CN116526792A - Outer rotor permanent magnet motor with composite air gap layer magnetic circuit - Google Patents
Outer rotor permanent magnet motor with composite air gap layer magnetic circuit Download PDFInfo
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- CN116526792A CN116526792A CN202310214457.1A CN202310214457A CN116526792A CN 116526792 A CN116526792 A CN 116526792A CN 202310214457 A CN202310214457 A CN 202310214457A CN 116526792 A CN116526792 A CN 116526792A
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- permanent magnet
- stator core
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- 230000005291 magnetic effect Effects 0.000 title claims abstract description 78
- 239000002131 composite material Substances 0.000 title claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 40
- 230000007704 transition Effects 0.000 claims abstract description 4
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- 229910000976 Electrical steel Inorganic materials 0.000 description 23
- 230000004907 flux Effects 0.000 description 5
- 230000035699 permeability Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010941 cobalt Substances 0.000 description 1
- 229910017052 cobalt Inorganic materials 0.000 description 1
- GUTLYIVDDKVIGB-UHFFFAOYSA-N cobalt atom Chemical compound [Co] GUTLYIVDDKVIGB-UHFFFAOYSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
- H02K21/021—Means for mechanical adjustment of the excitation flux
- H02K21/022—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator
- H02K21/025—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator by varying the thickness of the air gap between field and armature
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/16—Stator cores with slots for windings
- H02K1/165—Shape, form or location of the slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/27—Rotor cores with permanent magnets
- H02K1/2786—Outer rotors
- H02K1/2787—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/2789—Outer rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2791—Surface mounted magnets; Inset magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/02—Details
- H02K21/021—Means for mechanical adjustment of the excitation flux
- H02K21/022—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator
- H02K21/025—Means for mechanical adjustment of the excitation flux by modifying the relative position between field and armature, e.g. between rotor and stator by varying the thickness of the air gap between field and armature
- H02K21/026—Axial air gap machines
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/22—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating around the armatures, e.g. flywheel magnetos
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2201/00—Specific aspects not provided for in the other groups of this subclass relating to the magnetic circuits
- H02K2201/03—Machines characterised by aspects of the air-gap between rotor and stator
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/03—Machines characterised by numerical values, ranges, mathematical expressions or similar information
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/64—Electric machine technologies in electromobility
Abstract
The invention discloses an outer rotor permanent magnet motor with a composite air gap layer magnetic circuit, which belongs to the technical field of motors and comprises a stator connecting piece, a plurality of rotor connecting rings and an outer cover, wherein a plurality of rows of main stator iron cores and auxiliary stator iron cores are axially and alternately symmetrically arranged on the outer side of the stator connecting piece, and the rotor connecting rings are arranged between the adjacent main stator iron cores and auxiliary stator iron cores; a main coil is arranged on the periphery of the main stator core; a main rotor split block and a sub rotor split block matched with the main stator core and the sub stator core are respectively fixed on two sides of the rotor connecting ring; permanent magnets are fixed on the inner surface of the main rotor column block, and the main stator iron core is in clearance fit with the permanent magnets; the auxiliary stator iron core is in clearance fit with the auxiliary rotor split block; the rotor connecting ring is in transition fit with the outer cover; the rotor connecting ring or the outer cover is coaxially and rotatably connected with the stator connecting piece; the invention sets a single magnetic circuit structure for each permanent magnet and can improve the power density of the motor.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to an outer rotor permanent magnet motor with a composite air gap layer magnetic circuit.
