CN210092993U

CN210092993U - Motor for electric toothbrush and electric toothbrush

Info

Publication number: CN210092993U
Application number: CN201921442557.5U
Authority: CN
Inventors: 丁佐建; 蒋婷觅; 郭凡美
Original assignee: Shanghai Xiangfang Technology Co Ltd
Current assignee: Nantong Xiangfang Electromechanical Technology Co ltd
Priority date: 2019-08-31
Filing date: 2019-08-31
Publication date: 2020-02-18
Anticipated expiration: 2029-08-31

Abstract

The utility model provides a motor for electric toothbrush, and electric toothbrush, motor for electric toothbrush includes the shell, at least a pair of stator core of fixing in the shell, around establishing on each stator core and the coil winding of fixing in the shell, with each stator core matched with magnetism part, and rotationally install the motor shaft in the shell, every magnetism part all is bipolar, a plurality of magnetism parts are arranged along the circumference of motor shaft, and have first space between two adjacent magnetism parts, the motor shaft is made by magnetic conductive material, magnetism part snap-on is in the periphery of motor shaft. The rotor core among the prior art has been cancelled in this application, and it has reduced a part, saves the cost, especially can leave more spaces for the magnetism part, and the motor shaft still plays the effect of magnetic conduction in this application simultaneously, and it is bigger for former rotor core, and the magnetic conduction effect is better to promote the performance of motor for electric toothbrush greatly.

Description

Motor for electric toothbrush and electric toothbrush

Technical Field

The utility model relates to a motor for an electric toothbrush.

The utility model also relates to an electric toothbrush comprising the motor for the electric toothbrush.

Background

The electric toothbrush mainly comprises a motor (namely a motor) and a brush head, wherein the brush head generates high-frequency vibration through the rapid operation of the motor, so that toothpaste is instantly decomposed into fine foam to deeply clean teeth gaps; meanwhile, the vibration of the brush hair on the brush head can promote the blood circulation in the oral cavity, and has a certain massage effect on the gum tissue. Thus, the motor is a major component of the electric toothbrush. The requirements of the current electric toothbrush on the motor are as follows: the center of the motor shaft can swing left and right at a very high frequency (200 and 400Hz) and a small angle (not more than +/-15 degrees), so that the brush head is driven to swing fast to clean teeth. The motor for the electric toothbrush needs a driving force alternating left and right and a restoring force for restoring the center so as to be able to swing left and right.

In the motor for the electric toothbrush in the prior art, magnetic steel and a coil are generally adopted to interact to generate a left-right alternating driving force, and alternating driving force can be generated by introducing alternating current into the coil; most of the restoring force is provided by the spring, but the structure is easy to damage and not easy to repair, so that the service life of the motor for the electric toothbrush is short. Based on this, a motor for an electric toothbrush is provided in the market, which generates a restoring force by magnetic interaction between magnetic steel and a stator core, and the magnetic force action has no mechanical loss, and has a significant advantage over a motor using a spring to provide the restoring force.

Further, chinese utility model patent application No. 201720272757.5 discloses a motor device that electric toothbrush used, it has stator core, around establishing coil winding on stator core, with stator core matched with magnet steel structure, shaft coupling (be rotor core) and motor shaft, wherein, magnet steel structure fixed connection is in the periphery of shaft coupling, fixed connection is in the periphery of motor shaft again in the shaft coupling, it produces restoring force by the magnetic interaction between magnet steel and the stator core. However, the above motor apparatus has the following drawbacks: 1. the stator core and the shell are of an integrated structure, namely two poles of the stator core are of an integrated structure and are connected through the shell, and the shell positioned on the outer ring of the stator core has the minimum wall thickness due to the processing limit, and the minimum wall thickness is unnecessary from the perspective of magnetic conductivity, so that the space occupied by the coil winding is reduced, the number of turns of the coil winding is limited, and the performance of a motor device, especially a motor with a smaller size, is reduced; 2. the magnetic steel is connected with the motor shaft through the rotor core, the rotor core can occupy a certain space, so that the occupied space of the magnetic steel is relatively reduced, the size of the rotor core can not be larger, and the performance of the motor device is further reduced.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned shortcomings of the prior art, it is an object of the present invention to provide a motor for an electric toothbrush, which can improve the performance of the motor and reduce the cost of the motor.

