WO2015072328A1 - Dispositif de génération de champ magnétique et moteur linéaire - Google Patents

Dispositif de génération de champ magnétique et moteur linéaire Download PDF

Info

Publication number
WO2015072328A1
WO2015072328A1 PCT/JP2014/078640 JP2014078640W WO2015072328A1 WO 2015072328 A1 WO2015072328 A1 WO 2015072328A1 JP 2014078640 W JP2014078640 W JP 2014078640W WO 2015072328 A1 WO2015072328 A1 WO 2015072328A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnetic field
field generator
magnet
main
pole
Prior art date
Application number
PCT/JP2014/078640
Other languages
English (en)
Japanese (ja)
Inventor
弘光 大橋
Original Assignee
日立金属株式会社
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 日立金属株式会社 filed Critical 日立金属株式会社
Priority to JP2015547722A priority Critical patent/JPWO2015072328A1/ja
Publication of WO2015072328A1 publication Critical patent/WO2015072328A1/fr

Links

Images

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/03—Synchronous motors; Motors moving step by step; Reluctance motors
    • H02K41/031—Synchronous motors; Motors moving step by step; Reluctance motors of the permanent magnet type

Definitions

  • the present invention relates to a magnetic field generator using a rare earth magnet, and a linear motor configured using the same.
  • a linear motor is a motor in which a coil is arranged in a magnetic field generated by a magnetic field generator, and the magnetic field generator and the coil are relatively moved by energization control of the coil.
  • the magnetic field generation device is configured by arranging a plurality of magnets in parallel so that the magnetization directions of adjacent magnets are opposite to each other in a pair of yokes arranged to face each other with a magnetic field generation space therebetween.
  • a magnet having a high residual magnetic flux density Br such as a rare earth iron boron-based magnet
  • the magnetic field generator described in Patent Document 1 employs a magnet array called a Halbach array.
  • the Halbach array is a magnet having a magnetization direction (main pole) perpendicular to the main surface facing the magnetic field generation space at a predetermined interval, and a magnet having a magnetization direction parallel to the main surface between the main poles ( It is an arrangement that interposes a complementary pole).
  • the auxiliary poles are arranged with their respective magnetization directions facing the main poles whose main magnetization direction is toward the main surface (the main pole whose main surface side is the N pole).
  • the magnetic field formed at the opposing portion of the main pole is strengthened by the action of the auxiliary pole, and a magnetic field having a high magnetic flux density can be formed.
  • the demagnetizing field at the boundary between adjacent main and auxiliary poles with different magnetization directions increases, causing irreversible demagnetization due to the effect of thermal demagnetization accompanying temperature rise in the usage environment, and the magnetic flux density over time There is a problem that it decreases.
  • Patent Document 1 discloses that a high coercive force having a high coercive force by diffusion of heavy rare earth (Dy: dysprosium, Tb: terbium, etc.) at least in the vicinity of the main surface of the boundary surface with the main electrode of the complementary electrode.
  • a magnetic layer is disclosed.
  • a third magnet having a magnetization direction inclined with respect to the main surface is interposed between the main pole (first magnet) and the auxiliary electrode (second magnet), and the vicinity of the main surface of the boundary surface of each magnet
  • the formation of the above-described high coercive force layer is also disclosed.
  • Patent Document 2 magnets having an orientation direction inclined with respect to the main surface are fixed on both sides of the magnet having an orientation direction orthogonal to the main surface so that the main surfaces are aligned.
  • a magnet unit that is magnetized in a magnetic field that matches the direction is disclosed.
  • This magnet unit can be used as a unit in which the first magnet and the third magnet constituting the main pole are integrated in advance in the magnetic field generator described in Patent Document 1.
  • the directions of magnetization of adjacent magnet units are away from each other, the occurrence of a short circuit in the magnetic path can be suppressed, the magnetic flux density in the magnetic field generation space can be increased, and the magnetic field generator can be made compact and lightweight. It is possible to correspond to
  • the heavy rare earth for forming the high coercive force layer is a rare and expensive material, and the formation of the high coercive force layer at each position described above causes an increase in product cost. Furthermore, in a magnetic field generator using a large magnet, the necessary thickness for diffusing heavy rare earths becomes large, and there is a limit to the increase in coercive force due to the formation of a high coercive force layer.
  • the magnet unit described in Patent Document 2 integrates the first magnet and the third magnet constituting the main pole before magnetization, it can reduce the labor of the fixing operation described above. Since the magnetization direction changes suddenly between the center magnet and the magnets on both sides, the demagnetizing field increases at the boundary of each magnet, which is irreversible within the magnet unit due to the effect of thermal demagnetization in the operating environment. There is a risk of demagnetization.
  • Patent Document 2 two types of magnets having different residual magnetic flux density Br and coercive force Hcj are used.
  • a magnet having a relatively small residual magnetic flux density and a large coercive force is disposed on the yoke side, and the residual magnetic flux density is large and the coercive force is large.
