electric machine

Abstract

The present application provides a motor, which comprises a rotor and a stator, two sides of the rotor respectively have an outer surface, the stator comprises a stator core, the inner side of the stator core is symmetrically provided with at least two winding teeth, two the winding teeth have symmetric two inner surfaces, and the outer surface of the rotor is opposite to the inner surface, wherein the inner surface is a cambered surface, each winding tooth generates symmetric suction force to the two sides of the rotor respectively, so that the two sides of the rotor are respectively centered relative to the winding teeth.

Description

Technical Field

[0001] This invention relates to the field of electric motor technology, and more particularly to an electric motor. Background Technology

[0002] Electric motors have wide applications in the electrical appliance industry. With the improvement of living standards, small appliances such as electric toothbrushes and electric beauty devices are increasingly favored by consumers. The working parts of these small appliances need to generate reciprocating motion under the drive of a motor to perform cleaning, massage, and other functions. The angle, distance, frequency, and stability of the reciprocating motion of the working parts affect the working effect. The performance of the motor plays a decisive role in the working effect of the working parts. In a typical motor, the coil is directly wound around the stator core, and the rotor passes through the space in the middle of the stator core. The space in the stator core that houses the rotor is relatively large, and there is a significant gap between the rotor and the stator. When the rotor moves relative to the stator, it will deflect, causing the rotor shaft to deflect, affecting the working effect of the working parts.

[0003] Reference Figure 1 The diagram shows a schematic of a stator core 10P of an existing electric motor. The stator core 10P includes a winding portion 11P and two side portions 12P, which are integrally formed. An opening 100P is formed between the two side portions 12P. The winding portion 11P and the two side portions 12P surround each other to form a hollow receiving space. The stator core 10P is U-shaped. Each side portion 12P has an inner surface 121P, which is planar. Enamelled wire is wound onto the winding portion 11P. The rotor passes through the receiving space of the stator core 10P. The stator core 10P is wound on one side only. The stator core 10P generates a unilateral electromagnetic field on the rotor, which can easily cause rotor deflection. Rotor deflection changes the air gap between the stator and rotor, affecting the motor's output and thus the electrical performance. Furthermore, since the inner surface 121P of the side portion 12P is planar, the air gap between the side portion 12P and the rotor is not uniform, affecting the rotor's output performance. The suction force generated by the inner side of the side portion 12P on both sides of the rotor is uneven and cannot be effectively centered. During movement, energy is required to center the rotor, which also affects the rotor's output performance.

[0004] In addition, the rotor has a complex structure and many processes. It requires the integration of components such as the shaft and magnetic plate through plastic parts or injection molding, which makes it impossible to effectively automate the rotor and results in low production efficiency. Summary of the Invention

[0005] One advantage of the present invention is that it provides an electric motor in which the two sides of the rotor are effectively centered, reducing the energy consumption for rotational position correction.

[0006] Another advantage of the present invention is that it provides an electric motor in which the stator has a small housing space, limiting the movement space of the rotor within the stator and preventing the rotor from deviating from its motion trajectory.

[0007] Another advantage of the present invention is that it provides an electric motor in which the stator includes a stator core, the inner side of which is provided with at least two winding teeth for winding, so that the coils are relatively distributed and generate attraction on both sides of the rotor, thereby balancing the rotational position of the rotor and keeping it centered.

[0008] Another advantage of the present invention is that it provides an electric motor in which the stator core is provided with an opening so that the heat generated inside the stator core can be directly transferred to a housing of the electric motor, thereby enhancing the heat dissipation effect.

[0009] Another advantage of the present invention is that it provides an electric motor in which the air gap between the inner surface of the winding teeth of the stator core and the outer surface of the magnet of the rotor is uniformly distributed, so that the air gap can be made smaller during processing, thereby enhancing the output effect of the rotor.

[0010] Another advantage of the present invention is that it provides a motor in which the rotor does not contain plastic parts, eliminating the injection molding process and facilitating automated processing.

[0011] Another advantage of the present invention is that it provides a motor, which further includes at least one elastic element, which, when the drive shaft deviates, causes the rotor to rotate back to the center state through an elastic restoring force, thereby achieving an automatic correction effect.

[0012] Another advantage of the present invention is that it provides a motor in which the elastic element is mounted at the end of the motor and connected to the drive shaft to generate a resonance point.

