Motor

Abstract

The present invention provides a motor, comprising: a housing having an accommodating space, and a stator and a rotor that are accommodated in the accommodating space. The rotor can rotate relative to the stator. The housing comprises a first surface defining the accommodating space. The rotor comprises a rotating shaft that can rotate relative to the housing and magnetic steel fixed to the rotating shaft. The stator comprises a coil arranged spaced from the magnetic steel and around the periphery of the magnetic steel, and the coil is fixed to the first surface. The coil is adhesively bonded to the first surface, and the surface roughness of the first surface is 0.05-0.2 μm. The present invention effectively reduces the magnetic flux leakage, thereby enabling a motor to exhibit higher torque performance and have a simpler structure.

Description

A type of motor Technical Field

[0001] This invention relates to the field of motors, and more specifically to a miniature brushless hollow cup motor. Background Technology

[0002] The working principle of a brushless coreless motor is based on the principle that an electromagnetic field generates torque on a charged conductor. Specifically, when current passes through the stator coils, a rotating magnetic field is formed. The permanent magnets in the rotor are subjected to this rotating magnetic field, generating a rotational torque in the direction of the magnetic field, which in turn drives the rotor to rotate, thus enabling the motor to work.

[0003] However, motor products in this technology are prone to magnetic leakage, which affects the motor's torque performance.

[0004] Therefore, it is necessary to provide a motor that can effectively reduce leakage flux and improve motor torque performance. Technical issues

[0005] The purpose of this invention is to provide a motor that solves the technical problem of magnetic leakage in the prior art. Technical solutions

[0006] The technical solution of the present invention is as follows:

[0007] In a first aspect, the present invention provides an electric motor, comprising: a housing having a receiving space, and a stator and a rotor received within the receiving space, the rotor being rotatable relative to the stator, the housing including a first surface surrounding the receiving space, the rotor including a rotating shaft rotatable relative to the housing and a magnet fixed to the rotating shaft, the stator including coils spaced around the periphery of the magnet, the coils being fixed to the first surface, the coils being fixed to the first surface by adhesive, and the surface roughness of the first surface being 0.05-0.2 μm.

[0008] Preferably, the first surface is subjected to electropolishing treatment, the electropolishing treatment duration is 3-5s, and the current parameter of the electropolishing treatment is 5.5-55AS / dm.

[0009] Preferably, the coil is loop-shaped and includes a second surface facing the first surface, the second surface being bonded to the first surface with adhesive.

[0010] Preferably, the outer shell includes a hollow shell with openings at both ends, and a first cover and a second cover respectively covering both ends of the shell, the shell, the first cover and the second cover together defining the receiving space, and the first surface is provided on the shell.

[0011] Preferably, one end of the rotating shaft is fixed to the first cover by a first bearing, and the other end of the rotating shaft is fixed to the second cover by a second bearing, wherein the rotating shaft is rotatably connected to the first bearing and the second bearing respectively.

[0012] Preferably, there is an axial gap between the coil and the first cover, and an axial gap between the coil and the second cover.

[0013] Preferably, the first cover includes a first flange portion and a first positioning portion that protrude toward the housing respectively. The first positioning portion is located on one side of the first flange portion. The housing includes a cylindrical shell portion and a bent portion that extends from one end of the shell portion. The bent portion is provided with a first mounting hole and a positioning hole. The first mounting hole is inserted into the first flange portion, and the positioning hole is inserted into the first positioning portion.

[0014] Preferably, the second cover includes a second flange portion protruding toward the housing and a second positioning portion protruding on the circumferential surface of the second flange portion. The end of the housing that mates with the second cover has a second mounting hole and a first positioning groove. The second mounting hole is inserted into the second flange portion, and the first positioning groove is located at the opening of the second mounting hole and is inserted into the second positioning portion.

[0015] Preferably, the motor further includes a circuit board electrically connected to the coil, the circuit board being fixed to the second cover.

[0016] Preferably, the circuit board is located outside the receiving space, and the end of the second cover away from the housing has a third positioning part that protrudes toward the circuit board. The circuit board has a second positioning groove that is inserted and engaged with the third positioning part. Beneficial effects

[0017] The beneficial effects of this invention are as follows: In the motor of this invention, the coil is directly bonded and fixed to the first surface of the housing, eliminating the need for an insulating layer or insulating tape structure between the coil and the housing. This not only facilitates motor miniaturization and simplifies the structure but also effectively reduces magnetic leakage, resulting in higher motor torque performance. Furthermore, when the motor has the same dimensions, the coil thickness can be increased, thereby improving magnetic field performance and further enhancing motor torque performance. Simultaneously, setting the surface roughness of the first surface to 0.05-0.2μm ensures that the coil will not be scratched by the first surface when bonded and fixed to it with adhesive, effectively improving product yield. Attached Figure Description

[0018] Figure 1 is a schematic diagram of the structure of the motor of the present invention.

