EP1240652A1 - Verfahren zur herstellung stabförmiger dauermagnete - Google Patents
Verfahren zur herstellung stabförmiger dauermagneteInfo
- Publication number
- EP1240652A1 EP1240652A1 EP00985202A EP00985202A EP1240652A1 EP 1240652 A1 EP1240652 A1 EP 1240652A1 EP 00985202 A EP00985202 A EP 00985202A EP 00985202 A EP00985202 A EP 00985202A EP 1240652 A1 EP1240652 A1 EP 1240652A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pressed parts
- permanent magnets
- pressed
- parts
- rare earth
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/06—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/02—Permanent magnets [PM]
- H01F7/0205—Magnetic circuits with PM in general
- H01F7/021—Construction of PM
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/49009—Dynamoelectric machine
- Y10T29/49012—Rotor
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/49—Method of mechanical manufacture
- Y10T29/49002—Electrical device making
- Y10T29/4902—Electromagnet, transformer or inductor
- Y10T29/49075—Electromagnet, transformer or inductor including permanent magnet or core
Definitions
- the invention relates to a method for producing permanent magnets, in particular rod-shaped permanent magnets.
- Permanent magnets of this type are required for motors and generators. They typically have a diameter between 10 and 50 mm and a length between 20 and 200 mm.
- the preferred magnetic direction of these permanent magnets can run in the axial or diametrical direction.
- the conventional production of these magnets, preferably with a diametrical preferred direction, has so far required a great deal of effort.
- tablet-shaped pressed parts with a diameter to length ratio close to 1 can be pressed particularly well.
- the permanent magnets made from these green compacts are first ground.
- the permanent magnets are then glued together so that their preferred magnetic direction points in the same direction.
- the required surface grinding, alignment and gluing of the permanent magnets lead to high labor costs.
- the alignment of the permanent magnets requires a lot of work or complex devices.
- the object of the invention is to create a method with which, in particular, rod-shaped permanent magnets can be produced in a simple and inexpensive manner.
- FIG. 1 shows a perspective view of a rod-shaped permanent magnet produced using the method according to the invention
- Figure 2 is a plan view of a pressed part that can be assembled into a rod-shaped permanent magnet
- Figure 3 shows a cross section through a further pressed part
- Figure 4 shows a cross section through a further modified pressed part.
- Figure 1 shows a rod-shaped permanent magnet 1, which is assembled from several pressed parts 2.
- Permanent magnets 1 of this type are required for motors and generators and typically have a diameter between 10 and 50 mm and a length between 20 and 200 mm.
- the permanent magnets 1 have either an axial magnetic preferred direction 3 or a diametrical magnetic preferred direction 4.
- the pressed parts 2 have elevations 6 on an upper side 5. If the pressed parts 2 have a diametrical magnetic preferred direction 4, the elevations 6 are preferably designed such that the diametrical magnetic preferred direction 4 of the pressed parts 2 m has the same direction when the pressed parts 2 are placed one on top of the other.
- Figures 3 and 4 show cross sections through possible embodiments of the pressed parts 2. It can be clearly seen that in addition to the elevation 6 on the top 5 on an underside 7, a recess 8 complementary to the elevation 6 is formed, so that the pressed parts 2 can be assembled seamlessly , The elevation 6 and the depression 8 are preferred conical to allow a trouble-free joining of the pressed parts 2. The dimensions of the depressions 8 and elevations 6 are chosen so that there is a joint gap of usually 0.05 mm.
- a rare earth-containing alloy is generally first melted and then pulverized. Pressed parts are pressed from the powder. To set a preferred magnetic direction, the pressing process takes place in the presence of an external magnetic field. Then the pressed parts 2 are joined and sintered at temperatures above 800 ° C. In the case of permanent magnets based on Nd-Fe-B, a liquid phase forms along the top 5 and bottom 7, which connects the pressed parts 2 in the solidified state. In everyone
- the individual parts will be connected to each other, provided there is good contact between the compacts.
- the magnetic adhesive force then holds the pressed parts 2 together when handling and in the sintering furnace up to the Curie temperature.
