Motor permanent magnet anti-drop structure and motor
By employing a limiting structure in the drone motor where the top and bottom of the magnet are respectively engaged with the upper pressure ring and the rotor disc, combined with an adhesive layer, the problem of easy magnet detachment in the drone motor is solved, achieving stable fixation under high speed and strong vibration environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-19
- Publication Date
- 2026-03-27
AI Technical Summary
The permanent magnets of drone motors are prone to aging and cracking under high temperature or long-term vibration, resulting in uneven adhesive layer. This makes it impossible to simultaneously meet the requirements of resisting centrifugal force at high speed and resisting displacement in a vibration environment, causing the magnets to easily fall off.
The magnet is fixed in place by using a method in which the top and bottom ends of the magnet are respectively engaged with the upper pressure ring and the rotor disc through the first and second slots, combined with an adhesive layer.
The stability of the magnets has been improved, making them suitable for high-speed and high-vibration drone power systems. This has solved the problem of magnets easily falling off, shortened assembly time, and improved mechanical locking strength.
Smart Images
Figure CN224053970U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to unmanned aerial vehicle motor technical field especially is related to a motor permanent magnet anti -drop structure and motor. BACKGROUND
[0002] Multi-rotor unmanned aerial vehicle is a special unmanned helicopter with three and above rotor axes. It drives the rotor through the rotation of the electric motor on each axis to generate lift and thrust. The total pitch of the rotor is fixed, unlike the general helicopter that is variable. By changing the relative rotation speed between different rotors, the size of single-axis propulsion can be changed to control the running track of the aircraft.
[0003] At present, the fixing of the permanent magnet of the unmanned aerial vehicle motor generally adopts a pure adhesive fixing mode, such as epoxy resin adhesive. However, the following problems exist: firstly, the adhesive layer is prone to aging and cracking under high temperature (> 80 DEG C) or long-term vibration; secondly, the amount of adhesive needs to be precisely controlled during assembly, and the process consistency is poor (tolerance ± 0.1 mm leads to uneven air gap). Moreover, the existing pure adhesive fixing mode cannot simultaneously satisfy the anti-centrifugal force effect under high speed and the anti-displacement effect in the vibration environment, so that the motor magnet is easy to fall off. SUMMARY
[0004] The utility model discloses a motor permanent magnet anti -drop structure and motor to solve the problem that the motor magnet of unmanned aerial vehicle is easy to fall off in prior art, and the motor permanent magnet anti -drop structure of the utility model can realize the location of the magnetic steel, so that the fixing of the magnetic steel is more stable and reliable, and is suitable for high-speed, strong-vibration unmanned aerial vehicle power system.
[0005] The utility model provides a motor permanent magnet anti -drop structure, including magnetic steel, upper compression ring and rotor disc, the top of magnetic steel is provided with first clamping groove, is provided with the first clamping portion of first clamping groove's adaptation on upper compression ring, the bottom of magnetic steel is provided with second clamping groove, the top of rotor disc is provided with the second clamping portion of second clamping groove's adaptation, upper compression ring and rotor disc are clamped respectively in the top and bottom of magnetic steel.
[0006] As a preferred scheme of the utility model, the upper compression ring includes a flat plate portion, the first clamping portion is a downward protruding portion relative to the flat plate portion, the downward protruding portion is connected to the inner side of the flat plate portion, and the downward protruding portion is clamped in the first clamping groove at the top of the magnetic steel.
[0007] As an optimal scheme of the utility model, the top end of the magnetic steel is provided with a top protruding part protruding upwards relative to the top surface thereof, the top protruding part is arranged on the outer ring of the magnetic steel, the first clamping groove is formed between the inner side of the top protruding part and the top surface of the magnetic steel, the outer side surface of the first clamping part is attached to the inner side surface of the top protruding part, and the flat plate part is attached to the protruding end surface of the top protruding part.
[0008] As an optimal scheme of the utility model, the top end of the magnetic steel is provided with a top protruding part protruding upwards relative to the top surface thereof, the top protruding part is arranged on the outer ring of the magnetic steel, the first clamping groove is formed between the inner side of the top protruding part and the top surface of the magnetic steel, the outer side surface of the first clamping part is attached to the inner side surface of the top protruding part, and the flat plate part is attached to the protruding end surface of the top protruding part.
