CN103779989A - Rotor device for permanent magnet-excited motor - Google Patents
Rotor device for permanent magnet-excited motor Download PDFInfo
- Publication number
- CN103779989A CN103779989A CN201310637467.2A CN201310637467A CN103779989A CN 103779989 A CN103779989 A CN 103779989A CN 201310637467 A CN201310637467 A CN 201310637467A CN 103779989 A CN103779989 A CN 103779989A
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- China
- Prior art keywords
- permanent magnet
- rotor arrangement
- segment
- magnetic
- rotor
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Classifications
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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
- H02K1/2706—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]
- H02K1/2766—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect
- H02K1/2773—Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM] having a flux concentration effect consisting of tangentially magnetized radial magnets
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
Abstract
The invention relates to a rotor device for a permanent magnet-excited motor, particularly a rotor device (4) used for a rotary motor (1). The rotor device (4) comprises several pole shoes (42) that are held by a connection bar (43) at a magnetic conduction region (44) and permanent magnets (7) which are arranged between two pole shoes (42) and are extended to an outer surface of the rotor device (4) in the radial direction within the magnetic conduction region (44). The magnetization directions of the permanent magnets (7) are aligned in the arrangement direction of the pole shoes (42). One of the permanent magnets (7) has multiple portions (71, 72), and te tangential thickness of the portion (72) of the permanent magnets near to the magnetic conduction region (44) is smaller than the portion (71) far from the magnetic conduction region (44).
Description
Technical field
The present invention relates to the motor of permanent-magnet-field, particularly for the rotor arrangement of this motor.
Background technology
Know the rotor arrangement with pole shoe from prior art, this pole shoe provides the excitation field producing by permanent magnet in the direction of the air gap towards stator apparatus.For arranging in rotor arrangement in the variant of permanent magnet, permanent magnet is parallel to the direction of motion setting of rotor with its pole orientation, make the pole shoe of rotor arrangement between permanent magnet.The magnetic field of exporting from permanent magnet in pole shoe is at the direction upper deflecting of air gap.
Such rotor arrangement uses now in the motor of many permanent-magnet-fields, for example, in the situation that turning to support and in cooling device.Here substantially use square permanent magnet, it can be simply with low cost manufacture, wherein a kind of anisotropy of magnetic susceptibility and a kind of upwards directed the setting party of pole shoe in other words in the direction of rotor motion to the direction of magnetization of this identical sensing.
In electric rotating machine, this set of permanent magnet is called spoke setting.The pole orientation of permanent magnet is extended in tangential direction.
The advantage of this rotor arrangement is, can realize such air gap flux density by choosing aptly size, and it is greater than the remanent magnetic flux density of settled permanent magnet.Because air gap flux density stipulates the torque density of motor to a great extent, so can construct thus the high motor of efficiency with relatively high torque density.
This realizes by following manner, selects the number of the permanent magnet in rotor, makes its radical length be greater than the tangential width of the pole shoe between permanent magnet.This arrangement makes flux concentration in air gap, to produce the air gap flux density higher than the remanent magnetic flux density of permanent magnet.
Rotor arrangement above is often constructed with the permanent magnet combination by magnet material forms simply, cheaply, particularly there is no rare earth bond and the magnet material with relative little remanent magnetic flux density, the permanent magnet for example being formed by the ferrite material (gesinderten Ferritmateriialien der sechsten Generation) of the sintering in the 6th generation.
In addition it is strong that the permanent magnet being formed by the ferrite material of sintering has relatively little coercive field, makes to produce the danger of degaussing in the case of the reversing magnetic field of enough high field intensities.For compensating this relatively little coercive force, permanent magnet they material anisotropy and their magnetized direction on relative heavy back realize, to they can be resisted by the degaussing of the stator field of motor.
