Motor bracket for installing permanent magnet and coil, magnetic levitation acoustic motor and oral cleaning appliance

Abstract

The present invention provides a motor bracket for installing a permanent magnet and a coil, a magnetic levitation ultrasonic motor, and an oral cleaning appliance. Among them, in the motor bracket for installing the permanent magnet and the coil, a permanent magnet mounting portion and a coil winding portion are provided on the motor bracket. A swing gap is provided between the permanent magnet mounting portion and the coil winding portion. An iron core accommodating portion is further provided on the motor bracket. An opening is provided between the iron core accommodating portion and the swing gap, so that the iron core can extend through the opening to the swing gap. When manufacturing a motor using the motor bracket of the present invention, while ensuring miniaturization, the iron core can have a larger swing angle, providing a larger amplitude for the magnetic levitation ultrasonic motor.

Description

Technical Field

[0001] The present invention relates to the fields of micro-motor manufacturing and oral cleaning appliances, and particularly to a motor bracket for installing permanent magnets and coils, a magnetic levitation sonic motor, and an oral cleaning appliance. Background Art

[0002] In recent years, with the improvement of consumption levels, the popularization of oral care knowledge, and the continuous enrichment of product categories and functions, electric toothbrushes have become one of the fastest-growing small household appliances in China. An electric toothbrush uses the high-speed movement of a micro-motor to drive the toothbrush head to swing left and right at a high speed, generating mechanical vibrations, and its vibration frequency is the same as or close to the sonic frequency to achieve a super cleaning effect. Since an electric toothbrush mainly relies on the drive of a micro-motor to achieve cleaning, the performance of the micro-motor is one of the important factors determining the performance of the electric toothbrush.

[0003] To meet the different oral health conditions and usage habits of consumers, electric toothbrushes usually have multiple usage modes. Some usage modes require a wider amplitude to fully cover the tooth surface and achieve efficient cleaning, which requires the motor of the electric toothbrush to provide a wider amplitude. On the other hand, when purchasing an electric toothbrush, an overly large size means it is not portable enough, and being delicate and compact is the demand of many users, which requires the motor of the electric toothbrush to be miniaturized. Therefore, there is an urgent need in the market for a motor that is miniaturized and can provide a wide amplitude at the same time.

[0004] At the same time, the structure of the existing micro-motor is relatively complex and its performance is unstable. The connection quality between the rotor assembly and the stator assembly is not high, and the consistency and reliability are poor, which easily leads to failures and the electric toothbrush cannot be used normally. At the same time, the assembly is relatively cumbersome, resulting in low assembly and production efficiency of the motor. Therefore, the present invention is developed under such a background. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems existing in the prior art. On the one hand, a motor bracket for installing permanent magnets and coils is proposed. On the other hand, a magnetic levitation sonic motor is proposed. On the one hand, an oral cleaning appliance is proposed.

[0006] To solve the above problems, on the one hand, the technical solution adopted by the present invention is:

[0007] A motor bracket for installing permanent magnets and coils, the motor bracket is provided with a permanent magnet installation part and a coil winding part, a swinging gap is provided between the permanent magnet installation part and the coil winding part, the motor bracket is further provided with an iron core accommodating part for passing through a shaft rod, and an opening is provided between the iron core accommodating part and the swinging gap, so that the iron core of the rotor can extend through the opening to the swinging gap.

[0008] Preferably, a shaft rod accommodating part for passing through the shaft rod is further provided on the motor bracket, and the coil winding part includes a pair of support side walls arranged between the permanent magnet mounting part and the shaft rod accommodating part for winding the coil, and any one of the support side walls is V-shaped and open.

[0009] Preferably, the motor bracket includes: a first bracket with a first passing part provided thereon; a second bracket with a second passing part provided thereon; the first bracket and the second bracket are connected to each other so that the first passing part and the second passing part can be used to pass through the shaft rod, a part of the first bracket and a part of the second bracket together form the permanent magnet mounting part, and another part of the first bracket and another part of the second bracket together form the coil winding part; when the first bracket and the second bracket are relatively far apart, the permanent magnet mounting part is enlarged for loading and unloading the permanent magnet; when the first bracket and the second bracket are relatively close, the permanent magnet mounting part is reduced for fastening the permanent magnet.

