A magnetic levitation motor and electric toothbrush

Abstract

The present application discloses a magnetic levitation motor and an electric toothbrush, and relates to the technical field of motor equipment and cleaning appliances. The magnetic levitation motor includes a stator assembly, a rotor assembly and a motor shaft. The stator assembly includes a stator bracket and a magnetic conductive part. The stator bracket is used to install the magnetic conductive part; the rotor assembly includes a rotor bracket and two permanent magnets arranged on the same side of the rotor bracket, and the rotor assembly is arranged on one side of the stator bracket; the motor shaft is installed on the rotor bracket; two magnetic conductive parts are arranged on the side of the magnetic conductive part close to the permanent magnet, and each magnetic conductive part corresponds to a permanent magnet and is arranged parallel to each other, and there is a gap between the magnetic conductive part and the permanent magnet, and the gap is used to provide a space for the reciprocating swing of the permanent magnet. In the present application, there is no need to reserve a specific space for the oscillating motion of the rotor assembly inside the stator assembly. While achieving the magnetic levitation of the rotor assembly, the volume of the stator assembly is small enough, thereby reducing the overall volume of the magnetic levitation motor.

Description

Technical Field

[0001] The present application relates to the technical field of motor equipment and cleaning appliances, and in particular to a magnetic levitation motor and an electric toothbrush. Background Art

[0002] At present, the existing magnetic levitation motor places the rotor assembly inside the stator assembly, so that the stator assembly and the rotor assembly wrapped inside it interact magnetically. This method requires at least three sides of the stator assembly to be reserved for the rotor assembly to oscillate. Therefore, the stator assembly needs to be set large enough to accommodate the rotor. This results in a relatively large overall volume of the magnetic levitation motor, which limits the scope of use of the magnetic levitation motor in the field of small electrical appliances, and also limits the design space of some small electrical appliances. Summary of the invention

[0003] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art. The present application provides a magnetic levitation motor to solve the technical problem of the large size of the magnetic levitation motor in the prior art.

[0004] This application provides:

[0005] A magnetic levitation motor, comprising:

[0006] A stator assembly, the stator assembly comprising a stator bracket and a magnetic conductive member, the stator bracket being used to install the magnetic conductive member;

[0007] A rotor assembly, the rotor assembly comprising a rotor support and two permanent magnets arranged on the same side of the rotor support, the rotor assembly being arranged on one side of the stator support;

[0008] A motor shaft, wherein the motor shaft is mounted on the rotor bracket;

[0009] Among them, two magnetic conductive parts are symmetrically arranged on one side of the magnetic conductive part close to the permanent magnet, each of the magnetic conductive parts is arranged parallel to a corresponding permanent magnet, and there is a gap between the magnetic conductive part and the permanent magnet, and the gap is used to provide activity space for the reciprocating swing of the permanent magnet.

[0010] In some embodiments of the present application, the distance of the gap is 0.5 mm to 1.5 mm.

[0011] In some embodiments of the present application, the maximum swing angle of the permanent magnet is 10°.

[0012] In some embodiments of the present application, the length of the permanent magnet is not less than the length of an end surface of the magnetic conductive portion close to the permanent magnet; and / or

[0013] The width of the permanent magnet is not less than the width of an end surface of the magnetic conductive portion close to the permanent magnet.

[0014] In some embodiments of the present application, an end surface on one side of the permanent magnet close to the magnetic conductive portion and an end surface on one side of the magnetic conductive portion close to the magnetic conductive portion are flat surfaces.

[0015] In some embodiments of the present application, the stator bracket is provided with a mounting position, and a receiving cavity is provided on a side of the stator bracket close to the mounting position, and the magnetic conductive member is provided at the mounting position;

[0016] An extension portion is provided at one end of the rotor support, and the extension portion is offset and extended toward the accommodating cavity so that the extension portion is located in the accommodating cavity, and the motor shaft is movably inserted into the stator support and connected with the extension portion.

[0017] In some embodiments of the present application, the magnetic levitation motor further includes an elastic member, the elastic member is passed through the rotor bracket, and two ends of the elastic member are respectively connected to the stator bracket.

[0018] In some embodiments of the present application, connecting parts are respectively provided at both ends of the elastic member, and the connecting parts are connected to the stator bracket.