In order to achieve the above object, the present invention provides a motor for electric toothbrush, including shell, at least a pair of stator core fixed in the shell, around establishing on each stator core and fixed in the shell coil winding, with each stator core matched with magnetism part and rotationally install the motor shaft in the shell, every magnetism part all is bipolar, a plurality of magnetism parts arrange along the circumference of motor shaft, and have first space between two adjacent magnetism parts, the motor shaft is made by magnetic conductive material, magnetism part snap-on is in the periphery of motor shaft.

Furthermore, each magnetic component comprises two magnetic steels with different polarities, the two magnetic steels forming each magnetic component are arranged in a manner of abutting against each other along the circumferential direction of the motor shaft and extend along the axial direction of the motor shaft, and the magnetic steels are directly fixed on the periphery of the motor shaft.

Further, motor for electric toothbrush still includes the stator support of fixing in the shell, all be split type structure between shell and the stator core and between a plurality of stator core, a stator support has all been strideed between two adjacent stator cores, is formed with the second space between two adjacent stator supports, stator core includes that the cross-section is the iron core main part of arc section form and follows the outside convex iron core convex part in the periphery of iron core main part, the magnetic part sets up the internal periphery at the iron core main part, the coil winding laminating has the coil groove just to setting up with the second space on stator support's the surface and in the coil winding, the iron core convex part is arranged in second space and coil groove.

Further, the motor for the electric toothbrush further comprises a rotor bracket fixed on the motor shaft, wherein the rotor bracket is provided with an installation limiting part extending along the axial direction of the motor shaft, and the installation limiting part is positioned in the first gap and abutted against the side face of the magnetic part.

Furthermore, the rotor support is further provided with a limiting protruding part protruding along the radial direction of the motor shaft, a limiting groove is formed in the stator support, and the limiting protruding part is located in the limiting groove and can be abutted against the groove wall of the limiting groove.

Further, the shell comprises a cylindrical shell, a front cover and a rear cover, wherein the front cover and the rear cover are fixed at the front end and the rear end of the shell respectively, the motor shaft is rotatably supported in the front cover and the rear cover through a bearing, the rear end of the motor shaft extends out of the rear cover backwards, and the stator core and the coil winding are fixed in the shell.

The application also provides an electric toothbrush, including brush head and as above the motor for electric toothbrush, brush head is fixed on the motor shaft of motor for electric toothbrush.

As described above, the motor for an electric toothbrush and the electric toothbrush according to the present invention have the following advantageous effects:

the motor shaft has the advantages that a rotor core in the prior art is omitted, the magnetic part is directly fixed on the periphery of the motor shaft made of the magnetic conductive material, one part is reduced, cost is saved, more space can be reserved for the magnetic part, and the motor shaft plays a role of magnetic conduction at the same time in the application, is larger in size and better in magnetic conduction effect compared with an original rotor core; therefore, the volume of the parts (namely the magnetic part and the motor shaft) which play a role of magnetic conduction can be relatively increased, so that the performance of the motor for the electric toothbrush is greatly improved.

Drawings

Fig. 1 is a schematic view showing a structure of a motor for an electric toothbrush according to the present application.

Fig. 2 is a schematic structural view of fig. 1 without a shell in the housing.

Fig. 3 is a sectional view of fig. 1 taken along the axial direction of the motor shaft.

Fig. 4 is a cross-sectional view of fig. 1 taken along a radial direction of a motor shaft.

Fig. 5 is a schematic view of connections between the stator core, the stator frame and the coil windings of fig. 4.

Fig. 6 is a schematic view of the connection between the motor shaft, the magnetic member, the stator core and the rotor bracket in the present application.

Fig. 7 is a schematic structural diagram of a stator core according to the present application.

Fig. 8 and 9 are schematic structural diagrams of the stator support in the present application at different viewing angles.

Fig. 10 is a schematic view of the structure of a rotor support in the present application.

Description of the element reference numerals

1 Motor shaft

2 outer cover

21 casing

22 front cover

23 rear cover

3 stator core

31 core body

32 core protrusions

4 coil winding

41 coil slot

5 magnetic component

51 magnetic steel

6 first gap

7 stator support

71 limiting groove

72 card slot

73 mating flats

8 second gap

9 rotor support

91 mounting limiting part

92 limit protrusion part

10 bearing

11 welding seam

Detailed Description

The following description is provided for illustrative purposes, and other advantages and features of the present invention will become apparent to those skilled in the art from the following detailed description.

