CN211296596U - Ultrasonic motor friction increasing structure based on surface texture - Google Patents
Ultrasonic motor friction increasing structure based on surface texture Download PDFInfo
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- CN211296596U CN211296596U CN201922156736.9U CN201922156736U CN211296596U CN 211296596 U CN211296596 U CN 211296596U CN 201922156736 U CN201922156736 U CN 201922156736U CN 211296596 U CN211296596 U CN 211296596U
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- surface texture
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- convex body
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- 230000001965 increasing effect Effects 0.000 title claims abstract description 36
- 239000002783 friction material Substances 0.000 claims abstract description 42
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000000758 substrate Substances 0.000 claims description 31
- 239000002131 composite material Substances 0.000 claims description 18
- 239000004642 Polyimide Substances 0.000 claims description 14
- 229920001721 polyimide Polymers 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 229910021389 graphene Inorganic materials 0.000 claims description 9
- -1 polytetrafluoroethylene Polymers 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 4
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 4
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 229920002530 polyetherether ketone Polymers 0.000 claims description 4
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 4
- 229920013657 polymer matrix composite Polymers 0.000 claims description 3
- 239000011160 polymer matrix composite Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 229920000642 polymer Polymers 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 description 5
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000006061 abrasive grain Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The utility model discloses an ultrasonic motor is with increasing structure of rubbing based on surface texture, including the friction material basement, the material of friction material basement is polymer base combined material, sets up the outer terminal surface at the rotor of ultrasonic motor, and the surface of friction material basement is provided with surface texture, and the structure of surface texture is one kind or two kinds of little convex body or little pit, and little convex body includes the little convex body of regular hexagon, square little convex body, circular little convex body, and little pit includes the little pit of regular hexagon, square little pit, circular little pit. The utility model carries out surface texture on the friction material of the ultrasonic motor, and the existence of the surface texture can increase the friction coefficient under the condition of dry friction, thereby increasing the output torque of the ultrasonic motor; the gaps formed by the surface texture can effectively capture and contain abrasive dust, abrasive wear and furrowing are reduced, and the service life of the ultrasonic motor is prolonged.
Description
Technical Field
The invention relates to the technical field of ultrasonic motors, in particular to a friction increasing structure for an ultrasonic motor, which can improve the output torque of the ultrasonic motor and prolong the service life of the ultrasonic motor.
Background
The ultrasonic motor is a novel micro special motor which is rapidly developed in the 80 th of the 20 th century and has special application, and the working principle of the ultrasonic motor is that the inverse piezoelectric effect of a piezoelectric material is utilized to excite the micro amplitude vibration of an elastic body (a stator) in an ultrasonic frequency band, and the friction action between the stator and a rotor is utilized to drive the rotor to move. Since the ultrasonic motor transmits power through a friction interface, the friction characteristics between the stator and the rotor determine the output performance of the motor. The output torque of the ultrasonic motor can be increased along with the increase of the friction coefficient within a certain range according to the operation characteristics of the ultrasonic motor. At present, the friction material between the stator and the rotor is generally polytetrafluoroethylene-based composite material or polyimide-based composite material, and the friction coefficient is low, so that the output torque of the ultrasonic motor is insufficient. The abrasion of the ultrasonic motor friction pair mainly comprises abrasive wear and fatigue wear, the abrasion can finally cause the damage of a friction interface, and the service life of the motor is shortened and even the motor fails. How to reduce the abrasion and improve the service life of the ultrasonic motor is also an urgent problem to be solved.
Disclosure of Invention
The invention aims to provide a friction increasing structure for an ultrasonic motor based on surface texture, and aims to solve the problems that the ultrasonic motor in the prior art is insufficient in output torque and short in service life.
In order to achieve the purpose, the invention adopts the technical scheme that:
the friction increasing structure for the ultrasonic motor based on the surface texture comprises a friction material substrate, wherein the friction material substrate is made of a polymer matrix composite material and is arranged on the outer end face of a rotor of the ultrasonic motor, the surface texture is arranged on the surface of the friction material substrate, the structure of the surface texture is one or two of a micro-convex body and a micro-concave pit, the micro-convex body comprises a regular hexagon micro-convex body, a square micro-convex body and a round micro-convex body, and the micro-concave pit comprises a regular hexagon micro-concave pit, a square micro-concave pit and a round micro-concave pit.
