CN111478463A - Electric machine - Google Patents

Abstract

The invention provides a motor, which comprises a rotor and a stator, wherein two sides of the rotor are respectively provided with an outer surface, the stator comprises a stator iron core, the inner side of the stator iron core is symmetrically provided with at least two winding teeth, the two winding teeth are provided with two symmetrical inner surfaces and are opposite to the outer surface of the rotor, the inner surfaces are cambered surfaces, and the winding teeth respectively generate symmetrical suction force to the two sides of the rotor so that the two sides of the rotor are respectively centered relative to the winding teeth.

Description

Electric machine

Technical Field

The invention relates to the technical field of motors, in particular to a motor.

Background

The motor has wide application in the field of electric appliances. With the improvement of the social living standard, small electric appliances such as electric toothbrushes and electric beauty instruments are favored by more and more consumers. The working parts of such small electric appliances need to be driven by a motor to reciprocate for cleaning, massaging, etc. The angle, distance, frequency, stability, etc. of the reciprocating motion of the working member have an influence on the working effect. The performance of the motor is decisive for the working effect of the working parts. The general motor directly twines the coil in stator core, and the rotor passes the space in the middle of the stator core, and the space of accommodating the rotor in the stator core is great, has great interval between rotor and the stator, and when the relative stator motion of rotor, can produce the deflection, leads to the pivot deflection of rotor, influences the working effect of working element.

Referring to fig. 1, a stator core 10P of a conventional motor is schematically shown, the stator core 10P includes a winding portion 11P and two side portions 12P, and the winding portion 11P and the two side portions 12P 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 to form a hollow accommodating space. The stator core 10P is U-shaped. The side portion 12P has an inner surface 121P, and the inner surface 121P is a plane. The enamel wire is wound to the winding portion 11P. The rotor passes through the housing space of the stator core 10P. The stator core 10P is wound on one side. The stator core 10P generates a unilateral electromagnetic field to the rotor, which easily causes the rotor to be deviated. The rotor deflects, and the air gap between the stator and the rotor changes, which can affect the output effect of the motor, thereby affecting the working effect of the electric appliance. In addition, since the inner surface 121P of the side portion 12P is a plane, the air gap between the side portion 12P and the rotor is not uniform, which affects the force effect of the rotor. The suction force generated by the inner side of the side portion 12P to the two sides of the rotor is unbalanced, and the suction force cannot be centered effectively, so that energy is consumed in centering during movement, and the output effect of the rotor is also influenced.

In addition, the rotor has a complex structure and multiple processes, and parts such as a rotating shaft, a magnetic conduction plate and the like need to be processed through plastic parts or injection molding processes, so that the rotor cannot be automatically processed effectively, and the production efficiency is low.

Disclosure of Invention

An advantage of the present invention is to provide an electric machine with the rotor of the machine effectively centered on both sides, reducing the energy consumption for rotational position correction.

Another advantage of the present invention is to provide a motor having a stator with a small receiving space, which limits the moving space of the rotor in the stator and prevents the rotor from deviating the moving track.

Another advantage of the present invention is to provide an electric motor, wherein the stator includes a stator core, and at least two winding teeth are oppositely disposed at an inner side of the stator core for winding, so that coils are oppositely distributed to generate a suction force to both sides of the rotor, thereby balancing a rotation position of the rotor and maintaining the center.

Another advantage of the present invention is to provide an electric motor in which the stator core is provided with openings so that heat generated inside the stator core is directly transferred to a housing of the electric motor, thereby enhancing a heat dissipation effect.

Another advantage of the present invention is to provide an electric motor in which air gaps between inner surfaces of the winding teeth of the stator core and outer surfaces of the magnets of the rotor are uniformly distributed, so that the air gaps can be smaller under machining, and the force effect of the rotor can be enhanced.

Another advantage of the present invention is to provide a motor that does not have plastic parts, eliminating the need for injection molding processes and facilitating automated manufacturing.

Another advantage of the present invention is to provide a motor, which further includes at least one elastic member, wherein the elastic member rotates the rotor back to the centered state by an elastic restoring force when the driving shaft is deflected, thereby achieving an automatic correction effect.

Another advantage of the present invention is to provide a motor, in which the elastic member is mounted to an end of the motor and coupled to the driving shaft to generate a resonance point.

