Motor module and electric toothbrush

Abstract

The utility model relates to the technical field of oral cavity cleaning tools, and discloses a motor module and an electric toothbrush, the motor module comprises a circuit board assembly, a servo motor, an induction magnet and a Hall element, the circuit board assembly is used for being electrically connected with the electric toothbrush, the servo motor comprises a stator and a rotor, the stator is fixedly connected with the circuit board assembly, and the induction magnet is electrically connected with the Hall element. One of the stator and the rotor is provided with a permanent magnet, the other of the stator and the rotor is provided with a coil winding, the coil winding is provided with a wire outlet end, the wire outlet end is electrically connected with the circuit board assembly, the induction magnet is fixedly connected with the rotor to rotate along with the rotor, and the Hall element is arranged on the circuit board assembly and used for detecting the magnetic field of the induction magnet to detect the current position of the rotor. According to the motor module and the electric toothbrush, the motor and the Hall element are jointly and electrically connected to the circuit board assembly, the circuit board assembly is electrically connected with the main machine of the electric toothbrush, wiring arrangement of the motor and the Hall element is simplified, the assembly difficulty is low, and the assembly efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of oral cleaning tools, in particular to a motor module and an electric toothbrush. Background Art

[0002] Electric toothbrushes can use the motor to make the brush head produce high-frequency vibrations, instantly breaking down toothpaste into fine foam, thereby deeply cleaning the gaps between teeth. At the same time, the vibration of the bristles can promote blood circulation in the oral cavity and massage the gum tissue. Therefore, people prefer to use electric toothbrushes for oral cleaning.

[0003] In the related art, the motor needs to be detected by a Hall detection element, which detects the induction magnet of the motor to determine the current position of the motor's rotor. However, the existing motor circuit and the Hall element circuit are arranged separately, the circuit is relatively complex, the assembly is difficult, and the assembly efficiency is low. Utility Model Content

[0004] The embodiment of the utility model discloses a motor module and an electric toothbrush, wherein the motor and the Hall element are electrically connected to a circuit board assembly, and the circuit board assembly is electrically connected to the electric toothbrush host, thereby simplifying the wiring arrangement of the motor and the Hall element, reducing the difficulty of assembly and increasing the efficiency of assembly.

[0005] In the first aspect, an embodiment of the utility model discloses a motor module for an electric toothbrush, wherein the motor module comprises a circuit board assembly, a servo motor, an induction magnet and a Hall element, wherein the circuit board assembly is used to be electrically connected to the electric toothbrush, the servo motor comprises a stator and a rotor, the stator is fixedly connected to the circuit board assembly, one of the stator and the rotor is provided with a permanent magnet, and the other is provided with a coil winding, the coil winding having an outlet terminal, the outlet terminal is electrically connected to the circuit board assembly and electrically connected to the electric toothbrush through the circuit board, the induction magnet is fixedly connected to the rotor to rotate with the rotor, the Hall element is provided on the circuit board assembly and electrically connected to the electric toothbrush through the circuit board assembly, and the Hall element is used to detect the magnetic field of the induction magnet to detect the current position of the rotor.

[0006] As an optional implementation, in an embodiment of the utility model, the Hall element is arranged on one side of the circuit board assembly, the circuit board assembly has a wiring circuit electrically connected to the output terminal, and the wiring circuit is located on the side of the circuit board assembly away from the Hall element.

[0007] As an optional embodiment, in an embodiment of the utility model, the circuit board assembly includes a first side and a second side relative to each other, the first side is arranged toward the servo motor, the Hall element is arranged on the first side, the circuit board assembly has a bayonet passing through the first side and the second side, and the bayonet has an opening passing through the peripheral side of the circuit board assembly, the opening is used for the output terminal to be installed to the bayonet, the output terminal extends from the first side to the second side, and is electrically connected to the wiring circuit located on the second side.

[0008] As an optional implementation, in an embodiment of the utility model, the circuit board assembly is provided with a plurality of the bayonet ports, the coil winding has a plurality of outlet terminals, and the plurality of outlet terminals are respectively installed in a one-to-one correspondence with the plurality of bayonet ports.

[0009] As an optional implementation, in an embodiment of the utility model, the circuit board assembly has a main body and a lead-out portion, the Hall element is provided on the side of the main body facing the servo motor, the lead-out portion is connected to the main body, the lead-out portion extends and protrudes from the main body and is used to be electrically connected to the electric toothbrush, the lead-out end is electrically connected to the main body, and along a first direction, the main body is located between the lead-out end and the lead-out portion, and the first direction is perpendicular to the extension direction of the rotation axis of the rotor.

[0010] As an optional implementation, in an embodiment of the utility model, a first wire passing hole is provided at one end of the stator facing the circuit board assembly, and the circuit board assembly has a bayonet, and along the extension direction of the rotation axis of the rotor, the bayonet is arranged opposite to the first wire passing hole, and the wire outlet end is passed through the first wire passing hole and installed on the bayonet.

[0011] As an optional embodiment, in an embodiment of the utility model, the motor module also includes a mounting seat, the mounting seat is arranged at one end of the stator facing the circuit board assembly, the circuit board assembly is arranged on the side of the mounting seat away from the stator, the mounting seat is provided with a second wire passing hole, along the extension direction of the rotation axis of the rotor, the second wire passing hole is arranged opposite to the first wire passing hole and the bayonet, the wire outlet end is sequentially passed through the first wire passing hole and the second wire passing hole, and is installed in the bayonet.