- Pressed parts 2 with a diametrical magnetic preferred direction are preferably stacked on top of one another with mutual polarity.
- a particularly good joint can be achieved with the aid of gravity if the stacked rod-shaped permanent magnet 1 is sintered upright.
- the permanent magnet 1 can be sintered with known liquid plastics, such as e.g. B. methacrylate vacuum or pressure impregnated.
- the plastic fills any pores and gaps and hardens after the permanent magnet 1 has been soaked with the plastic.
- the permanent magnet 1 Compared to rod-shaped permanent magnets that have been produced by gluing finished sintered individual parts, the permanent magnet 1 has a significantly higher strength, since the pressed parts 2 form a uniformly solid body after sintering.
- the method is cost-effective since the pressed parts 2 are positioned by the appropriately designed elevations 6 and depressions 8 and the surface grinding of the upper side 5 and the lower side 7, which is necessary for a good adhesive bond, is eliminated. On the contrary, it is even advantageous for a firm sintered connection if the upper side 5 and the lower side 7 are roughened.
- the pressed parts 2 are pressed individually, a tool with dimensions m of the order of magnitude of the dimensions of the pressed parts 2 is sufficient for pressing the pressed parts 2.
- the magnetic field can be kept homogeneous with little effort.
- the permanent magnets 1 are therefore considerably more homogeneous in magnetic terms.
- permanent magnets 1 can be produced with almost any ratio of diameter to length using the method described here.
- Rare earths, iron and boron have proven to be particularly advantageous to set the amount of liquid sintering phase, ie the content of rare earths in the alloy, somewhat higher than normal, about 1 to 5% by weight more rare earths.
- the invention will now be explained in more detail using the following examples:
- Nd-Fe-B powder is pressed in a magnetic field to round discs with a diameter of 22 mm and a height of 10 mm using a pressure of 250 MPa.
- Four blanks are stacked on top of each other to form a green compact and sintered standing at 1 hour at 1100 ° C in a vacuum. After sintering, however, 60% of the finished textiles were not connected. The rest of the body could be easily separated with one blow.
- the present description of the method is exemplary; in particular, the joining of the pressed parts 2 should not be limited to rod-shaped magnets.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
- Hard Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19962232 | 1999-12-22 | ||
DE19962232A DE19962232B4 (de) | 1999-12-22 | 1999-12-22 | Verfahren zur Herstellung stabförmiger Dauermagnete |
PCT/EP2000/012958 WO2001046969A1 (de) | 1999-12-22 | 2000-12-19 | Verfahren zur herstellung stabförmiger dauermagnete |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1240652A1 true EP1240652A1 (de) | 2002-09-18 |
EP1240652B1 EP1240652B1 (de) | 2004-03-17 |
Family
ID=7933952
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00985202A Expired - Lifetime EP1240652B1 (de) | 1999-12-22 | 2000-12-19 | Verfahren zur herstellung stabförmiger dauermagnete |
Country Status (5)
Country | Link |
---|---|
US (1) | US6926777B2 (de) |
EP (1) | EP1240652B1 (de) |
JP (1) | JP2003518331A (de) |
DE (2) | DE19962232B4 (de) |
WO (1) | WO2001046969A1 (de) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003021742A1 (fr) * | 2001-09-03 | 2003-03-13 | Hitachi Powdered Metals Co.,Ltd. | Rotor de type a aimant permanent et procede de fabrication du rotor |
TWI250536B (en) | 2003-02-27 | 2006-03-01 | Mitsubishi Electric Corp | Ring-shaped magnet and manufacturing method thereof |
