CN113489184A - Magnetic gear composite motor with single-layer air gap - Google Patents
Magnetic gear composite motor with single-layer air gap Download PDFInfo
- Publication number
- CN113489184A CN113489184A CN202110764674.9A CN202110764674A CN113489184A CN 113489184 A CN113489184 A CN 113489184A CN 202110764674 A CN202110764674 A CN 202110764674A CN 113489184 A CN113489184 A CN 113489184A
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- Prior art keywords
- stator
- air gap
- magnetic
- rotor
- outer rotor
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- 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
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- 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
-
- 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
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
- Permanent Magnet Type Synchronous Machine (AREA)
Abstract
The invention relates to a single-layer air gap magnetic gear composite motor which comprises a shell, an outer rotor, permanent magnets and a stator, wherein the outer rotor is arranged on the outer side of the stator, a layer of air gap is formed between the outer rotor and the stator, the outer rotor comprises a rotor iron core and the permanent magnets which are uniformly distributed along the circumferential direction of the rotor and are magnetized in a tangential direction alternately, a plurality of spaced slots are uniformly distributed along the circumferential direction of the outer edge of the stator, stator teeth are arranged between the adjacent slots, and three-phase armature windings are symmetrically nested on the stator teeth so that the stator teeth can be used as magnetic pole adjusting blocks for modulating a magnetic field. The invention not only solves the defects of large using amount of multilayer air gap magnetic steel and complex structure of the magnetic gear composite motor, but also solves the problem of low torque density of the single-layer air gap magnetic gear composite motor through the magnetic concentration design of the rotor magnetic steel.
Description
Technical Field
The invention belongs to the field of low-speed direct-drive large-torque electric drive, and particularly relates to a single-layer air gap magnetic gear composite motor suitable for a large-inertia flywheel frequency modulation system.
Background
In the field of electric drives, in order to improve the power density of an electric drive system, a power system structure scheme that a high-speed motor is decelerated through a high-speed ratio gearbox is generally adopted, however, the mechanical gearbox realizes energy transmission through tooth meshing, and problems of mechanical noise, running-in, maintenance and the like inevitably occur. Therefore, the magnetic gear replaces a mechanical gear, and the magnetic gear and the motor are skillfully combined to form the magnetic gear composite motor with a compact structure, so that the magnetic gear composite motor is one of effective solutions which meet the requirements of high power density and low-speed operation in practical application.
As a new direct-drive motor solution, the direct-drive motor solution has received attention of scholars, and a plurality of forms of magnetic gear compound motors have been derived at present, including double layers or three layers in terms of air gap layer number, and including double rotors, single rotors and the like in terms of structure, and a large part of the schemes have some disadvantages: or the material consumption is big, for example the magnet steel consumption, or there is the structure complicacy, for example contain specific accent magnetic ring or birotor structure, has increased material cost and technology cost greatly compared ordinary motor. Although the single-layer air gap gear compound motor has a simple structure, the single-layer air gap gear compound motor mostly has the limitation of low torque density.
Disclosure of Invention
The invention aims to provide a single-layer air gap magnetic gear composite motor, which not only solves the defects of large using amount of multilayer air gap magnetic steel and complex structure of the magnetic gear composite motor, but also solves the problem of low torque density of the single-layer air gap magnetic gear composite motor through the magnetic concentration design of rotor magnetic steel.
In order to achieve the purpose, the invention adopts the technical scheme that: a magnetic gear composite motor with a single-layer air gap comprises a shell, an outer rotor, permanent magnets and a stator, wherein the outer rotor is arranged on the outer side of the stator, a layer of air gap is formed between the outer rotor and the stator, the outer rotor comprises a rotor core and the permanent magnets which are uniformly distributed along the circumferential direction of the rotor and alternately magnetized in a tangential direction, a plurality of spaced slots are uniformly distributed along the circumferential direction of the outer edge of the stator, stator teeth are arranged between the adjacent slots, and three-phase armature windings are symmetrically nested on the stator teeth so that the stator teeth can be used as magnetic pole adjusting blocks to modulate a magnetic field.
And the rotor iron core of the outer rotor is formed by compounding and superposing a plurality of silicon steel sheets.
The number of the slots on the stator is larger than the number of pairs of permanent magnet poles on the outer rotor.
The number of pole pairs of an armature magnetic field on the stator is Nst-Nrt, the number of pole pairs of the outer rotor is Nrt and is Nrt > (Nst-Nrt), the number of pole pairs of a three-phase armature winding on the stator is Ps, the number of pole pairs of effective harmonics after modulation is Pe, and the Ps is Pe (Nst-Nrt).
And when the outer rotor rotation angular velocity is Wr, the air gap effective harmonic rotation angular velocity is We and the stator armature magnetic field angle velocity is Ws, the We/Wr is Ws/Wr is Nrt/Pe is Nrt/Ps.
