Rotor support, rotor assembly, motor, and electric toothbrush

Abstract

Disclosed in embodiments of the present application are a rotor support, a rotor assembly, a motor, and an electric toothbrush. The rotor support comprises a central shaft; and a mounting part protruding from the outer peripheral surface of the central shaft, wherein a plurality of accommodating grooves arranged at intervals around the axis of the central shaft are formed in the surface of the mounting part away from the central shaft, weight reduction grooves are further formed in the surface of the mounting part away from the central shaft, and the bottoms of the weight reduction grooves extend around the axis of the central shaft and pass through the bottom wall surfaces of the accommodating grooves. According to the present application, the provision of the weight reduction grooves in the rotor support can reduce the mass of the rotor support, and particularly, the bottoms of the weight reduction grooves extend towards the accommodating grooves, so that the mass is further reduced, the moment of inertia of the rotor support is small, and when the rotor support is applied in high-frequency forward and reverse rotation working conditions, the degree of amplitude attenuation in rotation is low, and the required power is small.

Description

Rotor bracket, rotor assembly, motor and electric toothbrush Technical Field

[0001] The present application relates to the technical field of small motors, and in particular to a rotor bracket, a rotor assembly, a motor and an electric toothbrush. Background Art

[0002] The rotor of a motor can achieve rotational motion when driven by electricity. In common applications, the motor rotates forward for a long time, or reverses for a long time after being shut down. In such applications, the angular acceleration experienced by the rotor is relatively small.

[0003] Electric toothbrushes are portable electronic devices, and the motors used in these devices are relatively small. In the electric toothbrush field, such as ultrasonic electric toothbrushes, the motor must not only be compact but also require high-frequency forward and reverse rotation. Chinese utility model patent publication CN215498605U, entitled "Electric Toothbrush Motor and Electric Toothbrush," discloses an electric toothbrush with a high-frequency forward and reverse motor. However, the rotor in this patent requires an elastic reset element to reset its forward and reverse rotation, significantly limiting its rotational frequency.

[0004] With the development of technology, an electric toothbrush has emerged that does not require the aid of elastic reset parts to help the rotor reverse and reset. The forward and reverse frequency of the rotor of this electric toothbrush is as high as 66,000 times per minute.

[0005] In high-frequency forward and reverse rotation applications, the rotor bracket is subject to significant angular acceleration. To accommodate this, the ratio of outer diameter to axial dimension of electric toothbrush motors has been reduced to lower the moment of inertia. However, the power required to maintain normal motor operation remains high, and during high-frequency forward and reverse rotation, the actual angular displacement differs significantly from the preset angular displacement, resulting in significant rotational amplitude attenuation.

[0006] Summary of the Invention

[0007] The main purpose of this application is to propose a rotor bracket, rotor assembly, motor and electric toothbrush, aiming to solve the technical problems that the existing motor bracket has a large rotational inertia, a high degree of rotation amplitude attenuation and high power required when used in high-frequency forward and reverse working conditions.

[0008] To achieve the above objectives, the rotor support proposed in this application includes:

[0009] central axis;

[0010] A mounting portion protruding from the outer peripheral surface of the central shaft; a surface of the mounting portion away from the central shaft is provided with a plurality of accommodating grooves spaced apart around the axis of the central shaft;

[0011] A material reducing groove is further provided on a surface of the mounting portion away from the central axis, and a bottom of the material reducing groove extends around the axis of the central axis and penetrates the bottom wall surface of the accommodating groove.

[0012] Preferably, the material reduction groove extends a full circle around the axis of the central shaft and is annular.

[0013] Preferably, the bottom wall surface of the material reducing trough is a rotation surface coaxial with the central axis.

[0014] Preferably, the bottom wall surface of the material reduction trough is a cylindrical surface.

[0015] Preferably, the outer diameter of the bottom wall of the material reducing groove is R1, the outer diameter of the shaft section of the central axis close to the mounting portion is R2, and R1 is greater than or equal to R2.

[0016] Preferably, the minimum distance between two adjacent accommodating grooves in the circumferential direction extending around the axis of the central axis is D1, and the minimum distance from the bottom wall surface of the accommodating groove to the outer circumferential surface of the central axis is D2, and D1 is greater than D2.

