Motor structure and assembly process thereof

Abstract

The invention discloses a motor structure and an assembly process thereof, and relates to the technical field of motors. The motor structure comprises a motor body, a PCB and a stator and rotor assembly, the motor body comprises a shell, an impeller arranged in the shell and an installation groove formed in the side portion of the shell, the stator and rotor assembly is arranged in the installation groove and coaxially connected with the impeller, and the PCB is contained between the stator and rotor assembly and the installation groove. A gap is formed between the PCB and the groove bottom surface of the mounting groove, and a heat-conducting medium is accommodated in the gap. According to the motor structure, heat generated on the PCB in the motor structure can be transmitted to the shell through the heat-conducting medium, and then rapid heat dissipation is achieved through the heat conduction effect of the shell and the air cooling effect of the impeller, so that the heat dissipation efficiency of the PCB is greatly improved, and the situation that the PCB is damaged due to overheating is avoided; meanwhile, the stator and rotor assembly is directly installed outside the motor body, so that the overall structure of the motor structure is more compact, and the application range is wider.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a motor structure and an assembly process thereof. Background Art

[0002] The motor structure is a driving mechanism for outputting driving force, which generates driving force through the change of magnetic field generated by the stator and rotor components. A PCB board is installed in the motor structure, and the PCB board is used to connect the power supply and drive the motor structure to operate.

[0003] During the use of the motor structure, the PCB board will generate heat. In the prior art, natural heat dissipation is usually used to deal with the heating phenomenon of the PCB board. However, the natural heat dissipation method has a poor heat dissipation effect and is prone to damage to the PCB board due to overheating. In severe cases, it may even cause the melting of wires, cables and other materials, thereby causing a fire, which poses a great safety hazard. Summary of the invention

[0004] One purpose of the present application is to overcome the deficiencies of the prior art and provide a motor structure that can achieve efficient heat dissipation of a PCB board.

[0005] The present application provides a motor structure that adopts the following technical solution: A motor structure includes a motor body, a PCB board and a stator-rotor assembly, wherein the motor body includes a shell, an impeller arranged in the shell, and a mounting groove opened on the side of the shell, the stator-rotor assembly is arranged in the mounting groove and is coaxially connected to the impeller, the PCB board is accommodated between the stator-rotor assembly and the mounting groove, and there is a gap between the PCB board and the bottom surface of the mounting groove, and a heat-conducting medium is placed in the gap.

[0006] By adopting the above technical solution, the heat generated on the PCB board can be transferred to the shell through the heat-conducting medium, and then the heat is quickly dissipated through the heat conduction effect of the shell and the air cooling effect of the impeller, which greatly improves the heat dissipation efficiency of the PCB board and avoids damage to the PCB board due to overheating; at the same time, the stator and rotor components are directly installed on the outside of the motor body, making the overall structure of the motor structure more compact and having a wider range of applications.

[0007] Preferably, the stator-rotor assembly includes a rotor module and a stator module surrounding the circumference of the rotor module. The rotor module includes a rotating shaft and a rotor coaxially sleeved on the rotating shaft. The rotor and the stator module are concentrically arranged. Two impellers are also coaxially sleeved on the rotating shaft. The two impellers are respectively located at both ends of the rotor.

[0008] By adopting the above technical solution, the two impellers can air-cool the rotor and stator modules during the rotation of the rotor, effectively enhancing the heat dissipation effect of the rotor and stator modules and preventing the rotor and stator modules from being damaged due to overheating.

[0009] Preferably, a first mounting seat and a plurality of second mounting seats are provided in the mounting groove, the plurality of second mounting seats are arranged at intervals around the circumference of the first mounting seat, the rotating shaft is coaxially inserted in the first mounting seat, the stator module is carried on the plurality of second mounting seats and its axis coincides with the circumferential center line of the plurality of second mounting seats.

[0010] By adopting the above technical solution, the rotor and stator modules can be coaxially mounted on a concentric first mounting seat and a plurality of second mounting seats, respectively, thereby effectively improving the concentricity between the rotor and stator modules.

[0011] Preferably, the rotating shaft has a plug-in end, the plug-in end is inserted into the first mounting seat and connected to the impeller, the plug-in end is sleeved with a bearing module, and a step portion is provided on the side of one end of the bearing module away from the impeller, and the step portion conflicts with the end of the first mounting seat.

[0012] By adopting the above-mentioned technical solution, the step portion can be in contact with the first mounting seat and realize the limitation of the bearing module, thereby preventing the preload force between the bearing module and the motor body from being gradually reduced or failed due to the rotation and pulling of the impeller, effectively reducing the noise and vibration of the motor structure during operation, improving the quality of the motor structure, and extending the service life of the motor structure.