In this external above-mentioned rotor arrangement, in the magnetic flux path of permanent magnet, provide two air gaps.For still realizing high air gap flux density and the large defensive ability/resistance ability for degaussing, therefore the permanent magnet so arranging is often configured to form with ferrite material, its pole orientation is parallel to the twice thick like that (in polarised direction) of the permanent magnet of air-gap field, and the latter is because structural condition limit only has an air gap in their magnetic flux paths separately.
Especially the root diameter of regulation and the electric rotating machine of predetermined number of poles, at spoke, middle permanent magnet is set and reduces tangential increasing each time because limited structure space all can cause the radical length of its maximum possible of (polarised direction) thickness in the case of having, because the distance between permanent magnet reduces in the direction towards pivot center.This limitations restrict of the radical length of permanent magnet magnetic flux and the air gap flux density that reduces thus motor and the torque density that can provide by permanent magnet.
In addition the angle that all causes single pole shoe to cover at the air gap place of motor that increases each time of the thickness of permanent magnet reduces and can cause equally this angle to be less than its optimal value.
Summary of the invention
Task of the present invention is, is provided for the rotor arrangement of motor, although wherein use block permanent magnet cheaply, still can realize magnetic flux density high in air gap.
This task is by solving according to the rotor arrangement for motor of claim 1 and by the motor of basis claim arranged side by side.
Favourable design in addition of the present invention illustrates in the dependent claims.
According to first aspect, a kind of rotor arrangement for the motor that rotates is provided, comprising:
-multiple pole shoes, they are corresponding is maintained at magnetic conductance district (R ü ckschlussbereich) by brace and locates; With
-block permanent magnet, it arranges and the radially outer surface extension towards rotor arrangement between magnetic conductance district between corresponding two pole shoes, and wherein the direction of magnetization of permanent magnet is upwards directed the setting party of pole shoe;
Wherein, at least one permanent magnet has multiple sections, and the second segment that wherein approaches the setting of magnetic conductance district has the tangential thickness less than the first paragraph away from magnetic conductance district of permanent magnet.
The thought of rotor arrangement is above, permanent magnet with multiple sections of ground or many parts be provided with different tangential thickness, wherein compare away from the section of pivot center and there is less tangential thickness towards the section of pivot center.
Can amplify by this way permanent magnet in rotor arrangement, extend process radical length and especially on the whole radical length between magnetic conductance district and air gap, provide permanent magnet.Can in pole shoe, realize thus the magnetic flux density of maximum possible and can make the resistance of (away from pivot center) section that approaches air gap of permanent magnet be improved compared with large tangential width by it simultaneously.
In addition permanent magnet can abut in magnetic conductance district with side.
In addition permanent magnet can finish at the magnetic pole gap place between two pole shoes with side.
According to a kind of execution mode, the tangential thickness of the first paragraph of permanent magnet can be greater than to be greater than 1.5 the factor the tangential thickness of the second segment of permanent magnet.
In addition the radial width of the second segment of permanent magnet can be between 0.25 and 0.75 for the width ratio between total radial width of permanent magnet.
Can stipulate permanent magnet many parts and arrange, to form described section.
Each permanent magnet of rotor arrangement can be of similar shape, wherein the tangential thickness of second segment is so selected, make to retain a brace between adjacent second segment, this brace has transversal section, makes the magnetization of magnetic field second segment by permanent magnet in brace in magnetic saturation.
According to another aspect, a kind of motor is set, it has stator apparatus and above-mentioned rotor arrangement for stator field is provided.
Accompanying drawing explanation
Describe preferred embodiment of the present invention in detail by accompanying drawing below.In accompanying drawing:
Fig. 1 is the schematic cross section of motor;
Fig. 2 amplifies the intercepting part of two pole shoes of the rotor arrangement that motor shown in Fig. 1 is shown, the magnetic field line shown in having; With
Fig. 3, to represent the another kind of execution mode of rotor arrangement of motor corresponding to the view of Fig. 2, has the different width ratio of the section of permanent magnet.