Additional advantages and features of the invention will be set forth in the detailed description which follows and in part will be apparent from the description, or may be learned by practice of the invention as set forth hereinafter.

In accordance with one aspect of the present invention, the foregoing and other objects and advantages are achieved in the present invention which comprises:

the two sides of the rotor are respectively provided with an outer surface; and

the stator comprises a stator core, at least two winding teeth are symmetrically arranged on the inner side of the stator core, the two winding teeth are provided with two symmetrical inner surfaces and are opposite to the outer surface of the rotor, the inner surfaces are cambered surfaces, and the winding teeth respectively generate symmetrical suction to the two sides of the rotor so that the two sides of the rotor are respectively opposite to the winding teeth in the middle.

According to an embodiment of the invention, the stator core comprises at least one peripheral wall, at least two protruding parts and two clamping parts, wherein the protruding parts are formed by extending from the inner side of the peripheral wall to the center of the stator core in a protruding mode, and the clamping parts are formed by extending from the end parts, close to the center of the stator core, of the protruding parts to two sides in a bending mode respectively so as to form the winding teeth which are arranged oppositely.

According to one embodiment of the invention, the peripheral wall is U-shaped.

According to an 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 the arc-shaped outer peripheral walls, and the protrusion and the detent are symmetrically formed inside the outer peripheral walls.

According to an embodiment of the present invention, the stator further includes a first bobbin and a second bobbin, and the first bobbin and the second bobbin are fitted to both ends of the stator core.

According to an embodiment of the present invention, the stator further includes at least one inlay mounted inside the stator core on one side of the rotor, wherein the inlay limits a rotation angle of the rotor to vibrate the driving shaft within a certain range.

According to an embodiment of the present invention, the inlay includes a body, at least one buckle body, at least two resistance bodies and at least one position limiting body, the buckle body and each resistance body are respectively formed by extending outward from two surfaces of the body opposite to each other, the position limiting body is formed between the resistance bodies, wherein each resistance body is respectively located at one side of the position clamping portion, and the position limiting body is located at one side of the rotor to limit a rotation angle of the rotor.

According to one embodiment of the present invention, the rotor includes a rotor core, a driving shaft passing through the rotor core, and at least two magnets, the rotor core has at least two mounting grooves disposed back to back, and the magnets are respectively mounted in the mounting grooves.

According to one embodiment of the present invention, an outer surface of the magnet facing the inner surface of the stator core is a curved surface, and air gaps between the outer surface of the magnet and the inner surface of the stator core are uniformly distributed.

According to an embodiment of the present invention, an outer surface of the magnet facing the inner surface of the stator core is a flat surface.

According to an embodiment of the present invention, the rotor core includes a fixing portion and at least two mounting portions, each of the mounting portions extends outward from two sides of the fixing portion, each of the mounting portions includes at least two first side walls and at least two second side walls, which are symmetrically arranged, an 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 groove to the rotor core.

According to an embodiment of the present invention, the motor further includes a housing installed outside the stator, and a cover body covered at one end of the housing to close the stator.

According to an embodiment of the present invention, the motor further comprises at least one elastic member mounted to the rotor to resonate with the movement of the rotor, wherein the elastic member is deformed when the rotor moves to provide a resilient force for both sides of the rotor to return to a centered state.

According to one embodiment of the present invention, the elastic member is connected to the cover and the driving shaft, respectively, and the extending direction of the elastic member is the same as the extending direction of the cover.

According to one embodiment of the present invention, the elastic member is connected to the cover and the driving shaft, respectively, and the extending direction of the elastic member is the same as the extending direction of the driving shaft.

According to one embodiment of the invention, at least two bearings are connected between the housing and the drive shaft, the bearings being respectively arranged at both ends of the housing and connected to the drive shaft for supporting the movement of the drive shaft.

Further objects and advantages of the invention will be fully apparent from the ensuing description and drawings.

These and other objects, features and advantages of the present invention will become more fully apparent from the following detailed description, the accompanying drawings and the claims.

Drawings

Fig. 1 is a schematic view of a stator core of an electric machine according to the prior art.

Fig. 2A and 2B are schematic views of a stator core of an electric machine according to a preferred embodiment of the present invention.

Fig. 3A and 3B are schematic views of a stator core of an electric machine according to a preferred embodiment of the present invention.

Fig. 4 is a perspective view of a motor according to a preferred embodiment of the present invention.