[0019] In some embodiments of the present application, the elastic member is a metal spring;

[0020] The metal spring piece is a rectangular spring piece, the connecting portion is a connecting block, a slot is provided on the connecting block in the direction of the stator bracket, two ends of the metal spring piece are respectively inserted into the slot, and the connecting block is connected to the stator bracket; or

[0021] The metal spring piece is a V-shaped spring piece, and both ends of the V-shaped spring piece are bent along the radial direction away from the V-shaped spring piece to form a connecting piece, and the connecting piece is connected to the stator bracket.

[0022] The present application also provides an electric toothbrush, comprising the magnetic levitation motor described in any of the above embodiments.

[0023] Compared with the prior art, the beneficial effects of the present application are as follows: the present application proposes a magnetic levitation motor, comprising a stator assembly, a rotor assembly and a motor shaft. The stator assembly comprises a stator bracket and a magnetic conductive member arranged on the stator bracket. The rotor assembly comprises a rotor bracket and two permanent magnets arranged on the same side of the rotor bracket, and the rotor assembly is arranged on one side of the stator bracket. The motor shaft is mounted on the rotor bracket.

[0024] Among them, two magnetic conductive parts are arranged on one side of the magnetic conductive part close to the permanent magnet, and each magnetic conductive part is arranged parallel to a permanent magnet, and there is a gap between the magnetic conductive part and the permanent magnet. When the magnetic conductive part is energized, the magnetic part generates a magnetic field to pull the two permanent magnets of the rotor assembly. The two permanent magnets swing back and forth under the action of the magnetic field, so that the rotor assembly swings back and forth, thereby driving the motor shaft to swing back and forth. By locating the stator assembly on one side of the rotor assembly and arranging the stator assembly in parallel with the rotor assembly, there is no need to reserve a specific activity space for the oscillating movement of the rotor assembly inside the stator assembly. While achieving the magnetic suspension operation of the rotor assembly, the volume of the stator assembly is also small enough, thereby reducing the overall volume of the magnetic suspension motor, so that it can be suitable for different small electrical appliances. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A three-dimensional schematic diagram of an implementation of a magnetic levitation motor in some embodiments of the present application is shown;

[0027] Figure 2 A schematic diagram of a magnetic levitation motor from one perspective in some embodiments of the present application is shown;

[0028] Figure 3 Shows Figure 2 AA-direction cross-sectional structural diagram;

[0029] Figure 4 Shows Figure 1 Schematic diagram of the exploded structure of the magnetic levitation motor shown in;

[0030] Figure 5 A three-dimensional schematic diagram showing another implementation of a magnetic levitation motor in some embodiments of the present application is shown;

[0031] Figure 6 Shows Figure 5 A schematic diagram of the exploded structure of the magnetic levitation motor described in;

[0032] Figure 7 A schematic diagram showing the positional relationship between the permanent magnet and the magnetic conductive member of the magnetic levitation motor in some embodiments of the present application is shown;

[0033] Figure 8 A schematic diagram showing the swing angles of the permanent magnet and the magnetic conductive member of the magnetic levitation motor in some embodiments of the present application is shown;

[0034] Fig. 9 A schematic diagram of the magnetic field between the permanent magnet and the magnetic conductive member of the magnetic levitation motor in some embodiments of the present application is shown;

[0035] Fig.10 A schematic diagram of the structure between a single permanent magnet and a magnetic conductive member of a magnetic levitation motor in some embodiments of the present application is shown.

[0036] Description of main component symbols:

[0037] 100-magnetic levitation motor; 10-stator assembly; 11-stator bracket; 111-bottom plate; 112-end plate; 1121-fixed column; 1122-opening; 113-side plate; 1131-inclined section; 1132-horizontal section; 114-first limit block; 115-second limit block; 116-installation position; 117-accommodating chamber; 12-magnetic conductive member; 121-magnetic conductive assembly; 1211-magnetic conductive part; 1212-silicon steel sheet; 122-coil; 20-rotor assembly; 21-rotor bracket; 211-extension part; 212-through hole; 22-permanent magnet; 30-motor shaft; 40-elastic member; 41-connecting part; 411-connecting plate; 412-connecting hole; 50-screw. DETAILED DESCRIPTION

[0038] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0042] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0043] Embodiment 1

[0044] In the prior art, the magnetic levitation motor places the rotor assembly inside the stator assembly so that the stator assembly and the rotor assembly wrapped therein interact magnetically. This method requires that at least three sides of the stator assembly be reserved for the rotor assembly to vibrate. This results in the stator assembly being designed to be relatively large, making the overall volume of the magnetic levitation motor larger.

