CN108429371A - A kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force - Google Patents
A kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force Download PDFInfo
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- CN108429371A CN108429371A CN201810225539.5A CN201810225539A CN108429371A CN 108429371 A CN108429371 A CN 108429371A CN 201810225539 A CN201810225539 A CN 201810225539A CN 108429371 A CN108429371 A CN 108429371A
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- Prior art keywords
- permanent magnet
- normal direction
- motor
- electromagnetic force
- pole
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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
- H02K1/2706—Inner rotors
- H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
- H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
- H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
- H02K1/278—Surface mounted magnets; Inset magnets
-
- 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)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The present invention relates to a kind of motor permanent magnet magnetic pole distributed architectures improving normal direction electromagnetic force, including the shaft set gradually from inside to outside, rotor core, permanent magnet pole and stator core, air gap is equipped between the permanent magnet pole and stator core, it is characterized in that, the permanent magnet pole is equipped with multiple, and it is uniformly distributed circumferentially, the inner surface of adjacent permanent magnet pole contacts only at endpoint, outer surface does not contact, compared with prior art, the present invention has air gap magnetic density waveform close to sine, reduce normal direction electromagnetic force amplitude, the advantages that final vibration for reducing motor and noise.
Description
Technical field
The present invention relates to technical field of motors, and electricity is synchronized more particularly, to a kind of durface mounted permanent magnet improving normal direction electromagnetic force
Machine permanent magnet pole distributed architecture.
Background technology
In recent decades, coming out one after another with Al-Ni-Co permanent magnet, ferrite permanent magnet, particularly rare-earth permanent magnet,
Magnetic property has large increase, many electro-magnetic motors to use permanent magnet excitation instead one after another again.Compared with electro-magnetic motor, Permanent Magnet and Electric
Machine has simple in structure, reliable for operation, small, light weight, and loss is small, efficient, and the shape and size of motor can be flexible
Various equal remarkable advantages, it can not only replace the electro-magnetic motor of parts of traditional, but also electro-magnetic motor may be implemented and be difficult to
The high-performance reached.It is driven currently, permanent magnet synchronous motor is widely used in various servo motors, wind power generation field, electric vehicle
Dynamic field and electric main shaft of digital control machine tool motor.
According to the difference of permanent magnet position on rotor, the rotor magnetic circuit structural of permanent magnet synchronous motor generally can be divided into three
Kind：Surface-mount type, built-in and Lundell.Common durface mounted permanent magnet synchronous motor permanent magnetic shape is broadly divided into two types,
One kind is cylinder type, is directly sleeved on rotor outer surface, and manufacturing process is simple, easy for installation, but its permanent magnet dosage is too big,
Cost is excessively high, Gu gradually it is eliminated；Another kind is tile shape permanent magnet common at present, and polylith tile shape permanent magnet is discontinuous
It is attached on rotor outer surface, compared with cylindrical shape, this type permanent magnet dosage is greatly lowered.However discontinuous permanent magnet magnetic
Magnetic field amount jumping characteristic is big in the distributed architecture of pole, causes big, the sinusoidal sex distortion rate of air gap flux density harmonic content high, so that electric
Machine normal direction electromagnetic force harmonic content is high, amplitude is big, and finally causes big vibration noise problem, has to motor performance more serious
Influence.
Magnetic flux Φ, which can be obtained, according to magnetic circuit ohm law is equal to magnetic potential F divided by magnetic resistance Rm, under the same pole of motor, magnetic circuit
Essentially identical, magnetic resistance is also essentially identical, so the place of magnetic potential greatly just will produce larger magnetic flux, will also be generated in air gap
Larger flux density.As long as controlling the waveform of air gap flux density according to this principle magnetic potential that rationally control permanent magnet generates,
And then achieve the effect that improve motor normal direction electromagnetic force.So air gap magnetic can be controlled by rationally designing permanent magnet appearance and size
Close waveform improves normal direction electromagnetic force.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of improvement normal direction electromagnetism
The motor permanent magnet magnetic pole distributed architecture of power.
The purpose of the present invention can be achieved through the following technical solutions：
Turn that be a kind of to improve the motor permanent magnet magnetic pole distributed architecture of normal direction electromagnetic force, including setting gradually from inside to outside
Axis, rotor core, permanent magnet pole and stator core are equipped with air gap between the permanent magnet pole and stator core, special
Sign is, the permanent magnet pole is equipped with multiple, and is uniformly distributed circumferentially, the inner surface of adjacent permanent magnet pole only exists
It is contacted at endpoint, outer surface does not contact.
