Waterproof structure of inner rotor brushless motor rotor assembly

Abstract

The utility model discloses a waterproof structure of inner rotor brushless motor rotor subassembly relates to motor design field, including motor shell, stator subassembly and rotor subassembly, and the middle part of stator subassembly is shaped with the rotation hole, and rotor subassembly rotation cooperation installs in the rotation hole, rotor subassembly includes pivot, fixed ring, permanent magnet ring and stainless steel cylinder, and permanent magnet ring clearance fit installs in stainless steel cylinder, and fixed ring is provided with two or more, and fixed ring sleeve joint installs on the pivot, and permanent magnet ring sleeve joint installation is wrapped two or more fixed ring setting, and the pivot, fixed ring, permanent magnet ring and stainless steel cylinder between through the paste fixed of glue, and the glue of paste rotor subassembly adopts epoxy heat conducting adhesive, and the glue of rotor subassembly is filled in the pivot, fixed ring, permanent magnet ring and stainless steel cylinder between, compared with prior art, the utility model discloses can select the magnet of greater magnetic force as permanent magnet ring, and through the stainless steel cylinder is shielded, and then guarantees the working efficiency of motor.

Description

Technical Field

[0001] This utility model relates to the field of motor design, and in particular to a waterproof structure for the rotor assembly of an internal rotor brushless motor. Background Technology

[0002] A brushless DC motor consists of a motor body and a driver, and is a typical mechatronic product. Because a brushless DC motor operates in a self-controlled manner, it does not require an additional starting winding on the rotor like a synchronous motor that starts under heavy load with frequency conversion speed regulation, nor does it experience oscillation or loss of synchronism during sudden load changes.

[0003] Currently, very few brushless motor internal rotor structures in the industry can achieve a waterproof structure. For example, an existing patent (publication number: WO2020010764A1, publication date: 2020.01.16) discloses a motor, power component, and drone, in which the motor uses an encapsulating layer to wrap the coil to achieve waterproof sealing. However, this solution does not improve the rotor structure of the motor. Currently, the motor generally operates by fixing a permanent magnet ring to the rotor. However, to ensure that the permanent magnet ring does not rust, the permanent magnet ring of conventional rotors uses ferrite magnets, which have the defect of weak magnetic force.

[0004] Due to the weak performance of magnets, the advantages of brushless motors are not obvious, and their torque is small, resulting in low motor efficiency. Therefore, it is necessary to design a waterproof structure for the rotor assembly of an internal rotor brushless motor to solve this technical problem. Utility Model Content

[0005] To overcome the shortcomings mentioned above, this utility model provides a technical solution that can solve the above problems.

[0006] A waterproof structure for an internal rotor brushless motor rotor assembly includes a motor housing, a stator assembly, and a rotor assembly. The stator assembly is installed in the motor housing by encapsulation with adhesive. A rotating hole is formed in the middle of the stator assembly, and the rotor assembly is rotatably fitted into the rotating hole. The rotor assembly includes a rotating shaft, a fixed ring, a permanent magnet ring, and a stainless steel cylinder. The permanent magnet ring is installed in the stainless steel cylinder with a clearance fit. There are two or more fixed rings, and the fixed rings are sleeved on the rotating shaft. The permanent magnet ring is sleeved on and covers the two or more fixed rings. The rotating shaft, fixed ring, permanent magnet ring, and stainless steel cylinder are bonded and fixed together with adhesive. The adhesive used to bond the rotor assembly is epoxy thermally conductive adhesive, and the adhesive of the rotor assembly is potted between the rotating shaft, fixed ring, permanent magnet ring, and stainless steel cylinder.

[0007] Furthermore: the adhesive used to pot the stator assembly is epoxy thermally conductive adhesive, and a copper wire winding is provided inside the stator assembly. The rotating hole is located in the middle of the copper wire winding. After the adhesive in the stator assembly dries, it seals the copper wire winding in the motor housing. The stainless steel cylinder is rotatably installed in the rotating hole of the stator assembly.

[0008] Furthermore: both ends of the motor housing are formed with bearing grooves, and rolling bearings are rotatably installed in the bearing grooves. The inner ring of the rolling bearing is sleeved on the rotating shaft, and the rotating shaft is rotatably installed in the rotating holes of the motor housing and the stator assembly through the rolling bearings on both sides.

