CN104811003B - A kind of electric machine structure for reducing interior permanent magnet machines magnet steel eddy-current loss - Google Patents
A kind of electric machine structure for reducing interior permanent magnet machines magnet steel eddy-current loss Download PDFInfo
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- CN104811003B CN104811003B CN201510228283.XA CN201510228283A CN104811003B CN 104811003 B CN104811003 B CN 104811003B CN 201510228283 A CN201510228283 A CN 201510228283A CN 104811003 B CN104811003 B CN 104811003B
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- permanent magnet
- electric machine
- machine structure
- magnetoresistive strip
- current loss
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Abstract
The invention provides a kind of electric machine structure for reducing interior permanent magnet machines magnet steel eddy-current loss, including rotor and stator.Wherein, the rotor includes the multiple permanent magnets separated in circumference, is disposed with the circumferential side wall of each permanent magnet every magnetic bridge, wherein every the magnetoresistive strip that circumferentially extending is formed with the circumferential side wall of magnetic bridge.The stator includes winding and the in the circumferential teeth portion between winding, wherein the teeth portion is eccentric tooth.
Description
Technical field
The present invention relates to magneto field, it is more particularly related to a kind of reduce interior permanent magnet machines magnetic
The electric machine structure of steel eddy-current loss.
Background technology
In recent years, internal permanent magnet synchronous motor, it is wide the advantages of there is high efficiency, high power density due to it
It is general to apply to new-energy automobile industry.But, for built-in motor, permanent magnet is generally full-closed structure, rotor heat sink strip
Part is bad；In high-speed cruising, because slot ripples and magnetic structure is asymmetric etc. produced by reason permanent magnet eddy-current loss will
Cause permanent magnet to heat up, influence the operating accuracy of sensor and the structural strength of rotor so that the efficiency reduction of motor, when serious
The irreversible loss of excitation of permanent magnet can be even caused, this is fatal for magneto.Wherein centralization winding is built-in
Formula permagnetic synchronous motor, because it has larger stator slot away from therefore magnet steel eddy-current loss problem is the most serious.So have must
Explore the method for reducing magnet steel eddy-current loss.In this regard, domestic and foreign scholars have all done many researchs.
For magneto, it is exactly magnet steel segmentation, magnet steel point to reduce rotor magnetic steel eddy-current loss most common method
Section can be divided into the axial segmentation of permanent magnet and circumferentially segmented.However, stator and rotor sructure and number of stator slots, width of rebate, gas
Gap length, screen layer, stator tooth open the change that auxiliary slot air gap, rotor surface open auxiliary tank, permanent magnet disposing way etc. factor
Change can also influence rotor magnetic steel to be vortexed damage.For example, for the interior permanent magnet machines of centralized winding, can be fixed by increase
The method of magnetic circuit reluctance reduces the method for magnet steel eddy-current loss between rotor, but magnetic circuit reluctance is while increase, motor torque
Also decrease.Motor torque is one of important performance of motor, and torque reduction can influence the performance of motor.
So, do not propose that a kind of particularly effective interior permanent magnet machines magnet steel that can reduce is vortexed also in the prior art
The scheme of loss.
The content of the invention
The technical problems to be solved by the invention are directed to and there is drawbacks described above in the prior art, there is provided one kind can be not
The electric machine structure of interior permanent magnet machines magnet steel eddy-current loss is reduced in the case of influenceing the performance of motor, is enable to carry
Lifting motor efficiency, reduces rotor temperature rise.Wherein, designed by stator bias tooth and internal rotor magnetoresistive strip designs increase magnetic
The method of road magnetic resistance reduces magnet steel eddy-current loss, reaches the purpose for reducing motor temperature rise and lifting motor efficiency.
In order to realize above-mentioned technical purpose, according to the present invention, there is provided one kind reduces interior permanent magnet machines magnet steel vortex
The electric machine structure of loss, including：Rotor and stator；Wherein described rotor includes the multiple permanent magnets separated in circumference, each
It is disposed with the circumferential side wall of permanent magnet every magnetic bridge, wherein every the magnetoresistive strip that circumferentially extending is formed with the circumferential side wall of magnetic bridge.
Preferably, the stator includes winding and the in the circumferential teeth portion between winding, wherein the teeth portion is
Eccentric tooth.
Preferably, the development length of magnetoresistive strip is between 1st to a thirtieth/10th of the length of permanent magnet.
Preferably, the development length of magnetoresistive strip between the length of permanent magnet 10 1/1st/15th to 20 it
Between.