[0009] As an optimal scheme of the utility model, the top end of the magnetic steel is provided with a top protruding part protruding upwards relative to the top surface thereof, the top protruding part is arranged on the outer ring of the magnetic steel, the first clamping groove is formed between the inner side of the top protruding part and the top surface of the magnetic steel, the outer side surface of the first clamping part is attached to the inner side surface of the top protruding part, and the flat plate part is attached to the protruding end surface of the top protruding part.
[0010] As an optimal scheme of the utility model, the top end of the magnetic steel is provided with a top protruding part protruding upwards relative to the top surface thereof, the top protruding part is arranged on the outer ring of the magnetic steel, the first clamping groove is formed between the inner side of the top protruding part and the top surface of the magnetic steel, the outer side surface of the first clamping part is attached to the inner side surface of the top protruding part, and the flat plate part is attached to the protruding end surface of the top protruding part.
[0011] As an optimal scheme of the utility model, the top end of the magnetic steel is provided with a top protruding part protruding upwards relative to the top surface thereof, the top protruding part is arranged on the outer ring of the magnetic steel, the first clamping groove is formed between the inner side of the top protruding part and the top surface of the magnetic steel, the outer side surface of the first clamping part is attached to the inner side surface of the top protruding part, and the flat plate part is attached to the protruding end surface of the top protruding part.
[0012] The utility model also provides a kind of motor, including the motor permanent magnet anti-extraction structure, also include shell body, the shell body is set to the outer side of the magnet yoke and its top end is arranged on the upper side of the upper pressing ring and is set, limiting edge is arranged on the outer ring of the rotor disc, the bottom end of the shell body is abutted on the limiting edge.
[0013] As an optimal scheme of the utility model, the top end of the magnetic steel is provided with a top protruding part protruding upwards relative to the top surface thereof, the top protruding part is arranged on the outer ring of the magnetic steel, the first clamping groove is formed between the inner side of the top protruding part and the top surface of the magnetic steel, the outer side surface of the first clamping part is attached to the inner side surface of the top protruding part, and the flat plate part is attached to the protruding end surface of the top protruding part.
[0014] As an optimal scheme of the utility model, still include stator upper cover, the stator upper cover is hollow, be provided with a plurality of connecting holes on the stator upper cover, be provided with a plurality of connecting columns corresponding with the connecting hole on the stator core, the stator upper cover is set up in the upper side of the motor permanent magnet anti -drop structure and the stator core and is connected on the connecting column through the connecting piece passing through the connecting hole, the periphery of the stator upper cover is in abutment with the top end of the shell.
[0015] Compared with the prior art, the utility model has following positive effects:
[0016] The motor permanent magnet anti-drop structure provided by the utility model, comprising a magnetic steel, an upper pressing ring and a rotor disc, a first clamping groove is arranged at the top end of the magnetic steel, a first clamping part matched with the first clamping groove is arranged on the upper pressing ring, a second clamping groove is arranged at the bottom end of the magnetic steel, and a second clamping part matched with the second clamping groove is arranged at the top end of the rotor disc, and the upper pressing ring and the rotor disc are clamped at the top end and the bottom end of the magnetic steel respectively. The motor permanent magnet anti-drop structure in the utility model is clamped at the top end and the bottom end of the magnetic steel through the first clamping groove and the second clamping groove and the upper pressing ring and the rotor disc respectively, so that the magnetic steel is limited, the fixation of the magnetic steel is more stable and reliable, and the utility model is suitable for high-speed and strong-vibration unmanned aerial vehicle power systems. The problem that the magnetic steel of the unmanned aerial vehicle motor is easy to fall off is solved. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.
[0018] Figure 1 It is the structure schematic view of the motor of the motor permanent magnet anti-drop structure of the utility model;
[0019] Figure 2 It is the front view of the motor of the motor permanent magnet anti-drop structure of the utility model;
[0020] Figure 3 It is Figure 2 The sectional view of A-A;
[0021] Figure 4 It is Figure 3 The local enlarged view of B.
[0022] In the diagram: 1. Upper pressure ring; 11. Flat plate; 12. Lower protrusion; 2. Magnet; 21. First slot; 22. Second slot; 23. Top protrusion; 24. Bottom protrusion; 3. Rotor disc; 31. Top surface; 32. Upper protrusion; 33. Limiting edge; 4. Magnet yoke; 5. Outer shell; 6. Rotating shaft; 7. Stator core; 8. Stator iron core; 81. Connecting column; 9. Stator top cover; 91. Connecting hole; 101. Connecting shaft. Detailed Implementation
[0023] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and for simplification, 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," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0024] In the description of this utility model, it should also 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0025] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings.
