Motor and oral care device

Abstract

The embodiment of the utility model discloses a motor and oral care equipment. The motor comprises a driving assembly, a circuit board and a detection assembly. The driving assembly comprises a stator and a rotor, the stator comprises a stator shell and a stator winding arranged in the stator shell, and the stator winding is used for driving the rotor to rotate. The circuit board is arranged in the stator shell, the circuit board is provided with a connecting terminal, and the power connection end of the stator winding is electrically connected with the connecting terminal. The detection assembly comprises a magnetic induction piece and a magnetic piece, the magnetic induction piece is connected with a circuit board, one of the circuit board and the magnetic piece is connected with the stator, the other one of the circuit board and the magnetic piece is connected with the rotor, and the magnetic induction piece and the magnetic piece are arranged in a spaced mode and used for inducing the magnetic field of the magnetic piece. According to the technical scheme, the detection error of the detection element can be reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oral cleaning, in particular to a motor and an oral care device. BACKGROUND

[0002] At present, oral care devices, such as toothbrushes, usually adopt a servo motor as a driving component, which allows the oral care device to have a larger cleaning angle.

[0003] In the related art, the servo motor includes a stator shell and a rotor, the stator shell is provided with an end cover, a circuit board is arranged on the end cover, and a detection element, such as a Hall detection element, for detecting the rotating state of the rotor is further arranged on the circuit board. In this way, the error of the detection element is large. UTILITY MODEL CONTENT

[0004] Embodiments of the present application provide a motor and an oral care device, aiming to reduce the detection error of the detection element.

[0005] In an aspect, the present application provides a motor, comprising:

[0006] a driving assembly comprising a stator and a rotor, the stator comprising a stator shell and a stator winding arranged in the stator shell, the stator winding being configured to drive the rotor to rotate;

[0007] a circuit board arranged in the stator shell, the circuit board being provided with a connecting terminal, and an electrical connection terminal of the stator winding being electrically connected to the connecting terminal; and

[0008] a detection assembly comprising a magnetic induction element and a magnetic element, one of the circuit board and the magnetic element being connected to the stator, and the other being connected to the rotor, the magnetic induction element being arranged apart from the magnetic element and configured to induce a magnetic field of the magnetic element.

[0009] Optionally, along an axial direction of the motor, the magnetic element is closer to the magnetic induction element than the stator winding; and / or,

[0010] the connecting terminal is arranged on a side of the circuit board away from the magnetic element.

[0011] Optionally, along an axial direction of the motor, the circuit board and the magnetic element are arranged apart, and a projection of the magnetic induction element at least partially overlaps a projection of the magnetic element.

[0012] Optionally, the magnetic induction element and the magnetic element are arranged on opposite sides of the circuit board.

[0013] Optionally, the circuit board is connected to the stator and is provided with a clearance hole, the rotor comprises a rotor core and a rotor magnetic member, the rotor magnetic member is arranged at the outer periphery of the rotor core, the magnetic member is connected to the rotor magnetic member, and the rotor core is arranged through the clearance hole.

[0014] The inner diameter of the clearance hole is greater than the outer diameter of the rotor core, and the hole wall of the clearance hole is arranged in a spaced manner from the rotor core.

[0015] Optionally, the stator further comprises:

[0016] The mounting bracket is arranged in the stator shell, the stator winding is arranged around the mounting bracket, one of the mounting bracket and the circuit board is provided with a positioning protrusion, and the other is provided with a positioning groove, and the positioning protrusion is arranged through the positioning groove.

[0017] Optionally, the mounting bracket is provided with at least two positioning protrusions, and the at least two positioning protrusions are arranged in a spaced manner along the circumference of the mounting bracket.

[0018] At least one side of each mounting bracket is provided with a stepped surface, the positioning protrusion is arranged on the stepped surface, and the stepped surface abuts against the circuit board.

[0019] Optionally, the at least two stepped surfaces are arranged in a coplanar manner, and the plane where the at least two stepped surfaces are located is perpendicular to the axial direction of the motor.

[0020] Optionally, the circuit board is further provided with a clamping groove, and the mounting bracket is further provided with a clamping buckle, the clamping buckle is partially arranged out of the clamping groove, and the part of the clamping buckle arranged out of the clamping groove and the stepped surface clamp the two surfaces of the circuit board which are opposite to each other in the axial direction of the motor.

[0021] Optionally, the rotor comprises a rotor core and a rotor magnetic member, the rotor magnetic member is arranged at the outer periphery of the rotor core, and the magnetic member is arranged at one end of the rotor magnetic member close to the circuit board.

[0022] Optionally, the magnetic member and the rotor magnetic member are an integral component; or,

[0023] The magnetic member and the rotor magnetic member are bonded.

[0024] Optionally, in the axial direction of the motor, the projection of the magnetic member coincides with the projection of the rotor magnetic member, or the projection of the magnetic member is located in the projection of the rotor magnetic member.

[0025] Optionally, the magnetic member is connected to the stator and is provided with a clearance hole, the rotor comprises a rotor core and a rotor magnetic member, the rotor magnetic member is arranged at the outer periphery of the rotor core, the circuit board is electrically connected to the rotor magnetic member through a wire, and the rotor core is arranged in the clearance hole.

[0026] The inner diameter of the clearance hole is greater than the outer diameter of the rotor core, and the hole wall of the clearance hole is arranged in a spaced manner from the rotor core.

[0027] Optionally, the motor further comprises:

[0028] A limiting member is connected to the stator and is arranged on the rotation path of the rotor magnetic member or the rotor core, and is used for limiting the rotation range of the rotor.

[0029] Optionally, the magnetic induction member is a Hall element.

[0030] Optionally, the stator shell is provided with a mounting cavity and an assembly opening communicating with the mounting cavity, the driving assembly and the detection assembly are arranged in the mounting cavity, and the motor further comprises:

[0031] An end cover is connected to the stator shell and shields at least part of the assembly opening, and the end cover is a metal member.

[0032] Optionally, the magnetic member is located on the side of the circuit board away from the end cover.

