EP0174322B1 - Dispositif d'aimantation multipolaire - Google Patents

Dispositif d'aimantation multipolaire Download PDF

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Publication number
EP0174322B1
EP0174322B1 EP85900966A EP85900966A EP0174322B1 EP 0174322 B1 EP0174322 B1 EP 0174322B1 EP 85900966 A EP85900966 A EP 85900966A EP 85900966 A EP85900966 A EP 85900966A EP 0174322 B1 EP0174322 B1 EP 0174322B1
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EP
European Patent Office
Prior art keywords
portions
conductors
magnetization
conductor
groups
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.)
Expired
Application number
EP85900966A
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German (de)
English (en)
French (fr)
Other versions
EP0174322A1 (fr
Inventor
Claude Oudet
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.)
Portescap SA
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Portescap SA
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Publication date
Application filed by Portescap SA filed Critical Portescap SA
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    • 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
    • H01F13/003—Methods and devices for magnetising permanent magnets

Definitions

  • the present invention relates to a multipolar supply device for forming, on at least one surface of a magnetizable body, a series of magnetized zones, having successively alternating polarities, comprising at least one source of electrical energy, at least one device current pulse generator connected to this source, and several portions of elongated electrical conductors, connected to said pulse generator device and arranged so as to create magnetic fields producing the magnetization of said zones, device in which said portions of conductors are arranged so that the magnetization of each zone is produced by the magnetic field generated by at least four portions of conductors and so that at least a portion of the portions of conductors connected to the pulse generator device forms a group at inside which these portions are connected together in series.
  • Such a device is described, for example, in the document JP-A-575,313, which shows the usual arrangement consisting in supplying the conductors from a single current pulse generator, the voltage of which must be sufficiently high. to create the necessary magnetization current.
  • Devices of this type generally have major drawbacks, in particular when it comes to producing on a body of small dimensions, such as a stepper motor rotor, a large number of magnetized zones. , for example in order to achieve, in the case of such an engine, a high number of steps.
  • the number of zones to be magnetized increases for a given volume or surface of the corresponding body, the usable copper section and the space available for the insulation of the conductors are reduced accordingly. It follows, on the one hand, that the problem of the heating of the device quickly becomes critical, and that, on the other hand, the admissible working voltage decreases due to the risk of breakdown.
  • the homogeneity of the magnetization of the different zones is not satisfactory.
  • the portions of conductors producing the respective magnetization fields in practice always have variations in section, therefore of electrical resistance, and thus conduct different magnetization currents.
  • the usual supply, in parallel, of the conductors or groups of conductors does not ensure sufficient homogeneity from the moment when it is no longer possible, in particular for reasons of heating, to saturate the zones to be magnetized by excess current.
  • An additional drawback stems from the fact that the usual power supply makes fault detection due to breakdown very difficult, the corresponding variations in current level being very small.
  • the portions of conductors which produce the magnetization of the different zones form two groups connected in parallel to a pulse generator device, these groups each acting on the whole areas to be magnetized.
  • the working voltage and the maximum magnetization current are limited accordingly, in accordance with the considerations mentioned above on this subject. , which is a major drawback.
  • this device has the drawback of having loops of imperfect conductors around the zones to be magnetized at the point of entry and exit of the conductors for connection to the pulse generator device. This leads to a significant difference in the magnetization of these zones compared to the other zones and, consequently, to an asymmetry compared to the center or a symmetry compared to only one axis of the magnetized part, which is not desirable in most applications.
  • the object of the invention is to remedy the defects and limitations of known magnetization devices, and in particular to provide a device of the type mentioned at the start which makes it possible to magnetize a large number of zones over a reduced space, in a very homogeneous manner. .
  • the device according to the invention is characterized in that it comprises several groups of portions of conductors each acting on part of all of the zones to be magnetized, that the groups are each connected to a device generating respective pulses producing substantially equal current pulses, and the groups are nested relative to each other so that the magnetization of each zone is produced by portions of conductors respectively connected to at least two generating devices d 'separate pulses.
  • the groups are offset from one another in the direction in which the magnetized zones succeed one another.
  • FIG. 1 is a diagram of the arrangement and of the supply of the electrical conductors of the magnetization device
  • FIG. 2 is a diagrammatic cross-section view along line II - II of FIG. 1, showing the magnetization of an area of the body to be magnetized, and
  • Figure 3 is a cross-sectional view of the device in working condition.
  • the device illustrated in Figures 1 to 3 is intended for the magnetization of a multipolar stepper motor rotor which is in the form of the annular disc 1 partially visible in section in Figure 2.
  • Elongated conductor portions such that 21 to 28, designated as a whole by 2 in FIG. 1, are arranged parallel to the disc in the radial direction of the latter so as to produce in the circumferential direction of the disc a series of magnetized zones in the transverse direction, c ' that is to say in the axial direction of the disc.
