rotor friction materials of ultrasonic motors are mechanically ground or polished with metallographic sandpaper to build a certain roughness and used directly without texture design on the surface. and processing

Method used

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  • Surface texture of an ultrasonic motor rotor and its preparation method
  • Surface texture of an ultrasonic motor rotor and its preparation method
  • Surface texture of an ultrasonic motor rotor and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation method of the polyimide composite material used in this example is as follows: according to volume percentage, mix 70% polyimide and 15% polytetrafluoroethylene in alcohol by ball milling, and then add 10% polyimide Aramid fibers, 1% graphene, and aluminum silicate as the balance are mixed thoroughly, then dried at 120°C, crushed, and passed through a 200-mesh sieve. Finally, pour the mixed mold material into the mold for hot pressing and sintering molding. The molding temperature is 375°C, the pressure is 15MPa, and the mold is naturally cooled and demolded to obtain the polyimide composite material as the motor rotor friction material.

[0028] Concrete preparation steps:

[0029] 1. First slice the polyimide composite material to 0.5mm, and then use metallographic sandpaper to polish the material on one side until the surface roughness is less than 0.1μm;

[0030] 2. Use laser etching to construct surface pits on the polished friction material. The a...

Embodiment 2

[0034] The composition and preparation process of the polyimide composite material used in this example are the same as those in Example 1, only the content of graphene is increased to 2% (volume percentage).

[0035] Concrete preparation steps:

[0036] 1. First slice the polyimide composite material to 0.5mm, and then use metallographic sandpaper to polish the material on one side until the surface roughness is less than 0.1μm;

[0037] 2. Use laser etching to construct surface pits on the polished friction material. The average power of laser processing is 20W, the pulse frequency is 20kHz, the speed is 100mm / s, and the number of etching cycles is 4 times;

[0038] 3. Paste the etched rotor friction material on the reverse side to the surface of the aluminum alloy rotor of the ultrasonic motor for use by the ultrasonic motor.

[0039] The surface electron microscope image of the rotor obtained in this embodiment is as follows image 3 As shown, after testing, the characte...

Embodiment 3

[0041] The composition and preparation process of the polyimide composite material used in this example are the same as those in Example 1, only the content of graphene is increased to 3% (volume percentage).

[0042] Concrete preparation steps:

[0043] 1. First slice the polyimide composite material to 0.5mm, and then use metallographic sandpaper to polish the material on one side until the surface roughness is less than 0.1μm;

[0044] 2. Use laser etching to construct surface pits on the polished friction material. The average power of laser processing is 20W, the pulse frequency is 20kHz, the speed is 100mm / s, and the number of etching cycles is 5 times;

[0045] 3. Paste the etched rotor friction material on the reverse side to the surface of the aluminum alloy rotor of the ultrasonic motor for use by the ultrasonic motor.

[0046] The surface electron microscope image of the rotor obtained in this embodiment is as follows Figure 4 As shown, after testing, the charact...

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Abstract

The invention provides an ultrasonic wave motor rotor surface texture and a production method thereof. The surface texture is provided with recesses, and the diameter of each recess is in a range from 200 (mu)m to 400 (mu)m, the depth of each recess is in a range from 89.77 (mu)m to 108.5 (mu)m, and the area density of each recess is in a range from 3.14% to 12.55%. The production method is characterized in that a polyimide composite material is cut into slices and polished to be a material having the roughness less than 0.1(mu)m; the forming of the surface recesses of the polished surface of the material produced by the step A is carried out by adopting a laser etching technology, and at last, the back surface of the polyimide composite material is attached to the ultrasonic motor aluminum alloy rotor surface in an adhesive manner. The surface micro-structure produced by adopting the above mentioned technical scheme is advantageous in that the production is simple and effective, the cost is low, the size is reliable, the distribution is uniform, and operation stability of an ultrasonic motor contact interface is effectively improved, and service lifetime of a rotor friction material is prolonged.

Description

technical field [0001] The invention relates to the field of ultrasonic motors, in particular to a surface texture of an ultrasonic motor rotor and a preparation method thereof. Background technique [0002] Ultrasonic motor is a new type of micro-motor that developed rapidly in the 1980s and has special applications. It is driven based on the vibration of ultrasonic frequency of functional ceramics. Compared with traditional motors, it has low-speed, high-torque output, high power density, start-stop With the advantages of good controllability, precise positioning, and no electromagnetic interference, it has broad application prospects in aerospace, precision instruments and other fields. [0003] Since the ultrasonic motor transmits power through the friction interface, the friction characteristics of the interface are very important to the overall performance of the ultrasonic motor. At present, the friction driving mode of the ultrasonic motor is dry friction between th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02N2/12
CPCH02N2/0065H02N2/123H02N2/22
Inventor 赵盖宋敬伏刘晓亮丁庆军裘进浩
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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