[0012] As an optional implementation, in an embodiment of the utility model, the motor module also includes a wiring circuit electrically connected to the output terminal, the wiring circuit is electrically connected to the circuit board assembly, and the projections of the wiring circuit and the Hall element on the circuit board assembly are staggered.

[0013] As an optional implementation, in an embodiment of the utility model, the circuit board assembly includes an electrically connected first circuit board and a second circuit board, the first circuit board is fixedly connected to the stator, the second circuit board is arranged on a side of the first circuit board facing away from the stator, one of the first circuit board and the second circuit board is provided with a lead-out portion, the lead-out portion extends and protrudes from the first circuit board and the second circuit board, the lead-out portion is used to be electrically connected to the electric toothbrush, the Hall element is arranged on the first circuit board, and a wiring circuit is provided on a side of the second circuit board facing away from the first circuit board, and the output terminal is electrically connected to the wiring circuit.

[0014] As an optional implementation, in an embodiment of the utility model, the outlet terminal is bent and extended to a soldering point located on a side of the second circuit board away from the first circuit board, so as to be soldered to the wiring circuit.

[0015] As an optional implementation, in an embodiment of the utility model, the outlet end has a bending portion for bending and extending to the soldering point, and along a first direction, the first circuit board is located between the bending portion and the lead-out portion, and the first direction is perpendicular to the extension direction of the rotation axis of the rotor.

[0016] As an optional implementation, in an embodiment of the utility model, the first circuit board is a flexible circuit board, the second circuit board is a flexible circuit board, a reinforcement member is attached between the first circuit board and the second circuit board, and the reinforcement member is at least partially arranged corresponding to the Hall element, and the reinforcement member is used to improve the strength of the first circuit board and the second circuit board.

[0017] As an optional implementation, in an embodiment of the utility model, the reinforcement member is provided with through holes penetrating to both sides thereof in the thickness direction, the through holes are provided with conductive members, and the conductive members are electrically connected to the first circuit board and the second circuit board.

[0018] As an optional implementation, in an embodiment of the utility model, the second circuit board is a hard circuit board, and the second circuit board is at least partially arranged corresponding to the Hall element to improve the strength of the first circuit board.

[0019] As an optional implementation, in an embodiment of the utility model, the rigid circuit board includes a first rigid board and a second rigid board, the first rigid board is provided with the wiring circuit, the second rigid board is arranged on the side of the first rigid board away from the wiring circuit, the second rigid board is provided with a first shielding circuit, the first circuit board is arranged on the side of the second rigid board away from the first rigid board, and the first circuit board is electrically connected to the wiring circuit and the first shielding circuit.

[0020] As an optional implementation, in an embodiment of the utility model, the first circuit board includes a first soft board and a second soft board, the first soft board is arranged on the side of the second hard board away from the first hard board, the first soft board is provided with a first Hall acquisition circuit and a first three-phase circuit, the first Hall acquisition circuit is used to collect the signal of the Hall element, the first three-phase circuit is electrically connected to the wiring circuit, the second soft board is arranged on the side of the first soft board away from the second hard board, the second soft board is provided with a second Hall acquisition circuit, a second three-phase circuit, a ground wire and a power line, the second Hall acquisition circuit is used to collect the signal of the Hall element, the second three-phase circuit is electrically connected to the wiring circuit, the ground wire is electrically connected to the first shielding circuit, and the power line is electrically connected to the Hall element.

[0021] As an optional implementation, in an embodiment of the utility model, the first flexible board is further provided with a second shielding circuit, and the second shielding circuit is electrically connected to the ground wire.

[0022] As an optional implementation, in an embodiment of the utility model, the lead-out portion includes a first extension portion and a second extension portion, the first extension portion is arranged at the edge of the first circuit board, and the first extension portion is extended along the direction of the first circuit board toward the second circuit board, the second extension portion is bent and connected to the first extension portion, and the second extension portion is extended along the direction of the first circuit board away from the second circuit board.

[0023] As an optional implementation, in an embodiment of the utility model, the motor module further includes a magnetic isolation layer, and the magnetic isolation layer is arranged between the first circuit board and the second circuit board.

[0024] As an optional implementation manner, in an embodiment of the utility model, the magnetic isolation layer includes a copper film and / or a magnetic isolation coating.

[0025] In the second aspect, an embodiment of the utility model discloses an electric toothbrush, comprising a handle, a brush head and the motor module disclosed in the first aspect, wherein the brush head is arranged on the handle, the motor module is arranged on the handle, the circuit board assembly is electrically connected to the electric toothbrush, and the servo motor is used to drive the brush head to vibrate.