[0013] Other advantages and features of the invention will be fully apparent from the following detailed description and may be achieved by combinations of the means and apparatus specifically pointed out in the appended claims.

[0014] According to one aspect of the present invention, an electric motor of the present invention, capable of achieving the foregoing and other objects and advantages, comprises:

[0015] A rotor, wherein each side of the rotor has an outer surface;

[0016] A stator, the stator including a stator core, the inner side of the stator core being symmetrically provided with at least two winding teeth, the two winding teeth having two symmetrical inner surfaces opposite to the outer surface of the rotor, wherein the inner surface is an arc surface, and each winding tooth generates a symmetrical suction force on both sides of the rotor, so that the two sides of the rotor are respectively centered relative to the winding teeth.

[0017] According to one embodiment of the present invention, the stator core includes at least one outer peripheral wall, at least two protrusions and two locking portions. Each of the protrusions extends from the inner side of the outer peripheral wall toward the center of the stator core in a raised manner. Each of the locking portions extends from the end of the protrusion near the center of the stator core in a curved manner toward both sides to form the winding teeth arranged opposite to each other.

[0018] According to one embodiment of the present invention, the outer peripheral wall is U-shaped.

[0019] According to one embodiment of the present invention, the stator core is a split core, the stator core includes a first stator core and a second stator core, the first stator core and the second stator core are symmetrically arranged, the first stator core and the second stator core respectively have arc-shaped outer peripheral walls, and the protrusion and the locking portion are symmetrically formed on the inner side of the outer peripheral wall.

[0020] According to one embodiment of the present invention, the stator further includes a first wire frame and a second wire frame, which are assembled with both ends of the stator core.

[0021] According to one embodiment of the present invention, the stator further includes at least one insert installed inside the stator core, located on one side of the rotor, wherein the insert restricts the rotation angle of the rotor so that the drive shaft vibrates within a certain range.

[0022] According to one embodiment of the present invention, the insert includes a body, at least one fastener, at least two resistors, and at least one limiting body. The fastener and each of the resistors extend outwardly from two surfaces opposite to the body. The limiting body is formed between the resistors, wherein each of the resistors is located on one side of the locking portion, and the limiting body is located on one side of the rotor, thereby limiting the rotation angle of the rotor.

[0023] According to one embodiment of the present invention, the rotor includes a rotor core, a drive shaft and at least two magnets, the drive shaft passes through the rotor core, the rotor core has at least two mounting slots arranged back to back, and each of the magnets is respectively mounted in the mounting slot.

[0024] According to one embodiment of the present invention, an outer surface of the magnet facing the inner surface of the stator core is an arc surface, and the air gap between the outer surface of the magnet and the inner surface of the stator core is uniformly distributed.

[0025] According to one embodiment of the present invention, an outer surface of the magnet facing the inner surface of the stator core is a plane.

[0026] According to one embodiment of the present invention, the rotor core includes a fixing portion and at least two mounting portions, each mounting portion extending outward from both sides of the fixing portion, wherein each mounting portion includes at least two first sidewalls and at least two second sidewalls symmetrically arranged, an included angle being formed between the first sidewalls and the second sidewalls, and the second sidewalls restricting the magnet from the mounting groove to move laterally toward the rotor core.

[0027] According to one embodiment of the present invention, the motor further includes a housing and a cover, the housing being mounted on the outside of the stator, and the cover being placed over one end of the housing to close the stator.

[0028] According to one embodiment of the present invention, the motor further includes at least one elastic element mounted to the rotor to resonate with the movement of the rotor, wherein the elastic element deforms when the rotor moves to provide a restoring force for the two sides of the rotor to return to a centered state.

[0029] According to one embodiment of the present invention, the elastic element is connected to the cover and the drive shaft respectively, and the extension direction of the elastic element is the same as the extension direction of the cover.

[0030] According to one embodiment of the present invention, the elastic element is connected to the cover and the drive shaft respectively, and the extension direction of the elastic element is the same as the extension direction of the drive shaft.

[0031] According to one embodiment of the present invention, at least two bearings are connected between the housing and the drive shaft. The bearings are respectively disposed at both ends of the housing and connected to the drive shaft to support the movement of the drive shaft.

[0032] The further objects and advantages of the invention will become fully apparent from the following description and accompanying drawings.

[0033] These and other objects, features and advantages of the present invention will be fully realized through the following detailed description, drawings and claims. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of a stator core of an electric motor based on existing technology.