[0019] Figure 2 is a schematic diagram of the structure of the motor shown in Figure 1.

[0020] Figure 3 is a schematic diagram of the structure of the motor shown in Figure 1.

[0021] Figure 4 is a cross-sectional view of Figure 3 (AA).

[0022] Figure 5 is the right view of Figure 3.

[0023] Figure 6 is a BB cross-sectional view of Figure 5.

[0024] Figure 7 is a CC sectional view of Figure 5.

[0025] Figure 8 is an exploded view of the motor shown in Figure 1.

[0026] Figure 9 is an enlarged view of the structure of the second cover in the motor shown in Figure 8.

[0027] Figure 10 is an exploded view of the motor shown in Figure 1.

[0028] Figure 11 is an enlarged view of the structure of the first cover in the motor shown in Figure 10.

[0029] Figure 12 is an enlarged view of the structure of the second cover in the motor shown in Figure 10. Embodiments of the present invention

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0031] Please refer to Figures 1 to 12. An embodiment of the present invention provides an electric motor 10, including a housing 1, a stator 2, and a rotor 3. The housing 1 has a receiving space 101. The stator 2 and rotor 3 are respectively housed within the receiving space 101 of the housing 1. The rotor 3 is rotatable relative to the stator 2.

[0032] Specifically, the outer casing 1 includes a shell 102, a first cover 103, and a second cover 104. The shell 102 is a hollow structure with openings at both ends. The first cover 103 is fixedly attached to one end of the shell 102, and the second cover 104 is fixedly attached to the other end of the shell 102. The shell 102, the first cover 103, and the second cover 104 together define the receiving space 101.

[0033] Referring to Figures 4, 6, 8, and 10, the rotor 3 includes a rotating shaft 301 and a magnet 302. The rotating shaft 301 is rotatable relative to the outer casing 1, and the magnet 302 is fixed to the rotating shaft 301. The motor 10 also includes a first bearing 4 and a second bearing 5. One end of the rotating shaft 301 is connected to the outer casing 1 via the first bearing 4, and the other end of the rotating shaft 301 is connected to the outer casing 1 via the second bearing 5. In this embodiment, the first bearing 4 is mounted on the first cover 103, and the second bearing 5 is mounted on the second cover 104. One end of the rotating shaft 301 is connected to the first cover 103 via the first bearing 4, and the other end of the rotating shaft 301 is connected to the second cover 104 via the second bearing 5. Both the first bearing 4 and the second bearing 5 are rotary bearings, and they jointly support the rotating shaft 301, thereby reducing friction during rotation.

[0034] The housing 102 includes a first surface 1011 that surrounds and forms a receiving space 101. The stator 2 includes a coil 201, which is spaced around the magnet 302. The coil 201 is fixed to the first surface 1011 by adhesive, and the surface roughness of the first surface 1011 is 0.05-0.2 μm.

[0035] In this embodiment of the invention, referring to Figures 4, 6, and 7, the coil 201 is directly bonded to the first surface 1011, eliminating the need for an insulating layer or insulating tape between the coil 201 and the housing 102. This not only facilitates motor miniaturization and simplifies the structure but also effectively reduces magnetic leakage, resulting in higher torque performance for the motor 10. Furthermore, when the motor has the same dimensions, the thickness of the coil 201 can be increased, thereby improving magnetic field performance and further enhancing motor torque performance. Simultaneously, the surface roughness of the first surface 1011 is set to 0.05-0.2 μm to ensure that the coil 201 is not scratched by the first surface 1011 when bonded to it with adhesive, effectively improving product yield.

[0036] In an embodiment of the present invention, the first surface 1011 is subjected to electropolishing treatment for 3-5 seconds, with a current parameter of 5.5-55 AS / dm, resulting in a surface roughness of 0.05-0.2 μm for the first surface 1011. It is understood that in other embodiments, other methods can be used to polish the outer casing 1, as long as the coil 201 is not scratched by the inner wall of the casing 102.