  • a magnetic field generator is configured to reduce demagnetizing fields by arranging small magnets on the magnetic field generating space side.
  • this magnetic field generator requires two types of magnets, and the configuration is complicated, and there is a limit to the improvement of the magnetic flux density in the magnetic field generation space by using a magnet with a small Br.
  • the present invention has been made in view of such circumstances, and a magnetic field generator having a simple configuration capable of suppressing the occurrence of thermal demagnetization and obtaining as high a magnetic flux density as possible in a magnetic field generation space.
  • An object of the present invention is to provide a linear motor that can obtain a high output by using this magnetic field generator.
  • the magnetic field generator according to the present invention alternately arranges a plurality of main poles and a plurality of complementary poles on one surface of a pair of yokes facing each other across a magnetic field generation space, with the main surfaces facing the magnetic field generation space being aligned.
  • the main pole is orthogonal to the main surface at the center position in the juxtaposition direction.
  • a concentrated orientation magnet having a magnetization direction that continuously reduces an inclination angle with respect to the main surface on both sides of the central position, the main poles adjacent to each other are arranged in reverse to each other, and the complementary pole is
  • the magnet has a magnetization direction parallel to the main surface, and is arranged with the respective magnetization directions directed to the main pole magnetized toward the main surface.
  • a concentrated orienting magnet whose magnetization direction is continuously changed and concentrated at the center of the main surface is used as a main pole, and this main pole and an auxiliary pole having a magnetization direction parallel to the main surface are used as a yoke.
  • a magnetic field generator is configured by arranging Halbach on one surface. The magnetization direction of the main pole changes continuously, and there is no sudden change portion of the magnetization direction inside the main pole. Therefore, the increase in the demagnetizing field inside the main pole can be suppressed and the occurrence of irreversible demagnetization due to the effect of thermal demagnetization can be suppressed. Therefore, it is possible to realize as high a magnetic flux density as possible.
  • the magnetic field generator according to the present invention is characterized in that the cross-sectional shape of the main pole and the auxiliary pole is a rectangular shape having a substantially constant width in the juxtaposition direction.
  • a magnetic field generator is configured by arranging a main pole and a complementary pole having a rectangular shape with a constant width in parallel.
  • the rectangular main electrode and auxiliary electrode can be easily formed and configured with high accuracy.
  • the width of the auxiliary poles arranged side by side is longer on the opposite side of the yoke than the side of the yoke, and the width of the main poles arranged side by side is The side of the yoke is longer than the opposite side of the yoke.
  • the width of the auxiliary pole on the side facing the magnetic field generation space where demagnetization is likely to occur is large, the length of the magnet in the magnetization direction is increased, and the occurrence of demagnetization can be suppressed.
  • the magnetic field generator according to the present invention is characterized in that the cross-sectional shape of the main pole is an isosceles trapezoid and the cross-sectional shape of the complementary electrode is a triangle.
  • the magnetic field generator according to the present invention is characterized in that one or both of the main pole and the auxiliary pole have a high coercive force layer formed on the boundary surface between them.
  • the high coercive force layer is provided at the boundary portion between the main pole and the auxiliary pole where the change in the magnetization direction is large, the influence of thermal demagnetization at the portion can be reduced and the occurrence of irreversible demagnetization can be suppressed.
  • the high coercive force layer may be provided only between the main pole and the auxiliary pole, and the increase in product cost is small.
  • a plurality of main poles and a plurality of complementary poles are respectively directed to the magnetic field generation space on one surface of a pair of non-magnetic holding bodies facing each other with a magnetic field generation space therebetween.
  • the main poles being at the center position in the side-by-side direction
  • the auxiliary pole is a magnet having a magnetization direction parallel to the main surface, and is arranged with the respective magnetization directions directed to the main pole magnetized toward the main surface.
  • a concentrated orienting magnet whose magnetization direction changes continuously and concentrates in the center of the main surface is used as a main pole, and this main pole and an auxiliary pole having a magnetization direction parallel to the main surface are not used.
  • a magnetic field generator is configured by arranging Halbach on one surface of a magnetic holder. The magnetization direction of the main pole changes continuously, and there is no sudden change portion of the magnetization direction inside the main pole. Therefore, the increase in the demagnetizing field inside the main pole can be suppressed and the occurrence of irreversible demagnetization due to the effect of thermal demagnetization can be suppressed. Therefore, it is possible to realize as high a magnetic flux density as possible.