[0026] Example 1:
[0027] This embodiment provides a permanent magnet anti-detachment structure for motors, such as... Figures 1-4 As shown, the assembly includes a magnet 2, an upper pressure ring 1, and a rotor disk 3. The top of the magnet 2 has a first slot 21, the upper pressure ring 1 has a first engaging portion that matches the first slot 21, the bottom of the magnet 2 has a second slot 22, and the top of the rotor disk 3 has a second engaging portion that matches the second slot 22. The upper pressure ring 1 and the rotor disk 3 are respectively engaged with the top and bottom of the magnet 2. Multiple magnets 2 are arranged in a ring to form a magnet assembly. Preferably, the magnet 2 is made of neodymium iron boron material.
[0028] The motor permanent magnet anti-falling structure in the embodiment achieves the limiting of the magnetic steel 2 by the top end and bottom end of the magnetic steel 2 being clamped with the upper pressing ring 1 and the rotor disc 3 through the first clamping groove 21 and the second clamping groove 22 respectively, so that the fixing of the magnetic steel 2 is more stable and reliable, and the motor power system of the unmanned aerial vehicle is suitable for high speed and strong vibration. The problem of the magnetic steel of the unmanned aerial vehicle motor falling off is solved.
[0029] As a preferred embodiment, as shown in Figure 4 The upper pressing ring 1 includes a flat plate part 11, the first clamping part is a lower protruding part 12 protruding downward relative to the flat plate part 11, the lower protruding part 12 is connected to the inner side of the flat plate part 11, and the lower protruding part 12 is clamped in the first clamping groove 21 at the top end of the magnetic steel 2.
[0030] In the embodiment, the clamping of the lower protruding part 12 and the first clamping groove 21 can limit the movement of the top end of the magnetic steel 2 in the radial direction of the motor, thereby improving the stability.
[0031] As a preferred embodiment, as shown in Figure 4 The top end of the magnetic steel 2 is provided with a top protruding part 23 protruding upward relative to the top surface thereof, and the top protruding part 23 is arranged at the outer circle of the magnetic steel 2. The first clamping groove 21 is formed between the inner side of the top protruding part 23 and the top surface of the magnetic steel 2. The outer side surface of the first clamping part is in contact with the inner side surface of the top protruding part 23, and the flat plate part 11 is in contact with the protruding end surface of the top protruding part 23.
[0032] Preferably, the axial height of the top protruding part 23 is 0.75 mm, the radial protruding amount of the top protruding part 23 is 1.8 mm, and the depth of the lower protruding part 12 protruding downward relative to the flat plate part 11 is 0.75.
[0033] In the embodiment, the clamping action between the top protruding part 23 at the top end of the magnetic steel 2 and the lower protruding part 12 of the upper pressing ring 1 limits the movement of the top end of the magnetic steel 2 to the inner side in the radial direction of the motor and limits the upward movement of the top end of the magnetic steel 2 in the axial direction, thereby effectively limiting the displacement of the top end of the magnetic steel 2.
[0034] As a preferred embodiment, the top end surface 31 is arranged at the top of the rotor disc 3, the second clamping part is an upper protruding part 32 protruding upward relative to the top end surface 31, the upper protruding part 32 is connected to the inner side of the top end surface 31, and the upper protruding part 32 is clamped in the second clamping groove 22 at the bottom end of the magnetic steel 2.
[0035] In the embodiment, the clamping of the upper protruding part 32 and the second clamping groove 22 can limit the movement of the bottom end of the magnetic steel 2 in the radial direction of the motor, thereby improving the stability.
[0036] As a preferred embodiment, a bottom protrusion 24 is arranged at the bottom end of the magnetic steel 2, which protrudes downward relative to the bottom surface of the magnetic steel 2. The bottom protrusion 24 is arranged at the outer ring of the magnetic steel 2, and a second clamping groove 22 is formed between the inner side of the bottom protrusion 24 and the bottom surface of the magnetic steel 2. The outer side surface of the second clamping portion is in contact with the inner side surface of the bottom protrusion 24, and the top end surface 31 is in contact with the protruding end surface of the bottom protrusion 24.
