WO2020043229A1 - Procédé et dispositif de fabrication d'un rotor à rayons pour machine électrique - Google Patents

Procédé et dispositif de fabrication d'un rotor à rayons pour machine électrique Download PDF

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Publication number
WO2020043229A1
WO2020043229A1 PCT/DE2019/100670 DE2019100670W WO2020043229A1 WO 2020043229 A1 WO2020043229 A1 WO 2020043229A1 DE 2019100670 W DE2019100670 W DE 2019100670W WO 2020043229 A1 WO2020043229 A1 WO 2020043229A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnets
core
hollow cylindrical
cylindrical core
recesses
Prior art date
Application number
PCT/DE2019/100670
Other languages
German (de)
English (en)
Inventor
Thilo Stopfer
Original Assignee
Schaeffler Technologies AG & Co. KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG & Co. KG filed Critical Schaeffler Technologies AG & Co. KG
Priority to CN201980010117.9A priority Critical patent/CN111656655B/zh
Publication of WO2020043229A1 publication Critical patent/WO2020043229A1/fr

Links

Classifications

    • 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
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F13/00—Apparatus or processes for magnetising or demagnetising
    • H01F13/003—Methods and devices for magnetising 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
    • H02K1/276—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

Definitions

  • the invention relates to a method for producing a spoke rotor for an electrical machine, that is to say a rotor with magnets arranged in the form of a spoke.
  • Spoke rotors for electrical machines usually have a core and a plurality of permanent magnets which are arranged in the core in the manner of spokes.
  • the permanent magnets are typically polarized alternately in opposite directions in the tangential direction, so that a magnetic north pole always alternates with a magnetic south pole in the circumferential direction of the spoke rotor.
  • the core collects the magnetic flux tangentially between the permanent magnets and leads it radially outwards to the outer surface of the core, which is usually designed as a laminated core. In order to guide the maximum proportion of the magnetic flux into the air gap of the electrical machine, magnetic stray flux should be minimized via connecting bridges of the individual poles.
  • the permanent magnets are mounted on the core in a magnetized state. It is disadvantageous that the permanent magnets have to be moved relative to the core. Since the permanent magnets and the core attract each other, significant friction forces arise. In particular, if the core is formed from stacked, punched metal sheets, its surface is particularly rough.
  • DE 10 2011 115 454 A1 proposes a method for producing a spoke rotor in which an unmagnetized, hard magnetic material is connected to a segment of the core and is magnetized only after the connection. This can damage the corrosion protection to the Permanent magnets and stray flux can be prevented. However, the subsequent precise joining of the strongly magnetic and tolerant individual segments into a rotor is associated with great effort.
  • the task is to enable the manufacture of a spoke rotor with a long service life, minimal leakage flux and with the simplest possible production technology.
  • the object is achieved by a method for producing a spoke rotor for an electrical machine, in which a hollow cylindrical core is provided which is arranged around an axis of rotation and which has an inner circumferential surface on which several recesses for accommodating a permanent magnet are arranged, and wherein a plurality of permanent magnets are individually introduced into a recess in the hollow cylindrical core by movement along a radial direction arranged perpendicular to the axis of rotation.
  • the permanent magnets are moved in the radial direction and are thereby introduced into the recesses on the inner circumferential surface of the core.
  • the core and the permanent magnets can attract each other during insertion, so that friction occurs between the surface of the permanent magnets and the core.
  • the path of the permanent magnet during which friction occurs corresponds to the expansion of the permanent magnet in the radial direction and the direction of movement runs parallel to the usually layered individual sheets.
  • the hollow cylindrical core is preferably designed as a laminated core.
  • the laminated core can have a plurality of stacked laminations.
  • the sheets of the sheet stack can have an essentially ring-shaped cross section, ie the material of the sheet enables complete circulation in the circumferential direction of the hollow cylindrical core.
