CN111102292B - Magnetic bearing assembly, outer rotor motor assembly and motor - Google Patents
Magnetic bearing assembly, outer rotor motor assembly and motor Download PDFInfo
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- CN111102292B CN111102292B CN202010035511.2A CN202010035511A CN111102292B CN 111102292 B CN111102292 B CN 111102292B CN 202010035511 A CN202010035511 A CN 202010035511A CN 111102292 B CN111102292 B CN 111102292B
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- 239000000725 suspension Substances 0.000 claims abstract description 43
- 238000006073 displacement reaction Methods 0.000 claims abstract description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 49
- 238000004804 winding Methods 0.000 claims description 29
- 239000011800 void material Substances 0.000 claims description 5
- 230000005672 electromagnetic field Effects 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 210000003298 dental enamel Anatomy 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0459—Details of the magnetic circuit
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0489—Active magnetic bearings for rotary movement with active support of five degrees of freedom, e.g. two radial magnetic bearings combined with an axial bearing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C32/00—Bearings not otherwise provided for
- F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
- F16C32/0406—Magnetic bearings
- F16C32/044—Active magnetic bearings
- F16C32/0474—Active magnetic bearings for rotary movement
- F16C32/0493—Active magnetic bearings for rotary movement integrated in an electrodynamic machine, e.g. self-bearing motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/09—Structural association with bearings with magnetic bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2380/00—Electrical apparatus
- F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
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 the 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, wherein the central shaft assembly is provided with a containing gap, at least part of sections of the rotor assembly are arranged in the gap, and the central shaft assembly can provide electromagnetic force for the rotor assembly to enable the rotor assembly to keep in suspension and at least limit the displacement of the rotor assembly in the axial direction and the radial direction. The outer rotor motor assembly comprises a motor stator assembly and a magnetic suspension bearing assembly. The motor includes a motor body and an outer rotor motor assembly. The invention is used for providing the magnetic suspension bearing assembly, the outer rotor motor assembly and the motor, which have compact structures and can reduce the overall size of the motor on the premise of ensuring the rotational inertia.
Description
Technical Field
The invention relates to the technical field of 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
The magnetic suspension bearing is a low-loss and high-performance bearing, and a rotating shaft (also called a rotor) in the motor is suspended through electromagnetic force of the magnetic suspension bearing, so that the rotating shaft and the bearing do not have mechanical contact and mechanical friction. The magnetic suspension motor rotor has the advantages of no mechanical abrasion, low energy consumption, small noise, long service life, no need of lubrication and sealing, no oil pollution and the like while realizing high rotation speed of the motor rotor, and the rotation speed of the magnetic suspension motor rotor is limited by the tensile strength of a rotor material, so that the circumferential speed of the magnetic suspension motor rotor can be very high, and the magnetic suspension motor rotor is widely applied to high-speed equipment.
The external rotor motor is opposite to the general motor, the rotor is outside, and the stator is inside. The rotor has the advantages of large moment of inertia, good heat dissipation, copper wire saving, fan blade and other loads, can be directly connected with the rotor, and meets the installation requirement of a small-size complete machine with 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 inventors have found that the prior art magnetic levitation motors are typically provided with at least two radial magnetic bearings and a pair of axial magnetic bearings for radial and axial positioning of the rotor, and the motor stator and rotor, resulting in a larger overall machine size at least in the axial direction.
Disclosure of Invention
The invention aims 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 technical problems that the magnetic suspension motor in the prior art is large in size at least in the axial direction and is not suitable for occasions with small space and large inertia. The technical effects that can be produced by the preferred technical solutions of the present invention are described in detail below.
In order to achieve the above purpose, the present invention provides the following technical solutions:
The invention provides a magnetic suspension bearing assembly, which comprises 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 being capable of providing electromagnetic force to the rotor assembly to maintain the rotor assembly in suspension and at least limiting displacement of the rotor assembly in its axial and radial directions.
In a preferred or alternative embodiment, the rotor assembly includes a rotor and a thrust disc fixedly connected to the rotor, the rotor is sleeved outside at least a portion of the section of the central shaft assembly, and at least a portion of the thrust disc is disposed in a void within the central shaft assembly.