Fig. 5 is an exploded view of a motor according to a preferred embodiment of the present invention.

Fig. 6 is a schematic cross-sectional view of an electric machine according to a preferred embodiment of the invention.

Fig. 7A and 7B are schematic views of a stator of an electric machine according to a preferred embodiment of the present invention.

Fig. 8A and 8B are schematic views of a stator of an electric machine according to a preferred embodiment of the present invention.

Fig. 9A and 9B are schematic views of a rotor of an electric machine according to a preferred embodiment of the present invention.

Fig. 10A and 10B are schematic views of a rotor of an electric machine according to a preferred embodiment of the present invention.

Detailed Description

The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention, as defined in the following description, may be applied to other embodiments, variations, modifications, equivalents, and other technical solutions without departing from the spirit and scope of the invention.

It will be understood by those skilled in the art that in the present disclosure, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular orientation, and thus the above terms are not to be construed as limiting the present invention.

It is understood that the terms "a" and "an" should be interpreted as meaning that a number of one element or element is one in one embodiment, while a number of other elements is one in another embodiment, and the terms "a" and "an" should not be interpreted as limiting the number.

Referring to the drawings of fig. 2A-10B of the present specification, an electric machine and a stator core thereof according to a preferred embodiment of the present invention are disclosed and described in the following description.

Fig. 2A and 2B show a stator core 11 modified from an existing stator core. The stator core 11 has an outer peripheral wall 111, and the outer peripheral wall 111 is U-shaped. The peripheral wall 111 has an opening 1110. The stator core 11 further includes at least two protruding portions 112 and at least two latching portions 113. Each of the protrusions 112 is formed to protrude from the inner side of the outer peripheral wall 111 toward the center thereof by a predetermined distance. The protrusions 113 extend along the peripheral wall 111 and are distributed in parallel with the central axis. The protrusions 112 are symmetrically distributed in a protruding manner inside the outer circumferential wall 111. The protrusions 112 are respectively disposed on two sides of the opening 1110.

The engaging portion 113 is formed by extending from an end portion of the protruding portion 112 near the center to both sides in a certain curve. A space in which the winding is possible is formed between the engaging portion 113 and the inside of the outer peripheral wall 111, and both ends of the engaging portion 113 are formed to extend in a curved manner in the center direction of the stator core 11. The surface of the retainer 113 facing the center side is a curved surface having a certain curvature. In other words, the positioning portion 113 has an inner surface 1131, and the inner surface 1131 is an arc surface. The inner surfaces 1131 of the retaining portions 113 are disposed opposite to each other, and a receiving space is formed between the inner surfaces 113 for receiving a rotor.

That is, at least one set of winding teeth is oppositely disposed inside the outer peripheral wall 111 of the stator core 11. The winding teeth are additionally arranged in the stator core 11 to limit the accommodating space of the stator core 10, limit the moving range of the rotor and be beneficial to keeping the rotor centered. And the surfaces of the winding teeth are set to be cambered surfaces, so that an air gap between the stator and the rotor is uniform, and the output effect of the rotor is enhanced. The winding teeth are oppositely arranged, so that relative suction is generated to the rotor, the rotor is kept centered, and the rotation position of the rotor is automatically corrected.

Fig. 3A and 3B provide a stator core 11A for a deformation of the stator core 11, where the winding teeth have the same structure, and the parts with the same reference numerals are not repeated, except that the stator core 11A has a split structure, and includes 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 a stator and a motor. The first stator core 1101A and the second stator core 1102A are formed with the protruding portions 112 and the catching portions 113, respectively, and form the inner surface 1131 of a curved surface. When assembled to the motor, the first stator core 1101A and the second stator core 1102A form two openings 1110 therebetween.

As shown in fig. 4 to 6, the motor includes a stator 10 and a rotor 20, and the stator 10 is sleeved outside the rotor 20. The rotor 20 is inserted inside the stator 10. The rotor 20 moves in the center of the stator 10. Preferably, the central axis of the rotor 20 and the central axis of the stator 10 coincide. The stator 10 is electrified to generate a magnetic field, and the rotor 20 is driven to vibrate under the action of magnetic force. Further, the stator 10 drives the rotor 20 to oscillate. The rotor 20 is reciprocally rotated by a certain angle.

