Brushless servo motor capable of damping and reducing noise

Abstract

The utility model discloses a damping and noise-reducing servo brushless motor, which comprises a shell, a rotor and a stator, and is characterized in that the shell comprises a first casing, a second casing, a connecting sleeve and a rear cover, the end face of the first end of the connecting sleeve abuts against the end face of the first end of the first casing, and the second end of the connecting sleeve abuts against the end face of the first end of the second casing; the rotor comprises a rotating shaft, a permanent magnet, a meson and an elastic element, the rotating shaft is in clearance fit with inner rings of the first bearing and the second bearing, the first end of the elastic element abuts against the first end of the permanent magnet, and the second end of the elastic element abuts against the inner ring of the first bearing; one end of the stator is fixedly installed on the inner wall of the first machine shell, the other end of the stator is fixedly installed on the inner wall of the second machine shell, and the stator surrounds the permanent magnet. According to the utility model, the housing is manufactured in a split manner, and after parts in the housing are respectively arranged on the first housing and the second housing, the connecting sleeve is arranged between the first housing and the second housing, so that the assembly efficiency of the motor is improved, and the assembly error is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of motors, and more specifically, relates to a servo brushless motor with shock absorption and noise reduction. Background Art

[0002] The housing is an important part of the motor. It protects the electrical and mechanical components inside the motor from external physical and chemical damages. At the same time, it also plays the role of maintaining the overall rigidity and smooth operation of the motor, providing reliable and consistent functions, maintaining good performance, and ensuring the normal operation of the motor. In addition, the housing is used to install the internal body and provides installation space for the magnetic poles and armatures of the motor.

[0003] The existing housings generally adopt an integral structure, which is made of a whole piece of metal. The length of the housing with an integral structure is relatively large, and it is difficult to mold during manufacturing, and the concentricity and perpendicularity are not good.

[0004] The relatively long length of the housing makes it inconvenient to install the parts inside the housing. The installation of the internal parts needs to be carried out step by step. Often, it is necessary to wait for a group of parts to be installed before installing another group of parts, resulting in a long waiting time, low assembly efficiency, and poor installation visibility of the parts inside the integral housing, which is prone to large assembly errors, leading to the need for rework or scrapping. In addition, due to poor concentricity, the motor is prone to jump (vibrate) during operation, and the vibration and noise of the housing are relatively large. And if the perpendicularity of the housing (i.e., the perpendicularity of the end face of the housing for fitting with the end cover) is not good, it will cause a radial deviation to the bearing center and affect the air gap of the motor, thereby affecting the operating performance and efficiency of the motor.

[0005] The rotating shaft of the motor is generally installed on the housing through bearings. The bearings are prone to tremor and generate vibration, and the bearings are prone to wear and fatigue, thus increasing the maintenance cost. Moreover, the bearing vibration will cause the motor to run unbalanced, generate shock forces, and thus reduce the operating efficiency of the motor. In addition, the bearing vibration will also cause noise. Summary of the Utility Model

[0006] Aiming at the above defects or improvement requirements of the prior art, the utility model provides a servo brushless motor with shock absorption and noise reduction. The housing adopts a split structure. After the parts inside the housing are installed on the first housing and the second housing respectively, the assembly can be carried out simultaneously, and then a connecting sleeve is installed between the first housing and the second housing, which improves the assembly efficiency, reduces the assembly error, and can reduce the noise.