In a preferred or alternative embodiment, the central shaft assembly includes an axial positioning assembly and a radial positioning assembly, the thrust disc includes an axial positioning portion disposed in a void in the axial positioning assembly and a radial positioning portion disposed in a void between the axial positioning assembly and the radial positioning assembly.
In a preferred or alternative embodiment, 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, the first axial iron core and the second axial iron core are sleeved and fixedly mounted on the mounting shaft and are arranged at intervals along the axial direction of the mounting shaft, and the axial positioning part of the thrust disc is arranged in a gap between the first axial iron core and the second axial iron core.
In a preferred or alternative embodiment, axial windings are wound within the first and second axial cores in a region proximate the axial location to provide axial electromagnetic force to the rotor assembly.
In a preferred or alternative embodiment, the axial windings provided in the first axial core and the second axial core are each wound in the circumferential direction of the mounting shaft.
In a preferred or alternative embodiment, the central shaft assembly further comprises a mounting shaft, the axial positioning assembly is fixedly mounted on the mounting shaft, the radial positioning assembly comprises a radial iron core, the radial iron core is sleeved and fixed on the mounting shaft, a gap exists between the radial iron core and the axial positioning assembly along the radial direction of the mounting shaft, and the radial positioning part of the thrust disc is arranged in the gap between the radial iron core and the axial positioning assembly.
In a preferred or alternative embodiment, radial windings are wound within the radial core to provide radial electromagnetic force to the rotor assembly.
In a preferred or alternative embodiment, radial windings provided within the radial core are wound in the axial direction of the mounting shaft.
In a preferred or alternative embodiment, the central shaft assembly further comprises a mounting shaft and a housing, the mounting shaft being fixedly connected to the housing.
The invention provides an outer rotor motor assembly, which comprises a motor stator assembly and a magnetic suspension bearing assembly provided by any technical scheme of the invention, wherein,
The motor stator assembly is fixedly connected with the central shaft assembly, the rotor assembly comprises a rotor and a thrust disc, the thrust disc is fixedly connected with the rotor, and the rotor is sleeved outside the motor stator assembly.
In a preferred or alternative embodiment, the motor stator assembly includes a stator core and a stator winding, the stator core being fixedly connected to the central shaft assembly, the stator winding being wound in the stator core along an axial direction of the central shaft assembly.
The motor provided by the invention comprises a motor body and the outer rotor motor assembly provided by any technical scheme of the invention.
Based on the technical scheme, the embodiment of the invention at least has the following technical effects:
The magnetic suspension bearing assembly comprises a central shaft assembly and a rotor assembly, wherein at least part of the rotor assembly is arranged in a gap in the central shaft assembly, the central shaft assembly can provide electromagnetic force for the rotor assembly to enable the rotor assembly to keep in suspension, mechanical abrasion of the rotor assembly in the rotating process can be avoided, energy consumption is low, noise is low, the electromagnetic force provided by the central shaft assembly for the rotor assembly can limit displacement of the rotor assembly in the axial direction and the radial direction, at least two radial magnetic bearings and a pair of axial magnetic bearings in the prior art are integrated on one magnetic suspension bearing assembly, at least the axial dimension is greatly saved under the condition of ensuring required inertia, the structure is more compact, and the magnetic suspension bearing assembly is more conveniently applied to motors with small space and large inertia.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an axial cross-sectional structure of an external rotor motor assembly provided by the invention;
FIG. 2 is a schematic cross-sectional view of an outer rotor motor assembly according to 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 an enlarged partial schematic view of FIG. 3;
FIG. 5 is a schematic illustration of the electromagnetic circuit of the axial positioning assembly shown in FIG. 2.
In the figure, 1, a central shaft assembly, 11, an axial positioning assembly, 111, a first axial iron core, 112, a second axial iron core, 113, an axial winding, 12, a radial positioning assembly, 121, a radial iron core, 122, a radial winding, 13, a mounting shaft, 14, a machine shell, 15, an axial air gap, 16, a radial air gap, 2, a rotor assembly, 21, a rotor, 22, a thrust disk, 221, an axial positioning part, 222, a radial positioning part, 3, a motor stator assembly, 31, a stator iron core, 32, a stator winding, 4 and a motor air gap.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, based on the examples herein, which are within the scope of the invention as defined by the claims, will be within the scope of the invention as defined by the claims.
