Outer rotor structure and permanent magnet motor
By designing a pressing device, the permanent magnet is housed below the inner wall of the outer rotor body, which solves the problem of collision between the stator and the permanent magnet, improves the stability and flexibility of installation, and extends the service life of the outer rotor.
Patent Information
- Application Number
- CN202521852793.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-08-29
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-08-29
AI Technical Summary
The existing external rotor has a fixed position of the permanent magnet inside, which causes the stator to be close to the permanent magnet during insertion, which may result in a collision, affecting the service life and normal operation of the external rotor.
A pressing device was designed, including components such as a ring, a push plate, a pressure plate, and a threaded cover. The permanent magnet is housed under the inner wall of the outer rotor body by the reaction force of the spring, avoiding collision between the stator and the permanent magnet. The installation stability and flexibility are improved by the threaded cover and anti-slip strips.
This effectively avoids collisions between the stator and the permanent magnet, improves the safety and assembly flexibility of the permanent magnet, and extends the service life of the outer rotor.
Smart Images
Figure CN224683966U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of external rotor technology, and in particular to an external rotor structure and a permanent magnet motor. Background Technology
[0002] A permanent magnet motor is a type of motor that uses the magnetic field generated by a permanent magnet to achieve energy conversion. It has advantages such as simple structure, high efficiency, small size, light weight, and long life. It is widely used in various fields, such as electric vehicles, home appliances, and industrial automation. A permanent magnet motor is usually composed of two parts: an outer rotor and an inner rotor. The outer rotor structure is an important component of a permanent magnet motor.
[0003] Most existing external rotors are ring-shaped or barrel-shaped, surrounding the stator and inlaid with permanent magnets. Under the influence of the stator's magnetic field, they rotate with the magnetic field and directly drive the external load. However, because the position of the permanent magnets inside the external rotor is fixed, the stator may be too close to the permanent magnets during the insertion process. This can cause the stator to collide with the permanent magnets when it tilts, resulting in local damage to the permanent magnets and affecting the normal use and service life of the external rotor. Utility Model Content
[0004] The technical problem to be solved by this utility model is that, since the position of the permanent magnet inside the outer rotor is fixed, the stator may be too close to the permanent magnet during the process of inserting it into the outer rotor. This may cause the stator to collide with the permanent magnet when it tilts, resulting in local damage to the permanent magnet and affecting the normal use and service life of the outer rotor.
[0005] The technical solution adopted by this utility model to solve its technical problem is: an outer rotor structure, including: an outer rotor body, the outer rotor body being disposed inside a permanent magnet motor, wherein a shaft seat is disposed inside the outer rotor body, wherein a stator is sleeved on the surface of the shaft seat, wherein the stator is disposed inside the outer rotor body; a pressing device, the pressing device being disposed on the outer rotor body, wherein the pressing device can completely retract the permanent magnet when the stator is inserted into the outer rotor body, so that the surface of the permanent magnet is lower than the inner wall of the outer rotor body, thereby avoiding collision between the stator and the permanent magnet.
[0006] Preferably, the pressing device includes: a ring, which is fixedly sleeved on the outer rotor body, wherein a first groove is formed on one side of the ring, and a second groove is formed on the inner wall of the outer rotor body, wherein the first groove and the second groove are connected through a circular hole, and a threaded groove is formed on one side of the ring; a push plate, wherein a circular rod is fixedly connected to one side of the push plate, wherein the surface of the circular rod is slidably connected to the inner wall of the circular hole inside the first groove, wherein the size and shape of the surface of the push plate are adapted to the size and shape of the inner wall of the first groove, wherein a spring is sleeved on the surface of the circular rod, wherein one end of the spring is fixedly connected to the push plate, and the other end is fixedly connected to the inner wall of the first groove; a pressure plate, which is fixedly connected to the circular rod, wherein the size and shape of the surface of the pressure plate are adapted to the size and shape of the inner wall of the second groove; a permanent magnet, which is fixedly glued to the side of the pressure plate away from the push plate; and a threaded cover, which is sleeved on the ring, wherein the inner wall of the threaded cover is threadedly connected to the threaded groove of the ring, and wherein the surface of the push plate near the threaded cover has a slope.