[0010] Preferably, the permanent magnet mounting part includes four first sinking grooves provided on the first bracket, and the four first sinking grooves are arranged in a ring relative to the axis of the shaft rod; the permanent magnet mounting part further includes four second sinking grooves provided on the second bracket, and the four second sinking grooves are arranged in a ring relative to the axis of the shaft rod; any one of the first sinking grooves on the first bracket matches one of the second sinking grooves on the second bracket, and a matched first sinking groove and a second sinking groove are arranged in a direction parallel to the axis of the shaft rod.

[0011] Preferably, the opening angle C of the V-shaped support side wall satisfies 90° ≤ C < 180°.

[0012] Preferably, the first frame includes a first bottom plate, the first bottom plate is provided with two first sector-shaped annular notches symmetrically arranged with respect to the axis of the shaft, the first bottom plate is provided with four first sinking grooves symmetrically arranged with respect to the axis of the shaft on the same side, the supporting side wall includes two first side walls extending along the axis direction of the shaft and spaced apart on one side of the first sinking groove on the first bottom plate, and plug pins are provided at the upper ends of the two first side walls; the second frame includes a second bottom plate, the second bottom plate is provided with two second sector-shaped annular notches symmetrically arranged with respect to the axis of the shaft, the second bottom plate is provided with four second sinking grooves symmetrically arranged with respect to the axis on the same side, the supporting side wall includes two second side walls extending along the axis direction of the shaft and spaced apart on one side of the second sinking groove on the second bottom plate, and connection holes for inserting the plug pins are provided at the upper ends of the two second side walls; the first penetrating part is arranged on the first bottom plate, and the second penetrating part is arranged on the second bottom plate; the first sinking groove and the second sinking groove are matched to form the permanent magnet mounting part; the first side wall, the second side wall, the first bottom plate and the second bottom plate form the coil winding part. The opening angle C of the V-shaped supporting side wall satisfies 90° ≤ C < 180°.

[0013] Preferably, on the other side of the first bottom plate opposite to the first sinking groove, a first convex column is provided; on the other side of the second bottom plate opposite to the second sinking groove, a second convex column is provided.

[0014] On the other hand, a magnetic levitation sonic motor is provided, which includes a motor bracket for installing a permanent magnet and a coil in any of the foregoing solutions, a coil and a permanent magnet are installed on the motor bracket, and further includes an iron core, a shaft, a bearing and a housing, and the iron core is fixedly installed on the shaft; the shaft passes through the first penetrating part and the second penetrating part, and is fixedly connected to the housing through a bearing.

[0015] Preferably, the iron core is an I-shaped iron core, a shaft connection hole is provided in the middle of the iron core for the shaft to pass through, the iron core further includes supporting walls located on both sides of the shaft connection hole and arranged symmetrically in a straight line, and driving wings are connected to the ends of the supporting walls.

[0016] On yet another aspect, an oral cleaning appliance is provided, which is installed with the foregoing magnetic levitation sonic motor.

[0017] The present invention provides a motor bracket for mounting permanent magnets and coils. The motor bracket is provided with a permanent magnet mounting portion and a coil winding portion. A swing gap is provided between the permanent magnet mounting portion and the coil winding portion. The motor bracket is further provided with a core accommodating portion, and an opening is provided between the core accommodating portion and the swing gap, so that the core of the rotor can extend through the opening to the swing gap. In the present invention, the area for coil winding is relatively larger, so a greater magnetic force can be generated to drive the core to rotate when powered on. Second, since a stroke space for the rotor core is provided that penetrates through the permanent magnet mounting portion, a greater swing space is provided for the rotor core, thereby increasing the amplitude of the rotor. While ensuring high power and large amplitude, the present invention also has the advantage of low noise. When the motor bracket is assembled to form a motor product, and the motor with this motor bracket structure is applied to an oral cleaning appliance, naturally, the above-mentioned beneficial effects are also achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 is a perspective structural view of the motor bracket seen from one direction.

[0020] Figure 2 is one of the exploded structural views of the motor bracket.

[0021] Figure 3 is another exploded structural view of the motor bracket.

[0022] Figure 4 is a top view of the first bracket of the motor bracket.

[0023] Figure 5 is a bottom view of the second bracket of the motor bracket.

[0024] Figure 6 is a perspective structural view after winding the coil and mounting the permanent magnet on the electrode bracket.

[0025] Figure 7 is a perspective internal structural view with the housing and base of the magnetic levitation sonic motor hidden.