  • Such plates offer high mechanical strength, but enable the magnetic flux in the sheet material to be closed, which then does not can contribute to the generation of torque by the electrical machine.
  • the sheets can be segmented, the sheets preferably being designed as ring segments. Such sheets prevent an undesired circuit of the magnetic flux in the sheet, but the core can be mechanically warped quite easily.
  • the hollow cylindrical core is designed as a laminated core, which has both laminations with an essentially annular cross section and laminations designed as ring segments.
  • a mixture of different metal sheets of this type can provide a hollow cylindrical core with high mechanical strength and sufficient efficiency.
  • the permanent magnets are formed before the permanent magnets are introduced into the recesses, in particular cuboid hard magnetic blocks being provided to form the permanent magnets, which are magnetized.
  • the magnetization of the hard magnetic blocks in their unconnected state can be carried out with greater precision than would be the case in a state connected to the core.
  • the permanent magnets are formed one after the other, two successive permanent magnets each having opposite magnetizations.
  • the permanent magnets formed in this way can then be successively introduced into adjacent recesses in the core via an insertion device, so that an arrangement of the permanent magnets in the core is obtained in which the adjacent permanent magnets are magnetized in the tangential direction and the Alternate magnetizations of adjacent permanent magnets in the tangential direction.
  • a magnetic south pole alternates with a magnetic north pole in the circumferential direction of the core.
  • the permanent magnets have a fleas and a length and the ratio of the height to the length is less than or equal to 0.1, preferably less than or equal to 0.07. is particularly preferably less than or equal to 0.05.
  • the height of the permanent magnets is here the extent of the permanent magnets along their magnetization direction, that is to say the direction which is arranged in the tangential direction or circumferential direction in a state introduced into the core.
  • the permanent magnets are designed as cuboid magnets in which the direction of magnetization is perpendicular to the largest surfaces opposite. Or to put it another way: the poles lie on the largest areas.
  • the length of the permanent magnet is understood to mean the expansion of the permanent magnets, which, when introduced into the core, extends in the axial direction of the hollow cylindrical core.
  • the permanent magnets are guided by a guide in the radial direction when they are introduced into the recess and are pressed into the recess by a stamp.
  • the guide can mechanically stabilize the permanent magnets and counteract undesired breakdown due to magnetic attraction forces.
  • the respective permanent magnet can be pressed into the respective recess by the stamp.
  • the guide is preferably aligned with the recess, for example in such a way that a guide surface of the guide is aligned with one or more inner walls of the recess.
  • the guide can have, for example, two press jaws, which hold the permanent magnet in alignment with the respective recess, while the plunger presses the permanent magnet into the recess.
  • a pressing pressure which the pressing jaws bring about on the permanent magnet is particularly preferably adjustable.
  • the permanent magnet to be introduced into the recesses by means of an insertion device and, after the introduction of a first permanent magnet into a first recess, the core is rotated relative to the insertion device or the insertion device is rotated relative to the core before an insertion second permanent magnet is introduced into a second recess. Due to the relative rotation of the insertion device and core, several recesses in the core can be efficiently equipped with permanent magnets one after the other.
  • the core is preferably held by a holding device, which can be relatively rotatable with respect to the insertion device.
  • An embodiment is preferred in which permanent magnets are first introduced into all the recesses in the hollow cylindrical core and then the magnetic field is scanned directly on the inner lateral surface by means of a sensor, in particular by means of a Hall sensor, in order to detect defective permanent magnets or pole positions detect.
  • the sensor can be inserted into the hollow cylindrical core for scanning.
  • the core can be rotated relative to the sensor or the sensor can be rotated relative to the core.
  • a rotor carrier is connected to the hollow cylindrical core in such a way that an outer lateral surface of the rotor carrier comes into contact with the inner lateral surface of the hollow cylindrical core.
