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EP2795772A2 - Magnet wheel - Google Patents

Magnet wheel

Info

Publication number
EP2795772A2
EP2795772A2 EP12809792.0A EP12809792A EP2795772A2 EP 2795772 A2 EP2795772 A2 EP 2795772A2 EP 12809792 A EP12809792 A EP 12809792A EP 2795772 A2 EP2795772 A2 EP 2795772A2
Authority
EP
European Patent Office
Prior art keywords
carrier hub
magnetic wheel
notch
slot
wheel according
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Withdrawn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
EP12809792.0A
Other languages
German (de)
French (fr)
Inventor
Lothar Schröder
Jan Weimar
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 EP2795772A2 publication Critical patent/EP2795772A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • 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
    • H02K1/2726—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of a single magnet or two or more axially juxtaposed single magnets
    • H02K1/2733—Annular 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
    • H02K1/30—Means for mounting or fastening rotating magnetic parts on to, or to, the rotor structures using intermediate parts, e.g. spiders
    • 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
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors

Definitions

  • Magnetic Wheel for an electric motor, comprising a shaft and a disc made of a magnetic particles contained plastic, wherein the disc is arranged on a carrier hub and the carrier hub is pressed with the shaft.
  • Such magnetic wheels are used in brushless DC motors as part of position sensors and are therefore known.
  • the disk of the magnetic wheel is produced by injection molding a plastic containing iron particles onto the carrier hub.
  • the carrier hub is a closed ring made of a suitable material such as steel or brass. Subsequently, the carrier hub is pressed with the molded disc onto the shaft.
  • the disadvantage of this design is that due to manufacturing tolerances of the shaft when pressing the carrier hub sometimes considerable stresses in the carrier hub occur, which reduce the life of the magnetic wheel. In particularly bad cases, magnetic wheel damage can occur, which can lead to malfunctions in the position sensor.
  • the invention is therefore an object of the invention to provide a magnetic wheel, in the production-related stresses do not lead to an impairment of individual components.
  • the carrier hub is formed as a slotted ring, around which the disc is molded by injection molding.
  • the slotted design of the carrier hub allows a much better response to tolerances of the shaft.
  • the carrier hub thereby surrounds the shaft as a kind of spring and can thereby widening at larger shaft diameters. In this way, stresses in the carrier hub are significantly reduced, which increases the life of the magnetic wheel. Due to the greater toughness of the plastic, the expansion of the carrier hub does not significantly increase the stresses in the disk.
  • Another advantage is that due to the slotted carrier hub and larger manufacturing tolerances in the shaft diameter and the hub bore are allowed, which simplifies the production.
  • the production is very cost-effective when the ring for the carrier hub is rolled from strip material.
  • the ring for the carrier hub can be in another embodiment, as before, a turned or stamped part, in which a slot is introduced. This is particularly advantageous if the ring is still processed before encapsulation.
  • An intimate connection of carrier hub and disc is achieved with a notch in the form of at least one imprint, preferably in the form of a Rändeis.
  • the notch is particularly easy to produce in another embodiment, if it is a single recess in the carrier hub, which is arranged opposite the slot. A single recess is often sufficient due to the low torque to be transmitted. It is also advantageous that so wide areas of the carrier hub are present, which allow a relative movement of plastic and carrier hub.
  • two to four recesses can be arranged in the carrier hub, which are arranged symmetrically to the slot.
  • the invention is explained in detail. It shows in:
  • FIG. 1 shows a magnetic wheel in half section
  • Figures 2, 3 further embodiments of the carrier hub.
  • the magnetic wheel 1 consists of a shaft 2, which may be the shaft of an electronically commutated electric motor, and a disc 3 made of ferrite-bonded plastic.
  • the synthetic material is molded onto a carrier hub 4 by means of injection molding.
  • the carrier hub has a slot 5, which is arranged in the cutting plane for better visibility. Opposite of the slot 5 and thus at a distance of 180 °, the carrier hub 4 radially outwardly a notch 6 in the form of a recess 8. In the injection molding of the ferrite-bound plastic, this fills the notch 6 and thereby produces an intimate bond with the carrier hub 4.
  • the carrier hub 4 When pressing the carrier hub 4 with the disc 3 on the shaft 2, the carrier hub 4 can expand, where it is in the areas right and left of the slot 5 can come to relative movements between the carrier hub 4 and disc 3.
  • the carrier hub 4 is shown without the disc and the shaft. 2 shows the carrier hub 4 with a notch 6 in the form of two knurls 7.
  • the knurls 7 are arranged in a region which is symmetrically opposite the slot 5 and extends over 60 °.
  • the knurls 7 each extend over a range of 20 ° and have a distance of 20 ° from each other.
  • the knurls 7 thus have a distance from the slot 5 of 150 °.
  • the carrier hub 4 in Fig. 3 has a notch 6 in the form of three symmetrically to the slot 5 arranged recesses 8, which have a distance of 30 ° to each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Brushless Motors (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a magnet wheel (1) for an electric motor, comprising a shaft (2) and a disk (3) made of a plastic containing magnetic particles, wherein the disk (3) is arranged on a carrying hub (4) and the carrying hub (4) is pressed onto the shaft (2). The carrying hub (4) is designed as a slotted ring around which the disk (3) is molded on by means of injection molding.

