EP4022741A1 - Active part of an electric machine, electric machine, and method for producing a pre-mounted assembly for the active part - Google Patents
Active part of an electric machine, electric machine, and method for producing a pre-mounted assembly for the active partInfo
- Publication number
- EP4022741A1 EP4022741A1 EP20754160.8A EP20754160A EP4022741A1 EP 4022741 A1 EP4022741 A1 EP 4022741A1 EP 20754160 A EP20754160 A EP 20754160A EP 4022741 A1 EP4022741 A1 EP 4022741A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- base body
- active part
- fastening
- sheet metal
- permanent magnets
- 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- Withdrawn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
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
-
- 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
- H02K1/28—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures
-
- 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
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/17—Stator cores with permanent magnets
-
- 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
- H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
- H02K15/02—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
- H02K15/03—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies having permanent magnets
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K21/00—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets
- H02K21/12—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets
- H02K21/14—Synchronous motors having permanent magnets; Synchronous generators having permanent magnets with stationary armatures and rotating magnets with magnets rotating within the armatures
-
- 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
- H02K2213/12—Machines characterised by the modularity of some components
Definitions
- the invention relates to an active part designed as a rotor or stator of an electrical machine's rule, with a base body and a plurality of permanent magnets attached to / in the base body.
- the invention also relates to a corresponding electrical machine, a procedural Ren for producing a preassembled assembly for attaching at least egg nes permanent magnet to the base body of an active part of an electrical Ma machine and the use of such preassembled assemblies.
- Such active parts that is to say rotors or stators
- active parts which have a plurality of permanent magnets fastened on / in the base body
- the document EP 2 149965 A1 shows a rotor (rotor) of a permanently excited Syn chron machine, in which the permanent magnets are attached via a steel bandage wound around the base body and permanent magnets.
- the document DE 102017203736 A1 shows an electric Maschi designed as an electric motor with an internal rotor (internal rotor), which has a basic body Mais Deten as a laminated core, permanent magnets arranged on the outer circumference of the basic body and a circumferentially surrounding the laminated core and the permanent magnets de rotor receiving sleeve.
- the permanent magnets are on the rotor receiving sleeve and between the permanent magnets formed by the laminated core holding devices in / fixed on the laminated core.
- the document DE 202018 102332 U1 shows a rotor of an external rotor motor with a base body that is designed as a laminated return ring and with permanent magnets attached to it.
- the return ring has radial recesses and subsequent bending legs for fastening the permanent magnets.
- this active part of the electrical machine has one or more fastening devices made of sheet metal, each having at least one the permanent magnets and through which the permanent magnets are attached to / in the base body.
- fastening devices are preferably provided.
- the electrical machine is in particular a permanent magnet synchronous machine.
- holding is to be understood as a moving hold, similar to the setting of precious stones on pieces of jewelery.
- the production of the corresponding “setting” for the permanent magnets is usually different to the classic gemstone setting, in which the metal is driven over the stone to be set.
- pre-assembled assemblies of permanent magnets and these permanent magnets (one) fastening devices can be formed, which can be fastened to the base body of the active part via the sheet metal fastening devices.
- the active part of the electrical machine can be constructed in a relatively simple and convenient manner.
- the respective arrangement of at least one permanent magnet and a fastening device engaging at least one permanent magnet form a pre-assembled assembly which is fastened on / in the base body.
- Such an assembly is significantly easier to handle when assembling the active part of the electrical machine than the individual permanent itself.
- each of the permanent magnets is individually fastened to / in the base body via one of the fastening devices made of sheet metal.
- the preassembled assembly thus includes exactly one permanent magnet per fastening device (gripping these permanent magnets).
- the respective fastening device has a fastening part via which the arrangement is fastened on / in the base body.
- the fastening part in turn has one or more fastening structures.
- the fastening can take place non-positively and / or positively and / or materially.
- recesses are designed in the base body, into which at least a part of the respective arrangement engages and forms a permanent / permanent joint with the base body there.
- This at least part of the respective arrangement is in particular the fastening part of the corresponding fastening device.
