Brushless motor for locking driving of new energy vehicle transmission system

Abstract

The invention relates to the technical field of brushless motors, in particular to a brushless motor for locking driving of a transmission system of a new energy vehicle, which comprises a shell and a shell cover, the shell is clamped at the upper end of the shell cover, a rotor is rotatably connected to the inner middle part of the shell, and a permanent magnet is fixedly connected to the outer wall of the rotor in the shell. Pig iron is fixedly connected to the outer wall of the permanent magnet, an upper partition plate and a lower partition plate are arranged at the upper end and the lower end of the interior of the shell cover respectively, an upper spacer bush is fixedly connected to the end face of the side, close to the lower partition plate, of the upper partition plate, and a lower spacer bush is fixedly connected to the end face of the side, close to the upper partition plate, of the lower partition plate. Compared with the prior art, the problems that in the prior art, due to the fact that an E-park system in a new energy vehicle transmission system adopts a brush motor, the control precision requirement is high, the service life and performance are affected by carbon brush abrasion, cost and complexity are increased, and due to the fact that an additional locking structure is needed, the size and weight are increased, and reliability and stability are reduced are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless motors, and particularly to a brushless motor for locking and driving a transmission system of a new energy vehicle. Background Art

[0002] A brushless motor for locking and driving a transmission system of a new energy vehicle is a type of motor specifically designed for the transmission system of new energy vehicles. It adopts brushless DC motor technology and replaces the traditional mechanical commutator and carbon brushes with an electronic commutator, achieving higher operating efficiency and longer service life. This motor plays a key role in locking and driving the transmission system of new energy vehicles. It can quickly lock the transmission system when needed to ensure the stability and safety of vehicle driving. At the same time, it can provide strong power output to meet the power requirements of new energy vehicles under different working conditions. Its characteristics of high efficiency, reliability, and energy conservation are of great significance for improving the overall performance and driving experience of new energy vehicles.

[0003] In the transmission system of new energy vehicles, the E-park system plays a crucial role. Most traditional E-park systems use brushed motors. Although they can meet the basic locking and operating requirements, there are many deficiencies. For example, the control accuracy of brushed motors requires a higher controller system, and high-frequency operation will cause carbon brush wear, thus affecting the life and performance of the motor. In addition, to meet the requirements of ride experience for noise and electromagnetic compatibility (EMC), it is necessary to reduce the hardness of the carbon brush and increase the EMC suppression circuit structure, which further increases the cost and complexity. More importantly, when traditional brushed motors implement the locking function, they often require an additional independent locking structure, which not only increases the volume and weight of the system, but also raises the manufacturing cost. At the same time, these additional structures may also affect the reliability and stability of the system.

[0004] Furthermore, we disclose a brushless motor for locking and driving a transmission system of a new energy vehicle to meet the actual needs of the high control accuracy requirements, carbon brush wear affecting life and performance, increased cost and complexity brought by using brushed motors in the E-park system of the transmission system of new energy vehicles in the prior art, as well as the increased volume and weight and reduced reliability and stability caused by the need for additional locking structures. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to propose a brushless motor for locking and driving a transmission system of a new energy vehicle to solve the problems of high control accuracy requirements, carbon brush wear affecting life and performance, increased cost and complexity brought by using brushed motors in the E-park system of the transmission system of new energy vehicles in the prior art, as well as the increased volume and weight and reduced reliability and stability caused by the need for additional locking structures.

[0006] Based on the above-mentioned purpose, the present invention provides a brushless motor for locking drive of a new energy vehicle transmission system, including a shell and a shell cover, the shell is clamped at the upper end of the shell cover, the inner middle part of the shell is rotatably connected to a rotor, the outer wall of the rotor is located inside the shell and is fixedly connected to a permanent magnet, the outer wall of the permanent magnet is fixedly connected to pig iron, the upper and lower ends of the inner part of the shell cover are respectively provided with an upper partition and a lower partition, the end face of the upper partition close to the lower partition is fixedly connected to an upper spacer, the end face of the lower partition close to the upper partition is fixedly connected to a lower spacer, the outer sleeves of the upper spacer and the lower spacer are provided with multiple iron cores, the end faces of the upper spacer and the lower spacer away from the iron cores are fixedly connected to winding blocks, and the multiple winding blocks are fixedly connected to a connecting plate on the side close to the rotor, the connecting plate is arc-shaped, and the winding is wound on the outside of the winding block, and the connecting plates are distributed at equal angles inside the shell and there are notches between each connecting plate.

