CN210297371U - Rotor assembly, motor with rotor assembly and toothbrush - Google Patents

Abstract

The utility model relates to a rotor component, which comprises a magnetic steel and a retainer for fixing the magnetic steel, wherein the retainer is provided with at least two placing grooves which are symmetrical relative to the central axis of the retainer, and each placing groove contains a magnetic steel; the placing groove comprises an opening, a bottom wall arranged opposite to the opening, a first end wall connected with one end of the bottom wall, and a second end wall connected with the other end of the bottom wall, the first end wall and the second end wall are arranged opposite to each other, and the magnetic steel is positioned between the first end wall and the second end wall and faces the opening; backstop portions are formed on the first end wall and the second end wall, the backstop portions are opposite to the surfaces, facing the opening, of the magnetic steel, and the shortest distance between the backstop portions on the first end wall and the backstop portions on the second end wall is smaller than the length, along the directions of the first end wall and the second end wall, of the magnetic steel. The utility model discloses a rotor subassembly can prevent effectively that the magnet steel from deviating from the holder. The utility model discloses still relate to motor and the toothbrush that has this rotor subassembly.

Description

Rotor assembly, motor with rotor assembly and toothbrush

Technical Field

The utility model relates to a drive field, concretely relates to rotor subassembly, motor and toothbrush that have this rotor subassembly.

Background

Electric toothbrushes are increasingly popular among people because of their advantages of time and labor saving, good cleaning effect, etc. In principle, electric toothbrushes include both rotary and vibratory types. The vibrating toothbrush comprises a magnetic suspension vibrating motor which can generate high-frequency swing perpendicular to the brush handle direction so as to brush teeth. A common vibration-type toothbrush motor includes a stator assembly and a rotor assembly disposed in the stator assembly and capable of swinging relative to the stator assembly, wherein the rotor assembly includes a magnetic steel, a holder for fixing the magnetic steel, and a rotating shaft penetrating through the holder. However, after the motor is used for a period of time, the magnetic steel is easy to fall off the retainer due to the high-frequency vibration of the rotating shaft, and the motor fails.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is directed to a rotor assembly, a motor having the rotor assembly, and a toothbrush, which can solve the above problems at least to some extent.

Therefore, the utility model provides a rotor assembly, which comprises a magnetic steel and a retainer for fixing the magnetic steel, wherein the retainer is provided with at least two placing grooves which are symmetrical relative to the central axis of the retainer, and each placing groove contains a magnetic steel; the placing groove comprises an opening, a bottom wall arranged opposite to the opening, a first end wall connected with one end of the bottom wall, and a second end wall connected with the other end of the bottom wall, the first end wall and the second end wall are arranged opposite to each other, and the magnetic steel is positioned between the first end wall and the second end wall and faces the opening; backstop portions are formed on the first end wall and the second end wall, the backstop portions are opposite to the surfaces, facing the opening, of the magnetic steel, and the shortest distance between the backstop portions on the first end wall and the backstop portions on the second end wall is smaller than the length, along the directions of the first end wall and the second end wall, of the magnetic steel.

In some embodiments, the placement groove further includes a first side wall connected to one side of the bottom wall, and a second side wall connected to the other side of the bottom wall, and the first side wall and the second side wall are arranged opposite to each other and both protrude from a surface of the magnetic steel facing the opening.

In some embodiments, the outer surfaces of the first and second end walls and the first and second side walls of the placement groove are arc-shaped, and the outer surfaces of the first and second end walls and the first and second side walls are on the same cylindrical surface.

In some embodiments, the magnetic steel abuts against the bottom wall of the placement groove, and/or the first and second end walls of the placement groove, and/or the first and second side walls of the placement groove.

In some embodiments, the magnetic steel is bonded to the bottom wall of the placement groove, and/or the first and second end walls of the placement groove, and/or the first and second side walls of the placement groove.

In some embodiments, the stopper is made of a material having elasticity.

