[go: up one dir, main page]

EP0295744A1 - Rotor multipolaire - Google Patents

Rotor multipolaire Download PDF

Info

Publication number
EP0295744A1
EP0295744A1 EP88201180A EP88201180A EP0295744A1 EP 0295744 A1 EP0295744 A1 EP 0295744A1 EP 88201180 A EP88201180 A EP 88201180A EP 88201180 A EP88201180 A EP 88201180A EP 0295744 A1 EP0295744 A1 EP 0295744A1
Authority
EP
European Patent Office
Prior art keywords
moulding
magnetic
moulding device
mixture
passage member
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.)
Granted
Application number
EP88201180A
Other languages
German (de)
English (en)
Other versions
EP0295744B1 (fr
Inventor
Petrus Matheus Josephus Knapen
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.)
Kinetron BV
Original Assignee
Kinetron BV
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 Kinetron BV filed Critical Kinetron BV
Priority to AT88201180T priority Critical patent/ATE73259T1/de
Publication of EP0295744A1 publication Critical patent/EP0295744A1/fr
Application granted granted Critical
Publication of EP0295744B1 publication Critical patent/EP0295744B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • H01F41/0273—Imparting anisotropy
    • H01F41/028—Radial anisotropy

Definitions

  • the invention relates to a method and device for producig perma­nently magnetized objects, and multipolar rotors of small dimen­sions in particular.
  • the method according to the invention relates to the production of a magnetic object to be moulded in a moulding device from a mix­ture of grains of magnetic material and hardening binding agent, said object having pole areas of small dimensions, the mixture being subjected in a moulding cavity of a moulding body of the moulding device to temperature changes, gravity, mechanic forces or magnetic forces, or combinations of those.
  • the method according to the invention is characterized by the reduction of a strong, permanent magnet to fragments of fully magnetized anisotropic permanently magnetic material, the reduction of the fragments of fully magnetized anisotropic ma­terial to grains, until all grains are smaller than the width of a pole area, mixing those grains with the hardening binding agent, inserting the mixture into the moulding device, and ensuring that the mixture hardens in the moulding device, thus providing the permanently magnetized object as the final product.
  • This method can particularly be used to obtain grains that are smaller than 150 ⁇ m from desired, fully magnetized anisotropic permanently magnetic material or of another required size.
  • the invention also provides a method and device for reducing frag­ ments of fully magnetized anisotropic permanently magnetic ma­terial, in which the fragments are introduced between grinder bodies of which at least the surfaces that face the fragments are made of the same magnetic material. Specifically the fragments are inserted between two grinder bodies of which at least the surfaces that face each other have mutually opposite magnetic poles.
  • the invention provides a method and device in which the mixture inserted in the moulding device is led from at least a second moulding body that is larger than and similar in structure to the first stated moulding body to the first moulding body through a passage member, periodically replacing said filled first moulding body by an equal moulding body that is to be filled next, the first filled moulding body providing a permanently magnetized object as the final product.
  • a special characteristic of this method and moulding device is that the mixture is led to the first moulding body, while being subjected for at least a part of the passage member to magnetic forces originating from magnetic means near the surface at the passage member's inner circumference.
  • Another feature of the moulding device is that at least the inner circumference of a cross-section of the passage member is similar in structure to the inner circumference of a moulding body, the dimensions of the inner circumference gradually declining from that of the second moulding body to that of the first moulding body, the arrangement in which each cross-section near the inner circumference of the passage member is similar in structure to that of the moulding body and the inner circumference of the passage member extends conically from the second moulding body to the first moulding body being preferred.
  • the moulding device according to the invention is characterized by an axially symmetrical presser means that, under axial displacement thereof in the moulding device, presses the mixture in the direction of the first moulding body, while the presser means, composed of a mandrel protruding at least partially into the moulding device and having a closely fitting sleeve between the moulding device and the mandrel for pressing the mix­ture to the first moulding body, is preferred.
  • Another feature of the moulding device according to the invention is formed by the mandrel provided at at least a part of its sur­face with magnetic poles, the magnetic poles being aligned with those that are situated near the inner circumference of the second moulding body and with at least part of the passage member.
