Motor for electric toothbrush and electric toothbrush having the same

Abstract

The present invention relates to the field of motor technology, and in particular to a motor for an electric toothbrush and an electric toothbrush having the same, the motor comprising a shell, at least one pair of rotor core groups being fixed inside the shell, each rotor core group being composed of a plurality of stacked rotor cores, at least one pair of rotor core groups being sleeved with two core brackets, the two core brackets being provided with card slots, and when the two core brackets are inserted from the two ends of the rotor core group, the card slots on the core brackets are clamped on the core protrusions of the rotor core; the present invention arranges the core bracket for fixing the split-structure rotor core group as an integrated structure in the circumferential direction and as a structure of two core brackets spliced ​​in the axial direction, so that during the assembly process, the split-structure rotor core group can be conveniently assembled and fixed by inserting the core brackets from the two ends of the rotor core group, thereby significantly improving the assembly efficiency and ensuring that the rotor core group is assembled in place.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor for an electric toothbrush and an electric toothbrush having the motor. Background Art

[0002] Electric toothbrushes rely on the rapid rotation of the motor to generate high-frequency vibrations in the brush head, instantly breaking down toothpaste into fine foam and deeply cleaning between teeth. Simultaneously, the vibrations of the bristles on the brush head promote blood circulation in the mouth and massage the gums. Therefore, the motor is a key component of an electric toothbrush. Current requirements for electric toothbrushes require that the motor shaft be able to oscillate at a very high frequency (200-400Hz) and a small angle (no more than ±15°) near its center balance point, thereby driving the brush head to rapidly oscillate for cleaning.

[0003] In order to achieve the left and right swing of the brush head, in addition to the sudden left and right driving force, a restoring force to restore the center is also required. The electric toothbrush motor in the existing technology generally uses the interaction between the magnet and the coil to generate the left and right alternating driving force. The coil can generate the alternating driving force by passing an alternating current, and most of the restoring force structures use springs. However, this type of structure is easily damaged and difficult to repair, resulting in a short service life of the electric toothbrush motor. Based on this, there is provided an electric toothbrush motor on the market that generates a restoring force by the magnetic interaction between the magnet and the stator core. The magnetic force has no mechanical loss, which has obvious advantages over motors that use springs to provide a restoring force.

[0004] Furthermore, Chinese patent publication number CN206977236U discloses an electric toothbrush and its motor assembly. The motor assembly includes a motor housing and at least two symmetrical stator cores fixedly mounted within the stator housing. The stator cores are wound with coil windings, including an insulating bobbin for insulating the stator core and the coil windings. The stator cores also include at least two pairs of magnetic steel structures mating with the stator cores. The magnetic steel structures are fixedly connected to the outer periphery of a shaft coupling, which is fixedly connected to the motor shaft. Specifically, the motor assembly generates a restoring force through magnetic interaction between the magnetic steel and the stator core. However, the above-mentioned motor device still has the following defects: (1) The stator core and the shell are an integrated structure, that is, the two poles of the stator core are an integrated structure and are connected through the shell. Due to the processing limit, this structure makes the shell located at the outer ring of the stator core have a minimum wall thickness, and this minimum wall thickness is unnecessary from the perspective of magnetic conductivity, thereby reducing the space occupied by the coil winding, that is, limiting the number of turns of the coil winding, and thus reducing the performance of the motor device, especially for smaller-sized motors; (2) The magnet and the motor shaft are connected through the rotor core, and the rotor core will occupy a certain space, thereby relatively reducing the space occupied by the magnet, and the volume of the rotor core itself cannot be made larger, thereby reducing the performance of the motor device.

