Outer rotor brushless motor for automotive

Abstract

An outer rotor brushless motor for an automotive, comprising a housing assembly, a rotor assembly, and a stator assembly. The housing assembly comprises a housing, a motor shaft bearing, and an end cover; a bearing chamber is provided at a closed end of the housing; the motor shaft bearing is fixed in the bearing chamber; an open end of the housing is fixed to the end cover; the end cover is provided with the bearing chamber; the motor shaft bearing is fixed in the bearing chamber provided in the end cover; the rotor assembly comprises a motor shaft, a rotor housing, and a rotor permanent magnet; the rotor permanent magnet is fixed in the rotor housing; the rotor housing is fixed on the motor shaft; two ends of the motor shaft are respectively rollingly supported by the motor shaft bearing provided in the closed end of the housing and the motor shaft bearing provided in the end cover; the stator assembly comprises a hollow shaft, a stator bearing, a stator lamination component, a PCB module, and a fixing ring; and the hollow shaft is fixed in a hollow shaft fixing hole formed in the end cover. The outer rotor brushless motor for an automotive can ensure the reliability of the operation of the motor, and meet the waterproof and dustproof requirements of an automotive on the automotive motor.

Description

A type of automotive external rotor brushless motor Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a brushless external rotor motor for automobiles. Background Technology

[0002] With the continuous improvement of automotive automation, motors are being used more and more widely in automobiles. Currently, most of the motors used in vehicles, such as tailgate motors, side door motors, window lift motors, sunroof motors, fan motors, charging (fueling) door motors, electric water pump motors, and air pump motors, still use DC brushed motors. These motors generally have the drawbacks of short service life and EMC electromagnetic interference that can affect other electronic devices or control systems in the vehicle. Although brushless motors are also used, their internal rotor structure results in a smaller moment of inertia, leading to a lower power density. While they can be used for position control in control systems, motors used in automobiles for power transmission may experience problems such as unstable speed and vibration.

[0003] The motor rotor assembly has an external rotor structure, which can increase the rotation radius of the rotor assembly, increase the moment of inertia, and improve the power density of the motor. As a power transmission motor, it can make its operation more stable.

[0004] However, existing external rotor brushless motors use the rotor housing directly as the motor housing, resulting in poor sealing performance and poor protection against foreign objects and liquids. Therefore, they are not suitable for use in vehicles. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned defects of the prior art and provide an external rotor brushless motor for automobiles, which has good sealing performance and good resistance to foreign objects and liquids.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A brushless external rotor motor for automobiles includes a housing assembly, a rotor assembly, and a stator assembly. The housing assembly includes a housing, a motor shaft bearing, and an end cover. A bearing chamber is provided at the closed end of the housing, and the motor shaft bearing is fixed in the bearing chamber. The open end of the housing is fixed to the end cover, and a bearing chamber is provided at the end cover. The motor shaft bearing is fixed in the bearing chamber provided in the end cover. The rotor assembly includes a motor shaft, a rotor housing, and a rotor permanent magnet. The rotor permanent magnet is fixed inside the rotor housing, and the rotor housing is fixed to the motor shaft. The two ends of the motor shaft are respectively supported by the motor shaft bearing in the closed end of the housing and the motor shaft bearing in the end cover. The stator assembly includes a hollow shaft, a stator bearing, a stator lamination assembly, a PCB circuit board module, and a retaining ring. The hollow shaft is fixed in a hollow shaft retaining hole provided in the end cover.

[0008] Better still, the fixing ring is fixed in the fixing hole of the fixing ring provided in the end cover, the PCB circuit board module is fixed on the ring opening of the fixing ring, the end cover is provided with a wire harness opening and the wire outlet sleeve is put on the wire harness opening, the PCB circuit board module, the fixing ring, the end cover and the wire outlet sleeve form a roughly closed space, which can effectively prevent foreign objects or liquids from entering the motor and causing the motor to malfunction or fail.