[0017] Preferably, the mounting portion includes a plurality of silicon steel sheets aligned along the axis of the central axis, and the D2 is greater than or equal to 5 mm.

[0018] Preferably, the mounting portion is integrally provided with the central axis.

[0019] Preferably, the length of the mounting portion is L1, the distance between the front end surface of the mounting portion and the front end surface of the central axis is L2, and the value of L1:L2 is [0.8, 2.5].

[0020] Preferably, a chamfer is provided at a connection between the front end surface of the mounting portion and the outer peripheral surface of the central shaft.

[0021] Preferably, a plurality of the material reducing grooves are arranged at intervals along the axis of the central shaft.

[0022] Preferably, the plurality of material reduction grooves are arranged at equal intervals along the axis of the central shaft.

[0023] Preferably, the axial widths of the material reduction grooves are equal.

[0024] Preferably, the axial width of the material reducing groove is W1, and the interval between two adjacent material reducing grooves in the direction extending along the axis of the central shaft is W2, and W1 is smaller than W2.

[0025] Preferably, the axial width of each of the material reduction grooves is set to decrease from front to back.

[0026] Preferably, the plurality of material reduction grooves are arranged along the axis of the central shaft in a dense manner at the front and sparsely at the back.

[0027] The present application also proposes a rotor assembly, including a rotor bracket and a magnet, wherein the rotor bracket is the rotor bracket described above, the magnet is fixedly arranged in the accommodating groove, the magnet covers a part of the material reduction groove, and the magnet is spaced apart from the bottom wall surface of the material reduction groove.

[0028] Preferably, the accommodating groove extends along the axis of the central shaft and is in a long strip shape and passes through the front end surface and / or the rear end surface of the mounting portion, and the magnet is axially assembled in the accommodating groove.

[0029] Preferably, a plurality of magnets spliced ​​along the axial direction are arranged in each of the accommodating grooves.

[0030] Preferably, the joint between two adjacent magnets along the direction of extension of the axis of the central shaft is arranged away from the material reduction groove.

[0031] Preferably, the axial length of the magnet is greater than the axial length of the accommodating groove, and the magnet protrudes axially from the front end surface and / or the rear end surface of the mounting portion.

[0032] Preferably, the rotor assembly further comprises a filler disposed in the material reduction groove, wherein the density of the filler is lower than the density of the mounting portion.

[0033] Preferably, the outer side surface of the magnet protrudes from the outer peripheral surface of the mounting portion, and the outer surface of the filler is flush with the outer peripheral surface of the mounting portion.

[0034] Preferably, the filler is an adhesive for fixedly connecting the magnet and the mounting portion.

[0035] The present application also proposes a motor, comprising a housing, a stator assembly and a rotor assembly, wherein the rotor assembly is the rotor assembly described above.

[0036] Preferably, the motor further comprises a detection assembly, which comprises a circuit board and a plurality of Hall sensors electrically connected to the circuit board, wherein the Hall sensors are coupled to the magnetic markers on the rotor assembly.

[0037] Preferably, the detection component is arranged at the rear end of the housing, and the housing is provided with a wire hole between the detection component and the stator component, and the wire hole is used for allowing the wires of the detection component and the stator component to pass through the housing.

[0038] The present application also proposes an electric toothbrush, comprising a handle, a motor and a brush head, wherein the motor is arranged in the inner cavity of the handle, the central axis of the rotor assembly extends out of the front end of the handle, and the brush head is installed at the front end of the central axis, characterized in that the motor is the motor as described above.

[0039] The material reduction groove provided on the rotor support of the present application can reduce the mass of the rotor support. In particular, the bottom of the material reduction groove extends toward the accommodating groove, which not only further reduces the mass but also:

[0040] First, compared with the axial extension along the central axis, it will not further weaken the supporting strength of the accommodating groove;

[0041] Second, when ferromagnetic materials are used in the mounting portion, the magnetic conductivity of the mounting portion will not be weakened;

[0042] Third, the material reduction groove and the accommodating groove are connected to each other, which makes the rotor bracket easier to process.