[0026] Compared with the prior art, the embodiments of the present invention have at least the following beneficial effects:

[0027] In the embodiment of the utility model, one of the permanent magnet and the coil winding is arranged on the stator of the servo motor, and the other is arranged on the rotor of the servo motor. The outlet end of the coil winding is used to be electrically connected to the electric toothbrush through the circuit board assembly. The coil winding is energized to make the rotor rotate relative to the stator. Based on this, when the motor module is applied to the electric toothbrush, the servo motor can drive the brush head of the electric toothbrush to vibrate. At the same time, the Hall element can detect the magnetic field of the induction magnet that rotates with the rotor, thereby detecting the current position of the rotor. In addition, the outlet end of the coil winding and the Hall element are both electrically connected to the electric toothbrush through the circuit board assembly, which can simplify the wiring arrangement of the motor and the Hall element, and the assembly difficulty is low and the assembly efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this technical field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 This is a schematic diagram of the structure of a motor module disclosed in Embodiment 1 of the present utility model;

[0030] Figure 2 This is a schematic diagram of the exploded structure of a motor module disclosed in Embodiment 1 of the present utility model;

[0031] Figure 3 It is a schematic diagram of the exploded structure of a servo motor disclosed in the first embodiment of the utility model;

[0032] Figure 4 It is a schematic cross-sectional structure diagram of a circuit board assembly disclosed in Embodiment 1 of the present utility model;

[0033] Figure 5 It is a structural schematic diagram of the first hard board disclosed in the first embodiment of the utility model;

[0034] Figure 6 It is a structural schematic diagram of the second hard board disclosed in the first embodiment of the utility model;

[0035] Figure 7 It is a structural schematic diagram of the first flexible board disclosed in the first embodiment of the utility model;

[0036] Figure 8 It is a structural schematic diagram of the second flexible board disclosed in the first embodiment of the utility model;

[0037] Fig. 9 This is a schematic diagram of the structure of an electric toothbrush disclosed in Embodiment 2 of the present utility model;

[0038] Fig.10 It is a schematic diagram of the exploded structure of an electric toothbrush disclosed in Embodiment 2 of the present utility model.

[0039] Description of main reference numerals

[0040] 100, motor module; 10, circuit board assembly; 10a, first side; 10b, second side; 10c, bayonet; 101, wiring circuit; 102, lead-out portion; 102a, first extension portion; 102b, second extension portion; 11, first circuit board; 12, second circuit board; 13, reinforcement; 13a, through hole; 14, first hard board; 15, second hard board; 15a, first shielding circuit; 16, first soft board; 16a, first Hall acquisition circuit; 16b, first three-phase circuit; 16c, second Shielding circuit; 17, second soft board; 17a, second Hall acquisition circuit; 17b, second three-phase circuit; 17c, ground wire; 17d, power line; 20, servo motor; 21, stator; 21a, first wire hole; 22, rotor; 23, permanent magnet; 24, outlet terminal; 24a, bending portion; 30, induction magnet; 40, Hall element; 50, conductive part; 60, mounting seat; 60a, second wire hole; 71, first magnetic isolation layer; 72, second magnetic isolation layer; 200, electric toothbrush; 201, handle. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0043] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0044] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0045] In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0046] The utility model discloses a motor module and an electric toothbrush. The motor and the Hall element are electrically connected to a circuit board assembly. The circuit board assembly is electrically connected to an electric toothbrush host, which simplifies the wiring arrangement of the motor and the Hall element, reduces the difficulty of assembly, and increases the efficiency of assembly.

[0047] Embodiment 1

[0048] Please also read Figures 1 to 3 , is a structural schematic diagram of a motor module 100 provided in Embodiment 1 of the present utility model, the motor module 100 is applied to an electric toothbrush, the motor module 100 comprises a circuit board assembly 10, a servo motor 20, an induction magnet 30 and a Hall element 40, the circuit board assembly 10 is used to be electrically connected to the electric toothbrush, the servo motor 20 comprises a stator 21 and a rotor 22, the stator 21 is fixedly connected to the circuit board assembly 10, one of the stator 21 and the rotor 22 is provided with a permanent magnet 23, and the other is provided with a coil winding (not shown), the coil winding has an outlet terminal 24, the outlet terminal 24 is electrically connected to the circuit board assembly 10 and is electrically connected to the electric toothbrush through the circuit board, the induction magnet 30 is fixedly connected to the rotor 22 to rotate with the rotor 22, the Hall element 40 is provided on the circuit board assembly 10 and is electrically connected to the electric toothbrush through the circuit board assembly 10, and the Hall element 40 is used to detect the magnetic field of the induction magnet 30 to detect the current position of the rotor 22.

[0049] In this embodiment, one of the permanent magnet 23 and the coil winding is disposed on the stator 21 of the servo motor 20, and the other is disposed on the rotor 22 of the servo motor 20. The outlet terminal 24 of the coil winding is used to be electrically connected to the electric toothbrush through the circuit board assembly 10. The coil winding is energized to enable the rotor 22 to rotate relative to the stator 21. Based on this, when the motor module 100 is applied to the electric toothbrush, the servo motor 20 can drive the brush head of the electric toothbrush to vibrate. At the same time, the Hall element 40 can detect the magnetic field of the induction magnet 30 that rotates with the rotor 22, thereby detecting the current position of the rotor 22. In addition, the outlet terminal 24 of the coil winding and the Hall element 40 are both electrically connected to the electric toothbrush through the circuit board assembly 10, which can simplify the wiring arrangement of the motor and the Hall element 40, and the assembly difficulty is low and the assembly efficiency is high.