Background
Permanent magnets of the permanent magnet outer rotor motor are generally installed on the outer rotor in a staggered mode, and adjacent permanent magnets are mutually high-reluctance sections in a magnetic circuit of the other side. The basis is that the permanent magnet has recovery magnetic permeability in a dynamic magnetic circuit in strict and Peng Xiaoling magnetic foundation and magnetic material, and Zhou Shouzeng and Dong Qingfei give that the recovery magnetic permeability of a general permanent magnet is 1.02-1.10 and is close to air in the monograph of superstrong permanent magnet-rare earth iron permanent magnet material. The magnetic permeability of the iron core is more than 5000 times of that of air, and the permanent magnet of the outer rotor motor with the general thickness of 4mm increases the magnetic resistance of a magnetic circuit of the adjacent permanent magnet, and magnetic lines of force return to the S pole of the permanent magnet through a path with larger magnetic resistance, so that the working point position of the permanent magnet is also deteriorated. The motor without permanent magnet to provide magnetic field has no problem, and the magnetic permeability of the iron core in the magnetic circuit is high, but the exciting current is needed to generate magnetic field, so that the motor has low efficiency and large heat productivity. The magnetic field provided by the permanent magnet does not need extra energy, but most permanent magnet outer rotor motors adopt a current excitation type motor structure, and have room for improvement.
The permanent magnets in the rotor at present are surface-mounted and embedded, the embedded permanent magnets are arranged in a rectangular shape along the chord length, two permanent magnets are arranged in a V shape, and three permanent magnets are arranged in a trapezoid shape, so that the purpose of the permanent magnets is to efficiently improve a magnetic field, low magnetic circuit magnetic resistance and high magnetic energy product working point magnetic circuit, but the permanent magnets do not break through a frame of a current excitation motor, namely an independent magnetic circuit structure is not arranged for each permanent magnet, and the power density is low.
Disclosure of Invention
The invention aims to solve the problems in the background art, and provides an outer rotor permanent magnet motor with a composite air gap layer magnetic circuit, which can avoid a high magnetic resistance part of a magnetic circuit of an opposite side of adjacent permanent magnets, is provided with an independent magnetic circuit structure for each permanent magnet, and improves the power density of the outer rotor permanent magnet motor.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
an outer rotor permanent magnet motor of a composite air gap layer magnetic circuit is characterized in that: the stator connecting piece comprises a stator connecting piece, a plurality of rotor connecting rings and an outer cover, wherein a plurality of rows of main stator iron cores and auxiliary stator iron cores are axially and alternately symmetrically arranged on the outer side of the stator connecting piece, the rotor connecting rings are arranged between the adjacent main stator iron cores and auxiliary stator iron cores, and the rotor connecting rings and the stator connecting piece are coaxially arranged; the main stator iron core is fixed on the connecting piece in an annular equidistant manner; a main coil is arranged on the periphery of the main stator core; a main rotor split block and a sub rotor split block which are matched with the main stator core and the sub stator core are respectively fixed on two sides of the rotor connecting ring, and the main rotor split block and the sub rotor split block are positioned on the radial outer sides of the main stator core and the sub stator core; a permanent magnet is fixed on the inner surface of the main rotor column block, and a first air gap layer is arranged between the main stator core and the permanent magnet; a second air gap layer is arranged between the auxiliary stator core and the auxiliary rotor split block; the rotor connecting ring, the main rotor split block and the auxiliary rotor split block are sleeved in the outer cover, and the rotor connecting ring is in transition fit with the outer cover; the rotor connecting ring or the outer cover is coaxially and rotatably connected with the stator connecting piece; all of the fittings, except the housing, are of ferromagnetic material.
Preferably, the shape of the permanent magnet is matched with the shape of the outer end part of the main stator core; the magnetic poles of adjacent permanent magnets are oppositely arranged.
Preferably, a sub-coil is mounted on the outer periphery of the sub-stator core.
Preferably, an extended auxiliary rotor split block is installed between the rotor connecting ring and the auxiliary rotor split block, and an axial air gap layer is arranged between the extended auxiliary rotor split block and the side surface of the auxiliary stator core.
Preferably, the inner surface of the main rotor column block is provided with a first groove matched with the permanent magnet, and the permanent magnet is embedded in the first groove.
Preferably, a second groove matched with the outer end of the auxiliary stator core is formed in the inner side of the auxiliary rotor row block, and a second air gap layer is arranged between the auxiliary stator core and the second groove.