In some embodiments, the stopper is wedge-shaped, and gradually expands towards the surface of the magnetic steel facing the opening to form a slope.

In some embodiments, the holding frame further comprises a rotating shaft integrally connected with the holding frame in an overmoulded mode, and the at least two placing grooves are symmetrical relative to the rotating shaft.

On the other hand, the utility model also provides a motor, including stator module and the aforementioned rotor subassembly, the rotor subassembly arrange in but stator module internal and relative stator module swing.

In another aspect, the present invention further provides a toothbrush, which comprises a brush head and the motor, wherein the brush head is connected to the rotating shaft of the motor.

The utility model discloses a holder with backstop portion can prevent effectively that the magnet steel from deviating from the holder to improve the life-span of rotor subassembly and motor thereof.

Drawings

Fig. 1 is a perspective view of a motor according to an embodiment of the present invention.

Fig. 2 is a partially exploded view of the motor shown in fig. 1.

Fig. 3 is a longitudinal sectional view of the motor shown in fig. 1.

Fig. 4 is a transverse cross-sectional view of the motor shown in fig. 1.

Fig. 5 is a schematic view of a rotor assembly of the motor shown in fig. 1.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, so that the technical solutions and the advantages thereof will be more clearly understood. It is to be understood that the drawings are provided for purposes of illustration and description only and are not intended as a definition of the limits of the invention, but the dimensions shown in the drawings are for convenience and are not to be taken as limiting the scale.

Referring to fig. 1 to 4, an electric machine 100 according to an embodiment of the present invention includes a stator assembly 10 and a rotor assembly 20 disposed within the stator assembly 10. The stator assembly 10 forms a receiving cavity 11 at the center thereof for receiving the rotor assembly 20, and the rotor assembly 20 can oscillate back and forth relative to the stator assembly 10. The stator assembly 10 includes a housing 12, a stator core 13 fixedly connected to the housing 12, a bobbin 14 covering at least a part of a surface of the stator core 13, and a winding 15 wound around the bobbin 14. The rotor assembly 20 includes a magnetic steel 30, a holder 40 for fixing the magnetic steel 30, and a rotating shaft 50 fixedly connected to the holder 40. The motor 100 of the present embodiment includes two stator cores 13 symmetrically disposed on two sides of the rotating shaft 50, two sets of windings 15, and two pieces of magnetic steel 30. Each magnetic steel 30 corresponds to a stator core 13 and a winding 15. Each magnet 30 comprises two opposite poles (N-pole, S-pole as shown in fig. 4). Preferably, the magnetic steel 30 is formed by magnetizing a neodymium iron boron magnet. According to the principle that like poles repel each other and opposite poles attract each other, after the winding 15 is charged with alternating current, the magnetic steel 30 generates forward and reverse reciprocating swing under the action of magnetic force, so as to drive the holder 40 to swing, and finally, the swing is output to a load through the rotating shaft 50 fixedly connected with the holder 40. It is understood that in other embodiments, the rotor assembly 20 may include other numbers of magnetic steels 30, such as four pieces, eight pieces, etc., as desired, and the number of stator cores 13 and windings 15 may be adjusted accordingly.