  • the core is preferably connected to the rotor carrier after the permanent magnets have been introduced into the recesses in the core.
  • the recesses on the inner circumferential surface of the core can be closed by the connection to the rotor carrier, so that the permanent magnets accommodated in the recesses are secured against undesired slipping out of the recesses.
  • an adhesive is applied to the outer circumferential surface of the rotor carrier, which glue enters the recesses in the hollow cylindrical core when the rotor carrier is connected to the hollow cylindrical core - penetrates and fixes the permanent magnets.
  • the adhesive can reduce the risk of the permanent magnets slipping within the recesses.
  • a device for producing a spoke rotor for an electrical machine comprising a holding device for holding a hollow cylindrical core which is arranged about an axis of rotation and has an inner lateral surface on which a plurality of recesses are provided Recording each a permanent magnet are arranged, and an insertion device for inserting the permanent magnets by means of a movement along a radial direction perpendicular to the axis of rotation into the recesses in the hollow cylindrical core.
  • the device can achieve the same advantages as have already been described in connection with the method according to the invention.
  • the holding device preferably has a plurality of segment shells, in particular two half shells.
  • the segment shells can have a contact surface which is adapted to the outer lateral surface of the hollow cylindrical core and which bears against the core when it is held.
  • the holding device is preferably made of a non-ferromagnetic material, for example a plastic, in particular hard plastic, so that there is no fear of a magnetic interaction with the core or the permanent magnets.
  • the device has a magnetizing device for forming the permanent magnets, which is set up to magnetize, in particular, cuboid hard magnetic blocks.
  • the magnetizing device can have a magnetic feed via which the hard magnetic blocks of a portioning device can be fed to the magnetizer device.
  • the blocks can be brought individually into a magnetizing tool of the magnetizing device via the portioning device.
  • the magnetizing tool preferably comprises an electromagnet, the magnetic field of which is adjustable.
  • the insertion device can convey the permanent magnets from the magnetizing device into the respective recess in the core.
  • FIG. 1 shows an embodiment of a spoke rotor in a partially sectioned perspective view.
  • FIG. 2 shows a schematic sectional illustration through the core of the spoke rotor according to FIG. 1 along a first sectional plane;
  • FIG. 3 shows a schematic sectional view through the core of the spoke rotor according to FIG. 1 along a second sectional plane;
  • FIG. 4 shows a device for locating a spoke rotor in a schematic illustration
  • FIG. 5 shows a first exemplary embodiment of a folding device for folding a core when a spoke rotor is set in perspective in a sectional view
  • FIG. 6 shows a second exemplary embodiment of a folding device for folding a core when fixing a spoke rotor in a perspective sectional view
  • FIG. 7 shows an exemplary embodiment of a magnetizing device in a schematic representation
  • FIG. 8 shows an embodiment of an insertion device in a sectional view
  • FIG. 9 shows the insertion device according to FIG. 8 in a perspective illustration
  • FIG. 10 shows a variant of the introduction device according to FIG. 8 in a sectional view
  • FIG. 13 is a perspective sectional view of a combination device for combining the core with a rotor carrier; 1 schematically shows an embodiment of a spoke rotor 1 which was produced by means of the method according to the invention.
  • the spoke rotor 1 can be used in an electrical machine, for example a generator or an electric motor, as a permanently excited rotor.
  • the spoke rotor 1 comprises a hollow cylindrical core 2, which is arranged around an axis of rotation A.
  • the core is designed as a laminated core.
  • the core 3 has an essentially annular cross section.
  • a plurality of recesses 6 are provided on the inner lateral surface 4 of the core, in each of which a permanent magnet 3 is arranged.
  • the permanent magnets 3 are cuboidal and have a length L which essentially corresponds to the height of the hollow cylindrical core.
  • the permanent magnets also have a height H.
  • the ratio of the height H to the length L is less than or equal to 0.1, preferably less than or equal to 0.07, particularly preferably less than or equal to 0.05.
  • the height H corresponds to the expansion of the permanent magnets 3 in the direction in which the permanent magnets are magnetized, i.e. the direction of their magnetization axis.