- the preassembled subassembly from a fastening with an arrangement of the permanent magnet and one of these permanent magnets - production device is formed from sheet metal and wherein the method comprises the following steps:
- a fastening part of the fastening device is formed during the molding process, by means of which the arrangement can be fastened to / in the base body.
- preassembled assemblies according to the invention which are formed by orders of one fastening device and at least one permanent magnet captured by this respective fastening device, to build an active part of an electrical machine designed as a rotor or stator, the preassembled assemblies are on / in a Base body of the active part attached.
- recesses are formed in the base body, into which at least a part of the respective arrangement, in particular a fastening part of the fastening device, engages and forms a press connection there with the base body.
- Fig. 1 the two active parts of an electrical machine, the one active part having permanent magnets and is carried out according to a first preferred embodiment of the invention
- Fig. 2 the process steps for Fier ein a single fastening device for folding one of the permanent magnets on the base body of the egg NEN active part shown in Fig. 1 and the setting of this permanent magnet in a holding part of this fastening device,
- Fig. 3 the two active parts of an electrical machine, wherein the one active part has permanent magnets and is designed according to a second preferred embodiment of the invention and
- Fig. 4 the process steps for Fier ein a single fastening device for folding one of the permanent magnets on the base body of the egg NEN active part shown in Fig. 3 and the setting of this permanent magnet in a holding part of this fastening device.
- Fig. 1 shows the two active parts 10, 12 of an electrical machine 14.
- a sol surface electrical machine 14 can be designed as an electric motor, as a generator or as a Motorge generator.
- the first active part 10 of the electrical machine 14 is designed as a rotor 16 (also called a rotor) and the second active part 12 of the electrical machine 14 is designed as a stator 18 (also called a stator).
- the rotor 16 is rotatably supported with respect to an axis 20 in a housing (not shown) of the electrical machine 14.
- the rotor 16 and stator 18 are arranged coaxially with respect to the axis 20. There is an air gap between them.
- the electrical machine 14 shown here is designed as an internal rotor machine, i.e. its rotor 16 is arranged radially inside the stator 18 with respect to the axis 20.
- the electrical machine 14 shown here is a permanent magnet synchronous machine.
- the base body 22 of the stator 18 is shown, which has an annular or sleeve-shaped yoke 24 and teeth 26 facing radially inward for windings (not shown) of the stator 18.
- the base body 22 is formed, for example, by a laminated core.
- the rotor 16 also has a base body 28, on the outer circumference 30 of which permanent magnets 32 are attached.
- the fastening takes place via a plurality of fastening devices 34 made of sheet metal enclosing one of the permanent magnets 32 each, that is to say sheet metal fastening devices by means of which the permanent magnets 32 are fastened to the base body 28.
- This base body 28 is also formed, for example, by a laminated core.
- a respective arrangement 32, 34 results from one of the permanent magnets 32 and a fastening device 34 which grips this permanent magnet 32, where in this arrangement a preassembled (sub) subassembly which is fastened to the base body 28 is formed.
- Each of the fastening devices 34 has a holding part 36 which grasps and thus holds the corresponding permanent magnet 32, as well as a fastening part 38 with at least one fastening structure via which the arrangement 32, 34 is fastened on / in the base body 28.
- the outer circumference 30 of the Grundkör pers 28 (of the active part 10 of the electrical machine 14) is provided with permanent magnets 32 over the entire circumference with respect to the axis 20. These have an alternating magnetic polarity as seen in the circumferential direction.
- the permanent magnets 32 can consist of different materials regardless of the machine type, namely: steel, aluminum-nickel-cobalt (AINiCo magnets), bismanol, ferrites, rare earth materials (rare earth magnets) such as neodymium iron Boron, samarium cobalt, etc.
- electrical machines 14 for automotive applications space-optimized designs are predominantly to be found, be it in the segment of small drives or in the segment of traction drives. Due to the requirement to construct space-optimally, electrical machines 14 with a high hen power density is used. As shown in the example here, permanent magnet synchronous machines with rare earth materials are often used.