[0007] Preferably, bearings are sleeved on the upper and lower ends of the rotor, the two bearings are arranged at the connection with the housing, and the rotor is mounted on the housing through the bearings, the bearings are made of wear-resistant material, and there is a clearance fit between the bearings and the rotor.

[0008] Preferably, one side end surface of the upper partition plate and the lower partition plate are fixedly connected with a plurality of clamping blocks, and the upper partition plate and the lower partition plate are clamped and connected with the shell through the plurality of clamping blocks.

[0009] Preferably, a plurality of open slots are evenly spaced apart at the outer corners of the winding block, and the size of the open slots corresponds to the size of the winding.

[0010] Preferably, wiring ports are fixedly connected to both sides of the upper end of the outer wall of the shell, the ends of the winding are respectively connected to the wiring ports, and an insulating protective layer is provided at the connection between the wiring port and the winding.

[0011] Preferably, a shielding layer is provided outside the winding, and the shielding layer is used to reduce electromagnetic interference.

[0012] Preferably, a mounting ring is fixedly connected to the lower end of the shell, a plurality of connecting plates are evenly spaced and fixedly connected to the outer wall of the mounting ring, buffer plates are fixedly connected to both ends of the connecting plates, the buffer plates are inclined, and the buffer plates are made of elastic material.

[0013] Preferably, the layout of the windings on the winding block adopts a distributed arrangement, and adjacent windings are staggered at a certain angle in the circumferential direction.

[0014] Preferably, a lubricating oil groove is provided above the rotor, and the lubricating oil groove is communicated with the position of the bearing to provide lubrication for the bearing when the motor is running, thereby reducing friction and wear.

[0015] Preferably, a sealing ring is provided at the connection between the housing and the housing cover. The sealing ring is made of an elastic material and is used to prevent external impurities such as dust and moisture from entering the interior of the motor.

[0016] Advantages of the present invention:

[0017] 1. For the brushless motor used for locking and driving the transmission system of the new energy vehicle, the brushless motor cleverly utilizes the cogging torque characteristic. By adjusting the shape of the stator core slot opening and coordinating with the design of the magnetic ring and air gap, the transformation from a traditional single-function motor to a multi-function motor is realized. This design not only increases the cogging torque in the static state but also takes into account the control locking and control operation functions, thus greatly reducing the volume and complexity of the E-park system. In addition, the locking function can be achieved in the non-powered state by using the cogging torque characteristic. When the rotor of a traditional motor rotates, within a small range corresponding to the stator teeth on both sides of the permanent magnet, the magnetic conductance changes greatly, causing a change in the magnetic field energy storage, thereby generating cogging torque. This torque changes with the change of the rotor position and is a pulsating torque. The cogging torque is caused by the tangential component of the interaction force between the permanent magnet and the stator teeth. When the rotor of the motor rotates, the change in the magnetic conductance between the permanent magnet and the stator teeth leads to a change in the magnetic field energy storage, thereby generating a tendency to position the rotor at a certain position, that is, the position with the minimum magnetic resistance. Based on the above basic principle, different from the design of traditional brushless motors that try to reduce the cogging torque as much as possible, this brushless motor uses a special slot size design and a flat-top wave magnetization method for the rotor to achieve a stable and large cogging torque. The shape of the slot opening is specially designed to adapt to the interaction between the permanent magnet and the stator teeth, thereby optimizing the generation of cogging torque. This special design includes changing the width, depth or shape of the slot opening, such as using a trapezoidal, arc-shaped or other non-standard shapes to better match the magnetic field distribution of the permanent magnet to meet the requirement of realizing the locking function using its characteristics in the non-powered state, further improving the energy efficiency and safety of the system. This design concept of multi-function integration not only meets the current automotive industry's pursuit of high-level platformization and multi-functionality but also provides more possibilities for the development of future new energy vehicles.

