CN107482808A - A kind of new method for reducing built-in permanent magnetic rotor eddy-current loss - Google Patents
A kind of new method for reducing built-in permanent magnetic rotor eddy-current loss Download PDFInfo
- Publication number
- CN107482808A CN107482808A CN201610405364.7A CN201610405364A CN107482808A CN 107482808 A CN107482808 A CN 107482808A CN 201610405364 A CN201610405364 A CN 201610405364A CN 107482808 A CN107482808 A CN 107482808A
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- CN
- China
- Prior art keywords
- permanent magnet
- current loss
- eddy
- rotor
- new method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
- H02K1/276—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention discloses a kind of new method for reducing permanent magnet machine rotor eddy-current loss, built-in permanent magnetic motor can be applied to.In high-speed permanent magnet motor, time harmonic and space harmonics collective effect, the higher hamonic wave magnetic field relative to rotor asynchronous rotation is produced, and then eddy-current loss is produced in permanent magnet.Because high conductivity material has the shielding action to high frequency magnetic field, therefore the eddy-current loss in the mode of embedded permanent magnet surfaces one layer of sheet copper of addition reduces permanent magnet is proposed, and then optimize rotor overall losses.Copper coin size is identical with permanent magnet to cover permanent magnet surfaces comprehensively；Copper plate thickness is determined by main subfrequency, is selected according to actual conditions, typically smaller than 1mm.Due to the shielding action of copper coin, permanent magnet eddy-current loss greatly reduces and rotor total losses significantly reduce.
Description
Technical field
The present invention relates to motor device component, more particularly to high-speed permanent magnet motor permanent magnet.
Background technology
Modern flywheel energy storage system combines advanced composite material rotor, magnetic suspension bearing, high-speed electric expreess locomotive and power
Electronic technology, so as to greatly improve performance, widely apply to power grid frequency modulation, island-grid peak regulation, vehicle regenerative braking,
The fields such as power quality controlling, power network safety operation.
High-speed permanent magnet motor has that control performance is good, energy conversion efficiency is high, be easy to high-speed cruising, adapts to speed on a large scale
Degree change, simple in construction, power density is high, without excitation loss, efficiency high, control strategy maturation the advantages that, suitable for high speed fly
Take turns in energy-storage system.Flywheel energy storage with magneto due to being run under the operating mode of high-speed high frequency, rotor at a high speed rotate when,
Because rotor radiating condition is limited, in permanent magnet the accumulation of eddy-current loss temperature of rotor can be caused to raise.For curie point it is relatively low,
The larger NdFeB material of temperature coefficient, too high temperature can cause permanent magnet performance to decline, influence the reliability of motor with it is steady
It is qualitative.Therefore to how to reduce the research of high speed permanent magnet motor rotor eddy-current loss for further lifting flywheel energy storage high speed
The reliability of magneto is significant.
The content of the invention
The defects of to overcome prior art, the scheme for shielding layers of copper is added the invention provides a kind of permanent magnet surfaces,
On the basis of not influenceing motor performance, the eddy-current loss in high speed permanent magnet motor rotor permanent magnet can be reduced, optimization rotor is whole
Body is lost.
To achieve these goals, the technical solution adopted by the present invention is：Screen layer is added in embedded permanent magnet surfaces.
In motor rotor punching sheet manufacturing process, shielding copper plate thickness should be reserved at permanent magnet slot, its thickness depends primarily on entrance
The main subharmonic in rotor field depth of penetration in screen layer.Copper plate thickness is excessive will not to be increased to limitation of high harmonics effect,
Can slot excessive influence mechanical strength because of punching on the contrary；The too small shield effectiveness unobvious of thickness, and copper coin difficulty of processing can be increased.
Copper coin size should with permanent magnet surfaces sizableness before axial segmentation, so that permanent magnet is completely covered.
The beneficial effects of the invention are as follows:1) permanent magnet surfaces, which add copper coin screen layer, can significantly reduce the vortex of permanent magnet
Loss, the permanent magnet heating demagnetization phenomenon as caused by eddy-current loss is avoided, improve the performance indications of motor.2) permanent magnet surfaces add
Motor overall structure need not be changed by entering copper coin screen layer, and manufacturing process is simple and easy.
Brief description of the drawings
Fig. 1 is permanent magnet machine rotor axial direction schematic diagram after present invention addition screen layer
Fig. 2 is permanent-magnetic electric machine rotor magnet steel of the present invention and screen layer schematic diagram
In Fig. 1：
1 --- copper coin screen layer 2 --- permanent magnet
In Fig. 2：
1 --- copper coin screen layer 2 --- permanent magnet 3 --- rotor core
Embodiment
Fig. 1 show the schematic diagram that the present invention is lost by the additional copper coin screen layer of permanent magnet surfaces with smaller permanent magnet.