[0033] Optionally, along the axial direction of the motor, the distance between the end cover and the magnetic induction member is L, and the relationship L≤5mm is satisfied.

[0034] Optionally, the side of the circuit board facing the end cover is provided with a terminal, the end cover is provided with a wire hole communicating between the outside and the mounting cavity, and the wire hole and the terminal are arranged in a facing manner in the axial direction of the motor.

[0035] Another aspect of the embodiment of the present application provides an oral care device, comprising:

[0036] A handle comprising the motor according to any one of the above.

[0037] A care member is connected to the motor shaft of the motor.

[0038] Based on the above embodiment, the circuit board and the detection assembly in the embodiment of the application are arranged in the stator shell, the magnetic induction piece is arranged on the circuit board, and the circuit board and the magnetic piece are directly connected with the stator or the rotor respectively, without the need of additionally arranging a mounting seat to mount the circuit board. In this way, the number of parts can be reduced, the length of the motor can be reduced, the assembly error of the circuit board can be reduced, the alignment of the magnetic induction piece and the magnetic piece is more accurate, the calibration difficulty is reduced, and thus the cost can be saved and the detection accuracy of the detection assembly to the rotor state can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0040] Figure 1 FIG. 1 is a structural schematic diagram of a motor in an embodiment of the present application;

[0041] Figure 2 FIG. 2 is an exploded structural schematic diagram of the motor in FIG. 1 from another perspective; Figure 1

[0042] Figure 3 FIG. 3 is a cross-sectional structural schematic diagram of the motor in FIG. 1; Figure 1

[0043] Figure 4 FIG. 4 is an exploded structural schematic diagram of a stator in an embodiment of the present application;

[0044] Figure 5 FIG. 5 is an enlarged structural schematic diagram of position A in FIG. 4; Figure 3

[0045] Figure 6 FIG. 6 is a structural schematic diagram of a circuit board in an embodiment of the present application;

[0046] Figure 7 FIG. 7 is a structural schematic diagram of a mounting bracket in an embodiment of the present application;

[0047] Figure 8 FIG. 8 is a structural schematic diagram of a rotor and a circuit board in an embodiment of the present application;

[0048] Figure 9 FIG. 9 is a cross-sectional structural schematic diagram of the motor in FIG. 1 from another perspective;

[0049] Figure 10 FIG. 10 is an enlarged structural schematic diagram of position B in FIG. 9. Figure 9

[0050] ​​​​Reference numerals: 100, motor; 101, drive assembly; 10, stator; 11, stator housing; 111, mounting cavity; 113, assembly port; 13, mounting bracket; 13a, first bracket; 13b, second bracket; 131, mounting part; 131a, wire guide groove; 1311, outer baffle; 1313, inner baffle; 1315, snap fastener; 1316, hook; 1317, positioning protrusion; 1319. Stepped surface; 133, winding section; 133a, wire slot; 15, stator core; 17, stator winding; 30, rotor; 31, rotor core; 33, rotor magnetic component; 50, circuit board; 51, card slot; 53, positioning slot; 55, clearance hole; 70, detection component; 71, magnetic induction component; 73, magnetic component; 80, shaft; 90, end cover; 91, wire through hole; 93, bearing; 200, wire. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0052] One embodiment of this application provides an oral care device, which may be an electric toothbrush, etc., including a handle and a care component. The handle includes a motor disposed therein and a partially exposed rotating shaft, the motor being used to drive the rotating shaft to rotate.

[0053] Combination Figures 1 to 3 The motor 100 proposed in this embodiment includes a drive assembly 101, a circuit board 50, and a detection assembly 70. The drive assembly 101 drives the rotating shaft 80 to rotate under the control of the circuit board 50, and the detection assembly 70 detects the operating status of the drive assembly 101. The care device is connected to the exposed part of the rotating shaft 80 and can rotate with the rotating shaft 80. The care device can be a brush head, which can clean the oral cavity by rotating with the rotating shaft 80.

[0054] Specifically, in this embodiment of the application, the drive assembly 101 includes a stator 10 and a rotor 30. The stator 10 is used to drive the rotor 30 to rotate and defines a rotation space. The rotor 30 is rotatably disposed in the rotation space and is connected to the rotating shaft 80, so that when the rotor 30 rotates, it drives the rotating shaft 80 to rotate.

[0055] like Figure 3As shown, the stator 10 comprises a stator housing 11, a stator core 15 and a stator magnetic element, and the rotor 30 comprises a rotor core 31 and a rotor magnetic element 33. The stator housing 11 is provided with a mounting cavity 111, the stator core 15 is arranged in the mounting cavity 111, and the stator magnetic element is connected to the stator core 15. The stator core 15 extends along the axial direction of the motor 100 and is substantially cylindrical, thereby defining a rotating space in the middle of the stator core 15, the rotor core 31 is rotatably arranged in the rotating space, and the rotor magnetic element 33 is connected to the rotor core 31. The rotating shaft 80 is connected to at least one of the rotor core 31 and the rotor magnetic element 33 to rotate with the rotor 30.

[0056] It should be noted that the axial direction of the motor 100 in the present application can be understood as the direction perpendicular to the rotating direction of the rotating shaft 80, and the motor 100 as a whole presents a long cylindrical structure. In some related technologies, the circuit board is arranged outside the stator housing, and the rotating shaft is exposed from one end of the stator housing, and the circuit board is usually arranged on the other end side of the exposed part of the stator housing away from the rotating shaft. For example, the related technology adopts a mounting seat connected to one end of the stator housing, and the circuit board is mounted on the mounting seat. It can be seen that the circuit board is arranged outside the stator housing, and the additional mounting seat and other structures will undoubtedly increase the occupied space of the motor, making the overall length of the motor along the axial direction larger, affecting the miniaturization design of the motor and the oral care device.

[0057] Therefore, in combination with Figure 3 and Figure 4 , in the embodiment of the present application, the stator 10 further comprises a mounting bracket 13 mounted in the stator housing 11. The mounting bracket 13 is arranged in the stator core 15, and the stator magnetic element is connected to the mounting bracket 13. Specifically, a plurality of mounting grooves are provided on the stator core 15, the mounting grooves are arranged in a circumferential direction of the stator core 15 and are all connected to the rotating space in the middle of the stator core 15, and part of the mounting bracket 13 is arranged in the mounting grooves. In some structures in which the stator magnetic element is a stator winding 17, the stator winding 17 is wound on the mounting bracket 13.