[0018] 2. The brushless motor for locking drive of the new energy vehicle transmission system takes into account the requirements of lightweight, compactness, and high efficiency. The motor rotor adopts a lightweight design of integrally injection-molding the magnetic ring and the rotating shaft, which reduces the rotational inertia of the rotor and improves the response speed of the motor. At the same time, the motor stator effectively utilizes the space through the way of extended wiring pieces, further compressing the overall length. In terms of manufacturing process, the brushless motor adopts a structural design suitable for automated equipment, meeting the requirements of fully automated assembly and testing. This not only improves the assembly efficiency and product consistency but also reduces the manufacturing cost. The optimization of this structural design and manufacturing process not only meets the high requirements of new energy vehicles for the performance, volume, and weight of components but also makes contributions to the sustainable development of the automotive industry.

[0019] 3. The brushless motor for locking drive of the new energy vehicle transmission system uses a gear and bushing structure to change the interference fit of the traditional ball bearing into a sliding fit. This improvement reduces the force on the inner steel ring of the bearing, thus effectively reducing the noise generation during operation. At the same time, the motor rotor uses a lightweight design of integrally injection-molding the magnetic ring and the rotating shaft, which reduces the rotational inertia of the rotor and improves the response speed of the motor. This change also indirectly reduces the vibration and noise generated by rotation. In addition, by optimizing the winding process and welding method, the overall balance and stability of the motor are improved, further reducing the noise interference. Therefore, the brushless motor can maintain a low noise level during operation, providing a quieter and more comfortable experience for the driver and passengers, enhancing the user experience and market competitiveness of the product.

[0020] 4. The brushless motor for locking drive of the new energy vehicle transmission system is provided with a shock-absorbing component, which is composed of a mounting ring, a connecting piece, and a buffer piece. This is of great significance for the stable operation of the brushless motor. First of all, it significantly improves the seismic performance of the motor, enabling the motor to operate more stably when subjected to external shocks or vibrations, reducing the noise and wear caused by vibration, and extending the service life of the motor. Secondly, the shock-absorbing component also helps to improve the driving comfort and safety of the whole vehicle. In new energy vehicles, as a key component of the transmission system, the stability and reliability of the motor directly affect the driving quality of the vehicle and the riding experience of passengers. By reducing the vibration and noise of the motor, the shock-absorbing component provides a quieter and more comfortable driving environment for passengers. At the same time, it also helps to improve the overall performance of the vehicle, making new energy vehicles more competitive in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only those of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0022] Figure 1 Schematic diagram of the three-dimensional structure of the present invention;

[0023] Figure 2 Schematic diagram of the internal three-dimensional structure of the present invention;

[0024] Figure 3 Schematic diagram of the partial upward-looking three-dimensional structure of the present invention;

[0025] Figure 4 Schematic diagram of the sectional three-dimensional view of the internal structure of the present invention;

[0026] Figure 5 Schematic diagram of the partial three-dimensional structure of the present invention;

[0027] Figure 6 Schematic diagram of the partial top view of the structure of the present invention;

[0028] Figure 7 is Figure 5 the enlarged view of part A in

[0029] Figure 8 Schematic diagram of the three-dimensional structure of the mounting ring of the present invention

[0030] Figure 9 Schematic diagram of the magnetization method of the rotor magnetic ring of the present invention.