Embodiment
Schematic cross section traditional rotation, motor 1 permanent-magnet-field, that there is internal rotor that Fig. 1 shows.Motor 1 has the stator 2 of tubular.Stator 2 comprises the stator magnetic conductance district 21 of the magnetic of tubular, equidistantly defines the internal recess 3 of a same tubular from it at the radially inside end that points to ground projection and inwardly point to it of the stator tooth 22 upwards arranging in week.Stator tooth 22 is provided with tooth top 23 on its radially inner end, and tooth top has outline circular arc, spill.Stator tooth 22 is provided with (not shown) stator coil, can produce stator field by stator coil in the time switching on.。
In internal recess 3, on axle 5, be provided with rotationally the rotor 4 (rotating part of motor 1) of a same tubular as rotor arrangement.Rotor 4 has rotor body 41, and rotor body is provided with pole shoe 42, and pole shoe is connected with the magnetic conductance district 44 that surrounds axle 5 by (on tangential) narrow brace 43.
Brace 43 is preferably so chosen size, makes them have enough mechanical stability, to resist the centrifugal force of radial effect and maintain in the cross force of tangential effect the pole shoe 42 of outwards widening in the time of acceleration or brake motor.In addition brace 43 is so chosen size, makes it have enough little cross section, so that the magnetic flux that passes through magnetic conductance district 44 causing by permanent magnet 7 keeps as far as possible littlely.Be necessary especially, the part magnetic flux that flows through brace 43 of permanent magnet 7 is enough to the magnetic flux density in brace 43 to remain in saturation condition.
Groove 6 is set between pole shoe 42, in it, holds permanent magnet 7.For outside limiting groove 6 diametrically, pole shoe 42 has projection 45, described projection be tangentially overlapped on the permanent magnet 7 of groove 6 interior settings and by its also resist reliably effect in the time that rotor 4 rotates centrifugal force remain in groove 6.Groove 6 preferably tangentially has width, to hold corresponding permanent magnet 7, permanent magnet is abutted on the side of pole shoe 42 with its pole-face.The end respect to one another of projection 45 has interval, and in this interval, the respective side of permanent magnet 7 is exposed, and makes to have constructed magnetic pole gap between pole shoe.
This motor 1 for example moves in electro-motor mode, mode is, so switch on to stator coil, make to produce around stator field, this stator field is with the exciting field change action that caused by pole shoe 42 by permanent magnet 7 and thus torque is applied on rotor 4.
Permanent magnet 7 is conventionally by processing and manufacture and then obtain sintering ferrite dust material pressure, and wherein ferrite material is being awarded anisotropy of magnetic susceptibility and then in anisotropic direction, the material that obtains sintering is being magnetized by applying magnetic field during pressure processing.Permanent magnet 7 preferably provides with square shape with bulk for manufacturing simple reason, and its pole orientation is tangentially that is perpendicular to the boundary face between pole shoe 42 and groove 6.
The groove 6 of rotor 4 has the permanent magnet 7 of two sections 61,62 constructs for holding, to hold the permanent magnet 7 with corresponding first paragraph 71 and corresponding second segment 72.The first paragraph 71 of permanent magnet 7 approaches the air gap setting between rotor 4 and stator apparatus 2 in the radially outer position of rotor arrangement 4.72 of the second segments of contrary permanent magnet 7 approach magnetic conductance district 44 away from air gap and arrange around axle 5.The second segment 72 of permanent magnet 7 can not be that the side of magnetic pole strength is directly in abutting connection with magnetic conductance district 44 with one in one embodiment.
The tangential thickness d of the first paragraph 71 of permanent magnet 7
0than the tangential thickness d of the second segment of permanent magnet 7 72
igreatly.The section 71,72 of permanent magnet 7 with preferably extend transverse to radial direction, corresponding to the side of magnetic pole strength not against each other, thereby in cross section transverse to the step-like shape of the axial formation permanent magnet 7 of rotor arrangement 4.