[0005] To address the above-mentioned shortcomings, Chinese patent publication number "CN210111775U" discloses a motor for an electric toothbrush. The motor comprises a housing, a stator core, coil windings, magnetic components, a motor shaft, and a stator bracket. Each magnetic component is bipolar. The housing and stator core, as well as the multiple stator cores, are split-type structures. A second gap is formed between adjacent stator brackets. The stator core comprises a core body and a core protrusion protruding outward from the outer periphery of the core body. The coil windings are attached to the outer surface of the stator bracket, with the core protrusion located in the second gap and the coil slots. In this technical solution, a split-type structure is employed between the housing and the stator core, and between each pair of stator cores. This structure overcomes the existing limitations on the minimum outer wall thickness of the stator core's integral structure, freeing up unnecessary wall space for the coil windings, thereby significantly improving motor performance. However, in this technical solution, two adjacent stator cores need to be fixed by stator brackets. Since stator brackets are respectively provided on adjacent sides of the two stator cores, it is difficult to fix them in place at one time during actual assembly, resulting in low assembly efficiency. Summary of the Invention

[0006] In view of the problems in the prior art, the present invention aims to provide a motor for an electric toothbrush, which improves the assembly efficiency of the motor for an electric toothbrush by improving the structure of the stator bracket.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A motor for an electric toothbrush, comprising a housing, wherein at least one pair of rotor core groups is fixed in the housing, each rotor core group comprising a plurality of rotor cores stacked together, the rotor core comprising a core body and a core protrusion extending outwardly from the outer periphery of the core body;

[0009] At least one pair of rotor core groups is provided with two core supports extending in the axial direction. The two core supports are provided with slots with openings pointing to opposite sides. When the two core supports are inserted from the two ends of the rotor core group, the slots on the core supports are clamped on the core protrusions of the rotor core.

[0010] In a further technical solution, a first protrusion is provided on one side of the rotor core and a first groove is provided on the other side, and when the rotor cores are stacked, the first protrusion on one rotor core is embedded and matched with the first groove on the adjacent rotor core.

[0011] In a further technical solution, the slot includes two parallel and spaced slot wall plates extending outward from the main body of the core support, a slot bottom plate is provided between the two slot wall plates, and after the core support is assembled in place, the slot bottom plate is in close contact with the end of the rotor core group.

[0012] In a further technical solution, adjacent ends of two core supports are provided with second protrusions and second grooves, and the second protrusion at one end of one core support is embedded and matched with the second groove at the end of its adjacent core support.

[0013] In a further technical solution, the second protrusion is a round rod extending in the axial direction, and the second groove is a cylindrical groove extending in the axial direction;

[0014] The hanging end of the round rod is an arc end protruding outward, and the opening end of the cylindrical groove is a flared structure.

[0015] In a further technical solution, the core bracket is provided with clamping parts arranged at intervals along the circumferential direction and correspondingly matched with the rotor core assembly, and two sides of the clamping parts are in abutment with two sides of the core main body.

[0016] The present invention also provides an electric toothbrush having the motor.

[0017] Compared with the prior art, the present invention has the following technical effects:

[0018] The electric toothbrush motor provided by the present invention is configured such that the core bracket for fixing the split-structure rotor core group is configured as an integrated structure in the circumferential direction and as a structure in which two core brackets are spliced ​​in the axial direction. During the actual assembly process, the rotor core group with a split structure can be conveniently assembled and fixed by inserting the core brackets from both ends of the rotor core group, thereby significantly improving the assembly efficiency and ensuring that the rotor core group is assembled in place. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of a motor for an electric toothbrush provided according to a specific embodiment of the present invention;

[0020] Figure 2 Shown is a radial cross-sectional view of the motor for an electric toothbrush according to the present invention;

[0021] Figure 3 It is a schematic structural diagram of the core support in the present invention;

[0022] Figure 4 Shown is a schematic structural diagram of the rotor core in the present invention;

[0023] Figure 5 An exploded view of a motor for an electric toothbrush according to an embodiment of the present invention is shown;

[0024] Explanation of the numbers in the figure: 10, housing; 101, bearing chamber; 11, bearing; 12, flexible sleeve; 13, sleeve; 14, tail end cover; 20, rotor core group; 21, rotor core; 211, core body; 212, core protrusion; 213, first protrusion; 214, first groove; 30, core bracket; 31, slot; 311, slot wall; 312, slot bottom; 32, second protrusion; 33, second groove; 34, arc end; 35, clamping part; 40, coil winding; 50, magnetic component; 51, magnet; 52, gap; 60, stator core group; 61, stator core sheet; 70, motor shaft. DETAILED DESCRIPTION

[0025] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further explained below with reference to specific drawings.

