Motor and electric toothbrush with same

Abstract

The utility model discloses a motor and an electric toothbrush with the same. The motor comprises a rotor assembly; the stator assembly sleeves the rotor assembly, the rotor assembly can rotate relative to the stator assembly, the stator assembly comprises a magnet yoke and a permanent magnet, the inner surface of the magnet yoke is provided with a mounting groove, and the permanent magnet is arranged in the mounting groove; and in the depth direction of the mounting groove, the size H1, located in the mounting groove, of the permanent magnet is not larger than the size H2, located outside the mounting groove, of the permanent magnet. According to the motor provided by the embodiment of the invention, the loss of magnetic induction lines of the permanent magnets is reduced while the volume of the permanent magnets is not changed, the magnetic field utilization rate of the permanent magnets is improved, and the purpose of improving the output power of the motor is achieved.

Description

Technical Field

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

[0002] The motor in the related technology includes a rotor assembly and a stator assembly. The rotor assembly is rotatable relative to the stator assembly. The stator assembly includes a magnet and a yoke. The magnet is installed on the yoke. However, due to the unreasonable assembly between the magnet and the yoke, the magnetic field utilization rate of the magnet is low and the magnetic flux lines are lost, which affects the output power of the motor. Utility Model Content

[0003] The purpose of the present application is to provide a motor that solves the problems of low magnetic field utilization, high magnetic flux loss and low power output of the motor.

[0004] In order to achieve the above-mentioned objectives, the first aspect embodiment of the present application provides a motor, including a rotor assembly and a stator assembly, wherein the stator assembly is sleeved in the rotor assembly, and the rotor assembly is rotatable relative to the stator assembly, and the stator assembly includes a yoke and a permanent magnet, and the inner surface of the yoke is provided with a mounting groove, and the permanent magnet is arranged in the mounting groove; wherein, in the depth direction of the mounting groove, the dimension H1 of the permanent magnet located inside the mounting groove is not greater than the dimension H2 of the permanent magnet located outside the mounting groove.

[0005] In some embodiments of the present application, the ratio of H1 to H2 is not less than 1 / 8 and not greater than 1 / 2.

[0006] In some embodiments of the present application, the magnetic yoke is provided with a plurality of the mounting grooves, and the plurality of the mounting grooves are arranged at intervals along the circumference of the motor; the number of the permanent magnets is multiple, and the plurality of the permanent magnets are installed in the plurality of the mounting grooves in a one-to-one correspondence.

[0007] In some embodiments of the present application, the yoke includes two first relative side walls arranged opposite to each other in a first radial direction, and the inner surface of each of the first relative side walls is provided with at least two mounting grooves; wherein, the first relative side walls include a middle portion, the middle portion is located between adjacent mounting grooves, and the inner surface of the middle portion is constructed as a plane or an arc surface protruding outward.

[0008] In some embodiments of the present application, in the radial direction of the motor, the distance between the inner surface of the middle portion and the bottom wall of the mounting groove is greater than 0.2 mm.

[0009] In some embodiments of the present application, a distance between adjacent mounting grooves of the same first relative side wall is not less than 1.5 mm and not greater than 3.5 mm.

[0010] In some embodiments of the present application, the permanent magnet has adjacent sides and opposite sides, the adjacent sides of adjacent permanent magnets of the same first opposite side wall are arranged oppositely, and the opposite sides of the two permanent magnets are arranged oppositely; wherein, in the depth direction of the mounting groove, the dimension of the adjacent side located outside the mounting groove is larger than the dimension of the opposite side located outside the mounting groove.

[0011] In some embodiments of the present application, the first relative side wall further includes an edge portion, the edge portion is located on a side of one of the mounting slots facing away from the other mounting slots, and the thickness of the middle portion is not less than the thickness of the edge portion.

[0012] In some embodiments of the present application, the yoke also includes two second relative side walls arranged opposite to each other in a second radial direction, the second radial direction is perpendicular to the first radial direction, and each of the second relative side walls is respectively connected to two of the first relative side walls; wherein the permanent magnet extends beyond the inner surface of the second relative side walls.

[0013] In some embodiments of the present application, the edge line of the inner circumferential surface of the first relative side wall and the central axis of the motor define a plane, and the distance between the plane and the bottom wall of the mounting groove is no more than 1 mm.

[0014] In some embodiments of the present application, the inner surface of the first relative side wall is configured as an arc-shaped surface protruding outward, and the inner surface of the second relative side wall is configured as a plane; in the circumferential direction of the motor, the arc length of the inner circumferential surface of the first relative side wall is smaller than the size of the second relative side wall.