The motor further includes a housing 30 and at least one cover 40, wherein the housing 30 is mounted outside the stator 10 to cover the stator 10. The cover 40 is covered at one end of the housing 30, and encloses the stator 10 together with the housing 30. The central axes of the stator 10, the rotor 20 and the housing 30 are coincident, so that the assembly is convenient.

The stator 10 includes the stator core 11, a first bobbin 12 and a second bobbin 13, and the first bobbin 12 and the second bobbin 13 are respectively installed at both ends of the stator core 11. The first bobbin 12 and the second bobbin 13 are made of an insulating material. The stator core 11 may be formed by laminating and punching a plurality of silicon steel sheets in a direction parallel to the central axis thereof.

Referring to fig. 2A to 4, the rotor 20 is inserted between the winding teeth, and the winding teeth are uniformly and symmetrically distributed on the outer circumference of the rotor 20.

The retaining portion 113 and the protruding portion 112 further define a receiving space surrounded by the outer peripheral wall 111, so as to limit a moving space of the rotor 20 in the stator 10, and also limit a space when the rotor 20 is assembled into the stator 10, thereby reducing the assembly difficulty and preventing the rotor 20 from large deflection.

The winding teeth formed by the catching portions 113 and the protruding portions 112 are relatively distributed on the stator core 11, and generate a relative suction force to the rotor 20 disposed between the winding teeth, so that the rotor 20 is centered under the suction force, and the rotation position of the rotor 20 is corrected.

The clamping portions 113 are symmetrically arranged, and two ends of each clamping portion 113 generate symmetrical suction to the side surface of the rotor 20, so that the side surfaces of the rotor 20 are evenly stressed and centered.

The stator 10 further includes at least two winding groups 15, and the winding groups 15 are wound around the stator core 11. Further, the winding groups 15 are oppositely wound around the respective protrusions 112. The retaining portion 113 prevents the winding set 15 from falling off from the protrusion 112.

The first bobbin 12 and the second bobbin 13 are mounted at both ends of the stator core 11, and the winding groups 15 are wound along the first bobbin 12, the stator core 11, and the second bobbin 13.

The rotor 20 is attached to the housing space between the retaining portions 113, and the rotor 20 moves in the housing space. When the winding set 15 is energized, a magnetic force is generated between the winding set 15 and the magnet 23 of the rotor 20, so that the driving shaft 21 is vibrated.

By providing the winding teeth in the stator core 11, the winding direction of the winding groups 15 is changed, and the winding groups 15 are symmetrically distributed on opposite sides of the rotor 20. Furthermore, the winding teeth occupy a certain space inside the stator core 11, reducing and defining a space in which the rotor 20 is movable inside the stator 10, so as to prevent the rotor 20 from being displaced in a large angle inside the stator 10, and the central axis of the rotor 20 can be kept coincident with the central axis of the stator 10. The symmetrically arranged winding teeth enable the winding groups 15 to be symmetrically arranged, so that the rotor 20 is subjected to symmetrical suction force, and the rotor 20 is centrally distributed under the action of force applied from two sides.

The stator 10 further includes an inlay 14, and the inlay 14 is mounted inside the stator core 11 and connected to the stator core 11. Both side portions of the inlay 14 face the retaining portions 113. After the rotor 20 passes through the receiving space of the stator core 11, the inlay 14 is located at one side of the rotor 20, and a certain space is provided between the inlay and the rotor 20. The inlay 14 restricts the rotational angle of the rotor 20 so that the angle of the rotor 20 to rotate back and forth is defined. When the rotor 20 rotates in one direction beyond a predetermined angle, the inlay 14 blocks 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 working requirements of the electrical appliance configuring the motor, so as to meet the performance requirements of the electrical appliance.

Further, the inlay 14 includes a body 141, at least one buckle 142, at least two blocks 143, and at least one position-limiting body 144. The buckle body 142 and the blocking bodies 143 are respectively formed by extending outward from two opposite surfaces of the body 141 in a protruding manner, and each blocking body 143 is oppositely distributed on the body 141. The inlay 14 is inserted into the stator core 11, the button 142 is connected to the stator core 11, and the button 142 is fastened to the outer circumferential wall 111. After the inlay 14 is mounted on the stator core 11, the blocking bodies 143 are respectively located at one side of the positioning portion 113 and protrude toward the center of the stator core 11 to block the winding set 15 from falling off from the protruding portion 112.