[0026] Figure 8 is a perspective internal structural view with the housing of the magnetic levitation sonic motor hidden

[0027] Figure 9 is a perspective structural view of the magnetic levitation sonic motor.

[0028] Figure 10 is an exploded structural view of the magnetic levitation sonic motor.

[0029] Figure 11It is a schematic axial sectional structure diagram of a magnetic levitation acoustic wave motor.

[0030] Figure 12 It is a schematic radial sectional structure diagram of a magnetic levitation acoustic wave motor.

[0031] Figure 13 It is one of the schematic diagrams of the working principle of a magnetic levitation acoustic wave motor.

[0032] Figure 14 It is another schematic diagram of the working principle of a magnetic levitation acoustic wave motor.

[0033] Figure 15 It is the third schematic diagram of the working principle of a magnetic levitation acoustic wave motor.

[0034] In the figure, 10 is the motor bracket; 11 is the plug pin; 12 is the connection hole; 13 is the fan-shaped ring opening; 20 is the coil; 30 is the permanent magnet; 40 is the iron core; 50 is the shaft rod; 60 is the upper bearing; 70 is the lower bearing; 80 is the upper cover; 90 is the base; 100 is the cavity; 801 is the mounting hole; 901 is the bearing hole; 902 is the annular step; 903 is the convex part; 101 is the first bracket; 102 is the second bracket; 1012 is the first penetrating part; 1021 is the second penetrating part; 401 is the shaft rod connection hole; 402 is the support wall; 403 is the driving wing; 4031 is the arc surface; 1011 is the first bottom plate; 1013 is the first fan-shaped ring notch; 1014 is the first sinking groove; 1015 is the first side wall; 1016 is the first baffle; 1022 is the second bottom plate; 1023 is the second fan-shaped ring notch; 1024 is the second sinking groove; 1025 is the second side wall; 1026 is the second baffle; 1066 is the swing gap; 1017 is the first convex column; 1027 is the second convex column. Detailed implementation manners

[0035] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0036] In the present invention, unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "fixation" and other terms 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 directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0037] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0038] The present invention will be further described in detail below in conjunction with the specific embodiments and the accompanying drawings.

[0039] Reference Figure 1-12 , there is shown a magnetic levitation acoustic wave motor, which includes a motor bracket 10, a coil 20 and a permanent magnet 30 are mounted on the motor bracket 10, and further includes an iron core 40, a shaft rod 50, bearings and a housing. The iron core 40 is fixedly mounted on the shaft rod 50. Specifically, the bearings include an upper bearing 60 and a lower bearing 70, and the housing includes an upper cover 80 and a base 90. The motor bracket 10 is received in a cavity 100 between the upper cover 80 and the base 90. The upper cover 80 is provided with a mounting hole 801. The outer ring of the upper bearing 60 is fitted with the mounting hole 801, and the inner ring of the upper bearing 60 is in interference fit with the shaft rod 50. The base 90 is provided with a bearing hole 901. The lower bearing 70 is mounted in the bearing hole 901 through its outer ring, and the inner ring of the lower bearing 70 is in interference fit with the shaft rod 50. The inner ring and the outer ring of the bearing can rotate relative to each other. In this way, the shaft rod 50 can move relative to the housing.

[0040] In the present invention, the iron core is fixed on the shaft rod, and the shaft rod is passed through the motor bracket. A space for accommodating the iron core and the shaft rod is formed on the motor bracket 10, that is, a space for mounting the iron core and the shaft rod is formed on the motor bracket. According to the working principle of the motor, when the iron core is driven, the shaft rod rotates accordingly. As long as this function can be achieved, the specific shapes of the iron core accommodating portion and the shaft rod accommodating portion are not limited.

[0041] In order to connect the upper cover 80 and the base 90 together, the base 90 is provided with an annular step 902 and a protruding portion 903. When the base 90 and the upper cover 80 are assembled, the protruding portion 903 is inserted into the upper cover 80, and the side wall of the upper cover 80 abuts against the step 902. In order to supply power to the coil 20, a hole or gap (not shown) for the coil 20 to pass through is provided on the base 90.