As shown in fig. 2, 4 and 5, in the present embodiment, the holder 40 includes a substantially cylindrical body portion 41. The main body 41 is formed with a through hole 42 located at the center of the main body 41 and two placement grooves 43 symmetrically distributed on both sides of the through hole 42. A placement groove 43 receives a magnetic steel 30. The rotating shaft 50 penetrates through the through hole 42 and is fixedly connected with the hole wall of the through hole 42. The placement groove 43 includes an opening 430, a bottom wall 431 disposed opposite to the opening 430, and a first end wall 432 and a second end wall 433 connected to both ends of the bottom wall 431. The magnetic steel 30 may abut against the bottom wall 431 of the placement groove 43. Preferably, the magnetic steel 30 is fixed to the bottom wall 431 of the placement groove 43 by bonding, for example, with anaerobic adhesive. The first 432 and second 433 end walls of the placement groove 43 protrude from the surface 31 of the magnetic steel 30 facing the opening 430. In this embodiment, the protruding portions of the first end wall 432 and the second end wall 433 of the placement groove 43 form a stopping portion 44, respectively, and the shortest distance between the stopping portions 44 on the first end wall 432 and the second end wall 433 is smaller than the length of the magnetic steel 30 along the direction of the first end wall 432 and the second end wall 433, so that the magnetic steel 30 is effectively prevented from falling off from the holder 40 along the radial direction. The magnetic steel 30 can also abut against the first and second end walls 432, 433 of the placement groove 43, for example, by a tight fit or an adhesive bonding manner, so as to prevent the magnetic steel 30 from loosening in the axial direction during the swinging of the rotating shaft 50.

In this embodiment, the placement groove 43 further includes a first side wall 434 and a second side wall 435 connected to both sides of the bottom wall 431 thereof. Preferably, the first and second side walls 434, 435 protrude from the surface 31 of the magnetic steel 30 facing the opening 430 to protect the magnetic steel 30. Preferably, the magnetic steel 30 is also abutted against the first and second side walls 434 and 435 of the placement groove 43, for example, by a tight fit or an adhesive, so as to prevent the magnetic steel 30 from loosening in the circumferential direction during the swinging of the rotating shaft 50. The first and second end walls 432 and 433 and the first and second side walls 434 and 435 of the placement groove 43 abut against the magnetic steel 30, and it can be further ensured that the center position of the magnetic steel 30 is aligned with the center position of the rotating shaft 50, so that the magnetic symmetry of two different magnetic poles in each magnetic steel 30 is ensured, and the rotating shaft 50 swings more stably and uniformly. Moreover, the blocking effect of the blocking portion 44 on the magnetic steel 30, and the abutting effect of the first and second end walls 432, 433 and the first and second side walls 434, 435 of the placing groove 43 on the magnetic steel 30 can be utilized to reduce the amount of glue and reduce the cost.

As shown in fig. 4 and 5, the outer surfaces of the first and second end walls 432 and 433 and the first and second side walls 434 and 435 of the placement groove 43 in this embodiment are arc-shaped, and the outer surfaces of the first and second end walls 432 and 433 and the first and second side walls 434 and 435 are on the same cylindrical surface, wherein a certain air gap 436 is formed between the cylindrical surface and the stator core 13. Such a configuration is compact while ensuring stable oscillation of the rotor assembly 20 at a certain oscillation angle without interference.

Preferably, the stopper 44 is made of a material having elasticity, such as plastic, so that the magnetic steel 30 is pressed into the placement groove 43 by the deformation of the stopper 44. Preferably, the stop 44 has a wedge shape, which gradually expands towards the surface 31 of the magnetic steel 30 facing the opening 430 and forms a slope 440. The distance between the vertexes of the inclined surfaces 440 on the first and second end walls 432, 433 is smaller than the length of the magnetic steel 30 in the direction of the first and second end walls 432, 433. During the assembly, can press in the standing groove 43 with the help of this inclined plane 440 with magnet steel 30 more easily, fast, the simple operation. Preferably, the retainer 40 is integrally connected with the rotating shaft 50 in an overmolding manner by using plastic, so as to improve the bonding force between the retainer and the rotating shaft, and avoid physical damage caused by assembling the rotating shaft 50 to the retainer 40, and the product consistency is good.