[0043] Since the mass of the rotor bracket of the present application is reduced, its moment of inertia is also small, so when it is used in high-frequency forward and reverse working conditions, the rotation amplitude attenuation is low and the required power is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0045] FIG1 is a schematic diagram of the front view of a motor according to an embodiment of the present invention;

[0046] FIG2 is a schematic diagram of the cross-sectional structure along line II-II in FIG1 ;

[0047] FIG3 is a schematic diagram of a partially enlarged structure of point A in FIG2 ;

[0048] FIG4 is a schematic diagram of the exploded structure of the motor in FIG1 ;

[0049] Figure 5 is an enlarged schematic diagram of the rotor assembly in Figure 4;

[0050] FIG6 is a schematic diagram of the front structure of the rotor assembly in FIG5;

[0051] FIG7 is a schematic cross-sectional view of the structure along line VII-VII in FIG6 ;

[0052] FIG8 is a schematic diagram of the exploded structure of the rotor assembly in FIG5;

[0053] FIG9 is a schematic diagram of the exploded structure of the rotor assembly in FIG5 from another angle;

[0054] FIG10 is a schematic diagram of a transverse cross-sectional structure of the rotor support in FIG5 ;

[0055] FIG11 is a schematic structural diagram of another embodiment of the rotor assembly of the present application;

[0056] FIG12 is a schematic cross-sectional view of the rotor assembly in FIG11 . DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0058] 5 to 10 , in one embodiment, the rotor support 31 proposed in this application includes:

[0059] Central axis 32;

[0060] The mounting portion 33 is protruded from the outer peripheral surface of the central shaft 32; a surface of the mounting portion 33 away from the central shaft 32 is provided with a plurality of receiving grooves 34 spaced apart around the axis of the central shaft 32;

[0061] A material reducing groove 35 is further provided on a surface of the mounting portion 33 away from the central axis 32 . The bottom of the material reducing groove 35 extends around the axis of the central axis 32 and penetrates the bottom wall of the accommodating groove 34 .

[0062] In this embodiment, the changing magnetic field drives the rotor assembly 30 to rotate, and the central shaft 32 is used to transmit the rotational motion. For example, when applied to an electric toothbrush, the front end of the central shaft 32 is used to mount the brush head.

[0063] The mounting portion 33 mounts the magnet 36a of the rotor assembly 30 through the accommodating groove 34. The mounting portion 33 is preferably made of ferromagnetic material, such as a material with high magnetic permeability, low iron loss and low hysteresis, so as to improve the efficiency of magnetic energy utilization and convert a larger proportion of magnetic energy into kinetic energy.

[0064] Since the accommodating groove 34 does not completely occupy the outer circumference of the mounting portion 33, a material reduction groove 35 can be provided in other areas of the outer circumference of the mounting portion 33. The provision of the material reduction groove 35 can reduce the mass of the rotor bracket 31. In particular, the bottom of the material reduction groove 35 extends toward the accommodating groove 34, which not only further reduces the mass, but also:

[0065] First, compared with extending along the axial direction of the central axis 32 , the supporting strength of the receiving groove 34 is not further weakened;

[0066] Second, when the mounting portion 33 is made of ferromagnetic material, the magnetic permeability of the mounting portion 33 will not be weakened;

[0067] Third, the material reduction groove 35 and the accommodating groove 34 are connected to each other, which makes the rotor bracket 31 easier to process.

[0068] Since the mass of the rotor bracket 31 of the present application is reduced, its moment of inertia is also small, so when it is applied to high-frequency forward and reverse working conditions, the rotation amplitude attenuation is low and the required power is small.

[0069] Furthermore, the material reduction groove 35 extends a full circle around the axis of the central shaft 32, forming an annular shape. In this embodiment, the mass of the rotor bracket 31 is further reduced. The annular shape of the material reduction groove 35 also facilitates processing and better dynamic balance during movement. Preferably, the bottom wall of the material reduction groove 35 is a rotating surface coaxial with the central shaft 32. Furthermore, the bottom wall of the material reduction groove 35 is a cylindrical surface.