[0045] like Figures 1 to 4 As shown, in order to solve the technical problem of the large size of the above-mentioned magnetic levitation motor, the embodiment of the present application provides a magnetic levitation motor 100, which is mainly suitable for small electrical appliances such as electric toothbrushes, vacuum cleaners and household air conditioners. The magnetic levitation motor 100 includes a stator assembly 10, a rotor assembly 20 and a motor shaft 30.

[0046] The stator assembly 10 includes a stator bracket 11 and a magnetic conductive member 12 . The stator bracket 11 is used to install the magnetic conductive member 12 . The magnetic conductive member 12 is used to generate a magnetic field after being energized, so that the generated magnetic field generates a pulling force on the permanent magnet 22 of the rotor assembly 20 .

[0047] The rotor assembly 20 includes a rotor support 21 and two permanent magnets 22 arranged on the same side of the rotor support 21. The rotor assembly 20 is arranged on one side of the stator support 11, so that the rotor assembly 20 and the stator support 11 are arranged in parallel. The motor shaft 30 is installed on the rotor support 21, so that the motor shaft 30 can move with the rotor support 21.

[0048] Optionally, two permanent magnets 22 are symmetrically arranged on the rotor support 21 .

[0049] Among them, two magnetic conductive parts 1211 are symmetrically arranged on one side of the magnetic conductive part 12 close to the permanent magnet 22, each of the magnetic conductive parts 1211 is arranged parallel to one of the permanent magnets 22, and there is a gap between the magnetic conductive part 1211 and the permanent magnet 22, and the gap is used to provide sufficient activity space for the reciprocating swing of the permanent magnet 22. When the magnetic conductive part 12 is powered on, the two permanent magnets 22 can swing back and forth to drive the rotor assembly 20 to swing back and forth.

[0050] The magnetic levitation motor 100 provided in the embodiment of the present application, when the magnetic conductive part 12 is energized, the magnetic part generates a magnetic field after being energized to pull the two permanent magnets 22 of the rotor assembly 20, and the two permanent magnets 22 swing back and forth at the gap under the action of the magnetic field, so that the rotor assembly 20 swings back and forth, thereby driving the motor shaft 30 to swing back and forth. By locating the stator assembly 10 on one side of the rotor assembly 20 and arranging the stator assembly 10 and the rotor assembly 20 in parallel, there is no need to reserve a specific activity space for the oscillating movement of the rotor assembly 20 inside the stator assembly 10, and while achieving the magnetic levitation of the rotor assembly 20, the volume of the stator assembly 10 is small enough, thereby reducing the overall volume of the magnetic levitation motor 100, so that it can be applied to different small electrical appliances.

[0051] It should be noted that the magnetic conductive member 12 passes currents in different directions, so that the magnetic field generated by it has different magnetic effects on the two permanent magnets 22, thereby achieving the reciprocating swing of the two permanent magnets 22.

[0052] like Figure 3 , Figure 7 , Fig. 9 and Fig.10As shown, in some embodiments of the present application, optionally, the distance d of the gap is 0.5 mm to 1.5 mm. In this embodiment, the distance d of the gap is the distance d between the end face of the magnetic conductive part 1211 close to the permanent magnet 22 and the end face of the permanent magnet 22 close to the magnetic conductive part 1211, so that the permanent magnet 22 can swing in the gap and ensure the activity space of the permanent magnet 22. At the same time, the setting of the distance d of the gap can ensure that the magnetic field generated by the magnetic conductive part 1211 forms an effective pulling effect on the permanent magnet 22. In addition, the distance of the gap will not increase the overall volume of the magnetic levitation motor 100 due to excessive design.

[0053] Preferably, the distance d of the gap is 1.1 mm.

[0054] like Figure 8 As shown, in some embodiments of the present application, when the permanent magnet 22 is stationary, the x-axis is parallel to the direction of the permanent magnet 22, and the y-axis is perpendicular to the x-axis. Optionally, the maximum swing angle α of the permanent magnet 22 is 10°. In this embodiment, when the permanent magnet 22 is stationary, the swing angle α is 0°. When the magnetic field generated by the magnetic conductive part 1211 of the magnetic conductive part 12 forms a pulling effect on the permanent magnet 22, the maximum swing angle α is 10°. Such a maximum swing angle ensures that the permanent magnet 22 will not collide with the magnetic conductive part 1211 of the magnetic conductive part 12 when the magnetic levitation motor 100 is working, thereby avoiding damage to the parts of the magnetic levitation motor 100, improving the reliability of the product, and extending the service life of the product.