[0007] To achieve the above object, according to the utility model, there is provided a servo brushless motor with shock absorption and noise reduction, which is characterized in that it includes a housing, a rotor, and a stator, wherein:

[0008] The housing includes a first housing, a second housing, a connecting sleeve, and a rear cover. There is a gap between the first housing and the second housing. The connecting sleeve is located between the first housing and the second housing, and the end face of the first end of the connecting sleeve abuts against the end face of the first end of the first housing, and the end face of the second end of the connecting sleeve abuts against the end face of the first end of the second housing. The rear cover is fixedly installed at the second end of the second housing;

[0009] The rotor includes a rotating shaft, a permanent magnet, a spacer, and an elastic element. The rotating shaft is in clearance fit with the inner ring of the first bearing and the inner ring of the second bearing. The outer ring of the first bearing is fixedly installed on the first housing, and the outer ring of the second bearing is fixedly installed on the second housing. The permanent magnet, the spacer, and the elastic element are respectively fixedly sleeved on the rotating shaft. The inner ring of the first bearing and the permanent magnet cooperate to clamp the elastic element and cause elastic deformation of the elastic element, and the inner ring of the second bearing and the permanent magnet cooperate to clamp the spacer;

[0010] One end of the stator is fixedly installed on the inner wall of the first housing and the other end is fixedly installed on the inner wall of the second housing. The stator surrounds the permanent magnet, and the connecting sleeve is sleeved on the outer wall of the stator.

[0011] Preferably, the elastic element is a silica gel sleeve.

[0012] Preferably, the stator is in clearance fit with both the first housing and the second housing, and the stator is fixedly connected to the first housing and the second housing by gluing.

[0013] Preferably, anti-slip patterns are provided on the outer wall of the connecting sleeve.

[0014] Preferably, the inner diameter of the connecting sleeve is smaller than the outer diameter of the stator so that the connecting sleeve is sleeved on the outer wall of the stator in a taut state.

[0015] Preferably, an FPC is installed on the rear cover. The FPC is electrically connected to the stator and extends to the outside of the rear cover.

[0016] Preferably, the second end of the second housing is detachably connected to the rear cover.

[0017] Preferably, the first housing includes an integrally formed main housing and an end cover. The end cover is provided at one end of the main housing away from the second housing. The stator is installed on the inner wall of the main housing, the first bearing is installed on the inner wall of the end cover, and the end of the end cover covers the first bearing.

[0018] Preferably, a magnetic encoder is further included. The magnetic encoder includes a magnetic wheel and a reading head which cooperate with each other. The magnetic wheel is fixedly installed on the rotating shaft, and the reading head is fixedly installed on the rear cover.

[0019] Preferably, positioning holes are provided on the rear cover for positioning the magnetic encoder.

[0020] Generally speaking, compared with the prior art by the above technical solution conceived by the present utility model, the following beneficial effects can be achieved:

[0021] 1) For a servo brushless motor with shock absorption and noise reduction of the present utility model, the outer shell of the motor adopts a split structure, which divides the outer shell into a first housing, a connecting sleeve and a second housing. The processing and mold opening of the shortened housing are easy. Moreover, after the parts of the motor are installed on the first housing and the second housing respectively, the first housing and the second housing are connected by the connecting sleeve. The assembly of the outer shell and the parts on the outer shell is also relatively simple, which improves the assembly efficiency of the motor and reduces the assembly error.

[0022] 2) For a servo brushless motor with shock absorption and noise reduction of the present utility model, the first housing and the second housing of the outer shell are manufactured separately. Compared with the integral outer shell, the lengths of the split first housing and the second housing are reduced. It is easy to ensure the concentricity and perpendicularity during manufacturing and assembly, ensure the appropriate air gap of the motor, reduce the radial deviation caused to the centers of the first bearing and the second bearing, and also reduce the jumping and noise during the operation of the motor.

[0023] 3) For a servo brushless motor with shock absorption and noise reduction of the present utility model, the outer shell uses a connecting sleeve made of silicone rubber material to connect the first housing and the second housing. The connecting sleeve made of silicone rubber material can absorb the abnormal sound of the whole outer shell and reduce the noise during the operation of the motor.