[0058] In the embodiment of the present application, the mounting bracket 13 is provided with a mounting portion 131 at one end along the axial direction of the motor 100, and the mounting portion 131 is also located in the stator housing 11, and the circuit board 50 is connected to the mounting portion 131. In combination with Figure 3 , the mounting portion 131 is exposed at one end of the stator core 15 and extends along the axial direction of the motor 100, and the circuit board 50 is connected to the mounting portion 131 by one or more of clamping, screwing and bonding. From the above structure, the circuit board 50 is directly connected to the stator 10 and arranged in the stator housing 11.

[0059] Therefore, in the technical scheme of the present application, the stator housing 11 is provided with a mounting bracket 13, the mounting bracket 13 is provided with a mounting portion 131, the circuit board 50 is fixed in the stator housing 11 through the mounting portion 131, so that the circuit board 50 is installed in the space inside the stator housing 11, the space utilization of the stator housing 11 is improved, compared with the related art, the circuit board 50 of the present application is directly fixed through the mounting bracket 13 of the stator 10, without the need for an additional mounting seat, the number of parts is reduced, and the additional mounting seat can be avoided to increase the length of the motor 100, so that the structure of the motor 100 of the present application is more compact, the length dimension is reduced, and the miniaturization design of the motor 100 and the oral care device using the motor 100 is facilitated.

[0060] As shown in Figures 4 to 7 In some embodiments, the mounting bracket 13 includes a first bracket 13a and a second bracket 13b, the first bracket 13a and the second bracket 13b are independently formed, wherein the first bracket 13a is arranged at one end of the stator 10 along the axial direction of the motor 100, the second bracket 13b is arranged at the other end of the stator 10 along the axial direction of the motor 100 and is spaced apart from the first bracket 13a, and the stator magnetic member is connected to the first bracket 13a and the second bracket 13b. The mounting portion 131 is arranged on the side of the first bracket 13a away from the second bracket 13b and exposed outside the stator core 15. In these embodiments, the mounting portion 131 serves to fix and mount the circuit board 50, and the mounting portion 131 is arranged on the first bracket 13a, while the second bracket 13b does not need to fix and mount the circuit board 50, so the second bracket 13b does not have the mounting portion 131. Since the mounting portion 131 extends along the axial direction of the motor 100 relative to the mounting bracket 13, and the mounting portion 131 is arranged on the first bracket 13a only, instead of using a completely symmetrical first bracket 13a and second bracket 13b, the excessive occupation of the internal space of the stator housing 11 can be avoided, and the length dimension of the motor 100 can be avoided to be increased. In addition, the first bracket 13a and the second bracket 13b arranged in a spaced apart manner can save materials, reduce costs, reduce the weight of the motor 100, and facilitate the lightweight design of the motor 100.

[0061] Of course, in some other embodiments of the present application, the mounting bracket 13 can also adopt an integrated structure design to improve the structural integrity. The present application does not limit this.

[0062] For some stator magnetic members in the form of stator windings 17, the mounting bracket 13 further includes a winding portion 133 connected to the side of the mounting portion 131 away from the circuit board 50, the winding portion 133 is arranged in the mounting groove and defines a wire receiving groove 133a inside, and part of the stator winding 17 is located in the wire receiving groove 133a, so as to improve the stability of the stator winding 17.

[0063] For the fitting relationship between the mounting portion 131 and the circuit board 50, optionally, one of the mounting bracket 13 and the circuit board 50 is provided with a buckle 1315, and the other is provided with a clamping groove 51, the buckle 1315 is clamped in the clamping groove 51, thereby realizing the connection of the mounting portion 131 and the buckle 1315 of the circuit board 50, facilitating disassembly and assembly; or the one of the mounting bracket 13 and the circuit board 50 can be provided with a positioning protrusion 1317, and the other is provided with a positioning groove 53, the positioning protrusion 1317 is arranged in the positioning groove 53, so as to realize the positioning fitting of the mounting portion 131 and the circuit board 50, and the positioning of the circuit board 50 and the mounting portion 131 during installation can be realized, and the installation efficiency and the positioning accuracy are improved.

[0064] Please refer to Figure 5 and Figure 6 In an embodiment of the present application, the circuit board 50 is provided with the clamping groove 51 and the positioning groove 53, and the mounting portion 131 is provided with the buckle 1315 and the positioning protrusion 1317, the buckle 1315 is clamped in the clamping groove 51, and the positioning protrusion 1317 is arranged in the positioning groove 53.

[0065] Exemplarily, the mounting portion 131 includes an inner baffle 1313 and an outer baffle 1311 which are arranged at intervals along the radial direction of the motor 100, the inner baffle 1313 is closer to the central axis of the motor 100 than the outer baffle 1311, and a wire passing groove 131a is defined between the inner baffle 1313 and the outer baffle 1311. The wire passing groove 131a is communicated with the wire receiving groove 133a, the stator winding 17 is wound around the wire passing groove 131a and the wire receiving groove 133a, and the inner baffle 1313 and the outer baffle 1311 can guide and limit the wires 200 of the stator winding 17, which not only improves the winding efficiency during winding, but also improves the stability of the stator winding 17.