  • the permanent magnets 3 are arranged in the core 2 such that their magnetization is oriented in the tangential direction.
  • the permanent magnets 3 are arranged such that they are alternately polarized in opposite directions, so that a magnetic north pole always alternates with a magnetic south pole in the circumferential direction of the spoke rotor.
  • the core 2 collects the magnetic flux tangentially between the permanent magnets 3 and leads it radially outward to the outer lateral surface 5 of the core 3.
  • the rotor carrier 7 comprises a stop 8 with an annular cross section, against which the core 2 rests.
  • the core 2 and the rotor carrier 7 are connected to one another, in particular by means of an adhesive connection.
  • FIG. 2 shows a schematic sectional illustration through the core 2 of FIG. 1 along a first cutting plane.
  • the core 2 has sheets formed as ring segments 9.
  • An air gap 10 is arranged between the individual ring segments 9, which on the one hand forms a recess for receiving a permanent magnet 3 and on the other hand prevents undesired closure of the magnetic flux within the core 2 in the sectional plane shown.
  • FIG. 3 shows a schematic sectional illustration through the core 2 along a second sectional plane.
  • annular sheets 12 are provided which have an essentially annular cross section with recesses 6.
  • the recesses 6 are each delimited by a web 11, which enables the magnetic flux within the material of the sheet in the circumferential direction of the hollow cylindrical core 2 to circulate completely.
  • the individual sheets of the core 2 are electrically insulated from one another in the axial direction. Holes 13 are also provided in the metal sheets of the core 2 and are not filled. These serve to reduce weight and can be used in the course of production to hold tools.
  • the core is manufactured in a hybrid design in order to combine the advantages of a segmented structure (FIG. 2) with those of a full cut (FIG. 3). Full cuts are present in the core at regular intervals and the magnetic short-circuit path is accepted, cf. Fig. 1.
  • a method can be used to manufacture the spoke rotor 1, which will be explained in more detail below.
  • 4 shows the schematic sequence of such a method for producing a spoke rotor 1 for an electrical machine.
  • a hollow cylindrical core 2 is provided which is arranged around an axis of rotation A and has an inner circumferential surface 4, on which a plurality of recesses 6 are arranged for receiving a permanent magnet 3 each.
  • the permanent magnets 3 are each introduced individually into a recess 6 in the hollow cylindrical core 2 by movement along a radial direction R arranged perpendicular to the axis of rotation A, cf. 1.
  • the inner lateral surface 4 of the core 2 can be scanned by means of a sensor, in particular by means of a Hall sensor, in order to detect defective permanent magnets 3 or polarities.
  • a connection step 104 the rotor carrier 7 is then connected to the hollow cylindrical core 2 such that an outer lateral surface of the rotor carrier 7 comes into contact with the inner lateral surface 4 of the hollow cylindrical core 3.
  • a corresponding device for producing such a spoke rotor 1 for an electrical machine has a holding device 20 for holding the hollow cylindrical core 2 arranged around a rotation axis.
  • FIG. 5 shows an exemplary embodiment of such a holding device 20 for holding the hollow cylindrical core 2 in a perspective sectional view.
  • the holding device 20 adjusts the ring, stabilizes it and is preferably rotatable. Furthermore, the core 2 can remain in the holding device 20 while it is being conveyed to different stations of the device for producing the spoke rotor 1.
  • the holding device 20 is preferably formed from a non-ferromagnetic material, for example a hard plastic.
  • This holding device 20 comprises two segment shells 21 designed as half shells, of which only one is shown in FIG. 5.
  • segment shells receive the core 2 at its outer diameter with a precise shape and hold it radially.
  • a stop 22 On the underside of the segment switches there is a stop 22 with a contact surface on which the core 2 comes to rest axially.
  • the segment shells 21 In order to receive the core 2, the segment shells 21 are moved towards one another so that the core 2 is firmly enclosed.
  • the core can be subjected to a force F1 in the axial direction via press blocks 23. In this way it is possible to compress the individual sheets of the core in the axial direction, so that the core 2 is held stable and is clamped on from all sides except from the inner lateral surface 4. The recesses 6 remain accessible, a height tolerance of the laminated core is compensated.