[0015] In some embodiments of the present application, the maximum dimension of the rotor assembly in the radial direction of the motor is smaller than the minimum distance between the two first opposing side walls and is not larger than the maximum distance between the two second opposing side walls.

[0016] In some embodiments of the present application, the edge area of ​​the second opposing side walls does not extend inwardly beyond the central area of ​​the second opposing side walls.

[0017] In some embodiments of the present application, the second relative side wall includes a riveted portion, the riveted portion is spaced apart from the first relative side wall, and the thickness of the riveted portion is not less than 1 mm.

[0018] In some embodiments of the present application, the second relative side wall further includes: a transition portion, the transition portion is located between the riveted portion and the first relative side wall, and the thickness of the transition portion gradually decreases from the riveted portion toward the first relative side wall.

[0019] In some embodiments of the present application, the side surface of the permanent magnet facing away from the rotor assembly is a plane, and the width of the side surface of the permanent magnet facing away from the rotor assembly is not less than 3 mm and not more than 4.5 mm; or the side surface of the permanent magnet facing away from the rotor assembly is an outwardly convex arc surface, and the arc length of the side surface of the permanent magnet facing away from the rotor assembly is not less than 3 mm and not more than 4.5 mm.

[0020] In a second aspect embodiment of the present application, an electric toothbrush is proposed, comprising: a handle shell and a movement, wherein the movement comprises the motor according to the first aspect embodiment of the present application, and the movement is arranged in the handle shell.

[0021] In the motor of the embodiment of the present application, in the depth direction of the mounting groove, the magnetic lines of force of the permanent magnet located outside the mounting groove do not need to pass through the yoke or have a shorter distance through the yoke, and the magnetic lines of force of the permanent magnet located inside the mounting groove have a longer distance through the yoke. The magnetic lines of force of the permanent magnet located outside the mounting groove act on the rotor assembly more efficiently. Therefore, by increasing the proportion of the size of the permanent magnet located outside the mounting groove to the overall size of the permanent magnet, and reducing the proportion of the size of the permanent magnet located inside the mounting groove to the overall size of the permanent magnet, the loss of the magnetic lines of force of the permanent magnet is reduced without changing the volume and shape of the permanent magnet, and the utilization rate of the magnetic field of the permanent magnet is improved, so that the rotor assembly is subjected to a greater driving force, thereby achieving the purpose of increasing the output power of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of the structure of a motor according to an embodiment of the present application;

[0024] Figure 2 An exploded diagram of a motor according to an embodiment of the present application;

[0025] Figure 3 A cross-sectional view of a motor according to an embodiment of the present application;

[0026] Figure 4 A cross-sectional view of the motor from another perspective of an embodiment of the present application;

[0027] Figure 5 for Figure 4 A partial enlarged view of the middle A area;

[0028] Figure 6A cross-sectional view of a stator assembly of a motor according to an embodiment of the present application;

[0029] Figure 7 A cross-sectional view of a stator assembly and a rotating shaft of a motor according to an embodiment of the present application;

[0030] Figure 8 A schematic diagram of the structure of a stator assembly of a motor according to an embodiment of the present application;

[0031] Fig. 9 A schematic diagram of the structure of a rotor assembly of a motor according to an embodiment of the present application;

[0032] Fig.10 It is a schematic structural diagram of the rotor core of the rotor assembly of the motor according to an embodiment of the present application.

[0033] Description of Figure Numbers:

[0034] Motor 1,

[0035] The rotor assembly 100, the coil 110, the rotor core 120,

[0036] stator assembly 200, yoke 210, mounting slot 211, slot side wall 212, slot bottom wall 213, permanent magnet 220, adjacent side 221, opposite side 222, first opposite side wall 230, middle part 231, second opposite side wall 240, riveted part 241, transition part 242, stator case 250,

[0037] Rotating shaft 300.

[0038] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0039] In order to make the objectives, technical solutions and advantages of the present application clearer, the following part will further describe the embodiments of the present application in detail in conjunction with the accompanying drawings.

[0040] When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are only examples of devices and methods consistent with some aspects of the present application as detailed in the attached claims.

[0041] In the description of the present application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances. In addition, in the description of the present application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0043] The electric toothbrush of the embodiment of the present application comprises a brush head, a handle shell and a movement, wherein the movement comprises a motor 1 described below in the present application, and the movement is arranged in the handle shell. The handle shell is used to be held by the user, and the brush head is connected to the rotating shaft 300 of the motor 1, and the rotating shaft 300 drives the brush head to move to clean the user's oral cavity.

[0044] The motor 1 according to an embodiment of the present application is described below with reference to the accompanying drawings.

[0045] like Figure 1-Figure 3 As shown, the motor 1 of the embodiment of the present application includes a rotor assembly 100 and a stator assembly 200. The motor 1 can be applied to an electric toothbrush, and the motor 1 can be a sonic motor.

