CN111102292A - Magnetic suspension bearing assembly, outer rotor motor assembly and motor - Google Patents

Abstract

The invention provides a magnetic suspension bearing assembly, an outer rotor motor assembly and a motor, relates to the technical field of motors, and solves the technical problems that an existing magnetic suspension motor is large in size at least in the axial direction and is not suitable for occasions with small space and large inertia. The magnetic suspension bearing assembly comprises a central shaft assembly and a rotor assembly; the central shaft assembly is provided with a containing gap, at least a part of the rotor assembly is arranged in the gap, and the central shaft assembly can provide electromagnetic force to the rotor assembly to keep the rotor assembly suspended and at least limit the axial and radial displacement of the rotor assembly. The outer rotor motor assembly comprises a motor stator assembly and a magnetic suspension bearing assembly. The motor comprises a motor body and an outer rotor motor component. The invention provides a magnetic suspension bearing assembly, an outer rotor motor assembly and a motor, which have compact structure and can reduce the size of the whole motor on the premise of ensuring the rotational inertia.

Description

Magnetic bearing assembly, outer rotor motor assembly and motor

technical field

The present invention relates to the technical field of electric motors, in particular to a magnetic suspension bearing assembly, an outer rotor motor assembly provided with the magnetic suspension bearing assembly, and a motor provided with the outer rotor motor assembly.

Background technique

Magnetic bearing is to suspend the rotating shaft (or rotor) in the motor through the electromagnetic force of the magnetic bearing, so that there is no mechanical contact between the rotating shaft and the bearing, and there is no mechanical friction, which is a kind of low loss. , High-performance bearings. While realizing the high speed of the motor rotor, it also has the advantages of no mechanical wear, low energy consumption, low noise, long life, no need for lubrication and sealing, and no oil pollution. The rotor speed of the magnetic levitation motor is only limited by the tensile strength of the rotor material. Therefore, the circumferential speed of the rotor of the magnetic levitation motor can be very high, and it is more and more widely used in high-speed equipment.

The outer rotor motor is the opposite of the general motor, the rotor is outside and the stator is inside. The advantages are that the moment of inertia is large, the heat dissipation is good, copper wires are saved, and loads such as fan blades can be directly connected to the rotor, which meets the installation requirements of a small-volume whole machine with a certain power. The diameter of the armature core can be made larger, thereby improving the efficiency and output power of the motor under unstable load. However, the applicant found that the magnetic levitation motor in the prior art is generally equipped with at least two radial magnetic bearings and a pair of axial magnetic bearings to position the rotor radially and axially. rotor, resulting in a larger size of the whole machine at least in the axial direction.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a magnetic suspension bearing assembly, an outer rotor motor assembly provided with the magnetic suspension bearing assembly, and a motor provided with the outer rotor motor assembly, so as to solve the problem that the magnetic suspension motor existing in the prior art has a large size at least in the axial direction , it is not suitable for technical problems in occasions where space is small and large inertia is required. The technical effects that can be produced by the preferred technical solutions among the technical solutions of the present invention are described in detail below.

For achieving the above object, the invention provides the following technical solutions:

The magnetic suspension bearing assembly provided by the present invention includes a central shaft assembly and a rotor assembly; wherein,

The central shaft assembly has a receiving void in which at least a portion of the rotor assembly is disposed, the central shaft assembly capable of providing electromagnetic force to the rotor assembly to keep the rotor assembly suspended and at least capable of Displacement of the rotor assembly in its axial and radial directions is limited.

In a preferred or optional embodiment, the rotor assembly includes a rotor and a thrust disk, the thrust disk is fixedly connected with the rotor, and the rotor is sleeved outside at least a part of the central shaft assembly, so The thrust disk is disposed at least partially in a gap in the central shaft assembly.

In a preferred or optional embodiment, the central shaft assembly includes an axial positioning assembly and a radial positioning assembly, the thrust plate includes an axial positioning portion and a radial positioning portion, and the axial positioning portion is provided at the In the space in the axial positioning assembly, the radial positioning portion is provided in the space between the axial positioning assembly and the radial positioning assembly.