[0055] Preferably, the maximum swing angle α of the permanent magnet 22 is 8°.

[0056] like Fig. 9 and Fig.10 As shown, in some embodiments of the present application, optionally, the length of the permanent magnet 22 is not less than the length of the end face of the magnetic conductive part 1211 close to the permanent magnet 22; and / or the width of the permanent magnet 22 is not less than the width of the end face of the magnetic conductive part 1211 close to the permanent magnet 22. In this embodiment, the magnetic force will diverge laterally when it comes out of the magnetic conductive part 1211 of the magnetic conductive part 12. By making the length and width of the permanent magnet 22 greater than or equal to the length and width of the magnetic conductive part 1211, the magnetic flux area in the permanent magnet 22 is increased, thereby improving the utilization rate of the magnetic force derived from the magnetic conductive part 1211 of the magnetic conductive part 12.

[0057] It can be understood that the length direction of the permanent magnet 22 and the magnetic conductive part 1211 is parallel to the axis direction of the motor shaft 30. The width direction of the permanent magnet 22 and the magnetic conductive part 1211 is a direction perpendicular to the axis on a horizontal plane.

[0058] Preferably, the width of the permanent magnet 22 is greater than the width of the magnetic conductive portion 1211, and the difference between the width of the permanent magnet 22 and the width of the magnetic conductive portion 1211 is twice the gap. The larger the width of the magnetic conductive portion 1211 and the permanent magnet 22, the larger the magnetic sensing area, and the larger the magnetic induction force will be (similarly, the smaller the width, the smaller the other parameters will be). However, in order to ensure that the volume of the magnetic levitation motor 100 can be made smaller, the difference between the width of the permanent magnet 22 and the width of the magnetic conductive portion 1211 is twice the gap, which can not only ensure the effective effect of the magnetic induction force on the permanent magnet 22, but also ensure the overall volume of the magnetic levitation motor 100.

[0059] like Fig. 9 As shown, in some embodiments of the present application, optionally, one end surface of the permanent magnet 22 close to the magnetic conductive part 1211 and one end surface of the magnetic conductive part 1211 close to the magnetic conductive part 1211 are flat surfaces. That is, the end surfaces of the permanent magnet 22 and the magnetic conductive part 1211 facing each other are flat surfaces, so that the magnetic field generated by the magnetic conductive part 1211 of the magnetic conductive member 12 can evenly pass through the flat end surface of the magnetic conductive part 1211, thereby generating the maximum magnetic induction force, so as to effectively pull the permanent magnet 22, so that the permanent magnet 22 can swing back and forth.

[0060] like Figure 4 and Figure 6 As shown, in some embodiments of the present application, optionally, the stator support 11 is provided with a mounting position 116, and a receiving cavity 117 is provided on one side of the stator support 11 close to the mounting position 116, and the magnetic conductive member 12 is provided at the mounting position 116. An extension portion 211 is provided at one end of the rotor support 21, and the extension portion 211 is offset and extended toward the direction of the receiving cavity 117 so that the extension portion 211 is located in the receiving cavity 117, and the motor shaft 30 is movably penetrated through the stator support 11 and connected with the extension portion 211. In this embodiment, the mounting position 116 and the receiving cavity 117 are located on the same side of the stator support 11, and at the same time, the mounting position 116 and the receiving cavity 117 are arranged side by side, and the receiving cavity 117 is close to one end of the stator support 11. An opening 1122 communicating with the receiving cavity 117 is provided on the stator support 11, and the opening 1122 facilitates the passage of the motor shaft 30. Optionally, the opening 1122 may be a U-shaped groove that matches the shape of the motor shaft 30 , thereby facilitating the rotation of the motor shaft 30 and avoiding interference with the motor shaft 30 .

[0061] like Figure 4As shown, in the above embodiment, the arrangement of the accommodating cavity 117 and the opening 1122 enables the extension portion 211 to be located in the accommodating cavity 117, so that the motor shaft 30 can be located in the middle position of the whole formed by the stator bracket 11 and the rotor bracket 21, thereby reducing the overall space occupied by the rotor bracket 21 and thereby reducing the overall volume of the magnetic levitation motor 100.