[0070] Furthermore, referring to Figure 3 , the outer diameter of the bottom wall of the material reduction groove 35 is R1, and the outer diameter of the section of the central shaft 32 near the mounting portion 33 is R2, with R1 being greater than or equal to R2. In this embodiment, by limiting the size of R2, the material reduction groove 35 is prevented from weakening the overall bending resistance of the rotor bracket 31. Furthermore, when the mounting portion 33 is formed from multiple laminated silicon steel sheets, this arrangement facilitates the formation of a closed socket hole and the connection of the various wings of the mounting portion 33, reducing the number of parts and facilitating assembly.

[0071] Furthermore, please refer to Figures 7 and 10. The minimum distance between two adjacent receiving grooves 34 in the circumferential direction extending around the axis of the central axis 32 is D1, and the minimum distance from the bottom wall of the receiving groove 34 to the outer peripheral surface of the central axis 32 is D2. D1 is greater than D2. This is conducive to ensuring the supporting strength of the receiving groove 34. When assembling the magnet 36a, the area between the two adjacent receiving grooves 34 in the circumferential direction is not easy to deform, and assembly is easier. Preferably, the mounting portion 33 includes a plurality of silicon steel sheets that are fitted along the axis of the central axis 32, and D2 is greater than or equal to 5mm. The silicon steel sheets are formed by punching out the sheet material, and the multiple silicon steel sheets are socketed with the central axis 32 to reduce the processing cost. In addition, the silicon steel sheets have the material properties of high magnetic permeability, low iron loss and low hysteresis, which is conducive to improving the efficiency of magnetic energy utilization.

[0072] Furthermore, the mounting portion 33 is integrally formed with the central shaft 32. This further enhances the overall structural strength of the rotor bracket 31. Specifically, the integrated rotor bracket 31 can be machined using a Swiss-type CNC machine tool, also known as a mobile-spindle CNC automatic lathe, an economical milling machine, or a longitudinal lathe. This type of precision machining equipment can simultaneously perform turning, milling, drilling, boring, tapping, and engraving operations. It is primarily used for batch processing of precision hardware and non-standard shaft parts. Wire-cut machining is also possible.

[0073] Furthermore, the length of the mounting portion 33 is L1, the distance between the front end surface of the mounting portion 33 and the front end surface of the central axis 32 is L2, and the value of L1:L2 is [0.8, 2.5]. Such a setting can ensure the bending resistance of the rotor bracket 31 and ensure the reliability of the rotor bracket 31 for long-term use.

[0074] Furthermore, in order to disperse stress, a chamfer is provided at the connection between the front end surface of the mounting portion 33 and the outer peripheral surface of the central shaft 32 .

[0075] Furthermore, a plurality of material reduction grooves 35 are arranged at intervals along the axis of the central shaft 32 , so that a greater number of magnets 36 a can be arranged, thereby more efficiently and precisely controlling the rotation of the rotor assembly 30 .

[0076] Furthermore, the plurality of material reducing grooves 35 are arranged at equal intervals along the axis of the central shaft 32 , so that the rotor bracket 31 is easier to process. Preferably, the axial widths of the material reducing grooves 35 are equal.

[0077] Furthermore, in order to better strike a balance between reducing mass and ensuring structural strength, the axial width of the material reduction groove 35 is W1, and the interval between two adjacent material reduction grooves 35 in the direction extending along the axis of the central shaft 32 is W2, and W1 is smaller than W2.

[0078] Furthermore, in order to improve the comfort of using portable electronic devices, the axial width of each material reduction groove 35 is set to decrease from front to back, so that the center of mass of the rotor bracket 31 is further away from the front end of the central axis 32, thereby reducing the holding torque of the portable electronic device, for example, making the holding of a portable electronic device such as an electric toothbrush easier.

[0079] Furthermore, the plurality of material reduction grooves 35 are arranged along the axis of the central shaft 32 in a dense manner at the front and sparsely at the back. This arrangement can also make the center of mass of the rotor bracket 31 further away from the front end of the central shaft 32, thereby making it easier to hold the portable electronic device.