The stopper 144 is formed by extending convexly from the surface of the body 141 and the stopper 143 on the same side. The limiting body 144 is located between the resistors 142. The inlay 14 is located on one side of the rotor 20, and the retainer 144 is raised toward the rotor 20. The stopper 144 limits the rotation angle of the rotor 20 to prevent the rotor 20 from deflecting at a large angle.

The outer peripheral wall 111 of the stator core 11 is provided with the opening 1110, so that the material of which the outer peripheral wall 111 is made is reduced, reducing the cost of manufacturing the outer peripheral wall 111. When the stator 10 is wound, the opening 1110 provides a larger space for the winding operation, and reduces the winding difficulty.

Referring to fig. 5 and 6, the rotor 20 includes a driving shaft 21, a rotor core 22, and at least two magnets 23, and the rotor core 22 and the magnets 23 are mounted to the driving shaft 21. The driving shaft 21 includes a transmission portion 211 and a mounting portion 212, and the transmission portion 211 and the mounting portion 212 are integrally formed. The center of rotor core 22 has an installation channel for installation portion 212 to pass through, and one end of installation portion 212 passes through the installation channel of rotor core 22, exposes from the other end. The rotor core 22 and the mounting portion 212 are fixedly connected.

The rotor core 22 has at least two mounting grooves 220. The mounting grooves 220 are disposed back to back, located at both sides of the mounting passage of the rotor core 22, and symmetrically arranged with respect to the driving shaft 21. The mounting grooves 220 are opened toward the outer side of the rotor 20, respectively. The mounting grooves 220 are distributed along the extending direction of the driving shaft 21. Each of the magnets 23 is correspondingly mounted to the mounting groove 220.

Further, the rotor core 22 includes a fixing portion 221 and at least two mounting portions 222, each of the mounting portions 222 is integrally extended from two sides of the fixing portion 221, each of the mounting portions 222 includes at least two first side walls 2221 and at least two second side walls 2222, each of the second side walls 2221 is convexly extended from the fixing portion 221 to two sides, each of the second side walls 2222 is oppositely extended from an outer end of the first side wall 2221, an included angle is formed between the second side wall 2222 and the first side wall 2221, and the cross sections of the second side wall 2222 and the first side wall 2221 are substantially L-shaped.

The mounting groove 220 is formed between the first and second opposite side walls 2221 and 2222. The magnet 23 is mounted to the mounting groove 2220. The second side wall 2222 has a limiting and buckling function on the magnet 23, so that the magnet 23 is prevented from inclining or falling off from the mounting groove 2220 to the lateral direction. The magnet 23 remains stable.

In another example of the present invention, the magnet 23 is punched into the mounting groove 220.

The rotor core 22 and the magnet 23 are attached to a drive shaft 21, and the drive shaft 21 is attached to the inside of the stator 10, and the outer surface of the magnet 23 is opposed to the inner surface 111 of the detent portion 113. An air gap is formed between the outer surface of the magnet 23 and the inner surface 1131 of the capture portion 113.

The winding teeth formed by the protruding portion 112 and the capture portion 113 are symmetrically distributed on two sides of the rotor 20, and the magnets 23 of the rotor 20 are symmetrically distributed on the rotor 20, opposite to the winding teeth. The winding teeth of the stator core 11 are symmetrically distributed to generate symmetric attraction to the magnet 23, so that the two sides of the rotor 20 are uniformly stressed, the rotor 20 is kept in a centered state relative to the two sides of the stator 10, and the output effect of the motor is enhanced.

Both sides of the rotor 20 are stressed, and under the action of suction, the rotor 20 is automatically corrected in rotation position, so that the rotor 20 is kept in a centered state.

The housing 30 is installed at the outside of the stator 10 to wrap the stator 10. The cover 40 is mounted to one end of the housing 30 to close the housing 30.

The motor further comprises at least two bearings 24. One end of the mounting portion 212 of the driving 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, and one end of the installation part 212 of the driving shaft 21 is rotatably connected to the cover 40 through the bearing 24. 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 an outer end of the housing 30, and one end of the transmission part 211 of the driving part 21 passes through the bearing 24 and is rotatably connected with the housing 30.