[0050] In some embodiments, the Hall element 40 is disposed on one side of the circuit board assembly 10, and the circuit board assembly 10 has a wiring circuit 101 electrically connected to the outlet terminal 24, and the wiring circuit 101 is located on the side of the circuit board assembly 10 away from the Hall element 40. In this way, by locating the wiring circuit 101 on the side of the circuit board assembly 10 away from the Hall element 40, the wiring circuit 101 and the Hall element 40 are located on different sides of the circuit board assembly 10, and the electromagnetic interference generated when the wiring circuit 101 and the servo motor 20 are turned on has little effect on the Hall element 40, thereby ensuring the detection accuracy of the Hall element 40.

[0051] For example, Figure 2 and Figure 4 As shown, the circuit board assembly 10 includes a first side 10a and a second side 10b opposite to each other, the first side 10a is arranged toward the servo motor 20, the Hall element 40 is arranged on the first side 10a, the circuit board assembly 10 has a bayonet 10c that passes through the first side 10a and the second side 10b, and the bayonet 10c has an opening that passes through the peripheral side of the circuit board assembly 10, the opening is used for the outlet terminal 24 to be installed to the bayonet 10c, the outlet terminal 24 extends from the first side 10a to the second side 10b, and is electrically connected to the wiring circuit 101 located on the second side 10b. In this way, by setting the bayonet 10c on the circuit board assembly 10, and using the bayonet 10c to penetrate the first side 10a and the second side 10b of the circuit board assembly 10, the outlet terminal 24 can be extended from the first side 10a to the second side 10b through the bayonet 10c, and electrically connected to the wiring circuit 101 located on the second side 10b, without having to bypass the peripheral side of the circuit board assembly 10, which can simplify the routing of the outlet terminal 24, and at the same time, the opening of the bayonet 10c can be used to facilitate the installation and disassembly of the outlet terminal 24 and the bayonet 10c, reducing the difficulty of assembly. When the outlet terminal 24 is installed in the bayonet 10c, the bayonet 10c can pre-fix the position of the outlet terminal 24, which is convenient for welding the outlet terminal 24 and the wiring circuit 101, improving the welding accuracy, thereby ensuring that the reliability of the electrical connection between the outlet terminal 24 and the wiring circuit 101 is better.

[0052] Optionally, the circuit board assembly 10 is provided with a plurality of bayonet holes 10c, and the coil winding has a plurality of outlet terminals 24, and the plurality of outlet terminals 24 are respectively mounted on the plurality of bayonet holes 10c in a one-to-one correspondence. In this way, the plurality of outlet terminals 24 are respectively separated by the plurality of bayonet holes 10c, which can effectively prevent the plurality of outlet terminals 24 from contacting each other and causing a short circuit.

[0053] In some embodiments, Figure 4 As shown, the circuit board assembly 10 includes an electrically connected first circuit board 11 and a second circuit board 12, the first circuit board 11 is fixedly connected to the stator 21, the second circuit board 12 is arranged on the side of the first circuit board 11 away from the stator 21, one of the first circuit board 11 and the second circuit board 12 is provided with a lead-out portion 102, the lead-out portion 102 extends and protrudes from the first circuit board 11 and the second circuit board 12, and the lead-out portion 102 is used to be electrically connected to the electric toothbrush, the Hall element 40 is arranged on the first circuit board 11, and the wiring circuit 101 is arranged on the side of the second circuit board 12 away from the first circuit board 11. In this way, on the one hand, the Hall element 40 is arranged by the first circuit board 11, and the wiring circuit 101 is arranged on the side of the second circuit board 12 away from the first circuit board 11, so that the Hall element 40 and the wiring circuit 101 are located on different sides of the circuit board assembly 10, and the electromagnetic interference generated when the wiring circuit 101 is turned on by the servo motor 20 has little effect on the Hall element 40, thereby ensuring the detection accuracy of the Hall element 40. On the other hand, by electrically connecting the first circuit board 11 and the second circuit board 12 and providing a lead-out portion 102 on one of them to lead out both and electrically connect them to the electric toothbrush, the wiring arrangement of the circuit board assembly 10 can be simplified.

[0054] For example, in combination Figure 3 and Figure 4 As shown, the outlet terminal 24 is bent and extended to the soldering point located on the side of the second circuit board 12 away from the first circuit board 11, so as to be soldered with the wiring circuit 101. In this way, the outlet terminal 24 of the coil winding is bent and extended to the side of the second circuit board 12 away from the first circuit board 11, and the outlet terminal 24 can be soldered with the wiring circuit 101 at the soldering point, so as to realize electrical conduction between the outlet terminal 24 and the wiring circuit 101, and the soldering position (i.e., soldering point) of the outlet terminal 24 and the wiring circuit 101 and the Hall element 40 are located on different sides of the circuit board assembly 10, so as to avoid the soldering point formed by welding and the heat generated from welding from causing deformation of the first circuit board 11, resulting in the relative position shift of the Hall element 40 and the induction magnet 30, and the Hall element 40 and the induction magnet 30 can be kept parallel, and the detection accuracy of the Hall element 40 is high.

