CN216353629U

CN216353629U - Magnet assembly

Info

Publication number: CN216353629U
Application number: CN202122984309.7U
Authority: CN
Inventors: 童卫星; 李美霞
Original assignee: Shenzhen Tongyida Magnetic Industry Co ltd
Current assignee: Shenzhen Tongyida Magnetic Industry Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-04-19
Anticipated expiration: 2031-11-30

Abstract

The utility model discloses a magnet assembly, which comprises a magnetism gathering shell and a magnet, wherein the magnetism gathering shell is a shell with an opening on one side, the shape of the magnetism gathering shell is matched with that of the magnet, the magnet is arranged in the magnetism gathering shell, one magnetic pole of the magnet is exposed in the opening of the magnetism gathering shell, and the wall thickness of the magnetism gathering shell is 10% -50% of the height of the magnet assembly. The utility model utilizes the magnetism gathering shell to seal the magnet, only one pole is kept outside, the magnetic flux generated by the sealed magnetic pole is refracted by the magnetism gathering shell and turns to the opening of the magnetism gathering shell, and the refracted magnetic flux can extend and return to the other magnetic pole, thereby increasing the magnetic field intensity of the magnet and improving the torque and the rotating speed of the motor; meanwhile, on the basis of maintaining the magnetic strength of the magnet unchanged or improved, the magnet assembly has the same volume as the original magnet, but part of the magnet is replaced by the magnetism gathering shell, so that the volume of the magnet is reduced by 20-65%, a large amount of cost can be saved, the utilization rate of rare earth resources is improved, and the high-efficiency permanent magnet has extremely high economic value.

Description

Magnet assembly

Technical Field

The utility model relates to the technical field of permanent magnets, in particular to a magnet assembly.

Background

An electric machine typically includes a stator fixed to a housing and a rotor movable relative to the stator. For example, the rotor may be supported such that it is rotatable relative to the stator or such that it is linearly movable relative to the stator, and the electrical machine is classified as an electromechanical energy converter and may be used as an electrical motor or a generator.

With the development of modern industrial technology, a large number of working occasions require the motor to operate at a low speed and provide a high torque. In order to realize the low-speed operation of the motor, a power supply with lower working frequency is adopted to supply power to the asynchronous motor or increase the pole pair number of the asynchronous motor, the low-frequency power supply needs expensive power electronic equipment such as an inverter and the like, the influence is not favorable for the stable operation of the motor, the leakage inductance is overlarge due to the increase of the pole pair number of the motor at one step, the power factor of the motor is reduced, although the permanent magnet motor does not need to adopt an electric excitation mode, the leakage flux is too much due to the excessive number of the pole pair numbers of the permanent magnet, and the motor output is lost; according to the motor design theory, the torque of the motor is approximately proportional to the motor volume, which means that the large-torque motor has larger volume, larger occupied space, more materials used by the motor and higher cost. Therefore, the traditional industry mostly adopts a mechanical transmission mechanism such as a gear box and the like to match the rotating speed and the torque of the motor and the load. But the inherent defects of the motor system such as vibration, noise, metal fatigue and the like greatly reduce the stability of the motor working system and improve the maintenance cost and the maintenance difficulty of the motor system.

Meanwhile, the most important and unique component of a permanent magnet synchronous motor, which is one of the mainstream driving motors nowadays, is the permanent magnet inside the permanent magnet synchronous motor, and the most important material source for manufacturing the permanent magnet is rare earth. Rare earth is a general name of seventeen metal elements including lanthanide elements, scandium and yttrium in the periodic table of elements, wherein neodymium elements and samarium elements are closely related to permanent magnets, and are important components of the Ru iron boron magnets and the Sm cobalt magnets which are most commonly used nowadays. However, with the reduction of the rare earth stock in China and the large fluctuation of the rare earth price in the market in recent years, the prices of the Ru iron boron magnet and the samarium cobalt magnet are increased and the supply is insufficient, and the progress of the social productivity is seriously hindered. Therefore, it is necessary to improve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a magnet assembly which has the advantages of improving the performance of a motor, reducing the production cost and improving the utilization rate of rare earth resources, and solves the problems in the background technology.

In order to achieve the purpose, the utility model provides the following technical scheme: a magnet assembly comprises a magnetism gathering shell and a magnet, wherein the magnetism gathering shell is a shell with an opening on one side, the shape of the magnetism gathering shell is matched with that of the magnet, the magnet is arranged in the magnetism gathering shell, one magnetic pole of the magnet is exposed in the opening of the magnetism gathering shell, and the wall thickness of the magnetism gathering shell is 10% -50% of the height of the magnet assembly.

Preferably, the outer wall of the magnetism gathering shell is provided with a plurality of grooves.

Preferably, the flux-focusing shell is made of a soft magnetic material.