In a preferred or optional embodiment, the central shaft assembly further includes a mounting shaft, the axial positioning assembly includes a first axial iron core and a second axial iron core, the first axial iron core and The second axial iron cores are all sleeved and fixedly installed on the installation shaft, and the two are arranged at intervals along the axial direction of the installation shaft, and the axial positioning portion of the thrust plate is arranged on the first shaft. in the space between the axial iron core and the second axial iron core.

In a preferred or optional embodiment, axial windings are wound in regions of the first and second axial iron cores near the axial positioning portion to provide shafts to the rotor assembly. Electromagnetic force in the direction.

In a preferred or optional embodiment, the axial windings provided in the first axial iron core and the second axial iron core are wound along the circumferential direction of the installation shaft.

In a preferred or optional embodiment, the central shaft assembly further includes a mounting shaft, the axial positioning assembly is fixedly mounted on the mounting shaft, the radial positioning assembly includes a radial iron core, and the diameter The iron core is sleeved and fixed on the installation shaft, and there is a gap between the radial iron core and the axial positioning assembly along the radial direction of the installation shaft, and the radial positioning portion of the thrust plate is arranged at the in the gap between the radial iron core and the axial positioning assembly.

In a preferred or optional embodiment, radial windings are wound in the radial iron core to provide radial electromagnetic force to the rotor assembly.

In a preferred or optional embodiment, the radial winding provided in the radial iron core is wound along the axial direction of the installation shaft.

In a preferred or optional embodiment, the central shaft assembly further includes an installation shaft and a casing, and the installation shaft is fixedly connected with the casing.

The outer rotor motor assembly provided by the present invention includes the motor stator assembly and the magnetic suspension bearing assembly provided by any technical solution of the present invention; wherein,

The motor stator assembly is fixedly connected to the central shaft assembly, the rotor assembly includes a rotor and a thrust disk, the thrust disk is fixedly connected to the rotor, and the rotor is sleeved outside the motor stator assembly.

In a preferred or optional embodiment, the motor stator assembly includes a stator iron core and a stator winding, the stator iron core is fixedly connected to the central shaft assembly, and the stator winding is along an axial direction of the central shaft assembly wound in the stator core.

The motor provided by the present invention includes a motor body and an outer rotor motor assembly provided by any of the technical solutions of the present invention.

Based on the above technical solutions, the embodiments of the present invention can at least produce the following technical effects:

The magnetic suspension bearing assembly provided by the present invention includes a central shaft assembly and a rotor assembly, and at least a part of the rotor assembly is arranged in a gap in the central shaft assembly, because the central shaft assembly can provide the rotor assembly with The electromagnetic force keeps the rotor assembly suspended, which can ensure that the rotor assembly has no mechanical wear during the rotation process, low energy consumption, and low noise; the electromagnetic force provided by the central shaft assembly to the rotor assembly can limit the The displacement of the rotor assembly in its axial and radial directions, at least two radial magnetic bearings and a pair of axial magnetic bearings in the prior art are integrated into one magnetic suspension bearing assembly, and the required inertia is guaranteed. At least the dimension in the axial direction is saved, and the structure is more compact, so that it is more convenient to be applied to a motor with a small space and a large inertia.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic diagram of an axial cross-sectional structure of an outer rotor motor assembly provided by the present invention;

2 is a schematic cross-sectional structural diagram of an outer rotor motor assembly provided by the present invention;

FIG. 3 is a schematic diagram of the electromagnetic circuit of the motor and the electromagnetic circuit of the radial positioning assembly shown in FIG. 2;

Fig. 4 is the partial enlarged schematic diagram of Fig. 3;

FIG. 5 is a schematic diagram of the electromagnetic circuit of the axial positioning assembly shown in FIG. 2 .