[0062] like Figure 4 As shown, further, the extension portion 211 is provided with a mounting groove for mounting the motor shaft 30, one end of the motor shaft 30 is located in the mounting groove, and the shape of the mounting groove matches the shape of the end of the motor shaft 30. In addition, the two permanent magnets 22 are symmetrically arranged on both sides of the axis of the motor shaft 30 and the extension portion 211. That is, the axis of the motor shaft 30 and the extension portion 211 are on both sides of the central axis in the axis direction. Optionally, the central axis of the rotor bracket 21 and the axis of the motor shaft 30 are located in the same plane, which is the first plane. The two permanent magnets 22 are symmetrically arranged on both sides of the first plane on the rotor bracket 21.

[0063] like Figure 4 and Figure 6 As shown, in the embodiment in which the stator bracket 11 is provided with the mounting position 116 and the accommodating cavity 117, specifically, the stator bracket 11 includes a bottom plate 111 and two end plates 112. In the axial direction of the motor shaft 30, the opposite ends of the bottom plate 111 are respectively connected to the end plates 112. Among them, a U-shaped groove for the motor shaft 30 to pass through is provided on one end plate 112. In addition, two side plates 113 are formed by extending from both ends of the end plate 112 provided with the U-shaped groove toward the direction of the other end plate 112, and the two side plates 113, the bottom plate 111 and the end plate 112 provided with the U-shaped groove surround the accommodating cavity 117.

[0064] like Figure 4 As shown, optionally, the two side plates 113 are respectively inclined in the direction from the top to the bottom thereof to form an inclined section 1131, and at the same time, the bottom of the inclined section 1131 is formed in the direction of the other end plate 112 to form a horizontal section 1132. A first stop block 114 is provided on the end of the horizontal section 1132 close to the other end plate 112, and a second stop block 115 is provided on the side of the end plate 112 without the U-shaped groove close to the horizontal section 1132. The first stop block 114, the second stop block 115 and the bottom plate 111 form the installation position 116, and the magnetic conductive member 12 is provided between the first stop block 114 and the second stop block 115.

[0065] Furthermore, a guiding slope is formed on the top of the first limiting block 114 and the second limiting block 115 , and the magnetic conductive member 12 can be installed on the installation position 116 along the guiding slope, thereby improving assembly efficiency.

[0066] Furthermore, the two opposite sides of the two side panels 113 are located inside the edge of the bottom panel 111 , so that the side panels 113 , the edge of the bottom panel 111 and the end panel 112 form a groove, thereby reducing the occupied space.

[0067] In some embodiments of the present application, optionally, the magnetic levitation motor 100 further includes an elastic member 40 , wherein the elastic member 40 is passed through the rotor bracket 21 , and both ends of the elastic member 40 are respectively connected to the stator bracket 11 .

[0068] In this embodiment, the rotor support 21 is connected to the stator support 11 by the elastic member 40, and the elastic performance of the elastic member 40 can ensure that the rotor support 21 can follow the permanent magnet 22 to rotate relative to the stator support 11. On the one hand, when the magnetic levitation motor 100 is in a stationary state, the elastic member 40 can limit the permanent magnet 22 on the rotor support 21 to be adsorbed on the magnetic conductive member 12, and then limit the rotor assembly 20 to be adsorbed on the stator assembly 10. In this way, the phenomenon of the motor being stuck when the magnetic levitation motor 100 is working can be avoided, and the reliability of the product is improved. On the other hand, when the magnetic conductive member 12 is powered on to switch the pole, the elastic member 40 is used to limit the permanent magnet 22 to respond in time and quickly reverse the direction when driving the pole change, so as to avoid the permanent magnet 22 from hitting the stator assembly 10 to generate noise and lose energy when changing direction quickly.

[0069] like Figures 3 to 6 As shown, in the embodiment of the elastic member 40 of the present application, further, connecting portions 41 are respectively provided at both ends of the elastic member 40 , and the connecting portions 41 are connected to the stator bracket 11 .

[0070] In this embodiment, the two ends of the elastic member 40 are connected to the stator bracket 11 through the connecting portion 41, so that the rotor bracket 21 is fixedly connected to the stator bracket 11. Optionally, the elastic member 40 is a metal spring, which can be a rectangular spring, and the connecting portion 41 is a connecting block. A slot matching the metal spring is provided on the connecting block, and the two ends of the metal spring are respectively inserted into the slot, and the metal spring is installed with an interference fit with the slot. In order to ensure the connection strength between the metal spring and the slot, glue can be used to coordinately tighten the metal spring after the metal spring is installed in the slot. The connecting block is fixedly connected to the stator bracket 11.