[0013] Preferably, the bearing module includes a first bearing and a second bearing arranged axially along the rotating shaft, an elastic member is arranged between the first bearing and the second bearing, the elastic member is sleeved on the rotating shaft and its two ends are respectively connected to the outer ring of the first bearing and the outer ring of the second bearing.

[0014] By adopting the above technical solution, the installation positions of the first bearing and the second bearing arranged at the same end of the rotor in the first mounting seat can be kept consistent, thereby avoiding relative deflection between the rotor and the stator module, and effectively improving the concentricity between the rotor and the stator module.

[0015] Preferably, the rotor is provided with a plurality of magnetic pole slots around its own circumference, the magnetic pole slots comprising a rectangular slot body and two extension slots respectively located at both ends of the slot body, each of the slot bodies respectively accommodating an insert, at least one end of the insert protruding from the slot body, and a magnetic isolation bridge is formed between the slot wall at one end of the extension slot away from the insert and the outer wall surface of the rotor.

[0016] By adopting the above technical solution, the insert protruding from the slot body can cooperate with the rotor to form a salient pole structure, thereby reducing the magnetic resistance when the rotor rotates and increasing the rotation speed of the rotor.

[0017] Preferably, a plurality of third mounting seats are arranged at intervals around one end of the stator module in the circumferential direction thereof, the plurality of third mounting seats correspond one-to-one to the plurality of second mounting seats, and the corresponding third mounting seats are positively docked with the second mounting seats.

[0018] By adopting the above technical solution, the stator module can be coaxially connected with multiple second mounting seats through the docking of the third mounting seat and the second mounting seat, which effectively improves the concentricity between it and the first mounting seat, thereby improving the concentricity between the stator module and the rotor.

[0019] Preferably, a plurality of clearance holes are provided on the PCB board, and the plurality of clearance holes correspond one-to-one to the plurality of second mounting seats, and each of the second mounting seats is respectively penetrated into the corresponding clearance hole and is clearance-matched with the clearance hole.

[0020] By adopting the above technical solution, it is possible to avoid circuit failure caused by direct contact between the PCB board and the housing.

[0021] Preferably, the stator module includes a stator and a frame coaxially arranged at both ends of the stator, and one of the two frame closer to the PCB board is provided with a plurality of piercing terminals around its circumference, and the plurality of piercing terminals are connected to the PCB board.

[0022] By adopting the above technical solution, the installation strength of the PCB board on the housing is effectively improved.

[0023] Another object of the present application is to provide an assembly process for a motor structure.

[0024] The present application provides a motor structure that adopts the following technical solution: An assembly process of a motor structure, the assembly process is based on the above motor structure, and comprises the following steps: Step 1, sequentially mounting a bearing module and a rotor module on a rotating shaft, then inserting the rotating shaft into a first mounting seat and accommodating the bearing module in the first mounting seat; Step 2, applying a heat-conducting medium into the installation groove; Step 3, installing the PCB board on the frame of the stator module, and then connecting one end of the stator module on which the PCB board is installed to a plurality of second mounting seats; Step 4: install the impeller in the housing and connect it coaxially with the rotating shaft.

[0025] By adopting the above technical solution, the assembled motor structure can have a higher structural compactness and higher heat dissipation efficiency, and at the same time, the stator module and the rotor module can have a higher concentricity.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The heat generated on the PCB can be transferred to the housing through the heat-conducting medium, and then the heat is quickly dissipated through the heat conduction of the housing and the air cooling of the impeller, which greatly improves the heat dissipation efficiency of the PCB and avoids damage to the PCB due to overheating; 2. The stator and rotor assemblies are directly mounted on the outside of the motor body, making the overall structure of the motor more compact and having a wider range of applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic structural diagram of the motor structure in Example 1 of the present application; Figure 2 is a schematic structural diagram of the motor body in Example 1 of the present application; Figure 3 is a schematic diagram of a partial structure of a motor body in Embodiment 1 of the present application; Figure 4 is a schematic structural diagram of the stator and rotor assembly in Example 1 of the present application; Figure 5 It is a top view of the stator and rotor assembly in Example 1 of the present application.