[0046] The stator assembly 200 is sleeved on the rotor assembly 100, and the rotor assembly 100 is rotatable relative to the stator assembly 200. The motor 1 also includes a rotating shaft 300, which is transmission-connected to the rotor assembly 100. When the rotor assembly 100 rotates relative to the stator assembly 200, the power of the rotor assembly 100 is output through the rotating shaft 300.

[0047] like Fig. 9 and Fig.10 As shown, the rotor assembly 100 may include a coil 110 and a rotor core 120. The rotor core 120 is drivingly connected to the rotating shaft 300. The rotating shaft 300 passes through the rotor core 120. The coil 110 is wound around the rotor core 120. When the coil 110 is energized, a magnetic field is generated.

[0048] The stator assembly 200 includes a yoke 210, a permanent magnet 220 and a stator housing 250. The yoke 210 is installed in the stator housing 250, and the stator housing 250 is used to protect the stator assembly 200 and the rotor assembly.

[0049] For example, the yoke 210 can be made of a soft magnetic material that does not generate a magnetic field (i.e., magnetic lines of force) itself and only plays a role in transmitting magnetic lines of force in the magnetic circuit. For example, the yoke 210 can be made of soft iron, A3 steel, or a soft magnetic alloy with relatively high magnetic permeability. The permanent magnet 220 refers to a magnet that can maintain its magnetism for a long time. The permanent magnet 220 can be made of artificial magnetic steel (iron-nickel-cobalt magnetic steel, etc.) or magnets. The permanent magnet 220 is used to generate a magnetic field. The magnetic field of the permanent magnet 220 interacts with the magnetic field of the coil 110 to drive the rotor assembly 100 to rotate relative to the stator assembly 200.

[0050] The inner surface of the yoke 210 is provided with a mounting groove 211, and the permanent magnet 220 is provided in the mounting groove 211. By providing the mounting groove 211 on the inner surface of the yoke 210 and installing the permanent magnet 220 in the mounting groove 211, the positioning between the permanent magnet 220 and the yoke 210 can be achieved, and the distance between the permanent magnet 220 and the rotor assembly 100 is relatively close, and the rotor assembly 100 is more significantly affected by the magnetic field of the permanent magnet 220, thereby ensuring the magnetic field utilization rate of the permanent magnet 220. In addition, the magnetic lines of force generated by the permanent magnet 220 can be transmitted through the yoke 210, avoiding magnetic leakage and improving the magnetic field utilization rate of the permanent magnet 220.

[0051] In addition, in the depth direction of the installation groove 211 , a dimension H1 of the permanent magnet 220 in the installation groove 211 is not greater than a dimension H2 of the permanent magnet 220 outside the installation groove 211 .

[0052] For example, the mounting groove 211 may extend along the axial direction of the motor 1 , and the mounting groove 211 may penetrate two opposite end surfaces of the yoke 210 in the axial direction of the motor 1 .

[0053] It should be noted that if Figure 4 and Figure 5 As shown, the inner sides of the two groove side walls 212 of the mounting groove 211 in the circumferential direction of the motor 1 are located on the first plane P1.

[0054] In the depth direction of the installation groove 211, the portion of the permanent magnet 220 located in the installation groove 211 refers to the portion of the permanent magnet 220 located on the first plane P1 facing away from the rotor assembly 100, and the dimension H1 of the permanent magnet 220 located in the installation groove 211 may be the maximum dimension of the portion of the permanent magnet 220 located in the installation groove 211;

[0055] In the depth direction of the mounting groove 211, the portion of the permanent magnet 220 located outside the mounting groove 211 refers to the portion of the permanent magnet 220 located on the first plane P1 facing the rotor assembly 100, and the dimension H1 of the permanent magnet 220 located in the mounting groove 211 may be the maximum dimension of the portion of the permanent magnet 220 located outside the mounting groove 211.

[0056] The magnetic lines of force of the permanent magnet 220 located outside the mounting slot 211 do not need to pass through the yoke 210 or have a shorter distance through the yoke 210, while the magnetic lines of force of the permanent magnet 220 located inside the mounting slot 211 have a longer distance through the yoke 210. The magnetic lines of force of the permanent magnet 220 located outside the mounting slot 211 act on the rotor assembly 100 more efficiently. Therefore, in the depth direction of the mounting slot 211, by increasing the proportion of the size of the permanent magnet 220 located outside the mounting slot 211 to the overall size of the permanent magnet 220, and reducing the proportion of the size of the permanent magnet 220 located inside the mounting slot 211 to the overall size of the permanent magnet 220, the loss of the magnetic lines of force of the permanent magnet 220 can be reduced without changing the volume and shape of the permanent magnet 220, thereby improving the utilization rate of the magnetic field of the permanent magnet 220, and thereby increasing the driving force applied to the rotor assembly 100, thereby achieving the purpose of increasing the output power of the motor 1.