The inner surface and the outer surface of the permanent magnet pole is arc-shaped, and inner surface arc length L2More than outer surface arc
Long L1。
The permanent magnet pole inner surface arc length L2Meet：
L2=2 π R/P
Wherein, R is rotor diameter, and P is permanent magnet number of poles.
The oblique side of the permanent magnet pole is of a straight line type.
Angle α≤45 ° of the oblique side and inner surface of the permanent magnet pole between the tangent line at endpoint.
The inner surface and the outer surface of arc-shaped and rotor core are concentric.
The radial maximum gauge of the permanent magnet pole is that thickness is calculated on motor road.
The motor is durface mounted permanent magnet synchronous motor.
Compared with prior art, the present invention has the following advantages：
A kind of durface mounted permanent magnet synchronous motor permanent magnetic body magnetic pole distributed architecture proposed by the present invention, compared to permanent magnet pole
It is distributed discontinuous structure, hence it is evident that improve air-gap field and normal direction electromagnetic force so that air gap magnetic density waveform is dropped closer to sine
Low normal direction electromagnetic force amplitude, because permanent magnet of the present invention distribution is continuous, Gu according to Φ=F/Rm(Φ-magnetic flux；F- magnetic potentials；RmMagnetic
Resistance), in surface-mount type air-gap field, two kinds of distribution modes of permanent magnet, magnetic resistance RmApproximately equal, then magnetic flux Φ is by magnetic potential F shadows
It rings, magnetic potential F is mainly determined by permanent magnetism shape, therefore continuously distributed permanent magnet makes air-gap field sine aberration rate small；According to(fnNormal direction electromagnetic force wave；brRadial magnetic flux density；btTangential magnetic flux density；
μ0Space permeability) it is found that normal direction electromagnetic force will also improve, amplitude reduces, harmonic wave is reduced.Because normal direction electromagnetic force is to cause
The main reason for motor electromagnetic vibration noise, then the final vibration for reducing motor of the present invention and noise, improve the globality of motor
Energy.
Description of the drawings
Fig. 1 is that the permanent magnet of the present invention is distributed continuous durface mounted permanent magnet synchronous motor structure schematic diagram；
Wherein, 1, stator core, 2, air gap, 3, rotor core, 4, permanent magnet pole, 5, shaft, 6, permanent magnet pole it is oblique
Side, 7, outside permanent magnet pole, 8, permanent magnet pole inner edge.
Fig. 2 is that the permanent magnet of the present invention is distributed continuous durface mounted permanent magnet synchronous motor half partial structurtes signal
Figure.
Fig. 3 is the permanent magnet pole structural schematic diagram of the present invention.
Fig. 4 is that permanent magnet of the present invention is distributed continuous durface mounted permanent magnet synchronous motor (α=28 °) and plain edition permanent magnet
It is distributed the definition graph that the normal direction electromagnetic force of discontinuous durface mounted permanent magnet synchronous motor is compared.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
The present invention is distributed problem caused by discontinuous durface mounted permanent magnet synchronous motor for current permanent magnet, proposes one
The new permanent magnet pole distributed architecture of kind, including stator core, air gap, rotor core, permanent magnet pole, shaft.
Adjacent two permanent magnet pole of durface mounted permanent magnet synchronous motor intersects at permanent magnet pole inner edge endpoint, and adjacent two forever
Magnet poles are only put at this and are overlapped；Arc length L1 is that length is calculated on motor road outside durface mounted permanent magnet synchronous motor permanent magnetic body magnetic pole, interior
Side arc length L2=2 π R/P, and meet relational expression L1 ＜ L2.
Durface mounted permanent magnet synchronous motor permanent magnetic body magnetic pole bevel edge and tangent line angulation α≤45 ° at inner edge endpoint.
The center of circle outside durface mounted permanent magnet synchronous motor permanent magnetic body magnetic pole and corresponding to inner edge and the axle center with rotor core
It overlaps；Outside durface mounted permanent magnet synchronous motor permanent magnetic body magnetic pole and inner edge is arc-shaped side, and permanent magnet pole bevel edge is linear type
Bevel edge.
Durface mounted permanent magnet synchronous motor permanent magnetic body radial direction maximum gauge is that thickness is calculated on motor road.
Concrete structure：
With reference to figure 1, Fig. 2, Fig. 3, which is that durface mounted permanent magnet synchronous motor permanent magnetic body magnetic pole distributed architecture of the present invention is specific
Embodiment.