[0055] As an optional embodiment, the outlet terminal 24 has a bending portion 24a for bending and extending to the soldering point. In the first direction, the first circuit board 11 is located between the bending portion 24a and the lead-out portion 102, and the first direction is perpendicular to the extension direction of the rotation axis of the rotor 22. In this way, the bending portion 24a and the lead-out portion 102 are located on both sides of the first circuit board 11 along the first direction, and the routing mode of the outlet terminal 24 and the lead-out portion 102 is roughly to enter the circuit board assembly 10 from one side of the first circuit board 11 along the first direction, and leave the circuit board assembly 10 from the other side of the first circuit board 11 along the first direction, and the routing arrangement is relatively simple.

[0056] As another optional embodiment, the circuit board assembly 10 has a main body (not shown) and a lead-out portion 102. A Hall element 40 is provided on the side of the main body facing the servo motor 20. The lead-out portion 102 is connected to the main body, extends out of the main body and is used to be electrically connected to the electric toothbrush. The lead-out terminal 24 is electrically connected to the main body. In the first direction, the main body is located between the lead-out terminal 24 and the lead-out portion 102. The first direction is perpendicular to the extension direction of the rotation axis of the rotor 22. In this way, the lead-out terminal 24 and the lead-out portion 102 are located on both sides of the main body along the first direction. The routing mode of the lead-out terminal 24 and the lead-out portion 102 is roughly to enter the circuit board assembly 10 from one side of the main body along the first direction and leave the circuit board assembly 10 from the other side of the main body along the first direction. The routing arrangement is relatively simple.

[0057] The first direction is perpendicular to the extending direction of the rotation axis of the rotor 22 , that is, the first direction is the width direction or the length direction of the circuit board assembly 10 , which is not specifically limited in this embodiment.

[0058] In this embodiment, if Figure 4 As shown, the main body may be the first circuit board 11 , that is, the lead-out portion 102 is disposed on the first circuit board 11 .

[0059] In order to improve the strength of the circuit board assembly 10 and avoid the relative position of the Hall element 40 and the sensing magnet 30 being offset due to the deformation of the circuit board assembly 10, the first circuit board 11 is strengthened in this embodiment. The specific method may include:

[0060] As an optional embodiment, the first circuit board 11 is a flexible circuit board, the second circuit board 12 is a flexible circuit board, a reinforcing member 13 is attached between the first circuit board 11 and the second circuit board 12, and the reinforcing member 13 is at least partially arranged corresponding to the Hall element 40, and the reinforcing member 13 is used to improve the strength of the first circuit board 11 and the second circuit board 12. In this way, by arranging the reinforcing member 13 on the side of the first circuit board 11 away from the Hall element 40, and the reinforcing member 13 is at least partially arranged corresponding to the Hall element 40, the strength of the first circuit board 11 is improved by the reinforcing member 13, especially the strength of the part of the first circuit board 11 where the Hall element 40 is arranged, which can avoid the relative position of the Hall element 40 and the induction magnet 30 being offset due to the deformation of the first circuit board 11, the Hall element 40 and the induction magnet 30 can be kept parallel, and the detection accuracy of the Hall element 40 is high. In addition, the reinforcing member 13 can simultaneously improve the strength of the second circuit board 12, and the overall strength of the circuit board assembly 10 is high.

[0061] Preferably, if Figure 2 and Figure 4 As shown, the shape and size of the reinforcement member 13 match the first circuit board 11 , and the reinforcement member 13 can strengthen the various parts of the first circuit board 11 as a whole, so that the overall strength of the first circuit board 11 is relatively high.

[0062] Exemplarily, the reinforcing member 13 is provided with through holes 13a penetrating to both sides thereof in the thickness direction, and the through holes 13a are provided with conductive members 50, and the conductive members 50 are electrically connected to the first circuit board 11 and the second circuit board 12. In this way, by providing the through holes 13a on the reinforcing member 13 and electrically connecting the first circuit board 11 and the second circuit board 12 with the conductive members 50, the electrical connection wiring of the first circuit board 11 and the second circuit board 12 can directly penetrate the reinforcing member 13 without bypassing the peripheral side of the reinforcing member 13, which can simplify the wiring arrangement of the electrical connection between the first circuit board 11 and the second circuit board 12.

[0063] As another optional embodiment, the second circuit board 12 is a hard circuit board, and at least part of the second circuit board 12 is arranged corresponding to the Hall element 40 to improve the strength of the first circuit board 11. In this way, on the one hand, the wiring line 101 is arranged through the second circuit board 12, and the wiring line 101 can be electrically connected to the output terminal 24 of the servo motor 20. On the other hand, the first circuit board 11 is reinforced by the second circuit board 12, and no other reinforcement structure is required to be additionally arranged, and the second circuit board 12 is used to achieve structural reuse.

[0064] Exemplarily, when the first circuit board 11 is a flexible circuit board and the second circuit board 12 is a hard circuit board, the two can be combined as a hard-soft board, and specifically can include a first hard board 14, a second hard board 15, a first soft board 16 and a second soft board 17 stacked in sequence.

[0065] like Figure 5 As shown, the first hard board 14 is provided with a wiring circuit 101 , and the wiring circuit 101 is electrically connected to the output terminal 24 of the servo motor 20 .

[0066] like Figure 6 As shown, the second hard board 15 is provided with a first shielding circuit 15 a, and the first shielding circuit 15 a is used to shield the electromagnetic interference generated by the wiring circuit 101 to avoid affecting the Hall element 40.

