Rotor support, rotor assembly, motor and electric toothbrush

Abstract

The embodiment of the invention discloses a rotor support, a rotor assembly, a motor and an electric toothbrush. The mounting part is convexly arranged on the outer peripheral surface of the central shaft; a plurality of accommodating grooves which are arranged around the axis of the central shaft at intervals are formed in the surface, far away from the central shaft, of the mounting part; a material reducing groove is further formed in the surface, away from the center shaft, of the mounting part, and the bottom of the material reducing groove extends around the axis of the center shaft and penetrates through the bottom wall face of the containing groove. According to the rotor support, the material reducing groove is formed in the rotor support, the mass of the rotor support can be reduced, particularly, the bottom of the material reducing groove extends towards the containing groove, the mass is further reduced, the rotational inertia is small, and therefore the rotation amplitude attenuation degree is low and the needed power is small when the rotor support is applied to the working condition of high-frequency positive and negative rotation.

Description

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 the 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 to which the rotor is subjected is relatively small.

[0003] An electric toothbrush is a portable electronic device, and the motor used in the portable electronic device is relatively small. In the field of electric toothbrushes, such as ultrasonic electric toothbrushes, the motor must not only be small in size but also have high-frequency forward and reverse rotation. The Chinese utility model patent document entitled Electric Toothbrush Motor and Electric Toothbrush, with the publication number CN215498605U, discloses an electric toothbrush with a high-frequency forward and reverse rotation motor. However, in the patent document, the forward and reverse resetting of the rotor requires the aid of an elastic resetting member, which greatly limits the rotation frequency of the rotor.

[0004] With the development of technology, an electric toothbrush has appeared that does not require the aid of an elastic reset member to help the rotor to reset forward and reverse. 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 applications, the angular acceleration that the rotor bracket has to bear is relatively large. In order to adapt to this working condition, the ratio of the outer diameter to the axial size of the motor used in the electric toothbrush has been reduced to reduce the moment of inertia, but the power required to maintain the normal operation of the motor is still large, and during high-frequency forward and reverse rotation, the actual angular displacement is significantly different from the preset angular displacement, that is, there is a large rotation amplitude attenuation. Summary of the invention

[0006] The main purpose of the present application is to propose a rotor bracket, a rotor assembly, a motor and an 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 a large power required when used in high-frequency forward and reverse working conditions.

[0007] To achieve the above objectives, the rotor bracket proposed in this application includes:

[0008] Central axis;

[0009] 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;

[0010] 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.

[0011] Preferably, the material reduction groove extends a full circle around the axis of the central shaft and is annular.

[0012] Preferably, the bottom wall surface of the material reduction trough is a rotation surface coaxial with the central axis.

[0013] Preferably, the bottom wall surface of the material reduction trough is a cylindrical surface.

[0014] 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.

[0015] Preferably, the minimum distance between two adjacent accommodating grooves in the circumferential direction extending around the axis of the central axis is D1, 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.

[0016] Preferably, the mounting portion includes a plurality of silicon steel sheets that are fitted along the axis of the central axis, and the D2 is greater than or equal to 5 mm.

[0017] Preferably, the mounting portion is integrally arranged with the central axis.

[0018] 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].

[0019] 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 axis.

[0020] Preferably, a plurality of the material reduction grooves are arranged at intervals along the axis of the central shaft.

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

[0022] Preferably, the axial widths of the material reduction grooves are equal.

[0023] 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.

[0024] Preferably, the axial width of each of the material reducing grooves is set to decrease from front to back.

[0025] Preferably, 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.

[0026] 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.

[0027] Preferably, the receiving groove extends along the axis of the central axis 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 receiving groove.

[0028] Preferably, a plurality of magnets spliced ​​along the axial direction are arranged in each of the accommodating grooves.

[0029] Preferably, the joint seam between two adjacent magnets in the direction extending along the axis of the central shaft is arranged away from the material reduction groove.

[0030] Preferably, 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.

[0031] Preferably, the rotor assembly further comprises a filler disposed in the material reducing groove, and the density of the filler is lower than the density of the mounting portion.

[0032] 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.

[0033] Preferably, the filler is an adhesive that fixes the magnet and the mounting portion.

[0034] 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 as described above.

[0035] Preferably, 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, and the Hall sensors are coupled to magnetic markers on the rotor component.

[0036] Preferably, 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.

[0037] The present application also proposes an electric toothbrush, comprising a handle, a motor and a brush head, wherein the motor is disposed 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.