[0066] In the embodiment, at least one of the inner baffle 1313 and the outer baffle 1311 is provided with a buckle 1315, and at least one of the inner baffle 1313 and the outer baffle 1311 is provided with a positioning protrusion 1317, the buckle 1315 is clamped in the clamping groove 51, and the positioning protrusion 1317 penetrates the positioning groove 53. Understandably, the buckle 1315 and the positioning protrusion 1317 can be both arranged on the inner baffle 1313, or can be both arranged on the outer baffle 1311, or the positioning protrusion 1317 can be arranged on the inner baffle 1313 and the buckle 1315 can be arranged on the outer baffle 1311, or the positioning protrusion 1317 can be arranged on the outer baffle 1311 and the buckle 1315 can be arranged on the inner baffle 1313, and the embodiment of the application does not limit this. In this way, in the embodiment, the positioning protrusion 1317 of the mounting portion 131 is positioned and matched with the positioning groove 53 on the circuit board 50, which facilitates installation and positioning, improves installation efficiency and the positional accuracy of the circuit board 50, and at the same time, the buckle 1315 of the mounting portion 131 is clamped and matched with the clamping groove 51 on the circuit board 50, which makes the disassembly and assembly of the circuit board 50 to the mounting portion 131 more convenient and improves the disassembly and assembly efficiency. Moreover, in the embodiment, the cooperation of the buckle 1315 and the clamping groove 51 and the cooperation of the positioning protrusion 1317 and the positioning groove 53 can realize the fixation of the circuit board 50 to the mounting portion 131 in the circumferential direction and the axial direction of the motor 100, thereby improving the stability of the circuit board 50.

[0067] Understandably, in other embodiments of the application, the positioning groove 53 and the clamping groove 51 can be arranged on the mounting portion 131, and the positioning protrusion 1317 and the buckle 1315 can be arranged on the circuit board 50, which can also realize the fixed connection of the circuit board 50 and the mounting portion 131. In the previous embodiment of the application, the circuit board 50 is provided with the clamping groove 51 and the positioning groove 53, and the mounting portion 131 is provided with the buckle 1315 and the positioning protrusion 1317, so that the complexity of the circuit board 50 can be reduced, and the molding of the mounting bracket 13 and the circuit board 50 is facilitated. The following continues to explain and describe the structure in which the circuit board 50 is provided with the clamping groove 51 and the positioning groove 53, and the mounting portion 131 is provided with the buckle 1315 and the positioning protrusion 1317.

[0068] Please refer to Figure 6 and Figure 7In an embodiment, the number of the outer baffles 1311 and the inner baffles 1313 is at least two, the at least two outer baffles 1311 are arranged in the circumferential direction of the mounting portion 131, the at least two inner baffles 1313 are arranged in the circumferential direction of the mounting portion 131, and the at least two outer baffles 1311 and the at least two inner baffles 1313 are arranged in one-to-one correspondence, and the buckles 1315 and the positioning protrusions 1317 are arranged in the circumferential direction of the mounting portion 131. Among them, the plurality of spaced outer baffles 1311 and the plurality of spaced inner baffles 1313 not only facilitate the molding of the buckle 1315 and the positioning protrusion 1317, but also can reduce the material and reduce the weight of the motor 100. It is worth mentioning that the mounting portion 131 can also be provided with a single annular outer baffle 1311 and a single annular inner baffle 1313 structure, and the present application embodiment does not limit this.

[0069] In some examples, the buckle 1315 and the positioning protrusion 1317 are arranged on the outer baffle 1311. For example, the buckle 1315 and the positioning protrusion 1317 are arranged on different outer baffles 1311, and further, the number of buckles 1315 and the number of positioning protrusions 1317 are both multiple, and the plurality of buckles 1315 and the plurality of positioning protrusions 1317 are arranged alternately in the circumferential direction of the mounting portion 131, and correspondingly, the plurality of clamping grooves 51 and the plurality of positioning grooves 53 on the circuit board 50 are also arranged alternately in the circumferential direction of the circuit board 50, which can improve the uniformity of the clamping and positioning of the circuit board 50 and the mounting portion 131, thereby improving the structural stability. In addition, since the lead wire 200 of the stator winding 17 is easy to contact the inner baffle 1313 during winding, arranging the buckle 1315 and the positioning protrusion 1317 on the outer baffle 1311 can effectively avoid the interference of the buckle 1315 and the positioning protrusion 1317 with the winding process, ensure smooth winding, and avoid damaging the lead wire 200.

[0070] Further, in the radial direction of the motor 100, the outer baffle 1311 is arranged in the inner baffle 1313, which avoids interference during the installation of the stator core 15 and the mounting bracket 13 into the stator shell 11, and improves the smoothness of assembly.

[0071] In the embodiments where the number of the outer baffle 1311 and the inner baffle 1313 is at least two, the length h2 of the outer baffle 1311 is greater than the length h1 of the inner baffle 1313 in the axial direction of the motor 100. In these embodiments, the buckle 1315 and the positioning protrusion 1317 are both arranged on the outer baffle 1311, which makes the length of the outer baffle 1311 greater. On the one hand, this makes the buckle 1315 and the positioning protrusion 1317 farther away from the winding slot in the axial direction of the motor 100, avoiding interference between the buckle 1315 and the positioning protrusion 1317 and the wire 200 during winding, thereby avoiding wire breakage and paint wear. On the other hand, the longer outer baffle 1311 has better deformation ability and better elasticity, which can be elastically adjusted adaptively during installation, absorbing manufacturing tolerances, improving the connection stability of the circuit board 50 and the mounting portion 131, and being conducive to keeping the circuit board 50 horizontal.

[0072] Further, in the circumferential direction of the motor 100, the width d2 of the outer baffle 1311 is less than the width d1 of the inner baffle, thereby further increasing the deformation ability of the outer baffle 1311 and further improving the elasticity of the outer baffle 1311, thereby improving the ability of the outer baffle 1311 to absorb manufacturing tolerances and improving the compatibility of the mounting portion 131.

[0073] Please refer to Figure 5 and Figure 7 In a specific embodiment, one end of the buckle 1315 is fixed, and the other end has a clamping hook 1316, which is a hook-shaped structure protruding towards the side of the buckle 1315. The clamping groove 51 is a groove structure penetrating in the thickness direction of the circuit board 50, and in this embodiment, the thickness direction of the circuit board 50 is parallel to the axial direction of the motor 100. When the buckle 1315 cooperates with the clamping groove 51, the part of the buckle 1315 that penetrates out of the clamping groove 51 is the clamping hook, which connects the circuit board 50. The clamping hook 1316 can limit the movement of the circuit board 50 in the axial direction of the motor 100, and the one-to-one corresponding cooperation of the buckle 1315 and the clamping groove 51 can also limit the movement of the circuit board 50 relative to the mounting portion 131 in the circumferential direction of the motor 100, so that the connection stability of the circuit board 50 is improved while facilitating disassembly.