[0057] In this way, the motor 1 according to the embodiment of the present application increases the size of the permanent magnet 220 outside the installation groove 211 and reduces the size of the permanent magnet 220 inside the installation groove 211. While ensuring that the size of the permanent magnet 220 remains unchanged, the loss of magnetic flux lines of the permanent magnet 220 is reduced, and the magnetic field utilization rate of the permanent magnet 220 is improved. As a result, the rotor assembly 100 is subjected to a greater driving force, thereby achieving the purpose of increasing the output power of the motor 1.

[0058] According to the electric toothbrush of the embodiment of the present application, the motor 1 is connected to the brush head of the electric toothbrush, and the power of the motor 1 is transmitted through the brush head, so that the cleaning efficiency of the brush head is higher.

[0059] The ratio of H1 to H2 is not less than 1 / 8 and not greater than 1 / 2. For example, the ratio of H1 to H2 may be 1 / 8, 1 / 7, 1 / 6, 1 / 5, 1 / 4, 1 / 3 or 1 / 2.

[0060] When the ratio of H1 to H2 is less than 1 / 8, in the depth direction of the mounting groove 211, the ratio of the size of the permanent magnet 220 located inside the mounting groove 211 to the overall size of the permanent magnet 220 is small, and the ratio of the size of the permanent magnet 220 located outside the mounting groove 211 to the overall size of the permanent magnet 220 is large, and the position stability of the permanent magnet 220 is poor. When the motor 1 vibrates, the permanent magnet 220 is easy to detach from the mounting groove 211, and the magnetic field utilization rate of the permanent magnet 220 is also reduced;

[0061] When the ratio of H1 to H2 is greater than 1 / 2, in the depth direction of the mounting groove 211, the ratio of the size of the permanent magnet 220 located inside the mounting groove 211 to the overall size of the permanent magnet 220 is larger, and the ratio of the size of the permanent magnet 220 located outside the mounting groove 211 to the overall size of the permanent magnet 220 is smaller, and the magnetic field utilization rate of the permanent magnet 220 is low.

[0062] When the ratio of H1 to H2 is greater than or equal to 1 / 8 and less than or equal to 1 / 2, both the installation stability of the permanent magnet 220 and the magnetic field utilization rate of the permanent magnet 220 can be ensured.

[0063] like Figure 4 As shown, the yoke 210 is provided with a plurality of mounting grooves 211, and the plurality of mounting grooves 211 are arranged at intervals along the circumference of the motor 1. There are a plurality of permanent magnets 220, and the plurality of permanent magnets 220 are mounted in the plurality of mounting grooves 211 in a one-to-one correspondence. In this way, the permanent magnets 220 are evenly distributed in the circumference of the motor 1, and the uniformity of the magnetic field can be ensured, so that the motor 1 can ensure sufficient power within the rotation stroke of the rotor assembly 100.

[0064] like Figure 4 and Figure 6 As shown, the yoke 210 includes two first opposite side walls 230 arranged opposite to each other in a first radial direction (the direction indicated by arrow A in the figure), and the inner surface of each first opposite side wall 230 is provided with at least two mounting grooves 211. The first opposite side wall 230 includes a middle portion 231, and the middle portion 231 is located between adjacent mounting grooves 211 in the circumferential direction of the motor 1, and the inner surface of the middle portion 231 is configured as a plane or an arc surface convex outward.

[0065] That is, the inner sides of the adjacent groove side walls 212 of two adjacent installation grooves 211 are located in the second plane P2, the inner surface of the middle portion 231 is located in the second plane P2, or the inner surface of the middle portion 231 protrudes away from the rotor assembly 100 relative to the second plane P2.

[0066] When the inner surface of the middle portion 231 protrudes toward the direction close to the rotor assembly 100 relative to the second plane P2, the portion of the middle portion 231 closer to the rotor assembly 100 relative to the second plane P2 will have a greater impact on the direction of the magnetic flux lines of the permanent magnet 220, and the magnetic flux lines of the permanent magnet 220 will be lost a lot, affecting the magnetic field distribution of the permanent magnet 220, and the output power of the motor 1 is limited.

[0067] When the inner surface of the middle portion 231 protrudes away from the rotor assembly 100 relative to the second plane P2, or when the inner surface of the middle portion 231 is located in the second plane P2, the magnetic flux loss of the permanent magnet 220 is small, and the magnetic field distribution of the permanent magnet 220 is more reasonable, which is beneficial to improving the utilization rate of the permanent magnet 220 and the output power of the motor 1 is higher.