Preferably, the cage 40 further includes first and second connection portions 45 and 46 respectively disposed at both axial ends of the body portion 41. The rotation shaft 50 sequentially penetrates the first connection portion 45, the body portion 41, and the second connection portion 46 to improve the strength of the rotation shaft 50. A plurality of ribs 450 and 460 may be connected between the first and second connecting portions 45 and 46 and the axial end portion of the main body portion 41, and the plurality of ribs 450 and 460 are preferably uniformly distributed in the circumferential direction. In this embodiment, the ribs 450 and 460 have an inclined surface disposed at an acute angle with respect to the axial end of the main body portion 41, one end of the inclined surface is connected to the axial end of the main body portion 41, and the other end of the inclined surface is connected to the sidewall of the first connecting portion 45 or the second connecting portion 46.

As shown in fig. 2 and 3, the motor 100 of the present embodiment further includes a base 60 connected to one end of the rotating shaft 50 and an output shaft 70 connected to the other end of the rotating shaft 50. The base 60 is fixedly connected to the housing 12, and the center of the base 60 and the portion of the rotating shaft 50 protruding from the first connecting portion 45 are connected by a bearing 600. The output shaft 70 is tightly fitted to a portion of the rotating shaft 50 protruding from the second connecting portion 46, and further swings synchronously with the rotating shaft 50. The output shaft 70 is coupled to the housing 12 by another bearing 700. The motor 100 of this embodiment can be applied to an electric toothbrush, and when it is installed, the brush head is connected to the output shaft 70 of the motor 100 of this embodiment.

The above description is only a preferred embodiment of the present invention, the protection scope of the present invention is not limited to the above listed embodiments, any person skilled in the art can obviously obtain simple changes or equivalent substitutions of the technical solutions within the technical scope of the present invention.

Claims (10)

1. A rotor assembly comprises magnetic steel and a retainer for fixing the magnetic steel, and is characterized in that the retainer is provided with at least two placing grooves which are symmetrical relative to the central axis of the retainer, and each placing groove contains one magnetic steel; the placing groove comprises an opening, a bottom wall arranged opposite to the opening, a first end wall connected with one end of the bottom wall, and a second end wall connected with the other end of the bottom wall, the first end wall and the second end wall are arranged opposite to each other, and the magnetic steel is positioned between the first end wall and the second end wall and faces the opening; backstop portions are formed on the first end wall and the second end wall, the backstop portions are opposite to the surfaces, facing the opening, of the magnetic steel, and the shortest distance between the backstop portions on the first end wall and the backstop portions on the second end wall is smaller than the length, along the directions of the first end wall and the second end wall, of the magnetic steel.

2. The rotor assembly of claim 1, wherein the placement slot further comprises a first sidewall connected to one side of the bottom wall and a second sidewall connected to the other side of the bottom wall, the first sidewall and the second sidewall being oppositely disposed and each protruding from a surface of the magnetic steel facing the opening.

3. The rotor assembly of claim 2 wherein the outer surfaces of the first and second end walls and the first and second side walls of the placement slot are curved, and the outer surfaces of the first and second end walls and the first and second side walls are on the same cylindrical surface.

4. The rotor assembly of claim 2, wherein the magnetic steel abuts against the bottom wall of the placement slot, and/or the first and second end walls of the placement slot, and/or the first and second side walls of the placement slot.

5. The rotor assembly of claim 4, wherein the magnetic steel is bonded to the bottom wall of the placement slot, and/or the first and second end walls of the placement slot, and/or the first and second side walls of the placement slot.

6. The rotor assembly of claim 1 wherein the stop is made of a material having elasticity.

7. The rotor assembly of claim 6, wherein the stopper is wedge-shaped, gradually expanding toward the surface of the magnetic steel facing the opening and forming a slope.

8. The rotor assembly of claim 1, further comprising a rotating shaft integrally connected with the retainer in an over-molding manner, wherein the at least two placement grooves are symmetrical with respect to the rotating shaft.

9. An electric machine comprising a stator assembly and a rotor assembly according to any of claims 1-8, the rotor assembly being arranged within and oscillatable relative to the stator assembly.

10. A toothbrush comprising a brushhead and a motor according to claim 9, the brushhead being connected to the shaft of the motor.

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