[0035] Figure 2A and Figure 2B This is a schematic diagram of a stator core of an electric motor according to a preferred embodiment of the present invention.

[0036] Figure 3A and Figure 3B This is a schematic diagram of a stator core of an electric motor according to a preferred embodiment of the present invention.

[0037] Figure 4 This is a three-dimensional schematic diagram of an electric motor according to a preferred embodiment of the present invention.

[0038] Figure 5 This is an exploded schematic diagram of an electric motor according to a preferred embodiment of the present invention.

[0039] Figure 6 This is a cross-sectional schematic diagram of an electric motor according to a preferred embodiment of the present invention.

[0040] Figure 7A and Figure 7B This is a schematic diagram of a stator of an electric motor according to a preferred embodiment of the present invention.

[0041] Figure 8A and Figure 8B This is a schematic diagram of a stator of an electric motor according to a preferred embodiment of the present invention.

[0042] Figure 9A and Figure 9B This is a schematic diagram of a rotor of an electric motor according to a preferred embodiment of the present invention.

[0043] Figure 10A and Figure 10B This is a schematic diagram of a rotor of an electric motor according to a preferred embodiment of the present invention. Detailed Implementation

[0044] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0045] Those skilled in the art should understand that, in the disclosure of this invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the invention.

[0046] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0047] Refer to the accompanying drawings of this invention. Figures 2A to 10B An electric motor and its stator core according to a preferred embodiment of the present invention are disclosed and described below.

[0048] Figure 2A and Figure 2B A stator core 11 modified from an existing stator core is shown. The stator core 11 has an outer peripheral wall 111, which is U-shaped. The outer peripheral wall 111 has an opening 1110. The stator core 11 also includes at least two protrusions 112 and at least two locking portions 113. Each of the protrusions 112 extends a certain distance from the opposite inner side of the outer peripheral wall 111 towards the center. The protrusions 112 are distributed along a direction parallel to the outer peripheral wall 111 and the central axis. Each of the protrusions 112 is symmetrically distributed on the inner side of the outer peripheral wall 111. Each of the protrusions 112 is distributed on both sides of the opening 1110.

[0049] The locking portion 113 extends from the end of the protrusion 112 near the center side in a curved manner to both sides. A space for winding is formed between the locking portion 113 and the inner side of the outer peripheral wall 111, and both ends of the locking portion 113 extend curvedly towards the center of the stator core 11. The surface of the locking portion 113 facing the center side is an arc surface with a certain curvature. In other words, the locking portion 113 has an inner surface 1131, which is an arc surface. The inner surfaces 1131 of each locking portion 113 are arranged opposite to each other, forming a receiving space between the inner surfaces 1131 for accommodating the rotor.

[0050] In other words, at least one set of winding teeth is provided on the inner side of the outer peripheral wall 111 of the stator core 11. By adding winding teeth inside the stator core 11, the housing space of the stator core 11 is reduced, limiting the range of motion of the rotor and helping to keep the rotor centered. Furthermore, setting the surface of the winding teeth to an arc surface ensures a uniform air gap between the stator and rotor, enhancing the rotor's output power. The opposing arrangement of the winding teeth generates a relative suction force on the rotor, keeping it centered and automatically correcting its rotational position.

[0051] Figure 3A and Figure 3BA modified stator core 11A is provided for the aforementioned stator core 11. The structure of the winding teeth portion is the same, and the parts with the same reference numerals will not be described again. The difference is that the stator core 11A is a split structure, comprising a first stator core 1101A and a second stator core 1102A, each having an arc-shaped outer peripheral wall 111A. The first stator core 1101A and the second stator core 1102A are symmetrically assembled to the stator and the motor. The first stator core 1101A and the second stator core 1102A are respectively formed with the protrusion 112 and the locking portion 113, and an arc-shaped inner surface 1131. After being assembled to the motor, two openings 1110 are formed between the first stator core 1101A and the second stator core 1102A.

[0052] like Figures 4 to 6 The motor shown includes a stator 10 and a rotor 20, with the stator 10 fitted over the rotor 20. The rotor 20 is inserted inside the stator 10. The rotor 20 moves at the center of the stator 10. Preferably, the central axis of the rotor 20 coincides with the central axis of the stator 10. When the stator 10 is energized, it generates a magnetic field, which drives the rotor 20 to vibrate under magnetic force. Further, the stator 10 drives the rotor 20 to oscillate. The rotor 20 reciprocates by a certain angle.