[0037] Preferably, the axial height of the bottom protrusion 24 is 0.75 mm, the radial protrusion of the bottom protrusion 24 is 1.8 mm, and the corresponding upper protrusion 32 protrudes upward relative to the top end surface 31 by a depth of 0.75.
[0038] In the present embodiment, the displacement of the bottom end of the magnetic steel 2 is limited in the radial direction of the motor and in the axial direction by the clamping action between the bottom protrusion 24 at the bottom end of the magnetic steel 2 and the upper protrusion 32 of the rotor disc 3, thereby effectively limiting the displacement of the bottom end of the magnetic steel 2.
[0039] In the present embodiment, the overall limiting of the magnetic steel 2 is achieved by the limiting action of the upper pressing ring 1 and the rotor disc 3 on the top end and the bottom end of the magnetic steel 2 respectively, thereby achieving good stability during motor operation and avoiding falling off.
[0040] As a preferred embodiment, the motor permanent magnet anti-falling structure of the present embodiment further comprises a magnet yoke 4, which is arranged outside the magnetic steel 2 and is limited between the flat plate portion 11 of the upper pressing ring and the top end surface 31 of the rotor disc 3. The magnet yoke 4 is arranged outside the magnetic steel 2 to further limit the magnetic steel 2.
[0041] As a preferred embodiment, a glue layer is arranged between the first clamping groove 21 and the first clamping portion, and between the second clamping groove 22 and the second clamping portion. The glue layer uses a two-component modified epoxy resin glue, and the micro gap (0.02-0.05 mm) between the first clamping groove 21 and the first clamping portion and between the second clamping groove 22 and the second clamping portion further improves the stability of the fixed magnetic steel 2.
[0042] The present embodiment also provides a motor, as shown in Figures 1-4 The motor further comprises an outer shell 5, which is arranged outside the magnet yoke 4 and extends to the upper side of the upper pressing ring 1 at the top end. A limiting edge 33 is arranged on the outer ring of the rotor disc 3, which is located below the top end surface 31, and the bottom end of the outer shell 5 abuts against the limiting edge 33. The outer shell 5 can be made of aluminum to reduce its own weight. The outer shell 5 further limits the magnet yoke 4 to ensure the stability of the position of the magnetic steel 2 inside the magnet yoke 4.
[0043] As a preferred embodiment, the motor of the embodiment further comprises a rotating shaft 6, a stator core 7 and a stator core 8, the rotating shaft 6 is rotatably connected to the center of the stator core 7 through a bearing, the stator core 8 is sleeved on the outside of the stator core 7 and located on the inside of the magnetic steel 2 and further limits the inside of the magnetic steel 2. The bottom end of the rotating shaft 6 is connected with the rotor disc 3 and can drive the rotor disc 3 to rotate synchronously.
[0044] When the motor of the embodiment is applied to a drone, two connecting shafts 101 are arranged on the bottom end of the rotor disc 3 and connected with the propeller blades through the connecting shafts 101, so as to drive the rotor disc 3 and the propeller blades to rotate through the rotating shaft 6.
[0045] As a preferred embodiment, the motor of the embodiment further comprises a stator upper cover 9, the stator upper cover 9 is hollow to reduce its weight and has good heat dissipation performance. A plurality of connecting holes 91 are arranged on the stator upper cover 9, a plurality of connecting columns 81 corresponding to the connecting holes 91 are arranged on the stator core 7, the stator upper cover 9 is arranged on the upper side of the motor permanent magnet anti-falling structure and the stator core 8 and connected to the connecting columns 81 through the connecting pieces passing through the connecting holes 91, and the periphery of the stator upper cover 9 abuts against the top end of the outer shell 5. The stator upper cover 9 and the outer shell 5 protect the inside components and have good integrity.
[0046] It should be noted that the "inside" in the above description refers to the side of the rotating shaft 6 close to the center of the motor, and the "outside" refers to the side of the rotating shaft 6 away from the center of the motor.
[0047] The application of the motor permanent magnet anti-falling structure of the embodiment to the motor can significantly shorten the assembly time of the magnetic steel, and the assembly and positioning time is shortened by 40% without the need for a special clamp. The tolerance of the thickness of the glue layer is relaxed from ±0.05mm to ±0.15mm. The mechanical locking strength of the motor of the application is compared with that of the existing motor, and the results are shown in Table 1. It can be seen that the motor of the application can meet the requirements of anti-centrifugal force under high speed and anti-displacement in vibration environment.
