WO2020006820A1

WO2020006820A1 - Motor

Info

Publication number: WO2020006820A1
Application number: PCT/CN2018/101336
Authority: WO
Inventors: 郭志焱; 李军; 兰德福
Original assignee: 宝龙电子集团有限公司
Priority date: 2018-07-03
Filing date: 2018-08-20
Publication date: 2020-01-09
Also published as: CN108551215A

Abstract

Disclosed in the present invention is a motor, comprising a stator assembly and a rotor assembly. The rotor assembly comprises a rotary shaft and a rotor core. The rotor core is connected to the rotary shaft. The rotary shaft is provided with a support bearing. The stator assembly comprises a support, a stator core, and a coil. A rotor cavity for accommodating the rotor core is formed in the support. The rotary shaft is inserted in the rotor cavity. The support is provided with a stator coil slot. The support is provided with a mounting recess communicated with the rotor cavity. The stator core is inserted in the mounting recess and arranged close to the rotor core. The position of stator core corresponding to the support bearing is provided with a mounting platform matching the support bearing. The rotary shaft forms rotational fit with the support by means of fitting between the support bearing and the mounting platform. The coil is wound on the stator coil slot to form a wrap for the stator core. The motor has a simple structure, is easy to assemble, and has a longer service life.

Description

motor

Technical field

The invention relates to the technical field of motors, in particular to a motor suitable for an electric toothbrush.

Background technique

Electric toothbrushes are new products that have appeared in recent years, and have revolutionized the field of oral health in foreign countries. Although the application of electric toothbrushes in our country is not yet widespread, with the improvement of people's awareness, electric toothbrushes will become an important member of public health products. Surveys show that electric toothbrushes are more scientific and effective than ordinary toothbrushes. It can more thoroughly remove plaque, reduce gingivitis and gum bleeding. The electric toothbrush rotates quickly through the motor's output shaft, causing the brush head to vibrate at high frequency, which instantly breaks down the toothpaste into fine foam and deeply cleans the teeth. The electric motor of an electric toothbrush usually uses an alternating current motor to achieve the left-right swing of the electric toothbrush head to achieve the purpose of cleaning the teeth. However, the existing electric toothbrush motor usually includes a stator component, a casing and a rotor component, and the rotor component includes a rotating shaft. It is fixedly connected to the rotor core, the rotor core and the rotating shaft. A bearing is provided on the rotating shaft. The rotating shaft is combined with the housing through the bearing to realize the reciprocating rotation of the rotating shaft. However, the housing is usually made of plastic material for the purpose of insulation. When it comes into contact with the plastic case, a large torque will be generated during work. For a long time, the plastic case will be deformed, and the overall structure will be damaged, which will affect the service life of the entire motor.

Chinese patent patent number is 201710165611.5, "An electric toothbrush and its motor assembly" discloses a motor assembly, which includes a motor casing and at least a 2-pole stator core fixedly installed in the stator casing, and the stator core is wound around the stator core. There are coil windings, including an insulated wire frame for insulating the stator core and the coil windings, and at least two pairs of pole magnetic steel structures matched with the stator core. The magnetic steel structures are fixedly connected to the outer periphery of the shaft coupling, the shaft The motor shaft is fixedly connected to reduce the output of the entire motor to reduce the output force, reduce the pressure on the housing by the bearing, and cancel the elastic structure such as the torsion bar to extend the service life. This structure is practical in certain applications. After time, it will still cause great damage to the shell, deform the plastic shell, and affect the service life. At the same time, the structure is more complicated and the assembly is complicated.

technical problem

In view of the shortcomings of the prior art, the present invention provides a motor which has a simple structure, is easy to assemble, and has a longer practical life.

Technical solutions

The invention provides a motor, which includes a stator assembly and a rotor assembly, the rotor assembly includes a rotating shaft and a rotor core, the rotor core is connected to the rotating shaft, a supporting bearing is provided on the rotating shaft, and the stator assembly includes a bracket, A stator core and a coil, the bracket is formed with a rotor cavity for accommodating the rotor core, the rotating shaft is inserted in the rotor cavity, the bracket is provided with a stator coil slot, and the bracket is provided with a rotor A cavity-connected mounting slot, the stator core is inserted in the mounting slot and is disposed close to the rotor core, and the stator core is provided with a supporting table corresponding to the supporting bearing at a position corresponding to the supporting bearing, and the rotating shaft is connected with the supporting bearing through the supporting bearing. The fitting of the mounting table forms a rotating fit with the bracket, and the coil is wound and arranged in the stator coil slot to form a wrap around the stator core.