In the figure, 1, the central shaft assembly; 11, the axial positioning assembly; 111, the first axial iron core; 112, the second axial iron core; 113, the axial winding; 12, the radial positioning assembly; 121, the diameter To iron core; 122, radial winding; 13, installation shaft; 14, casing; 15, axial air gap; 16, radial air gap; 2, rotor assembly; 21, rotor; 22, thrust plate; 221, Axial positioning part; 222, radial positioning part; 3, motor stator assembly; 31, stator iron core; 32, stator winding; 4, motor air gap.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other implementations obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

The present invention provides a magnetic suspension bearing assembly with a compact structure and at least an axial dimension of the entire motor under the premise of ensuring the moment of inertia, an outer rotor motor assembly provided with the magnetic suspension bearing assembly, and an outer rotor motor assembly provided with the outer rotor motor assembly of the motor.

The technical solutions provided by the present invention will be described in more detail below with reference to FIGS. 1 to 5 .

As shown in FIGS. 1 to 5 , the magnetic suspension bearing assembly provided by the present invention includes a central shaft assembly 1 and a rotor assembly 2; wherein,

The central shaft assembly 1 has an accommodating gap in which at least a partial section of the rotor assembly 2 is disposed, and the central shaft assembly 1 can provide electromagnetic force to the rotor assembly 2 to keep the rotor assembly 2 suspended and at least limit the rotor assembly 2 in the air. its axial and radial displacements.

The magnetic suspension bearing assembly provided by the present invention includes a central shaft assembly 1 and a rotor assembly 2. At least a part of the rotor assembly 2 is arranged in the gap in the central shaft assembly 1. Since the central shaft assembly 1 can provide electromagnetic force to the rotor assembly 2 Keeping the rotor assembly 2 in suspension can ensure that the rotor assembly 2 has no mechanical wear during the rotation process, low energy consumption, and low noise; the electromagnetic force provided by the central shaft assembly 1 to the rotor assembly 2 can also limit the rotor assembly 2 in its axis. Integrating at least two radial magnetic bearings and a pair of axial magnetic bearings in the prior art into one magnetic suspension bearing assembly, under the condition of ensuring the required inertia, it greatly saves at least axial The size and structure are more compact, making it more convenient to apply to motors with small space and large inertia.

As a preferred or optional embodiment, the rotor assembly 2 includes a rotor 21 and a thrust disk 22, the thrust disk 22 is fixedly connected with the rotor 21, the rotor 21 is sleeved outside at least a part of the central shaft assembly 1, and the thrust disk 22 is at least partially The segments are arranged in voids within the central shaft assembly 1 .

Specifically, the thrust disc 22 and the rotor 21 may be fixed by welding or bolt connection. Since the rotor 21 and the thrust disc 22 are fixedly connected, at least part of the thrust disc 22 is disposed on the center shaft assembly 1 . In the space, the central shaft assembly 1 can provide electromagnetic force for the thrust disc 22 to suspend the thrust disc 22 and limit its axial and radial displacement, thereby realizing the suspension of the rotor 21 and limiting the axial and radial displacement of the rotor 21 .

As a preferred or optional embodiment, the central shaft assembly 1 includes an axial positioning assembly 11 and a radial positioning assembly 12, the thrust plate 22 includes an axial positioning portion 221 and a radial positioning portion 222, and the axial positioning portion 221 is disposed on the shaft The radial positioning portion 222 is provided in the space between the axial positioning member 11 and the radial positioning member 12 into the space in the positioning assembly 11 .

Specifically, the axial positioning portion 221 is disposed in the gap in the axial positioning assembly 11 , the axial positioning assembly 11 provides axial electromagnetic force to the axial positioning portion 221 , and the axial positioning portion 221 provides the rotor assembly 2 in the axial direction. The force-bearing part on the upper part makes the rotor assembly 2 suspend in the axial direction and realize axial positioning; the radial positioning part 222 is arranged in the gap between the axial positioning assembly 11 and the radial positioning assembly 12, and the radial positioning assembly 12 A radial electromagnetic force is provided to the radial positioning portion 222, and the radial positioning portion 222 is the force-bearing part of the rotor assembly 2 in the radial direction, so that the rotor assembly 2 is suspended in the radial direction and realizes radial positioning, and the suspension function and the radial direction are realized. And the axial positioning function is integrated on a thrust plate 22, which greatly reduces the volume of the magnetic suspension bearing assembly.