It should be understood that the drawings of the present application are only used to match the contents disclosed in the specification, so as to be known and read by those skilled in the art, and not to limit the practical limitations of the present invention, so that the present application does not have any technical significance, and any modification of the structure, change of the ratio relationship, or adjustment of the size should still fall within the scope of the present application without affecting the function and the achievable purpose of the present application. Meanwhile, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and changes or adjustments of the relative relationship thereof are considered as the scope of the present invention without substantial changes in the technical content.

The application provides an electric toothbrush, comprising a brush head and a motor for the electric toothbrush; as shown in fig. 1, the motor for the electric toothbrush has a motor shaft 1 capable of swinging left and right, and the brush head is fixed to the motor shaft 1 of the motor for the electric toothbrush, so that the motor for the electric toothbrush drives the brush head to swing rapidly. For convenience of description, in the following embodiments, the axial direction of the motor shaft 1 in the motor for the electric toothbrush is defined as the front-rear direction.

As shown in fig. 1 to 4 and fig. 6, the motor for an electric toothbrush according to the present invention includes a housing 2, at least one pair of stator cores 3 fixed in the housing 2, a coil winding 4 wound around each stator core 3 and fixed in the housing 2, magnetic members 5 engaged with each stator core 3, and a motor shaft 1 rotatably installed in the housing 2, each magnetic member 5 being bipolar and having N and S poles, the plurality of magnetic members 5 being arranged in a circumferential direction of the motor shaft 1 with a first gap 6 between adjacent two magnetic members 5; specifically, the motor shaft 1 is made of a magnetically conductive material, and the magnetic member 5 is directly fixed to the outer periphery of the motor shaft 1.

In the motor for the electric toothbrush, alternating current is introduced into the coil winding 4, a magnetic field is formed at the stator iron core 3, and the magnetic part 5 and the motor shaft 1 are driven to rotate. This application passes through electromagnetic structure transmission power, makes motor for electric toothbrush have drive power and the restoring force of left and right sides alternation to realize motor shaft 1 and reciprocate about an angular range. In particular, the rotor core in the prior art is eliminated in the present application, and the magnetic component 5 is directly fixed on the periphery of the motor shaft 1 made of the magnetic conductive material, which reduces one part and saves the cost; meanwhile, the matching characteristic of the motor shaft 1 and a rotor core can be eliminated, and the processing cost of the motor shaft 1 is reduced; more space can be reserved for the magnetic part 5, and the motor shaft 1 plays a role of magnetic conduction in the application, namely the motor shaft 1 is also the magnetic part 5 at the same time, and the size is larger and the magnetic conduction effect is better compared with the original rotor core; therefore, the present application can relatively increase the volume of the parts (i.e., the magnetic part 5 and the motor shaft 1) having the magnetic conductive function, thereby greatly improving the performance of the motor for the electric toothbrush. In addition, the electromagnetic structure is adopted to provide the restoring force required by the motor for the electric toothbrush, so that magnetic suspension is realized; meanwhile, the swing frequency of the motor shaft 1 of the motor for the electric toothbrush in the application can reach 200-400Hz, and the range of sound waves is reached. Therefore, the motor for the electric toothbrush related to the present application may also be referred to as a magnetic levitation acoustic wave motor.

As shown in fig. 1 to 3, the housing 2 includes a cylindrical housing 21, and a front cover 22 and a rear cover 23 fixed to front and rear ends of the housing 21, respectively, the motor shaft 1 is rotatably supported in the front cover 22 and the rear cover 23 by a bearing 10, a rear end of the motor shaft 1 protrudes rearward from the rear cover 23, and the stator core 3 and the coil winding 4 are fixed in the housing 21. The shape of the housing 21 may be varied, such as cylindrical, square barrel, etc., so that the housing 2 has a variety of different shapes.

The motor for the electric toothbrush has at least one pair of stator cores 3, and each pair of stator cores 3 has two stator cores 3, so that the number of the magnetic members 5 is even. The magnetic part 5 can be a bipolar magnetized integral part or two magnetic steels 51 with opposite polarities and close to each other. Preferably, in the present application, as shown in fig. 4 and 6, each magnetic component 5 includes two magnetic steels 51 with different polarities, so that there are even pairs of magnetic steels 51; in each pair of magnetic steels 51, one magnetic steel 51 has an N-pole polarity, and the other magnetic steel 51 has an S-pole polarity; the two magnetic steels 51 forming each magnetic part 5 are close together along the circumferential direction of the motor shaft 1, and the radial direction of the magnetizing direction is; each magnetic steel 51 extends in the axial direction of the motor shaft 1; the magnetic steel 51 is directly fixed to the outer periphery of the motor shaft 1. In this application, the motor for the electric toothbrush has a pair of stator cores 3, so stator cores 3 have 2, and magnet steel 51 has 4.