[0007] The effect achieved by the above components is as follows: By setting up a pressing device, firstly, under the reaction force of the spring, the spring pushes the push plate to move away from the outer rotor body. This causes the push plate, through the round rod, to drive the pressure plate and permanent magnet to move away from the shaft seat. The push plate then completely carries the permanent magnet into the second groove for storage, ensuring that the surface of the permanent magnet is lower than the inner wall of the outer rotor body. This ensures that when the stator tilts, it only contacts the inner wall of the outer rotor body, thus protecting the permanent magnet. When the stator is completely positioned inside the outer rotor body, manually rotating the threaded cover causes it to move along the annular surface towards the push plate during rotation. During its movement, the threaded cover pushes the push plate towards the inside of the first groove. This push plate, through the round rod, pushes the pressure plate towards the shaft seat, causing the pressure plate to push the permanent magnet out of the second groove and onto a position relatively close to the stator surface. This completes the pressing and fixing of the permanent magnet, reducing the close distance between the stator and the permanent magnet during the insertion of the stator into the outer rotor body. This reduces the risk of collision between the stator and the permanent magnet when the stator tilts, which could cause local damage to the permanent magnet and affect the normal use and service life of the outer rotor body. This improves the safety and assembly flexibility of the permanent magnet during stator installation.
[0008] Preferably, the surface of the threaded cover is fixed with a plurality of anti-slip strips, and the plurality of anti-slip strips are arranged at equal intervals.
[0009] The effect achieved by the above components is that by setting anti-slip strips, the friction between the hand and the surface of the threaded cover can be increased, reducing the chance of slipping when manually rotating the threaded cover.
[0010] Preferably, the side of the ring near the threaded groove is bonded with an adhesive bladder, wherein the adhesive bladder stores molten adhesive.
[0011] The effect achieved by the above-mentioned components is as follows: by setting up the glue bladder, when the threaded cover moves to the position where the inner wall is in contact with the surface of the ring, the threaded cover presses on the glue bladder and causes it to break, so that the glue inside the glue bladder flows out and seeps into the gap between the thread groove and the inner wall of the threaded cover to fill it. After the glue solidifies, it bonds and fixes the threaded cover, reduces the rotation of the threaded cover, and further improves the stability of the threaded cover.
[0012] Preferably, the threaded cover has a bevel on the side near the push plate, wherein the surface slope of the bevel matches the surface slope of the push plate.
[0013] The effect achieved by the above components is that by setting a bevel angle on the threaded cover, the bevel angle on the threaded cover can be adapted to the slope of the push plate surface, so that the two surfaces fit more closely when the threaded cover pushes the push plate, thereby increasing the smoothness of the threaded cover pushing the push plate.
[0014] Preferably, a limiting groove is formed on the inner wall of the first groove, and a limiting block is fixed to one side of the push plate, wherein the limiting block is placed inside the limiting groove to limit the push plate.
[0015] The effect achieved by the above components is as follows: by setting the limiting block and the limiting groove, the limiting block can slide inside the limiting groove and assist in limiting the push plate, reducing the situation of the push plate rotating or swaying left and right when subjected to force, and improving the stability of the push plate.
[0016] Preferably, the pressure plate has multiple reinforcing ribs inside, wherein the reinforcing ribs are made of titanium alloy.
[0017] The effect achieved by the above components is that by setting reinforcing ribs, the strength of the pressure plate can be increased, reducing the possibility of deformation or breakage of the pressure plate under stress, which would affect the stability and performance of the permanent magnet.