The friction material substrate is made of polytetrafluoroethylene base, polyimide base, polyether ether ketone base, polyphenylene sulfide base or phenolic resin base composite material. Preferably, the friction material substrate is made of a graphene modified polyimide composite material.
Preferably, the radius of the circular micro-convex body and the circular micro-concave pit is 100-200 μm.
Preferably, the side length of the square microprotrusions and the square micropits is 100-200 μm.
Preferably, the side length of the regular hexagonal micro-convex body and the regular hexagonal micro-concave pit is 100-200 mu m.
Preferably, the area density of the surface texture is 20-50%.
Has the advantages that: compared with the prior art, the invention has the following advantages:
(1) according to the invention, the friction material of the ultrasonic motor is subjected to surface texture, and the friction coefficient can be increased due to the surface texture under the condition of dry friction, so that the output torque of the ultrasonic motor is increased;
(2) the gaps formed by the surface texture can effectively capture and contain abrasive dust, abrasive wear and furrowing are reduced, and the service life of the ultrasonic motor is prolonged.
Drawings
FIG. 1 is a schematic illustration of a prior art ultrasonic motor friction material without surface texturing;
fig. 2 is a schematic diagram of a friction-increasing structure for an ultrasonic motor based on a surface texture, wherein the surface texture is in the shape of a circular convex body;
FIG. 3 is an enlarged view of a portion A of FIG. 2;
in the figure, 1-friction material substrate, 2-surface texture, 3-rotor.
Detailed Description
The invention is further explained below with reference to the drawings.
As shown in fig. 1, the surface of the friction material used in the ultrasonic motor of the related art is smooth.
Based on the friction driving mechanism of the ultrasonic motor, a friction increasing interface is required to maintain larger output torque, so that the invention provides a friction increasing structure for the ultrasonic motor based on surface texture, the surface of a friction material is prepared into a series of surface textures with different forms by methods of laser melting, ultrasonic fine processing and the like, and the surface textures are textured friction surfaces with friction increasing effect to improve the friction coefficient between friction pairs, thereby being capable of improving the output torque of the ultrasonic motor. Due to the fact that the gaps in the surface texture can well capture and contain abrasive dust and abrasive grains generated by abrasion, the abrasion rate can be reduced while the friction coefficient is improved, and the service life of the ultrasonic motor is prolonged.
As shown in fig. 2, the friction increasing structure for the ultrasonic motor based on the surface texture comprises a friction material substrate 1, wherein the friction material substrate 1 is made of a polymer matrix composite material and is arranged on the outer end face of a rotor of the ultrasonic motor, the surface texture 2 is arranged on the surface of the friction material substrate 1, the surface texture structure is one or two of a micro-convex body and a micro-concave pit, the micro-convex body comprises a regular hexagonal micro-convex body, a square micro-convex body and a round micro-convex body, and the micro-concave pit comprises a regular hexagonal micro-concave pit, a square micro-concave pit and a round micro-concave pit.
The friction material substrate 1 is made of polytetrafluoroethylene, polyimide, polyether ether ketone, polyphenylene sulfide or phenolic resin based composite materials. In the invention, the material of the friction material substrate is preferably a graphene modified polyimide composite material, which is disclosed in the Chinese patent with the publication number of CN105820567A, which was previously applied by the applicant of the invention.
Wherein the radius of the round micro-convex body and the round micro-concave pit is 100-200 μm, the side length of the square micro-convex body and the square micro-concave pit is 100-200 μm, and the side length of the regular hexagon micro-convex body and the regular hexagon micro-concave pit is 100-200 μm.
Wherein the area density of the surface texture is 20-50%, namely the area of the surface texture accounts for 20-50% of the surface area of the friction material substrate.
The present invention is further illustrated by the following specific examples.
Example 1
The material of the friction material substrate is graphene modified polyimide-based composite material, the thickness of the composite material is 0.25mm, the surface texture form is a circular convex body, the diameter of the composite material is 100 mu m, and the area density of the composite material is 50%. The friction coefficient is increased by 20%, the output torque of the ultrasonic motor after assembly is increased by 23%, and the efficiency is increased by 18%.
Example 2
The material of the friction material substrate is graphene modified polyimide-based composite material, the thickness of the friction material substrate is 0.25mm, the surface texture form is a circular micro-pit, the diameter of the circular micro-pit is 100 micrometers, the area density of the circular micro-pit is 50%, the friction coefficient is increased by 22%, the output torque of the ultrasonic motor after assembly is improved by 27%, and the efficiency is increased by 20%.