The rotor 20 is not provided with plastic parts, so that an injection molding process can be omitted in the processing process of the rotor 20, the automatic processing of the rotor 20 is facilitated, and the manufacturing cost is reduced. Will rotor core 22 is fixed to drive shaft 21, will magnet 23 fixed value rotor core 22 avoids using the working of plastics to carry out the connection of magnetic conduction board and pivot, drive shaft 21 forms a whole to adopt automatic processing technology directly with rotor core 22 with magnet 23 processing extremely drive shaft 21, production efficiency is high, reduces technology cost. Plastic parts are omitted from the rotor 20, so that the rotor 20 is made of metal materials and magnetic materials integrally and is stable in performance.

The magnet 23 also has an outer surface 231. In one example of the present invention, the outer surface 231 is a curved surface, so that the outer surfaces of both sides of the rotor 20 facing the stator core 11 are curved surfaces.

The stator core 11 has the inner surface 1131 with an arc surface, the rotor 20 has the outer surface 231 with an arc surface, after the rotor 20 is assembled in the stator 10, two sides of the rotor 20 are centered under the suction force 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 are overlapped, the distance between the outer surface 231 and the inner surface 1131 is uniform, and the size of the air gap between the rotor 20 and the stator 10 is uniform, as shown in fig. 6. The uniform air gap ensures that the motor runs stably, the energy consumption is lower, and the output effect is strong. In addition, the outer surface 231 of the rotor 20 is processed into a cambered surface, so that an air gap between the rotor 20 and the stator 10 is reduced, current consumption is reduced, and motor power is improved.

Further, fig. 6 shows a motion state of the motor, for example, the upper and lower ends of the magnet 23 are respectively an N pole and an S pole. When the coil 15 is energized to generate a current in one direction, an N pole and an S pole are generated at the left winding tooth and the right winding tooth, respectively. The N pole and the N pole repel each other to generate thrust, and the N pole and the S pole attract each other to generate attraction, so that the rotor 20 rotates clockwise under the magnetic force. When the coil 15 is energized with a current in a reverse direction, an S pole and an N pole are generated at the left and right winding teeth, respectively, and the rotor 20 rotates counterclockwise under a magnetic force.

When the coil 15 is not energized, the outer surfaces 231 on both sides of the rotor 20 receive the attractive force from the inner surfaces 1131 of the winding teeth, respectively. The two extreme edge positions of the inner surface 1131 and the two extreme edge positions of the outer surface 231 are closest to each other, the suction force is the largest, and the suction force is smaller toward the middle, so that the two sides of the inner surface 1131 symmetrically generate the largest suction force to the outer surface 231, so that the outer surface 231 is centered relative to the inner surface 1131, and the two sides of the rotor 20 are respectively centered to maintain the overall centered state.

Unlike the motor in the above example, fig. 7A and 7B show schematic views in which the split stator core 11A is assembled with the first bobbin 12, the second bobbin 13, and the coil 15 to form the stator. The stator may replace the stator 10 of the above-described motor. The first stator core 1101A and the second stator core 1102A are symmetrically assembled with the first bobbin 12 and the second bobbin 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 to the winding teeth.

Unlike the stator shown in fig. 7A and 7B, the first and second stator cores 1101A and 1102A of the split type stator core 11A shown in fig. 8A and 8B are symmetrically assembled to a first bobbin 12A and a second bobbin 13A. The first bobbin 12A includes a connection portion 121A and two filling portions 122A, and the filling portions 122A are formed by extending downward from the bottom end of the connection portion 121A symmetrically. The orientation of the bottom end and below are determined from the orientation shown in the drawings for convenience of description only and not by way of limitation. The first and second stator cores 1101A and 1102A and the first bobbin 12A are assembled, and the filling portion 122A connects the first and second stator cores 1101A and 1102A, and fills the opening 1110A between the first and second stator cores 1101A and 1102A.

In another example of the present invention, the second bobbin 13A is provided with a filling portion. In another example of the present invention, the number of the filling portions is 1.

It is also worth mentioning that the outer surfaces of both sides of the rotor 20 may be implemented as a cambered surface, but also as a planar surface.

Specifically, referring to fig. 9A and 9B, the magnet 23 has an outer surface 231, and the outer surface 231 faces the inner surface 1131 of the capture portion 113. The outer surface 231 is a curved surface. The air gap between the inner surface 1131 and the outer surface 231 is uniformly distributed.