  • Such a moulding device may comprise fixed ribs that extend par­tially or entirely between interpolar areas between the poles of the magnetic means in the mandrel and the magnetic means in the moulding device, the sleeve comprising a periphery that closely fits to these ribs and can be displaced up to the passage member.
  • a system according to the invention is characterized by the above-­mentioned moulding device and grinding device, to which suitable supply and discharge means have been added.
  • FIG 8 shows fragments (60) of fully magnetized anisotropic per­manently magnetic material, which have been obtained by breaking a strong magnet of sintered permanently magnetic material such as SmCo5 or Sm2Co17 or other desired strong, permanently mag­netic material into small fragments.
  • This material has to be re­duced to grains, e.g. in a grinding device as described hereafter and represents the starting material then.
  • the grains take up a fixed position in the final product they are com­bined in a mixture with a hardening binding agent.
  • an object (80) of small dimensions will have be moulded as can be seen in figures 10A and 10C.
  • This object could e.g. be a stepper motor with stator poles of a clockwork with a diameter of 4 mm for the rotor and along the periphery 60 pole areas (90, 91) applied therein of alternatingly north poles N and south poles Z.
  • the invention shows in a moulding device (10) a first moulding body (11), a second moulding body (12), and a passage member (13) that can be connected between the two bodies.
  • Both the moulding bodies (11, 12) are similar in structure, although they are not of the same size. They incorpor­ate, inserted near their inner surfaces, magnetic means (30, 31) as indicated in figure 4, in which magnetic poles, referred to as N and Z for north and south, are situated at the inner circum­ference (32) of the moulding bodies.
  • These magnetic means serve to magnetically influence the mixture of the starting material and the hardening binding agent, and in particular the portion near the inner circumference (32), in order to establish pole areas, particularly linking up at the N, Z poles, to which in the mixture a garland (92) of magnetic flux lines links up.
  • This magnetic manipulation begins with the introduction of the mixture into the second moulding body (12). When carefully feeding the mixture through the moulding device in the direction of the arrow indi­cated by M to the first moulding body (11), the pole patterns in the mixture will be maintained.
  • first form body (11) When a part of the mixture has arrived in the first form body (11) it will be able to harden there, or it will have hardened almost or completely, so that the first moulding body (11) can be removed and a subsequent similar moulding body (11′) can be placed before it, the filled first moulding body thus providing a permanently magnetized object as the final product.
  • the magnetic means (30, 31) in the two moulding bodies (11, 12) can be slices or discs of desired permanently magnetic material. Strong magnets with high remanence B r are preferred. For this purpose certain iron compounds, SmCo alloys such as SmCO5, and Sm2Co17, as well as B-doped, Nd-Fe alloys.
  • the passage member (13) will preferably run gradually from the second moulding body (12) to the first moulding body (11).
  • the inner circumference can be a truncated cone, however, other shapes of the inner circumference are also possible.
  • each cross-section of the passage member will have to be similar to that of a moulding body in order to disturb the pole pattern formed in the mixture as little as possible when passing it through the moulding device.
  • the passage member will be a truncated pyramid, the cross-section of which transversely to the axis being a regular polygon, which polygon is similar to the cross-section of the two moulding bodies.
  • the cross-section of the passage member (13) begins as a circle and ends as a regular polygon, or the other way around, to which the two moulding bodies (11, 12) have to link up accordingly.
  • Suitable size ratios of the moulding body (11, 12) are e.g. for the respective inner diameters 10 mm and 4mm, while the length of the passage member (13), i.e. the height of the truncated cone, is 30 mm.
  • the reduction factor 2.5 can be easily deviated from.
  • FIG 10B the dotted part in figure 10A of the object (81) to be produced is shown enlarged.
  • the drawing represents a possible structure of pole areas (90, 91) composed from grains of fully magnetized anisotropic permanently magnetic material for an N-pole (90) or a Z-pole (91).
  • the mixture in the pole areas (90, 91) of the final product (80) comprises an as large as possible frac­tion of starting material.
  • the filling factor to be determined as the ratio of the volume of starting material per volume unit of mixture, should be as close to 1 as possible.
  • Such a mixture should comprise grains of the maximally admissable size, viz. the width of a pole in the final product on the one hand, and a graded composition of smaller grains in order to fill up the space between the larger grains on the other hand.