Description

Beschreibung Magnetrad Gegenstand der Erfindung ist ein Magnetrad für einen Elektromotor, bestehend aus einer Welle und einer Scheibe aus einem magnetische Partikel enthaltenen Kunststoff, wobei die Scheibe auf einer Trägernabe angeordnet ist und die Trägernabe mit der Welle verpresst ist. Description Magnetic Wheel The invention relates to a magnetic wheel for an electric motor, comprising a shaft and a disc made of a magnetic particles contained plastic, wherein the disc is arranged on a carrier hub and the carrier hub is pressed with the shaft.
Derartige Magneträder kommen in bürstenlosen Gleichstrommotoren als Bestandteil von Positionssensoren zum Einsatz und sind daher bekannt. Die Scheibe des Magnetrades wird durch Spritzgießen eines Eisenpartikel enthaltenden Kunststoffs auf die Trägernabe erzeugt. Die Trägernabe ist ein geschlossener Ring aus einem geeigneten Material wie Stahl oder Messing. Anschließend wird die Trägernabe mit der angespritzten Scheibe auf die Welle aufgepresst. Der Nachteil bei dieser Gestaltung besteht darin, dass aufgrund fertigungsbedingter Tole- ranzen der Welle beim Aufpressen der Trägernabe mitunter erhebliche Spannungen in der Trägernabe auftreten, welche die Lebensdauer des Magnetrades verringern. In besonders schlimmen Fällen drohen Beeinträchtigungen des Magnetrades, die zu Fehlfunktionen im Positionssensor führen können. Such magnetic wheels are used in brushless DC motors as part of position sensors and are therefore known. The disk of the magnetic wheel is produced by injection molding a plastic containing iron particles onto the carrier hub. The carrier hub is a closed ring made of a suitable material such as steel or brass. Subsequently, the carrier hub is pressed with the molded disc onto the shaft. The disadvantage of this design is that due to manufacturing tolerances of the shaft when pressing the carrier hub sometimes considerable stresses in the carrier hub occur, which reduce the life of the magnetic wheel. In particularly bad cases, magnetic wheel damage can occur, which can lead to malfunctions in the position sensor.
Der Erfindung liegt daher die Aufgabe zugrunde, ein Magnetrad zu schaffen, bei dem herstellungsbedingt auftretende Belastungen nicht zu einer Beeinträchtigung einzelner Bestandteile führen . The invention is therefore an object of the invention to provide a magnetic wheel, in the production-related stresses do not lead to an impairment of individual components.
Gelöst wird die Aufgabe dadurch, dass die Trägernabe als geschlitzter Ring ausgebildet ist, um den die Scheibe mittels Spritzgießens angeformt ist. Die geschlitzte Ausführung der Trägernabe erlaubt ein wesentlich besseres Reagieren auf Toleranzen der Welle. Die Trägernabe umgibt dadurch die Welle als eine Art Feder und kann sich dadurch bei größeren Wellendurchmessern aufweiten. Auf diese Weise werden Spannungen in der Trägernabe deutlich reduziert, was die Lebensdauer des Magnetrades erhöht. Aufgrund der größeren Zähigkeit des Kunststoffs trägt das Aufweiten der Trägernabe nicht wesentlich zur Erhöhung der Spannungen in der Scheibe bei. Ein weiterer Vorteil besteht darin, dass aufgrund der geschlitzten Trägernabe auch größere Fertigungstoleranzen beim Wellendurchmesser und der Nabenbohrung zulässig sind, was die Herstellung vereinfacht. The object is achieved in that the carrier hub is formed as a slotted ring, around which the disc is molded by injection molding. The slotted design of the carrier hub allows a much better response to tolerances of the shaft. The carrier hub thereby surrounds the shaft as a kind of spring and can thereby widening at larger shaft diameters. In this way, stresses in the carrier hub are significantly reduced, which increases the life of the magnetic wheel. Due to the greater toughness of the plastic, the expansion of the carrier hub does not significantly increase the stresses in the disk. Another advantage is that due to the slotted carrier hub and larger manufacturing tolerances in the shaft diameter and the hub bore are allowed, which simplifies the production.
