CN112787443A - First magnetic steel built-in rotor applied to axial flux motor - Google Patents
First magnetic steel built-in rotor applied to axial flux motor Download PDFInfo
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- CN112787443A CN112787443A CN202110118122.0A CN202110118122A CN112787443A CN 112787443 A CN112787443 A CN 112787443A CN 202110118122 A CN202110118122 A CN 202110118122A CN 112787443 A CN112787443 A CN 112787443A
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- back iron
- rotor
- magnetic
- rotor back
- magnetic steel
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 65
- 239000010959 steel Substances 0.000 title claims abstract description 65
- 230000004907 flux Effects 0.000 title claims abstract description 29
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 178
- 229910052742 iron Inorganic materials 0.000 claims abstract description 89
- 230000005389 magnetism Effects 0.000 claims abstract description 16
- 238000004804 winding Methods 0.000 claims abstract description 6
- 230000033001 locomotion Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 4
- 230000035699 permeability Effects 0.000 claims description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
- 230000005347 demagnetization Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000009977 dual effect Effects 0.000 description 4
- 230000003313 weakening effect Effects 0.000 description 3
- 238000000638 solvent extraction Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002356 single layer Substances 0.000 description 1
Images
Classifications
-
- 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
- H02K1/2793—Rotors axially facing stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/02—Machines with one stator and two or more rotors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K16/00—Machines with more than one rotor or stator
- H02K16/04—Machines with one rotor and two stators
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention provides a first magnetic steel built-in rotor applied to an axial flux motor. And a first back iron and a second back iron are designed on two sides of the first magnetic steel of the radial block. The first magnetic steel, the first back iron and the second back iron are fastened through screws and then connected with the first main shaft through splines. Radial magnetism isolating grooves are designed on two sides of the first back iron and the second back iron on the end face of the first magnetic steel of each pole, and axial fans and bearings are designed on two sides of the back iron. The axial flux motor adopting the first magnetic steel built-in rotor has one of the advantages that the weak magnetic speed regulation in a wider range can be realized, and the motor can be designed according to the full bus voltage at a rated rotating speed point, so that the winding current is reduced, and the copper consumption of the winding is reduced; the second advantage is that the magnetic field that armature reaction produced mainly passes through first back iron and second back iron to reduce first magnet steel eddy current loss, weakened the demagnetization risk.
Description
Technical Field
The invention relates to a motor applied to the fields of pure electric/hybrid electric vehicles, oil drilling and production and large unmanned aerial vehicles, in particular to a first magnetic steel built-in rotor applied to an axial flux motor.
Background
Although the magnetic steel built-in rotor is widely applied to a radial flux motor due to excellent flux weakening and speed expanding capability, the conventional axial flux motor generally adopts a magnetic steel surface-mounted rotor, high air gap flux density and high output torque can be obtained, but the harmonic waves of an armature magnetic field are easy to generate eddy current loss on the surface of the magnetic steel, and the surface-mounted rotor is in a surface-mounted topology, has a very limited flux weakening speed regulation range, and is limited in the application of the surface-mounted axial flux motor in a high-speed application occasion.
Patent 1(CN105515242A) and patent 2(CN105703508A) propose a magnetic steel built-in disc motor rotor, which is applied to a double-stator/single-rotor topology and a single-stator/double-rotor topology, respectively. The magnetic steel is internally installed by arranging the main magnetic pole and the leakage magnetic pole on two sides of the magnetic steel. The magnetic field of the armature is mainly distributed on the main magnetic pole and the leakage magnetic pole, and hardly passes through the magnetic steel, so that the eddy current loss of the magnetic steel is reduced. The rotor support is made of non-magnetic material, and the magnetic conductivity of the rotor support is almost equal to that of the magnetic steel and the alternating/direct axis inductance, so that the weak magnetic capacity of the motor is limited; only a single-layer air magnetic barrier is designed between the main magnetic pole and the leakage magnetic pole, and the leakage magnetic flux is large.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention adopts the technical scheme that: the magnetic steel built-in rotor applied to the axial flux motor is provided.