Referring to fig. 10A and 10B, unlike the above-described embodiment, the rotor 20 includes at least two magnets 23A, and each of the magnets 23A is mounted in each of the mounting grooves 220 in a back-to-back manner. The magnet 23A has an outer surface 231A, the outer surface 231A facing the inner surface 1131. The outer surface 231A is a plane such that an air gap between the outer surface 231A and the inner surface 1131 is gradually enlarged from the outside toward the center.

When the magnet 23 has the outer surface 231 having an arc surface, the gap between the inner surface 1131 and the outer surface 231 is uniformly distributed, and the air gap between the outer surface 231 having an arc surface and the inner surface 1131 may be designed to be smaller relative to the outer surface 231A having a flat surface, for example, to reduce the air gap at the center position of the outer surface 23 and the inner surface 1131. Compared with the traditional motor, the structure adopted by the invention can enable the air gap to be from 0. 8mm to 1. mm or more, and is reduced to 0. 3 mm. Reducing the air gap can enhance the force effect of the rotor 20, resulting in a stronger performance of the rotor 20.

Referring to fig. 4 and 5, the cover 40 is provided with a through hole 401, and one end of the mounting portion 211 of the driving shaft 21 extends to the outside of the cover 40 through the through hole 401. The cover 40 is further provided with at least two grooves 402, and the grooves 402 are disposed on two sides of the through hole 401.

In another example of the present invention, the motor further includes an elastic member 50, and the elastic member 50 is installed at an outer side of the cover 40. Both ends of the elastic member 50 extend into the grooves 402 and are fixed. The main body of the elastic member 50 is coupled to an end of the mounting portion 211 of the driving shaft 21. The elastic member 50 is elastically deformed according to the movement of the driving shaft 21.

The main body of the elastic member 50 is engaged with an end of the driving shaft 21 extending to the outside of the cover 40. The elastic member 50 is distributed on the cover 40. The elastic member 50 is capable of elastic deformation in at least two directions. When the winding groups 15 of the stator 10 are energized to generate a magnetic field, the rotor 20 rotates under the action of magnetic thrust.

If the rotor 20 deflects from the initial centered state, the driving shaft 21 drives the elastic member 50 to elastically deform. The elastic member 50 generates a restoring force in a reverse direction to bring the driving shaft 21 back to the initial centered state. That is, the elastic member 50 may rotate the driving shaft 21 back to the central state of the outer surface 231 by the elastic restoring force when the driving shaft 21 generates the rotation position deflection, so as to automatically correct the rotation position of the driving shaft 21.

The elastic member 50 vibrates with the vibration of the drive shaft 21, and the elastic member 50 and the drive shaft 21 resonate. When the driving shaft 21 deflects relative to the initial state, the elastic member 50 deforms, and the driving shaft 21 is rotated back to the initial state by the resilience force, so that the driving shaft 21 depends on the resilience force of the elastic member 50 when returning to the initial state, and the self-output force does not need to be consumed, therefore, the output force consumption of the rotor 20 is reduced, and the output force effect is enhanced.

By arranging the symmetrically arranged winding teeth and the elastic piece 50, the double automatic correction function is realized on the rotation position of the rotor 20, the two sides of the outer surface 231 of the rotor 20 can be ensured to be centered and stably move, and the electric equipment adopting the motor provided by the invention has stable performance.

The elastic member 50 may be integrally formed with the cover 40 by an injection molding process, or the elastic member 50 and the cover 40 may be fixedly mounted. The cover 40 and the housing 30 may be implemented to be detachably coupled, facilitating maintenance and replacement of the cover 40, as well as maintenance and replacement of parts inside the motor.

In addition, the elastic member 50 has low noise, strong restorability, and is easy to install.

In the above example of the present invention, the elastic members 50 are distributed laterally with respect to the motor. In another example of the present invention, the elastic members may be longitudinally distributed. One end of the elastic member is attached to one end of the driving shaft, and the other end of the elastic member is fixed to the cover. The elastic member is distributed along the extending direction of the driving shaft and deforms along with the vibration of the driving shaft.

It is worth mentioning that the stator core adopted by the invention can realize the centering state of the rotor, and the output consumption of the rotor is reduced. In other examples of the invention, the resilient member is added to further enhance the centering effect of the rotor. That is, without the elastic member, the stator core is optically energized to achieve the centering effect of the rotor.