[0071] Specifically, the connection block can be bolted to the stator bracket 11, such as opening a connection hole 412 on the connection block, forming a fixing column 1121 with a threaded hole at the end plate 112 of the stator bracket 11, and hanging the screw 50 into the connection hole 412 and the threaded hole on the fixing column 1121, so that the connection block is fixed to the stator bracket 11. In addition, the connection block can also be snapped with the stator bracket 11, by providing a plug-in block on the connection block, providing a plug-in slot on the end plate 112 of the stator bracket 11, and inserting the plug-in block into the plug-in slot to achieve the snap-in connection between the two, thereby achieving a fixed connection between the connection block and the stator bracket 11.

[0072] In addition, a through hole 212 for passing the metal spring is formed on the rotor support 21 . The through hole 212 penetrates the rotor support 21 along the length direction of the rotor support 21 and matches the shape of the metal spring.

[0073] like Figure 5 and Figure 6 As shown, optionally, the elastic member 40 can also be a V-shaped spring sheet. The two ends of the V-shaped spring sheet can be bent radially in a direction away from the V-shaped spring sheet to form a connecting piece 411, and the connecting piece 411 has a connecting hole 412, and the screw 50 is inserted through the connecting hole 412 to be screwed to the stator bracket 11. Of course, plug-in components can also be provided at both ends of the V-shaped spring sheet, and a plug-in slot matching the plug-in component can be provided on the stator bracket 11, so that the plug-in component and the plug-in slot are engaged, so that the elastic member 40 is fixedly connected to the stator bracket 11. In addition, the through hole 212 on the rotor bracket 21 is a V-shaped hole.

[0074] Optionally, the axis of the through hole 212 of the rotor support 21 is located on the first plane.

[0075] like Figure 3 and Figure 7 As shown, in any of the above embodiments of the present application, optionally, the magnetic conductive part 12 includes a magnetic conductive component 121 and a coil 122, the coil 122 is wound on the magnetic conductive component 121, and two magnetic conductive parts 1211 are symmetrically arranged on one side of the magnetic conductive component 121 close to the permanent magnet 22. In this embodiment, the magnetic conductive component 121 can be composed of a plurality of silicon steel sheets 1212 or magnetic steel sheets. Specifically, a plurality of silicon steel sheets 1212 are stacked in sequence to form the magnetic conductive component 121, or a plurality of magnetic steel sheets are stacked in sequence to form the magnetic conductive component 121. Among them, the silicon steel sheet 1212 is H-shaped, and the magnetic steel sheet is also H-shaped, so that the magnetic conductive component 121 formed in this way is also H-shaped. The coil 122 is wound on the H-shaped magnetic conductive component 121. The coil 122 can be optionally a copper coil 122. The top ends of the H-shaped silicon steel sheets 1212 or magnetic steel sheets respectively form magnetic conductive portions 1211 , so that the two magnetic conductive portions 1211 form a symmetrical structure.

[0076] It should be noted that the permanent magnet 22 in any of the above embodiments may be a magnet, and the cross section of the magnet may be a rectangle. The magnetic poles of the two permanent magnets 22 facing the magnetic guide portion 1211 are different, such as the end of one permanent magnet 22 facing the magnetic guide portion 1211 is an N pole, and the end of the other permanent magnet 22 facing the magnetic guide portion 1211 is an S pole.

[0077] Embodiment 2

[0078] The present application also provides an electric toothbrush, comprising the magnetic levitation motor 100 described in any one of the above embodiments.

[0079] In this embodiment, the magnetic levitation motor 100 can be used in an electric toothbrush, so that the motor shaft 30 of the magnetic levitation motor 100 is connected to the brush head of the electric toothbrush to drive the brush head to swing back and forth. Since the overall volume of the magnetic levitation motor 100 is smaller than that of existing motors, the volume of the electric toothbrush can be made smaller.

[0080] It should be noted that the magnetic levitation motor 100 can be fixed on the electric toothbrush holder through a stator holder. The stator holder can be a detachable independent structure, or the stator holder can be a part of the electric toothbrush holder to form a whole with the electric toothbrush holder.