[0068] like Figure 6 As shown, in the radial direction of the motor 1, the distance L1 between the inner surface of the middle portion 231 and the bottom wall 213 of the mounting groove 211 is greater than 0.2 mm. For example, L1 can be 0.2 mm, 0.2 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.29 mm, 0.29 mm or 0.3 mm.

[0069] It should be noted that, in the circumferential direction of the motor 1, the inner surface of the middle portion 231 and the groove bottom wall 213 of the mounting groove 211 may be arranged in a staggered manner, that is, from the outside to the inside along the radial direction of the motor 1, the distance between the two groove side walls 212 of the mounting groove 211 in the circumferential direction of the motor 1 may gradually increase. Alternatively, the inner surface of the middle portion 231 and the groove bottom wall 213 of the mounting groove 211 are arranged in a non-staggered manner, and from the outside to the inside along the radial direction of the motor 1, the distance between the two groove side walls 212 of the mounting groove 211 in the circumferential direction of the motor 1 may remain unchanged.

[0070] In this way, the side of the mounting groove 211 close to the middle part 231 has sufficient depth, which can ensure the stability of the position of the permanent magnet 220 in the mounting groove 211, prevent the permanent magnet 220 from detaching from the mounting groove 211 due to vibration of the motor 1, and ensure the service life and reliability of the motor 1.

[0071] like Figure 6 As shown, the spacing L2 between adjacent mounting grooves 211 of the same first opposing side wall 230 is not less than 1.5 mm and not more than 3.5 mm. For example, the spacing between adjacent mounting grooves 211 of the same first opposing side wall 230 can be 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm or 3.5 mm.

[0072] It should be noted that the distance L2 between adjacent mounting grooves 211 of the same first opposing side wall 230 refers to the distance between groove bottom walls 213 of adjacent mounting grooves 211 of the same first opposing side wall 230 .

[0073] Since the size of the first relative side wall 230 in the circumferential direction of the motor 1 is limited, when the spacing between adjacent mounting slots 211 of the same first relative side wall 230 is greater than 3.5 mm, if the number of permanent magnets 220 that need to be arranged on the first relative side wall 230 is determined, it will inevitably lead to a reduction in the size of a single permanent magnet 220 in the circumferential direction of the motor 1, affecting the magnetic field strength of the permanent magnet 220, thereby making it impossible to ensure that the motor 1 provides sufficient power.

[0074] When the spacing between adjacent mounting grooves 211 of the same first relative side wall 230 is less than 1.5 mm, the magnetic fields between adjacent permanent magnets 220 overlap with each other to a large extent. For example, the magnetic fields between adjacent permanent magnets 220 may largely offset each other in some areas. When the rotor assembly 100 swings to the extreme position, the power output of the motor 1 will be reduced, affecting the stability of the power output of the motor 1.

[0075] When the spacing between adjacent mounting grooves 211 of the same first relative side wall 230 is greater than or equal to 1.5 mm and less than or equal to 3.5 mm, it can ensure that the permanent magnet 220 has sufficient size in the circumferential direction of the motor 1 and the permanent magnet 220 can provide sufficient magnetic field strength, while avoiding excessive interference between the magnetic fields of adjacent permanent magnets 220, so that the motor 1 has sufficient power in the entire rotating area of ​​the rotor core 120 and the power output of the motor 1 is stable.

[0076] Of course, it can be understood that in some embodiments, the spacing between adjacent mounting grooves 211 of the same first relative side wall 230 refers to the minimum distance between adjacent mounting grooves 211 of the same first relative side wall 230, which can be the spacing between the groove bottom walls 213 of adjacent mounting grooves 211 of the same first relative side wall 230, or the spacing between the groove side walls 212 of adjacent mounting grooves 211 of the same first relative side wall 230.

[0077] like Figure 4 As shown, the permanent magnet 220 has an adjacent side 221 and an opposite side 222. The adjacent sides 221 of the adjacent permanent magnets 220 of the same first opposite side wall 230 are arranged opposite to each other, and the opposite sides 222 of the two permanent magnets 220 are arranged opposite to each other. In the depth direction of the mounting groove 211, the dimension of the adjacent side 221 outside the mounting groove 211 is greater than the dimension of the opposite side 222 outside the mounting groove 211.

[0078] The influence of the adjacent side 221 on the magnetic field of the permanent magnet 220 is greater than that of the opposite side 222 on the magnetic field of the permanent magnet 220. Therefore, on the one hand, by making the adjacent side 221 of the permanent magnet 220 exposed with a larger area, the direction of the magnetic field magnetic circuit of the permanent magnet 220 is optimized, and the magnetic field utilization rate of the permanent magnet 220 is effectively improved, thereby improving the output power of the motor 1. On the other hand, the opposite side 222 of the permanent magnet 220 is located in the installation groove 211. The size is larger, which improves the installation stability.