[0031] The marks in the figure are:

[0032] 1. Housing; 2. Shell cover; 3. Bearing; 4. Wiring port; 5. Winding; 6. Rotor; 7. Connecting plate; 8. Iron core; 9. Upper spacer; 10. Lower spacer; 11. Permanent magnet; 12. Pig iron; 13. Notch; 14. Open slot; 15. Mounting ring; 16. Connecting piece; 17. Buffer piece; 18. Upper partition; 19. Lower partition; 20. Winding block; 21. Block; 22. Lubricating oil groove. Detailed implementation manners

[0033] To make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with specific embodiments.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should have the ordinary meanings understood by those of ordinary skill in the field to which the present invention pertains. The "first", "second" and similar terms used in the present invention do not denote any order, quantity or importance, but are only used to distinguish different components. Words such as "comprising" or "including" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Upper", "lower", "left", "right", etc. are only used to represent relative position relationships, and when the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0035] As Figures 1 to 9 shown, the brushless motor for locking and driving the transmission system of new energy vehicles includes a housing 1 and a housing cover 2. The housing 1 is snap-connected to the upper end of the housing cover 2. A rotor 6 is rotatably connected to the middle part inside the housing 1. A permanent magnet 11 is fixedly connected to the outer wall of the rotor 6 inside the housing 1. A cast iron 12 is fixedly connected to the outer wall of the permanent magnet 11. Upper and lower partitions 18 and 19 are respectively arranged at the upper and lower ends inside the housing cover 2. An upper spacer sleeve 9 is fixedly connected to the end face of the upper partition 18 close to the lower partition 19. A lower spacer sleeve 10 is fixedly connected to the end face of the lower partition 19 close to the upper partition 18. A plurality of iron cores 8 are sleeved outside the upper spacer sleeve 9 and the lower spacer sleeve 10. Winding blocks 20 are fixedly connected to the end faces of the upper spacer sleeve 9 and the lower spacer sleeve 10 far from the iron cores 8. A connecting plate 7 is fixedly connected to one side of each of the plurality of winding blocks 20 close to the rotor 6. The connecting plate 7 is arc-shaped. Windings 5 are wound around the outside of the winding blocks 20. The connecting plates 7 are evenly distributed inside the housing 1 and there are notches 13 between the connecting plates 7.

[0036] This brushless motor integrates the functions of locking and driving, optimizes the structure of the traditional E-park system, reduces the volume and cost, and at the same time improves the efficiency and reliability of the system. It adopts DC brushless technology and has the characteristics of low noise, low energy consumption, high response speed, etc., and is very suitable for the parking brake system of new energy vehicles.

[0037] Furthermore, as Figures 1 to 9As shown, the upper and lower ends of the rotor 6 are sleeved with bearings 3, and the two bearings 3 are arranged at the connection with the housing 1, and the rotor 6 is installed on the housing 1 through the bearings 3, and the bearings 3 are made of wear-resistant material. There is a clearance fit between the bearings 3 and the rotor 6, and the end faces of one side of the upper partition 18 and the lower partition 19 are fixedly connected with a plurality of blocks 21, and the upper partition 18 and the lower partition 19 are connected to the housing 1 through a plurality of blocks 21. A plurality of open slots 14 are evenly spaced at the outer corners of the winding block 20, and the size of the open slots 14 corresponds to the size of the winding 5. The upper ends of the outer wall of the housing 1 are fixedly connected with wiring ports 4, and the ends of the winding 5 The parts are respectively connected with the wiring port 4, the connection between the wiring port 4 and the winding 5 is provided with an insulating protective layer, the outside of the winding 5 is provided with a shielding layer, the shielding layer is used to reduce electromagnetic interference, the layout of the winding 5 on the winding block 20 adopts a distributed design, that is, adjacent windings 5 ​​are staggered at a certain angle in the circumferential direction, a lubricating oil groove 22 is provided above the rotor 6, the lubricating oil groove 22 is communicated with the position of the bearing 3, and is used to provide lubrication for the bearing 3 when the motor is running, reducing friction and wear, and a sealing ring is provided at the connection between the housing 1 and the housing cover 2, and the sealing ring is made of elastic material to prevent external impurities such as dust and moisture from entering the interior of the motor;

