WO2002075900A1 - Electric motor stand with permanent magnets - Google Patents

Electric motor stand with permanent magnets Download PDF

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Publication number
WO2002075900A1
WO2002075900A1 PCT/CZ2001/000064 CZ0100064W WO02075900A1 WO 2002075900 A1 WO2002075900 A1 WO 2002075900A1 CZ 0100064 W CZ0100064 W CZ 0100064W WO 02075900 A1 WO02075900 A1 WO 02075900A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnets
electric motor
segments
laminated core
stand
Prior art date
Application number
PCT/CZ2001/000064
Other languages
German (de)
French (fr)
Inventor
Miloslav Hnilica
Original Assignee
Magneton A.S.
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 Magneton A.S. filed Critical Magneton A.S.
Publication of WO2002075900A1 publication Critical patent/WO2002075900A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/15—Mounting arrangements for bearing-shields or end plates
    • 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
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
    • H02K23/04—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having permanent magnet excitation

Definitions

  • the stands of the electric DC motors with permanent magnets which are used to drive the electric starters for internal combustion engines of motor vehicles, are formed as rolled-up shells made of sheet steel, within the shells the segments of the permanent magnets are glued.
  • the disadvantage of the segments glued in in this way is that they are not locked in any way, so they can come loose, or the locking is technologically difficult to manufacture.
  • These segments of the permanent magnets glued in this way also produce an uneven distribution of the magnetic inductance because the wall formed by the segment of the permanent magnet and the wall of the steel sheet jacket are wider than the wall of the steel sheet jacket except for the segments of the permanent magnets.
  • stator of the electric motor with permanent magnets consisting of a composite circular laminated core, on the inner surface of which the segments of the permanent magnets rest, where the stator is the front and the rear Cover of the electric motor are assigned.
  • the essence of the invention is that, on the inner circumferential surface of the laminated core, flat circular recesses bordered by edges are formed according to the number of magnetic poles. In the circular recesses, the number of which corresponds to the number of magnetic poles on the inner surface, segments of the permanent magnets are accommodated.
  • two opposite, mutually parallel shoulders are formed - mutually parallel surfaces, namely along the entire width of the laminated core, the center of which is on the axis of the segments of the permanent magnets.
  • the front and rear covers of the electric motor are also locked on these parallel surfaces.
  • the advantage of the embodiment according to the invention is that the permanent magnets in the stator are easily accommodated in the correct mounting position, radially and axially, without any further technological operations, such as punching the locking projections or using different sheet metal spacers or complicated mounting devices, in particular under the conditions of automated mounting ,
  • the stator cross-section is changed according to the need for the constant inductance of the magnetic circuit, the material of the magnetic circuit is optimally used.
  • This has the advantage of reducing the total stand weight.
  • the advantage of the space formed within the stand for guiding the connecting means connecting the front and the rear cover of the electric motor is that it does not disturb the entire outer contour of the electric motor with regard to later assembly and the overall design of the finished product.
  • FIG. 1 shows the axonometric view of the stand package with the marking of flat recesses for receiving the segments of the permanent magnets and for guiding the 2 represents the axonometric view of the stand with segments of the permanent magnets received
  • FIG. 3 shows the axonometric view of the stand and its connection to the front and rear cover of the electric motor
  • FIG. 4 is the shape of the magnetic field of the stator shown in a section perpendicular to the longitudinal axis in relation to the choice of the stator and in relation to the regular distribution of the magnetic inductance in the entire cross section of the stator.
  • the stand is formed from a composite circular laminated core 1 connected by a known method, e.g. with longitudinal welds or at the same time with locking protrusions punched during sheet metal stamping.
  • Flat circular recesses 12 delimited by edges 13 are formed on the inner surface 11 of the laminated core 1 according to the number of poles of the stator.
  • the segments 2 of the permanent magnets are glued into the circular recesses 12.
  • On the inner surface 14 of the laminated core two mutually parallel mutually parallel surfaces 4 are formed along their entire width 15. The length 16 of these surfaces 4 is given by the necessary magnetic cross section.
  • the center of the parallel surfaces 4 is on the axis 7 of the segments 2 of the permanent magnets, i.e. in places where the material is not magnetically loaded.
  • 5J of the front cover 5 are on the support surface and, on the support surface 6 ⁇ _ of the rear cover 6, the projections 5 2 and 6.2 are formed, with which both covers are locked on the parallel surfaces 4 (FIG. 3).