Due to shielding action of the caused vortex to high frequency magnetic field in high conductivity material copper, eddy-current loss will greatly subtract in permanent magnet
It is small.It can be obtained by maxwell equation group, in the case where not considering displacement current, the vortex of two-dimentional vortex field in screen layer
Density equation is as follows：
In formula,Represent the density of the vortex ource electric current on axial direction；Represent magnetic potential；σ represents the electrical conductivity of material；μ tables
Show the magnetic conductivity of material.
Instantaneous eddy-current loss is as follows in screen layer：
In formula, S represents the area of vortex section；L represents the length of motor shaft.
Penetration depth of the harmonic wave of magnetic flux density in permanent magnet is by the frequency of harmonic wave, the magnetic conductivity of screen layer in screen layer
Together decided on the electrical conductivity of screen layer, shielding thickness involved in the present invention is determined by the harmonic wave maximum depth of penetration.By material
Expect that characteristic is understood, the electrical conductivity of copper is 5.77 × 107S/m, the magnetic conductivity of copper is 4 π × 10-7H/m, penetration depth such as following formula institute
Show：
Wherein, σ is material electric conductivity, μ permeabilities, ω harmonic wave angular frequencies.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention, it is all
It is any simple modification, equivalent change and modification made according to the technical spirit of the present invention to above example, still falls within
In the range of technical solution of the present invention.
Claims (2)
- A kind of 1. new method for reducing built-in permanent magnetic rotor eddy-current loss, it is characterised in that：By in built-in permanent magnetic Body surface face adds the screen layer of copper product to reduce permanent magnet eddy-current loss.
- 2. a kind of new method for reducing built-in permanent magnetic rotor eddy-current loss according to claim 1, its feature exist In：It is applied in magneto, and shielding thickness, which is equal in motor, produces the harmonic wave of main eddy-current loss in screen layer The depth of penetration, its size are suitable equal to permanent magnet, and permanent magnet surfaces are fixed in a manner of stickup etc..
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610405364.7A CN107482808A (en) | 2016-06-07 | 2016-06-07 | A kind of new method for reducing built-in permanent magnetic rotor eddy-current loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610405364.7A CN107482808A (en) | 2016-06-07 | 2016-06-07 | A kind of new method for reducing built-in permanent magnetic rotor eddy-current loss |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107482808A true CN107482808A (en) | 2017-12-15 |
Family
ID=60594326
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610405364.7A Pending CN107482808A (en) | 2016-06-07 | 2016-06-07 | A kind of new method for reducing built-in permanent magnetic rotor eddy-current loss |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107482808A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380536A (en) * | 2019-07-18 | 2019-10-25 | 浙江大学 | A kind of rotor structure for permanent magnet motor enhancing harmonic field shielding action |
| WO2023233620A1 (en) * | 2022-06-02 | 2023-12-07 | 三菱電機株式会社 | Permanent magnet-type rotary electric machine control system and permanent magnet-type rotary electric machine control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0808526A1 (en) * | 1995-02-09 | 1997-11-26 | British Nuclear Fuels PLC | An energy storage and conversion apparatus |
| JP2000060042A (en) * | 1998-08-12 | 2000-02-25 | Hitachi Ltd | Permanent magnet rotor |
| CN204741353U (en) * | 2015-07-23 | 2015-11-04 | 湘潭电机股份有限公司 | High -speed permanent -magnet machine rotor |
-
2016
- 2016-06-07 CN CN201610405364.7A patent/CN107482808A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0808526A1 (en) * | 1995-02-09 | 1997-11-26 | British Nuclear Fuels PLC | An energy storage and conversion apparatus |
| JP2000060042A (en) * | 1998-08-12 | 2000-02-25 | Hitachi Ltd | Permanent magnet rotor |
| CN204741353U (en) * | 2015-07-23 | 2015-11-04 | 湘潭电机股份有限公司 | High -speed permanent -magnet machine rotor |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110380536A (en) * | 2019-07-18 | 2019-10-25 | 浙江大学 | A kind of rotor structure for permanent magnet motor enhancing harmonic field shielding action |
| CN110380536B (en) * | 2019-07-18 | 2024-04-16 | 浙江大学 | Permanent magnet motor rotor structure for enhancing harmonic magnetic field shielding effect |
| WO2023233620A1 (en) * | 2022-06-02 | 2023-12-07 | 三菱電機株式会社 | Permanent magnet-type rotary electric machine control system and permanent magnet-type rotary electric machine control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20171215 |