[0042] Reference Figure 1-3As shown, the motor bracket 10 includes a first bracket 101 and a second bracket 102. The first bracket and the second bracket are produced independently and are combined together during assembly. A first through portion 1012 is provided on the first bracket 101; a second through portion 1021 is provided on the second bracket 102. Specifically, as a preferred embodiment, in this embodiment, both the first through portion and the second through portion are through holes. When the first bracket and the second bracket are assembled, the first through portion 1012 and the second through portion 1021 are coaxial, so that it can be used to pass through the shaft rod 50 as a rotor component. It should be noted that the diameters of the first through portion 1012 and the second through portion 1021 are both larger than the outer diameter of the corresponding position of the shaft rod, so that the motor bracket 10 as a stator component does not contact the shaft rod 50, enabling the shaft rod 50 to swing without friction with the motor bracket 10, resulting in energy loss. In order to drive the shaft rod 50, an iron core 40 is fixedly connected to the shaft rod 50. As a preferred embodiment, in this embodiment, the iron core 40 is an I-shaped iron core. A shaft rod connection hole 401 is provided in the middle of the iron core for the shaft rod 50 to pass through. The iron core 40 further includes support walls 402 located on both sides of the shaft rod connection hole 401 and arranged symmetrically in a straight line. A driving wing 403 is connected to the end of the support wall 402. An arc surface 4031 is provided on the driving wing 403, and the arc surface 4031 forms a force-receiving surface. When the arc surface 4031 is subjected to force, the iron core can be driven to rotate. Therefore, the iron core 40 and the shaft rod 50 form the rotor of the motor. In the present invention, no coil needs to be provided on the iron core 40. It is excited by a coil located outside. After the coil is energized, a magnetic field is generated through a changing electric field, and the two ends of the iron core 40 correspondingly form an N pole and an S pole.

[0043] For the installation of the coil 20 and the permanent magnet 30, the motor bracket 10 is further described as follows. The first bracket 101 includes a first bottom plate 1011, and the first through portion 1012 is disposed on the first bottom plate 1011. The first bottom plate 1011 is provided with two first fan-shaped annular notches 1013 symmetrically arranged with respect to the axis of the first through portion 1012. Four first sunk grooves 1014 symmetrically arranged with respect to the axis of the first through portion 1012 are provided on the same side of the first bottom plate 1011. On the first bottom plate 1011, on one side of the first sunk groove 1014, two first side walls 1015 extending along the axis direction of the first through portion 1012 and spaced apart are provided. Plug pins 11 protruding along the axis direction of the first through portion 1012 are provided at the upper ends of the two first side walls 1015. First baffles 1016 are provided on the two first side walls 1015 below the plug pins 11. The second bracket 102 includes a second bottom plate 1022, and the second through portion 1021 is disposed on the second bottom plate 1022. The second bottom plate 1022 is provided with two second fan-shaped annular notches 1023 symmetrically arranged with respect to the axis of the second through portion 1021. Four second sunk grooves 1024 symmetrically arranged with respect to the axis of the second through portion 1021 are provided on the same side of the second bottom plate 1022. On the second bottom plate 1022, on one side of the second sunk groove 1024, two second side walls 1025 extending along the axis direction of the second through portion 1021 and spaced apart are provided. Connection holes 12 for inserting the plug pins 11 are provided at the upper ends of the two second side walls 1025. Second baffles 1026 are provided on the two second side walls 1025 above the connection holes 12. The first bracket 101 and the second bracket 102 can be connected by the cooperation of the plug pins 11 and the connection holes 12. As a preferred embodiment, the plug pins 11 and the connection holes 12 can be cancelled, and the first bracket 101 and the second bracket 102 can be connected together by ultrasonic or glue. The first sunk grooves 1014 and the second sunk grooves 1024 are matched to form a permanent magnet mounting portion for clamping the permanent magnet 30. As a preferred embodiment, the permanent magnet 30 is a bar magnet. One end of the bar magnet is clamped in the first sunk groove 1014, and the other end of the bar magnet is clamped in the second sunk groove 1024. Since the first bracket 101 and the second bracket 102 are of a split design, there is no need to worry about the situation where the assembly cannot be carried out due to the machining error of the bar magnet.In this embodiment, there are a total of 4 bar magnets, and their installation methods are the same. Among them, two bar magnets that are relatively close to each other form a group. In this way, two groups of permanent magnets are formed on the motor bracket 10. It should be noted that in any group of permanent magnets, the polarities of the same-side ends of the two bar magnets are opposite. In the two groups of permanent magnets, the arrangement method of one group of permanent magnets located on one side of the motor bracket is the same as that of the other group of permanent magnets located on the other side of the motor bracket. The two groups of permanent magnets are symmetrically arranged with respect to the axis of the iron core 40. In this way, when the coil 20 is not energized, the two groups of permanent magnets and the iron core are all symmetrically arranged with respect to the axis of the iron core 40.

