CN220673537U

CN220673537U - Noise reduction motor

Info

Publication number: CN220673537U
Application number: CN202322122242.5U
Authority: CN
Inventors: 邱克难
Original assignee: Shanghai Leizhi Motor Co ltd; Leadshine Technology Co Ltd
Current assignee: Shanghai Leizhi Motor Co ltd; Leadshine Technology Co Ltd
Priority date: 2023-08-08
Filing date: 2023-08-08
Publication date: 2024-03-26
Anticipated expiration: 2033-08-08

Abstract

The utility model provides a noise reduction motor, which is characterized in that: comprising the following steps: the sound absorption wedge comprises a shell, a stator assembly, a rotor assembly and a sound absorption wedge; the stator assembly is fixedly arranged inside the machine shell, the rotor assembly is movably arranged inside the machine shell and is in contact with the stator assembly, and the sound absorption wedge piece is arranged at an end cover inside the machine shell. The noise reduction motor provided by the utility model can absorb electromagnetic noise between the stator and the rotor and/or mechanical noise of a bearing and/or aerodynamic noise in the running process by the sound absorption wedge piece.

Description

Noise reduction motor

Technical Field

The utility model relates to the technical field of motors, in particular to a noise reduction motor.

Background

In recent years, in order to cope with the problem of pollution of automobile exhaust gas, which is more and more serious, the use of electric automobiles has become a mainstream trend. The electric automobile adopts a power assembly form of a driving motor and a speed reducer, and has simpler structure. The permanent magnet synchronous motor has the advantages of small volume, light weight, high efficiency, high power factor, large starting torque and the like, and is widely applied to the electric automobile industry at present.

However, since the electric vehicle does not have the masking effect of the engine, the noise of the electric drive (driving motor+decelerator) system becomes a main noise source, wherein the main noise sources are electromagnetic noise, mechanical noise, aerodynamic noise. Electromagnetic noise is mainly electromagnetic force harmonic wave which changes with time and space and is generated by interaction of stator and rotor harmonic magnetic fields, the electromagnetic force harmonic wave acts on a stator shell, and resonance and radiation noise are generated when the electromagnetic force harmonic frequency is the same as or close to the natural frequency of a stator assembly. Mechanical noise is mainly due to noise generated by friction of motor parts (such as bearings), geometric irregularities (such as rotor imbalance), etc., and generally becomes larger with increasing rotational speed and load current. Aerodynamic noise is eddy current noise generated by gas during operation of the motor, and the like.

Most of the above noise processing methods are performed in such a manner that the processing direction is reversed from the motor control field, but the actual noise effect is not ideal.

Disclosure of Invention

In order to solve the problem of excessive noise of an electric drive system in the prior art, the utility model provides a noise reduction motor, which comprises: the sound absorption wedge comprises a shell, a stator assembly, a rotor assembly and a sound absorption wedge; the stator assembly is fixedly arranged inside the machine shell, the rotor assembly is movably arranged inside the machine shell and is in contact with the stator assembly, and the sound absorption wedge piece is arranged at an end cover inside the machine shell.

Preferably, the casing comprises a front end cover and a rear end cover, and the sound absorption wedge member is arranged on one side of the front end cover close to the stator assembly and/or one side of the rear end cover close to the stator assembly. Noise can be absorbed more effectively from a plurality of directions. Preferably, the sound absorption wedge member is a conical structure with a cavity structure in the middle. Noise can be absorbed more effectively.

Preferably, a brake is further included, the brake being disposed intermediate the sound absorbing wedge and the stator assembly. The sound absorbing wedge also absorbs noise generated by the brake.

Preferably, the section of the sound absorption wedge piece along the vertical direction is isosceles trapezoid. The tip of the sound absorbing wedge is properly smoothed, a small amount of absorption area is reduced by a single wedge, the height of the sound absorbing wedge can be greatly reduced, the integral layout of a plurality of sound absorbing wedges is facilitated, and the absorption noise with the maximum effect is realized.

Preferably, the sound absorbing wedge is mounted in the casing through bottom adhesion. The process is simple and reliable.

Preferably, the cavity structure is two-section type, including the round platform shape cavity and the cylindrical cavity of upper end of bottom, round platform shape cavity and cylindrical cavity intercommunication and coaxial setting.

Preferably, the cone angles of the sound absorption wedge and the truncated cone-shaped cavity are 30-45 degrees. The diameter of the top end of the sound absorption wedge is twice that of the cylindrical cavity, and the diameter of the top end of the truncated cone-shaped cavity is three times that of the cylindrical cavity. The cone angle is set in the range, sound wave reflection can be repeatedly absorbed between wedge pieces, and the noise reduction effect is good.

Preferably, the length of the cylindrical cavity in the vertical direction is equal to the length of the truncated cone-shaped cavity in the vertical direction. The mechanical strength and the service life of the sound absorption wedge piece can be higher.

Drawings

For a clearer description of embodiments of the utility model or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.

Fig. 1 is a schematic side sectional structure of a noise reduction motor according to an embodiment of the present disclosure;

FIG. 2 is an enlarged view at A in FIG. 1;

FIG. 3 is an enlarged view at B in FIG. 1;

FIG. 4 is a front view of a rear cover incorporating sound absorbing wedges;

fig. 5 is a schematic view of a wedge in front cross-sectional configuration.

Wherein: 1. rear end cover, 2, front end cover, 3, sound absorption wedge, 4, stator module, 5, rotor module, 6, stopper, 11, recess, 31, round platform shape cavity, 32, cylindrical cavity, 33, sound absorption wedge top.