The invention provides a magnetic suspension bearing assembly which has a compact structure and can reduce the axial size of the whole motor at least on the premise of ensuring the rotational inertia, an outer rotor motor assembly provided with the magnetic suspension bearing assembly and a motor provided with the outer rotor motor assembly.
The technical scheme provided by the invention is described in more detail below with reference to fig. 1-5.
As shown in fig. 1 to 5, the magnetic suspension bearing assembly provided by the invention comprises a central shaft assembly 1 and a rotor assembly 2, wherein,
The central shaft assembly 1 has a receiving space in which at least a portion of the rotor assembly 2 is disposed, the central shaft assembly 1 being capable of providing an electromagnetic force to the rotor assembly 2 to keep the rotor assembly 2 in suspension and at least being capable of limiting displacement of the rotor assembly 2 in its axial and radial directions.
The magnetic suspension bearing assembly comprises a central shaft assembly 1 and a rotor assembly 2, wherein at least part of the rotor assembly 2 is arranged in a gap in the central shaft assembly 1, the central shaft assembly 1 can provide electromagnetic force for the rotor assembly 2 to enable the rotor assembly 2 to keep in suspension, mechanical abrasion of the rotor assembly 2 in the rotating process can be avoided, energy consumption is low, noise is low, the electromagnetic force provided by the central shaft assembly 1 for the rotor assembly 2 can limit displacement of the rotor assembly 2 in the axial direction and the radial direction, at least two radial magnetic bearings and a pair of axial magnetic bearings in the prior art are integrated on one magnetic suspension bearing assembly, at least the axial dimension is greatly saved under the condition of ensuring required inertia, the structure is more compact, and the magnetic suspension bearing assembly is more conveniently applied to a motor with small space and large inertia.
As a preferred or alternative embodiment, the rotor assembly 2 comprises a rotor 21 and a thrust disc 22, the thrust disc 22 being fixedly connected to the rotor 21, the rotor 21 being sleeved outside at least a part of the section of the central shaft assembly 1, the thrust disc 22 being at least partially arranged in a gap in the central shaft assembly 1.
Specifically, the thrust disc 22 and the rotor 21 may be fixed by welding or bolting, and at least a part of the section of the thrust disc 22 is disposed in the gap of the central shaft assembly 1 due to the fixed connection between the rotor 21 and the thrust disc 22, and the central shaft assembly 1 may provide electromagnetic force for the thrust disc 22 to suspend the thrust disc 22 and limit the axial and radial displacement thereof, thereby suspending the rotor 21 and limiting the axial and radial displacement of the rotor 21.
As a preferred or alternative embodiment, the central shaft assembly 1 comprises an axial positioning assembly 11 and a radial positioning assembly 12, the thrust disc 22 comprises an axial positioning portion 221 and a radial positioning portion 222, the axial positioning portion 221 is disposed in a space in the axial positioning assembly 11, and the radial positioning portion 222 is disposed in a space between the axial positioning assembly 11 and the radial positioning assembly 12.
Specifically, the axial positioning part 221 is disposed in a gap in the axial positioning component 11, the axial positioning component 11 provides axial electromagnetic force to the axial positioning part 221, the axial positioning part 221 is a stress part of the rotor component 2 in the axial direction, so that the rotor component 2 is suspended in the axial direction and realizes axial positioning, the radial positioning part 222 is disposed in a gap between the axial positioning component 11 and the radial positioning component 12, the radial positioning component 12 provides radial electromagnetic force to the radial positioning part 222, the radial positioning part 222 is a stress part of the rotor component 2 in the radial direction, so that the rotor component 2 is suspended in the radial direction and realizes radial positioning, and the suspension function and the radial and axial positioning functions are integrated on one thrust disc 22, so that the volume of the magnetic suspension bearing component is greatly reduced.