Permanent magnet synchronous motor in the example is 48 slot, 4 pole, and there is stator core 1, rotor core 3, shaft 5 to run through rotor
Iron core 3, rotor core 3 drive shaft 5 to be rotated relative to stator core 1；Permanent magnet pole 4 is pasted on the appearance of rotor core 3
Face, and it is continuously distributed；Permanent magnet pole 4 is uniformly distributed along 3 outer surface of rotor core.
Specific size：
By taking certain model permanent magnet synchronous motor as an example, stator is Double Layer Winding；Stator core internal diameter is 42.5mm；Stator iron
Core outer diameter is 65mm；Width of air gap is 0.4mm, and permanent magnet radial direction maximum gauge is 4mm；Iron core axial length is 145mm；α can
15 °, 28 ° and 42 ° are chosen, permanent magnet pole outside arc length L1=52.8mm；Permanent magnet inner edge arc length L2=59.69mm.
Permanent magnet is distributed continuous durface mounted permanent magnet synchronous motor structure and design parameter size according to the present invention, in two dimension
Modeling and simulating in finite element electromagnetic simulation software obtains permanent magnet and is distributed continuous durface mounted permanent magnet synchronous motor and permanent magnet point
The discontinuous durface mounted permanent magnet synchronous motor simulation result of cloth, such as Fig. 4.
From fig. 4, it can be seen that permanent magnet of the present invention, which is distributed continuous durface mounted permanent magnet synchronous motor structure, is obviously improved normal direction electricity
Magnetic force makes the reduction of its amplitude.
Claims (8)
- Improving the motor permanent magnet magnetic pole distributed architecture of normal direction electromagnetic force 1. a kind of, including the shaft set gradually from inside to outside (5), rotor core (3), permanent magnet pole (4) and stator core (1), the permanent magnet pole (4) and stator core (1) it Between be equipped with air gap (2), which is characterized in that the permanent magnet pole (4) is equipped with multiple, and is uniformly distributed circumferentially, adjacent The inner surface of permanent magnet pole (4) contacts only at endpoint, and outer surface does not contact.
- 2. a kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force according to claim 1, feature exist In the inner surface and the outer surface of, the permanent magnet pole (4) be arc-shaped, and inner surface arc length L2More than outer surface arc length L1。
- 3. a kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force according to claim 2, feature exist In the permanent magnet pole (4) inner surface arc length L2Meet：L2=2 π R/PWherein, R is rotor diameter, and P is permanent magnet number of poles.
- 4. a kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force according to claim 1, feature exist In the oblique side of the permanent magnet pole (4) is of a straight line type.
- 5. a kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force according to claim 4, feature exist In angle α≤45 ° of the oblique side and inner surface of, the permanent magnet pole (4) between the tangent line at endpoint.
- 6. a kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force according to claim 2, feature exist In the inner surface and the outer surface and rotor core (3) of arc-shaped are concentric.
- 7. a kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force according to claim 1, feature exist In the radial maximum gauge of the permanent magnet pole (4) is that thickness is calculated on motor road.
- 8. a kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force according to claim 1, feature exist In the motor is durface mounted permanent magnet synchronous motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810225539.5A CN108429371A (en) | 2018-03-19 | 2018-03-19 | A kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810225539.5A CN108429371A (en) | 2018-03-19 | 2018-03-19 | A kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force |
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| Publication Number | Publication Date |
|---|---|
| CN108429371A true CN108429371A (en) | 2018-08-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810225539.5A Pending CN108429371A (en) | 2018-03-19 | 2018-03-19 | A kind of motor permanent magnet magnetic pole distributed architecture improving normal direction electromagnetic force |
Country Status (1)
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|---|---|
| CN (1) | CN108429371A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02111238A (en) * | 1988-10-17 | 1990-04-24 | Fanuc Ltd | Permanent magnet type synchronous motor |
| JP2000102200A (en) * | 1998-09-28 | 2000-04-07 | Matsushita Electric Ind Co Ltd | Electromagnetic rotary machine and application equipment thereof |
| CN201781395U (en) * | 2010-05-11 | 2011-03-30 | 湖南科力电机股份有限公司 | Direct current brushless motor stator and rotor device with low cogging torque |
-
2018
- 2018-03-19 CN CN201810225539.5A patent/CN108429371A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02111238A (en) * | 1988-10-17 | 1990-04-24 | Fanuc Ltd | Permanent magnet type synchronous motor |
| JP2000102200A (en) * | 1998-09-28 | 2000-04-07 | Matsushita Electric Ind Co Ltd | Electromagnetic rotary machine and application equipment thereof |
| CN201781395U (en) * | 2010-05-11 | 2011-03-30 | 湖南科力电机股份有限公司 | Direct current brushless motor stator and rotor device with low cogging torque |
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Application publication date: 20180821 |