Preferably, the outer diameter of the sub-stator core is 0.9 to 1.3 times the outer diameter of the main stator core.
Preferably, the spacing between adjacent main stator core side walls is 1.5mm-12mm.
Preferably, the spacing between the side walls of adjacent sub-stator cores is 1mm to 10mm.
Preferably, the outer side ends of the main stator core and the auxiliary stator core are provided with sectors coaxial with the stator connecting piece.
The beneficial effects of the invention are as follows:
1. by arranging the main stator core, the rotor connecting ring, the auxiliary stator core, the auxiliary rotor split blocks and the main rotor split blocks, an independent magnetic circuit structure is arranged for each permanent magnet, so that the fact that the permanent magnets are mutually large magnetic resistances in magnetic force of the other side when the rotors are arranged side by side is effectively avoided, the thickness of the permanent magnets is increased due to the structure, and the power density of the permanent magnet motor is improved.
2. The invention is provided with three air gap layers, the magnetic resistance of air is close to that of the permanent magnets, the permanent magnets are arranged side by side in the prior art, the thickness of the air gap layers is smaller than 0.5mm, the thickness of the general permanent magnets is more than 3mm, and the magnetic resistance of magnetic lines of force when passing through the air gap layers is much smaller than that when passing through the magnetic resistance when approaching the permanent magnets, so that the invention can obtain larger magnetic induction intensity at the air gap layers, namely the power density of the permanent magnet motor is improved.
3. Each permanent magnet is provided with an independent magnetic circuit, so that better working points on a demagnetizing curve can be obtained, and the magnetic energy product is higher, so that the demagnetizing risk is reduced.
4. An expansion auxiliary rotor split block is arranged between the rotor connecting ring and the auxiliary rotor split block, and an axial air gap layer is arranged between the expansion auxiliary rotor split block and the auxiliary stator core, so that the space of the radial position is effectively utilized, and the motor has higher power density.
Drawings
FIG. 1 is a schematic general construction of the present invention;
FIG. 2 is a schematic diagram of the relative positions of a main stator, a main rotor, a sub-stator and a sub-rotor in the present invention;
FIG. 3 is a schematic diagram of the relative positions of the magnetic circuit and the components in the present invention;
fig. 4 is a schematic structural view of a silicon steel sheet of a main stator core in the present invention;
FIG. 5 is a schematic view of the structure of a stator connecting piece silicon steel sheet in the present invention;
FIG. 6 is a schematic view of the structure of the silicon steel sheet of the secondary stator core of the present invention;
fig. 7 is a schematic structural view of a main rotor split block silicon steel sheet in the present invention.
List of reference numerals: 1. a stator connection; 2. a main stator core; 3. a permanent magnet; 4. a main rotor column block; 5. a rotor connecting ring; 6. sub rotor column blocks; 7. an outer cover; 8. a sub stator core; 9. a main coil; 10. a first air gap layer; 11. magnetic lines of force; 12. expanding sub rotor column blocks; 13. a second air gap layer; 14. an axial air gap layer; 15. a sub-coil;
16; silicon steel sheets of the main stator iron core; 17. a main stator core; 18. a first deep break groove; 19. a first connection ring; 20. stator connecting piece silicon steel sheet; 21. an outer circle; 22. an output shaft connection hole; 23. a secondary stator core silicon steel sheet; 24. a second deep break groove; 25. a second connecting ring; 26. the main rotor is divided into silicon steel sheets; 27. breaking the groove; 28. a mounting groove; 29. and (5) connecting strips.
Detailed Description
Embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
It should be noted that the terms like "upper", "lower", "left", "right", "front", "rear", and the like are also used for descriptive purposes only and are not intended to limit the scope of the invention in which the invention may be practiced, but rather the relative relationship of the terms may be altered or modified without materially altering the teachings of the invention.