[0038] The rotor 6, as the core rotating component in the structure, is installed on the housing 1 through the bearing 3. The bearing 3 is made of wear-resistant material to ensure the stability and durability of the rotor 6 during rotation. In the brushless motor, it is supported inside the stator through the bearing 3. The clearance fit between the bearing 3 and the rotor 6 reduces friction and wear and improves the operating efficiency of the motor. This clearance fit is also important in the brushless motor, which ensures the smooth rotation of the rotor 6 inside the stator. The upper partition 18 and the lower partition 19 are connected to the housing 1 through a plurality of clamping blocks 21, which play a role in fixing and supporting the internal components. In the brushless motor, a similar fixed structure is used to maintain the relative position of the stator and the rotor 6. The open groove 14 outside the winding block 20 is used to accommodate and fix the winding 5. The winding 5 is a key component in the brushless motor and is responsible for generating a magnetic field to drive the rotor 6 to rotate. In this paragraph, the winding 5 The layout adopts a distributed design, that is, adjacent windings 5 ​​are staggered at a certain angle in the circumferential direction. This design helps to optimize the distribution of the electromagnetic field and improve the performance of the motor. The wiring port 4 is used to connect the external power supply and the winding 5 to provide the required electrical energy for the motor. In the brushless motor, the wiring port 4 is also used to connect the controller and the motor to achieve the transmission and control of electrical energy. The setting of the insulating protection layer and the shielding layer is used to improve the safety and electromagnetic compatibility of the motor. The insulating protection layer prevents current leakage and short circuit, while the shielding layer is used to reduce electromagnetic interference and ensure the stable operation of the motor. Finally, the lubricating oil groove 22 is connected to the position of the bearing 3 to provide lubrication for the bearing 3, reduce friction and wear, and extend the service life of the motor. In the brushless motor, although the need for lubrication may not be as significant as that of the traditional motor, proper lubrication and maintenance are equally important to ensure the long-term stable operation of the motor.

[0039] During the operation of the motor, when the power is turned on, the current generates a magnetic field through the winding 5, which interacts with the permanent magnet 11 in the rotor 6, thereby generating a torque to drive the rotor 6 to rotate. The rotation of the rotor 6 is transmitted to the drive shaft through the gear box to achieve the locking or opening action. At the same time, the motor can provide a certain locking force even when it is not powered on by using its own cogging torque characteristics. This is because when the motor rotor 6 rotates to a certain position, the change in magnetic permeability between the permanent magnet 11 and the stator teeth causes a change in magnetic field energy storage, thereby generating a cogging torque that attempts to position the rotor 6 at this position. Through the specially designed notch 13 size and the flat-top wave magnetization method of the rotor 6, the motor can achieve a stable and large cogging torque to meet the requirements of the locking function.

[0040] The performance and structure of the motor are optimized. The interference fit of the traditional ball bearing 3 is changed to a sliding fit by utilizing the gear and sleeve structure, thereby reducing the stress on the steel ring inside the bearing 3, reducing the noise generated and increasing its life. During the process, the common end structure is reasonably designed, the winding process and welding method are optimized, and the production efficiency and product consistency are improved.

[0041] Furthermore, as Figure 8 shown, a mounting ring 15 is fixedly connected to the lower end of the housing 1. A plurality of connecting pieces 16 are fixedly connected to the outer wall of the mounting ring 15 at uniform intervals. Both ends of each connecting piece 16 are fixedly connected with a buffer piece 17. The buffer piece 17 is inclined and made of an elastic material.

[0042] In this brushless motor, the mounting ring 15, the connecting pieces 16 and the buffer pieces 17 constitute a shock-absorbing assembly. When the motor is running, especially when a new energy vehicle is starting, accelerating or braking, the motor will be subjected to greater impact force or vibration. At this time, the shock-absorbing assembly plays a key role. The impact force or vibration is first transmitted to the mounting ring 15, and then dispersed to each buffer piece 17 through the connecting pieces 16. Since the buffer piece 17 is designed to be inclined and made of an elastic material, it can effectively absorb and disperse the impact force or vibration energy, convert it into heat energy or other forms of energy and dissipate it, thereby reducing the damage to the motor itself and the surrounding structures.

[0043] Those of ordinary skill in the art should understand that: The discussion of any embodiment above is only exemplary and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples; Under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, which are not provided in detail for the sake of brevity.