  • the small grains are preferably not so small that they can form an inextricable conglomerate, having, as a conse­quence of differences in orientation of the separate parts, a highly reduced magnetic moment as a whole.
  • Such a mixture will provide a minimal surface to be enveloped by the binding agent and will thus result in the largest possible filling factor.
  • the pole patterns can be established in the desired structure, as indicated in figure 10B. It will be understood that when introducing the mixture into the second, larger moulding body (12) the grains can be positioned correctly.
  • the grains can be positioned in the right direction, for in said moulding body, the grains are the most movable on the one hand, since the binding agents is at its most flowing there, and because the grains will have enough space to do so on the other hand.
  • the pole patterns will be maintained in the passage member (13) up to the first moulding body, where the final product is provided as described above.
  • Figure 8 shows a collection of fragments (60) of the fully mag­netized anisotropic permanemently magnetic material that is to be processed. These fragments have been obtained by breaking strong, permanent magnets of desired magnetic material into small frag­ments. These fragments (60) have to be reduced to granulated ma­terial or granulate of desired dimension.
  • the present invention provides a solu­tion by means of a grinding device, as schematically shown in figure 9.
  • the fragments (60) are introduced between two grinder bodies (70, 71) with facing magnetic surfaces (72, 73) of matching polarity.
  • the grinder bodies (70, 71) can be permanent mag­nets, or electromagnets, or a combination of those. In order to guide the flux lines these grinder bodies (70, 71) can partly con­sist of iron or another magnetic material, e.g. in a portion (74) as indicated in figure 9.
  • the grinder bodies (70, 71) can be ro­tated about a joint axis (A), and they can be pressed, either or not adjustably, as indicated in the direction of the arrows (f).
  • the entire grinding device can be incorporated in a yoke of suit­able magnetic material, again intended to guide the flux lines, in which a bottom portion (75) can be integrated with the yoke.
  • Passing the mixture through the moulding device (10) in the direc­tion of the arrow, indicated by M, can be established in several ways.
  • the hardening rate of the binding agent, the length of the moulding device (10) and its positioning (horizontally, inclined, vertically, with removable moulding body (11) above or below) will also determine the passing through of the mixture. Thus even the elimination of gravity can be taken into account.
  • the passing through will particularly be established by presser means (20, 21, 22, 23) as indicated in figures 2A, 2B, 2C and 3. In these figures, the displacement of these means has been indicated by arrows (a, b, c, d and e). It will be understood that the presser means preferably are of non-magnetic material so as not to disturb the pole patterns.
  • the filling ma­terial between the magnetic means (30, 31) is non-magnetic, e.g. a synthetic material or metal, so that the flux line pattern at the inner circumference (32) of the moulding device is not disturbed either.
  • the two moulding bodies (11, 12), and, if necess­ary, the passage member (13), can be enveloped by a sleeve of mag­netically conductive material in order to guide the flux lines.
  • the presser means (20) is a cylindrical block that closely fits into the supply opening of the second moulding body (12).
  • the mixture can be pressed to the first moulding body (11) by careful pressing, with which the pole pattern will have to be maintained, and during which in the mean­time the mixture can be topped up, or the temperature can be in­creased or decreased for a part of the moulding device.
  • the block (20) can only be displaced up to the passage member (13).
  • Figure 2B shows an alternative way to leave an interspace (33) between the presser means (21), also being a cylindrical block, and the moulding device (10).
  • the length of the block (21) is the same as that in figure 2A, it may vary, dependent on the requirements at the used position of the moulding device (10), the binding agent used, and the chosen passage length. It will be clear that the form and the cross-section dimensions of the inter­space (33) are important to the preservation of the pole pattern in the mixture.
  • the respective circumferences of the block (21) and the inner circumference (32) of the second moulding body (12) will be concentric to the axis of the moulding device (10).
  • Figure 2C shows a presser means in the form of a mandrel (22), also having an interspace (35) between the mandrel and the mould­ing device (10) as indicated above, in which the interspace (33) extends over at least a part of the passage member (13).
  • the mandrel (22) can extend, contrary to the way it has been drawn in figure 2, up to the first moulding body (11).
  • the mandrel (22) can even end there, where the first moulding body (11) begins, in a point at dimensions chosen for that purpose for the diameter of the cylindrical part of it at regularly extending interspace (33), as indicated above.