[0081] Specifically, in the prior art, the magnetic levitation motor places the rotor assembly inside the stator assembly so that the stator assembly interacts magnetically with the rotor assembly wrapped therein. This method requires reserving at least three side activity spaces inside the stator assembly for the oscillating motion of the rotor assembly. The present application proposes a magnetic levitation motor, in which the rotor assembly is arranged on one side of the stator bracket, and the motor shaft is installed on the rotor bracket. The stator bracket can be a detachable independent structure or a part of the electric toothbrush bracket. Two magnetic conductive parts are arranged on the side of the magnetic conductive part close to the permanent magnet, and each magnetic conductive part is arranged parallel to a permanent magnet, and there is a gap between the magnetic conductive part and the permanent magnet. When the magnetic conductive part is energized, the magnetic part generates a magnetic field after being energized to pull the two permanent magnets of the rotor assembly. The two permanent magnets swing back and forth under the action of the magnetic field, so that the rotor assembly swings back and forth, thereby driving the motor shaft to swing back and forth. By locating the stator assembly on one side of the rotor assembly and arranging the stator assembly and the rotor assembly in parallel, there is no need to reserve a specific activity space inside the stator assembly for the oscillating movement of the rotor assembly. While achieving the magnetic levitation of the rotor assembly, the volume of the stator assembly is made small enough, thereby reducing the overall volume of the magnetic levitation motor and making it suitable for different small electrical appliances.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0083] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A magnetic levitation motor, characterized in that: include: A stator assembly, wherein the stator assembly comprises a stator bracket and a magnetic conductive member, wherein the stator bracket is used to install the magnetic conductive member, and the magnetic conductive member comprises a magnetic conductive member and a coil, wherein the coil is wound on the magnetic conductive member; A rotor assembly, the rotor assembly comprising a rotor support and two permanent magnets arranged on the same side of the rotor support, the rotor assembly being arranged on one side of the stator support; A motor shaft, wherein the motor shaft is mounted on the rotor bracket; An elastic member, wherein the elastic member is passed through the rotor support, and two ends of the elastic member are respectively connected to the stator support; Among them, two magnetic conductive parts are symmetrically arranged on one side of the magnetic conductive part close to the permanent magnet, each of the magnetic conductive parts is arranged parallel to a corresponding permanent magnet, and there is a gap between the magnetic conductive part and the permanent magnet, and the gap is used to provide activity space for the reciprocating swing of the permanent magnet.

2. The magnetic levitation motor according to claim 1, characterized in that: The distance of the gap is 0.5 mm to 1.5 mm.

3. The magnetic levitation motor according to claim 1, characterized in that: The maximum swing angle of the permanent magnet is 10°.

4. The magnetic levitation motor according to claim 1, characterized in that: The length of the permanent magnet is not less than the length of the end surface of the magnetic conductive portion close to the permanent magnet; and / or The width of the permanent magnet is not less than the width of an end surface of the magnetic conductive portion close to the permanent magnet.

5. The magnetic levitation motor according to claim 1, characterized in that: One end surface of the permanent magnet close to the magnetic conductive part and one end surface of the magnetic conductive part close to the magnetic conductive part are flat surfaces.

6. The magnetic levitation motor according to any one of claims 1 to 5, characterized in that: The stator bracket is provided with a mounting position, and a receiving cavity is provided on a side of the stator bracket close to the mounting position, and the magnetic conductive member is provided at the mounting position; An extension portion is provided at one end of the rotor support, and the extension portion is offset and extended toward the accommodating cavity so that the extension portion is located in the accommodating cavity, and the motor shaft is movably inserted into the stator support and connected with the extension portion.

7. The magnetic levitation motor according to claim 6, characterized in that: Both ends of the elastic member are respectively provided with connecting parts, and the connecting parts are connected to the stator bracket.

8. The magnetic levitation motor according to claim 7, characterized in that: The elastic member is a metal spring; The metal spring piece is a rectangular spring piece, the connecting portion is a connecting block, a slot is provided on the connecting block in the direction of the stator bracket, two ends of the metal spring piece are respectively inserted into the slot, and the connecting block is connected to the stator bracket; or The metal spring piece is a V-shaped spring piece, and both ends of the V-shaped spring piece are bent along the radial direction away from the V-shaped spring piece to form a connecting piece, and the connecting piece is connected to the stator bracket.

9. An electric toothbrush, characterized in that: It comprises the magnetic levitation motor as claimed in any one of claims 1 to 8.

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