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

The invention relates to a stand for an electric motor, comprising permanent magnets, particularly for a starter in an internal combustion engine, consisting of a stack of circular steel sheets whose inner surface is associated with the permanent magnets. Flat, circular recesses (1.2) defined by edges (1.3) are formed on the inner surface (1.1) of the stack of steel sheets (1) according to the number of magnetic poles, the segments (2) of the permanent magnets being accommodated in circular recesses (1.2). Two opposite-lying shoulders (4) which are mutually parallel are formed on the outer surface (1.4) of the stack of steel sheets (1), the centre thereof being disposed on the axis (7) of the segments (2) of the permanent magnets. Open indentations (3) are formed on the inner surface (1.1) of the stack of steel sheets (1) in the area between the segments (2) of the permanent magnets, whereby the connecting means connecting the front cover (5) and the back cover (6) of the electric motor extends therethrough. The front cover (5) and the back cover (6) of the electromotor are arrested in the parallel shoulders (4).

Description

Ständer des Elektromotors mit PermanentmagnetenStator of the electric motor with permanent magnets
Die Erfindung betrifft den Ständer mit Permanentmagneten, insbesondere für Anlasser für Verbrennungskraftmaschinen.The invention relates to the stator with permanent magnets, in particular for starters for internal combustion engines.
Die Ständer der elektrischen Gleichstrommotoren mit Permanentmagneten, die für den Antrieb der elektrischen Anlasser für Verbrennungskraftmaschinen der Kraftfahrzeuge verwendet werden, sind als zusammengerollte Mäntel aus Stahlblech gebildet, innerhalb der Mäntel sind die Segmente der Permanentmagneten eingeklebt. Der Nachteil der so eingeklebten Segmente ist der, dass diese auf keine Weise arretiert sind, es kann also zu deren Lösen kommen, beziehungsweise ist die Arretierung technologisch schwierig herzustellen. Diese so eingeklebten Segmente der Permanentmagneten erzeugen auch eine ungleichmäßige Verteilung der magnetischen Induktivität, weil die vom Segment des Permanentmagneten gebildete Wand und die Wand des Stahlblechmantels breiter als die Wand des Stahlblechmantels außer den Segmenten der Permanentmagneten sind.The stands of the electric DC motors with permanent magnets, which are used to drive the electric starters for internal combustion engines of motor vehicles, are formed as rolled-up shells made of sheet steel, within the shells the segments of the permanent magnets are glued. The disadvantage of the segments glued in in this way is that they are not locked in any way, so they can come loose, or the locking is technologically difficult to manufacture. These segments of the permanent magnets glued in this way also produce an uneven distribution of the magnetic inductance because the wall formed by the segment of the permanent magnet and the wall of the steel sheet jacket are wider than the wall of the steel sheet jacket except for the segments of the permanent magnets.
Weiter ist die Befestigung der Segmente der Permanentmagneten zum Stahlblechmantel mit Hilfe verschiedener Distanzstücke bekannt. Solche Befestigung der Permanentmagneten ist im US-Patent Nr. 4 745 319 beschrieben, wo die Permanentmagneten am Umfang des Ständermantels angeordnet sind und mit aus elastischem Material gefertigten Halterungen verbunden sind. Die Halterungen sind konstruktiv so gelöst, um die Permanentmagneten innerhalb des Stahlblechmantels halten zu können.Furthermore, the fastening of the segments of the permanent magnets to the steel sheet jacket using various spacers is known. Such attachment of the permanent magnets is described in US Pat. No. 4,745,319, where the permanent magnets are arranged on the circumference of the stator casing and are connected to brackets made of elastic material. The brackets are designed so that the permanent magnets can be held within the sheet steel jacket.
Der Nachteil dieser Befestigung der Permanentmagneten ist die Fertigung von Halte-Distanzstücken, weiter die Kompliziertheit der Befestigung sowie die Montagenanforderungen.The disadvantage of this attachment of the permanent magnets is the production of holding spacers, the complexity of the attachment and the assembly requirements.