The invention provides an outer rotor permanent magnet motor with a composite air gap layer magnetic circuit, which is shown in figure 1, and comprises a stator connecting piece 1, a rotor connecting ring 5 and an outer sleeve 7; the rotor connecting ring 5 is sleeved in the outer sleeve 7, and the rotor connecting ring and the outer sleeve are in transition fit;
the stator connecting piece 1 adopts a cylindrical shape (other shapes can be adopted, such as prismatic shape), the rotor connecting ring 5 is used as an outer ring of the bearing, the inner side of the rotor connecting ring is provided with balls and an inner ring of the bearing matched with the stator connecting piece 1, and the stator connecting piece 1 passes through the inner ring of the bearing to be coaxially and rotatably connected with the rotor connecting ring 5; or connecting shafts (note that the connecting shafts and the stator connecting pieces 1 are coaxial) are arranged at two ends of the stator connecting piece 1, inward radial extension surfaces are arranged at two ends of the outer sleeve 7, connecting holes matched with the connecting shafts are arranged in the middle of the extension surfaces, and the outer sleeve 7 and the stator connecting pieces 1 are coaxially and rotatably connected through the connecting shafts and the connecting holes; any other way can be adopted as long as the rotor connecting ring 5 or the outer sleeve 7 can be coaxially and rotatably connected with the stator connecting piece 1;
a plurality of rows of main stator iron cores 2 and auxiliary stator iron cores 8 are alternately and symmetrically arranged along the axial direction of the stator connecting piece 1, a rotor connecting ring 5 is arranged between the adjacent stator iron cores 2 and auxiliary stator iron cores 8, as shown in fig. 1, two rows of main stator iron cores 2 and one row of auxiliary stator iron cores 8 (more can be arranged according to actual requirements) are arranged in the embodiment, and one row of auxiliary stator iron cores 8 are arranged between the two rows of main stator iron cores 2, namely, are alternately arranged; the positions of the main stator core 2 and the auxiliary stator core 8 are symmetrically arranged; a rotor connecting ring 5 is arranged between the main stator core 2 and the auxiliary stator core 8;
the main stator iron core 2 is fixed on the stator connecting piece 1 in an annular equidistant manner; the auxiliary stator iron cores 8 are also fixed on the stator connecting piece 1 in annular equidistant mode because of symmetrical arrangement; because the main stator core 2 or the sub stator core 8 are arranged at intervals, the magnetic resistance between two adjacent core poles of the main stator core 2 or the sub stator core 8 is increased, so that the magnetic force lines 11 of the permanent magnets 3 (which will be described later) do not easily pass through the adjacent main stator core 2 or the adjacent sub stator core 8, and the magnetic force lines 11 of each permanent magnet 3 can pass through the independent main stator core 2 and sub stator core 8;
a main coil 9 is arranged on the periphery of the main stator core 2; a main rotor split block 4 and a sub rotor split block 6 which are matched with the main stator core 2 and the sub stator core 8 are respectively fixed at two sides of the rotor connecting ring 5, and the main rotor split block 4 and the sub rotor split block 6 are positioned at the radial outer sides of the main stator core 2 and the sub stator core 8; namely, a main rotor split block 4 is arranged on the periphery of the main stator core 2, the main rotor split block 4 is fixed on one side of a rotor connecting ring 5, and auxiliary rotor split blocks 6 are symmetrically fixed on the other side of the rotor connecting ring 5;
the inner side of each main rotor column block 4 is provided with a permanent magnet 3, the inner surface of each main rotor column block 4 is provided with a first groove matched with the permanent magnet 3, and the permanent magnets 3 are embedded in the first grooves (other modes can be adopted to fix the permanent magnets 3 on the inner surface of the main rotor column block 4, such as glue or bolts, and the like); the permanent magnet 3 may or may not be in a shape matching the shape of the outer end of the main stator core 2; the magnetic poles of the adjacent permanent magnets 3 are oppositely arranged, so that the influence between the adjacent permanent magnets 3 is reduced;
the magnetic resistance between the two split blocks of each main rotor split block 4 and the auxiliary rotor split block 6 is very large due to the fact that a large air gap layer is specially arranged between the two split blocks, so that the magnetic flux lines 11 of the permanent magnets 3 can pass through the inside of the rotor connecting ring 5 instead of directly passing through the air gap layer between the two split blocks;
the outer cover 7 is coaxially attached to the main rotor split block 4, the rotor connecting ring 5 and the auxiliary rotor split block 6;
all components except the housing 7 are of ferromagnetic material such as iron, cobalt or nickel.