[0018] The beneficial effects of this utility model are:
[0019] By setting up a pressing device, the permanent magnet can be moved to a position lower than the inner wall of the outer rotor body, avoiding collisions caused by the permanent magnet protruding too much inside the outer rotor body. This reduces the possibility of collisions between the stator and the permanent magnet during installation, which could lead to local damage to the permanent magnet and affect the normal use and service life of the outer rotor body. This improves the safety of the permanent magnet during stator installation and the assembly flexibility of the permanent magnet. Attached Figure Description
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;
[0022] Figure 2 This utility model Figure 1 A schematic diagram of a partial three-dimensional structure;
[0023] Figure 3 This is a three-dimensional structural diagram of the permanent magnet of this utility model;
[0024] Figure 4 This is a three-dimensional structural diagram of the first groove of this utility model;
[0025] Figure 5 This is a three-dimensional structural diagram of the glue capsule of this utility model;
[0026] Figure 6 This is a three-dimensional structural diagram of the pressure plate of this utility model;
[0027] Figure 7 This is a three-dimensional structural diagram of the threaded cover of this utility model.
[0028] Legend: 1. Outer rotor body; 2. Shaft seat; 3. Stator; 4. Pressing device; 41. Ring; 42. First groove; 43. Second groove; 44. Limiting groove; 45. Push plate; 46. Pressure plate; 47. Permanent magnet; 48. Reinforcing rib; 49. Limiting block; 410. Threaded cover; 411. Slope; 412. Anti-slip strip; 413. Glue bag; 5. Permanent magnet motor. Detailed Implementation
[0029] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.
[0030] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0031] Figure 1-7The external rotor structure shown includes: an external rotor body 1, which is disposed inside a permanent magnet motor 5, wherein a bearing seat 2 is disposed inside the external rotor body 1, and a stator 3 is sleeved on the surface of the bearing seat 2, wherein the stator 3 is disposed inside the external rotor body 1; and a pressing device 4, which is disposed on the external rotor body 1, wherein the pressing device 4 can completely retract the permanent magnet 47 when the stator 3 is inserted into the external rotor body 1, so that the surface of the permanent magnet 47 is lower than the inner wall of the external rotor body 1, thereby preventing the stator 3 from colliding with it.
[0032] Figure 2-7The pressing device 4 shown includes: a ring 41, which is fixedly sleeved on the outer rotor body 1. A first groove 42 is formed on one side of the ring 41, and a second groove 43 is formed on the inner wall of the outer rotor body 1. The first groove 42 and the second groove 43 are connected through a circular hole. A threaded groove is formed on one side of the ring 41. A push plate 45 has a circular rod fixedly connected to one side. The surface of the circular rod is slidably connected to the inner wall of the circular hole inside the first groove 42. The size and shape of the push plate 45 are adapted to the size and shape of the inner wall of the first groove 42. A spring is sleeved on the surface of the circular rod, with one end of the spring fixedly connected to the push plate 45. One end is fixed to the inner wall of the first groove 42; a pressure plate 46 is fixed to the round rod, wherein the surface size and shape of the pressure plate 46 are adapted to the size and shape of the inner wall of the second groove 43; a permanent magnet 47 is fixed to the side of the pressure plate 46 away from the push plate 45 by adhesive; a threaded cover 410 is sleeved on the ring 41, wherein the inner wall of the threaded cover 410 is threadedly connected to the threaded groove of the ring 41, wherein the surface of the push plate 45 near the threaded cover 410 has a slope, and by setting the pressing device 4, firstly, under the reaction force of the spring, the spring pushes the push plate 45 to move away from the outer rotor body 1, so that The push plate 45, via the round rod, drives the pressure plate 46 and the permanent magnet 47 to move away from the shaft seat 2, so that the push plate 45 completely carries the permanent magnet 47 into the second groove 43 for storage, making the surface of the permanent magnet 47 lower than the inner wall of the outer rotor body 1, so that when the stator 3 tilts, it only contacts the inner wall of the outer rotor body 1, thus protecting the permanent magnet 47. When the stator 3 is completely placed inside the outer rotor body 1, the threaded cover 410 is manually rotated, so that the threaded cover 410 moves along the surface of the ring 41 towards the push plate 45 during rotation, so that the threaded cover 410 pushes the push plate 45 towards the first groove 42 during the movement. The direction of movement causes the push plate 45 to push the pressure plate 46 towards the shaft seat 2 via the round rod during the movement. This causes the pressure plate 46 to push the permanent magnet 47 out of the second groove 43 and push it to a position relatively close to the surface of the stator 3, thereby completing the pressing and fixing of the permanent magnet 47. This reduces the situation where the distance between the stator 3 and the permanent magnet 47 is too close during the insertion of the stator 3 into the outer rotor body 1, which could cause the stator 3 to collide with the permanent magnet 47 when tilting, resulting in local damage to the permanent magnet 47 and affecting the normal use and service life of the outer rotor body 1. This improves the safety of the permanent magnet 47 when installing the stator 3 and the assembly flexibility of the permanent magnet 47.