[0067] like Figure 7 As shown, the first flexible board 16 is provided with two first Hall acquisition circuits 16a, a first three-phase circuit 16b, and a second shielding circuit 16c.

[0068] like Figure 8 As shown, the second flexible board 17 is provided with two second Hall acquisition circuits 17 a , a second three-phase circuit 17 b , a ground line 17 c , and a power line 17 d , and the second flexible board 17 is provided with a Hall element 40 .

[0069] Among them, the first three-phase line 16b and the second three-phase line 17b are both electrically connected to the wiring line 101, have strong overcurrent capacity, and are suitable for the servo motor 20 with higher power in this embodiment. Similarly, the first Hall acquisition line 16a and the second Hall acquisition line 17a are used to simultaneously collect signals of two Hall elements 40, with strong overcurrent capacity and high signal acquisition accuracy. The first shielding line 15a and the second shielding line 16c are connected to the ground wire 17c, and the first shielding line 15a and the second shielding line 16c are grounded, so that the first shielding line 15a and the second shielding line 16c can block the electromagnetic interference generated by the wiring line 101, thereby improving the detection accuracy of the Hall element 40. The power line 17d is electrically connected to the Hall element 40, and the power line 17d is used to power the Hall element.

[0070] Exemplarily, the lead-out portion 102 includes a first extension portion 102a and a second extension portion 102b, the first extension portion 102a is arranged at the edge of the first circuit board 11, and the first extension portion 102a is extended along the direction of the first circuit board 11 toward the second circuit board 12, the second extension portion 102b is bent and connected to the first extension portion 102a, and the second extension portion 102b is extended along the direction of the first circuit board 11 away from the second circuit board 12. In this way, the first extension portion 102a is extended along the direction of the first circuit board 11 toward the second circuit board 12, and the shear force generated at the connection between the first extension portion 102a and the first circuit board 11 is toward the second circuit board 12. The bending force will not cause the first extension portion 102a to drive the first circuit board 11 to be torn from the second circuit board 12, but can press the first circuit board 11 against the second circuit board 12. The second extension portion 102b is extended along the direction of the first circuit board 11 away from the second circuit board 12, and the shear force generated at the connection between the second extension portion 102b and the first extension portion 102a is far away from the first circuit board 11, and has less impact on the first circuit board 11, resulting in a lower risk of the first circuit board 11 being torn from the second circuit board 12.

[0071] In some embodiments, Figure 2 and Figure 3 As shown, the stator 21 is provided with a first wire hole 21a at one end facing the circuit board assembly 10, and the circuit board assembly 10 has a bayonet 10c. Along the extension direction of the rotation axis of the rotor 22, the bayonet 10c is arranged opposite to the first wire hole 21a, and the outlet terminal 24 is passed through the first wire hole 21a and installed on the bayonet 10c. In this way, by setting the first wire hole 21a, the outlet terminal 24 can extend from the inside of the stator 21 to the outside of the stator 21 and be electrically connected to the wiring line 101. At the same time, by using the bayonet 10c and the first wire hole 21a being arranged opposite to each other along the extension direction of the rotation axis of the rotor 22, the outlet terminal 24 can extend along the extension direction, pass through the first wire hole 21a and be installed on the bayonet 10c, and the wiring arrangement of the outlet terminal 24 is relatively simple.

[0072] Exemplarily, the motor module 100 further includes a mounting seat 60, which is disposed at one end of the stator 21 facing the circuit board assembly 10, and the circuit board assembly 10 is disposed at a side of the mounting seat 60 away from the stator 21. The mounting seat 60 is provided with a second wire hole 60a, and along the extension direction of the rotation axis of the rotor 22, the second wire hole 60a is disposed opposite to the first wire hole 21a and the bayonet 10c, and the outlet terminal 24 is sequentially passed through the first wire hole 21a and the second wire hole 60a, and is mounted on the bayonet 10c. In this way, on the one hand, by disposing the mounting seat 60 at one end of the stator 21 facing the circuit board assembly 10, and using the mounting seat 60 to set the circuit board assembly 10, the servo motor 20 and the circuit board assembly 10 are connected to form an integral structure, thereby realizing the assembly of the motor module 100. On the other hand, a second wire hole 60a is set through the mounting base 60, and the first wire hole 21a, the second wire hole 60a, and the bayonet 10c are relatively arranged along the extension direction of the rotation axis of the rotor 22. The wire terminal 24 can extend along the extension direction, pass through the first wire hole 21a, the second wire hole 60a in sequence, and be installed on the bayonet 10c. The wiring arrangement of the wire terminal 24 is relatively simple.

[0073] In some embodiments, the motor module 100 further includes a wiring circuit 101 electrically connected to the outlet terminal 24, the wiring circuit 101 is electrically connected to the circuit board assembly 10, and the projections of the wiring circuit 101 and the Hall element 40 on the circuit board assembly 10 are staggered. In this way, by staggering the projections of the wiring circuit 101 and the Hall element 40 on the circuit board assembly 10, the distance between the wiring circuit 101 and the Hall element 40 in the horizontal direction (the plane where the circuit board assembly 10 is located) is relatively far, which can reduce the influence of electromagnetic interference generated when the wiring circuit 101 and the servo motor 20 are turned on to the Hall element 40, thereby improving the detection accuracy of the Hall element 40.