[0028] Markings in the accompanying drawings: 1. Motor body; 11. Housing; 12. Impeller; 13. Mounting slot; 2. PCB board; 3. Stator and rotor assembly; 31. Rotor module; 311. Rotating shaft; 312. Rotor; 313. Fan wheel; 314. Pole slot; 3141. Slot body; 3142. Extension slot; 315. Insert; 316. Magnetic isolation bridge; 32. Stator module; 321. Stator; 322. Skeleton; 323. Piercing terminal; 4. Heat conducting medium; 5. First mounting seat; 6. Second mounting seat; 7. Bearing module; 71. First bearing; 72. Second bearing; 73. Elastic member; 8. Step portion; 9. Third mounting seat; 10. Clearance hole. DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-5 The present invention is described in further detail.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] Example 1: See Figure 1 and Figure 3 As shown, a motor structure is shown, including a motor body 1, a PCB board 2 and a stator-rotor assembly 3, the motor body 1 includes a volute metal shell 11, an impeller 12 rotatably arranged in the shell 11, and a mounting groove 13 opened on the side of the shell 11, the stator-rotor assembly 3 is arranged in the mounting groove 13 and is coaxially connected to the impeller 12, the PCB board 2 is accommodated between the stator-rotor assembly 3 and the mounting groove 13, and there is a gap between the PCB board 2 and the bottom surface of the mounting groove 13, and a heat-conducting medium 4 is arranged in the gap.

[0032] Among them, the heat-conducting medium 4 is heat-conducting silicone. The heat generated on the PCB board 2 can be transferred to the metal shell 11 through the heat-conducting silicone, and then the heat is quickly dissipated through the heat conduction effect of the metal shell 11 and the air cooling effect of the impeller 12, which greatly improves the heat dissipation efficiency of the PCB board 2 and avoids damage to the PCB board 2 due to overheating; at the same time, the stator and rotor assembly 3 is directly installed on the outside of the motor body 1, so that the overall structure of the motor structure is more compact and has a wider range of applications.

[0033] In this embodiment, combined with Figure 4 As shown, the stator-rotor assembly 3 includes a rotor module 31, a stator module 32 surrounding the circumference of the rotor module 31, the rotor module 31 includes a rotating shaft 311, a rotor 312 coaxially sleeved on the rotating shaft 311, the rotor 312 and the stator module 32 are concentrically arranged, and two impellers 313 are coaxially sleeved on the rotating shaft 311, and the two impellers 313 are respectively located at both ends of the rotor 312. The two impellers 313 can air-cool the rotor 312 and the stator module 32 during the rotation of the rotor 312, effectively enhancing the heat dissipation effect of the rotor 312 and the stator module 32, and preventing the rotor 312 and the stator module 32 from being damaged due to overheating.

[0034] In this embodiment, combined with Figure 2As shown, a first mounting seat 5 and three second mounting seats 6 are arranged in the mounting groove 13, and the three second mounting seats 6 are arranged at intervals around the circumference of the first mounting seat 5. The rotating shaft 311 is coaxially inserted in the first mounting seat 5, and the stator module 32 is carried on the three second mounting seats 6 and its axis coincides with the surrounding center line of the three second mounting seats 6. Among them, the first mounting seat 5 and the three second mounting seats 6 are integrally formed in the mounting groove 13 through fine machining, and the two can have a high concentricity, so that the rotor 312 and the stator module 32 coaxially mounted on the first mounting seat 5 and the plurality of second mounting seats 6 can also have a high concentricity.

[0035] In this embodiment, combined with Figure 4 As shown, the rotating shaft 311 has a plug-in end, which is inserted into the first mounting seat 5 and connected to the impeller 12. The plug-in end is sleeved with a bearing module 7. The end of the bearing module 7 away from the impeller 12 is ringed with a step portion 8, and the step portion 8 conflicts with the end of the first mounting seat 5. The step portion 8 can conflict with the first mounting seat 5 and limit the bearing module 7, so as to avoid the preload force between the bearing module 7 and the first mounting seat 5 being gradually reduced or invalidated due to the rotation and pulling of the impeller 12, effectively reducing the noise and vibration of the motor structure during operation, improving the quality of the motor structure, and extending the service life of the motor structure.

[0036] In this embodiment, the bearing module 7 includes a first bearing 71 and a second bearing 72 arranged along the axial direction of the rotating shaft 311, and an elastic member 73 is arranged between the first bearing 71 and the second bearing 72. The elastic member 73 is a wave spring, and the elastic member 73 is sleeved on the rotating shaft 311 and its two ends are respectively connected to the outer ring of the first bearing 71 and the outer ring of the second bearing 72. The first bearing 71 and the second bearing 72 arranged at the same end of the rotor 312 can keep the same installation position in the first mounting seat 5, so as to avoid the deflection of the rotor 312 due to the inconsistent installation position of the first bearing 71 and the second bearing 72, and effectively improve the concentricity between the rotor 312 and the stator module 32.