  • the permanent magnets 3 are formed before being introduced into the recesses 6 by providing cuboid, hard magnetic blocks 3 'which are magnetized by means of a magnetizing device 30 shown in FIG. 7.
  • the magnetizing device 30 has a magnetic feed 31, which is designed in the manner of a feed hose.
  • the portioning device 32 enables the blocks 3 'to be introduced individually into a magnetizing tool 33 of the magnetizing device 30.
  • the permanent magnets 3 are formed one after the other, two successive permanent magnets 3 each having opposite magnetizations.
  • the magnetized permanent magnet 3 is dropped out of the magnetizing tool 33 and picked up and clamped by two non-magnetic holding jaws 41 of an insertion device 40.
  • the insertion device 40 is designed to introduce the permanent magnets 3 into the recesses 6 in the hollow cylindrical core 2 by means of a movement along a radial direction R arranged perpendicular to the axis of rotation A.
  • the holding jaws 41 are part of a guide for the insertion device 40, which mechanically stabilizes the permanent magnets 3 when they are introduced into the recesses 6 and counteracts undesired breakup due to magnetic attraction forces, cf. Fig. 8-12.
  • the holding jaws 41 are slightly relaxed and the permanent magnet 3 is guided with a punch 42 through the holding jaws 41 into the recess 6, cf. 11 and 12.
  • the punch 41 can be movable via a rotatably mounted lever 43, on which a force F2 is exerted.
  • the holding device 20 with the core 2 is brought to a further station of the device, in which the connection to the rotor carrier 7 is established.
  • a probe with a Hall sensor can be guided into the inner diameter and the holding device 20 with the loaded core 2 can be rotated.
  • the signal is compared with a target signal in order to identify faulty polarities or incorrectly magnetized permanent magnets 3 at an early stage and, if necessary, to exchange them.
  • FIG. 13 shows a mandrel 50 on which a rotor carrier 7 is received.
  • the rotor carrier 7 is connected to the hollow cylindrical core 2 in such a way that an outer lateral surface of the rotor carrier 7 comes into contact with the inner lateral surface 4 of the hollow cylindrical core 2.
  • the rotor carrier 7 received on the mandrel 50 is provided with adhesive 14 in a peripheral area.
  • the holding device 20 with the loaded core 2 comes to a stop precisely under the rotor carrier 7.
  • the rotor carrier is inserted or pressed into the interior of the core 2 from above.
  • the adhesive 14 spreads and is displaced into all gaps. It also adheres to the permanent magnet 3 and secures it against further displacement.
  • the rotor carrier 7 thus significantly ensures the later roundness of the structure.
  • the mandrel 50 pulls the finished spoke rotor 1 upwards and leads it to an output. Depending on the curing time of the adhesive, a balancing process can still take place on this mandrel 50.
  • the device described above for producing a spoke rotor 1 for an electrical machine comprises a holding device 20 for holding a hollow cylindrical core 2 which is arranged about an axis of rotation A and has an inner lateral surface 4 on which a plurality of recesses 6 each hold one Permanent magnets 3 are arranged, and an insertion device 40 for inserting the permanent magnets 3 by means of a movement along a radial direction R arranged perpendicular to the axis of rotation A into the recesses in the hollow cylindrical core 2.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un rotor à rayons destiné à une machine électrique. Un noyau cylindrique creux est prévu qui est disposé autour d'un axe de rotation et qui comporte une surface d'enveloppe intérieure au niveau de laquelle est ménagée une pluralité d'évidements destinés à recevoir chacun un aimant permanent et une pluralité d'aimants permanents sont introduits chacun dans un évidement du noyau cylindrique creux par déplacement dans une direction radiale perpendiculaire à l'axe de rotation. L'invention concerne en outre un dispositif de fabrication d'un rotor à rayons destiné à une machine électrique. Ledit dispositif de fabrication comprend un moyen de retenue destiné à maintenir un noyau cylindrique creux qui est disposé autour d'un axe de rotation et qui comporte une surface d'enveloppe intérieure au niveau de laquelle sont ménagés une pluralité d'évidements destinés à recevoir chacun un aimant permanent et un moyen d'insertion destiné à insérer les aimants permanents dans les évidements du noyau cylindrique creux par déplacement dans une direction radiale perpendiculaire à l'axe de rotation.
PCT/DE2019/100670 2018-08-29 2019-07-22 Procédé et dispositif de fabrication d'un rotor à rayons pour machine électrique WO2020043229A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201980010117.9A CN111656655B (zh) 2018-08-29 2019-07-22 用于制造电机的轮辐转子的方法和设备