In Fig. 2, be shown specifically the intercepting part of the amplification of the rotor arrangement 4 of motor 1, there is the distribution of passing through pole shoe 42 and the magnetic flux by permanent magnet 71,72 by magnetic field line.Can find out, magnetic field line shows enough magnetic flux densities in the region that approaches air gap in the first paragraph 71 of permanent magnet 7, so that there will not be the danger of degaussing in this region.This enough thickness tangentially by first paragraph 71 is realized.The radical length maximum of permanent magnet 7 simultaneously, because it extends until magnetic pole gap from magnetic conductance district 44.
In illustrated embodiment, the first paragraph 71 of permanent magnet 7 has radial width w
0and the second segment 72 of permanent magnet 7 has radial width w
i, they equate substantially.There is approximately 0.5 width and compares w
0/ (w
0+ w
i).In this external illustrated embodiment, the first paragraph 71 of permanent magnet 7 has tangential thickness d
0and the second segment 72 of permanent magnet 7 has tangential thickness d
i, wherein thickness d
0significantly be greater than thickness d
i.Diagram Thickness Ratio d
0/ d
ibe about 1.5.Preferably select Thickness Ratio to be greater than 1.25, be especially greater than 1.5.In addition Thickness Ratio should not exceed 2.Especially preferable width compares w
0/ (w
0+ w
i) between 0.25 and 0.75, be especially 1.5 or larger width compare d
0/ d
i.
Shown in Fig. 3, according to the intercepting part of the rotor arrangement of another kind of execution mode, wherein the first paragraph 71 of permanent magnet 7 has the radial width w different from the execution mode of Fig. 2
0.Compare w with radial width in Fig. 2
0/ (w
0+ w
i) be that 0.5 execution mode is contrary, it is 0.33 in the execution mode of Fig. 3, that is to say that the second segment of permanent magnet 7 has the significantly more radial width of large (twice) than first paragraph 71
Be all mutually prerequisite so that the magnet material of permanent magnet is identical with magnetization, 1.5 or larger Thickness Ratio situation under, 0.33 width than enough realization prevent the needed protection of degaussing.
In addition by multiple sections 71,72 of the different tangential thickness of having of permanent magnet 7 are set, compared with prior art can improve the first-harmonic (Grundwelle) of the gap field of the motor of constructing with this rotor arrangement.
Claims (10)
1. for the rotor arrangement (4) of electric rotating machine (1), comprising:
-multiple pole shoes (42), described pole shoe is corresponding is maintained at place of magnetic conductance district (44) by brace (43); With
Permanent magnet (7)-bulk or square shape, described permanent magnet is arranging between corresponding two pole shoes (42) and the outer surface extension towards rotor arrangement (4) diametrically between magnetic conductance district (44), and wherein the direction of magnetization of permanent magnet (7) is along the setting party of pole shoe (42) to orientation;
It is characterized in that,
At least one permanent magnet (7) has multiple sections (71,72), wherein approaches the first paragraph away from magnetic conductance district (44) (71) that second segment (72) that magnetic conductance district (44) arranges compares permanent magnet (7) and has less tangential thickness.
2. rotor arrangement according to claim 1 (4), wherein, permanent magnet (7) abuts in magnetic conductance district (44) with side.
3. rotor arrangement according to claim 1 and 2 (4), wherein, with side, the magnetic pole gap place between two pole shoes (42) finishes permanent magnet (7).
4. according to the rotor arrangement one of claim 1 to 3 Suo Shu (4), wherein, the tangential thickness d of the first paragraph (71) of permanent magnet (7)
0be greater than the tangential thickness d of the second segment of permanent magnet (7) to be greater than 1.5 the factor
i.
5. according to the rotor arrangement one of claim 1 to 4 Suo Shu (4), wherein, the radial width of the second segment (72) of permanent magnet (7) compares between 0.25 and 0.75 for the width between total radial width of permanent magnet (7).