[0044] In order to enable the iron core 40 to swing, the gaps between the two first side walls 1015 and the gaps between the two second side walls 1025 form part of the iron core stroke space. Specifically, the shapes of the gaps between the two first side walls 1015 match the shapes of the gaps between the two second side walls 1025, and both have fan-shaped openings 13 facing the permanent magnet mounting portion. Outside the fan-shaped opening 13, there are swing gaps 1066 between the ends of the first side wall 1015 and the second side wall 1025 and the corresponding permanent magnets. The driving wing 403 of the iron core 40 can extend out of the fan-shaped opening 13. When the iron core 40 swings, the driving wing 403 can swing back and forth through the swing gap 1066. Specifically, both ends of the swing gap 1066 are through. After the permanent magnets are installed, the first side wall and the second side wall do not contact the permanent magnets. Refer to Figure 12 and Figure 13 As shown, in this way, the driving wing on the iron core 40 can extend out of the swing gap 1066, thereby increasing the swing amplitude of the iron core and achieving the purpose of increasing the amplitude. There are two fan-shaped openings 13, which are symmetrically arranged at 180° with respect to the axis of the first through portion.

[0045] Refer to Figure 6 As shown, the first side wall and the second side wall form supporting side walls. The supporting side walls, the first bottom plate, and the second bottom plate form the coil winding portion. The first side wall and the second side wall are both V-shaped and open. Specifically, through the two first fan-shaped notches 1013 on the first bottom plate, the two second fan-shaped notches 1023 on the second bottom plate, the first side wall 1015 connected to the first fan-shaped notch 1013, and the second side wall 1025 connected to the second fan-shaped notch 1023, the coil 20 can be wound around the motor bracket 10. Since there are two groups of bar magnets in the present invention, for matching, through the intervals of the first baffle 1016 and the second baffle 1026, the coil is wound into two groups, which are respectively located on both sides of the first baffle 1016 and the second baffle 1026.

[0046] When the central angles of the two first fan-shaped annular notches 1013 on the first base plate and the two second fan-shaped annular notches 1023 on the second base plate are smaller, the fan-shaped openings 13 on the first base plate and the second base plate are larger, providing a larger swinging space for the iron core 40, so the iron core 40 has a larger amplitude; conversely, when the central angles of the two first fan-shaped annular notches 1013 on the first base plate and the two second fan-shaped annular notches 1023 on the second base plate are larger, the fan-shaped openings 13 on the first base plate and the second base plate are smaller, providing a smaller swinging space for the iron core 40, so the iron core 40 has a smaller amplitude. In the present invention, as a preferred embodiment, the central angles of the two first fan-shaped annular notches 1013 on the first base plate and the two second fan-shaped annular notches 1023 on the second base plate are 129 degrees.

[0047] In the present invention, as another preferred embodiment, the range of the included angle C of the first side wall that opens in a V shape satisfies 100° ≤ C < 160°, or 120° ≤ C < 140°.

[0048] In the present invention, concave surfaces are provided on both the first side wall and the second side wall, and the concave surfaces are used to match the two first fan-shaped annular notches 1013 on the first base plate and the two second fan-shaped annular notches 1023 on the second base plate. In this way, when the coil is wound, it can be distributed on the concave surfaces, and more coils can be wound on the concave surfaces.

[0049] In the present invention, on the other side of the first base plate 1011 opposite to the first sink 1014, a first convex column 1017 is provided, and the first through portion 1012 passes through the first convex column 1017; on the other side of the second base plate 1022 opposite to the second sink 1024, a second convex column 1027 is provided, and the second through portion 1021 passes through the second convex column 1027. It should be noted that the first convex column 1017 and the second convex column 1027 are made of insulating materials. As a preferred method, one end of the mounting bracket is fixed to the upper cover, and the other end is fixed to the base, thereby restricting the axial movement of the mounting bracket. It can be that convex strips are provided on the inner walls of the upper cover and the base, so as to abut against the base plate of the mounting bracket, or other designs. The main function of the convex column is to prevent the shaft rod from touching and / or damaging the enameled wire, preventing short circuit and causing the motor to be scrapped, and it is integrally injection-molded with the motor bracket, without additional insulating components, simplifying the motor structure. As a preferred embodiment, the first baffle 1016 and the second baffle 1026 of the motor bracket 10 can be cancelled. Since there are two groups of bar magnets in the present invention, for matching, through the interval between the first convex column 1017 and the second convex column 1027, the coil is wound into two groups, which are respectively located on both sides of the first baffle 1016 and the second baffle 1026.