As a preferred or optional embodiment, the central shaft assembly 1 further includes a mounting shaft 13, the axial positioning assembly 11 includes a first axial iron core 111 and a second axial iron core 112, the first axial iron core 111 and the first axial iron core 111 and the The two axial iron cores 112 are both sleeved and fixedly installed on the installation shaft 13 and are arranged at intervals along the axial direction of the installation shaft 13 . The axial positioning portion 221 of the thrust plate 22 is disposed on the first axial iron core 111 and the in the space between the second axial iron cores 112 .

As a preferred or optional embodiment, axial windings 113 are wound in regions of the first axial iron core 111 and the second axial iron core 112 close to the axial positioning portion 221 to provide axial electromagnetic force to the rotor assembly 2 .

Specifically, the first axial iron core 111 and the second axial iron core 112 are both composed of soft magnetic materials with strong magnetic permeability, such as No. 45 steel. The first axial iron core 111 and the second axial iron core 112 and The installation shafts 13 are connected by an interference fit; the first axial iron core 111 and the second axial iron core 112 are arranged at intervals along the axial direction of the installation shaft 13, and the axial positioning portion 221 is arranged between the two. In the gap, axial windings 113 are wound in the first axial iron core 111 and the second axial iron core 112. As shown in FIG. A magnetic flux loop is formed between the axial iron core 112 , the axial air gap 15 and the thrust disc 22 , which can provide electromagnetic force to the axial positioning portion 221 ; at this time, the first axial iron core 111 and the second axial iron core 111 and the second axial The current directions of the axial windings 113 in the iron core 112 are opposite, so opposite electromagnetic forces can be generated, and the magnitude of the current in the different axial windings 113 can be adjusted so that the axial positioning portion 221 is suspended between the first axial iron core 111 and the second axial core 111. In the space between the two axial iron cores 112, axial suspension and positioning are realized, and electromagnetic force is used for positioning, and the positioning accuracy is higher.

As a preferred or optional embodiment, the axial windings 113 provided in the first axial iron core 111 and the second axial iron core 112 are both wound along the circumferential direction of the installation shaft 13 .

As a preferred or optional embodiment, the central shaft assembly 1 further includes an installation shaft 13, the axial positioning assembly 11 is fixedly installed on the installation shaft 13, the radial positioning assembly 12 includes a radial iron core 121, and the radial iron core 121 is sleeved Set and fixed on the installation shaft 13 and there is a gap between the radial iron core 121 and the axial positioning assembly 11 along the radial direction of the installation shaft 13, the radial positioning portion 222 of the thrust plate 22 is arranged between the radial iron core 121 and the axial direction. in the space between the positioning components 11 .

As a preferred or optional embodiment, radial windings 122 are wound in the radial iron core 121 to provide radial electromagnetic force to the rotor assembly 2 .

Specifically, the radial iron core 121 is composed of silicon steel sheet laminations with strong magnetic permeability, and the lamination method is beneficial to reduce eddy current loss and improve efficiency, and is connected with the installation shaft 13 by interference fit; The radial winding 122 is wound inside the 121. As shown in Fig. 3-Fig. 4, after passing the current, the electromagnetic field forms a magnetic flux loop between the radial iron core 121, the radial air gap 16 and the thrust disc 22. The positioning portion 222 generates a radial electromagnetic force, so that the radial positioning portion 222 is suspended in the gap between the radial iron core 121 and the axial positioning assembly 11, thereby realizing radial suspension and positioning. Electromagnetic force is used for positioning and positioning. The accuracy is higher, and due to the reduced axial dimension, it is more helpful to improve the coaxiality of the magnetic suspension bearing assembly.

As a preferred or optional embodiment, the radial windings 122 provided in the radial iron core 121 are wound along the axial direction of the installation shaft 13 .

Specifically, the axial winding 113 and the radial winding 122 are both wound by enameled wires.

As a preferred or optional embodiment, the central shaft assembly 1 further includes an installation shaft 13 and a casing 14 , and the installation shaft 13 is fixedly connected to the casing 14 .