  • Figure 3 shows a preferred embodiment of a presser means according to the invention.
  • the presser means is composed of a the above-­ described mandrel (22), and a cylindrical presser sleeve (23) to be displaced over the mandrel (22) in the second moulding body (12) in a close-fitting arrangement.
  • the mixture can be regularly pressed with the sleeve (23).
  • Topping up the mixture removing the first moulding body (11) and possible heating or cooling can be performed as indicated above. It will be clear that the sleeve (23) can be pressed up to the passage member (13).
  • Figure 5 shows a view of a cross-section along the line V-V in figure 3.
  • Interpolar areas 34 situated between alternating N- and Z-poles, are also schematically indicated.
  • Figure 6 shows a view similar to that of figure 5, but here mag­netic means (40, 41) have also been incorporated in the mandrel (22).
  • These magnetic means have at the surface of the mandrel alternating N- and Z-poles.
  • the N- and Z-poles on the inner circumference (32) of the moulding device (10) and the N- and Z-poles on the surface of the mandrel (22) will have to be aligned in the manner as drawn in the figure. This can e.g. be established by positioning the mandrel (22) fixedly with respect to the moulding device (10).
  • the thus formed magnetic areas in the mixture will have the shape of bar magnets according to this cross-section.
  • Figure 7 represents the case in which the interpolar areas (34, 44) of the moulding device (10) and the mandrel (22), respect­ively, are interconnected by ribs (50). These ribs can also merely extend partially from the moulding device (10) to the mandrel (22), or vice versa.
  • the presser sleeve (23) will comprise a cilindrical comb-like means, or a sleeve wall provided with relief, respectively, fitting into respective channels (51), as indicated in figure 7, or grooves, which, in the other stated case, will be formed between the ribs (50) that protrude there.
  • the ribs (50) will possibly not extend quite up to the first moulding body (11). On the one hand this is due to lack of room, on the other hand the bar magnets as indicated above will get so close to one another that further extending ribs will narrow down the pole areas of these bar magnets and thus hamper their operation.
  • the inner circumference (32) of the moulding device (10) and the surfaces of the fixedly posi­tioned mandrel (22) in figures 5, 6 or 7, and of the ribs (50) in figure 7, be provided with a coating that slides well, e.g. of teflon.
  • the ribs (50) can also be entirely made of teflon.
  • the first mould­ing body (11) that is to be filled may comprise a bottom portion, with which also a shaft, extending from the bottom along the axis in the moulding device (10), e.g. over the entire length of the moulding body (11), can be provided.
  • a shaft extending from the bottom along the axis in the moulding device (10), e.g. over the entire length of the moulding body (11), can be provided.
  • Such a recess could function as the place to secure a shaft.
  • the method according to the invention for producing permanently magnetized objects of the type as described above may also comprise the mixing, in a suitable manner, of binding agent and starting ma­terial, and feeding this mixture to the moulding device on the one hand, and sucking the mixture by means of vacuum into the first moulding body (11) on the other hand.
  • the first measure is met by feeding the starting material through a thin layer of binding agent by channels or tracks, and particularly by drawing the starting material through it by means of magnets.
  • the channels are preferably injection moulding channels. Along a supply end thereof, magnets can be periodicially passed.
  • the layer of binding agent around a grain is as thin as possible.
  • the second measure viz. sucking by means of vacuum, will ensure that possible air or gas bubbles are sucked off.
  • the density of the starting material can be further improved by this method.
  • An object (80), obtained as final product with the above-described devices and methods, can have a shape as drawn in figures 10A, 10C, showing a top and side view, respectively, of such an object.
  • the N- and Z-poles (90, 91) applied therein alternate and in this way can provide a multipolar rotor for a stepper motor in a clock­work.
  • the possible recess, extending along the shaft, destined for later securing of the rotor in a clockwork, has not been drawn. If the dimensions of the shaft give rise to such actions, it can be made of soft iron, so that it can serve as a magnetic guidance in the magnetic circuit of stator and rotor.
  • the described magnetic function can also be performed by a plate, ring or collection of ring seg­ments made of soft iron and inserted in a recess in the rotor body (80).
  • Multipolar rotors with diameters smaller than 4 mm can be produced by means of the above-described methods and devices. If such rotors are applied in stepper motors with a small stepping angle (e.g. 6°) for clockworks, this could result in a considerable saving of space in the clockwork housing.
  • a small stepping angle e.g. 6°