[0009] Even better, a sealing ring I is provided between the end cap and the housing, which provides a better seal and can effectively prevent foreign objects or liquids from entering the motor and causing abnormalities or failures in the motor.

[0010] Even better, a sealing ring II is provided on the outside of the end cover. When the motor end cover is connected to external components, it can still effectively seal the motor and effectively prevent foreign objects or liquids from entering the motor and causing abnormalities or failures.

[0011] Even better, the hollow shaft fixing hole is long enough to effectively support the hollow shaft.

[0012] Even better, the distance between the axial center of the stator lamination component and the axial center of the rotor permanent magnet of the rotor assembly is L=0.5~1.5mm. A shim chamber is provided on the outer side of the bearing chamber, and the shim is fixed in the shim chamber. The motor shaft rests on the shim. In this way, when the motor is working, the motor shaft and its rotor assembly will be subjected to a magnetic pull along the axial direction to the left, so that the left end of the motor shaft is tightly attached to the end face of the shim, preventing axial movement of the rotor assembly and having the function of vibration reduction and noise reduction.

[0013] Even better, the gasket is made of elastic and wear-resistant material, which can improve the vibration reduction and noise reduction effect during motor operation.

[0014] Even better, the gasket has symmetrically arranged flat surfaces on both sides, and the lubricant is stored in the space formed by the flat surfaces and the gasket chamber, which can further extend the service life of the motor.

[0015] Even better, a cover is provided, which is fixed to the end cover, to effectively prevent foreign objects or liquids from entering the motor and causing abnormalities or failures.

[0016] Compared with the prior art, the advantages of the present invention are: by setting the housing and end caps, the rotor assembly and stator assembly are sealed in the housing, which can better prevent foreign objects and liquids from entering the motor and causing abnormalities or failures, ensuring the reliability of the motor operation and meeting the waterproof and dustproof requirements of automobiles for vehicle motors. Attached Figure Description

[0017] Figure 1 is a schematic diagram of the structure of an external rotor brushless motor according to an embodiment of the present invention.

[0018] Figure 2 is an exploded view of an external rotor brushless motor according to an embodiment of the present invention.

[0019] Figure 3 is a schematic diagram of the gasket of an external rotor brushless motor according to an embodiment of the present invention.

[0020] Figure 4 is a schematic diagram of the rotor housing of an external rotor brushless motor according to an embodiment of the present invention.

[0021] Figure 5 is a schematic diagram of a PCB circuit board module of an external rotor brushless motor according to an embodiment of the present invention.

[0022] Figure 6 is a schematic diagram of the fixing ring of an external rotor brushless motor according to an embodiment of the present invention.

[0023] Figure 7 is a schematic diagram of the end cover of an external rotor brushless motor according to an embodiment of the present invention.

[0024] Figure 8 is a schematic diagram of the cover of an external rotor brushless motor according to an embodiment of the present invention.