WO2011158710A1 (ja) * | 2010-06-17 | 2011-12-22 | 日産自動車株式会社 | 回転電機に配設される永久磁石の製造装置およびその製造方法 |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3892598A (en) * | 1974-01-07 | 1975-07-01 | Gen Electric | Cobalt-rare earth magnets comprising sintered products bonded with solid cobalt-rare earth bonding agents |
US3887395A (en) * | 1974-01-07 | 1975-06-03 | Gen Electric | Cobalt-rare earth magnets comprising sintered products bonded with cobalt-rare earth bonding agents |
US4289549A (en) * | 1978-10-31 | 1981-09-15 | Kabushiki Kaisha Suwa Seikosha | Resin bonded permanent magnet composition |
DE7836712U1 (de) * | 1978-12-12 | 1979-06-28 | Walter Hebel Gmbh & Co, 5242 Kirchen | Magnete zum anheften von anschauungsmaterial und zu organisationszwecken |
DE7903999U1 (de) * | 1979-02-14 | 1979-06-28 | Walter Hebel Gmbh & Co, 5242 Kirchen | Magnete mit kappen zum anheften von anschauungsmaterial und zu organisationszwecken usw. |
DE3047701A1 (de) * | 1980-12-18 | 1982-07-15 | Magnetfabrik Bonn Gmbh Vorm. Gewerkschaft Windhorst, 5300 Bonn | Verfahren zum herstellen von anisotropen dauermagneten und danach hergestellte rohrfoermige dauermagnete |
FR2526994B1 (fr) * | 1982-05-11 | 1987-03-06 | Draper Lab Charles S | Procede et appareillage pour produire des aimants cobalt-terre rare en anneau a orientation radiale du champ magnetique et aimant permanent ainsi obtenu |
CA1277159C (en) * | 1983-05-06 | 1990-12-04 | Setsuo Fujimura | Isotropic permanent magnets and process for producing same |
EP0248665B1 (de) * | 1986-06-06 | 1994-05-18 | Seiko Instruments Inc. | Seltene Erden-Eisenmagnet und Herstellungsverfahren |
US4859410A (en) * | 1988-03-24 | 1989-08-22 | General Motors Corporation | Die-upset manufacture to produce high volume fractions of RE-Fe-B type magnetically aligned material |
US5049053A (en) * | 1988-08-18 | 1991-09-17 | Hitachi Metals, Ltd. | Metal mold for molding anisotropic permanent magnets |
SE9001409D0 (sv) * | 1990-04-20 | 1990-04-20 | Sandvik Ab | Metod foer framstaellning av haardmetallkropp foer bergborrverktyg och slitdelar |
DE4117104A1 (de) | 1991-05-25 | 1992-11-26 | Vacuumschmelze Gmbh | Verfahren zur herstellung eines stickstoffhaltigen dauermagneten, insbesondere sm-fe-n |
US5382303A (en) * | 1992-04-13 | 1995-01-17 | Sps Technologies, Inc. | Permanent magnets and methods for their fabrication |
US5641363A (en) * | 1993-12-27 | 1997-06-24 | Tdk Corporation | Sintered magnet and method for making |
JP3132393B2 (ja) * | 1996-08-09 | 2001-02-05 | 日立金属株式会社 | R−Fe−B系ラジアル異方性焼結リング磁石の製造方法 |
DE19912470B4 (de) * | 1999-03-19 | 2005-06-02 | Vacuumschmelze Gmbh | Verbundteil und Verfahren zu dessen Herstellung |
-
1999
- 1999-12-22 DE DE19962232A patent/DE19962232B4/de not_active Expired - Fee Related
-
2000
- 2000-12-19 EP EP00985202A patent/EP1240652B1/de not_active Expired - Lifetime
- 2000-12-19 US US10/129,559 patent/US6926777B2/en not_active Expired - Fee Related
- 2000-12-19 DE DE50005736T patent/DE50005736D1/de not_active Expired - Fee Related
- 2000-12-19 JP JP2001547408A patent/JP2003518331A/ja active Pending
- 2000-12-19 WO PCT/EP2000/012958 patent/WO2001046969A1/de active IP Right Grant
Non-Patent Citations (1)
Title |
---|
See references of WO0146969A1 * |
Also Published As
Publication number | Publication date |
---|---|
DE50005736D1 (de) | 2004-04-22 |
DE19962232A1 (de) | 2001-07-12 |
DE19962232B4 (de) | 2006-05-04 |
JP2003518331A (ja) | 2003-06-03 |
US20030110617A1 (en) | 2003-06-19 |
WO2001046969A1 (de) | 2001-06-28 |
EP1240652B1 (de) | 2004-03-17 |
US6926777B2 (en) | 2005-08-09 |
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