[0026] It should be noted that, in the present invention, when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0028] As mentioned above, combined with Figure 1 、 2 As shown, the present invention provides a motor for an electric toothbrush, comprising a housing 10, wherein at least one pair of rotor core groups 20 are fixed in the housing 10, each rotor core group 20 comprising a plurality of rotor cores 21 stacked together, wherein the rotor core 21 comprises a core body 211 and a core protrusion 212 protruding outward from the outer periphery of the core body 211;

[0029] Two axially extending core supports 30 are sleeved on at least one pair of rotor core groups 20. The two core supports 30 are provided with slots 31 with openings pointing to opposite directions. When the two core supports 30 are inserted from both ends of the rotor core group 20, the slots 31 on the core supports 30 are clamped on the core protrusions 212 of the rotor core 21.

[0030] More specifically, in a specific embodiment of the present invention, combined with Figure 2 、 5 As shown in , the electric toothbrush motor provided by the present invention further includes a coil winding 40 wound on each rotor core group 20 and fixed in the housing 10, a magnetic component 50 matched with each rotor core group 20, a stator core group 60 arranged inside the magnetic component 50 and composed of a plurality of stator core sheets 61 stacked, and a motor shaft 70 connected to the stator core group 60 and rotatably mounted in the housing 10;

[0031] Each magnetic component 50 includes two magnetic steels 51 with different polarities, and the two magnetic steels 51 constituting each magnetic component 50 are arranged to extend along the axial direction of the motor shaft 70 , with a gap 52 between two adjacent magnetic components 50 .

[0032] The motor shaft 70 is rotatably mounted within the housing 10 via bearings 11 mounted at both ends of the housing 10. A flexible sleeve 12 is sleeved over the motor shaft 70 inside the bearing 11 at one end, and a sleeve 13 is sleeved over the motor shaft 70 inside the bearing 11 at the other end. The flexible sleeve 12 is made of a soft plastic material, such as graphite nylon or Teflon. The flexible sleeve 12 automatically adapts to the movement of the motor shaft 70 during axial or circumferential reciprocating motion, resulting in low noise during motor operation and a lubricating effect, extending the service life of the motor shaft 70.

[0033] In a specific embodiment of the present invention, Figure 5 As shown, the shell 10 is a tubular shell with an open end and an integrated end cover structure at the other end. The side with the integrated end cover structure protrudes outward to form a bearing chamber 101 for accommodating the bearing 11, and a through hole is provided at the center of the integrated end cover to allow the motor shaft 70 to extend out. A tail end cover 14 is provided on one side of the opening of the shell 10, and the tail end cover 14 is fixed to the open end of the shell 10 by a snap connection.

[0034] In the technical solution provided by the present invention, the core bracket 30 used to fix the split-structure rotor core group 20 is set as an integrated structure in the circumferential direction and as a structure of two core brackets 30 spliced ​​in the axial direction. In the actual assembly process, the rotor core group 20 with a split structure can be conveniently assembled and fixed by inserting the core brackets 30 from both ends of the rotor core group 20, which significantly improves the assembly efficiency and ensures that the rotor core group 20 is assembled in place.

[0035] Further, according to the present invention, combined with Figure 4 As shown, the rotor core 21 is provided with a first protrusion 213 on one side and a first groove 214 on the other side. When the rotor cores 21 are stacked, the first protrusion 213 on one rotor core 21 fits in place with the first groove 214 on the adjacent rotor core 21. More specifically, both the first protrusion 213 and the first groove 214 are provided on the main body 211 of the rotor core 21. More preferably, two first protrusions 213 are spaced apart. The provision of the first protrusions 213 and the first groove 214 on the rotor core 21 provides a certain degree of pre-fixation during stacking, ensuring assembly accuracy and efficiency.