[0037] Please refer to Figures 4, 6 and 7. The coil 201 is in the shape of a ring. The coil 201 includes a second surface 2011 facing the first surface 1011. The second surface 2011 is bonded and fixed to the first surface 1011 with glue.

[0038] Please refer to Figures 4, 6 and 7. The first surface 1011 can be a cylindrical surface, and the second surface 2011 can also be a cylindrical surface. The second surface 2011 and the first surface 1011 are bonded together with glue to minimize magnetic leakage and improve the torque performance of the motor 10.

[0039] Please refer to Figures 4 and 6. There is an axial gap between the coil 201 and the first cover 103, and an axial gap between the coil 201 and the second cover 104. This ensures that the first cover 103 and the second cover 104 will not press on the coil 201 during installation, thus preventing the coil 201 from deforming.

[0040] Please refer to Figures 4, 6, 8, and 11. The housing 102 includes a cylindrical shell portion 1026 and a bent portion 1022, which extends from one end of the shell portion 1026. A first mounting hole 1021 is provided on the bent portion 1022. The first cover 103 has a first flange portion 1031. The first flange portion 1031 protrudes toward the housing 102 and engages with the first mounting hole 1021, thereby making the assembly between the first cover 103 and the housing 102 more precise and facilitating accurate installation of the first cover 103 and the housing 102.

[0041] Please refer to Figures 4, 8 and 11. The first cover 103 also has a first positioning part 1032, which protrudes toward the housing 102. Furthermore, a positioning hole 1023 is provided on the bent part 1022. The positioning hole 1023 is inserted and engaged with the first positioning part 1032, which not only makes the assembly between the first cover 103 and the housing 102 more precise, but also plays an anti-rotation role, preventing the first cover 103 from rotating relative to the housing 102, further improving the assembly accuracy and making the structure of the motor 10 more stable.

[0042] As an optional implementation, referring to Figures 4, 8, and 11, there may be one first positioning part 1032, and correspondingly, one positioning hole 1023. In other implementations, there may be multiple first positioning parts 1032, and correspondingly, multiple positioning holes 1023. The first positioning parts 1032 and the positioning holes 1023 are connected in a one-to-one interlocking manner, further improving assembly accuracy and anti-rotation effect. The specific choice depends on the actual situation. As an example, all the first positioning parts 1032 may be evenly distributed around the circumference of the first flange 1031, or all the first positioning parts 1032 may be distributed in other forms, which will not be elaborated here.

[0043] It is understood that in other embodiments, the first positioning part 1032 may also be other structures, as long as the first positioning part 1032 and the housing 102 cooperate to make the assembly between the first cover 103 and the housing 102 more precise and avoid the first cover 103 from rotating relative to the housing 102. This will not be elaborated here.

[0044] Please refer to Figures 4, 6, 9, 10, and 12. The end of the housing 102 that mates with the second cover 104 has a second mounting hole 1024. The second cover 104 includes a second flange 1041 that protrudes toward the housing 102. The second flange 1041 engages with the second mounting hole 1024, thereby making the assembly between the second cover 104 and the housing 102 more precise and facilitating accurate installation of the second cover 104 and the housing 102.

[0045] Specifically, the coil 201 can be mounted to the first surface 1011 of the housing 102 through the first mounting hole 1021 or the second mounting hole 1024.

[0046] Please refer to Figures 3, 9 and 12. The second cover 104 also includes a second positioning part 1042. The second positioning part 1042 protrudes toward the housing 102 and is inserted into the housing 102. This not only makes the assembly between the second cover 104 and the housing 102 more precise, but also plays an anti-rotation role, preventing the second cover 104 from rotating relative to the housing 102, further improving the assembly accuracy and making the structure of the motor 10 more stable.

[0047] Specifically, the second positioning part 1042 protrudes from the circumferential surface of the second flange part 1041, and the end of the housing 102 that mates with the second cover 104 is also provided with a first positioning groove 1025, which is located at the opening of the second mounting hole 1024.

[0048] There can be one second positioning part 1042, and correspondingly, there is also one first positioning groove 1025. Optionally, there can be multiple second positioning parts 1042, and correspondingly, there can be multiple first positioning grooves 1025. Furthermore, the number of first positioning grooves 1025 is equal to the number of second positioning parts 1042, and the second positioning parts 1042 and the first positioning grooves 1025 are inserted and fitted in a one-to-one correspondence. All the second positioning parts 1042 can be evenly distributed around the second flange 1041, or all the second positioning parts 1042 can be distributed in other forms, which will not be elaborated here.

