EP2923432A1 - Rotor of an electric motor and method for producing the rotor - Google Patents

Rotor of an electric motor and method for producing the rotor

Info

Publication number
EP2923432A1
EP2923432A1 EP13792013.8A EP13792013A EP2923432A1 EP 2923432 A1 EP2923432 A1 EP 2923432A1 EP 13792013 A EP13792013 A EP 13792013A EP 2923432 A1 EP2923432 A1 EP 2923432A1
Authority
EP
European Patent Office
Prior art keywords
magnets
plastic
rotor
shaft
webs
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Withdrawn
Application number
EP13792013.8A
Other languages
German (de)
French (fr)
Inventor
Kurt Siebald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Vitesco Technologies GmbH
Original Assignee
Continental Automotive GmbH
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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP2923432A1 publication Critical patent/EP2923432A1/en
Withdrawn legal-status Critical Current

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
    • H02K1/28—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
    • H02K1/22—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
    • H02K15/00—Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/10—Applying solid insulation to windings, stators or rotors
    • 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
    • H02K15/12—Impregnating, heating or drying of windings, stators, rotors or machines

Definitions

  • the invention relates to a rotor of an electric motor with an anchor plate package, a shaft, magnets arranged on the circumference of the armature ⁇ sheet package and a Kunststoffumsprit- tion.
  • the invention further relates to a method for producing the rotor.
  • Such rotors of electric motors are used for example in fuel pumps or actuators and are therefore state of the art.
  • the magnetic flux must be as high as possible.
  • the magnets are fixed in their position by the plastic extrusion.
  • the laminated core with the shaft and the magnets is placed in an injection mold. This means that the magnets must be brought into the correct final position before the injection molding in the injection mold.
  • adhesive For this it is known to fix the magnets on the rotor with adhesive. This fixing by means of adhesive means an additional step, which adversely affects the productivity of ⁇ .
  • the first object is achieved with a rotor in which the armature lamination packet has at least one associated channel at its circumference to each magnet, wherein the channels run parallel to the shaft and that the armature lamination packet extends radially on the circumference.
  • directed webs has, wherein the webs extend parallel to the shaft and between two webs is arranged in each case a magnet, and that the plastic encapsulation covers the laminated core and the magnets so far that only the radial outer side of the magnet is free of plastic.
  • the arrangement of the channels and the webs has the consequence that thereby the magnets can be positioned defined both in the radial direction and in your distribution at the periphery. With the webs, the distribution of the magnets on the circumference can be specified exactly.
  • the open to the magnets channels cause the injected plastic through these openings due to its injection pressure against the magnets and these against the
  • Injection mold presses Injection mold presses. In this way, the magnets are moved in the radial direction in their final position. This has the advantage that the end position of the magnets is determined solely by the injection mold. Manufacturing tolerances of the anchor plate package and positional tolerances in the injection mold are compensated. As a result, the anchor plate package can be manufactured with larger tolerances and thus more cost-effectively. In addition, a fixing of the magnets can be omitted.
  • According to further advantageous embodiments may have a round, triangular or polygonal cross-sectional area ⁇ the channels.