[0074] Further, the clamping hook 1316 is located on the side of the buckle 1315 away from the winding slot, further avoiding interference between the clamping hook 1316 and the wire 200 during winding, thereby avoiding wire breakage and paint wear.

[0075] For the positioning protrusion 1317, the positioning protrusion 1317 and the buckle 1315 can be arranged on different outer baffles 1311. Alternatively, the positioning protrusion 1317 can be in the shape of a long strip extending in the axial direction of the motor 100, and the positioning groove 53 is a groove structure on the circuit board 50 corresponding to the cross-sectional shape of the positioning protrusion 1317. For example, the cross-sectional shape of the positioning protrusion 1317 is rectangular, and the positioning groove 53 is a rectangular groove to reduce or avoid the loosening of the positioning protrusion 1317 in the positioning groove 53. The positioning groove 53 can also be a groove structure extending through the thickness of the circuit board 50, and the positioning protrusion 1317 partially penetrates the positioning groove 53.

[0076] Further, the positioning protrusion 1317 is provided with a hot melt portion, and the hot melt portion is hot melt connected with the circuit board 50. For example, the hot melt portion is the part of the positioning protrusion 1317 located in the positioning groove 53. During installation, hot melt adhesive is filled between the hot melt portion and the groove wall of the positioning groove 53 to fixedly connect the positioning protrusion 1317 with the circuit board 50, improve the connection tightness of the circuit board 50 with the mounting portion 131, and improve the connection reliability.

[0077] Please continue to refer to Figure 5 and Figure 7 In some embodiments, at least one of the inner baffle 1313 and the outer baffle 1311 is configured to form a stepped surface 1319, the buckle 1315 penetrates the card groove 51, and the buckle 1315 and the stepped surface 1319 clamp the two surfaces of the circuit board 50 opposite in the axial direction of the motor 100 to sufficiently limit the movement of the circuit board 50 relative to the mounting portion 131 in the axial direction of the motor 100, thereby improving the stability of the circuit board 50.

[0078] The number of stepped surfaces 1319 is at least two. The at least two stepped surfaces 1319 can be arranged on the inner baffle 1313, on the outer baffle 1311, or on both the inner baffle 1313 and the outer baffle 1311. In this embodiment, the number of stepped surfaces 1319 is not limited. The at least two stepped surfaces 1319 are coplanar, and the at least two stepped surfaces 1319 are perpendicular to the axial direction of the motor 100. In this way, the circuit board 50 placed on the at least two stepped surfaces 1319 can be kept horizontal, and the circuit board 50 has sufficient contact area with the stepped surface 1319, thereby improving the stability of the circuit board 50 and avoiding the circuit board 50 from being tilted, so that the circuit board 50 is kept perpendicular to the rotating shaft 80 and avoids interfering with the rotating shaft 80.

[0079] In an embodiment, the stepped surface 1319 is arranged on the outer baffle 1311, and in the axial direction of the motor 100, the stepped surface 1319 is flush with the top surface of the inner baffle 1313, or the stepped surface 1319 is closer to the circuit board 50 than the top surface of the inner baffle 1313. In this way, the inner baffle 1313 can be prevented from lifting the circuit board 50, thereby causing instability of the circuit board 50.

[0080] Optionally, in the structure form that the positioning protrusion 1317 is arranged on the outer baffle 1311, the step surface 1319 and the positioning protrusion 1317 can be arranged on the same outer baffle 1311, and the positioning protrusion 1317 protrudes from the step surface 1319. In combination Figure 7 , the positioning protrusion 1317 is located in the middle of the outer baffle 1311, and the two step surfaces 1319 are formed on the two sides of the positioning protrusion 1317. In this way, the positioning protrusion 1317 and the step surface 1319 are integrated on the same outer baffle 1311, which simplifies the structure of the mounting portion 131 and makes the overall structure of the mounting portion 131 and the circuit board 50 more compact, which is conducive to reducing the size of the motor 100. Of course, the step surface 1319 and the positioning protrusion 1317 can also be arranged on different outer baffles 1311, which is not limited herein.

[0081] After the circuit board 50 is installed, the stator winding 17 is electrically connected with the circuit board 50, and under the control of the circuit board 50, the rotor 30 rotates relative to the stator 10. The detection assembly 70 is used for detecting the rotation state of the rotor 30. In the related art, the detection element in the detection assembly is installed on the circuit board, and the circuit board is installed on the mounting seat. Due to the error of the circuit board installed on the mounting seat and the error of the mounting seat connected with the stator shell, the cumulative error is large, the detection element is not accurately aligned, the detection error is large, and the subsequent calibration work is difficult.

[0082] Therefore, please combine Figures 8 to 10 , in some embodiments of the present application, the circuit board 50 is arranged in the stator shell 11, and the detection assembly 70 includes a magnetic induction piece 71 and a magnetic piece 73. The magnetic induction piece 71 is connected with the circuit board 50, the circuit board 50 is connected with the stator 10, the magnetic piece 73 is connected with the rotor 30, and the magnetic induction piece 71 and the magnetic piece 73 are arranged in a spaced manner and are used for sensing the magnetic field of the magnetic piece 73. In this way, when the rotor 30 rotates, the magnetic induction piece 71 remains stationary, and the magnetic piece 73 relatively rotates. That is, the magnetic induction piece 71 and the magnetic piece 73 can relatively rotate, the magnetic induction piece 71 detects the position, rotation angle and other information of the rotor 30 by sensing the change of the magnetic field, so as to control the motor 100.

[0083] It can be understood that in the embodiments of the present application, the circuit board 50 and the detection assembly 70 are arranged in the stator shell 11, the magnetic induction piece 71 is arranged on the circuit board 50, and the circuit board 50 and the magnetic piece 73 are directly connected with the stator 10 and the rotor 30 respectively, without the need to additionally arrange a mounting seat to install the circuit board 50. In this way, not only the number of parts can be reduced and the length of the motor 100 can be reduced, but also the assembly error of the circuit board 50 can be reduced, the alignment of the magnetic induction piece 71 and the magnetic piece 73 is more accurate, the calibration difficulty is reduced, thereby saving cost and improving the detection accuracy of the detection assembly 70 on the state of the rotor 30.