Beneficial effect

The beneficial effect of this arrangement is that: using the above scheme, the motor includes a rotor assembly and a stator assembly, the rotor assembly includes a rotor core and a rotating shaft, and the stator assembly includes a stator core, a bracket, and a coil. Convenient and fast, the stator structure is formed by inserting and fixing the stator core and the bracket. At the same time, the brackets are combined with each other to form a rotor cavity for the rotor assembly. The rotor assembly can be installed in the rotor cavity to complete the assembly of the motor. The structure is simple and the operation is simple. Convenient, easy to realize, improve production and processing efficiency, and further form a bearing mounting table on the stator core, so that the rotating shaft on the rotor assembly is connected to the stator core through the bearing. In the prior art, the bracket is usually directly contacted, and the bracket is usually The plastic material is used to achieve the purpose of insulation. However, due to the contact between the bearing and the plastic case, a large torque will be generated during work. The plastic case will be deformed for a long time, which will cause the overall structure to be damaged and contact the stator core. The stator core has better strength than the plastic case, and is less prone to deformation. Life of the product. The bracket material here should be made of insulating materials. In terms of structure, the upper and lower layers are preferred to facilitate installation. Of course, a multi-lobed structure can also be used. For structural stability, the rotor cavity can be assembled and completed. After the rotor is installed, the support structure is integrated using processes such as welding and local melting. The stator iron core is arranged close to the rotor iron core, that is, the two are close to each other, but do not touch each other, which is conducive to the rotation of the rotor iron core. The stator iron core can be multiple, of course, it can also be one, as long as the coil can be placed at the stator iron core. The formation of a magnetic circuit can be performed by absorbing or repelling magnetic parts on the rotor core to cause deflection of the rotating shaft. Under the change of the direction of the coil circuit, adsorption or repelling can be achieved, and the left and right deflection of the rotating shaft can be achieved. The two stator iron cores are wound with coils on both stator iron cores to generate magnetic flux to realize the transmission of the rotor core. Of course, the windings are isolated by the bracket, which can generate greater deflection force, and meanwhile the left and right deflection angles are also More stable and better use.

The invention further provides that a reciprocating groove is provided on an end surface of the stator core facing the rotor core, and the reciprocating groove is provided along the length direction of the stator core.

The beneficial effect of this arrangement is that: using the above scheme, the reciprocating groove is provided, and the reluctance torque is increased, so that the magnetic information is minimized at the corresponding position of the reciprocating groove, and the relative stability of the left and right amplitude of the rotor is ensured during the AC reciprocating process.

The present invention further provides that the bracket is arranged in an upper and lower structure, the bracket includes a symmetrical upper bracket and a lower bracket, the upper bracket and the lower bracket are combined to form a rotor cavity, and the upper bracket and the lower bracket are both plugged in A stator core is fitted, and the rotor core is disposed between the two stator cores and cooperates with the stator core gap.

The beneficial effect of such a setting is: adopting the above scheme, so that the bracket structure is set up, which is easier to assemble and replace and maintain. It only needs to wind the coil in the stator coil winding slot on the bracket, and then insert the stator iron core. With magnetic parts, the rotor core will be adsorbed on the stator core to form the preliminary positioning of the position, and then the two brackets are assembled with each other to complete the preliminary installation, which is convenient to install and improves production efficiency.

The invention is further provided that the stator core extends to the outside of the installation slot to form an extension edge, and the extension edge extends along the outer peripheral wall of the rotor cavity to form a package for the rotor cavity.

The beneficial effect of such a setting is: using the above scheme, wrapping the bracket through the stator core further increases the strength of the bracket and improves the product quality.

The invention is further provided that mutually extending steps are provided between the extension sides of the two stator cores.

The beneficial effect of this arrangement is: using the above scheme, the steps are inserted, the structure is simple, which is further beneficial to the combination of the stator cores, it is not easy to run off under the magnetic attraction of the rotor, the structure is more stable, and the structure is simple and conducive to achieve.

The invention is further provided that the rotor core is provided with a through hole, and the rotating shaft is mated with the rotor core through the through hole. The rotor core is provided with receiving slots on both sides of the rotating shaft, and the receiving A magnetic member is provided in the slot, and a plurality of air slots for preventing magnetic leakage are provided between the side of the magnetic member remote from the rotating shaft and the rotor core and on the rotor core in the circumferential direction of the rotating shaft.

The beneficial effect of this arrangement is that: using the above scheme, the magnetic component package is used, and only two magnetic components are provided at the same time to make the shaft swing left and right more stable. Further, air grooves at both ends of the magnetic component, that is, the magnetic component is away from the shaft. Between one side and the rotor core, and between the side of the magnetic member close to the shaft and the shaft, it can prevent the leakage of magnetic force and oversaturation of the magnetic force. It can effectively use the magnetic force of the magnet and increase the performance of the motor, making the motor better. Driving force.