[0024] 4) For a servo brushless motor with shock absorption and noise reduction of the present utility model, a silicone rubber sleeve is adopted between the permanent magnet and the first bearing. The silicone rubber sleeve can effectively reduce vibration and absorb vibration, thereby reducing the vibration of the first bearing and improving the service life of the first bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a three-dimensional schematic diagram of the present utility model;

[0026] Figure 2 is an exploded schematic diagram of the present utility model;

[0027] Figure 3 is a front view of the present utility model;

[0028] Figure 4 is Figure 3 a cross-sectional view taken along line A-A in DETAILED DESCRIPTION OF THE INVENTION

[0029] In order to make the purpose, technical solutions and advantages of the present utility model clearer and more understandable, the present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. In addition, the technical features involved in the various embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0030] Referring to Figures 1 to 4 , a servo brushless motor for shock absorption and noise reduction, comprising a housing, a rotor and a stator 10.

[0031] The housing includes a first housing 2, a second housing 4, a connecting sleeve 3 and a rear cover 5. The housing adopts a split structure. There is a gap between the first housing 2 and the second housing 4, that is, the first housing 2 and the second housing 4 are separated. The connecting sleeve 3 is located between the first housing 2 and the second housing 4. The end face of the first end of the connecting sleeve 3 abuts against the end face of the first end of the first housing 2. The end face of the second end of the connecting sleeve 3 abuts against the end face of the first end of the second housing 4. The rear cover 5 is fixedly installed at the second end of the second housing 4. The second end of the second housing 4 is preferably detachably connected to the rear cover 5, so that the rear cover 5 can be separated from the second housing 4. The second housing 4 and the rear cover 5 can be detachably connected by means of bolt connection.

[0032] The rotor includes a rotating shaft 1, a permanent magnet 9, a spacer 7 and an elastic element 8. The rotating shaft 1 is in clearance fit with the inner ring of the first bearing 11 and the inner ring of the second bearing 12. That is, there are clearances between the rotating shaft 1 and the inner rings of the first bearing 11 and the second bearing 12, and the clearance fits are relatively small, so that the first bearing 11 and the second bearing 12 can support the rotating shaft 1. The outer ring of the first bearing 11 is fixedly installed on the first housing 2. The outer ring of the second bearing 12 is fixedly installed on the second housing 4. The permanent magnet 9, the spacer 7 and the elastic element 8 are respectively fixedly sleeved on the rotating shaft 1. The inner ring of the first bearing 11 and the permanent magnet 9 cooperate to clamp the elastic element 8 and cause the elastic element 8 to produce elastic deformation, so that the elastic element 8 can always apply an elastic force on the inner ring of the first bearing 11. The inner ring of the second bearing 12 and the permanent magnet 9 cooperate to clamp the spacer 7. The elastic element 8 is integrally cylindrical, preferably a hollow silica gel sleeve. Silica gel can reduce noise and performs well in terms of noise reduction.

[0033] Since the elastic element 8 is clamped by the inner ring of the first bearing 11 and the permanent magnet 9, the axial movement of the elastic element 8 is limited. And since the elastic element 8 is fixedly sleeved on the rotating shaft 1, the rotating shaft 1 is also axially limited. The rotation of the rotating shaft 1 can drive the inner ring of the first bearing 11 to rotate through the elastic element 8, and drive the inner ring of the second bearing 12 to rotate through the permanent magnet 9 and the spacer 7.

[0034] The spacer 7 can be a copper spacer. It is cylindrical as a whole and is installed on the rotating shaft 1 to play a positioning role, facilitating the installation of parts such as the permanent magnet 9 and the second bearing 12 on the rotating shaft 1 and obtaining the installation positions of parts such as the permanent magnet 9 and the second bearing 12, so as to facilitate the control of the length of the rotating shaft 1 extending from the housing (the length of the output shaft).