[0084] Specifically, in combination with Figure 8 and Figure 9 , the circuit board 50 is connected to the mounting bracket 13, and a clearance hole 55 is arranged in the middle part. The rotor magnetic member 33 is arranged on the outer periphery of the rotor core 31, and the magnetic member 73 is connected to the rotor magnetic member 33. The rotor core 31 is connected to the rotating shaft 80, and optionally, part of the rotor core 31 can be integrated with the rotating shaft 80. The rotor core 31 (the rotating shaft 80) is arranged through the clearance hole 55. The inner diameter of the clearance hole 55 is larger than the outer diameter of the rotor core 31. The hole wall of the clearance hole 55 is arranged in a spaced manner with the rotor core 31, so as to avoid the influence of the circuit board 50 on the rotation of the electronic core.

[0085] Optionally, the magnetic induction member 71 is a Hall element, and the magnetic member 73 is a magnet. The Hall element detects the movement position of the rotor 30 by sensing the magnetic field strength of the magnet.

[0086] Please continue to refer to Figure 8 In some embodiments, the magnetic member 73 is arranged at one end of the rotor magnetic member 33 close to the circuit board 50, so as to shorten the distance between the magnetic member 73 and the magnetic induction member 71, and facilitate the detection of the magnetic induction member 71. In one embodiment, the magnetic member 73 is arranged in a ring shape and is sleeved on the outer periphery of the rotating shaft 80. In this way, the stator 10 drives the rotation of the rotor magnetic member 33, and the magnetic member 73 rotates with the rotor magnetic member 33. The magnetic member 73 serves as the basis for the detection of the magnetic induction member 71 and does not play a transmission role, and the structure is simple and effective. Optionally, the magnetic member 73 is bonded to the end side of the rotor magnetic member 33 close to the circuit board 50. In this way, the connection between the magnetic member 73 and the rotor magnetic member 33 is improved, and the assembly of the magnetic member 73 is facilitated. Of course, in other embodiments, the magnetic member 73 can also be an integral component with the rotor magnetic member 33. The position, angle, and other information of the rotor 30 are determined by the magnetic field of the integral structure of the magnetic member 73 and the rotor magnetic member 33 through the detection of the magnetic induction member 71.

[0087] In the embodiment of the present application, the projection of the magnetic member 73 coincides with the projection of the rotor magnetic member 33, or the projection of the magnetic member 73 is located in the projection of the rotor magnetic member 33 along the axial direction of the motor 100. That is, in the projection of the magnetic member 73 and the rotor magnetic member 33 along the axial direction of the motor 100, the outer contour of the magnetic member 73 is not greater than the outer contour of the rotor magnetic member 33. Since the air gap between the stator magnetic member and the rotor magnetic member 33 is small, if the size of the magnetic member 73 is too large, the magnetic member 73 may be scraped with the stator 10 during the rotation of the rotor 30 relative to the stator 10, which affects the normal movement of the motor 100. The size of the magnetic member 73 is limited in the embodiment of the present application to ensure the normal operation of the motor 100 and avoid interference.

[0088] Further, please refer to Figure 9In the embodiment, the magnetic member 73 is closer to the magnetic induction member 71 than the stator magnetic member along the axial direction of the motor 100, so that the magnetic field of the stator magnetic member can be reduced to interfere with the magnetic induction member 71, and the magnetic induction member 71 can focus on detecting the magnetic field change of the magnetic member 73, so as to ensure the detection accuracy of the detection assembly 70.

[0089] In some embodiments, the magnetic induction member 71 and the magnetic member 73 are arranged on the opposite sides of the circuit board 50. That is, the magnetic induction member 71 is arranged on the side of the circuit board 50 away from the magnetic member 73. It can be seen that the side of the circuit board 50 close to the magnetic member 73 is provided with the rotor core 31, the rotor magnetic member 33, the stator magnetic member, and the mounting bracket 13 and other structures, and the distance between the circuit board 50 and these structures is limited. Arranging the magnetic induction member 71 on the side of the circuit board 50 close to the magnetic member 73 not only has limited space, but also the magnetic induction member 71 is easy to interfere with the rotor core 31, the mounting bracket 13 and other structures, causing displacement or damage of the magnetic induction member 71, and the magnetic induction member 71 is more susceptible to the magnetic field interference of the stator magnetic member. In contrast, the side of the circuit board 50 away from the magnetic member 73 has fewer structures and a smoother surface. Arranging the magnetic induction member 71 on the side of the circuit board 50 away from the magnetic member 73 can avoid interference between the magnetic induction member 71 and other structures, and can also make the magnetic member 73 away from the stator magnetic member, further reducing the interference of the stator magnetic member on the magnetic induction member 71.

[0090] Further, the magnetic induction member 71 is closer to the central axis of the motor 100 than the clamping groove 51 and / or the positioning groove 53. In an embodiment, the circuit board 50 is provided with the clamping groove 51 and the positioning groove 53 for cooperating with the clamping buckle 1315 and the positioning protrusion 1317 of the mounting bracket 13, wherein the clamping buckle 1315 and the positioning protrusion 1317 of the mounting bracket 13 are arranged on the outer baffle 1311, that is, the clamping groove 51 and the positioning groove 53 are arranged close to the outer periphery of the circuit board 50. Please refer again to Figure 5 The magnetic member 73 is connected to the rotor magnetic member 33, and the projection of the magnetic member 73 on the circuit board 50 is closer to the center of the circuit board 50. The embodiment makes the magnetic induction member 71 closer to the central axis of the motor 100, that is, the distance between the magnetic induction member 71 and the magnetic member 73 is shortened, so that the detection is more accurate.