[0050] Reference Figure 13-15As shown in the figure, the working principle of the present invention is that in the unpowered state, the suction forces of each permanent magnet on the iron core are equal, so that the iron core and the shaft rod stay at the initial position. When in use, the coil is alternately energized in different directions, N poles and S poles are generated at both ends of the coil, and act on the iron core. Under the action of the permanent magnet, the iron core leaves the central position and rotates clockwise or counterclockwise, so that the shaft rod continuously swings.

[0051] It should be noted that after the iron core and the shaft rod in the present invention are installed through bearings, neither of them contacts the motor bracket. The shaft rod contacts the upper bearing and the lower bearing, and the iron core does not contact the supporting side wall.

[0052] The magnetic levitation acoustic wave motor provided by the present invention has a simple structure, is easy to assemble, has stable performance, good connection quality between the rotor assembly and the stator assembly, high consistency and reliability, can achieve a wide amplitude while miniaturizing, and better meets the market demand. The magnetic levitation acoustic wave motor of the present invention does not need to additionally provide a shrapnel, a spring pin or a spring to fix the position of the shaft rod, simplifies the motor structure, and at the same time avoids the elastic structure absorbing the torque of the main shaft during the rotation of the main shaft, resulting in the weakening of the output power of the main shaft. The iron core can be a silicon steel body, and the iron core can be stacked by silicon steel sheets.

[0053] In the present invention, the first baffle 1016 and the second baffle 1026 on the motor bracket 10 are abutted against the inner plane wall of the upper cover 80, so as to limit the radial movement of the motor bracket, and make the connection quality between the rotor assembly and the stator assembly of the motor good, with high consistency and reliability.

[0054] The motor bracket provided by the present invention has a stable structure, can accurately and firmly install the permanent magnet, limit the position of each magnet in the circumferential direction, increase the anti-impact performance of the magnet assembly, and is beneficial to improving the passing rate of the drop test. The installation bracket has an upper and lower structure. The permanent magnet can be first installed on the first bracket or the second bracket, and then the first bracket and the second bracket are inserted, which can overcome the assembly difficulty caused by the tolerance of the permanent magnet. In addition, the motor bracket can make the rotor in its internal space have a larger swinging space, and can achieve a wide amplitude while miniaturizing the motor. The motor bracket is made of insulating plastic, and the first convex column and the second convex column are integrally injection-molded on the motor bracket, which can avoid the shaft rod from touching and / or damaging the enameled wire, prevent short circuit and cause the motor to be scrapped, and do not require additional insulating components, simplifying the motor structure. In addition, the coil is fixed on the installation bracket to become a part of the stator assembly, and can directly generate a magnetic field to drive the rotor to rotate after being energized. There is no coil on the rotor, and there is no need to conduct current through a brush. There are no problems such as coil friction and coil breakage caused by multiple rapid vibrations of the coil. There is no need for a commutator or a rectifier, with high conversion efficiency, fast speed, better performance, and longer overall life of the motor.

[0055] Of course, the foregoing embodiments are only the preferred embodiments of the present invention. It can also be implemented by other equivalent structures, as long as there is an opening between the iron core accommodating portion and the swinging gap, so that the iron core of the rotor can extend through the opening into the swinging gap. For example, the up-and-down structure of the first frame and the second frame in the present invention is changed into a left-and-right structure.

[0056] In addition, the present invention also provides an oral cleaning appliance, such as an electric toothbrush, which includes the aforementioned magnetic levitation sonic motor. During installation, the magnetic levitation sonic motor is located inside the housing of the electric toothbrush, and the shaft rod 50 can be extended to be connected to the toothbrush head. Other structures of the electric toothbrush belong to the prior art in this field and will not be elaborated here.

[0057] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "one example", "some examples", "example", "specific example", or "some examples" etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. 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 can be combined in a suitable manner in any one or more embodiments or examples.

[0058] The above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can still be made.