  • a particularly intimate connection of the plastic encapsulation with the anchor lamination stack is achieved when the cross-sectional area of the channels creates an undercut with respect to the opening located toward the magnets.
  • a form fit between the anchor plate package and the plastic extrusion is additionally generated.
  • the holding of the magnets on the rotor is achieved by the adhesive bond between plastic and magnet.
  • the holding of the magnets on the rotor can be increased according to an advantageous embodiment, when the magnets are additionally connected with a positive connection with the plastic extrusion by at least the radially outer edges of the magnets have chamfers and the chamfers are surrounded by plastic.
  • a reliable distribution of the magnets on the periphery without substantially increasing the weight of the armature plate package is achieved in another embodiment in that the webs have a lower height than the magnets. In this way, the distribution is ensured without significantly increasing the diameter of the anchor plate. This in turn means that the costs for these stamped parts hardly increase.
  • the second object is achieved in that the plastic end face in the channels in the anchor plate package penetrates ⁇ and the magnets in the radial direction against the
  • the advantage is that reaching the final position of the magnets in the rotor is no longer achieved exclusively by the formation of the rotor and / or the injection mold.
  • the process-related pressure with which the plastic is injected into the injection mold is used to move the magnets into their end position, which is determined by the injection mold.
  • the webs in the anchor plate package serve to guide when the magnets move radially outward. The positioning of the magnets thus takes place only during the actual injection molding and not during insertion into the injection mold. Only the interaction of Workpiece, tool and process leads to the final posi ⁇ tioning.
  • Fig. 3 shows a channel of the anchor sheet package in an enlarged view.
  • Figure 1 shows a rotor of an electric motor which is used in a fuel pump or an actuator, whose shaft is not shown.
  • an anchor plate package 1 which consists of a plurality of punched plates 2, which are connected to the anchor plate package 1.
  • Magnets 3 are arranged around the lateral surface of the laminated core 1.
  • Anchor plate package 1 and magnets 3 are encapsulated with plastic 4 and together form the rotor as a homogeneous body.
  • the magnets can be both hard ferrite magnets or Neo ⁇ dym magnets.
  • FIG. 2a shows the laminated core 1, consisting of the
  • the magnets 3 have at their radially outer edges 5 and the radially inner edges 6 of the front sides 7 of chamfers 10 having a positive bond between the magnet 3 and plastic 4 ge ⁇ schrangn during the encapsulation with the plastic.
  • the plastic 4 may be polyoxymethylene or polyamide.
  • the laminated core 1 has on the lateral surface radially outwardly projecting webs 8 which fix the magnets 3 in the circumferential direction on the laminated core 1. Between two Webs 8 each have a channel 9 is arranged. Both the channels 9 and the webs 8 are aligned parallel to the shaft of the rotor.
  • FIG. 2b shows the laminated core 1 and the magnets 3, as arranged in the injection mold.
  • Figure 3 shows a channel 9 in an enlarged view.
  • the channel 9 has over its longitudinal extent a directed towards the magnet 3 opening 10.
  • the width of the opening 10 is smaller than the diameter of the cross-sectional area of the channel 9.
  • the plastic 4 is injected into the channel 9.
  • the magnet 3 is pressed radially outward against the wall of the injection mold in its final position. This movement is significantly smaller than the height h of the webs 8.
  • the magnet 3 With the cooling and curing of the plastic melt 4, the magnet 3 is fixed in its end position.