[0080] 5 to 10 , in one embodiment, the present application further proposes a rotor assembly 30, comprising a rotor support 31 and a magnet 36a. The rotor support 31 is the rotor support 31 described above. The magnet 36a is fixedly disposed in the accommodating groove 34. The magnet 36a covers a portion of the material reduction groove 35. The magnet 36a is spaced apart from the bottom wall of the material reduction groove 35. The specific structure of the rotor support 31 refers to the above embodiment. Since the present rotor assembly 30 adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described one by one here. In this embodiment, the magnet 36a is generally a permanent magnet 36a, and the magnets 36a in different orientations have different magnetic poles.

[0081] Furthermore, the accommodating groove 34 extends along the axis of the central axis 32 and is elongated, penetrating the front and / or rear surfaces of the mounting portion 33. The magnet 36a is axially assembled into the accommodating groove 34. In this embodiment, the elongated shape of the accommodating groove 34 avoids increasing the radial dimension and the moment of inertia. Furthermore, because the accommodating groove 34 is open on at least one side in the axial direction, and the magnet 36a can be assembled into the accommodating groove 34 along the axial opening, this embodiment also improves assembly efficiency.

[0082] 11 and 12 , in another embodiment, a plurality of magnets 36 b spliced ​​along the axial direction are provided in each receiving groove 34 , so that the axial dimension of a single magnet 36 b is smaller and thus not easily accidentally broken; and in the implementation in which the receiving groove 34 is open on both sides in the axial direction, the plurality of magnets 36 b can be assembled in the receiving groove 34 in the forward and reverse directions in the axial direction, which is conducive to improving assembly efficiency.

[0083] Furthermore, the joint seam between two adjacent magnets 36b in the direction of the axis of the central shaft 32 is arranged away from the material reduction groove 35. In this embodiment, the multiple spliced ​​magnets 36b can be better supported to avoid the ends from warping.

[0084] 5 to 12 , in the above two embodiments, the axial length of the magnets 36 a, 36 b is greater than the axial length of the accommodating groove 34, and the magnets 36 a, 36 b protrude axially from the front end surface and / or the rear end surface of the mounting portion 33, so that the magnetic cutting can be more sufficient, thereby improving the efficiency of magnetic energy utilization.

[0085] Furthermore, the rotor assembly 30 further includes a filler disposed in the material reduction groove 35, wherein the density of the filler is less than that of the mounting portion 33. In this embodiment, the filler can reduce the hollow area of ​​the rotor assembly 30, thereby reducing wind resistance and noise during rotation.

[0086] Furthermore, the outer side surfaces of the magnets 36a and 36b protrude from the outer peripheral surface of the mounting portion 33, and the outer surface of the filler is flush with the outer peripheral surface of the mounting portion 33. This can avoid interference between the mounting portion 33, the filler and the stator assembly 20 on the one hand, and further reduce operating wind resistance and noise on the other hand.

[0087] Furthermore, since the magnets 36a, 36b will be subjected to a large inertial force during operation, such as radially outward and circumferentially around the axis of the central axis 32, the filler is an adhesive that fixes the magnets 36a, 36b to the mounting portion 33 and can also improve the ability to prevent the magnets 36a, 36b from falling off.

[0088] 5 to 10 , in order to prevent the magnet 36 a from loosening along the radial direction of the central axis 32 , in one embodiment, the present application further proposes a rotor assembly 30 , which is applied to the motor 100 of a portable electronic device. The rotor assembly 30 includes a rotor bracket 31 and a magnet 36 a . The rotor bracket 31 includes a central axis 32 and a mounting portion 33 protruding from the outer circumference of the central axis 32 . A surface of the mounting portion 33 away from the central axis 32 is provided with a plurality of accommodating grooves 34 spaced apart around the axis of the central axis 32 . The magnet 36 a is fixedly disposed in the accommodating groove 34 . The accommodating groove 34 extends along the axis of the central axis 32 and is in the shape of an elongated strip and passes through the front end surface and / or the rear end surface of the mounting portion 33 . The width of the cross-sectional shape of the accommodating groove 34 is gradually reduced in the radially outward direction . The magnet 36 a is axially assembled in the accommodating groove 34 . The specific structure of the rotor bracket 31 refers to the above embodiments. Since the rotor assembly 30 adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0089] In this embodiment, the changing magnetic field drives the rotor assembly 30 to rotate, and the central shaft 32 is used to transmit the rotational motion. For example, when applied to an electric toothbrush, the front end of the central shaft 32 is used to mount the brush head.