[0091] In the embodiment, the circuit board 50 and the magnetic member 73 are arranged at intervals along the axial direction of the motor 100, and the projection of the magnetic induction member 71 at least partially overlaps the projection of the magnetic member 73, so that the position of the magnetic induction member 71 and the magnetic member 73 can be aligned, the distance between the magnetic induction member 71 and the magnetic member 73 is further shortened, and the magnetic field decay of the magnetic member 73 is avoided to affect the detection accuracy.

[0092] In combination with the foregoing embodiments, to further ensure detection accuracy, at least one of the inner baffle 1313 and the outer baffle 1311 of the mounting portion 131 is configured with a stepped surface 1319, the buckle 1315 penetrates the clamping groove 51, and the buckle 1315 and the stepped surface 1319 clamp the two surfaces of the circuit board 50 opposite in the axial direction of the motor 100, so as to sufficiently limit the movement of the circuit board 50 in the axial direction of the motor 100 relative to the mounting portion 131, and improve the stability of the circuit board 50. Optionally, the number of stepped surfaces 1319 is at least two, and the at least two stepped surfaces 1319 can be arranged on the inner baffle 1313, or on the outer baffle 1311, or on both the inner baffle 1313 and the outer baffle 1311. The present embodiment does not make any limitation here. Among them, the at least two stepped surfaces 1319 are coplanar, and the at least two stepped surfaces 1319 are perpendicular to the axial direction of the motor 100. In this way, the circuit board 50 placed on the at least two stepped surfaces 1319 can be kept horizontal, improving the stability of the circuit board 50 and avoiding the circuit board 50 from being skewed, so as to maintain the parallel relationship between the magnetic induction piece 71 and the magnetic piece 73 on the circuit board 50, reduce errors, and ensure detection accuracy.

[0093] Please refer to Figure 2 , Figure 9 and Figure 10 In some embodiments, the stator housing 11 is provided with an assembly opening 113 communicating with the mounting cavity 111. The assembly opening 113 can be optionally arranged at one end of the stator housing 11 away from the exposed part of the rotating shaft 80. The stator core 15, the stator magnetic piece, the rotor core 31, and the rotor magnetic piece 33 are installed into the mounting cavity 111 through the assembly opening 113. The motor 100 further comprises an end cover 90 connected to the stator housing 11 and shielding at least part of the assembly opening 113 to prevent the devices in the mounting cavity 111 from falling out of the assembly opening 113.

[0094] Optionally, the end cover 90 is a metal piece. Of course, the end cover 90 can also be made of other materials with sufficient structural strength, and the present embodiment does not make any limitation thereon. One end of the rotating shaft 80 is connected to the end cover 90 through a bearing 93. The metal end cover 90 is hard and has high structural strength, which can provide sufficient structural support when the rotor 30 rotates, so that the rotor 30 is not easy to deviate in the radial direction of the motor 100, thereby reducing errors and improving the detection accuracy of the detection assembly 70.

[0095] In combination with Figure 10In an embodiment, the distance between the end cover 90 and the magnetic induction piece 71 along the axial direction of the motor 100 is L, which satisfies the relationship: L≤5mm. It can be understood that if the distance L between the end cover 90 and the magnetic induction piece 71 is greater than 5mm, the space between the end cover 90 and the magnetic induction piece 71 is too large, which undoubtedly increases the overall length of the motor 100, which is not conducive to the miniaturization design of the motor 100. Therefore, the embodiment limits the distance L between the end cover 90 and the magnetic induction piece 71 to be ≤5mm, which can reduce the size of the motor 100, and L can be selected as 3mm, 4mm, 5mm, etc.

[0096] The circuit board 50 is electrically connected to the main controller of the oral care device through the wire 200. In the embodiment of the present application, the side of the circuit board 50 facing the end cover 90 is provided with a terminal, and the end cover 90 is provided with a wire hole 91 communicating with the outside and the mounting cavity 111. The wire hole 91 and the terminal are arranged opposite to each other in the axial direction of the motor 100. The wire 200 enters the mounting cavity 111 through the wire hole 91 of the end cover 90 and is connected to the terminal. In this way, the present embodiment does not need to open a hole on the stator shell 11 for the wire 200 to pass through, simplifying the structure of the stator shell 11 and facilitating production and manufacturing. Moreover, the wire hole 91 and the terminal are opposite to each other, and the wire 200 does not need to be bent, so that the wire 200 is shorter and the material cost is saved.

[0097] It can be understood that the magnetic piece 73 in the embodiment of the present application is located on the side of the circuit board 50 away from the end cover 90, so that the magnetic piece 73 and the wire 200 connected to the terminal are spaced apart, avoiding the wear of the wire 200 by the magnetic piece 73. It is worth mentioning that the side of the circuit board 50 away from the magnetic piece 73 is also provided with a connecting terminal. In the structure in which the stator magnetic piece is the stator winding 17, the power connection end of the wire bundle of the stator winding 17 passes through the circuit board 50 and is electrically connected to the connecting terminal. It can be seen that the connecting terminal is also arranged on the side of the circuit board 50 facing the end cover 90, that is, the connecting terminal can be exposed through the assembly opening 113, facilitating welding operation and improving assembly efficiency.

[0098] The above is an example of the structure in which the circuit board 50 connects the stator 10 and the magnetic piece 73 connects the rotor 30. In other embodiments not shown in the present application, the magnetic piece 73 can also connect the stator 10 and be provided with a relief hole 55. The rotor 30 includes a rotor core 31 and a rotor magnetic piece 33, the rotor magnetic piece 33 is arranged on the outer periphery of the rotor core 31, the circuit board 50 is electrically connected to the rotor magnetic piece 33 through the wire 200, and the rotor core 31 passes through the relief hole 55. The inner diameter of the relief hole 55 is greater than the outer diameter of the rotor core 31, and the hole wall of the relief hole 55 is spaced apart from the rotor core 31.

[0099] In order to avoid the winding of the wire 200, the motor 100 further comprises a limiting member connected with the stator 10, which is arranged on the rotating path of the rotor magnetic member 33 or the rotor core 31, and is used for limiting the rotating range of the rotor 30. For example, the limiting member is connected with the stator core 15, and the number of the limiting member is two, the two limiting members are oppositely arranged, and the rotor magnetic member 33 or the rotor core 31 is provided with a limiting part, so that the rotor 30 swings with an amplitude of 180 degrees. Of course, the cooperation between the limiting member and the rotor 30 can also be other forms, which is not required here.