[0025] Explanation of the numbering in the diagram: 1. Housing assembly; 101. Housing; 1011. End face; 1012. Inner circular surface; 1013. Bearing housing; 1014. Shim housing; 102. Cylindrical bearing; 103. Shim; 1031. Outer circular surface; 1032. End face; 1033. Flat surface; 2. Rotor assembly; 201. Motor shaft; 2011. Outer circular surface; 2012. Ball head surface; 202. Rotor housing; 2021. Inner circular surface; 2022. 1. Outer circular surface; 2023. Shaft hole; 203. Rotor permanent magnet; 2031. Inner circular surface; 2032. Outer circular surface; 3. Stator assembly; 301. Hollow shaft; 3011. Inner circular surface; 3012. Outer circular surface; 302. Stator lamination assembly; 3021. Inner circular surface; 3022. Outer circular surface; 303. Stator winding; 3031. Wire end; 304. PCB circuit board module; 3041. Upper end face; 3042. Enamelled wire hole; 3 043. Power cord hole; 3044. Control cord hole; 3045. Positioning groove; 305. Retaining ring; 3051. Fixing hole; 3052. Positioning surface; 3053. Positioning boss; 3054. Wire harness opening; 3055. Annular positioning surface; 3056. Outer circular surface; 306. Sealing ring I; 307. End cap; 3071. Annular groove; 3072. Upper end face; 3073. Inner circular surface; 3074. Inner circular surface; 3075. Bearing 3076, Annular groove; 3077, Lower end face; 3078, Fixing hole; 3079, Fixing hole; 30710, Outer circular surface; 30711, Wire harness opening; 30712, Fixing surface; 308, Sealing ring II; 309, Machine cover; 3091, Positioning surface; 3092, Outer circular surface; 310, Cylindrical bearing; 311, Wire harness; 3111, Power cord; 3112, Control cord; 312, Outlet sleeve; 313, Fixing screw. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0027] As shown in Figures 1-8, a vehicle-mounted protective external rotor brushless motor includes a housing assembly 1, a rotor assembly 2, and a stator assembly 3.

[0028] The housing assembly 1 includes a housing 101, a cylindrical bearing 102, a gasket 103, and an end cap 307.

[0029] A cylindrical bearing 102 is provided at the center of the left end of the housing assembly 1, and a cylindrical bearing 310 is provided at the center of the right end of the stator assembly 3. These bearings cooperate with the two ends of the motor shaft 201 provided in the rotor assembly 2 to support the motor shaft 201. The rotor assembly 2 can rotate in the circumferential direction.

[0030] The housing 101 is closed at one end and open at the other end.

[0031] The housing 101 is provided with a bearing chamber 1013 at its closed end, and the cylindrical bearing 102 is fixed in the bearing chamber 1013 of the housing 101 by an interference fit.

[0032] A gasket chamber 1014 is provided on the outside of the bearing chamber 1013 at the closed end of the housing 101, and the gasket 103 is fixed in the gasket chamber 1014 of the housing 101 by interference fit.

[0033] The gasket 103 is made of elastic and wear-resistant material. During the operation of the motor, the left end of the motor shaft 201 rests on the gasket 103, which improves the vibration reduction and noise reduction effect of the gasket 103.

[0034] The gasket 103 has flat surfaces 1033 on both sides, forming a space between the flat surfaces 1033 and the gasket chamber 1014. The space can store grease and can provide grease to lubricate the cylindrical bearing 102 and the motor shaft 201 at any time, so that the cylindrical bearing 102 and the motor shaft 201 can maintain optimal operation, thereby extending the service life of the motor.

[0035] The open end of the housing 101 is mounted on the end cover 307. Specifically, the inner circular surface 1012 of the housing 101 and the outer circular surface 30710 of the end cover 307 are fixed together by an interference fit. The end face 1011 of the housing 101 and the fixing surface 30712 of the end cover 307 are fitted together to axially position the housing 101, and the housing 101 is fixed to the end cover 307 by fixing screws 313.

[0036] The end cap 307 is also provided with a hollow shaft fixing hole 3079. One end of the hollow shaft 301 is provided with an outer circular surface 3012 that is interference-fitted into the hollow shaft fixing hole 3079, which can ensure the coaxiality of the housing assembly 1 and the stator assembly 3 after assembly.

[0037] The hollow shaft fixing hole 3079 has a relatively long length, which can effectively support the hollow shaft 301.

[0038] The rotor assembly 2 is placed inside the cavity of the housing 101.

[0039] The rotor assembly 2 includes a motor shaft 201, a rotor housing 202, and a rotor permanent magnet 203.

[0040] The rotor permanent magnet 203 is provided with an outer circular surface 2032, and the rotor housing 202 is provided with a corresponding inner circular surface 2021. The rotor permanent magnet 203 is fixed in the rotor housing 202 with an interference fit.

[0041] The rotor housing 202 is provided with a shaft hole 2023 that is interference-fitted with the motor shaft 201, and is fixed on the motor shaft 201.