- FIG. 2 shows the individual steps or partial steps (a) to (h) for producing an individual fastening device 34 for holding one of the permanent magnets 32 on the base body 28 of the first active part 10 shown in FIG Holding part 36 of this fastening device 34.
- step (a) the initial situation, there is a corresponding flat sheet metal workpiece 42 punched in the form.
- step (b) retaining tabs 44 are created at the ends of the sheet metal workpiece 42.
- the sheet metal workpiece 42 is then bent into a U-shape in steps (c) and (d) and is thereby preformed.
- step (e) the corresponding permanent magnet 32 is introduced into the preformed sheet metal workpiece 42.
- the retaining tabs 44 already overlap the permanent magnet 32.
- step (f) the U-shape of the preformed sheet metal workpiece 42 below the permanent magnet 32 is provided with a type of constriction that divides the preformed sheet metal workpiece 42 into two parts.
- the upper part with the permanent magnet 32 held therein is formed into the holding part 36 by means of the further steps (g) and (h), and the lower part is formed into the fastening part 38.
- step (g) the constriction is further reduced, so that the holding part 36 is formed, and in step (h) a T-shaped central fastening structure of the fastening part 38 is formed.
- the fastening device 34 is thus completely formed from the preformed sheet metal workpiece 42.
- the resulting arrangement of permanent magnet 32 and fastening device 34 forms said pre-assembled subassembly for constructing the active part 10, embodied as a rotor 16, of the electrical machine 14 shown in FIG. 1.
- FIG. 3 shows the two active parts 10, 12 of a further variant of the electrical machine 14. This only differs in details of the first active part 10 from the electrical machine shown in FIG. 1. In the following, therefore, only the differences will be discussed.
- the fastening devices 34 have a modified shape in the area of their fastening parts 38, which enables the preassembled assemblies to be alternatively preassembled in a chain-like manner and then "slipped" onto the active part 10, which simplifies the fastening process.
- the preassembled assemblies produced in this way are now used to assemble the active part 10 of the electrical machine 14, which is designed as a rotor 16.
- the preassembled assemblies are attached to the outer circumference 30 of the base body 28 of the active part 10 as follows:
- Recesses 40 are formed in the base body 28, into which at least the fastening part 38 of the fastening device 34 is brought and pressed there so that it forms a press connection there with the base body 28. In this way, all permanent magnets 32 are attached to the base body 28 of the first active part 10 of the electrical machine's rule.
- Fig. 4 shows the individual steps (a) to (h) for Fier ein a single Be fastening device 34 for folding one of the permanent magnets 32 on the base body 28 of the first active part 10 shown in Fig. 3 and the setting of this Per manentmagneten 32 in the Holding part 36 of this fastening device 34.
- Steps (a) to (d) for preforming the sheet metal workpiece 42 are identical to steps (a) to (d) shown in FIG. 2.
- step (e) the corresponding permanent magnet 32 is introduced into the pre-formed sheet metal workpiece 42 and the base of the U-shape is additionally indented inward.
- the retaining tabs 44 already overlap the permanent magnet 32.
- step (f) the dent in the base of the U-shape of the preformed sheet metal workpiece 42 is enlarged until it reaches the permanent magnet.
- An upper and a lower part are created again.
- the upper part with the permanent magnet 32 held therein is made by means of the further steps (g) and (h) formed into the holding part 36 and the lower part is formed into the fastening part 38 ge.
- step (g) the dent is enlarged until it clings to the permanent magnet and the holding part 36 is formed. This arise in the 39be rich of the fastening part 38 each have a tongue. These tongues are now formed into two fastening structures of the fastening part 38 in step (h). So that the fastening device 34 Be is completely out of the preformed sheet metal workpiece 42 is formed.
- the resulting arrangement of permanent magnet 32 and fastening device 34 forms said preassembled subassembly for constructing active part 10, embodied as rotor 16, of electrical machine 14 shown in FIG. 3.
- the sheet metal workpieces 42 which mechanically grip the permanent magnets 32, grip around and thus fix them, are first punched out and cold-formed.