Claims

1. A motor bracket for installing a permanent magnet and a coil, characterized in that , the motor bracket is provided with a permanent magnet mounting portion and a coil winding portion, a swing gap is provided between the permanent magnet mounting portion and the coil winding portion, the motor bracket is further provided with an iron core accommodating portion, and an opening is provided between the iron core accommodating portion and the swing gap, so that the iron core can extend through the opening to the swing gap; The motor bracket includes: A first bracket, on which a first through portion is provided; A second bracket, on which a second through portion is provided; The first bracket and the second bracket are connected to each other so that the first through portion and the second through portion can be used to pass through the shaft rod, a part of the first bracket and a part of the second bracket together form the permanent magnet mounting portion, and another part of the first bracket and another part of the second bracket together form the coil winding portion; When the first bracket and the second bracket are relatively far apart, the permanent magnet mounting portion is enlarged for loading and unloading the permanent magnet; When the first bracket and the second bracket are relatively close, the permanent magnet mounting portion is reduced for fastening the permanent magnet.

2. The motor bracket for installing a permanent magnet and a coil according to claim 1, characterized in that , the motor bracket is further provided with a shaft rod accommodating portion for passing through the shaft rod, and the coil winding portion includes a pair of supporting side walls for winding the coil, which are arranged between the permanent magnet mounting portion and the shaft rod accommodating portion, and any one of the supporting side walls is V-shaped and open.

3. The motor bracket for installing a permanent magnet and a coil according to claim 1, characterized in that, the permanent magnet mounting portion includes four first sink grooves provided on the first bracket, and the four first sink grooves are arranged in a ring relative to the axis of the shaft rod; the permanent magnet mounting portion further includes four second sink grooves provided on the second bracket, and the four second sink grooves are arranged in a ring relative to the axis of the shaft rod; Any one of the first sink grooves on the first bracket matches one of the second sink grooves on the second bracket, and a matched first sink groove and a second sink groove are arranged in a direction parallel to the axis of the shaft rod.

4. The motor bracket for installing a permanent magnet and a coil according to claim 2, characterized in that, the opening angle C of the V-shaped supporting side wall satisfies 90° ≤ C < 180°.

5. The motor bracket for installing a permanent magnet and a coil according to claim 1, characterized in that, the first bracket includes a first bottom plate, the first bottom plate is provided with two first sector-shaped notches symmetrically arranged relative to the axis of the shaft rod, four first sink grooves symmetrically arranged relative to the axis of the shaft rod are provided on the same side of the first bottom plate, the supporting side wall includes two first side walls extending along the axis of the shaft rod and spaced apart on one side of the first sink groove on the first bottom plate, and plug pins are provided at the upper ends of the two first side walls; The second bracket includes a second bottom plate, the second bottom plate is provided with two second fan-shaped annular notches symmetrically arranged relative to the axis of the shaft rod, the second bottom plate is provided with four second sinking grooves symmetrically arranged relative to the axis on the same side, the support side wall includes two second side walls extending along the axis direction of the shaft rod and spaced apart on one side of the second sinking groove on the second bottom plate, and connection holes for inserting the insertion pins are provided at the upper ends of the two second side walls; The first penetrating portion is arranged on the first bottom plate, and the second penetrating portion is arranged on the second bottom plate; The first sinking groove and the second sinking groove are matched to form the permanent magnet mounting portion; The first side wall, the second side wall, the first bottom plate and the second bottom plate form the coil winding portion.

6. The motor bracket for installing a permanent magnet and a coil according to claim 5, characterized in that, On the other side of the first bottom plate opposite to the first sinking groove, a first convex column is provided; on the other side of the second bottom plate opposite to the second sinking groove, a second convex column is provided.

7. A magnetic levitation ultrasonic motor, characterized in that, It includes the motor bracket for installing a permanent magnet and a coil according to any one of claims 1-6, a coil and a permanent magnet are installed on the motor bracket, and further includes an iron core, a shaft rod, a bearing and a housing, the iron core is fixedly installed on the shaft rod; the shaft rod passes through the first penetrating portion and the second penetrating portion in the motor bracket for installing a permanent magnet and a coil according to any one of claims 1-6, and is fixedly connected to the housing through a bearing.

8. The magnetic levitation ultrasonic motor according to claim 7, characterized in that, The iron core is an I-shaped iron core, a shaft rod connection hole is provided in the middle of the iron core for the shaft rod to pass through, the iron core further includes support walls located on both sides of the shaft rod connection hole and arranged symmetrically in a straight line, and driving wings are connected to the ends of the support walls.

9. An oral cleaning appliance, characterized in that, It includes the magnetic levitation ultrasonic motor according to claim 7 or 8.

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