6. according to the rotor arrangement one of claim 1 to 5 Suo Shu (4), wherein, permanent magnet (7) many parts ground arranges, to form section (71,72), its stage casing (71,72) especially have different material behaviors as independent permanent magnet and manufacture.
7. according to the rotor arrangement one of claim 1 to 5 Suo Shu (4), wherein, each permanent magnet (7) of rotor arrangement (4) is of similar shape, wherein the tangential thickness of second segment (72) is so selected, make to retain a brace (43) between adjacent second segment (72), this brace has transversal section, makes the magnetization of magnetic field second segment (72) by permanent magnet (7) in this brace (43) in magnetic saturation.
8. according to the rotor arrangement one of claim 1 to 5 Suo Shu (4), wherein, the section of permanent magnet (7) (71,72) especially has identical material behavior as the ferrimagnet of sintering and makes.
9. according to the rotor arrangement one of claim 1 to 8 Suo Shu (4), wherein, whole permanent magnet (7) radially than tangentially more longways structure, and permanent magnet (7) especially arranges to spoke-like in rotor, preferably in radially outwardly open groove.
10. motor (1), has stator apparatus (2) for stator field is provided and according to the rotor arrangement one of claim 1 to 9 Suo Shu (4).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102012218995.5 | 2012-10-18 | ||
| DE201210218995 DE102012218995A1 (en) | 2012-10-18 | 2012-10-18 | Rotor assembly for permanent magnet-energized rotary electric machine, has permanent magnets whose tangential thickness of portion near to the rear end region is smaller than portion far from the rear end region |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103779989A true CN103779989A (en) | 2014-05-07 |
Family
ID=50436962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310637467.2A Pending CN103779989A (en) | 2012-10-18 | 2013-10-17 | Rotor device for permanent magnet-excited motor |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN103779989A (en) |
| DE (1) | DE102012218995A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016192581A1 (en) * | 2015-05-29 | 2016-12-08 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent magnet motor rotor and permanent magnet synchronous motor |
| CN110474456A (en) * | 2019-08-30 | 2019-11-19 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent-magnetic synchronous motor rotor and compressor with it |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112600327B (en) * | 2020-12-09 | 2022-07-29 | 珠海格力电器股份有限公司 | Permanent magnet synchronous motor and washing machine |
| US12040662B2 (en) * | 2021-05-18 | 2024-07-16 | Nidec Motor Corporation | Spoked rotor having sectioned, high volume magnets |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6048371U (en) * | 1983-09-09 | 1985-04-05 | 株式会社日立製作所 | rotor |
| US5886441A (en) * | 1993-02-15 | 1999-03-23 | Fanuc, Ltd. | Rotor for synchronous motor |
| CN2376129Y (en) * | 1999-05-14 | 2000-04-26 | 路子明 | Rotor structure of permasyn motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2791483B1 (en) * | 1999-03-22 | 2004-06-25 | Valeo Equip Electr Moteur | ROTATING MACHINE COMPRISING MAGNETS OF DIFFERENT COMPOSITIONS |
-
2012
- 2012-10-18 DE DE201210218995 patent/DE102012218995A1/en not_active Withdrawn
-
2013
- 2013-10-17 CN CN201310637467.2A patent/CN103779989A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6048371U (en) * | 1983-09-09 | 1985-04-05 | 株式会社日立製作所 | rotor |
| US5886441A (en) * | 1993-02-15 | 1999-03-23 | Fanuc, Ltd. | Rotor for synchronous motor |
| CN2376129Y (en) * | 1999-05-14 | 2000-04-26 | 路子明 | Rotor structure of permasyn motor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016192581A1 (en) * | 2015-05-29 | 2016-12-08 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent magnet motor rotor and permanent magnet synchronous motor |
| CN110474456A (en) * | 2019-08-30 | 2019-11-19 | 珠海格力节能环保制冷技术研究中心有限公司 | Permanent-magnetic synchronous motor rotor and compressor with it |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102012218995A1 (en) | 2014-04-24 |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20140507 |
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