The invention is further provided that the rotor core is provided with holding grooves on both sides thereof, the rotating shaft is disposed at the center position of the rotor core, the magnetic pieces are symmetrically disposed on both sides of the through hole, and the radial section of the rotor core is Set symmetrically in the center.

The beneficial effect of this arrangement is that: using the above scheme, the holding groove is provided to facilitate the hand or machine to take out the iron core, it is convenient to install the iron core into the motor, and the production and processing efficiency is improved. At the same time, the cross section is symmetrically arranged at the center, so that the left and right amplitudes of the rotor deflection are similar, which increases the stability of the overall mechanism, makes the force more balanced, and improves the use of the product.

The present invention is further provided that the air groove includes an inner groove, an outer groove, and a circumferential groove, the inner groove is provided between the rotating shaft and the magnetic piece, and the outer groove is provided between the magnetic piece and the rotor core. Circumferential grooves are located on both sides of the rotating shaft and are arranged between two inner grooves. The inner grooves extend to the peripheral wall of the rotor core to form an arc-shaped groove. The rotor core is between the arc-shaped groove and the inner groove and the circumferential groove and Reinforcing ribs are arranged between the inner grooves. .

The beneficial effect of this arrangement is that: using the above scheme, the reinforcement ribs can increase the strength of the iron core rotor, avoid the instability of the overall structure due to the existence of the air grooves and openings, and improve the stability of the structure.

According to the present invention, the rotor core is arranged in a cylindrical shape, and the ratio of the width of the stator core to the diameter of the rotor core is 0.25 to 0.7.

The beneficial effect of such a setting is: by adopting the above scheme, adopting this structure ratio increases the rotor's rotational force, increases the output power of the shaft, increases the swing of the shaft, and improves the use effect of the motor.

The invention further provides that a limiting block is provided on the rotating shaft, a limiting slot is provided in the rotor cavity at a position corresponding to the limiting block, and the limiting block is swingably set in the limiting slot.

The beneficial effect of such a setting is: using the above scheme, setting a limiting slot and a limiting block to avoid excessive rotation of the rotating shaft, thereby causing the phenomenon of reverse rotation of the rotor and ensuring the stability of the structure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of an embodiment of the present invention;

2 is an axial sectional view of an embodiment of the present invention;

3 is a radial cross-sectional view of a rotor core according to an embodiment of the present invention;

FIG. 4 is a radial cross-sectional view of a support bearing according to an embodiment of the present invention.

Best Mode of the Invention

An embodiment of a motor is disclosed in FIGS. 1 to 4, and includes a stator assembly and a rotor assembly. The rotor assembly includes a rotor core 5 and a rotating shaft 6. The rotor core 5 is connected to the rotating shaft 6, and the rotating shaft 6 Support bearings 61 are provided at both ends of the rotor core 5, and the stator assembly includes the coil 4, the stator core 3, and a bracket made of an insulating material. The bracket is arranged in an upper and lower layer structure, and the bracket includes a symmetrical arrangement. The upper bracket 1 and the lower bracket 2 are combined, and the upper bracket 1 and the lower bracket 2 are combined to form a rotor cavity 12 for accommodating the rotor core 5, the rotating shaft 6 is inserted in the rotor cavity 12, and the rotating shaft 6 is further provided. A limiting block 62 is provided with a limiting slot 13 in the rotor cavity 12 at a position corresponding to the limiting block 62. The limiting block 62 is swingably disposed in the limiting slot 13. Both the upper bracket 1 and the lower bracket 2 are provided. The stator coil slot 11 is provided, and the upper bracket 1 and the lower bracket 2 are provided with a mounting slot 14 communicating with the rotor cavity 12. The stator core 3 is inserted in the mounting slot 14 and is disposed adjacent to the rotor core 5. The coil 4 is wound in a stator coil slot 11 to form a winding around the stator core 3, The rotor core 5 is disposed between two stator cores 3, the stator core 3 and the rotor core 5 are fitted with a clearance, and the end surface of the stator core 3 facing the rotor core 5 is provided with a reciprocating groove 32. The reciprocating groove 32 is provided along the length direction of the stator core 3, and the rotor core 5 is provided with a mounting base 34 corresponding to the support bearing 61 at a position corresponding to the support bearing 61. The rotating shaft 6 is formed by the cooperation of the support bearing 61 and the mounting base. In cooperation with the rotation of the bracket, the stator core 3 is formed with an extension edge 31 toward the outer circumferential surface of the mounting slot 14, and the extension edge 31 extends along the outer peripheral wall of the rotor cavity 12 to form a package for the rotor cavity 12, and the two stator cores 3 extend Steps 33 are provided between the contact surfaces of the sides 31.