[0038] The material reduction groove is provided on the rotor support of the present application to 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:

[0039] First, compared with the axial extension along the central axis, the supporting strength of the receiving groove will not be further weakened;

[0040] Second, when the mounting part is made of ferromagnetic material, the magnetic conductivity of the mounting part will not be weakened;

[0041] Thirdly, the material reduction groove and the accommodating groove are connected to each other, which also makes the rotor bracket easier to process.

[0042] Since the mass of the rotor bracket of the present application is reduced, its moment of inertia is also small, so that when it is applied to high-frequency forward and reverse working conditions, the rotation amplitude attenuation is low and the required power is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. 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.

[0044] Figure 1 This is a schematic diagram of the main structure of an embodiment of a motor of the present application;

[0045] Figure 2 for Figure 1 A schematic diagram of the cross-sectional structure along line II-II;

[0046] Figure 3 for Figure 2 A schematic diagram of the local enlarged structure at point A in the middle;

[0047] Figure 4 for Figure 1 Schematic diagram of the exploded structure of the motor;

[0048] Figure 5 for Figure 4 An enlarged structural diagram of the middle rotor assembly;

[0049] Figure 6 for Figure 5 A schematic diagram of the main structure of the middle rotor assembly;

[0050] Figure 7 for Figure 6 A schematic diagram of the cross-sectional structure along line VII-VII;

[0051] Figure 8 Schematic diagram of the exploded structure of the rotor assembly 5;

[0052] Fig. 9 It is a schematic diagram of the exploded structure of the rotor assembly in 5 from another angle;

[0053] Fig.10 for Figure 5 A schematic diagram of a transverse cross-sectional structure of a middle rotor support;

[0054] Fig.11 This is a schematic structural diagram of another embodiment of the rotor assembly of the present application;

[0055] Fig.12 for Fig.11 Schematic diagram of the cross-sectional structure of the mid-rotor assembly. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0057] Reference Figures 5 to 10 In one embodiment, the rotor support 31 proposed in the present application includes:

[0058] Central axis 32;

[0059] The mounting portion 33 is convexly disposed on the outer peripheral surface of the central axis 32; a surface of the mounting portion 33 away from the central axis 32 is provided with a plurality of receiving grooves 34 arranged at intervals around the axis of the central axis 32;

[0060] 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 surface of the accommodating groove 34 .

[0061] 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 install the brush head.

[0062] 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.

[0063] Since the arrangement of the receiving 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 arrangement 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 receiving groove 34, which not only further reduces the mass, but also:

[0064] First, compared with the axial extension along the central axis 32, the supporting strength of the receiving groove 34 will not be further weakened;

[0065] Second, when the mounting portion 33 is made of ferromagnetic material, the magnetic conductivity of the mounting portion 33 will not be weakened;

[0066] Thirdly, the material reduction groove 35 and the accommodating groove 34 are connected to each other, which also makes the rotor bracket 31 easier to process.

[0067] The rotor bracket 31 of the present application has a smaller mass and therefore a smaller moment of inertia. Therefore, when the rotor bracket 31 is used in high-frequency forward and reverse rotation conditions, the rotation amplitude attenuation is low and the required power is small.

[0068] Furthermore, the material reduction groove 35 extends a full circle around the axis of the central axis 32 and is annular. In this embodiment, the mass of the rotor bracket 31 is further reduced, and the annular shape of the material reduction groove 35 is also conducive to processing and better dynamic balance during movement. Preferably, the bottom wall surface of the material reduction groove 35 is a revolving surface coaxial with the central axis 32. Furthermore, the bottom wall surface of the material reduction groove 35 is a cylindrical surface.

[0069] Please also refer to Figure 3 , the outer diameter of the bottom wall of the material reduction groove 35 is R1, the outer diameter of the shaft section of the central axis 32 close to the mounting portion 33 is R2, and R1 is greater than or equal to R2. In this embodiment, by limiting the size of R2, it is possible to avoid the setting of the material reduction groove 35 weakening the overall bending resistance of the rotor bracket 31; and when the mounting portion 33 is composed of multiple silicon steel sheets, this setting is also convenient for forming a closed socket hole and connecting the various wings of the mounting portion 33, reducing the number of parts and components, thereby facilitating assembly.

[0070] Please also refer to Figure 7 and Fig.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 surface of the receiving groove 34 to the outer peripheral surface of the central axis 32 is D2, and D1 is greater than D2, which is conducive to ensuring the supporting strength of the receiving groove 34. When assembling the magnet 36a, the part between the two adjacent receiving grooves 34 in the circumferential direction is not easy to deform, and the assembly is easier to carry out. 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 sheet is formed by punching a plate, and multiple silicon steel sheets are connected to the central axis 32 to reduce the processing cost. In addition, the silicon steel sheet has the material properties of high magnetic permeability, low iron loss and low hysteresis, which is conducive to improving the efficiency of magnetic energy utilization.