[0074] In order to further reduce the influence of electromagnetic interference generated when the wiring line 101 and the servo motor 20 are turned on the Hall element 40, the motor module 100 of this embodiment further includes a magnetic isolation layer, which is arranged between the first circuit board 11 and the second circuit board 12. In this way, the magnetic isolation effect of the magnetic isolation layer can be used to block electromagnetic interference and reduce the influence of electromagnetic interference on the Hall element 40.

[0075] Exemplarily, the magnetic isolation layer includes a first magnetic isolation layer 71 and a second magnetic isolation layer 72 . The first magnetic isolation layer 71 is disposed between the first circuit board 11 and the reinforcement 13 , and the second magnetic isolation layer 72 is disposed between the reinforcement 13 and the second circuit board 12 .

[0076] Optionally, the magnetic isolation layer includes a copper film and / or a magnetic isolation coating. Thus, different magnetic isolation layers can be selected according to actual conditions, and this embodiment does not specifically limit this.

[0077] The first embodiment of the utility model provides a motor module 100, wherein one of the permanent magnet 23 and the coil winding is disposed on the stator 21 of the servo motor 20, and the other is disposed on the rotor 22 of the servo motor 20, and the outlet terminal 24 of the coil winding is used to be electrically connected to the electric toothbrush through the circuit board assembly 10, and the coil winding is energized to enable the rotor 22 to rotate relative to the stator 21. Based on this, when the motor module 100 is applied to the electric toothbrush, the servo motor 20 can drive the brush head of the electric toothbrush to vibrate, and at the same time, the Hall element 40 can detect the magnetic field of the induction magnet 30 that rotates with the rotor 22, thereby detecting the current position of the rotor 22. In addition, the outlet terminal 24 of the coil winding and the Hall element 40 are both electrically connected to the electric toothbrush through the circuit board assembly 10, which can simplify the wiring arrangement of the motor and the Hall element 40, and the assembly difficulty is low and the assembly efficiency is high.

[0078] Embodiment 2

[0079] Please also read Figures 9 and 10 , is a structural schematic diagram of an electric toothbrush 200 provided in Example 2 of the present utility model, the electric toothbrush 200 includes a handle 201, a brush head (not shown) and the motor module 100 of Example 1, the brush head is arranged on the handle 201, the motor module 100 is arranged on the handle 201, the circuit board assembly is connected to the electric toothbrush 200, and the servo motor is used to drive the brush head to vibrate.

[0080] The embodiment of the utility model provides an electric toothbrush 200, the wiring arrangement of the motor module 100 is relatively simple, the assembly difficulty is relatively low, and the assembly efficiency is relatively high.

[0081] The above is a detailed introduction to a motor module and an electric toothbrush disclosed in the embodiment of the present invention. This article uses individual examples to illustrate the principle and implementation method of the present invention. The description of the above embodiments is only used to help understand the motor module and electric toothbrush of the present invention and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In addition, the above-mentioned specific implementation methods can be combined or selected. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A motor module, characterized in that: Applied to an electric toothbrush, the motor module comprises: A circuit board assembly, the circuit board assembly being used to be electrically connected to the electric toothbrush; A servo motor, the servo motor comprising a stator and a rotor, the stator being fixedly connected to the circuit board assembly, one of the stator and the rotor being provided with a permanent magnet, and the other being provided with a coil winding, the coil winding having an outlet terminal, the outlet terminal being electrically connected to the circuit board assembly and electrically connected to the electric toothbrush through the circuit board; an induction magnet, wherein the induction magnet is fixedly connected to the rotor so as to rotate along with the rotor; and A Hall element is disposed on the circuit board assembly and electrically connected to the electric toothbrush through the circuit board assembly. The Hall element is used to detect the magnetic field of the induction magnet to detect the current position of the rotor.

2. The motor module according to claim 1, characterized in that: The Hall element is arranged on one side of the circuit board assembly. The circuit board assembly has a wiring circuit electrically connected to the output terminal. The wiring circuit is located on a side of the circuit board assembly away from the Hall element.

3. The motor module according to claim 2, characterized in that: The circuit board assembly includes a first side and a second side opposite to each other, the first side is arranged toward the servo motor, the Hall element is arranged on the first side, the circuit board assembly has a bayonet penetrating the first side and the second side, and the bayonet has an opening penetrating to the peripheral side of the circuit board assembly, the opening is used for the outlet terminal to be installed to the bayonet, the outlet terminal extends from the first side to the second side, and is electrically connected to the wiring circuit located on the second side.

4. The motor module according to claim 3, characterized in that: The circuit board assembly is provided with a plurality of the bayonet ports, the coil winding has a plurality of outlet terminals, and the plurality of outlet terminals are respectively mounted on the plurality of bayonet ports in a one-to-one correspondence.

5. The motor module according to claim 1, characterized in that: The circuit board assembly comprises a main body and a lead-out portion, wherein the Hall element is provided on a side of the main body facing the servo motor, the lead-out portion is connected to the main body, the lead-out portion extends and protrudes from the main body and is used to be electrically connected to the electric toothbrush, the lead-out terminal is electrically connected to the main body, and along a first direction, the main body is located between the lead-out terminal and the lead-out portion, and the first direction is perpendicular to the extension direction of the rotation axis of the rotor.