- the (sub) assemblies Magnetic net 32 and sheet metal workpiece 42) can then be pressed into the rotor assembly of the rotor 16.
- the method is suitable for a variety of possible magnet shapes of the permanent magnets 32;
- the overlap area can be adjusted according to the requirements, which allows the magnetic air gaps to be made smaller;
- the "retaining plate” has a better magnetic flux-conducting material constant than an adhesive; the thermal conductivity in the rotor 14 is improved; the permanent magnets 32 are mechanically protected when they are pressed into the rotor 16, so that the protective surfaces are not damaged. As a result, simpler and cheaper surface treatments of the permanent magnets 32 are also possible.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Permanent Field Magnets Of Synchronous Machinery (AREA)
- Manufacture Of Motors, Generators (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019122969.3A DE102019122969A1 (en) | 2019-08-27 | 2019-08-27 | Active part of an electrical machine, electrical machine and method for producing a preassembled assembly for the active part |
PCT/DE2020/100665 WO2021037301A1 (en) | 2019-08-27 | 2020-07-27 | Active part of an electric machine, electric machine, and method for producing a pre-mounted assembly for the active part |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4022741A1 true EP4022741A1 (en) | 2022-07-06 |
Family
ID=72046667
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20754160.8A Withdrawn EP4022741A1 (en) | 2019-08-27 | 2020-07-27 | Active part of an electric machine, electric machine, and method for producing a pre-mounted assembly for the active part |
Country Status (5)
Country | Link |
---|---|
US (1) | US20220329120A1 (en) |
EP (1) | EP4022741A1 (en) |
CN (1) | CN114287102A (en) |
DE (1) | DE102019122969A1 (en) |
WO (1) | WO2021037301A1 (en) |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000116038A (en) * | 1998-09-29 | 2000-04-21 | Mitsubishi Electric Corp | Rotor for permanent magnet rotating machine |
EP2149965A1 (en) | 2008-08-01 | 2010-02-03 | Siemens Aktiengesellschaft | Rotor of a synchronous machine with permanent magnets |
US9515529B2 (en) * | 2009-08-18 | 2016-12-06 | Northern Power Systems, Inc. | Method and apparatus for permanent magnet attachment in an electromechanical machine |
US20120187793A1 (en) * | 2009-09-29 | 2012-07-26 | Siemens Aktiengesellschaft | Rotor |
DE102010048310A1 (en) * | 2010-10-14 | 2012-04-19 | Continental Automotive Gmbh | Rotor for an electric motor |
US9601951B2 (en) * | 2013-11-04 | 2017-03-21 | General Electric Company | Modular permanent magnet motor and pump assembly |
EP2930825A1 (en) * | 2014-04-11 | 2015-10-14 | Siemens Aktiengesellschaft | Mounting of permanent magnets on a rotor of an electric machine |
DE102017203736A1 (en) | 2017-03-07 | 2018-09-13 | Mahle International Gmbh | electric motor |
DE102017216094A1 (en) * | 2017-09-12 | 2019-03-14 | Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg | Rotor of an electric motor and electric motor |
DE202018102332U1 (en) | 2018-04-25 | 2018-05-02 | Ebm-Papst St. Georgen Gmbh & Co. Kg | Return ring and electrical external rotor motor |
-
2019
- 2019-08-27 DE DE102019122969.3A patent/DE102019122969A1/en not_active Withdrawn
-
2020
- 2020-07-27 US US17/638,274 patent/US20220329120A1/en active Pending
- 2020-07-27 EP EP20754160.8A patent/EP4022741A1/en not_active Withdrawn
- 2020-07-27 CN CN202080060584.5A patent/CN114287102A/en not_active Withdrawn
- 2020-07-27 WO PCT/DE2020/100665 patent/WO2021037301A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
DE102019122969A1 (en) | 2021-03-04 |
WO2021037301A1 (en) | 2021-03-04 |
CN114287102A (en) | 2022-04-05 |
US20220329120A1 (en) | 2022-10-13 |
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