Further, a split structure is arranged between the shell 21 and the stator cores 3, and a split structure is also arranged between each pair of the stator cores 3, so that the coil winding 4 which is independently wound can be adopted, and the winding cost is reduced. The coil winding 4 is insulated from the stator core 3; based on this, as shown in fig. 2 to 7, the motor for the electric toothbrush further includes stator supports 7 fixed in the housing 21, and one stator support 7 spans between two adjacent stator cores 3, so that there are 2 stator supports 7; a second gap 8 is formed between every two adjacent stator supports 7; the stator core 3 is substantially Y-shaped, and includes a core main body 31 having a circular arc-shaped cross section, and a core protrusion 32 protruding outward from the outer periphery of the core main body 31; the magnetic member 5 is provided on the inner periphery of the core body 31, the coil winding 4 is attached to the outer surface of the stator frame 7, the coil winding 4 has a coil groove 41 provided to face the second gap 8, and the core protrusion 32 is positioned in the second gap 8 and the coil groove 41. The coil windings 4 are thus insulated from the stator core 3 by a stator support 7, the stator support 7 being made of an insulating material, such as plastic, the stator support 7 preferably being an injection-molded part. In this application, adopt split type structure between shell 2 and the stator core 3, also be split type structure between every to two stator core 3, this structure breaks through the stator core 3 of integral type structure among the prior art to the restriction of its outer lane minimum wall thickness, so this application can reduce the wall thickness of 3 outer lane shells 2 of stator core, give unnecessary wall thickness space to coil winding 4, this application can increase substantially coil winding 4's effective ampere of turns under the prerequisite of the same appearance volume of motor, from this performance of increasing substantially the motor, especially to the motor of less size.

Preferably, as shown in fig. 4 and 5, and fig. 8 and 9, the outer surface of the stator frame 7 that is fitted with the coil winding 4 is a fitting plane 73; meanwhile, the flat coil of the coil winding 4 is not required to be wound on the stator core 3, so that the winding is simple and the whole is arranged, the number of turns of the coil winding 4 can be increased by the shell 21 with the same volume, the performance of the motor is improved, and the winding cost is reduced. In addition, the stator core 3 omits an outer ring connecting ring, and more volume can be provided for the coil winding 4. The coil winding 4 is bonded to the stator support 7 made of plastic, does not contact the stator core 3, and improves the insulation performance. The stator support 7 is inserted into the housing 21, and glue is injected between the stator support and the housing for bonding and fixing.

Further, the performance of the motor is a key index parameter of the motor, which means that 1W electric power can be converted into a large force, and the actual measurement proves that: on the premise of the same size and volume (14x11x37), in the motor related to the application, a split structure is adopted between the shell 2 and the stator cores 3, a split structure is also adopted between each pair of two stator cores 3, and then the magnetic component 5 is directly fixed on the periphery of the motor shaft 1 made of magnetic conductive materials, so that the structure can enable the electric power of the motor 1W to be converted into about 8 forces, while the electric power of the motor 1W adopting the rotor core in the prior art can be converted into about 5.2 forces; obviously, the motor performance can be improved by 50% by the aid of the motor, and the output force can be improved by 50% under the same volume and power.

Further, as shown in fig. 6 and 10, the motor for an electric toothbrush further includes a rotor holder 9 fixed to the motor shaft 1, the rotor holder 9 has an installation restricting portion 91 extending in the axial direction of the motor shaft 1, and the installation restricting portion 91 is located in the first gap 6 and abuts against the side surface of the magnetic member 5. Therefore, an installation area is formed between two adjacent installation limiting parts 91 in the rotor bracket 9, and the magnetic steel 51 is directly assembled in the installation area, so that the magnetic steel 51 is convenient to install; under the restriction of the mounting stopper 91 of the rotor holder 9, the magnetic steel 51 cannot move freely in the circumferential direction, and functions as a stopper. As shown in fig. 2, 6, 8 and 10, the rotor holder 9 is further provided with a limit projection 92 projecting in the radial direction of the motor shaft 1, the stator holder 7 is provided with a limit groove 71, and the limit projection 92 is positioned in the limit groove 71 and can abut against the groove wall of the limit groove 71; in the operation process of the motor, the rotor bracket 9 swings back and forth left and right along with the motor shaft 1, and the swing amplitude of the rotor bracket 9 can be limited through the matching of the limiting groove 71 and the limiting protrusion 92, so that the swing amplitude of the motor shaft 1 is limited, namely the maximum rotation angle of the motor shaft 1 during swinging is limited.