[0071] Furthermore, the mounting portion 33 is integrally arranged with the central axis 32. This is more conducive to ensuring the overall structural strength of the rotor bracket 31. Specifically, the integrated rotor bracket 31 can be made of a central CNC machine tool, which can also be called a spindle box mobile CNC automatic lathe, an economical turning and milling compound machine tool, or a longitudinal cutting lathe. It is a precision processing equipment that can complete compound processing such as turning, milling, drilling, boring, tapping, and engraving at the same time. It is mainly used for batch processing of precision hardware and shaft-type special-shaped non-standard parts), and slow wire walking is also possible.

[0072] 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.

[0073] Furthermore, in order to disperse stress, a chamfer is provided at a connection between the front end surface of the mounting portion 33 and the outer peripheral surface of the central shaft 32 .

[0074] 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 .

[0075] 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 support 31 is easier to process. Preferably, the axial widths of the material reducing grooves 35 are equal.

[0076] 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.

[0077] 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 farther away from the front end of the central axis 32, thereby reducing the holding torque of the portable electronic device, for example, making it easier to hold a portable electronic device such as an electric toothbrush.

[0078] 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.

[0079] Reference Figures 5 to 10 In one embodiment, the present application further proposes a rotor assembly 30, including a rotor bracket 31 and a magnet 36a, wherein the rotor bracket 31 is the rotor bracket 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, and the magnet 36a is spaced apart from the bottom wall surface of the material reduction groove 35. The specific structure of the rotor bracket 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 by the technical solutions of the above embodiments, which will not be described one by one here. In this embodiment, the magnet 36a is usually a permanent magnet 36a, and the magnets 36a in different orientations have different magnetic poles.

[0080] Furthermore, the receiving groove 34 extends along the axis of the central axis 32 and is in a strip shape and penetrates the front end surface and / or the rear end surface of the mounting portion 33, and the magnet 36a is axially assembled in the receiving groove 34. In this embodiment, the receiving groove 34 is in a strip shape so as to avoid increasing the radial dimension and the moment of inertia, and because the receiving groove 34 is open on at least one side in the axial direction, and the magnet 36a can be assembled in the receiving groove 34 along the axial opening, this embodiment is also conducive to improving assembly efficiency.

[0081] Reference Fig.11 and Fig.12 In another embodiment, a plurality of magnets 36b connected along the axial direction are arranged in each receiving groove 34, so that the axial dimension of a single magnet 36b is small and it is not easy to break accidentally; 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 in the axial direction, which is conducive to improving the assembly efficiency.

[0082] Furthermore, the joint seam between two adjacent magnets 36b in the direction extending along the axis of the central axis 32 is arranged to deviate from the material reduction groove 35. In this embodiment, the plurality of spliced ​​magnets 36b can be better supported to avoid the ends from warping.

[0083] Reference Figures 5 to 12In the above two embodiments, the axial length of the magnets 36a, 36b is greater than the axial length of the accommodating groove 34, and the magnets 36a, 36b 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 magnetic energy utilization efficiency.

[0084] Furthermore, the rotor assembly 30 further includes a filler disposed in the material reduction groove 35, and the density of the filler is less than the density 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.

[0085] Furthermore, the outer side surfaces of the magnets 36a, 36b protrude from the outer circumferential surface of the mounting portion 33, and the outer surface of the filler is flush with the outer circumferential 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 can further reduce operating wind resistance and noise on the other hand.

[0086] Furthermore, since the magnets 36a, 36b will be subjected to larger inertial forces 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 enhance the ability to prevent the magnets 36a, 36b from falling off.

[0087] Reference Figures 5 to 10 In order to prevent the magnet 36a 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 36a. The rotor bracket 31 includes a central axis 32 and a mounting portion 33 protruding from the outer peripheral surface of the central axis 32. The surface of the mounting portion 33 away from the central axis 32 is provided with a plurality of receiving grooves 34 arranged at intervals around the axis of the central axis 32; the magnet 36a is fixedly arranged in the receiving groove 34; the receiving groove 34 extends along the axis of the central axis 32 and is in a long strip shape and passes through the front end face and / or the rear end face of the mounting portion 33; the width of the cross-sectional shape of the receiving groove 34 is gradually reduced in the radial outward direction; the magnet 36a is axially assembled in the receiving groove 34. The specific structure of the rotor bracket 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 by the technical solutions of the above embodiments, which will not be repeated here.

[0088] 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 install the brush head.

[0089] 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.