[0079] The first relative side wall 230 further includes an edge portion, which is located on the side of one mounting slot 211 facing away from the other mounting slots 211, and the thickness of the middle portion 231 is not less than the thickness of the edge portion. The influence of the middle portion 231 on the magnetic circuit of the permanent magnet 220 is greater than the influence of the edge portion on the magnetic circuit of the permanent magnet 220. By reducing the thickness of the middle portion 231, the magnetic circuit direction of the permanent magnet 220 can be optimized, and the magnetic field utilization rate of the permanent magnet 220 can be improved, thereby improving the power output by the motor 1.

[0080] like Figure 4 As shown, the yoke 210 further includes two second opposite side walls 240 arranged opposite to each other in a second radial direction (the direction indicated by arrow B in the figure), the second radial direction is perpendicular to the first radial direction, and each second opposite side wall 240 is respectively connected to the two first opposite side walls 230. The permanent magnet 220 exceeds the inner surface of the second opposite side wall 240.

[0081] Since the second relative side wall 240 will also affect the magnetic circuit of the permanent magnet 220, by having the permanent magnet 220 extend beyond the inner surface of the second relative side wall 240, the influence of the second relative side wall 240 on the magnetic circuit of the permanent magnet 220 can be reduced, the direction of the magnetic circuit of the permanent magnet 220 can be optimized, and the utilization rate of the magnetic field of the permanent magnet 220 can be improved, thereby increasing the power output by the motor 1.

[0082] like Figure 7 As shown, the edge line of the inner circumference of the first opposing side wall 230 and the central axis of the motor 1 define a plane C, and the distance L3 between the plane and the bottom wall of the mounting groove 211 is not greater than 1 mm. For example, the distance between the plane C and the bottom wall 213 of the mounting groove 211 can be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm.

[0083] It should be noted that the edge line of the inner circumference of the first opposing side wall 230 refers to the boundary line between the inner circumference of the first opposing side wall 230 and the inner circumference of the second opposing side wall 240. The inner circumference of the first opposing side wall 230 and the inner circumference of the second opposing side wall 240 may form a corner at the boundary line. In addition, the central axis of the motor 1 refers to the central axis of the rotating shaft 300.

[0084] In addition, the bottom wall of the mounting groove 211 may directly extend to the edge line of the inner circumference of the first opposing side wall 230. The groove side wall of the mounting groove 211 may extend to the edge line of the inner circumference of the first opposing side wall 230, or the groove side wall of the mounting groove 211 may extend to the second opposing side wall 240.

[0085] In this way, in the circumferential direction of the motor 1 , the size of the mounting slot 211 can be increased, and the size of the permanent magnet 220 can be increased accordingly, thereby increasing the magnetic field range of the permanent magnet 220 and improving the output power of the motor 1 .

[0086] like Figure 4 , Figure 6-Figure 8 As shown, the inner surface of the first opposing side wall 230 is configured as an arc-shaped surface convex outward, and the inner surface of the second opposing side wall 240 is configured as a plane. In the circumferential direction of the motor 1, the arc length of the inner circumference of the first opposing side wall 230 is smaller than the size of the second opposing side wall 240.

[0087] For example, the outer surface of the first opposing side wall 230 can also be configured as an arc-shaped surface convex outward, and the outer surface of the first opposing side wall 230 and the inner surface of the first opposing side wall 230 can be arranged in parallel. The outer surface of the second opposing side wall 240 is configured as a plane, and the outer surface of the second opposing side wall 240 and the inner surface of the second opposing side wall 240 can be arranged in parallel.

[0088] Thus, the inner surface of the yoke 210 is configured as an oblong shape, and the outer surface of the yoke 210 can also be configured as an oblong shape. The rotor assembly 100 can rotate between the two first opposite side walls 230, thereby reducing the volume of the motor 1, which is conducive to the miniaturization of the motor 1. The motor 1 is more suitable for use in an electric toothbrush, does not excessively occupy the internal space of the electric toothbrush, and the arrangement of the electric toothbrush is more convenient.

[0089] like Figure 4 As shown, the maximum dimension of the rotor assembly 100 in the radial direction of the motor 1 is smaller than the minimum distance between the two first opposite side walls 230 , and is not larger than the maximum distance between the two second opposite side walls 240 .

[0090] That is, the rotor assembly 100 rotates between the two first opposite side walls 230, and the second opposite side wall 240 can limit the maximum rotation stroke of the rotor assembly 100, preventing the rotor assembly 100 from rotating excessively, and effectively avoiding wear and disconnection of the coil 110 due to pulling.