[0053] The motor further includes a housing 30 and at least one cover 40. The housing 30 is installed outside the stator 10 to enclose the stator 10. The cover 40 is placed over one end of the housing 30, and together with the housing 30, seals the stator 10. The central axes of the stator 10, the rotor 20, and the housing 30 coincide, facilitating assembly.

[0054] The stator 10 includes a stator core 11, a first wire frame 12, and a second wire frame 13, which are respectively mounted at both ends of the stator core 11. The first wire frame 12 and the second wire frame 13 are made of insulating material. The stator core 11 can be formed by stacking and stamping multiple layers of silicon steel sheets along a direction parallel to its central axis.

[0055] Reference Figures 2A to 4 The rotor 20 is inserted between the winding teeth, which are evenly and symmetrically distributed on the outer periphery of the rotor 20.

[0056] The locking part 113 and the protrusion 112 further define the receiving space formed by the outer peripheral wall 111, restricting the movement space of the rotor 20 in the stator 10, and also restricting the space when the rotor 20 is assembled into the stator 10, reducing the assembly difficulty and preventing the rotor 20 from generating large deflections.

[0057] The winding teeth formed by the locking part 113 and the protrusion 112 are distributed relatively on the stator core 11, generating a relative suction force on the rotor 20 disposed between the winding teeth, so that the rotor 20 is centered under the action of the suction force, and the rotation position of the rotor 20 is corrected.

[0058] The locking parts 113 are symmetrically arranged, and the two ends of the locking parts 113 generate symmetrical suction forces on the sides of the rotor 20, so that the sides of the rotor 20 are subjected to balanced forces and are centered.

[0059] The stator 10 further includes at least two winding groups 15, which are wound around the stator core 11. Further, the winding groups 15 are wound relative to each of the protrusions 112. The locking portion 113 prevents the winding groups 15 from detaching from the protrusions 112.

[0060] The first wire frame 12 and the second wire frame 13 are installed at both ends of the stator core 11, and the winding group 15 is wound along the first wire frame 12, the stator core 11 and the second wire frame 13.

[0061] The rotor 20 is installed in the receiving space between the locking parts 113, and the rotor 20 moves within the receiving space. When the winding assembly 15 is energized, a magnetic force is generated between the winding assembly 15 and the magnet 23 of the rotor 20, causing the drive shaft 21 to vibrate.

[0062] By providing the winding teeth within the stator core 11, the winding direction of the winding group 15 is changed, and the winding group 15 is symmetrically distributed on opposite sides of the rotor 20. Furthermore, the winding teeth occupy a certain space within the stator core 11, reducing and limiting the movable space of the rotor 20 within the stator 10, preventing large-angle displacement of the rotor 20 within the stator 10, and ensuring that the central axis of the rotor 20 coincides with the central axis of the stator 10. The symmetrically arranged winding teeth ensure that the winding group 15 is symmetrically positioned, resulting in symmetrical suction forces on the rotor 20, which remains centrally distributed under the influence of forces from both sides.

[0063] The stator 10 also includes an insert 14, which is installed inside the stator core 11 and connected to it. The two sides of the insert 14 face the retaining portion 113. After the rotor 20 passes through the receiving space of the stator core 11, the insert 14 is located on one side of the rotor 20, with a certain gap between them. The insert 14 restricts the rotation angle of the rotor 20, thus limiting the angle of reciprocating rotation of the rotor 20. When the rotor 20 rotates in one direction beyond a preset angle, the insert 14 prevents the rotor 20 from continuing to rotate in that direction, preventing the rotor 20 from rotating at a large angle. The rotation angle of the rotor 20 is set according to the operating requirements of the electrical appliance configured with the motor to meet the performance needs of the appliance.

[0064] Further, the insert 14 includes a body 141, at least one fastener 142, at least two resistors 143, and at least one limiting body 144. The fastener 142 and the resistors 143 extend outwardly from two opposing surfaces of the body 141, and the resistors 143 are distributed relatively on the body 141. The insert 14 is embedded in the stator core 11, the fastener 142 is connected to the stator core 11, and the fastener 142 is fastened to the outer peripheral wall 111. After the insert 14 is installed into the stator core 11, each of the resistors 143 is located on one side of the locking portion 113, protruding towards the center of the stator core 11, to prevent the winding assembly 15 from falling off the protrusion 112.