[0044] The present invention aims to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A brushless motor for locking drive of a new energy vehicle transmission system, comprising a housing (1) and a housing cover (2), wherein the housing (1) is snap-connected to the upper end of the housing cover (2), and is characterized in that: The inner middle part of the shell (1) is rotatably connected to a rotor (6); the outer wall of the rotor (6) is located inside the shell (1) and is fixedly connected to a permanent magnet (11); the outer wall of the permanent magnet (11) is fixedly connected to pig iron (12); the upper and lower ends of the shell cover (2) are respectively provided with an upper partition (18) and a lower partition (19); the end surface of the upper partition (18) close to the lower partition (19) is fixedly connected to an upper spacer sleeve (9); the end surface of the lower partition (19) close to the upper partition (18) is fixedly connected to a lower spacer sleeve (12); 0), the outer sleeves of the upper spacer (9) and the lower spacer (10) are provided with a plurality of iron cores (8), the end faces of the upper spacer (9) and the lower spacer (10) on the side away from the iron cores (8) are fixedly connected to winding blocks (20), the sides of the plurality of winding blocks (20) close to the rotor (6) are fixedly connected to connecting plates (7), the connecting plates (7) are arc-shaped, the outer sides of the winding blocks (20) are wound with windings (5), the connecting plates (7) are distributed at equal angles inside the housing (1), and notches (13) are provided between the connecting plates (7).

2. The brushless motor for locking drive of a new energy vehicle transmission system according to claim 1 is characterized in that: The upper and lower ends of the rotor (6) are sleeved with bearings (3), the two bearings (3) are arranged at the connection with the housing (1), and the rotor (6) is mounted on the housing (1) via the bearings (3), the bearings (3) are made of wear-resistant material, and there is a clearance fit between the bearings (3) and the rotor (6).

3. The brushless motor for locking drive of a new energy vehicle transmission system according to claim 1 is characterized in that: One side end surface of the upper partition (18) and the lower partition (19) is fixedly connected to a plurality of clamping blocks (21), and the upper partition (18) and the lower partition (19) are clamped and connected to the shell (1) via the plurality of clamping blocks (21).

4. The brushless motor for locking drive of a new energy vehicle transmission system according to claim 1 is characterized in that: A plurality of open slots (14) are evenly spaced apart at the outer corners of the winding block (20), and the size of the open slots (14) corresponds to the size of the winding (5).

5. The brushless motor for locking drive of a new energy vehicle transmission system according to claim 1, characterized in that: Wiring ports (4) are fixedly connected to both sides of the upper end of the outer wall of the shell (1), the ends of the winding (5) are respectively connected to the wiring ports (4), and an insulating protective layer is provided at the connection between the wiring port (4) and the winding (5).

6. The brushless motor for locking drive of a new energy vehicle transmission system according to claim 1, characterized in that: A shielding layer is provided outside the winding (5), and the shielding layer is used to reduce electromagnetic interference.

7. The brushless motor for locking drive of a new energy vehicle transmission system according to claim 1, characterized in that: The lower end of the shell (1) is fixedly connected to a mounting ring (15), the outer wall of the mounting ring (15) is evenly spaced and fixedly connected to a plurality of connecting pieces (16), both ends of the connecting pieces (16) are fixedly connected to buffer pieces (17), the buffer pieces (17) are arranged obliquely, and the buffer pieces (17) are made of elastic material.

8. The brushless motor for locking drive of a new energy vehicle transmission system according to claim 1, characterized in that: The layout of the windings (5) on the winding block (20) adopts a distributed arrangement, and adjacent windings (5) are staggered at a certain angle in the circumferential direction.

9. The brushless motor for locking drive of a new energy vehicle transmission system according to claim 1, characterized in that: A lubricating oil groove (22) is provided above the rotor (6), and the lubricating oil groove (22) is connected to the position of the bearing (3) and is used to provide lubrication for the bearing (3) when the motor is running, thereby reducing friction and wear.

10. The brushless motor for locking drive of a new energy vehicle transmission system according to claim 1, characterized in that: A sealing ring is provided at the connection between the housing (1) and the housing cover (2); the sealing ring is made of elastic material and is used to prevent external impurities such as dust and moisture from entering the interior of the motor.

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