[0091] like Figure 4 , Figure 6-Figure 8 As shown, the edge area of ​​the second opposing side wall 240 does not extend inwardly beyond the central area of ​​the second opposing side wall 240 .

[0092] In this way, the edge area of ​​the second relative side in the circumferential direction of the motor 1 will not protrude inward relative to the central area of ​​the second relative side in the circumferential direction of the motor 1, thereby avoiding the influence of the edge area of ​​the second relative side wall 240 on the magnetic circuit of the permanent magnet 220, improving the magnetic field utilization rate of the permanent magnet 220, and at the same time, it can increase the size of the permanent magnet 220 in the motor 1, increase the magnetic field range and magnetic field strength of the permanent magnet 220, and realize the improvement of the output power of the motor 1.

[0093] like Figure 4 and Figure 6 As shown, the second opposite side wall 240 includes a riveted portion 241, which is spaced apart from the first opposite side wall 230, and has a thickness of not less than 1 mm. For example, the thickness of the riveted portion 241 may be 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm or 2 mm.

[0094] The yoke 210 may include a plurality of magnetic sheets, which may be silicon steel sheets, and the plurality of magnetic sheets are stacked along the circumference of the motor 1, and the plurality of magnetic sheets are fixed by riveting and positioning at the riveted portion 241. If the thickness of the riveted portion 241 is set to be less than 1 mm, the structural strength of the riveted portion 241 is low, and not only is the riveting difficulty high during the riveting process, and the yoke 210 is easily damaged, but also the riveted portion 241 is easily damaged during the use of the motor 1 after riveting, for example, the vibration of the motor 1 causes the riveted portion 241 to be damaged by force.

[0095] By setting the thickness of the riveted portion 241 to be greater than or equal to 1 mm, the structural strength of the riveted portion 241 can be improved, thereby improving the force-bearing capacity of the riveted portion 241 and reducing the probability of damage to the riveted portion 241. The yoke 210 is less likely to fall apart, and it is more convenient to rivet the yoke 210.

[0096] like Figure 4 and Figure 6 As shown, the second relative side wall 240 further includes a transition portion 242 , which is located between the riveted portion 241 and the first relative side wall 230 , and the thickness of the transition portion 242 gradually decreases from the riveted portion 241 toward the first relative side wall 230 .

[0097] In this way, the influence of the transition portion 242 on the magnetic field of the permanent magnet 220 can be reduced, the magnetic circuit of the permanent magnet 220 can be optimized, the utilization rate of the magnetic field of the permanent magnet 220 can be improved, and the output power of the motor 1 can be increased.

[0098] like Figure 4 , Figure 6 and Figure 8As shown, the side of the permanent magnet 220 facing away from the rotor assembly 100 is a plane, and the size of the side of the permanent magnet 220 facing away from the rotor assembly 100 in the circumferential direction of the motor 1 is not less than 3 mm and not more than 4.5 mm. For example, the width of the side of the permanent magnet 220 facing away from the rotor assembly 100 can be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm or 4.5 mm.

[0099] Alternatively, the side of the permanent magnet 220 facing away from the rotor assembly 100 is an outwardly convex arc surface, and the arc length of the side of the permanent magnet 220 facing away from the rotor assembly 100 in the circumferential direction of the motor 1 is not less than 3 mm and not more than 4.5 mm. For example, the arc length of the side of the permanent magnet 220 facing away from the rotor assembly 100 can be 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm or 4.5 mm.

[0100] In the circumferential direction of the motor 1, when the size of the side surface of the permanent magnet 220 facing away from the rotor assembly 100 is less than 3 mm, the volume of the permanent magnet 220 is small, and the magnetic field generated by the permanent magnet 220 has a small coverage range, resulting in the motor 1 being unable to always maintain sufficient output power within the rotation stroke of the rotor core 120, and the output power of the motor 1 fluctuates greatly.

[0101] In the circumferential direction of the motor 1, when the size of the side surface of the permanent magnet 220 facing away from the rotor assembly 100 is greater than 4.5 mm, the volume of the permanent magnet 220 is relatively large, and the magnetic fields generated by adjacent permanent magnets 220 interfere with each other to a large extent, which in turn affects the magnetic field strength, resulting in insufficient output power of the motor 1.

[0102] In the circumferential direction of the motor 1, when the size of the side surface of the permanent magnet 220 facing away from the rotor assembly 100 is greater than or equal to 3 mm and less than or equal to 4.5 mm, the magnetic field of the permanent magnet 220 can cover the entire rotation stroke of the rotor assembly 100 and avoid excessive interference between adjacent permanent magnets 220, and the output power of the motor 1 is stable and sufficient.