Example 3
The material of the friction material substrate is graphene modified polyimide-based composite material, the thickness of the friction material substrate is 0.25mm, the surface texture form is square microprotrusions, the diameter of the friction material substrate is 150 micrometers, the area density of the friction material substrate is 45%, the friction coefficient is increased by 18%, the output torque of the ultrasonic motor after assembly is improved by 20%, and the efficiency is increased by 16%.
Example 4
The material of the friction material substrate is graphene modified polyimide-based composite material, the thickness of the friction material substrate is 0.25mm, the surface texture form is square micro-pits, the diameter of the micro-pits is 150 micrometers, the area density of the micro-pits is 45%, the friction coefficient is increased by 19%, the output torque of the ultrasonic motor after assembly is increased by 22%, and the efficiency is increased by 18%.
Example 5
The material of the friction material substrate is graphene modified polyimide-based composite material, the thickness of the friction material substrate is 0.25mm, the surface texture form is regular hexagon microprotrusions, the diameter of the friction material substrate is 100 micrometers, the area density of the friction material substrate is 40%, the friction coefficient is increased by 13%, the output torque of the ultrasonic motor after assembly is increased by 16%, and the efficiency is increased by 14%.
Example 6
The material of the friction material substrate is graphene modified polyimide-based composite material, the thickness of the friction material substrate is 0.25mm, the surface texture form is regular hexagon micro pits, the diameter of the surface texture is 100 micrometers, the area density of the surface texture is 40%, the friction coefficient is increased by 15%, the output torque of the ultrasonic motor after assembly is improved by 18%, and the efficiency is increased by 16%.
The above embodiments are only for the size and area density of the surface texture form optimized for the graphene-modified polyimide-based friction material, and the size and area density of the surface texture form of different polymer-based friction materials should be different due to different elastic modulus, hardness and frictional wear performance, and the size and area density of the surface texture form should be redesigned when selecting composite materials with different performances such as polytetrafluoroethylene, polyether ether ketone, polyphenylene sulfide, phenolic resin, and the like, which also have different influences on the output torque and the rotation speed of the motor.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The utility model provides an ultrasonic motor is with increasing structure of rubbing based on surface texture which characterized in that: the friction material substrate is made of a polymer matrix composite material and is arranged on the outer end face of a rotor of an ultrasonic motor, the surface of the friction material substrate is provided with a surface texture, the structure of the surface texture is one or two of a micro-convex body and a micro-concave pit, the micro-convex body comprises a regular hexagon micro-convex body, a square micro-convex body and a round micro-convex body, and the micro-concave pit comprises a regular hexagon micro-concave pit, a square micro-concave pit and a round micro-concave pit.
2. The surface texture based ultrasonic motor friction increasing structure according to claim 1, characterized in that: the friction material substrate is made of polytetrafluoroethylene base, polyimide base, polyether ether ketone base, polyphenylene sulfide base or phenolic resin base composite material.
3. The surface texture based ultrasonic motor friction increasing structure according to claim 2, characterized in that: the friction material substrate is made of a graphene modified polyimide composite material.
4. The surface texture based ultrasonic motor friction increasing structure according to claim 1, characterized in that: the radius of the circular micro-convex bodies and the circular micro-concave pits is 100-200 mu m.
5. The surface texture based ultrasonic motor friction increasing structure according to claim 1, characterized in that: the side length of the square micro-convex body and the square micro-concave pit is 100-200 mu m.
6. The surface texture based ultrasonic motor friction increasing structure according to claim 1, characterized in that: the side length of the regular hexagonal micro-convex body and the regular hexagonal micro-concave pit is 100-200 mu m.
7. The surface texture based ultrasonic motor friction increasing structure according to claim 1, characterized in that: the area density of the surface texture is 20-50%.
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| CN201922156736.9U CN211296596U (en) | 2019-12-05 | 2019-12-05 | Ultrasonic motor friction increasing structure based on surface texture |
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| CN201922156736.9U CN211296596U (en) | 2019-12-05 | 2019-12-05 | Ultrasonic motor friction increasing structure based on surface texture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110896288A (en) * | 2019-12-05 | 2020-03-20 | 南京航空航天大学 | Ultrasonic motor friction increasing structure based on surface texture |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110896288A (en) * | 2019-12-05 | 2020-03-20 | 南京航空航天大学 | Ultrasonic motor friction increasing structure based on surface texture |
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