The rotor core 5 is arranged in a columnar shape, and the ratio of the diameter of the rotor core 5 to the width of the stator core 3 is 0.38. The rotor core 5 is provided with a through hole for inserting with the rotating shaft 6 in the center. The rotor core 5 is provided with accommodating grooves 57 symmetrically on both sides of the rotating shaft 6, and a magnetic member 51 is disposed in the receiving groove 57. The magnetic piece 51 is located between the side far from the rotating shaft 6 and the rotor core 5, and the rotor. The iron core 5 is provided with a plurality of air grooves for preventing magnetic leakage in the circumferential direction of the rotating shaft 6. The air grooves include an inner groove 52, an outer groove 53, and a circumferential groove 56. The inner groove 52 is provided on the rotating shaft 6 and magnetically. Between the pieces 51, the outer groove 53 is provided between the magnetic piece 51 and the rotor core 5, and the circumferential groove 56 is located on both sides of the rotating shaft 6 and is provided between the two inner grooves 52. The circumferential wall of the rotor core 5 extends to form an arc-shaped groove 54. The rotor core 5 is provided with a rib 55 between the arc-shaped groove 54 and the inner groove 52 and between the circumferential groove 56 and the inner groove 52. The rotor Holding grooves are provided on both sides of the iron core 5, the magnetic pieces 51 are symmetrically arranged on both sides of the rotating shaft 6, and the radial section of the rotor iron core 5 is symmetrically arranged at the center.

The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of rights of the present invention cannot be limited by this. Therefore, equivalent changes made according to the scope of patent application of the present invention, for example, equivalent products with similar processes and similar structures still belong to The scope of the invention.

Claims

A motor includes a stator assembly and a rotor assembly. The rotor assembly includes a rotating shaft and a rotor core. The rotor core is connected to the rotating shaft. A supporting bearing is provided on the rotating shaft. The stator assembly includes a bracket and a stator core. And a coil, a rotor cavity for accommodating a rotor core is formed on the bracket, the rotating shaft is inserted in the rotor cavity, and a stator coil slot is provided on the bracket, characterized in that: The rotor cavity communicates with a mounting slot, and the stator core is inserted into the mounting slot and is disposed close to the rotor core. The stator core is provided with a supporting table corresponding to the supporting bearing at the position of the supporting bearing, and the rotating shaft passes through the supporting bearing. The cooperation with the mounting table forms the rotation cooperation with the bracket, and the coil is wound and arranged in the stator coil slot to form a winding around the stator core.
The motor according to claim 1, wherein an end surface of the stator core facing the rotor core is provided with a reciprocating groove, and the reciprocating groove is provided along a length direction of the stator core.
The motor according to claim 1 or 2, wherein the bracket is arranged in an upper and lower structure, the bracket comprises a symmetrical upper bracket and a lower bracket, and the upper bracket and the lower bracket are combined to form a rotor cavity. The upper bracket and the lower bracket are both mated and fitted with a stator core, and the rotor core is arranged between the two stator cores and fits with the stator core gap.
The motor according to claim 3, characterized in that: the stator iron core is formed with an extension edge extending outward from the installation slot, and the extension edge extends along the outer peripheral wall of the rotor cavity to form a package for the rotor cavity.
The motor according to claim 4, characterized in that: steps extending from each other are provided between the extension sides of the two stator cores.
The motor according to claim 1, characterized in that: the rotor core is provided with a through hole, and the rotating shaft is mated with the rotor core through the through hole, and the rotor core is formed on both sides of the rotating shaft. An accommodating groove is provided with a magnetic member, and a plurality of air grooves for preventing magnetic leakage are provided on a side of the magnetic member away from the rotating shaft and the rotor core and on the rotor core in the circumferential direction of the rotating shaft. .
The motor according to claim 6, characterized in that: two sides of the rotor core are provided with holding grooves, the rotating shaft is disposed at the center position of the rotor core, and the magnetic members are symmetrically disposed on both sides of the through hole, so The radial section of the rotor core is symmetrically arranged at the center.
The motor according to claim 6 or 7, wherein the air groove includes an inner groove, an outer groove, and a circumferential groove, the inner groove is disposed between the rotating shaft and the magnetic member, and the outer groove is disposed on the magnetic Between the rotor and the iron core of the rotor, the circumferential grooves are located on both sides of the rotating shaft and are arranged between two inner grooves. The inner grooves extend toward the peripheral wall of the rotor core to form an arc-shaped groove, and the rotor core is in the arc-shaped groove. Reinforcing ribs are provided between the inner groove and the circumferential groove and the inner groove.
The motor according to claim 5 or 6, wherein the rotor core is provided in a cylindrical shape, and a ratio of a width of the stator core to a diameter of the rotor core is 0.25 to 0.7.
The motor according to claim 1, wherein a limit block is provided on the rotating shaft, a limit slot is provided in the rotor cavity at a position corresponding to the limit block, and the limit block is swingably set in the limit slot. .