As shown in fig. 2, the positional relationship among the stator connection 1, the main stator core 2, the permanent magnets 3, the main rotor split block 4, the sub rotor split block 6, and the sub stator core 8 is more clearly explained, and fig. 2 expresses the positional relationship therebetween from another angle;
wherein the inner side surface of the auxiliary rotor split block 6 is preferably provided with a second groove matched with the outer end of the auxiliary stator core 8 (the second groove is not required to be arranged), and a second air gap layer 13 is arranged between the second groove and the outer end of the auxiliary stator core 8, so that the area of the second air gap layer 13 is larger (compared with the case of not arranging the second groove);
the outer ends of the main stator core 2 and the sub stator core 8 may be provided with a sector piece (or arc piece) coaxial with the stator connection member 1, thereby increasing magnetic flux, or may not be provided.
As shown in fig. 3, for more clearly explaining the magnetic structure, fig. 3 focuses on the path of the magnetic lines of force, while the figure shows another preferred embodiment, namely, an expanded sub-rotor split block 12 is provided between the sub-rotor split block 6 and the rotor connecting ring 5; an axial air gap layer 14 is arranged between the expansion auxiliary rotor split block 12 and the auxiliary stator core 8;
the magnetic force lines 11 emitted by the permanent magnets 3 sequentially pass through the first air gap layer 10, the main stator core 2, the stator connecting piece 1 and the auxiliary stator core 8; a part of magnetic force lines in the auxiliary stator core 8 sequentially pass through the second air gap layer 13 and enter the auxiliary rotor split block 6, the magnetic force at the second air gap layer 13 has a larger force arm, the other part of magnetic force lines in the auxiliary stator core 8 passes through the axial air gap layer 14 and enters the extended auxiliary rotor split block 12, the magnetic force at the axial air gap layer 14 effectively utilizes the space at the radial position so that the motor has higher power density, and the magnetic force lines 11 sequentially enter the rotor connecting ring 5 and the main rotor split block 4 through the auxiliary rotor split block 6 and the extended auxiliary rotor split block 12 and return to the other magnetic pole of the permanent magnet 3;
the main coil 9 is mounted on the outer periphery of the main stator core 2, and the auxiliary coil 15 may or may not be mounted on the outer periphery of the auxiliary stator core 8.
Fig. 4 shows a structural scheme of stacking silicon steel sheets of the main stator core 2 (other schemes can be adopted, such as direct integral molding), namely, the main stator core 2 is formed by stacking a plurality of silicon steel sheets 16 of the main stator core, and the silicon steel sheets 16 of the main stator core comprise a plurality of main stator cores 17, a plurality of first deep breaking grooves 18 and a first connecting ring 19; the stator iron cores 17 are connected to the first connecting ring 19 in annular equidistant mode, and a first deep break groove 18 is formed between adjacent stator iron cores 17; the surface of each main stator iron core silicon steel sheet 16 is provided with a plurality of through holes, and the main stator iron core silicon steel sheets 16 can be connected into a whole through connecting columns;
the first connecting ring 19 is cut off after being fixedly mounted with the stator connecting piece 1, the first connecting ring 19 is cut off, the magnetic resistance between the two main stator cores 17 is large, so that the magnetic flux between the two main stator cores 17 is greatly reduced, the magnetic flux is mainly conducted to the corresponding part of the auxiliary stator core 8 through the stator connecting piece 1, and the width dimension of the first deep breaking groove 18 (namely, the spacing groove of the adjacent main stator cores) is preferably 1.5mm-12mm.