The invention has the beneficial effects that: the outer rotor can increase the effective air gap diameter and improve the single-layer air gap power density, the outer rotor permanent magnets are embedded and arranged in a spoke shape, the magnetic concentration effect can be generated, the air gap flux density is improved, the motor power density is improved, the permanent magnets can bear the compressive stress when the outer rotor rotates, the falling and the damage are avoided, and the overall mechanical strength of the outer rotor can be improved; the alternate arrangement of the tooth grooves of the stator can cause the air gap magnetic conductance to periodically change in the circumferential direction, the magnetomotive force generated by the outer rotor permanent magnet acts with the alternating magnetic conductance, a series of space harmonic magnetic fields can be generated in the air gap, and the number of pole pairs of the space harmonic magnetic fields is closely related to the number of pole pairs of the outer rotor permanent magnet and the number of the stator tooth grooves, so that different speed reduction effects can be obtained by adjusting the number of the stator tooth grooves and the number of the pole pairs of the outer rotor permanent magnet, and the structure of the flywheel system can be simplified.
Compared with the existing double-air-gap or three-air-gap magnetic gear composite motor, the magnetic gear composite motor provided by the invention has a simple structure, not only reduces the process difficulty, but also greatly saves the production and manufacturing cost; compared with the existing single-layer air gap magnetic gear composite motor, the single-layer air gap magnetic gear composite motor adopts an outer rotor magnetism gathering topological structure, so that the problem of low torque density of the single-layer air gap magnetic gear composite motor is solved to a great extent.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the magnetic field distribution of the stator of the present invention using open slots;
FIG. 3 is a schematic view of a magnetic field distribution of a split slot type magnetic gear composite motor in the prior art;
the labels in the figure are: 1. stator tooth, 2, stator, 3, shell, 4, air gap, 5, permanent magnet, 6, magnetization direction, 7, outer rotor, 8, three-phase armature winding.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the invention is not limited thereto.
Referring to the attached drawings, the magnetic gear composite motor with the single-layer air gap comprises a shell 3, an outer rotor 7, a permanent magnet 5 and a stator 2, wherein the outer rotor 7 is arranged on the outer side of the stator 2, a layer of air gap 4 is formed between the outer rotor 7 and the stator 2, the outer rotor 7 comprises a rotor core and the permanent magnet 5 which is uniformly distributed along the circumferential direction of the rotor and alternately magnetized in a tangential direction, and the rotor core is formed by compounding and superposing a plurality of silicon steel sheets; on the other hand, the arrangement mode of the permanent magnets 5 can generate a magnetic concentration effect, improve the magnetic flux density of the air gap 4 and improve the power density of the motor, wherein the magnetization direction 6 of the permanent magnets 5 is shown in figure 1. A plurality of spaced slots are uniformly distributed on the outer edge of the stator 2 along the circumferential direction, so that the air gap magnetic conductance is changed and reconstructed, stator teeth 1 are arranged between adjacent slots, the air gap magnetic conductance can be periodically changed in the circumferential direction due to the alternate arrangement of stator tooth grooves, magnetomotive force generated by the permanent magnet 5 of the outer rotor 7 acts on the alternating magnetic conductance, a series of space harmonic magnetic fields can be generated in the air gap 4, and the number of pole pairs of the space harmonic magnetic fields is closely related to the number of pole pairs of the permanent magnet of the outer rotor and the number of the stator tooth grooves. The three-phase armature winding 8 is symmetrically embedded on the stator teeth 1, so that the stator teeth 1 are used as the magnetic pole adjusting blocks to modulate the magnetic field, the magnetic pole adjusting blocks are omitted, the space utilization rate is effectively improved, and the original short-circuited magnetic excitation wire of the magnetic pole adjusting blocks can smoothly pass through the effective ring-turn armature winding of the stator teeth 1, so that the utilization rate of the permanent magnet 5 is improved.
Fig. 2 is a schematic view of magnetic field distribution of a stator adopting an open slot, and fig. 3 is a schematic view of magnetic field distribution of a split slot type magnetic gear composite motor in the prior art, which can find that the split slot type stator tooth part in fig. 3 has large magnetic leakage and reduces the utilization rate of ferromagnetic materials.
Because the outer rotor magnetic gear compound motor is mainly used for direct-drive large-torque occasions, the outer rotor 7 belongs to a low-speed part, the number of stator slots of the magnetic gear compound motor is slightly larger than the number of pole pairs of permanent magnets of the rotor, and the Nst-Nrt pole-pair harmonic magnetic field in the air gap 4 is ensured to have smaller pole pair number and higher rotating speed. At the moment, the three-phase armature winding 8 in the magnetic gear composite motor and the armature winding of the common permanent magnet synchronous motor are not designed to have the number of pole pairs of Nrt, but designed to be Nst-Nrt.
