CN117997163A - Pre-pressure rotor system applied to traveling wave ultrasonic motor - Google Patents
Pre-pressure rotor system applied to traveling wave ultrasonic motor Download PDFInfo
- Publication number
- CN117997163A CN117997163A CN202410133852.1A CN202410133852A CN117997163A CN 117997163 A CN117997163 A CN 117997163A CN 202410133852 A CN202410133852 A CN 202410133852A CN 117997163 A CN117997163 A CN 117997163A
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- rotor
- precompression
- motor
- mandrel
- traveling wave
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- 230000005489 elastic deformation Effects 0.000 claims abstract description 7
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 102100027340 Slit homolog 2 protein Human genes 0.000 description 1
- 101710133576 Slit homolog 2 protein Proteins 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/10—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors
- H02N2/16—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing rotary motion, e.g. rotary motors using travelling waves, i.e. Rayleigh surface waves
- H02N2/163—Motors with ring stator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/04—Constructional details
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- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention provides a precompression rotor system applied to a traveling wave ultrasonic motor, which relates to the technical field of ultrasonic motors and comprises: the motor comprises a rotor, a bearing, a motor shell and a mandrel; the rotor, the bearing and the motor shell are sequentially sleeved on the mandrel; the rotor, the bearing and the motor shell are concentrically arranged along the center of the mandrel, a cutting seam, a precompression applying surface and a friction interface are arranged on the rotor, and the cutting seam is used for generating elastic deformation and precompression; the precompression applying surface is in contact connection with the end face of the shaft shoulder of the mandrel; the friction interface is in contact connection with a driving interface of a stator of the ultrasonic motor. The invention has simple structure and easy realization, and is especially suitable for small and miniature ultrasonic motors with compact space; the parts can generate small pre-pressure and large deformation required by the motor without being too thin; and the contact condition of the friction interface of the rotor and the driving surface of the stator is improved.
Description
Technical Field
The invention relates to the technical field of ultrasonic motors, in particular to a precompression rotor system applied to a traveling wave ultrasonic motor.
Background
The ultrasonic motor converts alternating voltage excitation input from the outside into mechanical vibration of the piezoelectric element by using the inverse piezoelectric effect of the piezoelectric element; the piezoelectric element is typically bonded to the stator; the resonance of an elastic component structure formed by the piezoelectric element and the stator is realized by adjusting the excitation frequency, so that each particle on the stator forms a motion of a specific track; when a pre-pressure is applied to the rotor, the rotor is rotated by the friction of the stator drive interface, thereby enabling the electric machine to convert electrical energy into mechanical energy.
In 1983, japanese Sashida proposed and manufactured a traveling wave ultrasonic motor in which a continuously variable cross-section annular structure is designed between a friction interface of a rotor of the motor and a pre-pressure applying surface, the structure being gradually smaller in cross section along a radius increasing direction, so that the rotor has a thin-wall characteristic at a small cross section; in addition, the rotor elastic material is matched, so that the deformation and the pre-compression required by the system are satisfied. The rotor of various improved traveling wave ultrasonic motors subsequently proposed by researchers in the field mostly adopts a classical structure, such as a Chinese patent application number CN116365919A, and discloses an ultrasonic motor with adjustable precompression, and further such as a Chinese patent application number CN108696177A, and discloses a lightweight ultrasonic motor.
The rotor structure needs to ensure flatness and parallelism and cannot warp, so that a rotor friction interface and a stator driving interface are in good contact; therefore, the area of the thin-walled portion of the rotor is controlled to a small extent, and there is also a limit to the thinnest dimension of the thin-walled portion. These objective requirements limit the lower size limit of classical rotor structures. When a small and miniature traveling wave ultrasonic motor or a small hollow traveling wave ultrasonic motor is designed, the design of parts is severely constrained by the size space; if the classical rotor structural design is used, in order to maintain proper pre-compression, parts are required to be thinner, and great difficulty is brought to actual processing; the miniaturization process of the traveling wave ultrasonic motor is retarded to a great extent, and the application range of the traveling wave ultrasonic motor is limited.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a precompression rotor system applied to a traveling wave ultrasonic motor.
In order to achieve the above object, the present invention provides the following solutions:
A precompression rotor system for a traveling wave ultrasonic motor, comprising: the motor comprises a rotor, a bearing, a motor shell and a mandrel; the rotor, the bearing and the motor shell are sequentially sleeved on the mandrel; the rotor, the bearing and the motor shell are concentrically arranged along the center of the mandrel, a cutting seam, a precompression applying surface and a friction interface are arranged on the rotor, and the cutting seam is used for generating elastic deformation and precompression; the precompression applying surface is in contact connection with the end face of the shaft shoulder of the mandrel; the friction interface is in contact connection with a driving interface of a stator of the ultrasonic motor.
Preferably, the rotor radius of the friction interface is larger than that of the precompression applying surface; an annular connection area exists between the friction interface and the pre-pressure application surface.