As a preferred or alternative embodiment, the central shaft assembly 1 further comprises a mounting shaft 13, the axial positioning assembly 11 comprises a first axial core 111 and a second axial core 112, the first axial core 111 and the second axial core 112 are both sleeved and fixedly mounted on the mounting shaft 13 and are arranged at intervals along the axial direction of the mounting shaft 13, and the axial positioning portion 221 of the thrust disc 22 is arranged in a gap between the first axial core 111 and the second axial core 112.
As a preferred or alternative embodiment, the axial windings 113 are wound around the areas of the first and second axial cores 111 and 112 near the axial positioning portion 221, which can provide axial electromagnetic force to the rotor assembly 2.
Specifically, the first axial iron core 111 and the second axial iron core 112 are made of magnetically-conductive soft magnetic materials, such as 45 # steel, the first axial iron core 111, the second axial iron core 112 and the mounting shaft 13 are in interference fit connection, the first axial iron core 111 and the second axial iron core 112 are arranged along the axial direction of the mounting shaft 13 at intervals, the axial positioning part 221 is arranged in a gap between the first axial iron core 111 and the second axial iron core 112, the axial winding 113 is wound in the first axial iron core 111 and the second axial iron core 112, as shown in fig. 5, after current is introduced, an electromagnetic field forms a magnetic flux loop among the first axial iron core 111, the second axial iron core 112, the axial air gap 15 and the thrust disc 22, electromagnetic force can be provided for the axial positioning part 221, at the moment, the current directions of the axial winding 113 introduced into the first axial iron core 111 and the second axial iron core 112 are opposite, and therefore opposite electromagnetic forces can be generated, and the magnitude of current in the different axial windings 113 is regulated, so that the axial positioning part 221 is suspended in the gap between the first axial iron core 111 and the second axial iron core 112, axial suspension and positioning are realized, and positioning are performed, and positioning precision is higher.
As a preferred or alternative embodiment, the axial windings 113 provided in the first axial core 111 and the second axial core 112 are each wound in the circumferential direction of the mounting shaft 13.
As a preferred or alternative embodiment, the central shaft assembly 1 further comprises a mounting shaft 13, the axial positioning assembly 11 is fixedly mounted on the mounting shaft 13, the radial positioning assembly 12 comprises a radial iron core 121, the radial iron core 121 is sleeved and fixed on the mounting shaft 13, a gap exists between the radial iron core 121 and the axial positioning assembly 11 along the radial direction of the mounting shaft 13, and a radial positioning portion 222 of the thrust disc 22 is arranged in the gap between the radial iron core 121 and the axial positioning assembly 11.
As a preferred or alternative embodiment, radial windings 122 are wound within radial core 121 to provide radial electromagnetic force to rotor assembly 2.
The radial iron core 121 is composed of silicon steel sheet lamination with strong magnetic permeability, the lamination mode is favorable for reducing eddy current loss and improving efficiency, interference fit connection is adopted between the radial iron core 121 and the mounting shaft 13, radial windings 122 are wound in the radial iron core 121, as shown in fig. 3-4, after current is introduced, a magnetic flux loop is formed among the radial iron core 121, the radial air gap 16 and the thrust disc 22 by an electromagnetic field, radial electromagnetic force is generated for the radial positioning part 222, the radial positioning part 222 is suspended in a gap between the radial iron core 121 and the axial positioning assembly 11, radial suspension and positioning are realized, positioning is performed by electromagnetic force, positioning accuracy is higher, and the coaxiality of the magnetic suspension bearing assembly is further favorable due to the fact that the axial dimension is reduced.
As a preferred or alternative embodiment, radial windings 122 provided in the radial cores 121 are wound in the axial direction of the mounting shaft 13.
Specifically, the axial windings 113 and the radial windings 122 are each wound from enameled wire.
As a preferred or alternative embodiment, the central shaft assembly 1 further comprises a mounting shaft 13 and a housing 14, the mounting shaft 13 being fixedly connected to the housing 14.
Specifically, the installation shaft 13 is in interference fit connection with the casing 14, the installation shaft plays a basic fixing role, the rotor 21 is of a shell-shaped structure, the casing 14 can cover the opening of the rotor 21, the axial positioning assembly 11 and the radial positioning assembly 12 are wrapped in a space formed in the casing, the rotor 21 can play a role of an output shaft, meanwhile, internal parts can be protected, integration is further achieved, the structure is more compact, and the size is reduced.