Die Herstellung gestaltet sich sehr kostengünstig, wenn der Ring für die Trägernabe aus Bandmaterial gerollt ist. The production is very cost-effective when the ring for the carrier hub is rolled from strip material.
Der Ring für die Trägernabe kann in einer anderen Ausgestal- tung wie bisher ein Dreh- oder Stanzteil sein, in welches ein Schlitz eingebracht ist. Dies ist insbesondere dann von Vorteil, wenn der Ring vor dem Umspritzen noch bearbeitet wird. The ring for the carrier hub can be in another embodiment, as before, a turned or stamped part, in which a slot is introduced. This is particularly advantageous if the ring is still processed before encapsulation.
Infolge der Aufweitung der Trägernabe kann es zu einer Rela- tivbewegung von Scheibe und Trägernabe kommen. Dabei hat es sich als vorteilhaft erwiesen, Trägernabe und Scheibe zur sicheren Drehmonentübertragung miteinander zu verbinden, indem die Trägernabe radial außen eine Einkerbung aufweist. Eine sichere Verbindung von Trägernabe und Scheibe ohne dabei das Aufweiten der Trägernabe zu verhindern, wird mit einer Einkerbung erreicht, wenn diese in einem Bereich angeordnet dessen Enden mindestens 90° entfernt von dem Schlitz angeordnet ist. Danach ist jeweils mindestens 90° links und rechts des Schlitzes keine Einkerbung angeordnet. In diesen Bereich kann es zu einer Relativbewegung zwischen Scheibe und Trägernabe beim Aufweiten kommen. Spannungen werden dadurch minmiert . Due to the widening of the carrier hub, there may be a relative movement of the disk and the carrier hub. It has proved to be advantageous carrier hub and disc for safe torque transmission to connect with each other by the carrier hub radially outwardly has a notch. A secure connection of the carrier hub and disc without thereby preventing the expansion of the carrier hub, is achieved with a notch, when arranged in a region whose ends are arranged at least 90 ° away from the slot. Thereafter, at least 90 ° left and right of the slot no notch is arranged. In this area, there may be a relative movement between the disc and the carrier hub when expanding. Voltages are thereby minmiert.
Eine innige Verbindung von Trägernabe und Scheibe wird mit einer Einkerbung in Form von mindestens einer Einprägung, vorzugsweise in Form eines Rändeis, erreicht. Die Einkerbung ist in einer anderen Ausgestaltung besonders einfach herstellbar, wenn sie eine einzelne Ausnehmung in der Trägernabe ist, die dem Schlitz gegenüberliegend angeordnet ist. Eine einzelne Ausnehmung ist aufgrund des geringen zu übertragenden Drehmoments oftmals ausreichend. Vorteilhaft kommt hinzu, dass so weite Bereiche der Trägernabe vorhanden sind, die eine Relativbewegung von Kunststoff und Trägernabe zulassen . An intimate connection of carrier hub and disc is achieved with a notch in the form of at least one imprint, preferably in the form of a Rändeis. The notch is particularly easy to produce in another embodiment, if it is a single recess in the carrier hub, which is arranged opposite the slot. A single recess is often sufficient due to the low torque to be transmitted. It is also advantageous that so wide areas of the carrier hub are present, which allow a relative movement of plastic and carrier hub.