Preferably, magnetoresistive strip is fixed on the middle position of the circumferential side wall every magnetic bridge.
Preferably, the shape of magnetoresistive strip is rectangular strip.
Preferably, the shape of magnetoresistive strip is cylindrical shape.
Preferably, permanent magnet is rectangular configuration.
Brief description of the drawings
With reference to accompanying drawing, and by reference to following detailed description, it will more easily have more complete understanding to the present invention
And its adjoint advantages and features is more easily understood, wherein：
Fig. 1 schematically shows the distribution of motor magnetic linkage.
Fig. 2 schematically shows 1/6th motor 3D models of electric machine structure according to the preferred embodiment of the invention.
Fig. 3 schematically shows the part motor 2D models of electric machine structure according to the preferred embodiment of the invention.
Fig. 4 schematically shows the part plan structure chart every magnetic bridge optimization according to the preferred embodiment of the invention.
Fig. 5 schematically shows the local structural graph of the eccentric design of stator teeth according to the preferred embodiment of the invention.
The principle that Fig. 6 schematically shows the eccentric design of stator teeth according to the preferred embodiment of the invention explains plane
Structure chart.
Fig. 7 schematically shows the even air gap plane structure chart according to prior art.
Fig. 8 schematically shows non-uniform gap plane structure chart according to the preferred embodiment of the invention.
It should be noted that accompanying drawing is used to illustrate the present invention, it is not intended to limit the present invention.Note, represent that the accompanying drawing of structure can
Can be not necessarily drawn to scale.Also, in accompanying drawing, same or similar element indicates same or similar label.
Specific embodiment
In order that present disclosure is more clear and understandable, with reference to specific embodiments and the drawings to of the invention interior
Appearance is described in detail.
The present inventor is had found according to research, can be designed by stator bias tooth and internal rotor magnetoresistive strip is designed
Magnet steel eddy-current loss is reduced to increase the method for magnetic circuit reluctance, and causes that motor torque is not substantially reduced.
Specifically, permanent magnet eddy-current loss source is:(1) the harmonic wave electricity entrained by PWM (pulse width modulation) inverter
Stream；(2) stator slot ripples；(3) rotor rotates the change of magnetic linkage on the permanent magnet for causing.For centralized winding it is built-in forever
For magneto, magnet steel eddy-current loss mostlys come from the change of magnetic linkage on the permanent magnet that rotor rotation is caused.As shown in figure 1,
Illustrated therein is the maxwell 2D model magnetic linkage distribution maps of motor 1/6th, as shown by the arrows in Figure 1, it can be seen that magnetic linkage from
Stator enters rotor through between permanent magnet every magnetic bridge.Accordingly, it is considered to can be reduced forever by increasing the magnetic resistance of this magnetic circuit
Eddy-current loss on magnet.
From above-mentioned narration, if increasing magnetic circuit reluctance can just reduce permanent magnet eddy-current loss, but magnetic resistance increase
Motor torque is also decreased simultaneously.
Fig. 2 schematically shows 1/6th motor 3D models of electric machine structure according to the preferred embodiment of the invention,
Fig. 3 schematically shows 1/6th motor 2D models of electric machine structure according to the preferred embodiment of the invention.And Fig. 4 shows
Show to meaning property according to the preferred embodiment of the invention every magnetic bridge optimization diagrammatic plan structure chart.Such as Fig. 2, Fig. 3 and Fig. 4 institute
Show, in a preferred embodiment of the invention, asking for torque reduction can be solved original every a magnetoresistive strip has been added on magnetic bridge
Topic.
That is, electric machine structure according to the preferred embodiment of the invention includes rotor 100 and stator 200, wherein the rotor 100
Including the multiple permanent magnets 10 separated in circumference, it is disposed with the circumferential side wall of each permanent magnet 10 every magnetic bridge 20, wherein every
The magnetoresistive strip 30 of circumferentially extending is formed with the circumferential side wall of magnetic bridge 20.
Preferably, as shown in Figure 2, Figure 3 and Figure 4, permanent magnet 10 is rectangular configuration.
Wherein, for the concrete structure of magnetoresistive strip 30, magnetoresistive strip 30 and be all air or true every magnetic bridge 20, inside it
Sky, does not have silicon steel sheet.