Die Nachteile der bekannten Lösungen beseitigt der Ständer des Elektromotors mit Permanentmagneten nach der Erfindung, bestehend aus einem zusammengesetzten kreisförmigen Blechpaket, zu dessen Innenfläche die Segmente der Permanentmagneten aufliegen, wo dem Ständer der vordere und der hintere Deckel des Elektromotors zugeordnet sind. Das Wesen der Erfindung besteht darin, dass auf der inneren Umfangsfläche des Blechpakets nach der Zahl der magnetischen Pole flache kreisförmige mit Kanten angegrenzte Versenkungen gebildet sind. In den kreisförmigen Versenkungen, deren Zahl auf der inneren Fläche jeweils der Zahl der magnetischen Pole entspricht, sind sie Segmente der Permanentmagneten aufgenommen.The disadvantages of the known solutions are eliminated by the stator of the electric motor with permanent magnets according to the invention, consisting of a composite circular laminated core, on the inner surface of which the segments of the permanent magnets rest, where the stator is the front and the rear Cover of the electric motor are assigned. The essence of the invention is that, on the inner circumferential surface of the laminated core, flat circular recesses bordered by edges are formed according to the number of magnetic poles. In the circular recesses, the number of which corresponds to the number of magnetic poles on the inner surface, segments of the permanent magnets are accommodated.
Auf der äußeren Umfangsfläche des Blechpakets sind jeweils zwei gegenüberliegende zueinander parallel verlaufende Absätze gebildet - gegenseitig parallele Flächen, und zwar der ganzen Breite des Blechpakets entlang, dessen Mitte sich auf der Achse der Segmente der Permanentmagneten befindet. Auf diesen parallelen Flächen wird auch der vordere und der hintere Deckel des Elektromotors arretiert.On the outer circumferential surface of the laminated core, two opposite, mutually parallel shoulders are formed - mutually parallel surfaces, namely along the entire width of the laminated core, the center of which is on the axis of the segments of the permanent magnets. The front and rear covers of the electric motor are also locked on these parallel surfaces.
Für die Verbindung des vorderen und des hinteren Deckels des Elektromotors sind auf der Innenfläche des Blechpakets offene Einschnitte gebildet, durch die das den vorderen und den hinteren Deckel des Elektromotors verbindende Verbindungsmittel durchgeht.For the connection of the front and rear covers of the electric motor, open incisions are formed on the inner surface of the laminated core, through which the connecting means connecting the front and rear covers of the electric motor pass.
Der Vorteil der Ausführung nach der Erfindung ist eine leichte Aufnahme der Permanentmagneten im Ständer in die richtige Montageposition radial sowie axial ohne weitere technologische Arbeitsvorgänge, wie das Stanzen der Arretiervorsprünge oder die Verwendung von verschiedenen Blechdistanzstücken oder komplizierter Montagevorrichtungen ist, insbesondere unter den Bedingungen der automatisierten Montage. Hiermit, dass der Ständerquerschnitt nach dem Bedarf der konstanten Induktivität des magnetischen Kreises geändert wird, kommt es zur optimalen Nutzung des Materials des magnetischen Kreises. Das bringt den Vorteil der Reduzierung des gesamten Ständergewichts mit sich. Der Vorteil des gebildeten Raums innerhalb des Ständers für die Führung des den vorderen und den hinteren Deckel des Elektromotors verbindenden Verbindungsmittels ist, dass dieses die gesamte Außenkontur des Elektromotors hinsichtlich der späteren Montage sowie des gesamten Design des Fertigprodukts nicht stört. Dje vorliegende Erfindung wird anhand folgender technischer Beschreibung erläutert, die im Zusammenhang mit den beigelegten Zeichnungen erarbeitet ist, in denen die Fig. 1 die axonometrische Ansicht auf das Ständerpaket mit der Kennzeichnung von flachen Versenkungen für die Aufnahme der Segmente der Permanentmagneten und für die Führung der Bolzen darstellt, Fig. 2 stellt die axonometrische Ansicht auf den Ständer mit aufgenommenen Segmenten der Permanentmagneten dar, Fig. 3 stellt die axonometrische Ansicht auf den Ständer und seine Verbindung mit dem vorderen und hinteren Deckel des Elektromotors dar und in Fig. 4 ist die Form des magnetischen Feldes des Ständers im auf die Längsachse senkrechtem Schnitt dar im Bezug auf die Wahl des Ständers und im Bezug auf die regelmäßige Verteilung der magnetischen Induktivität im ganzen Querschnitt des Ständers gezeigt.The advantage of the embodiment according to the invention is that the permanent magnets in the stator are easily accommodated in the correct mounting position, radially and axially, without any further technological operations, such as punching the locking projections or using different