The technical scheme adopted by the invention is as follows: a magnetic steel built-in rotor applied to an axial flux motor adopts a double-stator/single-rotor topology and 24-slot 8-pole distributed winding layout. And a first rotor back iron and a second rotor back iron are designed on two sides of the first magnetic steel of the radial block. The first magnetic steel, the first rotor back iron and the second rotor back iron are fastened through screws and then connected with the first main shaft through splines. The first rotor back iron and the second rotor back iron are provided with multiple layers of radial magnetism isolating grooves on two sides of the end face of the first magnetic steel of each pole, and axial flow fans and bearings are arranged on two sides of the back iron and fixed on the first main shaft.
Furthermore, the first rotor back iron and the second rotor back iron are designed to be No. 10 or No. 20 conductive first magnetic steels, three magnetism isolating air grooves are respectively designed at the positions of the adjacent first magnetic steels with different polarities, and the magnetism isolating grooves penetrate through the first rotor back iron and the second rotor back iron. The inner circumferences of the first rotor back iron and the second rotor back iron are designed with non-through fan-shaped grooves.
Furthermore, the outer circumference of the first magnetic steel of each pole is provided with a non-magnetic stop block which is combined with the rabbets of the first rotor back iron and the second back iron and used for limiting the radial movement of the first magnetic steel.
The axial magnetic flux motor adopting the first magnetic steel built-in rotor has the beneficial effects that: one of the advantages is that the weak magnetic speed regulation in a wider range can be realized, and at a rated rotating speed point, the motor can be designed according to full bus voltage, so that the winding current is reduced, and the copper consumption of the winding is reduced; the second advantage is that the magnetic field that the armature reaction produced mainly passes through first rotor back iron and second rotor back iron, and first magnet steel adopts radial partitioning design, has reduced first magnet steel eddy current loss, has weakened first magnet steel demagnetization risk, and the heat that the rotor back iron produced has improved the convection heat transfer coefficient of rotor back iron terminal surface under axial fan effect to the temperature rise of rotor back iron and first magnet steel has been reduced. The third advantage is that first rotor back iron and second rotor back iron have designed the multilayer air at the both sides position of every utmost point and have separated the magnetic groove, have reduced the magnetic leakage, have improved air gap magnetic density and no-load back electromotive force.
Drawings
Fig. 1 is an exploded view of a first magnetic steel built-in rotor of an axial flux electric machine of the present invention. The bearing comprises a first bearing 1 and a second bearing 8, a first axial flow fan 2 and a second axial flow fan 7, a first main shaft 3, a first rotor back iron 4, a non-through fan-shaped groove 4d, a fan-shaped groove 4e, first magnetic steel 5, a second rotor back iron 6, a fan-shaped groove 6e, a first shaft retainer ring 9 and a first shaft retainer ring 10, a second shaft retainer ring 11, a screw and a non-magnetic retainer block 12.
Fig. 2 is a cross-sectional view of a first magnetic steel built-in rotor of the axial flux motor of the present invention, wherein 4f is a first rotor back iron spigot and 6f is a second rotor back iron spigot.
Fig. 3 is a structure diagram of an effective magnetic circuit of a first magnetic steel built-in rotor of the axial flux motor of the present invention.
Fig. 4 is a structural diagram of a first rotor back iron 4 of the present invention, wherein 4 is the first rotor back iron, 4a is a boss, 4b is a magnetic isolation air slot, 4c is a magnetic conduction rib plate, and 4d is a spline.
Fig. 5 is a structure diagram of a second rotor back iron 6 of the present invention, wherein 6 is the second rotor back iron, 6a is a concave table, 6b is a magnetic isolation air groove, 6c is a magnetic conduction rib plate, and 6d is a spline.
Fig. 6 is an exploded view of a dual rotor topology of the present invention applied to a single stator/dual rotor axial flux machine. 13 is a third rotor back iron, 22 is a fourth rotor back iron, 14 is a second magnetic steel, 21 is a third magnetic steel, 17 is a second main shaft, 15 is a third bearing, 16 is a fourth bearing, 19 is a fifth bearing, 20 is a sixth bearing, and 18 is a third axial flow fan.