[0035] One end of the stator 10 is fixedly installed on the inner wall of the first housing 2 and the other end is fixedly installed on the inner wall of the second housing 4. The stator 10 surrounds the permanent magnet 9. The outer wall of the stator 10 is sleeved with the connecting sleeve 3, and the outer diameter of the stator 10 is larger than the inner diameter of the connecting sleeve 3. The connecting sleeve 3 has elasticity and is always in a taut state after being sleeved on the outer wall of the stator 10. Moreover, both ends of the connecting sleeve 3 are abutted against the first housing 2 and the second housing 4, so the connecting sleeve 3 will not fall off. The connecting sleeve 3 made of silicone rubber can absorb abnormal noises during the operation of the motor.

[0036] The stator 10 is in clearance fit with both the first housing 2 and the second housing 4, and the stator 10 is fixedly connected to both the first housing 2 and the second housing 4 by means of gluing. During assembly, the first housing 2 and the second housing 4 are positioned according to the stator 10. The first housing 2 and the second housing 4 are both in sliding fit with the stator 10 and can slide relative to each other. After sliding in place, the first housing 2 and the second housing 4 are both fixedly connected to the stator 10 by stator potting glue. And the inner diameter of the connecting sleeve 3 is slightly smaller than the outer diameter of the stator 10, so the connecting sleeve 3 is in a taut state when sleeved on the stator 10 and will not fall off. The connecting sleeve 3 is preferably cylindrical as a whole, and anti-slip lines 31 are preferably provided on the outer wall of the connecting sleeve 3 to facilitate the movement of the connecting sleeve 3 to install the connecting sleeve 3 in the space between the first housing 2 and the second housing 4. When the motor is assembled, the first housing 2 and the second housing 4 at both ends and the parts inside them are installed first. And since the connecting sleeve 3 has elasticity, the connecting sleeve 3 can be sleeved on the first housing 2 or the second housing 4 and the connecting sleeve 3 can be moved. The connecting sleeve 3 can be moved between the first housing 2 and the second housing 4 and sleeved on the outer wall of the stator 10 in a taut state.

[0037] Compared with an integral shell structure, the shell of the utility model is divided into parts such as a first shell 2, a second shell 4, a connecting sleeve 3 and a back cover 5. The lengths of the first shell 2 and the second shell 4 for installing the stator are shortened, and it is easy to accurately control the concentricity and verticality accuracy of the first shell 2 and the second shell 4 during manufacturing to ensure that the concentricity and verticality meet the requirements, thereby improving the concentricity and verticality accuracy of the overall shell after assembly.

[0038] Furthermore, an FPC 6 is installed on the rear cover 5 , the FPC 6 is electrically connected to the stator 10 , and the FPC 6 extends to the outside of the rear cover 5 , so as to facilitate the connection with an external power source or control element.

[0039] Furthermore, the first housing 2 includes an integrally formed main housing 21 and an end cover 22, the end cover 22 being arranged at one end of the main housing 21 away from the second housing 4, the stator 10 being mounted on the inner wall of the main housing, the first bearing 11 being mounted on the inner wall of the end cover 22, and the end of the end cover 22 covering the first bearing 11 to prevent external dust and the like from entering the first bearing 11.

[0040] Furthermore, a magnetic encoder is included, and the magnetic encoder includes a magnetic wheel 13 and a reading head 14 that cooperate with each other. The magnetic wheel 13 is fixedly mounted on the rotating shaft 1, and the reading head 14 is fixedly mounted on the rear cover 5. The rotation information of the magnetic wheel 13 is obtained by changing the magnetic field. The magnetic encoder is used to obtain the rotation data of the rotating shaft 1. The second housing 4 has a bearing chamber 41 for mounting the second bearing 12, and the rear cover 5 has a receiving hole for accommodating the magnetic encoder. The rear cover 5 is also provided with a positioning hole for positioning the magnetic encoder.