Abstract

The invention relates to a rotor of an electric motor, comprising a laminated armature core (1), a shaft, magnets (3) arranged on the circumference of the laminated armature core (1), and a plastic overmold (4). The laminated armature core (1) has at least one associated channel (9) on the circumference of the laminated armature core for each magnet (3), wherein the channels (9) extend parallel to the shaft, and the laminated armature core (1) has radially oriented webs (8) on the circumference, wherein the webs (8) extend parallel to the shaft and a magnet (9) is arranged between each pair of webs (8), and the plastic overmold (4) encloses the laminated armature core (1) and the magnets (3) to such an extent that only the radial outer face of the magnets (3) is free of plastic (4).

Description

Beschreibung description
Rotor eines Elektromotors und Verfahren zur Herstellung des Rotors Rotor of an electric motor and method of manufacturing the rotor
Gegenstand der Erfindung ist eine Rotor eines Elektromotors mit einem Ankerblechpaket, einer Welle, am Umfang des Anker¬ blechpakets angeordnete Magnete und einer Kunststoffumsprit- zung. Die Erfindung betrifft weiter ein Verfahren zur Herstellung des Rotors. The invention relates to a rotor of an electric motor with an anchor plate package, a shaft, magnets arranged on the circumference of the armature ¬ sheet package and a Kunststoffumsprit- tion. The invention further relates to a method for producing the rotor.
Derartige Rotoren von Elektromotoren werden beispielsweise in Kraftstoffpumpen oder Stellgliedern eingesetzt und sind somit Stand der Technik. Um einen hohen Wirkungsgrad der Elektromotoren zu erreichen, muss der magnetische Fluss möglichst hoch sein. Das setzt voraus, dass die Magnete exakt an ihrer vorgegebenen Position am Rotor angeordnet sind um möglichst optimal mit dem Stator des Elektromotors zusammenzuwirken. Die Magnete werden in ihrer Position durch die Kunststoffumspritzung festgelegt. Für die Kunststoffumspritzung wird das Ankerblechpaket mit der Welle und den Magneten in eine Spritzgießform eingelegt. Das bedeutet, dass die Magnete bereits vor dem Umspritzen in der Spritzgießform in die richtige Endposition gebracht werden müssen. Dazu ist es bekannt, die Magnete am Rotor mit Klebstoff zu fixieren. Dieses Fixieren mittels Klebstoff bedeutet einen zusätzlichen Arbeitsschritt , was sich nachteilig auf die Produktivität aus¬ wirkt . Such rotors of electric motors are used for example in fuel pumps or actuators and are therefore state of the art. In order to achieve a high efficiency of the electric motors, the magnetic flux must be as high as possible. This presupposes that the magnets are arranged exactly at their predetermined position on the rotor in order to interact as optimally as possible with the stator of the electric motor. The magnets are fixed in their position by the plastic extrusion. For the plastic encapsulation, the laminated core with the shaft and the magnets is placed in an injection mold. This means that the magnets must be brought into the correct final position before the injection molding in the injection mold. For this it is known to fix the magnets on the rotor with adhesive. This fixing by means of adhesive means an additional step, which adversely affects the productivity of ¬ .
Aufgabe der vorliegenden Erfindung ist es daher, einen Rotor eines Elektromotors und Verfahren zur Herstellung des solchen Rotors zu schaffen, der leichter herzustellen ist. Insbesondere soll die Verwendung von Klebstoff vermieden werden. It is therefore an object of the present invention to provide a rotor of an electric motor and method of manufacturing such a rotor, which is easier to manufacture. In particular, the use of adhesive should be avoided.