Fig. 7 is a cross-sectional view of a dual rotor topology of a single stator/dual rotor axial flux machine of the present invention. 13a is a first boss, 13b is a second boss, 13c is a first air magnetism isolating groove, 13d is a second air magnetism isolating groove, and 13e is a third air magnetism isolating groove.
Fig. 8 is a structure diagram of a back iron of a third rotor of the single-stator/double-rotor axial flux motor of the present invention, where 13f is a third fan-shaped groove, 13g is a fourth fan-shaped groove, and 13h is a second spline.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings.
The first magnetic steel built-in rotor applied to the axial flux motor is characterized in that a first magnetic steel 5 is designed in a radial partitioning mode and is located between a first rotor back iron 4 and a second rotor back iron 6, and the first rotor back iron 4, the second rotor back iron 6, the first magnetic steel 5 and a non-magnetic stop block 12 are fixed together through screws 11. And a first axial fan 2, a first bearing 1, a second axial fan 7 and a second bearing 8 are respectively arranged on two sides of the first rotor back iron 4 and the second rotor back iron 6. The first rotor back iron 4 and the second rotor back iron 6 transmit torque with the first main shaft 3 through a spline pair; the axial limitation of the first axial fan 2 and the second axial fan 7 is realized by a first axial retainer ring 9 and a second axial retainer ring 10, respectively, as shown in fig. 1.
The first magnetic steel built-in rotor applied to the axial flux motor is characterized in that each magnetic pole of the first magnetic steel 5 is divided into four sections along the radial direction and used for weakening eddy current loss of the first magnetic steel. The first magnetic steel 5 limits the movement in the radial direction through the spigot 4f of the first rotor back iron 4 and the spigot 6f of the second rotor back iron 6, as shown in fig. 2. The rotor effective part of the first magnetic steel built-in rotor comprises a first rotor back iron 4, a second rotor back iron 6 and first magnetic steel 5, and the structure diagram of an effective magnetic circuit is shown in figure 3.
The boss 4a of the first rotor back iron 4 of the first magnetic steel built-in rotor is inserted into the concave-convex part 6a of the second rotor back iron 6, and meanwhile, the magnetic conduction rib plate 4c of the first rotor back iron 4 is attached to the magnetic conduction rib plate 6c of the second rotor back iron 6; three magnetism isolating air grooves are designed between adjacent first magnetic steels 5 with different polarities, and comprise magnetism isolating air grooves 4b of a first rotor back iron 4 and magnetism isolating air grooves 6b of a second rotor back iron 6, wherein the magnetism isolating air grooves 4b and the magnetism isolating air grooves 6b are aligned in the axial direction to form a through air cavity, and magnetic leakage of the first magnetic steels is mainly reduced. The splines 4d of the first rotor back iron 4 are aligned with the splines 6d of the second rotor back iron 6. The circular motion of the first magnetic steel 5 is restrained by the magnetic conduction rib plates 4c and the magnetic conduction rib plates 6 c. The sector-shaped grooves 4 of the first rotor back iron 4 and the sector-shaped grooves 6e of the second rotor back iron 6e mainly reduce the weight of the rotor, as shown in fig. 4 and 5.
The double rotor applied to the single-stator/double-rotor axial flux motor comprises a third rotor back iron 13, a fourth rotor back iron 22, a second magnetic steel 14 and a third magnetic steel 21. The third rotor back iron 13 and the fourth rotor back iron 22 have the same structure and are both made of magnetic permeability 20 steel or electrician pure iron DT 4. The third rotor back iron 13 is provided with a first boss 13a and a second boss 13b, and is positioned between the adjacent second magnetic steels to form a part of a quadrature magnetic circuit. The two sides of the first boss 13a and the second boss 13b are designed with a first air magnetism isolating groove 13c, a second air magnetism isolating groove 13d and a third air magnetism isolating groove 13e for reducing magnetic steel magnetic leakage. The second main shaft 17 is provided with a third bearing 15, a fourth bearing 16, a fifth bearing 19, a sixth bearing 20 and a third axial flow fan 18, wherein the third bearing 15 and the sixth bearing 20 are both deep groove ball bearings and bear radial force generated by rotation of a rotor, and the fourth bearing 16 and the fifth bearing 19 are both thrust ball bearings and bear axial force generated by unbalanced suction force on two sides. The third axial fan 18 is connected to the second main shaft 17 by a spline pair, as shown in fig. 6 and 7.