Für größere Momentübertragungen lassen sich zwei bis vier Ausnehmungen in der Trägernabe anordnen, die symmetrisch zu dem Schlitz angeordnet sind. An einem Ausführungsbeispiel wird die Erfindung näher erläutert. Es zeigt in: For larger torque transmissions, two to four recesses can be arranged in the carrier hub, which are arranged symmetrically to the slot. In one embodiment, the invention is explained in detail. It shows in:
Figur 1 ein Magnetrad im Halbschnitt, Figuren 2, 3 weitere Ausführungsformen der Trägernabe. 1 shows a magnetic wheel in half section, Figures 2, 3 further embodiments of the carrier hub.
Das Magnetrad 1 besteht aus einer Welle 2, die die Welle eines elektronisch kommutierten Elektromotors sein kann, und einer Scheibe 3 aus ferritgebundenen Kunststoff. Der Kunst- Stoff wird auf eine Trägernabe 4 mittels Spritzgießen angeformt. Die Trägernabe weist einen Schlitz 5 auf, der zur besseren Sichtbarkeit in der Schnittebene angeordnet ist. Gegenüberliegend von dem Schlitz 5 und damit in einem Abstand von 180° weist die Trägernabe 4 radial außen eine Einkerbung 6 in Form einer Ausnehmung 8 auf. Beim Spritzgießen des ferritgebundenen Kunststoffs füllt dieser die Einkerbung 6 aus und erzeugt dadurch einen innigen Verbund mit der Trägernabe 4. Beim Aufpressen der Trägernabe 4 mit der Scheibe 3 auf die Welle 2 kann sich die Trägernabe 4 aufweiten, wobei es in den Bereichen rechts und links des Schlitzes 5 zu Relativbewegungen zwischen Trägernabe 4 und Scheibe 3 kommen kann. In den folgenden Figuren ist die Trägernabe 4 ohne die Scheibe und die Welle dargestellt. Fig. 2 zeigt die Trägernabe 4 mit einer Einkerbung 6 in Form von zwei Rändeln 7. Die Rändel 7 sind in einem Bereich angeordnet, der dem Schlitz 5 symmet- risch gegenüberliegt und sich über 60° erstreckt. Die Rändel 7 erstrecken sich jeweils über einen Bereich von 20° und weisen zueinander einen Abstand von 20° auf. Die Rändel 7 weisen somit einen Abstand zum Schlitz 5 von 150° auf. Die Trägernabe 4 in Fig. 3 besitzt eine Einkerbung 6 in Form von drei symmetrisch zum Schlitz 5 angeordneten Ausnehmungen 8, die zueinander einen Abstand von 30° aufweisen. The magnetic wheel 1 consists of a shaft 2, which may be the shaft of an electronically commutated electric motor, and a disc 3 made of ferrite-bonded plastic. The synthetic material is molded onto a carrier hub 4 by means of injection molding. The carrier hub has a slot 5, which is arranged in the cutting plane for better visibility. Opposite of the slot 5 and thus at a distance of 180 °, the carrier hub 4 radially outwardly a notch 6 in the form of a recess 8. In the injection molding of the ferrite-bound plastic, this fills the notch 6 and thereby produces an intimate bond with the carrier hub 4. When pressing the carrier hub 4 with the disc 3 on the shaft 2, the carrier hub 4 can expand, where it is in the areas right and left of the slot 5 can come to relative movements between the carrier hub 4 and disc 3. In the following figures, the carrier hub 4 is shown without the disc and the shaft. 2 shows the carrier hub 4 with a notch 6 in the form of two knurls 7. The knurls 7 are arranged in a region which is symmetrically opposite the slot 5 and extends over 60 °. The knurls 7 each extend over a range of 20 ° and have a distance of 20 ° from each other. The knurls 7 thus have a distance from the slot 5 of 150 °. The carrier hub 4 in Fig. 3 has a notch 6 in the form of three symmetrically to the slot 5 arranged recesses 8, which have a distance of 30 ° to each other.