[0009] Furthermore, the rotor assembly also includes two limiting rings, which are sleeved and fixedly installed on the rotating shaft, and the limiting rings abut against the inner ring of the rolling bearing.

[0010] Furthermore, the limiting ring is fixed to the rotating shaft by adhesive.

[0011] Furthermore, the permanent magnet ring is made of neodymium iron boron magnet.

[0012] Furthermore: the stainless steel cylinder is made of 316 stainless steel.

[0013] Compared with the prior art, the beneficial effects of this utility model are: by using epoxy thermally conductive adhesive to pot the rotor shaft, fixed ring, permanent magnet ring and stainless steel cylinder, the rotor assembly is fully sealed. Combined with the stator assembly potted with adhesive, the brushless motor can operate stably and is waterproof. Moreover, a stronger magnet can be selected as the permanent magnet ring, and the stainless steel cylinder can be used for shielding, which can effectively prevent corrosion and improve the motor torque, thus ensuring the motor's working efficiency.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a half-sectional structural diagram of the present invention; Figure 2 This is a schematic diagram of the rotor assembly; Figure 3 This is an exploded structural diagram of the rotor assembly.

[0017] The figure shows: 1. Motor housing; 2. Stator assembly; 3. Rotor assembly; 31. Shaft; 32. Fixed ring; 33. Permanent magnet ring; 34. Stainless steel cylinder; 35. Limiting ring; 4. Rotation hole; 5. Copper wire winding; 6. Bearing groove; 7. Rolling bearing. Detailed Implementation

[0018] The technical solution of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some embodiments of this utility model, but not all embodiments.

[0019] The components of the present invention embodiments described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0020] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0021] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] like Figure 1-3As shown, the present invention discloses a waterproof structure for an internal rotor brushless motor rotor assembly 3, comprising a motor housing 1, a stator assembly 2, and a rotor assembly 3. The stator assembly 2 is installed in the motor housing 1 by encapsulation with adhesive. A rotating hole 4 is formed in the middle of the stator assembly 2, and the rotor assembly 3 is rotatably fitted in the rotating hole 4. The rotor assembly 3 includes a rotating shaft 31, a fixed ring 32, a permanent magnet ring 33, and a stainless steel cylinder 34. The permanent magnet ring 33 is installed in the stainless steel cylinder 34 with a clearance fit. There are two or more fixed rings 32, and the fixed rings 32 are sleeved on the rotating shaft 31. The permanent magnet ring 33 is sleeved on and covers two or more fixed rings 32. The rotating shaft 31, fixing ring 32, permanent magnet ring 33 and stainless steel cylinder 34 are glued together. The glue used to glue the rotor assembly 3 is epoxy thermally conductive adhesive. The glue of the rotor assembly 3 is potted between the rotating shaft 31, fixing ring 32, permanent magnet ring 33 and stainless steel cylinder 34. The principle is as follows: by using epoxy thermally conductive adhesive to pot the rotor assembly 31, the fixed ring 32, the permanent magnet ring 33 and the stainless steel cylinder 34, the rotor assembly 3 is fully sealed. Combined with the stator assembly 2 potted with adhesive, the brushless motor can operate stably and is waterproof. Moreover, a stronger magnet can be selected as the permanent magnet ring 33 and wrapped and shielded by the stainless steel cylinder 34, which can effectively prevent corrosion and improve the torque of the motor, thus ensuring the working efficiency of the motor.

[0024] Furthermore: the adhesive used to pot the stator assembly 2 is epoxy thermally conductive adhesive. The stator assembly 2 is provided with a copper wire winding 5, and the rotating hole 4 is located in the middle of the copper wire winding 5. After the adhesive of the stator assembly 2 dries, it seals the copper wire winding 5 in the motor housing 1. The stainless steel cylinder 34 is rotatably installed in the rotating hole 4 of the stator assembly 2. This can fully seal the stator assembly 2 and achieve effective waterproofing. Even if water flows into the brushless motor, it will not cause damage to the brushless motor.