Compared with the prior art, the utility model has the following beneficial effects:

in the utility model, a magnetism gathering shell made of soft magnetic materials is used for closing the magnet, only one pole is kept outside, the magnetic flux generated by the closed magnetic pole is refracted by the magnetism gathering shell and turns to the opening of the magnetism gathering shell, and the refracted magnetic flux extends to the other magnetic pole due to the fact that the magnetic induction line is a closed curve, so that the magnetic field intensity of the functional surface of the magnet is increased, the magnetic field interference of the adjacent magnet can be shielded, the torque and the rotating speed of the motor are improved, and various defects of a gear box in the background art are avoided.

On the basis of maintaining the magnetic strength of the magnet unchanged or improved, the magnet assembly has the same volume as the original magnet, but part of the magnet is replaced by the magnetism gathering shell, so that the volume of the magnet is reduced by 20-65%, a large amount of cost can be saved, the utilization rate of rare earth resources is improved, and the utility model has extremely high economic value.

Drawings

FIG. 1 is a schematic view of a magnet assembly according to the present invention;

FIG. 2 is a schematic cross-sectional view of a magnet assembly of the present invention;

FIG. 3 is an exploded view of the magnet assembly of the present invention;

FIG. 4 is a schematic magnetic induction line of a conventional permanent magnet;

FIG. 5 is a magnetic flux detection diagram of a conventional permanent magnet;

FIG. 6 is a schematic view of the magnetic induction lines of the magnet assembly of the present invention;

FIG. 7 is a magnetic flux sensing view of the magnet assembly of the present invention;

FIG. 8 is a table of test data for the magnet assembly of the present invention;

FIG. 9 is a schematic structural diagram of a second embodiment of the present invention;

FIG. 10 is a schematic structural diagram of a third embodiment of the present invention;

FIG. 11 is a schematic structural view of a magnet assembly according to a third embodiment of the present invention;

FIG. 12 is a schematic structural diagram of a fourth embodiment of the present invention;

FIG. 13 is a schematic structural view of a magnet assembly according to a fourth embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a fifth embodiment of the present invention;

FIG. 15 is a schematic structural view of a magnet assembly according to a fifth embodiment of the present invention;

FIG. 16 is a schematic structural diagram of a sixth embodiment of the present invention;

FIG. 17 is a schematic structural view of a magnet assembly according to a sixth embodiment of the present invention;

FIG. 18 is a schematic structural diagram of a seventh embodiment of the present invention;

fig. 19 is a schematic structural view of a magnet assembly according to a seventh embodiment of the present invention.

The reference numerals and names in the figures are as follows:

1. a magnetism gathering shell; 11. a groove; 2. a magnet 21, a magnetic induction line; 22. a central magnet; 23. edge magnetism; 3. a motor core; 4. a magnetic ring housing; 5. and (4) a bracket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 3, a first embodiment of the present invention is shown: a magnet assembly comprises a magnetism gathering shell 1 and a magnet 2, wherein the magnetism gathering shell 1 is a shell with a single-side opening, the magnetism gathering shell 1 is matched with the magnet 2 in shape, the magnet 2 is arranged in the magnetism gathering shell 1, one magnetic pole of the magnet 2 is exposed in the opening of the magnetism gathering shell 1, namely the functional surface, and the wall thickness of the magnetism gathering shell 1 is 10% -50% of the height of the magnet assembly. According to the law of refraction of magnetic induction lines, namely, when magnetic flux enters another medium from one medium, if the magnetic conductivities of the two media are different, the induction intensity is the same as that of sound waves and light waves, the refraction phenomenon occurs, and the magnetic induction intensity can change the direction, the magnetism gathering shell 1 is utilized to seal the magnet 2, only one pole is kept outside, the magnetic flux generated by the sealed magnetic pole is refracted by the magnetism gathering shell 1 and turns to the opening of the magnetism gathering shell 1, meanwhile, because the magnetic induction lines are closed curves, the refracted magnetic flux can extend and return to the other magnetic pole, so that the magnetic field intensity of the functional surface of the magnet 2 is increased, the magnetic field interference of the adjacent magnet can be shielded, the torque and the rotating speed of the motor are improved, and various defects of the gear box in the background technology are avoided.

More specifically, the magnetism collecting case 1 is made of a soft magnetic material.

Referring to fig. 4 to 7, fig. 4 is a schematic diagram of magnetic induction lines of a conventional permanent magnet, wherein the magnetic induction lines start from one pole to enter the other pole and are waved without interference, a wave trough is called a central magnet 22, and a wave crest is called an edge magnet 23, and it can be known from fig. 5 that the magnetic property of the edge magnet 23 is strongest and the central magnet 22 is slightly weaker; comparing fig. 6 and fig. 7, it can be seen that after the shielding and refraction of the magnetism gathering shell 1, the magnetism of the shielding surface is weakened, the magnetic flux is reduced, the magnetism of the functional surface is enhanced, and the magnetic flux is increased, so that the volume of the permanent magnet 2 can be reduced and the utilization rate of rare earth resources can be improved under the condition of keeping constant magnetic force, or the magnetic property of the permanent magnet 2 can be increased to improve the performance by keeping the volume of the permanent magnet 2 unchanged.