sheet metal spacers or complicated mounting devices, in particular under the conditions of automated mounting , Hereby, that the stator cross-section is changed according to the need for the constant inductance of the magnetic circuit, the material of the magnetic circuit is optimally used. This has the advantage of reducing the total stand weight. The advantage of the space formed within the stand for guiding the connecting means connecting the front and the rear cover of the electric motor is that it does not disturb the entire outer contour of the electric motor with regard to later assembly and the overall design of the finished product. The present invention is explained with reference to the following technical description, which has been worked out in connection with the accompanying drawings, in which FIG. 1 shows the axonometric view of the stand package with the marking of flat recesses for receiving the segments of the permanent magnets and for guiding the 2 represents the axonometric view of the stand with segments of the permanent magnets received, FIG. 3 shows the axonometric view of the stand and its connection to the front and rear cover of the electric motor, and in FIG. 4 is the shape of the magnetic field of the stator shown in a section perpendicular to the longitudinal axis in relation to the choice of the stator and in relation to the regular distribution of the magnetic inductance in the entire cross section of the stator.
Der Ständer ist gemäß Fig. 1 bis 3 aus einem zusammengesetzten kreisförmigen mit einem bekannten Verfahren verbundenen Blechpaket 1 gebildet, z.B. mit Längsschweißungen oder gleichzeitig beim Blechstanzen gestanzten Arretiervorsprüngen. Auf der Innenfläche 11 des Blechpakets 1 sind nach der Polzahl des Ständers flache kreisförmige mit Kanten 13 abgegrenzte Versenkungen 12 gebildet. In die kreisförmigen Versenkungen 12 sind die Segmente 2 der Permanentmagneten eingeklebt. Auf der Innenfläche 14 des Blechpakets sind entlang ihrer ganzen Breite 15 jeweils zwei gegeneinanderliegende gegenseitig parallel verlaufende Flächen 4 gebildet. Die Länge 16 dieser Flächen 4 ist durch den notwendigen magnetischen Querschnitt gegeben. Die Mitte der parallelen Flächen 4 befindet sich auf der Achse 7 der Segmente 2 der Permanentmagneten, d.h. an Stellen, wo das Material nicht magnetisch belastet ist. Diese parallelen Flächen 4 sind auch, wie im weiteren beschrieben wird, für die Arretierung des vorderen Deckels 5 und des hinteren Deckels 6 des Elektromotors ausgenutzt. Auf der Innenfläche 11 des Blechpakets 1, im Raum zwischen den Segmenten 2 der Permanentmagneten, sind offene Einschnitte 3 gebildet, durch die das den vorderen Deckel 5 und den hinteren Deckel 6 verbindende Verbindungsmittel 8 durchgeht.1 to 3, the stand is formed from a composite circular laminated core 1 connected by a known method, e.g. with longitudinal welds or at the same time with locking protrusions punched during sheet metal stamping. Flat circular recesses 12 delimited by edges 13 are formed on the inner surface 11 of the laminated core 1 according to the number of poles of the stator. The segments 2 of the permanent magnets are glued into the circular recesses 12. On the inner surface 14 of the laminated core, two mutually parallel mutually parallel surfaces 4 are formed along their entire width 15. The length 16 of these surfaces 4 is given by the necessary magnetic cross section. The center of the parallel surfaces 4 is on the axis 7 of the segments 2 of the permanent magnets, i.e. in places where the material is not magnetically loaded. These parallel surfaces 4 are also used, as will be described below, for locking the front cover 5 and the rear cover 6 of the electric motor. Open incisions 3 are formed on the inner surface 11 of the laminated core 1, in the space between the segments 2 of the permanent magnets, through which the connecting means 8 connecting the front cover 5 and the rear cover 6 passes.
Zur Verbindung des Ständers mit dem vorderen Deckel 5 und mit dem hinteren Deckel 6 des Elektromotors sind auf der Auflagefläche 5J des vorderen Deckels 5 und, auf der Auflagefläche 6Λ_ des hinteren Deckels 6 die Vorsprünge 5 2 und 6,2 gebildet, mit denen beide Deckel auf den parallelen Flächen 4 (Fig. 3) arretiert sind. For connecting the stand to the front cover 5 and to the rear cover 6 of the electric motor, 5J of the front cover 5 are on the support surface and, on the support surface 6Λ_ of the rear cover 6, the projections 5 2 and 6.2 are formed, with which both covers are locked on the parallel surfaces 4 (FIG. 3).