Gelöst wird die erste Aufgabe mit einem Rotor, bei dem das Ankerblechpaket an seinem Umfang zu jedem Magnet mindestens ein zugeordneten Kanal aufweist, wobei die Kanäle parallel zur Welle verlaufen und dass das Ankerblechpaket am Umfang radial aus- gerichtete Stege besitzt, wobei sich die Stege parallel zur Welle erstrecken und zwischen zwei Stegen je ein Magnet angeordnet ist, und dass die Kunststoffumspritzung das Ankerblechpaket und die Magnete soweit umhüllt, dass nur die radiale Außenseite der Magneten frei von Kunststoff ist. The first object is achieved with a rotor in which the armature lamination packet has at least one associated channel at its circumference to each magnet, wherein the channels run parallel to the shaft and that the armature lamination packet extends radially on the circumference. directed webs has, wherein the webs extend parallel to the shaft and between two webs is arranged in each case a magnet, and that the plastic encapsulation covers the laminated core and the magnets so far that only the radial outer side of the magnet is free of plastic.
Die Anordnung der Kanäle und der Stege hat zur Folge, dass dadurch die Magnete sowohl in radialer Richtung als auch in Ihrer Verteilung am Umfang definiert positioniert werden können. Mit den Stegen lässt sich die Verteilung der Magnete am Umfang exakt vorgeben. Die zu den Magneten offenen Kanäle bewirken, dass der eingespritzte Kunststoff über diese Öffnungen aufgrund seines Einspritzdruckes gegen die Magnete und diese gegen die The arrangement of the channels and the webs has the consequence that thereby the magnets can be positioned defined both in the radial direction and in your distribution at the periphery. With the webs, the distribution of the magnets on the circumference can be specified exactly. The open to the magnets channels cause the injected plastic through these openings due to its injection pressure against the magnets and these against the
Spritzgießform drückt. Auf diese Weise werden die Magnete in radialer Richtung in ihre endgültige Lage bewegt. Das hat den Vorteil, dass die Endposition der Magnete allein von der Spritzgießform bestimmt wird. Fertigungstoleranzen des Ankerblechpakets und Lagetoleranzen in der Spritzgießform werden so ausgeglichen. Dadurch kann das Ankerblechpaket mit größeren Toleranzen und damit kostengünstiger gefertigt werden. Hinzu kommt, dass ein Fixieren der Magnete entfallen kann. Injection mold presses. In this way, the magnets are moved in the radial direction in their final position. This has the advantage that the end position of the magnets is determined solely by the injection mold. Manufacturing tolerances of the anchor plate package and positional tolerances in the injection mold are compensated. As a result, the anchor plate package can be manufactured with larger tolerances and thus more cost-effectively. In addition, a fixing of the magnets can be omitted.
In Abhängigkeit von der Größe der Magnete kann es sinnvoll sein, bei größeren Magneten je Magnet mindestens 2 Kanäle im An- kerblechpaket vorzusehen. Depending on the size of the magnets, it may make sense to provide at least 2 channels per magnet in the anchor plate package for larger magnets.
Gemäß weiteren vorteilhaften Ausgestaltungen können die Kanäle eine runde, dreieckige oder polygone Querschnittsfläche auf¬ weisen . According to further advantageous embodiments may have a round, triangular or polygonal cross-sectional area ¬ the channels.
Eine besonders innige Verbindung der Kunststoffumspritzung mit dem Ankerblechpaket wird erreicht, wenn die Querschnittsfläche der Kanäle einen Hinterschnitt gegenüber der zu den Magneten gelegenen Öffnung erzeugt. Dadurch wird zusätzlich ein Form- schluss zwischen Ankerblechpaket und Kunststoffumspritzung erzeugt . Das Halten der Magnete am Rotor wird durch den Haftverbund zwischen Kunststoff und Magnet erreicht. Das Halten der Magnete am Rotor kann gemäß einer vorteilhaften Ausgestaltung dadurch erhöht werden, wenn die Magnete zusätzlich mit einem Formschluss mit der Kunststoffumspritzung verbunden, indem zumindest die radial außenliegenden Kanten der Magnete Fasen besitzen und die Fasen vom Kunststoff umgeben sind. Der Vorteil besteht darin, dass der Formschluss allein durch den Kunststoff und die Magnete erzeugt wird und nicht zwischen den Magneten und dem Anker- blechpaket, was eine Erhöhung des Aufwandes für das Anker¬ blechpaket bedeutet hätte. A particularly intimate connection of the plastic encapsulation with the