[0090] Since the width of the cross-sectional shape of the receiving groove 34 is gradually reduced in the radially outward direction, the magnet 36 a can be restricted from sliding out in the radially outward direction.

[0091] Furthermore, in order to facilitate the processing of the accommodating groove 34 on the rotor bracket 31 having a small ratio of the outer diameter to the axial dimension, the two opposite side walls of the accommodating groove 34 are inclined relative to the bottom wall of the accommodating groove 34. In order to better achieve dynamic balance, preferably, the two opposite sides of the cross-sectional shape of the accommodating groove 34 are symmetrically arranged.

[0092] 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.

[0093] Furthermore, in order to reduce the moment of inertia of the rotor bracket 31, a hollow groove is provided on the surface of the mounting portion 33 away from the central axis 32. In order to facilitate processing and further reduce the moment of inertia of the rotor bracket 31, the hollow groove is connected to the glue storage groove, and the adhesive is also filled in the hollow groove, and the density of the filler is less than the density of the mounting portion 33.

[0094] Furthermore, in order to avoid interference between the rotor assembly 30 and the stator assembly 20 and 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 .

[0095] Reference Fig.11 and Fig.12 In another embodiment, in the circumferential direction extending around the axis of the central axis 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 accommodating 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 axis 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 of the accommodating groove 34 being open on both sides in the axial direction, a plurality of magnets 36b can be assembled in the accommodating 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 curling up.

[0096] Reference Figure 7 and Fig.10 In the circumferential direction extending around the axis of the central axis 32, the rubber storage grooves and the hollow grooves are connected to each other in a ring shape; the minimum distance between two adjacent accommodating 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 surface of the accommodating groove 34 to the outer peripheral surface of the central axis 32 is D2, and D1 is greater than D2, which 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 easy to deform, and assembly is easier.

[0097] Reference Figures 1 to 4 The present application also 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 as described above. The specific structure of the rotor assembly 30 refers to the above embodiment. Since the motor 100 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. 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.

[0098] 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 , and the Hall sensors 42 are coupled to the magnetic markers 50 on the rotor assembly 30 .

[0099] 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 can be Figure 3 and Figure 4 The magnetic attraction member shown is located outside the bearing. This arrangement can be away from the stator assembly 20 and can generate a targeted magnetic field, thereby making the magnetic detection more accurate.

[0100] Furthermore, the detection assembly 40 is arranged at the rear end of the housing 10, and the housing 10 is provided with a lead hole 11 between the detection assembly 40 and the stator assembly 20, and the lead hole 11 is used for the lead wires of the detection assembly 40 and the stator assembly 20 to pass through the housing 10, so that the lead wire distance can be shortened and the fixing of the motor 100 can be facilitated, that is, the rear end face of the motor 100 can be used to fix the motor 100 more conveniently.

[0101] The present 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 rotor assembly 30 above. The specific structure of the rotor assembly 30 refers to the above embodiment. Since the motor 100 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. 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 its internal components, and the stator assembly 20 generally includes a winding frame and a coil winding wound on the winding frame.

[0102] The present application also proposes an electric toothbrush (not shown), including a handle, a motor 100 and a brush head, wherein the motor 100 is arranged in the inner cavity of the handle, the central axis 32 of the rotor assembly 30 extends out of the front end of the handle, the brush head is installed at the front end of the central axis 32, and the motor 100 is the motor 100 as described above. The specific structure of the motor 100 refers to the above embodiment. Since the electric toothbrush 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. In this embodiment, the handle is generally arranged in a long strip shape that is convenient to hold, and the brush head can be detachably fixed to the central axis 32.

[0103] 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 it. 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, include: 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, It is 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, It is 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, It is characterized in that The bottom wall surface of the material reduction trough is a cylindrical surface.

5. The rotor support according to claim 4, It is 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, It is 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, It is 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, It is characterized in that The mounting portion is integrally arranged with the central axis.

9. The rotor support according to claim 8, It is 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, It is 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, It is 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, It is 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, It is characterized in that The axial widths of the material reduction grooves are equal.

14. The rotor support according to claim 13, It is 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, It is 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, It is 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, It is 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 of claim 17, It is characterized in that The receiving groove extends along the axis of the central axis and is in a long strip shape and passes through the front end surface and / or the rear end surface of the mounting portion. The magnet is axially assembled in the receiving groove.

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

20. The rotor assembly of claim 17, It is characterized in that 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, It is characterized in that 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. A rotor assembly according to any one of claims 17 to 21, It is 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, It is characterized in that 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, It is characterized in that 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, It is 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, It is 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 markers on the rotor component.

27. The electric machine according to claim 26, It is 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 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. It is characterized in that The motor is a motor as described in any one of claims 25-27.

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