Preferably, the slits are provided at the annular connection region.
Preferably, the slits at the annular connection region cut according to a vortex line.
Preferably, the stator is assembled on the base, the rotor, the mandrel, the bearing and the motor housing are sequentially mounted on the stator, and the stator and the center of the mandrel are concentrically arranged.
Preferably, a precompression adjusting gasket is arranged between the shaft shoulder end face of the mandrel and the inner ring end face of the bearing.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
The invention provides a precompression rotor system applied to a traveling wave ultrasonic motor, which comprises: the motor comprises a rotor, a bearing, a motor shell and a mandrel; the rotor, the bearing and the motor shell are sequentially sleeved on the mandrel; the rotor, the bearing and the motor shell are concentrically arranged along the center of the mandrel, a cutting seam, a precompression applying surface and a friction interface are arranged on the rotor, and the cutting seam is used for generating elastic deformation and precompression; the precompression applying surface is in contact connection with the end face of the shaft shoulder of the mandrel; the friction interface is in contact connection with a driving interface of a stator of the ultrasonic motor. The invention has simple structure and easy realization, and is especially suitable for small and miniature ultrasonic motors with compact space; the parts can generate small pre-pressure and large deformation required by the motor without being too thin; the contact condition of a rotor friction interface and a stator driving surface is improved; experiments show that compared with a traveling wave ultrasonic motor using a classical rotor structure, the traveling wave ultrasonic motor applying the precompression rotor system has the advantages that the power supply voltage and the power consumption are greatly reduced, and the service life is obviously prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an assembly cross-section of a traveling wave ultrasonic motor embodying the present invention;
FIG. 2 is a schematic cross-sectional view of a lancing rotor structure provided by an embodiment of the present invention;
FIG. 3 is a schematic cross-sectional view of a slit structure of a classical rotor according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a precompression rotor system according to an embodiment of the present invention.
Reference numerals illustrate:
1. A stator; 2. a rotor; 2-a, lancing; 2-b, a precompression applying plane; 2-c, friction interface; 2' -a, classical rotor lancing; 2' -b, classical rotor precompression applying plane; 2' -c, classical rotor friction interface; 3. a pre-pressure adjusting pad; 4. a mandrel; 5. a bearing; 6. a motor housing; 7. and (5) a base.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a precompression rotor system applied to a traveling wave ultrasonic motor, which is particularly suitable for small and miniature ultrasonic motors with compact space, so that small precompression and large deformation required by the motor can be generated without excessively thin parts, and the contact condition of a rotor friction interface and a stator driving surface is improved.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1 to 4, an embodiment of the present invention provides a precompression rotor system for a traveling wave ultrasonic motor, which mainly includes: the rotor 2, the bearing 5, the motor shell 6 and the mandrel 4 are sequentially sleeved on the mandrel 4, and the rotor 2, the bearing 5 and the motor shell 6 are concentrically arranged; the rotor 2 is provided with a slit for generating larger elastic deformation and smaller precompression; the rotor 2 is provided with a precompression applying surface 2-b, and the end surface of the shaft shoulder of the mandrel 4 is contacted with the precompression applying surface 2-b; the rotor 2 is also provided with a friction interface 2-c, and the friction interface 2-c is contacted with a driving interface of the stator 1; under the action of pre-pressure, the large elastic deformation of the slitting rotor 2 can enable the friction interface 2-c to be better attached to the driving interface of the stator 1; less pre-compression reduces wear on the contact interface.
As a further preferred aspect of the present invention, the friction interface 2-c of the rotor 2 is located at a position where the radius of the rotor 2 is large; while the pre-pressure applying surface 2-b is located at a smaller radius of the rotor 2; an annular connecting region exists between the friction interface 2-c of the rotor 2 and the pre-pressure application surface 2-b.
Because the power of the rotation of the rotor 2 is derived from the friction action of the driving interface of the stator 1, the arrangement of the friction interface 2-c with larger radius can lead the motor to have better output performance; when the motor shell 6 and the base 7 are assembled, the motor shell 6 firstly generates pressure on the end face of the shaft shoulder of the mandrel 4 through the bearing 5, then the pressure is transmitted to the rotor 2 through the end face on the other side of the shaft shoulder, and the precompression applying surface 2-b of the rotor 2 is positioned at the position with smaller radius of the rotor 2 because of being close to the position of the mandrel 4; the annular connection area between the friction interface 2-c and the pre-pressure application surface 2-b is the main area of the rotor 2 where effective elastic deformation occurs and which provides the proper pre-pressure required by the system; aiming at the optimized design developed by the annular connection area, the invention solves the technical problem by adopting the foothold of the technical scheme.