[0048]
[0049] Table 1
[0050] The above only describes the preferred embodiments of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can make several modifications and improvements without departing from the creative concept of the utility model, which should be covered in the protection scope of the utility model.
Claims
1. An electric machine permanent magnet anti-falling structure, characterized in that, The magnetic steel (2) is provided with a first clamping groove (21) at the top end, the upper pressing ring (1) is provided with a first clamping part matched with the first clamping groove (21), the magnetic steel (2) is provided with a second clamping groove (22) at the bottom end, and the rotor disc (3) is provided with a second clamping part matched with the second clamping groove (22) at the top end, and the upper pressing ring (1) and the rotor disc (3) are clamped at the top end and the bottom end of the magnetic steel (2) respectively.
2. The permanent magnet anti-extraction structure of an electric machine according to claim 1, characterized in that, The upper pressing ring comprises a flat plate part (11), the first clamping part is a lower protruding part (12) protruding downward relative to the flat plate part (11), and the lower protruding part (12) is connected to the inner side of the flat plate part (11).
3. The permanent magnet anti-extraction structure of an electric machine according to claim 2, characterized in that, The top end of the magnetic steel (2) is provided with a top protruding part (23) protruding upward relative to the top surface, the top protruding part (23) is arranged at the outer circle of the magnetic steel (2), the first clamping groove (21) is formed between the inner side of the top protruding part (23) and the top surface of the magnetic steel (2), the outer side surface of the first clamping part is matched with the inner side surface of the top protruding part (23), and the flat plate part (11) is matched on the protruding end surface of the top protruding part (23).
4. The permanent magnet anti-extraction structure of an electric machine according to claim 3, characterized in that, The top end of the rotor disc (3) has a top end surface (31), the second clamping part is an upper protruding part (32) protruding upward relative to the top end surface (31), the upper protruding part (32) is connected to the inner side of the top end surface (31), and the upper protruding part (32) is clamped in the second clamping groove (22) at the bottom end of the magnetic steel (2).
5. The permanent magnet demagnetization prevention structure of an electric machine according to claim 4, characterized in that, The bottom end of the magnetic steel (2) is provided with a bottom protruding part (24) protruding downward relative to the bottom surface, the bottom protruding part (24) is arranged at the outer circle of the magnetic steel (2), the second clamping groove (22) is formed between the inner side of the bottom protruding part (24) and the bottom surface of the magnetic steel (2), the outer side surface of the second clamping part is matched with the inner side surface of the bottom protruding part (24), and the top end surface (31) is matched on the protruding end surface of the bottom protruding part (24).
6. The permanent magnet demagnetization prevention structure of an electric machine according to claim 5, wherein The magnet yoke (4) is arranged outside the magnetic steel (2) and is limited between the flat plate part (11) of the upper pressing ring and the top end surface (31) of the rotor disc (3).
7. The permanent magnet demagnetization prevention structure of an electric machine according to claim 1, characterized by A glue layer is arranged between the first clamping groove (21) and the first clamping part and between the second clamping groove (22) and the second clamping part.
8. An electric machine characterized by The motor permanent magnet anti-disengagement structure comprises the outer shell (5), the outer shell (5) is arranged outside the magnet yoke (4) and extends to the upper side of the upper pressing ring (1) at the top end, a limiting edge (33) is arranged at the outer circle of the rotor disc (3), and the bottom end of the outer shell (5) is abutted on the limiting edge (33).
9. An electric machine according to claim 8, characterised in that It also includes a rotating shaft (6), a stator core (7) and a stator core (8), the rotating shaft (6) is rotatably connected to the center of the stator core (7) through a bearing, the stator core is sleeved on the outside of the stator core (7) and located on the inside of the magnetic steel (2), the bottom end of the rotating shaft (6) is connected with the rotor disc (3) and can drive the rotor disc (3) to rotate synchronously.
10. An electric machine according to claim 9, characterized in that It also includes a stator upper cover (9), the stator upper cover (9) is hollow, a plurality of connecting holes (91) are arranged on the stator upper cover (9), a plurality of connecting columns (81) corresponding to the connecting holes (91) are arranged on the stator core (7), the stator upper cover (9) is arranged on the upper side of the motor permanent magnet anti-off structure and the stator core (8) and connected to the connecting column (81) through the connecting hole (91) by a connecting piece, the periphery of the stator upper cover (9) abuts against the top end of the outer shell (5).