[0103] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, it is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limitations on this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0104] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A motor, characterized in that: include: Rotor assembly; A stator assembly, wherein the stator assembly is sleeved on the rotor assembly, the rotor assembly is rotatable relative to the stator assembly, the stator assembly comprises a yoke and a permanent magnet, an inner surface of the yoke is provided with a mounting groove, and the permanent magnet is arranged in the mounting groove; Wherein, in the depth direction of the installation groove, a dimension H1 of the permanent magnet inside the installation groove is not greater than a dimension H2 of the permanent magnet outside the installation groove.

2. The motor according to claim 1, characterized in that The ratio of H1 to H2 is not less than 1 / 8 and not more than 1 / 2.

3. The motor according to claim 1, characterized in that The magnetic yoke is provided with a plurality of the mounting grooves, and the plurality of the mounting grooves are arranged at intervals along the circumference of the motor; There are multiple permanent magnets, and the multiple permanent magnets are installed in the multiple installation slots in a one-to-one correspondence.

4. The motor according to claim 1, characterized in that The yoke comprises two first opposite side walls arranged opposite to each other in a first radial direction, and the inner surface of each of the first opposite side walls is provided with at least two mounting grooves; Wherein, the first relative side walls include a middle portion, the middle portion is located between adjacent mounting grooves, and the inner surface of the middle portion is configured as a plane or an arc surface convex outward.

5. The motor according to claim 4, characterized in that In the radial direction of the motor, the distance between the inner surface of the middle portion and the bottom wall of the mounting groove is greater than 0.2 mm.

6. The motor according to claim 4, characterized in that The spacing between adjacent mounting grooves of the same first opposing side wall is not less than 1.5 mm and not more than 3.5 mm.

7. The motor according to claim 4, characterized in that The permanent magnets have adjacent sides and opposite sides, the adjacent sides of the adjacent permanent magnets of the same first opposite side wall are arranged opposite to each other, and the opposite sides of the two permanent magnets are arranged opposite to each other; Wherein, in the depth direction of the installation groove, the dimension of the adjacent side outside the installation groove is greater than the dimension of the opposite side outside the installation groove.

8. The motor according to claim 4, characterized in that The first opposite side walls further include an edge portion, the edge portion is located on a side of one of the mounting slots facing away from the other mounting slots, and the thickness of the middle portion is not less than the thickness of the edge portion.

9. The motor according to claim 4, characterized in that The magnetic yoke further includes two second opposite side walls arranged opposite to each other in a second radial direction, the second radial direction is perpendicular to the first radial direction, and each of the second opposite side walls is respectively connected to two of the first opposite side walls; Wherein, the permanent magnet exceeds the inner surface of the second opposite side wall.

10. The motor according to claim 9, characterized in that The edge line of the inner circumferential surface of the first opposite side wall and the central axis of the motor define a plane, and the distance between the plane and the bottom wall of the mounting groove is no more than 1 mm.

11. The motor according to claim 9, characterized in that The inner surface of the first opposite side wall is configured as an arc-shaped surface convex outward, and the inner surface of the second opposite side wall is configured as a plane; In the circumferential direction of the motor, the arc length of the inner circumferential surface of the first opposing side walls is smaller than the size of the second opposing side walls.

12. The motor according to claim 9, characterized in that The maximum dimension of the rotor assembly in the radial direction of the motor is smaller than the minimum distance between the two first opposing side walls and is not larger than the maximum distance between the two second opposing side walls.

13. The motor according to claim 9, characterized in that The edge regions of the second opposing side walls do not extend inwardly beyond the central region of the second opposing side walls.

14. The motor according to claim 9, characterized in that The second opposite side wall includes a riveted portion, the riveted portion is spaced apart from the first opposite side wall, and the thickness of the riveted portion is not less than 1 mm.

15. The motor according to claim 14, characterized in that The second opposing side wall further comprises: A transition portion is located between the riveted portion and the first opposite side wall, and a thickness of the transition portion gradually decreases from the riveted portion toward the first opposite side wall.

16. The electric machine according to any one of claims 1 to 15, characterized in that: The side surface of the permanent magnet facing away from the rotor assembly is a plane, and the width of the side surface of the permanent magnet facing away from the rotor assembly is not less than 3 mm and not more than 4.5 mm; or The side surface of the permanent magnet facing away from the rotor assembly is an outwardly convex arc surface, and the arc length of the side surface of the permanent magnet facing away from the rotor assembly is not less than 3 mm and not more than 4.5 mm.

17. An electric toothbrush, characterized in that: include: Handle shell; A movement, the movement comprising a motor according to any one of claims 1-16, and the movement is arranged in the handle shell.

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