The number of pole pairs of the armature magnetic field of the stator of the magnetic gear composite motor is Nst-Nrt, the numerical value is small, high-speed design is guaranteed, and the number of pole pairs Nrt of the outer rotor is larger than that of the Nst-Nrt, so that low-rotating-speed design of the outer rotor is guaranteed. The pole pair number Ps of the stator winding is equal to the pole pair number Pe of the modulated effective harmonic wave, and one of the pole pair numbers Ps is Pe and Nst-Nrt.
The outer rotor rotation angular velocity Wr, the air gap effective harmonic rotation angular velocity We and the stator armature magnetic field angular velocity Ws satisfy the following relations: We/Wr-Ws/Wr-Nrt/Pe-Nrt/Ps.
For example, in the magnetic gear compound motor in fig. one, the number of stator slots Nst is 18, the number of rotor pole pairs Nrt is 28/2 is 14, Ps is 18-14 is 4, the speed ratio between the stator magnetic field and the outer rotor angular speed is G14/4, which is equivalent to the effect that an ordinary permanent magnet synchronous motor is connected with a reducer with a reduction ratio of 14/4, thereby greatly simplifying the complexity of the system structure and saving a large amount of cost.
The above embodiments are only intended to illustrate the technical solution of the present invention and not to limit the same, and it should be understood by those of ordinary skill in the art that the specific embodiments of the present invention can be modified or substituted with equivalents with reference to the above embodiments, and any modifications or equivalents without departing from the spirit and scope of the present invention are within the scope of the claims to be appended.
Claims (5)
1. The utility model provides a magnetism gear compound motor of individual layer air gap, includes shell, external rotor, permanent magnet and stator, its characterized in that: the outer rotor is arranged on the outer side of the stator, a layer of air gap is formed between the outer rotor and the stator, the outer rotor comprises a rotor iron core and permanent magnets which are uniformly distributed along the circumferential direction of the rotor and alternately magnetized tangentially, a plurality of spaced slots are uniformly distributed along the circumferential direction of the outer edge of the stator, the magnetic conductance of the air gap is changed and reconstructed, stator teeth are arranged between the adjacent slots, and three-phase armature windings are symmetrically nested on the stator teeth so that the stator teeth can be used as magnetic pole adjusting blocks for modulating a magnetic field.
2. A single layer air gap magnetic gear composite electric machine as claimed in claim 1, wherein: and the rotor iron core of the outer rotor is formed by compounding and superposing a plurality of silicon steel sheets.
3. A single layer air gap magnetic gear composite electric machine as claimed in claim 1, wherein: the number of the slots on the stator is larger than the number of pairs of permanent magnet poles on the outer rotor.
4. A single layer air gap magnetic gear composite electric machine as claimed in claim 1, wherein: the number of pole pairs of an armature magnetic field on the stator is Nst-Nrt, the number of pole pairs of the outer rotor is Nrt and is Nrt > (Nst-Nrt), the number of pole pairs of a three-phase armature winding on the stator is Ps, the number of pole pairs of effective harmonics after modulation is Pe, and the Ps is Pe (Nst-Nrt).
5. A single layer air gap magnetic gear composite electric machine as claimed in claim 1, wherein: and when the outer rotor rotation angular velocity is Wr, the air gap effective harmonic rotation angular velocity is We and the stator armature magnetic field angle velocity is Ws, the We/Wr is Ws/Wr is Nrt/Pe is Nrt/Ps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110764674.9A CN113489184A (en) | 2021-07-06 | 2021-07-06 | Magnetic gear composite motor with single-layer air gap |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110764674.9A CN113489184A (en) | 2021-07-06 | 2021-07-06 | Magnetic gear composite motor with single-layer air gap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113489184A true CN113489184A (en) | 2021-10-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110764674.9A Withdrawn CN113489184A (en) | 2021-07-06 | 2021-07-06 | Magnetic gear composite motor with single-layer air gap |
Country Status (1)
| Country | Link |
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| CN (1) | CN113489184A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696558A (en) * | 2022-04-25 | 2022-07-01 | 哈尔滨理工大学 | Multi-gear main and auxiliary tooth type alternating pole permanent magnet vernier motor |
| WO2024021239A1 (en) * | 2022-07-27 | 2024-02-01 | 宁波恒帅股份有限公司 | Electric excitation motor driven by means of harmonic magnetic field |
-
2021
- 2021-07-06 CN CN202110764674.9A patent/CN113489184A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114696558A (en) * | 2022-04-25 | 2022-07-01 | 哈尔滨理工大学 | Multi-gear main and auxiliary tooth type alternating pole permanent magnet vernier motor |
| CN114696558B (en) * | 2022-04-25 | 2024-04-26 | 哈尔滨理工大学 | Multi-gear main and auxiliary tooth type alternating pole permanent magnet vernier motor |
| WO2024021239A1 (en) * | 2022-07-27 | 2024-02-01 | 宁波恒帅股份有限公司 | Electric excitation motor driven by means of harmonic magnetic field |
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Application publication date: 20211008 |
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