[0033] Figure 2-7Multiple anti-slip strips 412 are fixed to the surface of the threaded cover 410 shown. The multiple anti-slip strips 412 are arranged at equal intervals. By setting the anti-slip strips 412, the friction between the hand and the surface of the threaded cover 410 can be increased, reducing the possibility of slippage when manually rotating the threaded cover 410. A glue bladder 413 is glued to the side of the ring 41 near the thread groove. The glue bladder 413 stores molten glue. By setting the glue bladder 413, when the threaded cover 410 moves to the position where the inner wall is in contact with the surface of the ring 41, the threaded cover 410 presses on the glue bladder 413 and causes it to break. The glue inside the glue bladder 413 flows out and seeps into the gap between the thread groove and the inner wall of the threaded cover 410 to fill it. After the glue solidifies, it bonds and fixes the threaded cover 410, reducing the rotation of the threaded cover 410 and further improving the stability of the threaded cover 410.
[0034] Figure 2-7 The threaded cover 410 shown has a bevel angle 411 on the side near the push plate 45. The surface slope of the bevel angle 411 is adapted to the surface slope of the push plate 45. By setting the bevel angle 411 on the threaded cover 410, the bevel angle 411 on the threaded cover 410 can be adapted to the surface slope of the push plate 45, so that the surfaces of the two are more closely matched when the threaded cover 410 pushes the push plate 45, increasing the smoothness of the threaded cover 410 pushing the push plate 45. The inner wall of the first groove 42 has a limiting groove 44. A limiting block 49 is fixedly connected to one side of the push plate 45. The limiting block 49 is placed inside the limiting groove 44 to limit the push plate 45. By setting the limiting block 49 and the limiting groove 44, the limiting block 49 can slide inside the limiting groove 44 and provide auxiliary limiting for the push plate 45, reducing the situation of the push plate 45 rotating or swaying left and right when subjected to force, and improving the stability of the push plate 45.
[0035] Figure 2-7 The pressure plate 46 shown has multiple reinforcing ribs 48 inside, which are made of titanium alloy. By setting the reinforcing ribs 48, the strength of the pressure plate 46 can be increased, reducing the deformation or breakage of the pressure plate 46 under stress, which would affect the stability and effectiveness of the permanent magnet 47.