  • the magnetization device comprises two annular support parts 5, 51, made of a highly permeable material, such as an iron-cobalt alloy, between which is placed the magnetizing disc 1, flat, of small thickness compared to its diameter. and made for example in samarium-cobalt.
  • the support parts 5, 51 have respective plane polar surfaces opposite the disk 1 and each comprise a series of radial slots such as 3 and 4 in which the portions of corresponding electrical conductors are housed. These conductors are arranged and connected to sources. electric current as described below in relation to Figure 1.
  • Figure 1 shows the support part 5 in plan, the outer and inner edges of its annular surface defining the magnetized surface on the rotor disc.
  • this surface is constituted by a series of elongated zones, oriented radially, and having alternating polarities on each face of the disc.
  • FIG. 1 The section along line II - II of Figure 1 is shown in Figure 2.
  • Each of the adjacent slots 3,4 has a pair of conductor portions 21, 22 and 23, 24 respectively.
  • a similar arrangement of the support part 51 and of conductor portions 25, 26 and 27, 28 is placed opposite the first so as to form a gap 6 in which the disk 1 to be magnetized is arranged.
  • the ends of the radial conductor portions are connected as shown in FIG. 1 so as to form groups of conductor portions connected in series, the ends of each of these groups being connected to the terminals of a respective pulse generator device. not shown.
  • the ends of the different groups associated with part 5 have been designated respectively by E 1 ' 5 1 ; E 2 , S 2 ; E3, Ss; ...; E lo , S 10 .
  • Each group has twenty portions of conductors and the support has a total of one hundred slots such as 3 or 4.
  • the different groups are offset with respect to each other so that in each slot are housed portions of conductors belonging to two different groups, these portions being connected to be traversed in the same direction by the magnetization current.
  • the groups overlap by half their angular extent.
  • the conductors of the opposite part 51 are arranged in a similar manner, an additional offset for example of a quarter of their angular extent being preferably provided between the respective groups of the two support parts arranged opposite.
  • the various pulse generating devices are arranged to supply current pulses of the same amplitude and the same duration.
  • they essentially comprise a capacitor, a load resistor connected in series and a switch device arranged to connect the capacitor for a determined period of time at the terminals of the group of corresponding portions of conductors.
  • the capacitor is preferably charged from an energy source common to all of the pulse generating devices.
  • each pair of portions of conductors is traversed by a current of the same direction coming from two different pulse generators.
  • Each conductor portion of a pair is connected in series with a conductor portion housed in the adjacent slot of the same support part so that the currents flowing in the conductor portions housed in adjacent slots are in opposite directions.
  • the currents flowing in pairs of portions of conductors housed in slots arranged opposite one another are directed in the same direction.
  • zone 11 of the disc 1 has for example the direction indicated in this figure by the arrows and, consequently, the magnetization of a zone 11 of the disc 1, delimited by dotted lines, is carried out in the transverse direction of the disc by revealing poles of opposite names on each of its surfaces. It also appears from FIG. 2 that the zones adjacent to the zone 11 on each side of the latter, that is to say the zones 12 and 13 partially visible, are magnetized parallel but in the opposite direction with respect to the magnetization of zone 11.
  • each zone is produced by currents flowing in several portions of conductors, eight in the present example corresponding to at least two, here four, groups supplied respectively from separate pulse-generating devices, the influence of the difference between the currents becomes negligible, so that excellent homogeneity magnetization from one zone to another can be achieved.
  • the arrangement according to FIG. 1 also has the advantage that the external connections between the different portions of conductors are made so that a closed loop is formed around each zone to be magnetized, parallel to the corresponding surface of the disc to be magnetized. This allows a particularly efficient use of the magnetization current.
  • the groups of overlapping portions of conductors are oriented in the opposite direction with respect to their connections to the respective pulse generator devices.
  • group E 6 S 6 for example, the current flows in a peripheral direction in the clockwise direction
  • groups E 2 , S 2 , and E 3 , S 3 which cooperate with this group Eg , Se, the current in the peripheral direction flows in the opposite direction.
  • the connections to the pulse generating devices are only shown diagrammatically in FIG. 3 but it is obvious that in this case also the loop can be easily closed by an appropriate configuration of the conductors as shown for example at the connections S 3 , E4.
  • the portions of elongated conductors are arranged in the slots so that their outer edges are at least approximately the same height as the edge of the slot.
  • FIG. 3 shows, in axial section, a practical embodiment of the present magnetization device.
  • the annular support parts 5 and 51 provided with slots such as 3 for the magnetization current conductors.
  • the conductors themselves are not visible, the parts surrounding the supports being embedded in a plastic material, forming parts 52, 53, 54, 55.
  • each of the support parts 5 and 51 is integral with a respective assembly 31, 32, these assemblies being axially separable to allow the positioning of the part to be magnetized 1, and are placed in the position of FIG. 3 during the magnetization operation of the device.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
EP85900966A 1984-02-22 1985-02-22 Dispositif d'aimantation multipolaire Expired EP0174322B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH850/84 1984-02-22
CH85084 1984-02-22