[0090] The mounting portion 33 mounts the magnet 36a of the rotor assembly 30 through the accommodating groove 34. The mounting portion 33 is preferably made of ferromagnetic material, such as a material with high magnetic permeability, low iron loss and low hysteresis, so as to improve the efficiency of magnetic energy utilization and convert a larger proportion of magnetic energy into kinetic energy.

[0091] Since the width of the cross-section of the accommodating groove 34 is tapered in the radially outward direction, the magnet 36 a can be restricted from sliding out in the radially outward direction.

[0092] Furthermore, to facilitate the processing of the accommodating groove 34 on the rotor bracket 31 having a small ratio of outer diameter to axial dimension, the two opposing walls of the accommodating groove 34 are inclined relative to the bottom wall of the accommodating groove 34. To better achieve dynamic balance, the cross-sectional shape of the accommodating groove 34 is preferably symmetrically arranged on two opposing sides.

[0093] Furthermore, in order to strengthen the fixation of the magnet 36a, a glue storage groove is opened on the bottom wall of the accommodating groove 34, and the magnet 36a covers the glue storage groove. The rotor assembly 30 also includes an adhesive filled between the magnet 36a and the bottom wall of the glue storage groove, and the adhesive fixedly connects the magnet 36a and the mounting portion 33.

[0094] Furthermore, to reduce the rotational inertia of rotor bracket 31, a hollow groove is provided on the surface of mounting portion 33 away from central axis 32. To facilitate processing and further reduce the rotational inertia of rotor bracket 31, the hollow groove is connected to the adhesive reservoir, and adhesive is also filled in the hollow groove. The density of the filler is lower than that of mounting portion 33.

[0095] Furthermore, to avoid interference between the rotor assembly 30 and the stator assembly 20 and to reduce air resistance and noise, the outer side surface of the magnet 36 a protrudes from the outer circumference of the mounting portion 33 , and the outer surface of the filler is flush with the outer circumference of the mounting portion 33 .

[0096] 11 and 12 , in another embodiment, in the circumferential direction extending around the axis of the central shaft 32, the glue storage grooves and the hollow grooves are connected to each other in a ring shape, which makes the processing of the glue storage grooves and the hollow grooves simpler; each receiving groove 34 is provided with a plurality of magnets 36b spliced ​​along the axial direction, and the splicing seam of two adjacent magnets 36b in the direction extending along the axis of the central shaft 32 deviates from the setting of the glue storage groove, so as to avoid the magnet 36b being too long and easy to break, and, in the implementation in which the receiving groove 34 is open on both sides in the axial direction, the plurality of magnets 36b can be assembled in the receiving groove 34 in the forward and reverse directions of the axial direction, and the splicing seam of the magnet 36b deviates from the setting of the glue storage groove so that the spliced ​​magnets 36b can be better supported and the end can be prevented from warping.

[0097] 7 and 10 , in the circumferential direction extending around the axis of the central shaft 32, the glue storage grooves and the hollow grooves are connected in pairs to form a ring shape; the minimum distance between two adjacent accommodating grooves 34 in the circumferential direction extending around the axis of the central shaft 32 is D1, and the minimum distance from the bottom wall surface of the accommodating groove 34 to the outer peripheral surface of the central shaft 32 is D2, and D1 is greater than D2. This is conducive to ensuring the supporting strength of the accommodating groove 34. When assembling the magnet 36a, the area between the two adjacent accommodating grooves 34 in the circumferential direction is not easily deformed, and assembly is easier.