[0065] The limiting body 144 extends protrudingly from the surface of the body 141 and the resist 143 on the same side. The limiting body 144 is located between each of the resists 143. The insert 14 is located on one side of the rotor 20, and the limiting body 144 protrudes towards the rotor 20. The limiting body 144 restricts the rotation angle of the rotor 20 to prevent the rotor 20 from deflecting at a large angle.

[0066] The stator core 11 has an opening 1110 on its outer peripheral wall 111, which reduces the amount of material used to make the outer peripheral wall 111 and lowers the cost of manufacturing it. When the stator 10 is wound, the opening 1110 provides more space for the winding operation, reducing the difficulty of winding.

[0067] Reference Figure 5 and Figure 6The rotor 20 includes a drive shaft 21, a rotor core 22, and at least two magnets 23, with the rotor core 22 and the magnets 23 mounted on the drive shaft 21. The drive shaft 21 includes a transmission part 211 and a mounting part 212, which are integrally formed. The rotor core 22 has a mounting channel at its center for the mounting part 212 to pass through, with one end of the mounting part 212 passing through the mounting channel and protruding from the other end. The rotor core 22 and the mounting part 212 are fixedly connected.

[0068] The rotor core 22 has at least two mounting slots 220. The mounting slots 220 are arranged back-to-back on both sides of the mounting channel of the rotor core 22, symmetrically arranged relative to the drive shaft 21. The opening of each mounting slot 220 faces outwards from the rotor 20. The mounting slots 220 are distributed along the extending direction of the drive shaft 21. Each magnet 23 is correspondingly mounted in one of the mounting slots 220.

[0069] Further, the rotor core 22 includes a fixing portion 221 and at least two mounting portions 222, each of the mounting portions 222 extending integrally outward from both sides of the fixing portion 221. Each mounting portion 222 includes at least two first sidewalls 2221 and at least two second sidewalls 2222. Each first sidewall 2221 extends protrudingly from the fixing portion 221 to both sides. Each second sidewall 2222 extends relative to the outer end of the first sidewall 2221. An included angle is formed between the second sidewall 2222 and the first sidewall 2221. The cross-sections of the second sidewall 2222 and the first sidewall 2221 are approximately L-shaped.

[0070] The mounting groove 220 is formed between the opposing first sidewall 2221 and second sidewall 2222. The magnet 23 is mounted into the mounting groove 2220. The second sidewall 2222 acts as a retaining and locking mechanism for the magnet 23, preventing it from tilting laterally or falling out of the mounting groove 2220. The magnet 23 remains stable.

[0071] In another example of the invention, the magnet 23 is stamped into the mounting groove 220.

[0072] The rotor core 22 and the magnet 23 are mounted on the drive shaft 21, which is installed inside the stator 10. The outer surface of the magnet 23 and the inner surface 1131 of the locking part 113 are opposite to each other. An air gap is formed between the outer surface of the magnet 23 and the inner surface 1131 of the locking part 113.

[0073] The winding teeth formed by the protrusions 112 and the locking parts 113 are symmetrically distributed on both sides of the rotor 20. The magnets 23 of the rotor 20 are symmetrically distributed on the rotor 20, opposite to the winding teeth. The symmetrical distribution of the winding teeth on the stator core 11 generates a symmetrical attractive force on the magnets 23, ensuring uniform force on both sides of the rotor 20. This keeps the rotor 20 centered relative to both sides of the stator 10, enhancing the motor's output power.

[0074] Both sides of the rotor 20 are subjected to force. Under the action of suction, the rotor 20 automatically corrects its rotational position, so that the rotor 20 remains in a centered state.

[0075] The outer casing 30 is installed on the outside of the stator 10 to enclose the stator 10. The cover 40 is installed to one end of the outer casing 30 to close the outer casing 30.

[0076] The motor also includes at least two bearings 24. One end of the mounting portion 212 of the drive shaft 21 extends to the outside of the stator 10, passes through the through hole 401 of the cover 40, and extends to the outside of the cover 40. At least one bearing 24 is installed between the cover 40 and the stator 10, with one end of the mounting portion 212 of the drive shaft 21 passing through the bearing 24 and rotatably connected to the cover 40. One end of the transmission portion 211 of the drive shaft 21 extends through the housing 30 to the outside of the housing 30. Another bearing 24 is installed at the outer end of the housing 30, with one end of the transmission portion 211 of the drive portion 21 passing through the bearing 24 and rotatably connected to the housing 30.