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102018121062.0A DE102018121062A1 (de) 2018-08-29 2018-08-29 Verfahren und Vorrichtung zum Herstellen eines Speichenrotors für eine elektrische Maschine
DE102018121062.0 2018-08-29

Publications (1)

Publication Number Publication Date
WO2020043229A1 true WO2020043229A1 (fr) 2020-03-05

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Application Number Title Priority Date Filing Date
PCT/DE2019/100670 WO2020043229A1 (fr) 2018-08-29 2019-07-22 Procédé et dispositif de fabrication d'un rotor à rayons pour machine électrique

Country Status (3)

Country Link
CN (1) CN111656655B (fr)
DE (1) DE102018121062A1 (fr)
WO (1) WO2020043229A1 (fr)

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DE102021131536A1 (de) 2021-12-01 2023-06-01 Schaeffler Technologies AG & Co. KG Rotor, insbesondere für eine elektrische Rotationsmaschine, Verfahren zur Herstellung des Rotors, und elektrische Rotationsmaschine mit dem Rotor

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US20080024018A1 (en) * 2006-07-13 2008-01-31 Moteurs Leroy-Somer Rotor for an electric rotary machine, and a method of manufacture
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US6304080B1 (en) * 1999-10-19 2001-10-16 Eastman Kodak Company System for verifying the location of a plurality of physical features relative to magnetic poles arranged on a complex magnetic element
US6720792B2 (en) * 2001-09-17 2004-04-13 Ford Global Technologies, Llc Detection of demagnetization in a motor in an electric or partially electric motor vehicle
EP1806826A2 (fr) * 2006-01-10 2007-07-11 General Electric Company Système et procédé d'assemblage d'une machine électromagnétique
US20080024018A1 (en) * 2006-07-13 2008-01-31 Moteurs Leroy-Somer Rotor for an electric rotary machine, and a method of manufacture
DE102011115454A1 (de) 2010-06-29 2012-01-19 Schaeffler Technologies Gmbh & Co. Kg Magnetische Baugruppe, insbesondere für eine elektrische Maschine und Verfahren zur Herstellung einer Baugruppe
DE102012207243A1 (de) * 2012-05-02 2013-11-07 Robert Bosch Gmbh Positionierung eines Dauermagneten in einem Rotor oder Stator
US20160254711A1 (en) * 2015-02-27 2016-09-01 Nidec Corporation Motor

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021131536A1 (de) 2021-12-01 2023-06-01 Schaeffler Technologies AG & Co. KG Rotor, insbesondere für eine elektrische Rotationsmaschine, Verfahren zur Herstellung des Rotors, und elektrische Rotationsmaschine mit dem Rotor

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Publication number Publication date
CN111656655A (zh) 2020-09-11
DE102018121062A1 (de) 2020-03-05
CN111656655B (zh) 2023-04-18

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