The invention provides an outer rotor motor assembly, which comprises a motor stator assembly 3 and a magnetic suspension bearing assembly provided by any technical scheme of the invention, wherein,
The motor stator assembly 3 is fixedly connected with the central shaft assembly 1, the rotor assembly 2 comprises a rotor 21 and a thrust disc 22, the thrust disc 22 is fixedly connected with the rotor 21, and the rotor 21 is sleeved outside the motor stator assembly 3.
The invention sets the rotor 21 at the outer periphery of the motor stator component 3, the magnetic pole outer periphery of the outer periphery is bigger, the magnetic pole area of the outer periphery is bigger under the same volume and the same current, the output electromagnetic force is bigger, the power is bigger, the rotor 21 is set at the outer periphery, the radius of the rotor 21 is bigger, the rotation radius is bigger, the inertia is bigger under the same mass.
As a preferred or alternative embodiment, the motor stator assembly 3 includes a stator core 31 and a stator winding 32, the stator core 31 is fixedly connected with the central shaft assembly 1, and the stator winding 32 is wound in the stator core 31 along the axial direction of the central shaft assembly 1.
Specifically, the stator core 31 is formed by lamination of silicon chips with strong magnetic permeability, the lamination mode is beneficial to reducing eddy current loss and improving efficiency, and the stator winding 32 is formed by winding enamelled wires, and the enamelled wires are wound in the stator core 31 to provide a rotating electromagnetic field. In addition, since the rotor 21 is disposed at the outer periphery of the motor stator assembly 3, the area of the outer periphery is large with respect to the inner rotor motor at the same volume, and the required enamel wire is relatively small when the equivalent electromagnetic force is output, so that the enamel wire can be saved.
As shown in fig. 3 to 4, after current is applied, the electromagnetic field forms a magnetic flux circuit between the stator core 31, the motor air gap 4, and the rotor 21, thereby realizing the rotation of the rotor 21 in the circumferential direction.
The motor provided by the invention comprises a motor body and the outer rotor motor assembly provided by any technical scheme of the invention.
Specifically, the casing 14 in the outer rotor motor unit may be a rear casing of the motor, and the rotor 21 may be directly used as an output shaft and connected to loads such as fan blades.
Any of the above-described embodiments of the present invention disclosed herein, unless otherwise indicated, if they disclose a range of values, then the disclosed range of values is a preferred range of values, and any person skilled in the art will appreciate that the preferred range of values is merely a relatively obvious or representative value of many possible values. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the invention, and the numerical values listed above should not limit the protection scope of the invention.
If the terms "first," "second," and the like are used herein to define a component, those skilled in the art will recognize that the use of "first," "second," and the like is merely for descriptive purposes and is not intended to have any special meaning unless otherwise indicated.
Meanwhile, if the above invention discloses or relates to components or structural members fixedly connected with each other, the fixed connection can be understood as being detachably fixed connection (such as using bolts or screws), or can be understood as being non-detachably fixed connection (such as riveting and welding), and of course, the fixed connection can be formed as a whole (such as integrally formed by casting instead of integrally forming obviously, unless integrally forming is adopted).
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated. Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the specific embodiments of the present invention may be modified or some technical features may be equivalently replaced, and they are all included in the scope of the technical solution of the present invention as claimed.