Detailed Description

In order to better understand the aspects of the present utility model, the present utility model will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1 to 5, the present utility model provides a noise reduction motor including a housing, a stator assembly 4, a rotor assembly 5, and a sound absorption wedge 3; the stator assembly 4 is fixedly arranged inside the machine shell, the rotor assembly 5 is movably arranged inside the machine shell and is in contact with the stator assembly 4, and the sound absorption wedge 3 is arranged at an end cover inside the machine shell. Electromagnetic noise between stator and rotor and/or mechanical noise of a bearing and/or aerodynamic noise in the running process can be generated by absorbing the electromagnetic noise in the motor cavity through the sound absorption wedge 3, so that noise transmission to the outside of the motor is reduced.

In some examples, the housing includes a front end cover 2 and a rear end cover 1, and the sound absorbing wedge 3 is disposed on a side of the front end cover 2 adjacent to the stator assembly 4 and/or a side of the rear end cover 1 adjacent to the stator assembly 4. Noise can be absorbed more effectively from a plurality of directions.

In some examples, the sound absorbing wedge is a tapered structure with a cavity structure disposed therebetween. Noise can be absorbed more effectively.

In some examples, the sound absorbing wedge 3 is mounted in the cavity 11 of the rear end cap 1 with its tip facing the motor front end 2. The size of the motor can not be increased while the noise can be effectively absorbed.

In some examples, the noise reduction motor further includes a brake 6, the brake 6 being disposed intermediate the sound absorbing wedge 3 and the stator assembly 4. The sound absorbing wedge also absorbs noise generated by the brake 6.

In some examples, the section of the sound absorbing wedge 3 along the vertical direction is isosceles trapezoid. The top 33 of the sound-absorbing wedge member is properly smoothed, a small amount of absorption area of the single sound-absorbing wedge member 3 is reduced, the height of the single sound-absorbing wedge member can be greatly reduced, the integral layout of the plurality of sound-absorbing wedge members 3 is facilitated, and the maximum effect of noise absorption is realized.

In some examples, the sound absorbing wedge 3 is mounted in the casing by bottom adhesion. The process is simple and reliable.

Specifically, the cavity structure is two-section, and comprises a truncated cone-shaped cavity 31 at the bottom and a cylindrical cavity 32 at the upper end, wherein the truncated cone-shaped cavity 31 and the cylindrical cavity 32 are communicated and coaxially arranged; the height of the truncated cone-shaped cavity 31 in the vertical direction is equal to the height of the cylindrical cavity 32 in the vertical direction.

In some examples, the cone angle α of the sound absorbing wedge 3 is 30 ° -45 °. The cone angle beta of the truncated cone-shaped cavity 31 is equal to the cone angle alpha of the sound absorption wedge 3, and is 30 degrees to 45 degrees. The cone angle alpha of the sound absorption wedge 3 and the cone angle beta of the truncated cone-shaped cavity 31 are arranged in the range, and sound wave reflection can be repeatedly absorbed between the wedges, so that the noise reduction effect is good.

In some examples, the sound absorbing wedge tip diameter is twice the cylindrical cavity diameter and the frustoconical cavity tip diameter is three times the cylindrical cavity diameter. The sound-absorbing wedge 3 ensures that the utilization rate of the sound-absorbing area of the wedge is the highest, and the sound-absorbing effect is the best.

In some examples, the length of the cylindrical cavity 32 in the vertical direction is equal to the length of the truncated cone-shaped cavity 31 in the vertical direction. So as to ensure the uniform structure of the wedge member, and the mechanical strength and the service life are higher.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements is inherent to. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. In addition, the parts of the above technical solutions provided in the embodiments of the present application, which are consistent with the implementation principles of the corresponding technical solutions in the prior art, are not described in detail, so that redundant descriptions are avoided.

The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the principles of the utility model, which are also intended to fall within the scope of the appended claims.

Claims

1. A noise reduction motor, comprising: the sound absorption wedge comprises a shell, a stator assembly, a rotor assembly and a sound absorption wedge; the stator assembly is fixedly arranged inside the machine shell, the rotor assembly is movably arranged inside the machine shell and is in contact with the stator assembly, and the sound absorption wedge piece is arranged at an end cover inside the machine shell.

2. The noise reducing motor of claim 1, wherein the housing comprises a front end cover and a rear end cover, and the sound absorbing wedge is disposed on a side of the front end cover adjacent to the stator assembly and/or a side of the rear end cover adjacent to the stator assembly.

3. The noise reduction motor of claim 2, wherein the sound absorbing wedge is a conical structure with a cavity structure in the middle, and the top of the sound absorbing wedge faces the stator assembly.

4. The noise reducing motor of claim 1 or 3, further comprising a brake disposed intermediate the sound absorbing wedge and the stator assembly.

5. A noise reducing motor as claimed in claim 1 or claim 3, wherein the sound absorbing wedge is isosceles trapezoid in cross section in the vertical direction.

6. The noise reducing motor of claim 1, wherein the sound absorbing wedge is mounted in the housing by bottom bonding.

7. The noise reduction motor of claim 3, wherein the cavity structure is two-stage and comprises a truncated cone-shaped cavity at the bottom and a cylindrical cavity at the upper end, and the truncated cone-shaped cavity and the cylindrical cavity are communicated and coaxially arranged.

8. The noise reducing motor of claim 7, wherein the cone angle of the sound absorbing wedge and the frustoconical cavity are each 30 ° -45 °.

9. The noise reducing motor of claim 7, wherein the sound absorbing wedge tip diameter is twice the cylindrical cavity diameter and the frustoconical cavity tip diameter is three times the cylindrical cavity diameter.

10. The noise reduction motor of claim 7, wherein the length of the cylindrical cavity in the vertical direction is equal to the length of the frustoconical cavity in the vertical direction.