[0042] The stator assembly 3 includes a hollow shaft 301, a stator lamination component 302, a stator winding 303, a PCB circuit board module 304, a retaining ring 305, a sealing ring I 306, an end cover 307, a sealing ring II 308, a cover 309, a cylindrical bearing 310, a wire harness 311, a wire outlet sleeve 312, and a fixing screw 313.

[0043] The cylindrical bearing 310 is fixed in the bearing chamber 3075 provided in the end cover 307 by an interference fit.

[0044] The fixing ring 305 is fixed to the end cover 307 by an interference fit between its outer circular surface 3056 and the fixing hole 3078 of the end cover 307, and is axially positioned by the cooperation between the annular positioning surface 3055 of the fixing ring 305 and the lower end surface 3077 of the end cover 307.

[0045] A sealing ring I306 is provided between the housing 101 and the end cover 307. Specifically, the sealing ring I306 is installed in the annular groove I3076 provided at the front of the end cover 307, so that the sealing performance between the end cover 307 and the housing 101 is good.

[0046] The sealing ring II308 is installed in the annular groove II3071 provided at the rear of the end cover 307, which improves the sealing performance between the end cover 307 and the motor mounting position.

[0047] The stator lamination component 302 is provided with an inner circular surface 3021 and an outer circular surface 3012 provided with a hollow shaft 301, which are fixed to the hollow shaft 301 by an interference fit.

[0048] The stator winding 303 is wound inside the stator lamination component 302, and the multiple wire ends 3031 of the stator winding 303 are respectively soldered into the multiple enameled wire holes 3042 provided in the PCB circuit board module 304.

[0049] The multiple power lines 3111 and control lines 3112 of the wiring harness 311 are respectively soldered into multiple power line holes 3043 and control line holes 3044 provided in the PCB circuit board module 304.

[0050] The PCB circuit board module 304 is fixed in the fixing ring 305 by an interference fit with the fixing hole 3051 provided in the fixing ring 305, and is axially positioned by the positioning surface 3052 provided in the fixing ring 305.

[0051] Multiple positioning slots 3045 are also provided on the PCB circuit board module 304 to cooperate with multiple positioning bosses 3053 provided on the fixing ring 305 to prevent the PCB circuit board module 304 from rotating, making its fixation more reliable. This also prevents the power lines 3111 and control lines 3112 of the stator winding 303 wire ends 3031 and wire harness 311 soldered on it from becoming loose, which could lead to abnormalities or failures in the motor, thus ensuring the reliability of the motor's operation.

[0052] The wire harness 311 passes sequentially through the wire harness opening 3054 provided in the fixing ring 305 and the wire harness opening 30711 provided in the end cap 307, and then is led out from the wire outlet sleeve 312 fixed in the wire harness opening 30711 of the end cap 307.

[0053] The cable outlet sleeve 312 is installed inside the cable tie 30711.

[0054] The PCB circuit board module 304, the fixing ring 305, the wire outlet sleeve 312, and the end cover 307 form a closed space, which can play a role in waterproofing and dustproofing.

[0055] The outer circular surface 3092 of the cover 309 and the inner circular surface 3074 of the end cover 307 are fixed to the end cover 307 by an interference fit. The positioning surface 3091 of the cover 309 and the upper end surface 3072 of the end cover 307 are matched for axial positioning.

[0056] An air gap is formed between the inner circular surface 2031 of the rotor permanent magnet 203 of the rotor assembly 2 and the inner circular surface 3021 of the stator lamination component 302 of the stator assembly 3. The motor shaft 201 of the rotor assembly 2 forms gaps between the inner circular surface 3011 of the hollow shaft 301 of the stator assembly 3 and the inner circular surface 3073 of the end cover 307, so that the rotor assembly 2 can rotate smoothly and ensure the normal operation of the motor.