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Hard Magnetic Materials (AREA)
  • Centrifugal Separators (AREA)
EP88201180A 1987-06-16 1988-06-09 Rotor multipolaire Expired - Lifetime EP0295744B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88201180T ATE73259T1 (de) 1987-06-16 1988-06-09 Mehrpoliger rotor.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL8701394A NL8701394A (nl) 1987-06-16 1987-06-16 Meerpolige rotor.
NL8701394 1987-06-16

Publications (2)

Publication Number Publication Date
EP0295744A1 true EP0295744A1 (fr) 1988-12-21
EP0295744B1 EP0295744B1 (fr) 1992-03-04

Family

ID=19850152

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88201180A Expired - Lifetime EP0295744B1 (fr) 1987-06-16 1988-06-09 Rotor multipolaire

Country Status (7)

Country Link
EP (1) EP0295744B1 (fr)
JP (1) JP2587271B2 (fr)
KR (1) KR950007949B1 (fr)
AT (1) ATE73259T1 (fr)
DE (1) DE3868705D1 (fr)
ES (1) ES2031228T3 (fr)
NL (1) NL8701394A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2641228A1 (fr) * 1988-12-29 1990-07-06 Seikosha Kk Procede et moule pour former un aimant permanent en forme de beignet
GB2237935A (en) * 1989-11-02 1991-05-15 Abrosimov Vladimir A Method of making articles from magnetically hard ferrites and a device for comminuting magnetically hard ferrites
EP3598245A1 (fr) 2018-07-20 2020-01-22 Sequent SA Montre connectée à remontage mécanique

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20010082882A (ko) * 2000-02-22 2001-08-31 강유석 수목보호판

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3840763A (en) * 1973-07-09 1974-10-08 Gen Electric Low flux density permanent magnet field configuration
EP0092422A2 (fr) * 1982-04-19 1983-10-26 Matsushita Electric Industrial Co., Ltd. Aimant permanent en alliage de Mn-Al-C et procédé de fabrication

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60211908A (ja) * 1984-04-06 1985-10-24 Seiko Epson Corp 円筒状永久磁石の製造方法
JPS60224201A (ja) * 1984-04-20 1985-11-08 Matsushita Electric Works Ltd 希土類コバルト磁石の製法
JPS60227408A (ja) * 1984-04-26 1985-11-12 Seiko Epson Corp 永久磁石の製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3840763A (en) * 1973-07-09 1974-10-08 Gen Electric Low flux density permanent magnet field configuration
EP0092422A2 (fr) * 1982-04-19 1983-10-26 Matsushita Electric Industrial Co., Ltd. Aimant permanent en alliage de Mn-Al-C et procédé de fabrication

Non-Patent Citations (9)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 259 (E-434)[2315], 4th September 1986; & JP-A-61 87 309 (MATSUSHITA ELECTRIC WORKS LTD) 02-05-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 313 (E-448)[2369], 24th October 1986; & JP-A-61 125 010 (HITACHI METALS LTD) 12-06-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 65 (E-388)[2122], 14th March 1986; & JP-A-60 214 515 (SUWA SEIKOSHA K.K.) 26-10-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 65 (E-388)[2122], 14th March 1986; & JP-A-60 216 512 (SUWA SEIKOSHA K.K.) 30-10-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 10, no. 75 (E-390)[2132], 25th March 1986; & JP-A-60 223 107 (SUWA SEIKOSHA K.K.) 07-11-1985 *
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 240 (E-529)[2687], 6th August 1987; & JP-A-62 52 913 (HITACHI METALS LTD) 07-03-1987 *
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 288, 17th September 1987, page 76 E 542; & JP-A-62 88 312 (TOHOKU METAL IND. LTD) 22-04-1987 *
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 70 (E-485)[2517], 3th March 1987; & JP-A-61 225 814 (TOSHIBA CORP.) 07-10-1986 *
PATENT ABSTRACTS OF JAPAN, vol. 8, no. 181 (E³261)[1618], 21st August 1984; & JP-A-59 72 701 (MATSUSHITA DENKI SANGYO K.K.) 24-04-1984 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2641228A1 (fr) * 1988-12-29 1990-07-06 Seikosha Kk Procede et moule pour former un aimant permanent en forme de beignet
GB2237935A (en) * 1989-11-02 1991-05-15 Abrosimov Vladimir A Method of making articles from magnetically hard ferrites and a device for comminuting magnetically hard ferrites
EP3598245A1 (fr) 2018-07-20 2020-01-22 Sequent SA Montre connectée à remontage mécanique
US11703810B2 (en) 2018-07-20 2023-07-18 Sequent SA Connected, mechanical winding watch