anchor lamination stack is achieved when the cross-sectional area of the channels creates an undercut with respect to the opening located toward the magnets. As a result, a form fit between the anchor plate package and the plastic extrusion is additionally generated. The holding of the magnets on the rotor is achieved by the adhesive bond between plastic and magnet. The holding of the magnets on the rotor can be increased according to an advantageous embodiment, when the magnets are additionally connected with a positive connection with the plastic extrusion by at least the radially outer edges of the magnets have chamfers and the chamfers are surrounded by plastic. The advantage is that the form-fit is generated solely by the plastic and the magnets and not between the magnet and the anchor sheet package, which would have meant an increase in the cost of the armature ¬ sheet package.
Eine zuverlässige Verteilung der Magnete am Umfang ohne das Gewicht des Ankerblechpaketes wesentlich zu erhöhen wird in einer anderen Ausgestaltung dadurch erreicht, dass die Stege eine geringere Höhe als die Magnete aufweisen. Auf diese Weise wird die Verteilung sichergestellt, ohne den Durchmesser der Ankerbleche wesentlich zu vergrößern. Das wiederum hat zur Folge, dass sich die Kosten für diese Stanzteile kaum erhöhen. A reliable distribution of the magnets on the periphery without substantially increasing the weight of the armature plate package is achieved in another embodiment in that the webs have a lower height than the magnets. In this way, the distribution is ensured without significantly increasing the diameter of the anchor plate. This in turn means that the costs for these stamped parts hardly increase.
Die zweite Aufgabe wird erfindungsgemäß dadurch gelöst, dass der Kunststoff stirnseitig in die Kanäle im Ankerblechpaket ein¬ dringt und die Magnete in radialer Richtung gegen die The second object is achieved in that the plastic end face in the channels in the anchor plate package penetrates ¬ and the magnets in the radial direction against the
Spritzgießform drückt. Injection mold presses.
Der Vorteil besteht darin, dass das Erreichen der endgültigen Lage der Magneten im Rotor nicht mehr ausschließlich durch die Ausbildung des Rotors und/oder der Spritzgießform erreicht wird. Nach diesem Verfahren wird der prozessbedingte Druck, mit dem der Kunststoff in die Spritzgießform eingespritzt wird, genutzt, um die Magnete in ihre Endlage, welche von der Spritzgießform bestimmt wird, zu bewegen. Die Stege im Ankerblechpaket dienen dabei zur Führung, wenn sich die Magnete radial nach außen bewegen. Die Positionierung der Magnete erfolgt somit erst während des eigentlichen Spritzgießens und nicht schon während des Einlegens in die Spritzgießform. Erst das Zusammenwirken von Werkstück, Werkzeug und Prozess führt zur endgültigen Posi¬ tionierung . The advantage is that reaching the final position of the magnets in the rotor is no longer achieved exclusively by the formation of the rotor and / or the injection mold. According to this method, the process-related pressure with which the plastic is injected into the injection mold is used to move the magnets into their end position, which is determined by the injection mold. The webs in the anchor plate package serve to guide when the magnets move radially outward. The positioning of the magnets thus takes place only during the actual injection molding and not during insertion into the injection mold. Only the interaction of Workpiece, tool and process leads to the final posi ¬ tioning.
An einem Ausführungsbeispiel wird die Erfindung näher be¬ schrieben. Es zeigen in: In one embodiment, the invention will be described in more detail ¬ . Show in:
Fig. 1 einen erfindungsgemäßen Rotor, 1 shows a rotor according to the invention,
Fig. 2a, b Ankerblechpaket und Magnete in Explosionsdar- Stellung, Fig. 2a, b sheet-arm assembly and magnets in exploded view,
Fig.2c Ankerblechpaket und Magnete in gefügtem Zustand und Fig.2c anchor sheet package and magnets in joined state and
Fig. 3 einen Kanal des Ankerblechpaket in vergrößerter Darstellung.  Fig. 3 shows a channel of the anchor sheet package in an enlarged view.