Further, since the stator core 3 and the housing 21 are of a split structure, the stator core 3 must be reliably fixed relative to the housing 21. Based on this, the stator core 3 can be reliably fixed to the housing 21 by one or a combination of the following means: in the first method, laser welding is performed between the core protrusion 32 of the stator core 3 and the housing 21, and a weld 11 is formed at the weld, as shown in fig. 4; in the second mode, the core main body part 31 of the stator core 3 is bonded to the coil winding 4, and the core main body part 31 of the stator core 3 is bonded to the stator support 7; in the third embodiment, as shown in fig. 5 and 9, the inner peripheral surface of the stator holder 7 is provided with the engaging groove 72 that engages with the core body 31, and both side edges of the core body 31 engage with the engaging groove 72 of the stator holder 7, thereby achieving fixation by its own structure.

To sum up, the utility model discloses various shortcomings in the prior art have effectively been overcome and high industry value has.

The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Modifications and variations can be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.

Claims

1. The utility model provides a motor for electric toothbrush, including shell (2), at least a pair of stator core (3) of fixing in shell (2), around establishing on each stator core (3) and fixing coil winding (4) in shell (2), with each stator core (3) matched with magnetism part (5), and motor shaft (1) rotationally installed in shell (2), every magnetism part (5) all are bipolar, a plurality of magnetism parts (5) are arranged along the circumference of motor shaft (1), and have first space (6) between two adjacent magnetism parts (5), its characterized in that: the motor shaft (1) is made of a magnetic conductive material, and the magnetic part (5) is directly fixed on the periphery of the motor shaft (1).

2. The motor for an electric toothbrush according to claim 1, wherein: every magnetic part (5) all includes two different magnet steel (51) of polarity, and two magnet steel (51) that constitute every magnetic part (5) are along the circumference of motor shaft (1) near setting, and all extend along the axial of motor shaft (1), magnet steel (51) snap-on is in the periphery of motor shaft (1).

3. The motor for an electric toothbrush according to claim 1, wherein: the stator structure is characterized by further comprising stator supports (7) fixed in the shell (2), split structures are arranged between the shell (2) and the stator cores (3) and between the plurality of stator cores (3), one stator support (7) is arranged between every two adjacent stator cores (3) in a spanning mode, a second gap (8) is formed between every two adjacent stator supports (7), the stator core (3) comprises a core main body part (31) with a section in a circular arc section shape and a core convex part (32) which is protruded outwards from the periphery of the core main body part (31), the magnetic component (5) is arranged on the inner periphery of the iron core main body part (31), the coil winding (4) is attached to the outer surface of the stator support (7), a coil slot (41) which is opposite to the second gap (8) is arranged in the coil winding (4), the core protrusions (32) are located in the second air gap (8) and the coil slots (41).

4. The motor for an electric toothbrush according to claim 3, wherein: the motor is characterized by further comprising a rotor support (9) fixed on the motor shaft (1), wherein an installation limiting part (91) extending along the axial direction of the motor shaft (1) is arranged on the rotor support (9), and the installation limiting part (91) is located in the first gap (6) and is abutted to the side face of the magnetic component (5).

5. The motor for an electric toothbrush according to claim 4, wherein: the rotor support (9) is further provided with a limiting protruding portion (92) protruding along the radial direction of the motor shaft (1), a limiting groove (71) is formed in the stator support (7), and the limiting protruding portion (92) is located in the limiting groove (71) and can be abutted to the groove wall of the limiting groove (71).

6. The motor for an electric toothbrush according to claim 1, wherein: the motor is characterized in that the shell (2) comprises a cylindrical shell (21), a front cover (22) and a rear cover (23) which are fixed to the front end and the rear end of the shell (21) respectively, the motor shaft (1) is rotatably supported in the front cover (22) and the rear cover (23) through a bearing (10), the rear end of the motor shaft (1) extends out of the rear cover (23) backwards, and the stator core (3) and the coil winding (4) are fixed in the shell (21).

7. An electric toothbrush, including brush head, its characterized in that: further comprising a motor for an electric toothbrush according to any of claims 1 to 6, the brush head being fixed to a motor shaft (1) of the motor for an electric toothbrush.