Result of finite element display motor torque for the structure of Fig. 3 is not reduced, and eddy-current loss drops significantly
It is low.And by Finite Element Simulation Analysis, magnetoresistive strip is more long, wider, and eddy-current loss is smaller, it is contemplated that the stress of rotor point
Analysis, will properly choose the length and width of magnetoresistive strip, and otherwise rotor silicon steel sheet may get rid of winged.Preferably, magnetoresistive strip 30 prolongs
Elongation is between 1st to a thirtieth/10th of the length of permanent magnet 10.It is further preferred that magnetoresistive strip 30 prolongs
Elongation is between 1st/1st/15th to 20 of the length of permanent magnet 10.
The structure of above-mentioned increase magnetoresistive strip 30 of the invention is improved and is applicable to various motor models, therefore the present invention is not
It is limited to specific magnetoresistive strip size.For the position of magnetoresistive strip, to realize maximum symmetric effect, preferably magnetoresistive strip is fixed on
Every the middle position of the circumferential side wall of magnetic bridge.And, for example, the shape of magnetoresistive strip 30 can be rectangular strip magnetoresistive strip or
The magnetoresistive strip of cylindrical shape.
On the other hand, gas length is bigger, and eddy-current loss is smaller, therefore can increase magnetic resistance by increasing air gap, but
Corresponding motor torque is also reduced a lot.Thus, the present inventor considers to design come between stator teeth using eccentric throw
The method for connecing increase gas length is optimized.
Specifically, as shown in Figure 2 and Figure 3, the stator 200 includes winding 40 and is between winding 40 in the circumferential
Teeth portion 50, wherein the teeth portion 50 is eccentric tooth.
In a particular embodiment, it is in the prior art that the eccentric design of stator teeth can be represented such as Fig. 5 Central Plains tooth and eccentric
Shown in comparing between the embodiment of the present invention represented by tooth；And as shown in fig. 6, A be the center of circle, B be the off-centre operation center of circle, AB is inclined
The heart is away from C and D is stator tooth end, and with B as the center of circle, C is starting point, and D is that terminal picture circular arc is eccentric tooth.In principle, eccentric throw
Bigger, consumption reduction effect is better, but to ensure that motor torque can not be reduced too much, to select suitable eccentric throw.For specific
Motor, can select appropriate specific size.
Such as Fig. 7, Fig. 7 is directly to increase gas length scheme (being hereafter referred to as scheme 1), therefore air gap is uniform, and Fig. 8 is
Eccentric tooth design (being hereafter referred to as scheme 2), air gap is non-uniform gap., it is apparent that maximum air gap is long in working as Fig. 8
When degree is identical with the even air gap length in Fig. 7, the average airgap length of scheme 2 is less than the even air gap length of scheme 1,
And the eddy-current loss value that finite element is calculated is less than scheme 1 (gas length is bigger, and eddy-current loss is smaller), or close to equal
(being similar to even air gap during eccentric degree very little), torque is also slightly larger than scheme 1, it is seen that scheme 2 is better.
The present invention, every a magnetoresistive strip has been added on magnetic bridge, solves the problems, such as torque reduction, to stator teeth original
Increase the method for gas length indirectly using eccentric throw design to optimize, the method for relatively directly increasing gas length, torque
What is reduced is less.Thus, Advantageous Effects of the invention at least include：(1) eddy-current loss on magnet steel is reduced；(2) ensure
Unit torque is not reduced or only slight decrease；(3) electric efficiency is improved, motor temperature rise is reduced.
The present invention is entered to internal rotor magnet steel using the principle for increasing magnetic circuit reluctance reduce loss every magnetic bridge and stator teeth
Gone improvement, be ensure that while magnet steel eddy-current loss is reduced motor torque is constant or the very little that reduces.Thus, this hair
The bright interior permanent magnet machines magnet steel eddy-current loss problem for overcoming centralized winding, proposes in stator bias tooth design and rotor
Portion's magnetoresistive strip designs to increase magnetic circuit reluctance, so as to reduce magnet steel eddy-current loss, and reaches reduction motor temperature rise lifting motor effect
The purpose of rate.
Furthermore, it is necessary to explanation, unless stated otherwise or points out, term " first " otherwise in specification, " the
Two ", description such as " 3rd " is used only for distinguishing each component, element, step in specification etc., without being intended to indicate that each
Logical relation or ordinal relation between component, element, step etc..
Although it is understood that the present invention is disclosed as above with preferred embodiment, but above-described embodiment and being not used to
Limit the present invention.For any those of ordinary skill in the art, in the case where technical solution of the present invention ambit is not departed from,
Many possible variations and modification are all made to technical solution of the present invention using the technology contents of the disclosure above, or is revised as
With the Equivalent embodiments of change.Therefore, every content without departing from technical solution of the present invention, according to technical spirit pair of the invention
Any simple modification, equivalent variation and modification made for any of the above embodiments, still fall within the scope of technical solution of the present invention protection
It is interior.