Claims

Magnetrad für einen Elektromotor, bestehend aus einer Wel le und einer Scheibe aus einem magnetische Partikel ent¬ haltenen Kunststoff, wobei die Scheibe auf einer Trägerna be angeordnet ist und die Trägernabe mit der Welle verpresst ist, d a d u r c h g e k e n n z e i c h n e t , dass die Trägernabe (4) als geschlitzter Ring ausgebildet ist, um den die Scheibe (3) mittels Spritzgießens Magnetic wheel for an electric motor, consisting of a Wel le and a disc of a magnetic particles ent ¬ held plastic, wherein the disc is arranged on a Trägerna be and the carrier hub is pressed with the shaft, characterized in that the carrier hub (4) as a slotted Ring is formed to which the disc (3) by injection molding
angeformt ist. is formed.
Magnetrad 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 Trägernabe (4) aus Bandmaterial gerollt ist. Magnetic wheel according to claim 1, characterized in that the carrier hub (4) is rolled from strip material.
Magnetrad 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 Trägernabe (4) ein Dreh- oder Stanzteil ist, in welches ein Schlitz (5) eingebracht ist Magnetic wheel according to claim 1, characterized in that the carrier hub (4) is a rotary or stamped part, in which a slot (5) is introduced
Magnetrad 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 Trägernabe (4) radial außen eine Einkerbung (6) aufweist. Magnetic wheel according to at least one of the preceding claims, characterized in that the carrier hub (4) radially outwardly has a notch (6).
Magnetrad nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , dass die Einkerbung (6) in einem Bereich angeordnet ist, und die Enden des Bereichs mindestens 90° entfernt von dem Schlitz (5) entfernt angeordnet ist. Magnetic wheel according to claim 4, wherein the notch (6) is arranged in a region, and the ends of the region is arranged at least 90 ° away from the slot (5).
Magnetrad nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t , dass die Einkerbung (6) in Form von mindestens einer Einprägung, vorzugsweise in Form eines Rändeis (7), ausgebildet ist. Magnetic wheel according to claim 5, characterized in that the notch (6) in the form of at least one imprint, preferably in the form of a Rändeis (7), is formed.
Magnetrad nach Anspruch 4, d a d u r c h g e k e n n z e i c h n e t , dass die Einkerbung (6) eine einzelne Ausnehmung (8) in der Trägernabe (4) ist, die dem Schlitz (5) gegenüberliegend angeordnet ist. Magnetic wheel according to claim 4, characterized in that the notch (6) is a single Recess (8) in the carrier hub (4), which is arranged opposite the slot (5).
Magnetrad nach Anspruch 5, d a d u r c h g e k e n n z e i c h n e t , dass die Einkerbung (6) zwei bis vier Ausnehmungen (8) in der Trägernabe (4) sind, die symmet¬ risch zu dem Schlitz (5) angeordnet sind. Magnetic wheel according to claim 5, characterized in that the notch (6) are two to four recesses (8) in the carrier hub (4), which are arranged symmet ¬ risch to the slot (5).
EP12809792.0A 2011-12-20 2012-12-19 Magnet wheel Withdrawn EP2795772A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102011089243A DE102011089243A1 (en) 2011-12-20 2011-12-20 magnetic wheel
PCT/EP2012/076069 WO2013092653A2 (en) 2011-12-20 2012-12-19 Magnet wheel

Publications (1)

Publication Number Publication Date
EP2795772A2 true EP2795772A2 (en) 2014-10-29

Family

ID=47501241

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12809792.0A Withdrawn EP2795772A2 (en) 2011-12-20 2012-12-19 Magnet wheel

Country Status (7)

Country Link
US (1) US9882456B2 (en)
EP (1) EP2795772A2 (en)
JP (1) JP6066128B2 (en)
KR (1) KR20140117357A (en)
CN (1) CN104040852B (en)
DE (1) DE102011089243A1 (en)
WO (1) WO2013092653A2 (en)

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WO2017046457A1 (en) * 2015-09-14 2017-03-23 Sc2N Magnetic target
DE102015121102B4 (en) * 2015-12-03 2019-11-07 Bühler Motor GmbH Rotor device for an electric motor and / or generator, rotor and motor with such a rotor device and manufacturing method
CN212340273U (en) * 2017-10-31 2021-01-12 三菱电机株式会社 Rotation angle detection device

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Also Published As

Publication number Publication date
JP6066128B2 (en) 2017-01-25
WO2013092653A2 (en) 2013-06-27
CN104040852A (en) 2014-09-10
JP2015503321A (en) 2015-01-29
CN104040852B (en) 2018-04-17
KR20140117357A (en) 2014-10-07
US20140361644A1 (en) 2014-12-11
US9882456B2 (en) 2018-01-30
WO2013092653A3 (en) 2014-06-19
DE102011089243A1 (en) 2013-06-20

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