As a further preferred aspect of the present invention, slits are provided in the annular connection region between the friction interface 2-c of the rotor 2 and the pre-pressure applying surface 2-b; the annular connecting area is provided with the kerfs, so that the rigidity of the rotor 2 can be effectively reduced, and the elasticity of the rotor 2 can be increased; the friction interface 2-c can better contain amplitude fluctuation of the driving interface of the stator 1, and precompression within a reasonable range exists on the friction interface 2-c all the time; in addition, this design results in limited loss of pre-compression after wear of the friction interface 2-c.
The precompression rotor system shown in the drawings of the present application is illustrative and the actual construction is not limited thereto; for example, the slit rotor is not limited to the structure shown in fig. 2, and the classical rotor slit 2' -a may be provided as in the variable cross-section annular region between the classical rotor friction interface 2' -c and the classical rotor pre-pressure application surface 2' -b shown in fig. 3; therefore, the scheme provided by the application is applied to rotor systems of various traveling wave ultrasonic motors, and is regarded as the protection condition of the application.
As a further preferred aspect of the present invention, the slits formed in the annular connection region of the rotor 2 are cut according to a spiral line (or a helical line); the motor is required to maintain stable output of performance, and the rotor 2 is required to ensure enough circumferential rigidity; and the cutting seam cut according to the vortex-like line (or spiral line) can reduce the axial rigidity of the rotor 2 and simultaneously maintain the circumferential rigidity of the rotor 2 to the maximum extent.
The pitch, number of turns, direction, slit width, number of slits, and distribution of slits of the vortex-like wire slits cannot be used as new innovation points to infringe the right rights of the invention.
As a further preferred aspect of the present invention, the present embodiment further includes a base 7 and a stator 1, wherein the stator 1 is assembled on the base 7, and the rotor 2, the spindle 4, the bearing 5 and the motor housing 6 are sequentially mounted on the stator 1 in a concentric assembly relationship; a precompression adjusting gasket 3 is arranged between the shaft shoulder end surface of the mandrel 4 and the inner ring end surface of the bearing 5; after the motor housing 6 is fixed to the base 7 with screws, a pre-compression space between the housing and the base 7 is fixed inside the motor, and at this time, a proper pre-compression force required for the motor is adjusted by the pre-compression force adjusting washer 3.
The beneficial effects of the invention are as follows:
The invention can ensure that the parts can generate the pre-pressure required by the motor without being too thin; the friction interface of the rotor can be well contacted with the driving surface of the stator, and the abrasion of the contact interface is reduced; the power supply voltage of the motor can be effectively reduced, the power consumption of the motor is obviously reduced, and the service life of the motor is prolonged; the system has simple structure and easy realization, is particularly suitable for small and miniature ultrasonic motors with compact space, and is an ultrasonic motor precompression applying scheme with wide application prospect.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (6)
1. A precompression rotor system for a traveling wave ultrasonic motor, comprising: the motor comprises a rotor, a bearing, a motor shell and a mandrel; the rotor, the bearing and the motor shell are sequentially sleeved on the mandrel; the rotor, the bearing and the motor shell are concentrically arranged along the center of the mandrel, and the rotor is characterized in that a cutting seam, a precompression applying surface and a friction interface are arranged on the rotor, and the cutting seam is used for generating elastic deformation and precompression; the precompression applying surface is in contact connection with the end face of the shaft shoulder of the mandrel; the friction interface is in contact connection with a driving interface of a stator of the ultrasonic motor.
2. The precompression rotor system for a traveling wave ultrasonic motor of claim 1, wherein a rotor radius at a location of the friction interface is greater than a rotor radius at a location of the precompression application surface; an annular connection area exists between the friction interface and the pre-pressure application surface.
3. The precompression rotor system for a traveling wave ultrasonic motor of claim 2, wherein said slits are disposed at said annular connection region.
4. A precompression rotor system for a traveling wave ultrasonic motor according to claim 3, wherein the kerfs at the annular connection region are cut according to eddy wires.
5. The precompression rotor system for a traveling wave ultrasonic motor of claim 1, wherein the stator is mounted on a base, the rotor, the spindle, the bearing, and the motor housing are mounted in sequence on the stator, the stator being disposed concentric with a center of the spindle.
6. The precompression rotor system for a traveling wave ultrasonic motor of claim 1, wherein a precompression adjustment washer is disposed between a shoulder end surface of the mandrel and an inner ring end surface of the bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410133852.1A CN117997163A (en) | 2024-01-31 | 2024-01-31 | Pre-pressure rotor system applied to traveling wave ultrasonic motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410133852.1A CN117997163A (en) | 2024-01-31 | 2024-01-31 | Pre-pressure rotor system applied to traveling wave ultrasonic motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117997163A true CN117997163A (en) | 2024-05-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410133852.1A Pending CN117997163A (en) | 2024-01-31 | 2024-01-31 | Pre-pressure rotor system applied to traveling wave ultrasonic motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117997163A (en) |
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2024
- 2024-01-31 CN CN202410133852.1A patent/CN117997163A/en active Pending
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