The motor provided by the invention can be applied to various small-sized electric appliances such as electric toothbrushes, facial cleaning instruments, massage instruments and the like, provides stable kinetic energy for the working parts of the electric appliances and ensures good working effect.

It will be appreciated by persons skilled in the art that the embodiments of the invention described above and shown in the drawings are given by way of example only and are not limiting of the invention. The objects of the invention have been fully and effectively accomplished. The functional and structural principles of the present invention have been shown and described in the examples, and any variations or modifications of the embodiments of the present invention may be made without departing from the principles.

Claims (16)

1. An electric machine, comprising:

the two sides of the rotor are respectively provided with an outer surface; and

the stator comprises a stator core, at least two winding teeth are symmetrically arranged on the inner side of the stator core, the two winding teeth are provided with two symmetrical inner surfaces and are opposite to the outer surface of the rotor, the inner surfaces are cambered surfaces, and the winding teeth respectively generate symmetrical suction to the two sides of the rotor so that the two sides of the rotor are respectively opposite to the winding teeth in the middle.

2. The motor according to claim 1, wherein the stator core includes at least one peripheral wall, at least two protrusions and two detents, each of the protrusions is formed to protrude from an inner side of the peripheral wall toward a center of the stator core, and each of the detents is formed to extend from an end of the protrusion near the center of the stator core to both sides in a bent manner, so as to form the winding teeth arranged oppositely.

3. The electric machine of claim 2 wherein said peripheral wall is U-shaped.

4. The motor according to claim 2, wherein 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 the arc-shaped outer peripheral walls, and the protrusion and the detent are symmetrically formed inside the outer peripheral walls.

5. The electric machine of any of claims 2 to 4, wherein the stator further comprises a first bobbin and a second bobbin, the first bobbin and the second bobbin being fitted to both ends of the stator core.

6. The electric machine of any one of claims 2 to 4, wherein the stator further comprises at least one inlay mounted inside the stator core on one side of the rotor, wherein the inlay limits a rotational angle of the rotor to allow the drive shaft to vibrate within a range.

7. The electric machine of claim 6 wherein the inlay includes a body, at least one buckle, at least two blocks and at least one position limiter, the buckle and each block are formed by extending outward from two opposite surfaces of the body, the position limiter is formed between the blocks, wherein each block is located at one side of the position limiter, and the position limiter is located at one side of the rotor to limit the rotation angle of the rotor.

8. The motor of claim 1, wherein said rotor includes a rotor core, a drive shaft and at least two magnets, said drive shaft passing through said rotor core, said rotor core having at least two mounting slots disposed in a back-to-back arrangement, each of said magnets being mounted in said mounting slots, respectively.

9. The electric machine of claim 8 wherein an outer surface of said magnet facing said inner surface of said stator core is a curved surface, and the air gap between said outer surface of said magnet and said inner surface of said stator core is uniformly distributed.

10. The electric machine of claim 8 wherein an outer surface of said magnet facing said inner surface of said stator core is planar.

11. The electric machine of claim 8, wherein said rotor core includes a fixed portion and at least two mounting portions, each of said mounting portions extending outwardly from each of two sides of said fixed portion, wherein each of said mounting portions includes at least two first sidewalls and at least two second sidewalls symmetrically disposed, an included angle is formed between said first sidewalls and said second sidewalls, and said second sidewalls limit lateral movement of said magnet from said mounting slot to said rotor core.

12. The motor according to claim 1 or 8, wherein the motor further comprises a housing mounted to an outside of the stator, and a cover covered at one end of the housing to enclose the stator.

13. The electric machine of claim 12 further comprising at least one spring mounted to the rotor to resonate with movement of the rotor, wherein the spring deforms upon movement of the rotor to provide a spring back force for the sides of the rotor to return to a centered state.

14. The electric machine of claim 13, wherein the elastic member is coupled to the cover and the driving shaft, respectively, and an extending direction of the elastic member and an extending direction of the cover are the same.

15. The motor of claim 13, wherein the elastic member is coupled to the cover and the driving shaft, respectively, and an extending direction of the elastic member is the same as an extending direction of the driving shaft.

16. The motor as claimed in claim 12, wherein at least two bearings are connected between the housing and the driving shaft, the bearings being respectively provided at both ends of the housing and connected to the driving shaft to support the movement of the driving shaft.

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