EP4248550A1 - Rotor für eine elektrische maschine - Google Patents
Rotor für eine elektrische maschineInfo
- Publication number
- EP4248550A1 EP4248550A1 EP21816003.4A EP21816003A EP4248550A1 EP 4248550 A1 EP4248550 A1 EP 4248550A1 EP 21816003 A EP21816003 A EP 21816003A EP 4248550 A1 EP4248550 A1 EP 4248550A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- delimiting
- rotor
- circumferential direction
- recess
- permanent magnet
- 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.)
- Withdrawn
Links
- 241000446313 Lamella Species 0.000 claims description 16
- 238000003475 lamination Methods 0.000 abstract description 5
- 230000004907 flux Effects 0.000 description 8
- BGPVFRJUHWVFKM-UHFFFAOYSA-N N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] Chemical compound N1=C2C=CC=CC2=[N+]([O-])C1(CC1)CCC21N=C1C=CC=CC1=[N+]2[O-] BGPVFRJUHWVFKM-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000005284 excitation Effects 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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]
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/03—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
-
- 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
Definitions
- the invention relates to a rotor for an electrical machine.
- DE 102007 029 719 A1 discloses a rotor with a large number of lamellae stacked on top of one another, in which recesses are introduced for receiving permanent magnets.
- the magnetic field of the permanent magnets forms the excitation field, which interacts with a magnetic field on the stator side, which is generated in coils that can be energized.
- the permanent magnets are designed as buried magnets and are delimited in the recesses radially outwards, radially inwards and as well as in both circumferential directions by the material of the lamellae.
- Cogging torques can arise in electrical machines with such rotors, which lead to torque ripples. Efforts are made to reduce the torque ripple through design measures.
- the rotor according to the invention can be used in electrical machines such as electric motors, in particular as brushless DC motors with electronic commutation.
- the rotor comprises a lamella package with a plurality of laminations lying on top of one another, which are preferably in the form of sheet metal laminations and are distributed over the circumference have several recesses, in each of which a permanent magnet is accommodated.
- the recesses are located within the outer circumference of each lamella and are each radially spaced from the outer circumference.
- the permanent magnets generate an excitation field which, during operation of the electrical machine, interacts with a stator field which is generated in the stator in coils which can be energized.
- each lamella On the outer circumference of each lamella, the recesses are each delimited radially outwards by a boundary wall of the lamella.
- This delimiting wall of the lamella is adjoined in the circumferential direction by delimiting webs which are formed in one piece with the delimiting wall and are radially thinner than the delimiting wall.
- a boundary wall and a boundary web thus alternate in each case in the circumferential direction.
- the maximum radial thickness of the boundary walls is greater than the radial thickness of the boundary webs.
- the outside of the delimiting wall of the lamella, which delimits the recess, forms the rotor radius. Accordingly, the boundary wall has a curvature on its outside which exactly forms the rotor radius.
- the outside of the delimiting webs adjoining in the circumferential direction lies radially inside the rotor radius and has a radial spacing from the rotor radius.
- the permanent magnets can be placed relatively far radially outwards in the recesses, which ensures high efficiency of the electrical machine.
- the delimiting webs due to the flattening of the delimiting webs, which are located radially inside the rotor radius and are at a radial distance from the rotor radius, there is a lower magnetic flux density at this position.
- the air gap between the outside of the flattened delimitation ridges and the rotor radius reduces the flux density.
- the delimiting webs are designed to be radially thinner than the delimiting wall, which delimits the recess, and are therefore magnetically saturated more quickly.
- the outside of the delimiting webs is partially or completely straight.
- the straightness of the narrow delimiting webs advantageously extends between two delimiting walls which follow one another in the circumferential direction and which each delimit a recess in the lamella radially outwards.
- the outside of a delimiting web has the greatest radial distance from the rotor radius. Accordingly, the magnetic flux density is smallest at this point.
- convex designs of the outside with an outwardly directed curvature can also be considered.
- concave design of the outside of the delimiting webs with an inward curvature can also be considered.
- the radial distance between the outside of the delimiting webs and the rotor radius is at least 1%, based on the rotor radius.
- radial clearances of 2%, 3%, 4%, 5% or greater between the clearance of the outside of the delimiting lands and the rotor radius.
- the delimiting webs overlap in the circumferential direction an end section of the permanent magnet which sits in the recess, with each delimiting web lying at a distance from the permanent magnet on both sides of the end section of the permanent magnet.
- the boundary wall completely delimits the radially outer side of the recess and accordingly no such air space is present in the recess when the permanent magnet is inserted.
- the delimiting webs merge into the delimiting wall at the level of the end section of the permanent magnet.
- the delimiting web has a constant or at least approximately constant radial thickness over its length—seen in the circumferential direction. This ensures that the magnetic saturation is adjusted evenly over the length of the delimitation bar.
- the boundary wall which is arranged between two lateral boundary webs and delimits the radially outer side of the recess, has a maximum radial extent that is at least three times the radial thickness of the boundary web. This ensures that the delimiting webs have a relatively small wall thickness.
- the permanent magnet has a rectangular cross-sectional geometry.
- the recess in the lamellae also has a rectangular basic cross-sectional geometry, it being possible for extensions to be present on one or more sides of the recess.
- the recess has a longitudinal extent in the circumferential direction.
- the extensions can be present, which are delimited radially outwards by the delimiting webs.
- a longitudinal extent of the recess in the circumferential direction a longitudinal extent of the recess in the radial direction can also be considered.