Specifically, the connection between the installation shaft 13 and the casing 14 is an interference fit, and the installation shaft plays a basic fixing role; the rotor 21 is a shell-like structure, and the casing 14 can cover the mouth of the rotor 21 to position the axial direction. The assembly 11 and the radial positioning assembly 12 are wrapped in the space formed therein. The rotor 21 can not only play the role of the output shaft, but also protect the internal parts, further realizing integration, making the structure more compact and reducing the size .

The outer rotor motor assembly provided by the present invention includes the motor stator assembly 3 and the magnetic suspension bearing assembly provided by any technical solution of the present invention; wherein,

The motor stator assembly 3 is fixedly connected to the central shaft assembly 1 , the rotor assembly 2 includes a rotor 21 and a thrust disc 22 , the thrust disc 22 is fixedly connected to the rotor 21 , and the rotor 21 is sleeved outside the motor stator assembly 3 .

Specifically, the rotor 21 is suspended on the outer circumference of the motor stator assembly 3, and the motor stator assembly 3 provides a rotating magnetic field; in the present invention, the rotor 21 is arranged on the outer circumference of the motor stator assembly 3, and the outer circumference of the magnetic pole, relative to the inner rotor motor, under the same volume, the outer circumference The magnetic pole area is larger, and the output electromagnetic force is larger and the power is relatively larger under the same current. The rotor 21 is arranged on the outer circumference, and the radius of the rotor 21 is larger. Under the same mass, the rotation radius is larger, and the inertia is also bigger.

As a preferred or optional embodiment, the motor stator assembly 3 includes a stator iron core 31 and a stator winding 32 , the stator iron core 31 is fixedly connected to the central shaft assembly 1 , and the stator winding 32 is wound around the stator iron along the axial direction of the central shaft assembly 1 . inside the core 31.

Specifically, the stator iron core 31 is made of laminated silicon wafers with strong magnetic conductivity, and the lamination method is beneficial to reduce eddy current loss and improve efficiency; A rotating electromagnetic field can be provided. In addition, since the rotor 21 is arranged on the outer periphery of the motor stator assembly 3, compared with the inner rotor motor, the outer periphery has a larger area under the same volume, and when the output is equivalent to the electromagnetic force, the required enameled wire is relatively less, so that the enameled wire can be saved.

The stator core 31 is wound with the stator winding 32. As shown in Figures 3 to 4, after the current is applied, the electromagnetic field forms the magnetic flux loop of the motor between the stator core 31, the motor air gap 4 and the rotor 21, which realizes The rotor 21 performs rotational movement in the circumferential direction.

The motor provided by the present invention includes a motor body and an outer rotor motor assembly provided by any of the technical solutions of the present invention.

Specifically, the casing 14 in the outer rotor motor unit can be the rear casing of the motor, and the rotor 21 can be directly used as an output shaft and connected to loads such as fan blades.

Unless otherwise stated in any of the technical solutions disclosed in the present invention, if it discloses a numerical range, then the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred numerical range is only Among the many implementable numerical values, the technical effect is relatively obvious or representative. Since the numerical values are too numerous to be exhaustive, only some numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values shall not constitute a limitation on the protection scope of the present invention.

If words such as "first" and "second" are used herein to define components, those skilled in the art should know that the use of "first" and "second" is only for the convenience of describing components The above terms have no special meaning unless otherwise stated.

At the same time, if the above-mentioned invention discloses or involves parts or structural parts that are fixedly connected to each other, then, unless otherwise stated, fixed connection can be understood as: detachable fixed connection (for example, using bolts or screws), or It is understood as: non-removable fixed connection (such as riveting, welding), of course, the mutual fixed connection can also be an integral structure (such as using a casting process to be integrally formed to replace it (except that it is obviously impossible to use an integral molding process).