6. The motor module according to claim 1, characterized in that: A first wire passing hole is provided at one end of the stator facing the circuit board assembly, and the circuit board assembly has a bayonet. Along the extension direction of the rotation axis of the rotor, the bayonet is arranged opposite to the first wire passing hole, and the outlet terminal is passed through the first wire passing hole and installed on the bayonet.

7. The motor module according to claim 6, characterized in that: The motor module also includes a mounting seat, which is arranged at one end of the stator facing the circuit board assembly, and the circuit board assembly is arranged on a side of the mounting seat away from the stator. The mounting seat is provided with a second wire passing hole, and along the extension direction of the rotation axis of the rotor, the second wire passing hole is arranged opposite to the first wire passing hole and the bayonet, and the outlet terminal is sequentially passed through the first wire passing hole and the second wire passing hole, and is installed in the bayonet.

8. The motor module according to claim 1, characterized in that: The motor module also includes a wiring circuit electrically connected to the output terminal, the wiring circuit is electrically connected to the circuit board assembly, and the projections of the wiring circuit and the Hall element on the circuit board assembly are staggered.

9. The motor module according to claim 1, characterized in that: The circuit board assembly includes a first circuit board and a second circuit board that are electrically connected, the first circuit board is fixedly connected to the stator, the second circuit board is arranged on a side of the first circuit board facing away from the stator, one of the first circuit board and the second circuit board is provided with a lead-out portion, the lead-out portion extends and protrudes from the first circuit board and the second circuit board, the lead-out portion is used to be electrically connected to the electric toothbrush, the Hall element is arranged on the first circuit board, and a wiring circuit is provided on a side of the second circuit board facing away from the first circuit board, and the output terminal is electrically connected to the wiring circuit.

10. The motor module according to claim 9, characterized in that: The outlet terminal is bent and extended to a soldering point located on a side of the second circuit board away from the first circuit board so as to be soldered to the wiring circuit.

11. The motor module according to claim 10, characterized in that: The lead-out end has a bending portion for bending and extending to the soldering point. Along a first direction, the first circuit board is located between the bending portion and the lead-out portion. The first direction is perpendicular to the extension direction of the rotation axis of the rotor.

12. The motor module according to claim 9, characterized in that: The first circuit board is a flexible circuit board, the second circuit board is a flexible circuit board, a reinforcement is attached between the first circuit board and the second circuit board, and the reinforcement is at least partially arranged corresponding to the Hall element, and the reinforcement is used to improve the strength of the first circuit board and the second circuit board.

13. The motor module according to claim 12, characterized in that: The reinforcing member is provided with through holes penetrating to both sides thereof in a thickness direction, and the through holes are provided with conductive members, and the conductive members are electrically connected to the first circuit board and the second circuit board.

14. The motor module according to claim 9, characterized in that: The second circuit board is a hard circuit board, and at least a portion of the second circuit board is arranged corresponding to the Hall element to improve the strength of the first circuit board.

15. The motor module according to claim 14, characterized in that: The rigid circuit board includes a first rigid board and a second rigid board, the first rigid board is provided with the wiring circuit, the second rigid board is provided on a side of the first rigid board away from the wiring circuit, the second rigid board is provided with a first shielding circuit, the first circuit board is provided on a side of the second rigid board away from the first rigid board, and the first circuit board is electrically connected to the wiring circuit and the first shielding circuit.

16. The motor module according to claim 15, characterized in that: The first circuit board includes a first soft board and a second soft board. The first soft board is arranged on a side of the second hard board away from the first hard board. The first soft board is provided with a first Hall acquisition circuit and a first three-phase circuit. The first Hall acquisition circuit is used to acquire the signal of the Hall element. The first three-phase circuit is electrically connected to the wiring circuit. The second soft board is arranged on a side of the first soft board away from the second hard board. The second soft board is provided with a second Hall acquisition circuit, a second three-phase circuit, a ground wire and a power line. The second Hall acquisition circuit is used to acquire the signal of the Hall element. The second three-phase circuit is electrically connected to the wiring circuit, the ground wire is electrically connected to the first shielding circuit, and the power line is electrically connected to the Hall element.

17. The motor module according to claim 16, characterized in that: The first flexible board is also provided with a second shielding circuit, and the second shielding circuit is electrically connected to the ground wire.

18. The motor module according to claim 9, characterized in that: The lead-out portion includes a first extension portion and a second extension portion, the first extension portion is arranged at the edge of the first circuit board, and the first extension portion is extended along the direction of the first circuit board toward the second circuit board, the second extension portion is bent and connected to the first extension portion, and the second extension portion is extended along the direction of the first circuit board away from the second circuit board.

19. The motor module according to claim 9, characterized in that: The motor module further includes a magnetic isolation layer, and the magnetic isolation layer is arranged between the first circuit board and the second circuit board.

20. The motor module according to claim 19, characterized in that: The magnetic isolation layer includes a copper film and / or a magnetic isolation coating.

21. An electric toothbrush, characterized in that: It comprises a handle, a brush head and a motor module as described in any one of claims 1 to 20, wherein the brush head is arranged on the handle, the motor module is arranged on the handle, the circuit board assembly is electrically connected to the electric toothbrush, and the servo motor is used to drive the brush head to vibrate.

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