Publications (2)

Publication Number Publication Date
EP0174322A1 EP0174322A1 (fr) 1986-03-19
EP0174322B1 true EP0174322B1 (fr) 1989-01-04

Family

ID=4196662

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85900966A Expired EP0174322B1 (fr) 1984-02-22 1985-02-22 Dispositif d'aimantation multipolaire

Country Status (7)

Country Link
US (1) US4737753A (enrdf_load_stackoverflow)
EP (1) EP0174322B1 (enrdf_load_stackoverflow)
JP (1) JPS61501734A (enrdf_load_stackoverflow)
KR (1) KR920010842B1 (enrdf_load_stackoverflow)
DE (1) DE3567311D1 (enrdf_load_stackoverflow)
FR (1) FR2559945B1 (enrdf_load_stackoverflow)
WO (1) WO1985003801A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239491A1 (de) * 1992-04-02 1993-10-07 Steingroever Magnet Physik Magnetisiervorrichtung für stirnseitig bipolare oder auf den Seitenflächen multipolare Dauermagnetringe

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5025240A (en) 1989-08-30 1991-06-18 The Torrington Company Method and apparatus for forming magnetized zones on a magnetizable body
GB2243023B (en) * 1990-04-14 1994-08-03 Vacuumschmelze Gmbh A multipolar magnetizing device
US5063367A (en) * 1990-09-04 1991-11-05 Eastman Kodak Company Method and apparatus for producing complex magnetization patterns in hard magnetic materials
US5168187A (en) * 1991-02-20 1992-12-01 Dana Corporation, Warner Electric Brake & Clutch Division Axial pole stepping motor
US5959382A (en) * 1995-10-13 1999-09-28 Milli Sensor Systems And Actuators, Inc. Magnetic actuator and position control system
US6556115B1 (en) 1999-12-17 2003-04-29 Seagate Technology Llc Assembly apparatus for magnetizing magnets
US6467157B1 (en) * 2000-01-26 2002-10-22 Odin Technologies, Ltd. Apparatus for construction of annular segmented permanent magnet
EP1612563A3 (en) * 2001-09-11 2009-12-09 JTEKT Corporation Magnetic pulser ring
JP3904937B2 (ja) * 2002-02-08 2007-04-11 株式会社ミツバ モータ組立装置

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1260695A (fr) * 1960-03-30 1961-05-12 Normacem Sa Procédé de fabrication de machines électriques tournantes
US3158797A (en) * 1961-10-31 1964-11-24 Stackpole Carbon Co Device for magnetizing circular magnets
NL266555A (enrdf_load_stackoverflow) * 1962-06-29
GB1117022A (en) * 1965-06-23 1968-06-12 Gen Electric Co Ltd Improvements in or relating to arrangements for producing magnetic fields using superconducting magnets
DE1489805A1 (de) * 1965-07-20 1969-04-03 Deutsche Edelstahlwerke Ag Vorrichtung und Schaltungsanordnung zur vielpoligen streifenfoermigen Wechselmagnetisierung eines Zylindermagneten
FR1512239A (fr) * 1967-02-23 1968-02-02 Procédé de fabrication d'aimants permanents
US3624572A (en) * 1970-04-30 1971-11-30 Ampex Magnets for generating spatially varying magnetic fields
FR2212889A5 (enrdf_load_stackoverflow) * 1972-08-23 1974-07-26 Europ Propulsion
US3824516A (en) * 1973-02-05 1974-07-16 S Benowitz Electromagnetic material handling system utilizing offset pole spacing
US4169998A (en) * 1977-10-03 1979-10-02 Hitachi Metals, Ltd. Iron core assembly for magnetizing columnar permanent magnets for use in electrostatic developing apparatus
JPS5482099A (en) * 1977-12-13 1979-06-29 Matsushita Electric Ind Co Ltd Anisotropic magnet manufacturing process
JPS5814055B2 (ja) * 1980-03-03 1983-03-17 日本電信電話株式会社 着磁装置
JPS575313A (en) * 1980-06-12 1982-01-12 Matsushita Electric Ind Co Ltd Magnetizing method for magnet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4239491A1 (de) * 1992-04-02 1993-10-07 Steingroever Magnet Physik Magnetisiervorrichtung für stirnseitig bipolare oder auf den Seitenflächen multipolare Dauermagnetringe

Also Published As

Publication number Publication date
KR850700286A (ko) 1985-12-26
FR2559945A1 (fr) 1985-08-23
EP0174322A1 (fr) 1986-03-19
FR2559945B1 (fr) 1988-08-19
KR920010842B1 (ko) 1992-12-19
JPS6343882B2 (enrdf_load_stackoverflow) 1988-09-01
DE3567311D1 (de) 1989-02-09
WO1985003801A1 (fr) 1985-08-29
JPS61501734A (ja) 1986-08-14
US4737753A (en) 1988-04-12

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