[0041] The housing of the utility model is set as a split structure of the first housing 2, the second housing 4 and the rubber sleeve, which can facilitate the overall assembly and improve the assembly efficiency. Moreover, the connecting sleeve 3 made of silicone rubber between the first housing 2 and the second housing 4 can effectively reduce the vibration of the housing and the motor as a whole when the motor is installed on the load. In addition, the utility model is provided with an elastic element 8 between the first bearing 11 and the stator 10. When the motor is running, the elastic element 8 will always apply an axial load to the inner ring of the first bearing 11, which is used to reduce the vibration and jump of the first bearing 11, improve the rotation accuracy and rigidity of the rotor, and prevent abnormal noise of the bearing caused by vibration and resonance.

[0042] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A brushless servo motor with vibration reduction and noise reduction, characterized in that: It includes a housing, a rotor and a stator, wherein: The housing comprises a first housing, a second housing, a connecting sleeve and a back cover, there is a gap between the first housing and the second housing, the connecting sleeve is located between the first housing and the second housing, and the end surface of the first end of the connecting sleeve abuts against the end surface of the first end of the first housing, the end surface of the second end of the connecting sleeve abuts against the end surface of the first end of the second housing, the back cover is fixedly mounted on the second end of the second housing, and the connecting sleeve is made of silicone rubber material; The rotor comprises a rotating shaft, a permanent magnet, a meson and an elastic element. The rotating shaft is loosely matched with the inner ring of the first bearing, and the rotating shaft is loosely matched with the inner ring of the second bearing. The outer ring of the first bearing is fixedly mounted on the first housing, and the outer ring of the second bearing is fixedly mounted on the second housing. The permanent magnet, the meson and the elastic element are respectively fixedly mounted on the rotating shaft. The inner ring of the first bearing and the permanent magnet are loosely matched to clamp the elastic element and allow the elastic element to generate elastic deformation. The inner ring of the second bearing and the permanent magnet are loosely matched to clamp the meson. One end of the stator is fixedly mounted on the inner wall of the first housing and the other end is fixedly mounted on the inner wall of the second housing. The stator surrounds the permanent magnet, and the outer wall of the stator is sleeved with the connecting sleeve.

2. A brushless servo motor with vibration reduction and noise reduction according to claim 1, characterized in that: The elastic element is a silicone sleeve.

3. The servo brushless motor with vibration reduction and noise reduction according to claim 1, characterized in that: The stator is clearance-fitted with the first housing and the second housing, and the stator is fixedly connected with the first housing and the second housing by gluing.

4. The servo brushless motor with vibration reduction and noise reduction according to claim 1, characterized in that: The outer wall of the connecting sleeve is provided with anti-slip grooves.

5. The servo brushless motor with vibration reduction and noise reduction according to claim 1, characterized in that: The inner diameter of the connecting sleeve is smaller than the outer diameter of the stator, so that the connecting sleeve can be sleeved on the outer wall of the stator in a taut state.

6. The servo brushless motor with vibration reduction and noise reduction according to claim 1, characterized in that: An FPC is mounted on the rear cover, the FPC is electrically connected to the stator, and the FPC extends to the outside of the rear cover.

7. The servo brushless motor with vibration reduction and noise reduction according to claim 1, characterized in that: The second end of the second housing is detachably connected to the back cover.

8. The servo brushless motor with vibration reduction and noise reduction according to claim 1, characterized in that: The first housing includes an integrally formed main housing and an end cover, the end cover is arranged at one end of the main housing away from the second housing, the stator is mounted on the inner wall of the main housing, the first bearing is mounted on the inner wall of the end cover, and the end of the end cover covers the first bearing.

9. The servo brushless motor with vibration reduction and noise reduction according to claim 1, characterized in that: It also includes a magnetic encoder, which includes a magnetic wheel and a reading head that cooperate with each other. The magnetic wheel is fixedly installed on the rotating shaft, and the reading head is fixedly installed on the back cover.

10. A brushless servo motor with vibration reduction and noise reduction according to claim 9, characterized in that: The rear cover is provided with a positioning hole for positioning the magnetic encoder.

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