[0025] Furthermore, bearing grooves 6 are formed at both ends of the motor housing 1, and rolling bearings 7 are rotatably installed in the bearing grooves 6. The inner ring of the rolling bearing 7 is sleeved on the rotating shaft 31. The rotating shaft 31 is rotatably installed in the rotating holes 4 of the motor housing 1 and the stator assembly 2 through the rolling bearings 7 on both sides; this makes the fit of the rotor assembly 3 in the rotating holes 4 more stable and improves the working efficiency of the brushless motor.

[0026] Furthermore, the rotor assembly 3 also includes two limiting rings 35, which are sleeved and fixedly installed on the rotating shaft 31. The limiting rings 35 abut against the inner ring of the rolling bearing 7 in a corresponding manner; this can limit the installation position of the rolling bearing 7, achieve precise positioning and assembly, and ensure the stability of the rotation of the rotating shaft 31.

[0027] Furthermore, the limiting ring 35 is fixed to the rotating shaft 31 by adhesive; this makes the installation of the limiting ring 35 more stable and prevents it from loosening or shifting.

[0028] Furthermore, the permanent magnet ring 33 uses neodymium iron boron magnets, which have higher magnetic force. At the same time, it works in conjunction with the stainless steel cylinder 34 to achieve effective shielding, thereby ensuring that it will not rust and guaranteeing the working efficiency and service life of the brushless motor.

[0029] Furthermore, the stainless steel cylinder 34 is made of 316 stainless steel; it has excellent corrosion resistance, ensuring effective shielding of the permanent magnet ring 33, while its strength is higher, ensuring the working efficiency and service life of the brushless motor.

[0030] This embodiment does not impose any limitation on the shape, material, structure, etc. of this utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this utility model shall fall within the protection scope of this utility model.

Claims

1. A waterproof structure for a rotor assembly of an internal rotor brushless motor, comprising a motor housing, a stator assembly, and a rotor assembly, wherein the stator assembly is installed in the motor housing by encapsulation with adhesive, a rotating hole is formed in the center of the stator assembly, and the rotor assembly is rotatably fitted into the rotating hole; characterized in that: The rotor assembly includes a rotating shaft, a fixed ring, a permanent magnet ring, and a stainless steel cylinder. The permanent magnet ring is installed in the stainless steel cylinder with a clearance fit. There are two or more fixed rings, and the fixed rings are sleeved on the rotating shaft. The permanent magnet ring is sleeved on and covers the two or more fixed rings. The rotating shaft, fixed ring, permanent magnet ring, and stainless steel cylinder are bonded and fixed together with adhesive. The adhesive used to bond the rotor assembly is epoxy thermally conductive adhesive, and the adhesive of the rotor assembly is potted between the rotating shaft, fixed ring, permanent magnet ring, and stainless steel cylinder.

2. The waterproof structure of the rotor assembly of an internal rotor brushless motor according to claim 1, characterized in that: The adhesive used to pot the stator assembly is epoxy thermally conductive adhesive. The stator assembly has a copper wire winding inside, and the rotating hole is located in the middle of the copper wire winding. After the adhesive in the stator assembly dries, it seals the copper wire winding inside the motor housing. The stainless steel cylinder is rotatably fitted into the rotating hole of the stator assembly.

3. The waterproof structure of the rotor assembly of an internal rotor brushless motor according to claim 1, characterized in that: Both ends of the motor housing are formed with bearing grooves, and rolling bearings are rotatably installed in the bearing grooves. The inner ring of the rolling bearing is sleeved on the rotating shaft, and the rotating shaft is rotatably installed in the rotating holes of the motor housing and the stator assembly through the rolling bearings on both sides.

4. The waterproof structure of the rotor assembly of an internal rotor brushless motor according to claim 3, characterized in that: The rotor assembly also includes two limiting rings, which are sleeved and fixedly installed on the rotating shaft, and the limiting rings abut against the inner ring of the rolling bearing.

5. The waterproof structure of the rotor assembly of an internal rotor brushless motor according to claim 4, characterized in that: The limiting ring is fixed to the rotating shaft by adhesive.

6. The waterproof structure of the rotor assembly of an internal rotor brushless motor according to claim 1, characterized in that: The permanent magnet ring uses neodymium iron boron magnets.

7. The waterproof structure of the rotor assembly of an internal rotor brushless motor according to claim 1, characterized in that: The stainless steel cylinder is made of 316 stainless steel.

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