In order to reduce the weight of the back iron, the third rotor back iron 13 applied to the single-stator/double-rotor axial flux motor is designed with a third fan-shaped groove 13f and a fourth fan-shaped groove 13g, and the second main shaft 17 is connected with the third rotor back iron 13 through a second spline 13h, as shown in fig. 8.
While specific embodiments have been illustrated and described herein, it will be appreciated by those of ordinary skill in the art that a variety of alternate or equivalent implementations may be substituted for the specific embodiments shown and described without departing from the scope of the present invention. This application is intended to cover any adaptations or embodiments of the invention discussed herein. Therefore, it is intended that this invention be limited only by the claims and the equivalents thereof.
Claims (3)
1. The utility model provides a be applied to built-in rotor of magnet steel of axial flux motor which characterized in that: the axial flux motor adopts a double-stator/single-rotor topology and 24-slot 8-pole distributed winding layout, first rotor back iron and second rotor back iron are designed on two sides of radially partitioned first magnetic steel, the first rotor back iron and the second rotor back iron are fastened through screws and connected with a first main shaft through splines and used for limiting the axial movement of the first magnetic steel, penetrating radial magnetism isolating slots are designed on two sides of the end face of each first magnetic steel of each pole of the first rotor back iron and the second rotor back iron, and axial flow fans and bearings are designed on two sides of the first rotor back iron and the second rotor back iron and fixed on the first main shaft.
2. The magnetic steel built-in rotor applied to the axial flux motor as claimed in claim 1, wherein: the first rotor back iron and the second rotor back iron are designed into No. 10 or No. 20 magnetic permeability low-carbon steel, three communicated magnetic isolation air grooves are respectively designed at the positions of the adjacent first magnetic steels with different polarities, the magnetic isolation grooves penetrate through the first rotor back iron and the second rotor back iron, and non-communicated fan-shaped grooves are designed in the inner circumferences of the first rotor back iron and the second rotor back iron.
3. The magnetic steel built-in rotor applied to the axial flux motor as claimed in claim 1, wherein: the outer circumference of each first magnetic steel is provided with a non-magnetic-conductive stop block which is combined with a spigot of the first rotor back iron and the second back iron and a magnetic-conductive rib plate and used for limiting the radial and circumferential movement of the first magnetic steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110118122.0A CN112787443A (en) | 2021-01-28 | 2021-01-28 | First magnetic steel built-in rotor applied to axial flux motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110118122.0A CN112787443A (en) | 2021-01-28 | 2021-01-28 | First magnetic steel built-in rotor applied to axial flux motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112787443A true CN112787443A (en) | 2021-05-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110118122.0A Pending CN112787443A (en) | 2021-01-28 | 2021-01-28 | First magnetic steel built-in rotor applied to axial flux motor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112787443A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220077745A1 (en) * | 2019-01-15 | 2022-03-10 | Gkn Sinter Metals Engineering Gmbh | Electric Motor |
| DE102021105499A1 (en) | 2021-03-08 | 2022-09-08 | Liebherr-Aerospace Lindenberg Gmbh | Rotor for an axial flow machine |
| CN115566818A (en) * | 2022-10-18 | 2023-01-03 | 无锡星驱动力科技有限公司 | Stator core assembly, stator assembly and driving motor |
-
2021
- 2021-01-28 CN CN202110118122.0A patent/CN112787443A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20220077745A1 (en) * | 2019-01-15 | 2022-03-10 | Gkn Sinter Metals Engineering Gmbh | Electric Motor |
| DE102021105499A1 (en) | 2021-03-08 | 2022-09-08 | Liebherr-Aerospace Lindenberg Gmbh | Rotor for an axial flow machine |
| DE102021105499B4 (en) | 2021-03-08 | 2024-05-02 | Liebherr-Aerospace Lindenberg Gmbh | Rotor for an axial flow machine |
| CN115566818A (en) * | 2022-10-18 | 2023-01-03 | 无锡星驱动力科技有限公司 | Stator core assembly, stator assembly and driving motor |
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