Claims

PATENTANS PRÜCH EPATENTANS PRÜCH E
1 Ständer des Elektromotors mit Permanentmagneten, besonders für die Anlasser für die Verbrennungskraftmaschinen, bestehend aus einem zusammengesetzten kreisförmigen Blechpaket, dessen Innenfläche die Segmente der Permanentmagneten zugeordnet sind, dadurch gekennzeichnet, dass auf der inneren Umfangsfläche (1.1) des Blechpakets (1) nach der Zahl der magnetischen Pole flache kreisförmige mit Kanten (1.3) abgegrenzte Versenkungen (1.2) gebildet sind, wo in den kreisförmigen Versenkungen (1.2) die Segmente (2) der Permanentmagneten aufgenommen sind.1 stator of the electric motor with permanent magnets, especially for the starters for internal combustion engines, consisting of a composite circular laminated core, the inner surface of which is assigned to the segments of the permanent magnets, characterized in that on the inner peripheral surface (1.1) of the laminated core (1) according to the number the magnetic poles are formed in flat circular recesses (1.2) delimited with edges (1.3), where the segments (2) of the permanent magnets are accommodated in the circular recesses (1.2).
2. Ständer des Elektromotors mit Permanentmagneten nach Anspruch 1, dadurch gekennzeichnet, dass auf der inneren Umfangsfläche (1.4) des Blechpakets (1) jeweils zwei gegenüberliegende gegenseitig parallel verlaufende Absätze (4) gebildet sind, deren Mitte auf der Achse (7) der Segmente (2) der Permanentmagneten ist.2. Stand of the electric motor with permanent magnets according to claim 1, characterized in that on the inner peripheral surface (1.4) of the laminated core (1) two opposite mutually parallel shoulders (4) are formed, the center of which on the axis (7) of the segments (2) is the permanent magnet.
3. Ständer des Elektromotors mit Permanentmagneten nach einem der Ansprüche 1 ud 2, dadurch gekennzeichnet, dass auf der Innenfläche (1.1) des Blechpakets (1), im Raum zwischen den Segmenten (2) der Permanentmagneten offene Einschnitte (3) gebildet sind, durch die das den vorderen Deckel (5) und den hinteren Deckel (6) des Elektromotors verbindende Verbindungsmittel (8) durchgeht.3. Stator of the electric motor with permanent magnets according to one of claims 1 and 2, characterized in that open incisions (3) are formed on the inner surface (1.1) of the laminated core (1) in the space between the segments (2) of the permanent magnets which passes through the connecting means (8) connecting the front cover (5) and the rear cover (6) of the electric motor.
4. Ständer des Elektromotors mit Permanentmagneten nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass in den parallelen Absätzen (4) der vordere Deckel (5) und der hintere Deckel4. Stand of the electric motor with permanent magnets according to one of claims 1 to 3, characterized in that in the parallel paragraphs (4) of the front cover (5) and the rear cover
(6) des Elektromotors arretiert sind. (6) of the electric motor are locked.
PCT/CZ2001/000064 2001-03-20 2001-11-19 Electric motor stand with permanent magnets WO2002075900A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ2001999A CZ293220B6 (en) 2001-03-20 2001-03-20 Electric motor stator having permanent magnets
CZPV2001-999 2001-03-20