[0077] The rotor 20 contains no plastic parts, eliminating the need for injection molding during its manufacturing process. This facilitates automated machining and reduces manufacturing costs. The rotor core 22 is fixed to the drive shaft 21, and the magnet 23 is also fixed to the rotor core 22. This avoids using plastic parts to connect the magnetic plate and the shaft, making the drive shaft 21 a single unit. Automated machining processes are then used to directly machine the rotor core 22 and the magnet 23 onto the drive shaft 21, resulting in high production efficiency and reduced manufacturing costs. Eliminating plastic parts in the rotor 20 allows it to be entirely constructed of metal and magnetic materials, ensuring stable performance.

[0078] The magnet 23 also has an outer surface 231. In one example of the invention, the outer surface 231 is an arc surface, such that the outer surfaces of the rotor 20 facing the stator core 11 are arc surfaces.

[0079] The stator core 11 has an arc-shaped inner surface 1131, and the rotor 20 has an arc-shaped outer surface 231. After the rotor 20 is assembled into the stator 10, the two sides of the rotor 20 are centered under the attraction of the stator core 11, the outer surface 231 faces the inner surface 1131, the centers of the outer surface 231 and the inner surface 1131 coincide, the distance between the outer surface 231 and the inner surface 1131 is uniform, and the air gap between the rotor 20 and the stator 10 is uniform in size. Figure 6 As shown. The uniform air gap ensures stable motor operation, low energy consumption, and strong output. Furthermore, machining the outer surface 231 of the rotor 20 into an arc surface reduces the air gap between the rotor 20 and the stator 10, decreasing current consumption and increasing motor power.

[0080] Furthermore, Figure 6 The diagram illustrates one motion state of the motor. For example, the upper and lower ends of the magnet 23 are the N pole and the S pole, respectively. When the coil 15 is energized, generating a current in one direction, N poles and S poles are generated on the left and right winding teeth, respectively. The N poles repel each other, generating a pushing force, and the N poles and S poles attract each other, generating a pulling force. Therefore, under the magnetic force, the rotor 20 rotates clockwise. When the coil 15 is energized with a current in the opposite direction, S poles and N poles are generated on the left and right winding teeth, respectively, and under the magnetic force, the rotor 20 rotates counterclockwise.

[0081] When the coil 15 is not energized, the outer surfaces 231 on both sides of the rotor 20 receive the attraction of the inner surfaces 1131 of the winding teeth. The outermost edges of the inner surfaces 1131 and the outermost edges of the outer surfaces 231 are closest to each other, resulting in the greatest attraction. The attraction decreases towards the center. Therefore, the two sides of the inner surfaces 1131 symmetrically generate the greatest attraction to the outer surfaces 231, making the outer surfaces 231 centered relative to the inner surfaces 1131, and the two sides of the rotor 20 centered, maintaining an overall centered state.

[0082] Unlike the motor described in the example above, Figure 7A and Figure 7B A schematic diagram shows the stator formed by assembling the split stator core 11A with the first wire frame 12, the second wire frame 13, and the coil 15. This stator can replace the stator 10 of the aforementioned motor. The first stator core 1101A and the second stator core 1102A are symmetrically assembled with the first wire frame 12 and the second wire frame 13. The winding teeth of the first stator core 1101A and the second stator core 1102A are symmetrically distributed within the stator. The coil 15 is symmetrically wound onto the winding teeth.

[0083] and Figure 7A and Figure 7B The stator shown is different from the one described above. Figure 8A and Figure 8B The first stator core 1101A and the second stator core 1102A of the split stator core 11A shown are symmetrically assembled to a first wire frame 12A and a second wire frame 13A. The first wire frame 12A includes a connecting portion 121A and two filling portions 122A, the filling portions 122A extending symmetrically downward from the bottom end of the connecting portion 121A. The direction of the bottom end and downward is determined according to the illustrated direction only for the purpose of description and is not intended to be limiting. The first stator core 1101A and the second stator core 1102A are assembled with the first wire frame 12A, the filling portions 122A connecting the first stator core 1101A and the second stator core 1102A, filling the opening 1110A between the first stator core 1101A and the second stator core 1102A.