As shown in fig. 5, the structure scheme of the stator connecting piece 1 with the silicon steel sheets stacked (other schemes, such as direct integral molding, can be adopted), the stator connecting piece 1 is formed by stacking the silicon steel sheets 20 of the stator connecting piece, the silicon steel sheets 20 of the stator connecting piece comprise an outer circle 21 and an output shaft connecting hole 22, and the output shaft connecting hole 22 is positioned at the center of the outer circle 21 and is concentric with the outer circle 21; the surface of each stator connecting piece 1 is provided with a plurality of through holes, and the stator connecting pieces 1 can be connected into a whole through connecting columns;
the outer circumference 21 is covered by the first deep break groove 18 to reduce magnetic resistance, so that magnetic flux is conducted from the main stator core 17 to the corresponding part of the sub stator core 8 as much as possible, and the width dimension of the second deep break groove 24 is preferably 1mm-10mm.
As shown in fig. 6, the stacked silicon steel sheet structure scheme of the auxiliary rotor split block 6 (other schemes, such as direct integral molding, may be adopted), the auxiliary rotor split block 6 is formed by stacking auxiliary stator core silicon steel sheets 23, the auxiliary stator core silicon steel sheets 23 include auxiliary stator cores, second deep breaking grooves 24 and second connecting rings 25, the auxiliary stator cores are annularly and equidistantly distributed on the second connecting rings 25, and the second deep breaking grooves 24 are formed between adjacent auxiliary stator core rings;
the outer end of the auxiliary stator core is provided with an arc-shaped sheet concentric with the second connecting ring 25, and the radial thickness dimension of the arc-shaped sheet is larger than that of the arc-shaped sheet at the outer end of the main stator core;
the outer diameter of the auxiliary stator core is preferably 0.9-1.3 times of the outer diameter of the main stator core 2; increasing the outer diameter of the sub-stator core increases the axial air gap layer 14 area and the moment arm of the magnetic force at the second air gap layer 13, thereby increasing the output torque, so the outer diameter of the sub-stator core is as large as possible.
As shown in fig. 7, the stacked silicon steel sheet structure scheme of the main rotor split block 4 (other schemes, such as direct integral forming, may be adopted), the main rotor split block 4 is formed by stacking main rotor split block silicon steel sheets 26, the main rotor split block silicon steel sheets 26 include breaking grooves 27, mounting grooves 28 and connecting strips 29, the main rotor split block silicon steel sheets 26 are ring sheets, a plurality of breaking grooves 27 are distributed on the inner side and the outer side of the ring sheets at equal intervals in a ring shape, and the connecting strips 29 are arranged in the middle of the breaking grooves 27 and are used for connecting the ring sheets on two sides of the breaking grooves 27; a plurality of mounting grooves 28 are formed in the inner side of the circular ring piece at equal intervals in an annular mode, and the mounting grooves 28 are matched with the permanent magnets 3 and are used for mounting the permanent magnets 3;
the connecting strip 29 is cut off after being fixedly mounted with the rotor connecting ring 5, and the structure of the mounting groove 28 can be used for any one of surface mounting of the sector permanent magnets, embedded rectangular permanent magnets, embedded V-shaped rectangular permanent magnets and embedded trapezoidal rectangular permanent magnets, and is correspondingly arranged according to the shape of the permanent magnets.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (10)
1. An outer rotor permanent magnet motor of a composite air gap layer magnetic circuit is characterized in that: the stator connecting piece (1) is axially and alternately symmetrically provided with a plurality of rows of main stator iron cores (2) and auxiliary stator iron cores (8), the rotor connecting rings (5) are arranged between the adjacent main stator iron cores (2) and auxiliary stator iron cores (8), and the rotor connecting rings (5) and the stator connecting piece (1) are coaxially arranged; the main stator iron core (2) is fixed on the connecting piece (1) at equal intervals in a ring shape; a main coil (9) is arranged on the periphery of the main stator core (2); a main rotor split block (4) and a sub-rotor split block (6) which are matched with the main stator core (2) and the sub-stator core (8) are respectively fixed on two sides of the rotor connecting ring (5), and the main rotor split block (4) and the sub-rotor split block (6) are positioned on the radial outer sides of the main stator core (2) and the sub-stator core (8); a permanent magnet (3) is fixed on the inner surface of the main rotor column block (4), and a first air gap layer (10) is arranged between the main stator iron core (2) and the permanent magnet (3); a second air gap layer (13) is arranged between the auxiliary stator core (8) and the auxiliary rotor split block (6); the rotor connecting ring (5), the main rotor split block (4) and the auxiliary rotor split block (6) are sleeved in the outer cover (7), and the rotor connecting ring (5) is in transition fit with the outer cover (7); the rotor connecting ring (5) or the outer cover (7) is coaxially and rotatably connected with the stator connecting piece (1); all the fittings, except the housing (7), are of ferromagnetic material.