[0098] 1 to 4 , the present application further proposes a motor 100 comprising a housing 10, a stator assembly 20, and a rotor assembly 30, wherein the rotor assembly 30 is the rotor assembly 30 described above. The specific structure of the rotor assembly 30 is referred to the above embodiment. Since the present motor 100 adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. In this embodiment, the housing 10 is used to provide support and protection for the components inside it, and the stator assembly 20 generally includes a winding frame and a coil winding wound on the winding frame.

[0099] Furthermore, the motor 100 further includes a detection assembly 40 , which includes a circuit board 41 and a plurality of Hall sensors 42 electrically connected to the circuit board 41 . The Hall sensors 42 are coupled to the magnetic markers 50 on the rotor assembly 30 .

[0100] In this embodiment, the circuit board 41 is used to process the signal received by the Hall sensor 42 and then transmit it to the next-level control unit; the magnetic marker 50 can be the magnets 36a, 36b on the rotor assembly 30, or it can be a magnetic attraction member located on the outside of the bearing as shown in Figures 3 and 4. This setting can be away from the stator assembly 20 and can generate a targeted magnetic field, thereby making the magnetic detection more accurate.

[0101] Furthermore, the detection assembly 40 is disposed at the rear end of the housing 10. The housing 10 is provided with a lead hole 11 between the detection assembly 40 and the stator assembly 20. The lead hole 11 is used to allow the lead wires of the detection assembly 40 and the stator assembly 20 to pass through the housing 10. This can shorten the lead distance and facilitate the fixation of the motor 100, that is, the rear end surface of the motor 100 can be more conveniently used to fix the motor 100.

[0102] This application also proposes a motor 100 for a portable electronic device, comprising a housing 10, a stator assembly 20, and a rotor assembly 30, wherein the rotor assembly 30 is the above-mentioned rotor assembly 30. The specific structure of the rotor assembly 30 refers to the above-mentioned embodiments. Since this motor 100 adopts all the technical solutions of all the above-mentioned embodiments, it also has all the beneficial effects brought about by the technical solutions of the above-mentioned embodiments, and will not be described in detail here. In this embodiment, the portable electronic device can be an electric toothbrush, a hair dryer, a small vacuum cleaner, etc.; the housing 10 is used to provide support and protection for the internal components thereof, and the stator assembly 20 generally includes a winding frame and a coil winding wound on the winding frame.

[0103] The present application also proposes an electric toothbrush (not shown), comprising a handle, a motor 100 and a brush head. The motor 100 is disposed in the inner cavity of the handle, the central axis 32 of the rotor assembly 30 extends from the front end of the handle, and the brush head is mounted on the front end of the central axis 32. The motor 100 is the motor 100 described above. The specific structure of the motor 100 refers to the above embodiment. Since this electric toothbrush adopts all the technical solutions of all the above embodiments, it also has all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described one by one here. In this embodiment, the handle is generally configured as a long strip that is easy to hold, and the brush head can be detachably fixed to the central axis 32.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A rotor support, comprising: Central axis; A mounting portion protrudes from the outer peripheral surface of the central axis; a surface of the mounting portion away from the central axis is provided with a plurality of accommodating grooves arranged at intervals around the axis of the central axis; It is characterized in that A material reduction groove is further provided on a surface of the mounting portion away from the central axis, and a bottom of the material reduction groove extends around the axis of the central axis and penetrates through the bottom wall surface of the accommodating groove.

2. The rotor support according to claim 1, characterized in that: The material reduction groove extends a full circle around the axis of the central shaft and is annular.

3. The rotor support according to claim 2, characterized in that: The bottom wall surface of the material reduction trough is a rotation surface coaxial with the central axis.

4. The rotor support according to claim 3, characterized in that: The bottom wall surface of the material reduction trough is a cylindrical surface.

5. The rotor support according to claim 4, characterized in that: The outer diameter of the bottom wall of the material reducing groove is R1, the outer diameter of the shaft section of the central axis close to the mounting portion is R2, and R1 is greater than or equal to R2.

6. The rotor support according to claim 5, characterized in that: The minimum distance between two adjacent receiving grooves in the circumferential direction extending around the axis of the central axis is D1, and the minimum distance from the bottom wall surface of the receiving groove to the outer peripheral surface of the central axis is D2, and D1 is greater than D2.