[0036] Further, according to the present invention, combined with Figure 3As shown, the slot 31 includes two parallel, spaced-apart slot walls 311 extending outward from the main body of the core support 30. A slot bottom plate 312 is disposed between the two slot walls 311. When the core support 30 is assembled, the slot bottom plate 312 abuts against the end of the rotor core assembly 20. This structural design of the slot 31 improves assembly precision by utilizing the slot walls 311 on both sides to constrain the core protrusion 212 of the rotor core 21, and the slot bottom plate 312 of the slot 31 to constrain the end of the rotor core assembly 20.

[0037] According to the present invention, in the present invention, combined with Figure 3 As shown, as a specific embodiment of splicing two core supports 30, the adjacent ends of the two core supports 30 are provided with a second protrusion 32 and a second groove 33, and the second protrusion 32 at the end of one core support 30 is embedded and matched with the second groove 33 at the end of its adjacent core support 30. More preferably, in a specific embodiment of the present invention, the second protrusion 32 is a round rod extending in the axial direction, and the second groove 33 is a cylindrical groove extending in the axial direction; the hanging end of the round rod is an arc end 34 protruding outward, and the open end of the cylindrical groove is a flared structure. In this way, the arc end 34 of the round rod can be more easily inserted into the cylindrical groove body of the flared structure to achieve embedding fit.

[0038] According to the present invention, the core support 30 is provided with circumferentially spaced clips 35 that mate with the rotor core assembly 20. The sides of the clips 35 abut against the sides of the core body 211. The design of the clips 35 further defines the position of the rotor core 21, ensuring precision during assembly.

[0039] The basic principles, main features, and characteristics of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A motor for an electric toothbrush, comprising a housing (10), characterized in that: At least one pair of rotor core groups (20) is fixed in the housing (10), each rotor core group (20) comprises a plurality of rotor cores (21) stacked together, and the rotor core (21) comprises a core main body (211) and a core protrusion (212) protruding outward from the outer periphery of the core main body (211); Two core supports (30) extending in the axial direction are sleeved on at least one pair of rotor core groups (20), and the two core supports (30) are provided with clamping grooves (31) with openings pointing to opposite directions. When the two core supports (30) are sleeved from both ends of the rotor core group (20), the clamping grooves (31) on the core supports (30) are clamped on the core protrusions (212) of the rotor core (21); The rotor core (21) is provided with a first protrusion (213) on one side and a first groove (214) on the other side, and when the rotor cores (21) are stacked, the first protrusion (213) on one rotor core (21) is embedded and matched with the first groove (214) on the adjacent rotor core (21); The clamping slot (31) comprises two parallel and spaced slot wall plates (311) extending outward from the main body of the core support (30), a slot bottom plate (312) being provided between the two slot wall plates (311), and when the core support (30) is assembled in place, the slot bottom plate (312) is in close contact with the end of the rotor core assembly (20); Adjacent ends of the two core supports (30) are provided with a second protrusion (32) and a second groove (33), wherein the second protrusion (32) at the end of one core support (30) is embedded and matched with the second groove (33) at the end of the adjacent core support (30); The second protrusion (32) is a round rod extending in the axial direction, and the second groove (33) is a cylindrical groove extending in the axial direction; The hanging end of the round rod is an arc end (34) protruding outward, and the opening end of the cylindrical groove is a flared structure; The core bracket (30) is provided with clamping parts (35) arranged at intervals along the circumferential direction and correspondingly matched with the rotor core assembly (20), and two sides of the clamping parts (35) are in close contact with two sides of the core main body (211).

2. An electric toothbrush, characterized in that: The electric toothbrush includes the electric toothbrush motor according to claim 1 .

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