Also Published As

Publication number Publication date
ES2031228T3 (es) 1992-12-01
JPS6426348A (en) 1989-01-27
NL8701394A (nl) 1989-01-16
ATE73259T1 (de) 1992-03-15
KR950007949B1 (ko) 1995-07-21
EP0295744B1 (fr) 1992-03-04
KR890001120A (ko) 1989-03-18
JP2587271B2 (ja) 1997-03-05
DE3868705D1 (de) 1992-04-09

Similar Documents

Publication Publication Date Title
US4536230A (en) Anisotropic permanent magnets
US5886070A (en) Production method for anisotropic resin-bonded magnets
US5229738A (en) Multipolar rotor
US5181971A (en) Magnet and method of manufacturing the same
JPS6427208A (en) Cylindrical permanent magnet, motor using same and manufacture thereof
US3564705A (en) Method for providing oriented pole pieces in a dynamoelectric machine
JPS61112310A (ja) 永久磁石の製造方法
EP0535901A2 (fr) Aimant anisotropique à orientation latérale
US20210104361A1 (en) Bonded magnet, bonded magnet component, and bonded magnet production method
EP0295744A1 (fr) Rotor multipolaire
JP4605317B2 (ja) 希土類異方性ボンド磁石の製造方法、磁石成形体の配向処理方法および磁場中成形装置
US5004580A (en) Method and apparatus for packing permanent magnet powder
US4954800A (en) Magnet and method of manufacturing the same
JPS6312370B2 (fr)
GB2057194A (en) A method of producing a permanent anisotropic magnet
JPS5923448B2 (ja) 異方性磁石
JP3538762B2 (ja) 異方性ボンド磁石の製造方法および異方性ボンド磁石
JPH01124208A (ja) 径方向２極磁石の製造方法
JPH0661083A (ja) 径方向異方性円筒形永久磁石の製法
JPS59211502A (ja) 表面多極異方性永久磁石体の製造方法
JPH06330103A (ja) 磁性粉末成形用金型
JPS612305A (ja) Ｃ型異方性樹脂ボンド磁石の製造方法
JP3004204U (ja) 異方性磁石
JPS6344285B2 (fr)
JPH0628214B2 (ja) ボンド磁石の製造方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

17P Request for examination filed

Effective date: 19881125

17Q First examination report despatched

Effective date: 19901214

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB GR IT LI LU NL SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Effective date: 19920304

Ref country code: BE

Effective date: 19920304

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 19920304

Ref country code: SE

Effective date: 19920304

REF Corresponds to:

Ref document number: 73259

Country of ref document: AT

Date of ref document: 19920315

Kind code of ref document: T

REF Corresponds to:

Ref document number: 3868705

Country of ref document: DE

Date of ref document: 19920409

ITF It: translation for a ep patent filed
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19920630

ET Fr: translation filed
REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2031228

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
REG Reference to a national code

Ref country code: CH

Ref legal event code: PK

REG Reference to a national code

Ref country code: GB

Ref legal event code: 713B

REG Reference to a national code

Ref country code: FR

Ref legal event code: RM

REG Reference to a national code

Ref country code: GB

Ref legal event code: 7131

Ref country code: GB

Ref legal event code: 713F

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20010606

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: ES

Payment date: 20010619

Year of fee payment: 14

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020609

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020610

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20020609

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20030711

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20070607

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20070629

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20070823

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20070627

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20070628

Year of fee payment: 20

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

NLV7 Nl: ceased due to reaching the maximum lifetime of a patent

Effective date: 20080609

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20080609