Claims (9)
1. A magnetic suspension bearing assembly is characterized by comprising 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 being capable of providing electromagnetic force to the rotor assembly to maintain the rotor assembly in suspension and at least limiting displacement of the rotor assembly in its axial and radial directions;
The rotor assembly comprises a rotor and a thrust disc, the thrust disc is fixedly connected with the rotor, the rotor is sleeved outside at least part of the section of the central shaft assembly, and at least part of the section of the thrust disc is arranged in a gap in the central shaft assembly;
The central shaft assembly comprises an axial positioning assembly and a radial positioning assembly, the thrust disc comprises an axial positioning part and a radial positioning part, the axial positioning part is arranged in a gap in the axial positioning assembly, and the radial positioning part is arranged in the gap between the axial positioning assembly and the radial positioning assembly;
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, the first axial iron core and the second axial iron core are sleeved and fixedly mounted on the mounting shaft and are arranged at intervals along the axial direction of the mounting shaft, and the axial positioning part of the thrust disc is arranged in a gap between the first axial iron core and the second axial iron core;
The axial positioning assembly is fixedly arranged on the mounting shaft, the radial positioning assembly comprises a radial iron core, the radial iron core is sleeved and fixed on the mounting shaft, a gap exists between the radial iron core and the axial positioning assembly along the radial direction of the mounting shaft, and the radial positioning part of the thrust disc is arranged in the gap between the radial iron core and the axial positioning assembly.
2. The magnetic suspension bearing assembly of claim 1, wherein an axial winding is wound within the first and second axial cores proximate the axial location to provide an axial electromagnetic force to the rotor assembly.
3. The magnetic bearing assembly of claim 2, wherein the axial windings disposed within the first and second axial cores are each wound circumferentially about the mounting shaft.
4. The magnetic bearing assembly of claim 1, wherein the radial core has radial windings wound therein to provide radial electromagnetic force to the rotor assembly.
5. The magnetic bearing assembly of claim 2, wherein radial windings disposed within the radial cores are wound axially of the mounting shaft.
6. The magnetic bearing assembly of claim 1, wherein the central shaft assembly further comprises a mounting shaft and a housing, the mounting shaft being fixedly coupled to the housing.
7. An external rotor motor assembly, which is characterized by comprising a motor stator assembly and the magnetic suspension bearing assembly as claimed in any one of claims 1-6, wherein,
The motor stator assembly is fixedly connected with the central shaft assembly, the rotor assembly comprises a rotor and a thrust disc, the thrust disc is fixedly connected with the rotor, and the rotor is sleeved outside the motor stator assembly.
8. The external rotor motor assembly of claim 7, wherein the motor stator assembly comprises a stator core and a stator winding, the stator core being fixedly connected to the central shaft assembly, the stator winding being wound within the stator core in an axial direction of the central shaft assembly.
9. An electric motor comprising a motor body and an outer rotor motor assembly according to any one of claims 7-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035511.2A CN111102292B (en) | 2020-01-14 | 2020-01-14 | Magnetic bearing assembly, outer rotor motor assembly and motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010035511.2A CN111102292B (en) | 2020-01-14 | 2020-01-14 | Magnetic bearing assembly, outer rotor motor assembly and motor |
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| Publication Number | Publication Date |
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| CN111102292A CN111102292A (en) | 2020-05-05 |
| CN111102292B true CN111102292B (en) | 2025-03-11 |
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| CN112003418B (en) * | 2020-08-20 | 2021-07-27 | 珠海格力电器股份有限公司 | Magnetic suspension bearing, assembling method thereof and motor |
| CN118088578B (en) * | 2024-03-05 | 2025-02-07 | 江苏科技大学 | A magnetic bearing structure for a composite material shaft and an assembly method thereof |
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| CN211737763U (en) * | 2020-01-14 | 2020-10-23 | 珠海格力电器股份有限公司 | Magnetic suspension bearing assembly, outer rotor motor assembly and motor |
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| CN104265571B (en) * | 2014-09-01 | 2017-01-25 | 江苏大学 | Inner rotor five-freedom-degree magnetic suspension vertical axis wind turbine |
| CN108930715B (en) * | 2018-10-10 | 2020-06-19 | 杭州江河水电科技有限公司 | Bidirectional adjacent coprime magnetic force and roller hybrid thrust bearing system |
| CN110454500B (en) * | 2019-07-19 | 2020-06-30 | 南京航空航天大学 | Magnetic suspension hub bearing and its magnetic force control method |
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| CN101936338A (en) * | 2009-06-25 | 2011-01-05 | 吴小平 | Micro magnetic pole permanent magnetic suspension bearing |
| CN211737763U (en) * | 2020-01-14 | 2020-10-23 | 珠海格力电器股份有限公司 | Magnetic suspension bearing assembly, outer rotor motor assembly and motor |
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