Claims (8)
1. it is a kind of reduce interior permanent magnet machines magnet steel eddy-current loss electric machine structure, it is characterised in that including：Rotor and stator；
Wherein described rotor includes the multiple permanent magnets separated in circumference, is disposed with the circumferential side wall of each permanent magnet every magnetic bridge,
Wherein every the magnetoresistive strip that circumferentially extending is formed with the circumferential side wall of magnetic bridge, the magnetoresistive strip and it is described every magnetic bridge for be arranged on turn
Air is provided with gap on son, and the gap or it is vacuum.
2. electric machine structure according to claim 1, it is characterised in that the stator includes winding and is in the circumferential
Teeth portion between winding, wherein the teeth portion is eccentric tooth.
3. electric machine structure according to claim 1 and 2, it is characterised in that the development length of magnetoresistive strip is between permanent magnet
Between 1st to a thirtieth/10th of length.
4. electric machine structure according to claim 1 and 2, it is characterised in that the development length of magnetoresistive strip is between permanent magnet
Between 1st/1st/15th to 20 of length.
5. electric machine structure according to claim 1 and 2, it is characterised in that magnetoresistive strip is fixed on the circumferential side wall every magnetic bridge
Middle position.
6. electric machine structure according to claim 1 and 2, it is characterised in that the shape of magnetoresistive strip is rectangular strip.
7. electric machine structure according to claim 1 and 2, it is characterised in that the shape of magnetoresistive strip is cylindrical shape.
8. electric machine structure according to claim 1 and 2, it is characterised in that permanent magnet is rectangular configuration.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510228283.XA CN104811003B (en) | 2015-05-06 | 2015-05-06 | A kind of electric machine structure for reducing interior permanent magnet machines magnet steel eddy-current loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510228283.XA CN104811003B (en) | 2015-05-06 | 2015-05-06 | A kind of electric machine structure for reducing interior permanent magnet machines magnet steel eddy-current loss |
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| CN104811003A CN104811003A (en) | 2015-07-29 |
| CN104811003B true CN104811003B (en) | 2017-06-09 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5097166A (en) * | 1990-09-24 | 1992-03-17 | Reuland Electric | Rotor lamination for an AC permanent magnet synchronous motor |
| CN101247055A (en) * | 2008-02-23 | 2008-08-20 | 广东美芝制冷设备有限公司 | Low-fluctuation rare earth permanent magnetic brushless motor |
| CN101330231A (en) * | 2007-06-19 | 2008-12-24 | 上海海立（集团）股份有限公司 | Permanent magnet motor stator and rotor for compressor |
| CN101536293A (en) * | 2007-02-21 | 2009-09-16 | 三菱电机株式会社 | Permanent magnet synchronous motor and enclosed compressor |
| CN103138442A (en) * | 2011-11-25 | 2013-06-05 | 丹佛斯（天津）有限公司 | Built-in permanent magnet motor rotor and built-in permanent magnet motor with same |
| CN103259351A (en) * | 2013-05-13 | 2013-08-21 | 广东威灵电机制造有限公司 | Permanent magnet motor |
-
2015
- 2015-05-06 CN CN201510228283.XA patent/CN104811003B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5097166A (en) * | 1990-09-24 | 1992-03-17 | Reuland Electric | Rotor lamination for an AC permanent magnet synchronous motor |
| CN101536293A (en) * | 2007-02-21 | 2009-09-16 | 三菱电机株式会社 | Permanent magnet synchronous motor and enclosed compressor |
| CN101330231A (en) * | 2007-06-19 | 2008-12-24 | 上海海立（集团）股份有限公司 | Permanent magnet motor stator and rotor for compressor |
| CN101247055A (en) * | 2008-02-23 | 2008-08-20 | 广东美芝制冷设备有限公司 | Low-fluctuation rare earth permanent magnetic brushless motor |
| CN103138442A (en) * | 2011-11-25 | 2013-06-05 | 丹佛斯（天津）有限公司 | Built-in permanent magnet motor rotor and built-in permanent magnet motor with same |
| CN103259351A (en) * | 2013-05-13 | 2013-08-21 | 广东威灵电机制造有限公司 | Permanent magnet motor |
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| Publication number | Publication date |
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| CN104811003A (en) | 2015-07-29 |
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Granted publication date: 20170609 Termination date: 20200506 |