[0084] In another example of the invention, the second wire frame 13A is provided with a filling portion. In another example of the invention, the number of filling portions is one.

[0085] It is also worth mentioning that the outer surfaces on both sides of the rotor 20 can be implemented as arc surfaces or as planes.

[0086] Specifically, refer to Figure 9A and Figure 9B The magnet 23 has an outer surface 231 facing the inner surface 1131 of the locking portion 113. The outer surface 231 is arc-shaped. The air gap between the inner surface 1131 and the outer surface 231 is uniformly distributed.

[0087] Reference Figure 10A and Figure 10B Unlike the embodiments described above, the rotor 20 includes at least two magnets 23A, each magnet 23A being mounted back-to-back in its respective mounting slot 220. Each magnet 23A has an outer surface 231A facing the inner surface 1131. The outer surface 231A is planar, such that the air gap between the outer surface 231A and the inner surface 1131 gradually widens from the outside towards the center.

[0088] When the outer surface 231 of the magnet 23 is arc-shaped, the gap between the inner surface 1131 and the outer surface 231 is uniformly distributed. Compared to the planar outer surface 231A, the air gap between the arc-shaped outer surface 231 and the inner surface 1131 can be designed to be smaller, for example, reducing the air gap at the center of the outer surface 231 and the inner surface 1131. Compared to conventional motors, the structure adopted in this invention can reduce the air gap from more than 0.8mm to 1mm to 0.3mm. The reduction in air gap can enhance the output effect of the rotor 20, making the rotor 20 more powerful.

[0089] Reference Figure 4 and Figure 5 As shown, the cover 40 is provided with a through hole 401, and one end of the mounting portion 212 of the drive shaft 21 extends through the through hole 401 to the outside of the cover 40. The cover 40 is also provided with at least two grooves 402, which are provided on both sides of the through hole 401.

[0090] In another example of the invention, the motor further includes an elastic element 50, which is mounted on the outside of the cover 40. Both ends of the elastic element 50 extend into the groove 402 and are fixed. The body of the elastic element 50 is connected to the end of the mounting portion 212 of the drive shaft 21. The elastic element 50 undergoes elastic deformation as the drive shaft 21 moves.

[0091] The main body of the elastic element 50 and the end of the drive shaft 21 extending to the outer side of the cover 40 are engaged. The elastic element 50 is distributed on the cover 40. The elastic element 50 is capable of elastic deformation in at least two directions. When the winding group 15 of the stator 10 is energized, a magnetic field is generated, and the rotor 20 rotates under the action of magnetic thrust.

[0092] If the rotor 20 deflects relative to its initial centered state, the drive shaft 21 causes the elastic element 50 to undergo elastic deformation. The elastic element 50 generates a restoring force in the opposite direction, causing the drive shaft 21 to return to its initial centered state. In other words, the elastic element 50 can use its elastic restoring force to cause the drive shaft 21 to rotate back to the centered state of the outer surface 231 when the drive shaft 21 deflects in its rotational position, thus automatically correcting the rotational position of the drive shaft 21.

[0093] The elastic element 50 vibrates in response to the vibration of the drive shaft 21, and the elastic element 50 and the drive shaft 21 resonate. When the drive shaft 21 deflects relative to its initial state, the elastic element 50 deforms and rotates the drive shaft 21 back to its initial state through a rebound force. This allows the drive shaft 21 to return to its initial state by relying on the rebound force of the elastic element 50 without consuming its own output force. Therefore, the output force consumption of the rotor 20 is reduced, and the output effect is enhanced.

[0094] By setting symmetrically arranged winding teeth and the elastic element 50, the rotational position of the rotor 20 is automatically corrected in two ways, ensuring that the two sides of the outer surface 231 of the rotor 20 can be centered and move stably, so that the electrical equipment using the motor provided by the present invention has stable performance.

[0095] The elastic element 50 can be integrally molded with the cover 40 through injection molding, or the elastic element 50 and the cover 40 can be fixedly installed. The cover 40 and the outer shell 30 can be detachably connected, which facilitates the maintenance and replacement of the cover 40, as well as the maintenance and replacement of parts inside the motor.

[0096] In addition, the elastic element 50 has low noise, strong reset capability, and is easy to install.