Figur 1 zeigt einen Rotor eines Elektromotors, der in einer Kraftstoffpumpe oder einem Stellglied zum Einsatz kommt, dessen Welle nicht dargestellt ist. Auf der Welle sitzt ein Anker- blechpaket 1, welches aus einer Vielzahl gestanzter Bleche 2 besteht, die zu dem Ankerblechpaket 1 verbunden sind. Um die Mantelfläche des Ankerblechpakets 1 verteilt sind Magnete 3 angeordnet. Ankerblechpaket 1 und Magnete 3 sind mit Kunststoff 4 umspritzt und bilden zusammen als homogener Körper den Rotor. Die Magnete können sowohl Hart-Ferrit-Magnete oder Neo¬ dym-Magnete sein. Figure 1 shows a rotor of an electric motor which is used in a fuel pump or an actuator, whose shaft is not shown. On the shaft sits an anchor plate package 1, which consists of a plurality of punched plates 2, which are connected to the anchor plate package 1. Magnets 3 are arranged around the lateral surface of the laminated core 1. Anchor plate package 1 and magnets 3 are encapsulated with plastic 4 and together form the rotor as a homogeneous body. The magnets can be both hard ferrite magnets or Neo ¬ dym magnets.
Figur 2a zeigt das Ankerblechpaket 1, bestehend aus den FIG. 2a shows the laminated core 1, consisting of the
Stanzblechen 2 und die Magnete 3 in einer Explosionsdarstellung. Die Magnete 3 besitzen an ihren radial außenliegenden Kanten 5 und den radial innenliegenden Kanten 6 der Stirnseiten 7 Fasen 10, die beim Umspritzen mit dem Kunststoff 4 einen formschlüssigen Verbund zwischen Magnet 3 und Kunststoff 4 ge¬ währleisten. Der Kunststoff 4 kann Polyoxymethylen oder Polyamid sein. Das Ankerblechpaket 1 besitzt an der Mantelfläche nach radial außen abstehende Stege 8, welche die Magnete 3 in Um- fangsrichtung auf dem Ankerblechpaket 1 festlegen. Zwischen zwei Stegen 8 ist jeweils ein Kanal 9 angeordnet. Sowohl die Kanäle 9 als auch die Stege 8 sind parallel zur Welle des Rotors ausgerichtet . Figur 2b zeigt das Ankerblechpaket 1 und die Magnete 3, wie sie in der Spritzgießform angeordnet sind. Punching plates 2 and the magnets 3 in an exploded view. The magnets 3 have at their radially outer edges 5 and the radially inner edges 6 of the front sides 7 of chamfers 10 having a positive bond between the magnet 3 and plastic 4 ge ¬ währleisten during the encapsulation with the plastic. 4 The plastic 4 may be polyoxymethylene or polyamide. The laminated core 1 has on the lateral surface radially outwardly projecting webs 8 which fix the magnets 3 in the circumferential direction on the laminated core 1. Between two Webs 8 each have a channel 9 is arranged. Both the channels 9 and the webs 8 are aligned parallel to the shaft of the rotor. FIG. 2b shows the laminated core 1 and the magnets 3, as arranged in the injection mold.
Figur 3 zeigt einen Kanal 9 in vergrößerter Darstellung. Der Kanal 9 besitzt über seine Längserstreckung eine in Richtung des Magneten 3 gerichtete Öffnung 10. Die Breite der Öffnung 10 ist kleiner als der Durchmesser der Querschnittsfläche des Kanals 9. Beim Spritzgießen wird der Kunststoff 4 in den Kanal 9 eingespritzt. Durch dieses Hinterspritzen des Magneten 3 mit dem dabei vorherrschenden Druck der Kunststoffschmelze wird der Magnet 3 nach radial außen gegen die Wandung der Spritzgießform in seine Endposition gedrückt. Diese Bewegung ist deutlich kleiner als die Höhe h der Stege 8. Mit dem Abkühlen und Aushärten der Kunststoffschmelze 4 ist der Magnet 3 in seiner Endposition fixiert . Figure 3 shows a channel 9 in an enlarged view. The channel 9 has over its longitudinal extent a directed towards the magnet 3 opening 10. The width of the opening 10 is smaller than the diameter of the cross-sectional area of the channel 9. In injection molding, the plastic 4 is injected into the channel 9. By this injection of the back of the magnet 3 with the prevailing pressure of the plastic melt, the magnet 3 is pressed radially outward against the wall of the injection mold in its final position. This movement is significantly smaller than the height h of the webs 8. With the cooling and curing of the plastic melt 4, the magnet 3 is fixed in its end position.