2. An outer rotor permanent magnet motor of a composite air gap layer magnetic circuit as claimed in claim 1, wherein: the shape of the permanent magnet (3) is matched with the shape of the outer end part of the main stator core (2); the magnetic poles of the adjacent permanent magnets (3) are oppositely arranged.
3. An outer rotor permanent magnet motor of a composite air gap layer magnetic circuit as claimed in claim 1, wherein: and an auxiliary coil (15) is arranged on the periphery of the auxiliary stator core (8).
4. An outer rotor permanent magnet motor of a composite air gap layer magnetic circuit as claimed in claim 1, wherein: an expansion auxiliary rotor split block (12) is arranged between the rotor connecting ring (5) and the auxiliary rotor split block (6), and an axial air gap layer (14) is arranged between the expansion auxiliary rotor split block (12) and the side face of the auxiliary stator core (8).
5. An outer rotor permanent magnet motor of a composite air gap layer magnetic circuit as claimed in claim 1, wherein: the inner surface of the main rotor column dividing block (4) is provided with a first groove matched with the permanent magnet (3), and the permanent magnet (3) is embedded in the first groove.
6. An outer rotor permanent magnet motor of a composite air gap layer magnetic circuit as claimed in claim 1, wherein: the inner side of the auxiliary rotor column block (6) is provided with a second groove matched with the outer end of the auxiliary stator core (8), and a second air gap layer (13) is arranged between the auxiliary stator core (8) and the second groove.
7. An outer rotor permanent magnet motor of a composite air gap layer magnetic circuit as claimed in claim 1, wherein: the outer diameter of the auxiliary stator core (8) is 0.9-1.3 times of the outer diameter of the main stator core (2).
8. An outer rotor permanent magnet motor of a composite air gap layer magnetic circuit as claimed in claim 1, wherein: the spacing between the side walls of adjacent main stator iron cores (2) is 1.5mm-12mm.
9. An outer rotor permanent magnet motor of a composite air gap layer magnetic circuit as claimed in claim 1, wherein: the spacing between the side walls of adjacent auxiliary stator iron cores (8) is 1mm-10mm.
10. An outer rotor permanent magnet motor of a composite air gap layer magnetic circuit as claimed in claim 1, wherein: the outer side ends of the main stator core (2) and the auxiliary stator core (8) are provided with fan blades coaxial with the stator connecting piece (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310214457.1A CN116526792A (en) | 2023-03-08 | 2023-03-08 | Outer rotor permanent magnet motor with composite air gap layer magnetic circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310214457.1A CN116526792A (en) | 2023-03-08 | 2023-03-08 | Outer rotor permanent magnet motor with composite air gap layer magnetic circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116526792A true CN116526792A (en) | 2023-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310214457.1A Pending CN116526792A (en) | 2023-03-08 | 2023-03-08 | Outer rotor permanent magnet motor with composite air gap layer magnetic circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116526792A (en) |
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2023
- 2023-03-08 CN CN202310214457.1A patent/CN116526792A/en active Pending
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