[0036] Working principle: First, under the reaction force of the spring, the spring pushes the push plate 45 to move away from the outer rotor body 1. The push plate 45, through the round rod, drives the pressure plate 46 and the permanent magnet 47 to move away from the shaft seat 2. This allows the push plate 45 to completely bring the permanent magnet 47 into the second groove 43 for storage, ensuring that the surface of the permanent magnet 47 is lower than the inner wall of the outer rotor body 1. This ensures that when the stator 3 tilts, it only contacts the inner wall of the outer rotor body 1, thus protecting the permanent magnet 47. When the stator 3 is completely placed inside the outer rotor body 1... When in position, manually rotate the threaded cover 410, causing it to move along the surface of the ring 41 towards the push plate 45 during rotation. This movement pushes the push plate 45 towards the interior of the first groove 42, which in turn pushes the pressure plate 46 towards the shaft seat 2 via the round rod. This causes the pressure plate 46 to push the permanent magnet 47 out of the second groove 43 and push it to a position relatively close to the surface of the stator 3, thereby completing the pressing and fixing of the permanent magnet 47.
[0037] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.
Claims
1. An external rotor structure, characterized in that it comprises: The outer rotor body (1) is located inside the permanent magnet motor (5). The outer rotor body (1) is provided with a bearing seat (2), and a stator (3) is sleeved on the surface of the bearing seat (2). The stator (3) is located inside the outer rotor body (1). The pressing device (4) is installed on the outer rotor body (1). The pressing device (4) can completely retract the permanent magnet (47) when the stator (3) is inserted into the outer rotor body (1), so that the surface of the permanent magnet (47) is lower than the inner wall of the outer rotor body (1) to avoid the stator (3) from colliding with it.
2. The external rotor structure according to claim 1, characterized in that: The pressing device (4) includes: a ring (41), which is fixedly sleeved on the outer rotor body (1), wherein a first groove (42) is provided on one side of the ring (41), and a second groove (43) is provided on the inner wall of the outer rotor body (1), wherein the first groove (42) and the second groove (43) are connected by a round hole, and a threaded groove is provided on one side of the ring (41); A push plate (45) is fixedly connected to a round rod on one side, wherein the surface of the round rod is slidably connected to the inner wall of the round hole inside the first groove (42), wherein the size and shape of the surface of the push plate (45) are adapted to the size and shape of the inner wall of the first groove (42), wherein a spring is sleeved on the surface of the round rod, wherein one end of the spring is fixedly connected to the push plate (45) and the other end is fixedly connected to the inner wall of the first groove (42); A pressure plate (46) is fixedly connected to a round rod, wherein the surface size and shape of the pressure plate (46) are adapted to the size and shape of the inner wall of the second groove (43).
3. The external rotor structure according to claim 2, characterized in that: The pressing device (4) also includes a permanent magnet (47), which is fixed to the side of the pressure plate (46) away from the push plate (45) by adhesive.
4. The external rotor structure according to claim 3, characterized in that: The pressing device (4) further includes a threaded cover (410), which is fitted on the ring (41). The inner wall of the threaded cover (410) is threadedly connected to the threaded groove of the ring (41). The push plate (45) has a slope on the side surface near the threaded cover (410).
5. An external rotor structure according to claim 4, characterized in that: The surface of the threaded cover (410) is fixed with a plurality of anti-slip strips (412), which are arranged at equal intervals.
6. An external rotor structure according to claim 4, characterized in that: The ring (41) has a glue sac (413) glued to the side near the threaded groove, wherein the glue sac (413) stores molten glue.
7. An external rotor structure according to claim 4, characterized in that: The threaded cover (410) has a bevel (411) on the side near the push plate (45), wherein the surface slope of the bevel (411) is adapted to the surface slope of the push plate (45).
8. An external rotor structure according to claim 4, characterized in that: The inner wall of the first groove (42) is provided with a limiting groove (44), and a limiting block (49) is fixedly connected to one side of the push plate (45), wherein the limiting block (49) is placed inside the limiting groove (44) to limit the push plate (45).
9. An external rotor structure according to claim 4, characterized in that: The pressure plate (46) has multiple reinforcing ribs (48) inside, and the reinforcing ribs (48) are made of titanium alloy.
10. Permanent magnet motor (5), characterized by: The external rotor structure according to any one of claims 1-9.