Claims

Patentansprüche claims
1. Rotor eines Elektromotors mit einem Ankerblechpaket , einer Welle, am Umfang des Ankerblechpakets angeordnete Magnete und einer Kunststoffumspritzung, d a d u r c h g e k e n n z e i c h n e t , dass das Ankerblechpaket (1) an seinem Umfang zu jedem Magnet (3) mindestens ein zuge¬ ordneten Kanal (9) aufweist, wobei die Kanäle (9) parallel zur Welle verlaufen und dass das Ankerblechpaket (1) am Umfang radial ausgerichtete Stege (8) besitzt, wobei sich die Stege (8) parallel zur Welle erstrecken und zwischen zwei Stegen (8) je ein Magnet (9) angeordnet ist, und dass die Kunststoffumspritzung (4) das Ankerblechpaket (1) und die Magnete (3) soweit umhüllt, dass nur die radiale Außenseite der Magneten (3) frei von Kunststoff (4) ist. 1. rotor of an electric motor with an anchor plate package, a shaft, arranged on the circumference of the anchor plate package magnets and a Kunststoffumspritzung, characterized in that the anchor plate package (1) at its periphery to each magnet (3) has at least one associated ¬ channel (9), wherein the channels (9) extend parallel to the shaft and that the armature lamination packet (1) has radially aligned webs (8) on the circumference, wherein the webs (8) extend parallel to the shaft and between two webs (8) each a magnet (9 ), and that the plastic extrusion coating (4) encloses the laminated core (1) and the magnets (3) to such an extent that only the radial outer side of the magnets (3) is free of plastic (4).
2. Rotor nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass die Kanäle (9) eine runde, dreieckige oder polygone Querschnittsfläche aufweisen. 2. Rotor according to claim 1, characterized in that the channels (9) have a round, triangular or polygonal cross-sectional area.
3. Rotor nach Anspruch 1, d a d u r c h g e k e n n z e i c h n e t , dass zumindest die radial außenliegenden Kanten (5) der Magnete (3) Fasen (10) besitzen und die Fasen (10) vom Kunststoff (4) umgeben sind. 3. Rotor according to claim 1, characterized in that at least the radially outer edges (5) of the magnets (3) have chamfers (10) and the chamfers (10) are surrounded by the plastic (4).
4. Rotor nach zumindest einem der vorhergehenden Ansprüche, d a d u r c h g e k e n n z e i c h n e t , dass die Stege (8) eine geringere Höhe als die Magnete (3) aufweisen. 4. Rotor according to at least one of the preceding claims, characterized in that the webs (8) have a lower height than the magnets (3).
5. Verfahren zur Herstellung eines Rotors nach Anspruch 1, bei dem ein Ankerblechpaket auf eine Welle aufgebracht wird, dass das Ankerblechpaket mit der Welle und den Magneten in eine Spritzgießform eingelegt wird und mit Kunststoff umspritzt wird, d a d u r c h g e k e n n z e i c h n e t , dass der Kunststoff stirnseitig in die Kanäle im Anker¬ blechpaket eindringt und die Magneten in radialer Richtung gegen die Spritzgießform drückt. 5. A method for producing a rotor according to claim 1, wherein an anchor plate package is applied to a shaft, that the anchor plate package is inserted with the shaft and the magnet in an injection mold and molded with plastic, characterized in that the plastic end face in the channels penetrates the armature ¬ sheet package and presses the magnets in the radial direction against the injection mold.
EP13792013.8A 2012-11-23 2013-11-18 Rotor of an electric motor and method for producing the rotor Withdrawn EP2923432A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012221422.4A DE102012221422A1 (en) 2012-11-23 2012-11-23 Rotor of an electric motor and method of manufacturing the rotor
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KR20150086484A (en) 2015-07-28
JP2016502389A (en) 2016-01-21
US20150303752A1 (en) 2015-10-22
WO2014079794A1 (en) 2014-05-30
CN104798289A (en) 2015-07-22
US10224772B2 (en) 2019-03-05
DE102012221422A1 (en) 2014-05-28

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