[0100] The above is the explanation and description of the specific structure of the motor 100 according to the embodiments of the present application. It can be understood that the oral care device according to the embodiments of the present application has all the effects mentioned above due to the adoption of all the schemes of all the embodiments, and thus no more description is made here.

[0101] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and thus the terms describing the positional relationships in the drawings are only used for exemplary illustration, and cannot be understood as indicating or implying that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, therefore, the terms describing the positional relationships in the drawings are only used for exemplary illustration, and cannot be understood as limiting the present application, and for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0102] The above is only the preferred embodiments of the present application, and does not limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An electric machine characterized in that, The motor comprises: a driving assembly comprising a stator and a rotor, the stator comprising a stator housing and a stator winding arranged in the stator housing, the stator winding being configured to drive the rotor to rotate; a circuit board arranged in the stator housing, the circuit board being provided with a connecting terminal, and an electrical connection terminal of the stator winding being electrically connected to the connecting terminal; and a detection assembly comprising a magnetic induction element and a magnetic element, one of the circuit board and the magnetic element being connected to the stator, and the other being connected to the rotor, the magnetic induction element being arranged in a spaced manner with the magnetic element and being configured to induce a magnetic field of the magnetic element. In an axial direction of the motor, the magnetic element is closer to the magnetic induction element than the stator winding; and / or 2. The electric machine of claim 1, wherein, the connecting terminal is arranged on a side of the circuit board away from the magnetic element. In the axial direction of the motor, the circuit board and the magnetic element are arranged in a spaced manner, and a projection of the magnetic induction element at least partially overlaps a projection of the magnetic element.

3. The electric machine of claim 1, wherein, The magnetic induction element and the magnetic element are respectively arranged on two opposite sides of the circuit board.

4. The electric machine of claim 1, wherein, The circuit board is connected to the stator and is provided with a relief hole, the rotor comprises a rotor core and a rotor magnetic element, the rotor magnetic element is arranged on an outer periphery of the rotor core, the magnetic element is connected to the rotor magnetic element, and the rotor core is arranged through the relief hole.

5. The electric machine of claim 1, wherein, The inner diameter of the relief hole is greater than the outer diameter of the rotor core, and the hole wall of the relief hole is arranged in a spaced manner with the rotor core. The stator further comprises:

6. The electric machine of claim 1, wherein, a mounting bracket arranged in the stator housing, the stator winding being arranged around the mounting bracket, one of the mounting bracket and the circuit board being provided with a positioning protrusion, and the other being provided with a positioning groove, and the positioning protrusion being arranged through the positioning groove. The mounting bracket is provided with at least two positioning protrusions, and the at least two positioning protrusions are arranged in a spaced manner along a circumferential direction of the mounting bracket.

7. The electric machine of claim 6, wherein, At least one side of each mounting bracket is provided with a stepped surface, the positioning protrusion is arranged on the stepped surface, and the stepped surface abuts against the circuit board. At least two stepped surfaces are arranged in a coplanar manner, and a plane in which the at least two stepped surfaces are located is perpendicular to the axial direction of the motor.

8. The electric machine of claim 7, wherein, The circuit board is further provided with a clamping groove, and the mounting bracket is further provided with a clamping buckle, the clamping buckle is partially arranged out of the clamping groove, and the clamping buckle arranged out of the clamping groove and the stepped surface clamp the circuit board on two surfaces opposite to each other in the axial direction of the motor.

9. The electric machine of claim 7, wherein, The rotor comprises a rotor core and a rotor magnetic element, the rotor magnetic element is arranged on an outer periphery of the rotor core, and the magnetic element is arranged on an end of the rotor magnetic element close to the circuit board.

10. The electric machine of claim 1, wherein, The magnetic element and the rotor magnetic element are an integral component; or 11. The electric machine of claim 10, wherein, The magnetic element and the rotor magnetic element are bonded. In the axial direction of the motor, a projection of the magnetic element overlaps a projection of the rotor magnetic element, or the projection of the magnetic element is located in the projection of the rotor magnetic element.

12. The electric machine of claim 10, wherein, ​ 13. The electric machine of claim 1, wherein, The magnetic piece is connected to the stator and is provided with a avoiding hole, the rotor comprises a rotor core and a rotor magnetic piece, the rotor magnetic piece is arranged at the outer periphery of the rotor core, the circuit board is electrically connected to the rotor magnetic piece through a wire, and the rotor core is arranged in the avoiding hole. The inner diameter of the avoiding hole is greater than the outer diameter of the rotor core, and the hole wall of the avoiding hole is arranged in a spaced manner from the rotor core.

14. The electric machine of claim 13, wherein, Further comprising: A limiting piece connected to the stator and arranged on the rotating path of the rotor magnetic piece or the rotor core, for limiting the rotating range of the rotor.

15. The electric machine of any one of claims 1 to 14, wherein, The magnetic induction piece is a Hall element.

16. The electric machine of any one of claims 1 to 14, wherein, The stator shell is provided with a mounting cavity and an assembly opening communicating with the mounting cavity, the driving assembly and the detection assembly are arranged in the mounting cavity, and the motor further comprises: An end cover connected to the stator shell and shielding at least part of the assembly opening, the end cover being a metal piece.

17. The electric machine of claim 16, wherein, The magnetic piece is located on the side of the circuit board away from the end cover.

18. The electric machine of claim 16, wherein, Along the axial direction of the motor, the distance between the end cover and the magnetic induction piece is L, and the relationship L≤5mm is satisfied.

19. The electric machine of claim 16, wherein, The side of the circuit board facing the end cover is provided with a terminal, the end cover is provided with a wire hole communicating between the outside and the mounting cavity, and the wire hole is arranged in the axial direction of the motor and opposite to the terminal.

20. An oral treatment device, characterized by Comprise: A handle comprising the motor as claimed in any one of claims 1 to 19; And A care piece connected to the motor shaft of the motor.

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