In addition, unless otherwise stated, the terms used in any of the technical solutions disclosed in the present disclosure used to represent positional relationships or shapes include states or shapes that are similar to, similar to, or close to. Any component provided by the present invention may be assembled from a plurality of individual components, or may be a single component manufactured by an integral molding process.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand: The specific embodiments of the invention are modified or some technical features are equivalently replaced; without departing from the spirit of the technical solutions of the present invention, all of them should be included in the scope of the technical solutions claimed in the present invention.

Claims (13)

1. a magnetic suspension bearing assembly, is characterized in that, comprises central shaft assembly and rotor assembly; Wherein, The central shaft assembly has a receiving void in which at least a portion of the rotor assembly is disposed, the central shaft assembly capable of providing electromagnetic force to the rotor assembly to keep the rotor assembly suspended and at least capable of Displacement of the rotor assembly in its axial and radial directions is limited. 2 . The magnetic suspension bearing assembly of claim 1 , wherein the rotor assembly comprises a rotor and a thrust disk, the thrust disk is fixedly connected to the rotor, and the rotor is sleeved on at least one of the central shaft assemblies. 3 . Outside of a partial section, the thrust disk is disposed in a gap in the central shaft assembly at least in a partial section. 3 . The magnetic suspension bearing assembly according to claim 2 , wherein the central shaft assembly includes an axial positioning assembly and a radial positioning assembly, the thrust plate includes an axial positioning portion and a radial positioning portion, and the The axial positioning portion is provided in the space in the axial positioning assembly, and the radial positioning portion is disposed in the space between the axial positioning assembly and the radial positioning assembly. 4 . The magnetic suspension bearing assembly according to claim 3 , wherein the central shaft assembly further comprises a mounting shaft, the axial positioning assembly comprises a first axial iron core and a second axial iron core, and the The first axial iron core and the second axial iron core are both sleeved and fixedly installed on the installation shaft, and the two are arranged at an axial interval along the installation shaft, and the axial positioning of the thrust plate A portion is provided in the gap between the first axial iron core and the second axial iron core. 5 . The magnetic suspension bearing assembly according to claim 4 , wherein the regions of the first axial iron core and the second axial iron core close to the axial positioning portion are wound with axial winding energy. 6 . An axial electromagnetic force is provided to the rotor assembly. 6 . The magnetic suspension bearing assembly according to claim 5 , wherein the axial windings provided in the first axial iron core and the second axial iron core are both wound along the circumferential direction of the installation shaft. 7 . . 7 . The magnetic suspension bearing assembly according to claim 3 , wherein the central shaft assembly further comprises a mounting shaft, the axial positioning assembly is fixedly mounted on the mounting shaft, and the radial positioning assembly includes a diameter towards the iron core, the radial iron core is sleeved and fixed on the installation shaft, and there is a gap between the radial iron core and the axial positioning assembly along the radial direction of the installation shaft, the thrust plate The radial positioning part is arranged in the gap between the radial iron core and the axial positioning assembly. 8 . The magnetic suspension bearing assembly of claim 7 , wherein radial windings are wound in the radial iron core to provide radial electromagnetic force to the rotor assembly. 9 . 9 . The magnetic suspension bearing assembly according to claim 8 , wherein the radial winding provided in the radial iron core is wound along the axial direction of the installation shaft. 10 . 10 . The magnetic suspension bearing assembly according to claim 3 , wherein the central shaft assembly further comprises an installation shaft and a casing, and the installation shaft is fixedly connected with the casing. 11 . 11. An outer rotor motor assembly, characterized by comprising a motor stator assembly and the magnetic suspension bearing assembly according to any one of claims 1-10; wherein, The motor stator assembly is fixedly connected to the central shaft assembly, the rotor assembly includes a rotor and a thrust disk, the thrust disk is fixedly connected to the rotor, and the rotor is sleeved outside the motor stator assembly. 12 . The outer rotor motor assembly according to claim 11 , wherein the motor stator assembly comprises a stator iron core and a stator winding, the stator iron core is fixedly connected with the central shaft assembly, and the stator winding is along the axis. 13 . The axial direction of the central shaft assembly is wound in the stator iron core. 13. A motor, characterized by comprising a motor body and the outer rotor motor assembly according to any one of claims 11-12.

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