Referring to fig. 8, the detection data table of the magnet assembly of the present application, comparing the first and third data, can find that the total volume is unchanged, but the magnet volume is reduced by 30% because a part of the magnet assembly is replaced by the magnetism gathering shell 1, the minimum and maximum magnetic fluxes are reduced, but the maximum torque and the maximum rotation speed are improved after the magnet assembly is assembled to the motor; after comparing the second item and the third item, the permanent magnets have the same volume, but the minimum magnetic flux and the maximum magnetic flux are increased after the magnetism gathering shell 1 is additionally arranged, and the torsion and the rotating speed are improved to a greater extent after the magnetism gathering shell is assembled to a motor; comparing the second to the fifth items, the performance is improved in different degrees compared with the motor composed of the conventional permanent magnet, the minimum and maximum magnetic fluxes of the magnetic convergence shell 1 are improved along with the increase of the wall thickness of the magnetic convergence shell 1, meanwhile, the maximum torque is in direct proportion to the wall thickness of the magnetic convergence shell 1, and the maximum rotating speed is in inverse proportion to the wall thickness of the magnetic convergence shell 1. Therefore, the constant torque and the constant rotating speed of the motor can be adjusted and enhanced by adjusting the thickness of the magnetism gathering shell 1, and the volume of the permanent magnet 2 can be reduced, so that the weight of the motor is reduced, and the cost of the magnet is reduced.

Referring to fig. 9, the second embodiment of the present invention is basically the same as the first embodiment, except that: the outer wall of the magnetism gathering shell 1 is provided with a plurality of grooves 11. Because the heat is easily collected in the magnet 2 when the motor runs, and the magnet 2 is sealed by the magnetism collecting shell 1, so that the heat is difficult to be dispersed, the groove 11 is intermittently arranged on the magnetism collecting shell 1 to disperse the heat, the working temperature of the magnet assembly is reduced, and the service life of the magnet assembly is prolonged.

Referring to fig. 10 to 11, a third embodiment of the present invention: the utility model provides a motor core structure, can regard as electric motor rotor or stator, several magnet subassembly is circumference and evenly installs at 3 peripheries of iron core, wherein, 2 magnet's the center that the face all points to iron core 3 that are shielded, the magnetic pole at the 3 center of the directional iron core of adjacent magnet 2 is opposite simultaneously, it all is tile-shaped to gather magnetic shell 1 and magnet 2, can have higher air gap magnetic density and torque density in less volume, can also produce reluctance torque, motor torque density has further been improved, and can effectively reduce the motor volume, improve the motor performance.

Referring to fig. 12 to 13, a fourth embodiment of the present invention: a small-sized motor magnetic ring is formed by uniformly surrounding a plurality of magnet assemblies, wherein the magnetic poles of a plurality of magnets 2 all point to the center of the magnetic ring, the magnetic poles of adjacent magnets 2 pointing to the center of the magnetic ring are opposite, a magnetic gathering shell 1 and the magnets 2 are both tile-shaped, a magnetic ring shell 4 is made of plastic, and the plastic is formed by injection molding on the magnet assemblies, so that the size of the motor can be effectively reduced, the magnetic field intensity is increased, and the performance of the motor is improved.

Referring to fig. 14 to 15, the fifth embodiment of the present invention is basically the same as the fourth embodiment, except that: the magnetic ring shell 4 is polygonal, and the magnetic gathering shell 1 and the magnet 2 are both square.

Referring to fig. 16 to 17, a sixth embodiment of the present invention: the utility model provides a cell phone stand for support and fixed cell-phone, wherein, the fixed support end that sets up at support 5 of magnet subassembly for adsorb lid behind the cell-phone, gather magnetic shell 1 and magnet 2 and all be the cake shape, can avoid because of the not enough slippage of magnetic force in the increase magnetic field intensity of maximize in limited volume.

Referring to fig. 18 to 19, a seventh embodiment of the present invention is basically the same as the sixth embodiment, except that: gather magnetic shell 1 and magnet 2 and all be the ring shape, central vacancy is used for installing the rotating member to with magnet subassembly movable mounting in the support end of support 5, can provide the rotation when supporting the cell-phone, be convenient for daily use.

It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Claims

1. A magnet assembly, characterized by: the magnetic flux concentration device comprises a magnetic concentration shell (1) and a magnet (2), wherein the magnetic concentration shell (1) is a shell with an opening on a single surface, the magnetic concentration shell (1) is matched with the magnet (2) in shape, the magnet (2) is arranged in the magnetic concentration shell (1), one magnetic pole of the magnet (2) is exposed in the opening of the magnetic concentration shell (1), and the wall thickness of the magnetic concentration shell (1) is 10% -50% of the height of a magnet assembly.

2. A magnet assembly according to claim 1, wherein: the outer wall of the magnetism gathering shell (1) is provided with a plurality of grooves (11).

3. A magnet assembly according to any one of claims 1 to 2, wherein: the magnetism gathering shell (1) is made of soft magnetic materials.