[0037] In this embodiment, combined with Figure 5 As shown, four magnetic pole slots 314 are provided on the rotor 312 around its own circumference, and the outer part of the rotor 312 has four arc-shaped outer walls around its own circumference. The four magnetic pole slots 314 correspond to the four arc-shaped outer walls one by one, and the length direction of the magnetic pole slots 314 is parallel to the chord length direction of the arc-shaped outer wall. The magnetic pole slots 314 include a rectangular slot body 3141, two extension slots 3142 respectively located at both ends of the slot body 3141, and each slot body 3141 contains a plug 315, at least one end of the plug 315 protrudes from the slot body 3141, and a magnetic isolation bridge 316 is formed between the slot wall at one end of the extension slot 3142 away from the plug 315 and the outer wall surface of the rotor 312.

[0038] In this way, the insert 315 protruding from the slot body 3141 can cooperate with the arc-shaped outer wall to form a salient pole structure, reducing the magnetic resistance when the rotor 312 rotates and increasing the rotation speed of the rotor 312; at the same time, the arc-shaped outer wall can also form an uneven air gap with the stator module 32, and the magnetic flux density distribution in the air gap is closer to a sine wave, which is beneficial to reducing the tooth torque of the motor structure; and, through the setting of the extension slot 3142, it can avoid the insert 315 being too close to the magnetic isolation bridge 316 and interfering with the magnetic isolation bridge 316.

[0039] In this embodiment, combined with Figure 1 and Figure 4 As shown, three third mounting seats 9 are arranged at intervals around one end of the stator module 32 around its own circumferential direction, and the three third mounting seats 9 correspond to the three second mounting seats 6 one by one, and the corresponding third mounting seats 9 and the second mounting seats 6 are butt-jointed in position by bolts. The stator module 32 can achieve coaxial connection with the three second mounting seats 6 through the butt-jointing of the third mounting seats 9 and the second mounting seats 6, effectively improving the concentricity between the stator module 32 and the first mounting seat 5, thereby improving the concentricity between the stator module 32 and the rotor 312.

[0040] In this embodiment, combined with Figure 1-2 As shown, three clearance holes 10 are provided on the PCB board 2, and the three clearance holes 10 correspond to the three second mounting seats 6 one by one, and each second mounting seat 6 is respectively penetrated in the corresponding clearance hole 10 and has clearance fit with the clearance hole 10. In this way, it is possible to avoid direct contact between the PCB board 2 and the housing 11, which may cause circuit failure.

[0041] In this embodiment, combined with Figure 1 and Figure 4 As shown, the stator module 32 includes a stator 321, a frame 322 coaxially arranged at both ends of the stator 321, three third mounting seats 9 are arranged on the peripheral side of the stator 321, and one of the two frame 322 closer to the PCB board 2 is provided with four piercing terminals 323 around its own circumference, and the four piercing terminals 323 are welded to the PCB board 2.

[0042] Embodiment 2: This embodiment discloses an assembly process of a motor structure. The assembly process is based on the motor structure in Embodiment 1 and includes the following steps: Step 1, sequentially mount the bearing module 7 and the rotor module 31 on the rotating shaft 311, then insert the rotating shaft 311 into the first mounting seat 5 and accommodate the bearing module 7 in the first mounting seat 5; Specifically, firstly, the second bearing 72, the elastic member 73 and the first bearing 71 are sequentially mounted on the rotating shaft 311, and then one of the two impellers 313, the rotor 312 and the other of the two impellers 313 are sequentially mounted on the rotating shaft 311, and finally, the end of the rotating shaft 311 on which the bearing module 7 is mounted is inserted into the first mounting seat 5 so that the step portion 8 on the first bearing 71 is in conflict with the end of the first mounting seat 5; Step 2, applying the heat conducting medium 4 into the installation groove 13; Step 3, installing the PCB board 2 on one of the skeletons 322 of the stator module 32, and then connecting one end of the stator module 32 on which the PCB board 2 is installed to the three second mounting seats 6, and during the connection, the three second mounting seats 6 are respectively inserted into the three clearance holes 10 on the PCB board 2; Specifically, the four piercing terminals 323 on the frame 322 are welded to the PCB board 2, and then the three third mounting seats 9 on the circumferential side of the stator 321 are correspondingly connected to the three second mounting seats 6 by bolts. After the connection is completed, the PCB board 2 is in contact with the heat conducting medium 4; Step 4: Install the impeller 12 in the housing 11 and connect it coaxially with the rotating shaft 311 .

[0043] The motor structure assembled by the above-mentioned assembly process can have a higher structural compactness and a higher heat dissipation efficiency, and at the same time, the stator module 32 and the rotor module 31 can have a higher concentricity.