- FIG. 1 shows a plan view of a rotor for an electrical machine, consisting of a lamella pack with a large number of lamellae lying on top of one another, with recesses in which permanent magnets are inserted,
- FIG. 2 shows an enlarged detail from FIG. 1 in the area between two adjacent recesses, each with a permanent magnet
- FIG. 3 shows a representation corresponding to FIG. 1, but in a design variant.
- a rotor 1 for an electrical machine.
- the rotor 1 comprises a disk pack with a multiplicity of axially stacked disks 2, each of which has an identical structure.
- Each lamella 2 has a total of six rectangular recesses 3 distributed over the circumference, in each of which a permanent magnet 4 is accommodated.
- the permanent magnets 4 have a rectangular cross-sectional geometry with a longitudinal extent in the circumferential direction.
- the recesses 3 into which the permanent magnets 4 are inserted also have a rectangular basic cross-sectional geometry.
- a clamping element can be used, which applies a clamping force to the permanent magnet 4 and thereby secures it in the recess 3 .
- Each recess 3 is delimited radially outwards by a delimiting wall 7 of the lamella 2 .
- the outside of the boundary wall 7 coincides with the outside of the rotor and accordingly has the rotor radius rR O t.
- each boundary wall 7 is adjoined on both circumferential sides by boundary webs 8, which are also part of the outside of the rotor 1, the outside of the boundary webs 8 being set back radially .
- the outer side of the delimiting web 8 is flattened and preferably designed to be straight over the length in the circumferential direction.
- the delimiting bar 8 is formed in one piece with the delimiting wall 7 so that the ends of the delimiting bar 8 merge into an adjoining delimiting wall 7 .
- the end extensions 5 of the recess 3 are overlapped radially outwards by the delimiting web 8 .
- the delimiting web 8 also has a radially extending foot 9 with which the delimiting web 8 is formed in one piece and is connected in one piece to a central section of the lamella 2 via the delimiting web 8 .
- the foot 9 extends between two end extensions 5 of adjacent recesses 3.
- the radial thickness of the delimiting webs 8 is significantly less than the maximum radial thickness of the delimiting wall 7.
- the greatest radial extension of the delimiting wall 7 is at least three times, optionally at least four times or at least five times the radial thickness of the delimiting web 8. Because of this difference, the limiting web 8 quickly into magnetic saturation.
- the radial distance Ar between the rotor radius rR O t and the outside of the delimitation web 8 is also at least 1% of the rotor radius rRot.
- 3 shows an embodiment variant of a rotor 1 which, just like in the first exemplary embodiment according to FIGS. 1 and 2, is constructed from a large number of identical laminations 2 stacked on top of one another.
- the slats 2 have the same basic structure as in the first exemplary embodiment. What is different, however, is the shape of the end extensions 5 on the recesses 3 and the extension of the delimiting webs 8, which delimit the recesses 5 together with the delimiting wall 7 radially outwards.
- the extensions 5 and the delimiting webs 8 each overlap an end section 10 of the permanent magnet 4 in the recess 3. Accordingly, the length of the delimiting wall 7 in the circumferential direction is reduced compared to the first exemplary embodiment.
- the additional air space formed by the enlarged design of the extension 5 on the radial outside of the permanent magnet 4 results in lower flux losses and a higher flux density, which improves efficiency.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102020214511.3A DE102020214511A1 (de) | 2020-11-18 | 2020-11-18 | Rotor für eine elektrische Maschine |
PCT/EP2021/082127 WO2022106532A1 (de) | 2020-11-18 | 2021-11-18 | Rotor für eine elektrische maschine |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4248550A1 true EP4248550A1 (de) | 2023-09-27 |
Family
ID=78819517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21816003.4A Withdrawn EP4248550A1 (de) | 2020-11-18 | 2021-11-18 | Rotor für eine elektrische maschine |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4248550A1 (de) |
CN (1) | CN116648842A (de) |
DE (1) | DE102020214511A1 (de) |
WO (1) | WO2022106532A1 (de) |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003081748A1 (de) * | 2002-03-22 | 2003-10-02 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Innenläufermotor |
EP1458077A1 (de) * | 2003-03-12 | 2004-09-15 | ebm-papst St. Georgen GmbH & Co. KG | Mehrphasiger Elektromotor welcher einen Rotor mit eingebetteten Permanentmagneten aufweist |
DE102007029719A1 (de) | 2007-02-01 | 2008-08-07 | Robert Bosch Gmbh | Elektrische Maschine |
ITPN20120005A1 (it) * | 2012-01-25 | 2013-07-26 | Nidec Sole Motor Corp S R L | Motore elettrico a magneti permanenti con rotore perfezionato |
DE202013012708U1 (de) * | 2013-03-19 | 2018-09-19 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Elektromotor mit Innenrotor und Außenstator |
CN105186816B (zh) * | 2015-07-16 | 2018-08-03 | 博格思众(常州)电机电器有限公司 | 定子和转子的组合结构 |
CN109980814A (zh) * | 2017-12-28 | 2019-07-05 | 丹佛斯(天津)有限公司 | 内置式永磁电机转子和永磁电机 |
-
2020
- 2020-11-18 DE DE102020214511.3A patent/DE102020214511A1/de active Pending
-
2021
- 2021-11-18 CN CN202180085856.1A patent/CN116648842A/zh active Pending
- 2021-11-18 WO PCT/EP2021/082127 patent/WO2022106532A1/de active Application Filing
- 2021-11-18 EP EP21816003.4A patent/EP4248550A1/de not_active Withdrawn
Also Published As
Publication number | Publication date |
---|---|
CN116648842A (zh) | 2023-08-25 |
DE102020214511A1 (de) | 2022-05-19 |
WO2022106532A1 (de) | 2022-05-27 |
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