7. The rotor support according to claim 6, characterized in that: The mounting portion includes a plurality of silicon steel sheets that are aligned along the axis of the central axis, and the D2 is greater than or equal to 5 mm.

8. The rotor support according to claim 1, characterized in that: The mounting portion is integrally arranged with the central axis.

9. The rotor support according to claim 8, characterized in that: The length of the mounting portion is L1, the distance between the front end surface of the mounting portion and the front end surface of the central axis is L2, and the value of L1:L2 is in the range of [0.8, 2.5].

10. The rotor support according to claim 9, characterized in that: A chamfer is provided at a connection between the front end surface of the mounting portion and the outer peripheral surface of the central axis.

11. The rotor support according to any one of claims 1 to 10, characterized in that: A plurality of the material reducing grooves are arranged at intervals along the axis of the central shaft.

12. The rotor support according to claim 11, characterized in that: The plurality of material reduction grooves are arranged at equal intervals along the axis of the central shaft.

13. The rotor support according to claim 12, characterized in that: The axial widths of the material reduction grooves are equal.

14. The rotor support according to claim 13, characterized in that: The axial width of the material reducing groove is W1, and the interval between two adjacent material reducing grooves in the direction extending along the axis of the central shaft is W2, and W1 is smaller than W2.

15. The rotor support according to claim 12, characterized in that: The axial width of each of the material reduction grooves is set to decrease from front to back.

16. The rotor support according to claim 11, characterized in that: The plurality of material reduction grooves are arranged along the axis of the central shaft in a dense arrangement at the front and sparse arrangement at the back.

17. A rotor assembly, comprising a rotor support and a magnet, characterized in that: The rotor bracket is the rotor bracket according to any one of claims 1 to 16, the magnet is fixedly arranged in the accommodating groove, the magnet covers a part of the material reduction groove, and the magnet is spaced apart from the bottom wall surface of the material reduction groove.

18. The rotor assembly according to claim 17, wherein: The receiving groove extends along the axis of the central axis and is in a long strip shape and penetrates the front end surface and / or the rear end surface of the mounting portion. The magnet is axially mounted in the receiving groove.

19. The rotor assembly of claim 18, wherein: A plurality of magnets spliced ​​along the axial direction are arranged in each of the accommodating grooves.

20. The rotor assembly of claim 17, wherein: The joint seams of two adjacent magnets along the direction of the axis of the central shaft are arranged away from the material reduction groove.

21. The rotor assembly of claim 19, wherein: The axial length of the magnet is greater than the axial length of the receiving groove, and the magnet protrudes axially from the front end surface and / or the rear end surface of the mounting portion.

22. The rotor assembly according to any one of claims 17 to 21, characterized in that: The rotor assembly further includes a filler disposed in the material reduction groove, wherein the density of the filler is less than the density of the mounting portion.

23. The rotor assembly of claim 22, wherein: The outer side surface of the magnet protrudes from the outer peripheral surface of the mounting portion, and the outer surface of the filler is flush with the outer peripheral surface of the mounting portion.

24. The rotor assembly of claim 22, wherein: The filler is an adhesive that fixes and connects the magnet and the mounting portion.

25. A motor, comprising a housing, a stator assembly and a rotor assembly, characterized in that: The rotor assembly is the rotor assembly according to any one of claims 17-24.

26. The electric machine according to claim 25, characterized in that The motor further comprises a detection component, wherein the detection component comprises a circuit board and a plurality of Hall sensors electrically connected to the circuit board, wherein the Hall sensors are coupled to magnetic marks on the rotor component.

27. The electric machine according to claim 26, characterized in that The detection component is arranged at the rear end of the housing, and the housing is provided with a lead hole between the detection component and the stator component, and the lead hole is used for allowing the lead wires of the detection component and the stator component to pass through the housing.

28. An electric toothbrush, comprising a handle, a motor and a brush head, wherein the motor is disposed in an inner cavity of the handle, the central axis of the rotor assembly extends out of the front end of the handle, and the brush head is mounted on the front end of the central axis, characterized in that: The motor is a motor as described in any one of claims 25-27.

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