[0057] The axial center line E of the stator lamination component 302 of the stator assembly 3 and the axial center line N of the rotor permanent magnet 203 of the rotor assembly 2 are spaced apart by a distance L = 0.5~1.5mm. During the operation of the motor, the rotor assembly 2 is subjected to a magnetic pull force to the left along the axial direction, which makes the ball head surface 2012 of the motor shaft 201 tightly adhere to the end face 1032 of the shim 103, preventing axial movement of the rotor assembly 2 and providing vibration reduction and noise reduction functions.

[0058] The sealing ring I 306, in conjunction with the inner circular surface 1012 of the housing 101, provides waterproof and dustproof functionality. After the motor is connected to the mechanism, the sealing ring II 308, in conjunction with the inner circular surface of the housing of the external connector, also provides waterproof and dustproof functionality. The wire outlet sleeve 312, in conjunction with the wire harness opening 30711 of the end cover 307, also provides waterproof and dustproof functionality, effectively preventing foreign objects or liquids from entering the motor and causing abnormalities or failures, thus ensuring the reliability of the motor's operation.

[0059] It should be noted that the directional words such as inside, outside, left, right, up, and down, and words containing these directional words, used in this embodiment and in this application document are used only for the convenience of explanation. They are only for specific directions determined in the description and do not constitute a limitation on the content and scope of protection of this invention.

Claims

1. A brushless external rotor motor for automobiles, comprising a housing assembly, a rotor assembly, and a stator assembly. The housing assembly includes a housing, a motor shaft bearing, and an end cover. A bearing chamber is provided at the closed end of the housing, and the motor shaft bearing is fixed in the bearing chamber. The open end of the housing is fixed to the end cover, and the end cover provides a bearing chamber. The motor shaft bearing is fixed in the bearing chamber provided in the end cover. The rotor assembly includes a motor shaft, a rotor housing, and a rotor permanent magnet. The rotor permanent magnet is fixed inside the rotor housing, and the rotor housing is fixed on the motor shaft. The two ends of the motor shaft are respectively supported by a motor shaft bearing in the closed end of the housing and a motor shaft bearing in the end cover. The stator assembly includes a hollow shaft, a stator bearing, a stator lamination assembly, a PCB circuit board module, and a retaining ring. The hollow shaft is fixed in a hollow shaft retaining hole provided in the end cover.

2. The automotive external rotor brushless motor as described in claim 1, characterized in that: The fixing ring is fixed in the fixing hole of the fixing ring provided on the end cover, the PCB circuit board module is fixed on the ring opening of the fixing ring, the end cover is provided with a wire harness opening and the wire outlet sleeve is put on the wire harness opening, and the PCB circuit board module, fixing ring, end cover and wire outlet sleeve form a roughly closed space.

3. The automotive external rotor brushless motor as described in claim 1, characterized in that: A sealing ring I is provided between the end cap and the housing.

4. The automotive external rotor brushless motor as described in claim 1, characterized in that: A sealing ring II is provided on the outside of the end cap.

5. The automotive external rotor brushless motor as described in claim 1, characterized in that: The length of the hollow shaft fixing hole is sufficiently long.

6. The automotive external rotor brushless motor as described in claim 6, characterized in that: The distance between the axial center of the stator lamination component and the axial center of the rotor permanent magnet of the rotor assembly is L=0.5~1.5mm. A shim chamber is provided on the outer side of the bearing chamber, the shim is fixed in the shim chamber, and the motor shaft rests on the shim.

7. The automotive external rotor brushless motor as described in claim 6, characterized in that: The gasket is made of an elastic and wear-resistant material.

8. The automotive external rotor brushless motor as described in claim 6, characterized in that: The gasket has symmetrically arranged flat surfaces on both sides, and lubricant is stored in the space formed by the flat surfaces and the gasket chamber.

9. The automotive external rotor brushless motor as described in claim 1, characterized in that: A cover is also provided, which is fixed to the end cover.

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