[0044] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor structure, comprising a motor body (1), a PCB board (2) and a stator and rotor assembly (3), characterized in that: The motor body (1) comprises a housing (11), an impeller (12) arranged in the housing (11), and a mounting groove (13) opened on the side of the housing (11); the stator-rotor assembly (3) is arranged in the mounting groove (13) and is coaxially connected to the impeller (12); the PCB board (2) is accommodated between the stator-rotor assembly (3) and the mounting groove (13); a gap is provided between the PCB board (2) and the bottom surface of the mounting groove (13); a heat conducting medium (4) is accommodated in the gap.

2. A motor structure according to claim 1, characterized in that: The stator-rotor assembly (3) comprises a rotor module (31) and a stator module (32) surrounding the rotor module (31); the rotor module (31) comprises a rotating shaft (311) and a rotor (312) coaxially sleeved on the rotating shaft (311); the rotor (312) and the stator module (32) are concentrically arranged; two impellers (313) are coaxially sleeved on the rotating shaft (311); the two impellers (313) are respectively located at two ends of the rotor (312).

3. A motor structure according to claim 2, characterized in that: A first mounting seat (5) and a plurality of second mounting seats (6) are arranged in the mounting groove (13); the plurality of second mounting seats (6) are arranged at intervals around the circumference of the first mounting seat (5); the rotating shaft (311) is coaxially inserted in the first mounting seat (5); the stator module (32) is supported on the plurality of second mounting seats (6) and its axis coincides with the circumferential center line of the plurality of second mounting seats (6).

4. A motor structure according to claim 3, characterized in that: The rotating shaft (311) has a plug-in end, the plug-in end is inserted into the first mounting seat (5) and connected to the impeller (12), the plug-in end is sleeved with a bearing module (7), and a step portion (8) is provided on the side of one end of the bearing module (7) away from the impeller (12), and the step portion (8) is in conflict with the end of the first mounting seat (5).

5. A motor structure according to claim 4, characterized in that: The bearing module (7) comprises a first bearing (71) and a second bearing (72) arranged along the axial direction of the rotating shaft (311); an elastic member (73) is provided between the first bearing (71) and the second bearing (72); the elastic member (73) is sleeved on the rotating shaft (311) and its two ends are respectively connected to the outer ring of the first bearing (71) and the outer ring of the second bearing (72).

6. A motor structure according to any one of claims 2 to 5, characterized in that: The rotor (312) is provided with a plurality of magnetic pole slots (314) around its own circumference. The magnetic pole slots (314) include a rectangular slot body (3141) and two extension slots (3142) respectively located at two ends of the slot body (3141). An insert (315) is respectively accommodated in each slot body (3141). At least one end of the insert (315) protrudes from the slot body (3141). A magnetic isolation bridge (316) is formed between the slot wall at one end of the extension slot (3142) away from the insert (315) and the outer wall surface of the rotor (312).

7. A motor structure according to any one of claims 3 to 5, characterized in that: A plurality of third mounting seats (9) are arranged at intervals around one end of the stator module (32) at a circumferential angle thereof, the plurality of third mounting seats (9) corresponding to the plurality of second mounting seats (6) one by one, and the corresponding third mounting seats (9) and the second mounting seats (6) are properly docked.

8. A motor structure according to any one of claims 3 to 5, characterized in that: The PCB board (2) is provided with a plurality of clearance holes (10), the plurality of clearance holes (10) corresponding one-to-one to the plurality of second mounting seats (6), and each of the second mounting seats (6) is respectively inserted into the corresponding clearance hole (10) and is clearance-matched with the clearance hole (10).

9. A motor structure according to any one of claims 2 to 5, characterized in that: The stator module (32) comprises a stator (321) and a frame (322) coaxially arranged at two ends of the stator (321); one of the two frames (322) closer to the PCB board (2) is provided with a plurality of piercing terminals (323) around its circumference; the plurality of piercing terminals (323) are connected to the PCB board (2).

10. A motor structure assembly process, characterized in that: The assembly process is based on the motor structure according to any one of claims 6 to 9, and comprises the following steps: Step 1, sequentially mounting the bearing module (7) and the rotor module (31) on the rotating shaft (311), then inserting the rotating shaft (311) into the first mounting seat (5) and accommodating the bearing module (7) in the first mounting seat (5); Step 2, applying a heat-conducting medium (4) into the installation groove (13); Step 3, installing the PCB board (2) on the frame (322) of the stator module (32), and then connecting one end of the stator module (32) on which the PCB board (2) is installed to a plurality of second mounting seats (6); Step 4: Install the impeller (12) in the housing (11) and connect it coaxially with the rotating shaft (311).

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