[0097] In the above example of the present invention, the elastic element 50 is laterally distributed relative to the motor. In another example of the present invention, the elastic element may be longitudinally distributed. One end of the elastic element is mounted to one end of the drive shaft, and the other end of the elastic element is fixed to the cover. The elastic element is distributed along the extension direction of the drive shaft and deforms with the vibration of the drive shaft.

[0098] It is worth mentioning that the stator core used in this invention can achieve the centering state of the rotor, reducing the output power consumption of the rotor. In other examples of this invention, the elastic element is added to further enhance the centering effect of the rotor. That is to say, even without the elastic element, the centering effect of the rotor can be achieved by simply using the stator core.

[0099] The motor provided by this invention can be applied to various small electrical appliances such as electric toothbrushes, facial cleansing devices, and massagers, providing stable kinetic energy to the working parts of these appliances and ensuring good working results.

[0100] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. An electric machine, characterized by The motor comprises: a rotor, two sides of the rotor respectively having an outer surface, the rotor comprising a rotor core and a driving shaft, the driving shaft penetrating through the rotor core; a stator, the stator comprising a stator core, an inner side of the stator core being symmetrically provided with at least two winding teeth, the two winding teeth having symmetrically two inner surfaces, the two inner surfaces being arc surfaces, the two winding teeth respectively generating symmetrically suction force on two sides of the rotor, so that the two sides of the rotor are respectively centered with respect to the winding teeth; the stator core comprising at least one outer peripheral wall, at least two protruding portions and two clamping portions, each of the protruding portions being protrudingly extended from an inner side of the outer peripheral wall to a center of the stator core, each of the clamping portions being bently extended from an end of the protruding portion close to the center of the stator core to two sides to form the winding teeth arranged oppositely; the motor further comprising at least one elastic member, the elastic member being mounted to the rotor to resonate with movement of the rotor, wherein the elastic member is deformed when the rotor moves to provide elastic force for the two sides of the rotor to return to a centered state; the motor further comprising a housing and a cover, the housing being mounted to an outer side of the stator, the cover being covered on one end of the housing to seal the stator; the elastic member being connected to the cover and the driving shaft respectively, an extension direction of the elastic member being the same as an extension direction of the cover; the elastic member being capable of elastically deforming in at least two directions; the stator further comprising at least one embedded body, the embedded body being mounted to an inner side of the stator core and located on one side of the rotor, the embedded body comprising a main body, at least one buckling body, at least two blocking bodies and at least one limiting body, the buckling body and each of the blocking bodies being protrudingly extended from two surfaces of the main body facing away from each other, the limiting body being formed between each of the blocking bodies, wherein each of the blocking bodies is located on one side of the clamping portion, and the limiting body is located on one side of the rotor to limit a rotation angle of the rotor.

2. The motor according to claim 1, wherein the outer peripheral wall is in a U shape.

3. The motor according to claim 1, wherein the stator core is a split core, the stator core comprising a first stator core and a second stator core, the first stator core and the second stator core being symmetrically arranged, the first stator core and the second stator core respectively having the arc-shaped outer peripheral wall, and the protruding portions and the clamping portions being symmetrically formed on an inner side of the outer peripheral wall.

4. The motor according to any one of claims 2 to 3, wherein the stator further comprises a first wire holder and a second wire holder, the first wire holder and the second wire holder being assembled with two ends of the stator core.

5. The motor according to claim 1, wherein the rotor further comprises at least two magnets, the rotor core having at least two mounting grooves arranged oppositely, each of the magnets being mounted to the mounting groove.

6. The electric machine of claim 5, wherein an outer surface of the magnet facing an outer surface of the inner surface of the stator core is curved, and air gaps between the outer surface of the magnet and the inner surface of the stator core are uniformly distributed.

7. The electric machine of claim 5, wherein an outer surface of the magnet facing an outer surface of the inner surface of the stator core is flat.

8. The electric machine of claim 5, wherein the rotor core comprises a fixed portion and at least two mounting portions, each of the mounting portions extending outwardly from two sides of the fixed portion, and each of the mounting portions comprises at least two first side walls and at least two second side walls symmetrically arranged, and a included angle is formed between the first side walls and the second side walls, and the second side walls limit lateral movement of the magnet from the mounting slots to the rotor core.

9. The electric machine of claim 1, wherein at least two bearings are connected between the housing and the drive shaft, and the bearings are respectively arranged at two ends of the housing and connected with the drive shaft to support movement of the drive shaft.

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