Publications (1)

Publication Number Publication Date
WO2002075900A1 true WO2002075900A1 (en) 2002-09-26

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WO (1) WO2002075900A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1404003A1 (en) * 2002-09-30 2004-03-31 Hitachi Koki Co., Ltd. Stator yoke for a commutator motor
US8013489B2 (en) * 2005-05-27 2011-09-06 Minebea Motor Manufacturing Corporation Small DC motor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695267A1 (en) * 1992-09-02 1994-03-04 Valeo Equip Electr Moteur Stator for electric motor used as starter motor for internal combustion engine - has interior inductor poles in body of stacks of panels and magnetic shunt for each inductor with two permanent magnets
EP0895334A2 (en) * 1997-07-31 1999-02-03 Denso Corporation Electric rotating machine having radially outwardly extending bulge on yoke

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2695267A1 (en) * 1992-09-02 1994-03-04 Valeo Equip Electr Moteur Stator for electric motor used as starter motor for internal combustion engine - has interior inductor poles in body of stacks of panels and magnetic shunt for each inductor with two permanent magnets
EP0895334A2 (en) * 1997-07-31 1999-02-03 Denso Corporation Electric rotating machine having radially outwardly extending bulge on yoke

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1404003A1 (en) * 2002-09-30 2004-03-31 Hitachi Koki Co., Ltd. Stator yoke for a commutator motor
US7064467B2 (en) 2002-09-30 2006-06-20 Hitachi Koki Co., Ltd. Commutator motor
CN1316720C (en) * 2002-09-30 2007-05-16 日立工机株式会社 Commutator motor
US7368843B2 (en) 2002-09-30 2008-05-06 Hitachi Koki Co., Ltd. Commutator motor
US7508109B2 (en) 2002-09-30 2009-03-24 Hitachi Koki Co., Ltd. Commutator motor
US8013489B2 (en) * 2005-05-27 2011-09-06 Minebea Motor Manufacturing Corporation Small DC motor
US8183730B2 (en) 2005-05-27 2012-05-22 Minebea Motor Manufacturing Corporation Motor
US8264112B2 (en) 2005-05-27 2012-09-11 Minnebea Motor Manufacturing Corporation Motor
US9124162B2 (en) 2005-05-27 2015-09-01 Minebea Co., Ltd. Motor
US10069391B2 (en) 2005-05-27 2018-09-04 Minebea Mitsumi Inc. Motor
US11444523B2 (en) 2005-05-27 2022-09-13 Minebea Mitsumi Inc. Motor

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CZ2001999A3 (en) 2002-11-13

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