[0049] Referring to Figures 1 to 3, 5, 6, 8, and 10, the motor 10 also includes a circuit board 6. The circuit board 6 can be electrically connected to the coil 201, thereby supplying power to the coil 201. The circuit board 6 can be fixed to the housing 1, thereby making the electrical connection between the circuit board 6 and the coil 201 more stable. In this embodiment, the circuit board 6 can be fixed to the second cover 104.

[0050] Please refer to Figure 6. The circuit board 6 is located outside the receiving space 101. Please refer to Figures 1 to 3, 8 to 10, and Figure 12. The end of the second cover 104 away from the housing 102 has a third positioning part 1043. The third positioning part 1043 protrudes towards the circuit board 6. The circuit board 6 has a second positioning groove 601. The second positioning groove 601 and the third positioning part 1043 are inserted and engaged, which not only makes the assembly between the second cover 104 and the circuit board 6 more precise, but also plays an anti-rotation role, preventing the second cover 104 and the circuit board 6 from rotating relative to each other, further improving the assembly accuracy and making the structure of the motor 10 more stable. It should be noted that there can be one, two, or even more third positioning parts 1043. This will not be elaborated here, as long as the second positioning groove 601 and the third positioning part 1043 correspond one-to-one, so that the second cover 104 and the circuit board 6 can be precisely assembled and prevent the second cover 104 and the circuit board 6 from rotating relative to each other.

[0051] The above description is merely an embodiment of the present invention. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements all fall within the protection scope of the present invention.

Claims

1. An electric machine comprising: The motor comprises a housing with a receiving space, a stator and a rotor received in the receiving space, the rotor being rotatable relative to the stator, the housing comprising a first surface surrounding the receiving space, the rotor comprising a rotating shaft rotatable relative to the housing and a magnet fixed to the rotating shaft, and the stator comprising a coil surrounding the magnet, the coil being fixed to the first surface, characterized in that the coil is fixed to the first surface by adhesive bonding, and the first surface has a surface roughness of 0.05-0.2 μm.

2. The electric machine of claim 1, wherein, The first surface is processed by electrolytic polishing, the electrolytic polishing has a duration of 3-5 s and a current parameter of 5.5-55 AS / dm.

3. The electric machine of claim 1, wherein, The coil is annular, the coil comprises a second surface facing the first surface, and the second surface is fixed to the first surface by adhesive bonding.

4. The electric machine of claim 1, wherein, The housing comprises a hollow shell with two open ends, a first cover and a second cover respectively covering the two ends of the shell, the shell, the first cover and the second cover jointly defining the receiving space, and the first surface is arranged on the shell.

5. The electric machine of claim 4, wherein, One end of the rotating shaft is fixed to the first cover by a first bearing, and the other end of the rotating shaft is fixed to the second cover by a second bearing, and the rotating shaft is rotatably connected to the first bearing and the second bearing respectively.

6. The electric machine of claim 4, wherein, The coil has a gap in the axial direction with respect to the first cover, and the coil has a gap in the axial direction with respect to the second cover.

7. The electric machine of claim 4, wherein, The first cover comprises a first flange portion and a first positioning portion protruding towards the shell respectively, the first positioning portion is located on the outer circumferential side of the first flange portion, the shell comprises a cylindrical shell portion and a bent portion bent and extended from one end of the shell portion, the bent portion is provided with a first mounting hole and a positioning hole, the first mounting hole is inserted and matched with the first flange portion, and the positioning hole is inserted and matched with the first positioning portion.

8. The electric machine of claim 4, wherein, The second cover comprises a second flange portion protruding towards the shell and a second positioning portion protruding on the circumferential surface of the second flange portion, and the shell has a second mounting hole and a first positioning groove at the end matched with the second cover, the second mounting hole is inserted and matched with the second flange portion, and the first positioning groove is located at the hole opening of the second mounting hole and is inserted and matched with the second positioning portion.

9. The electric machine of claim 4, wherein, The motor further comprises a circuit board electrically connected to the coil, and the circuit board is fixed to the second cover.

10. The electric machine of claim 9, wherein, The circuit board is arranged outside the receiving space, one end of the second cover away from the shell has a third positioning portion protruding towards the circuit board, and the circuit board is provided with a second positioning groove inserted and matched with the third positioning portion.

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