  • a lightweight material such as aluminum or CFRP (carbon fiber reinforced plastic) can be used, and the weight of the magnetic field generator can be reduced.
  • a linear motor is configured by arranging a coil in the magnetic field generated by the magnetic field generator.
  • the magnetic field generator can form a magnetic field having a high magnetic flux density without being affected by thermal demagnetization, and can stably realize a high output operation in various environments.
  • the magnetic field generator according to the present invention is characterized in that the plurality of magnets have a rectangular cross section with a substantially constant width in the juxtaposition direction.
  • a magnetic field generator is configured by arranging parallel rectangular magnets having a certain width. Rectangular magnets are easy to mold and can be constructed with high precision
  • the magnetic field generator according to the present invention is characterized in that the plurality of magnets are separated from each other.
  • adjacent magnets are separated from each other, and the parallel arrangement interval of the magnets can be appropriately adjusted by increasing or decreasing the separation amount.
  • the magnetic field generator according to the present invention is characterized in that the plurality of magnets are adjacent to each other.
  • the magnetic field generator according to the present invention is characterized in that the magnet has a cross-sectional shape that is wide on the side of the yoke and narrow on the side of the main surface.
  • the interval between adjacent magnets can be increased, and the short circuit of the magnetic path between the magnets can be further reduced, and the magnetic field can be reduced. It is possible to realize as high a magnetic flux density as possible in the generation space.
  • the magnetic field generator according to the present invention is characterized in that the plurality of magnets are separated from each other on the yoke side.
  • adjacent magnets are separated from each other, and the parallel arrangement interval of the magnets can be appropriately adjusted by increasing or decreasing the separation amount.
  • the magnetic field generator according to the present invention is characterized in that the plurality of magnets are adjacent to each other on the yoke side.
  • adjacent magnets are adjacent to each other, and the magnetic flux density in the magnetic field generation space can be further increased.
  • the magnetic field generator according to the present invention is characterized in that the sectional shape of the magnet is an isosceles trapezoid.
  • the sectional shape of the magnet is an isosceles trapezoid, the magnetization direction can be concentrated well in the center, and a relatively uniform magnetic flux density waveform can be realized in the magnetic field generation space.
  • the magnetic field generator according to the present invention is characterized in that the plurality of magnets have high coercive force layers formed on side surfaces on both sides in the side-by-side direction.
  • the corner of the magnet is a part where the demagnetizing field is large and is easily demagnetized.
  • a high coercive force layer is provided on the side surface of each magnet to reduce the influence of thermal demagnetization of the part and reduce irreversibly. Generation of magnetism can be suppressed.
  • the high coercive force layer can be formed as a diffusion layer in which heavy rare earths (Dy: dysprosium, Tb: terbium, etc.) are diffused.
  • the high coercive force layer may be provided only on the side surface of the magnet, and the increase in product cost due to the use of expensive heavy rare earth is small.
  • a plurality of magnets are arranged on one surface of a pair of non-magnetic holding bodies facing each other with a magnetic field generating space therebetween, and the respective main surfaces facing the magnetic field generating space are aligned.
  • the magnet has a magnetization direction orthogonal to the main surface at a central position in a parallel arrangement direction, and continuously reduces an inclination angle with respect to the main surface on both sides of the central position. It is a concentrated orienting magnet having a direction, and is arranged in parallel with the directions of adjacent magnetizations reversed.
  • the magnetic field generating device is configured by arranging the concentrated orientation magnets whose magnetization directions are continuously changed and concentrated in the center of the main surface on one surface of the non-magnetic holder.
  • There is no sudden change in the direction of magnetization inside the magnet which can reduce the occurrence of demagnetizing fields, suppress the occurrence of irreversible demagnetization due to the effects of thermal demagnetization, and short circuit of magnetic paths between adjacent magnets Can be reduced. Therefore, in order to suppress irreversible demagnetization, a material having a high residual magnetic flux density can be used for the magnet instead of a material having a high coercive force, and a magnetic flux density as high as possible can be realized in the magnetic field generation space.
  • a lightweight material such as aluminum or CFRP (carbon fiber reinforced plastic) can be used, and the weight of the magnetic field generator can be reduced.
  • the linear motor according to the present invention further includes the magnetic field generator as described above and a coil disposed in a magnetic field generated by the magnetic field generator, and the coil and the magnetic field generator are arranged in parallel with the plurality of magnets. It is characterized by relative movement in the installation direction.
  • a linear motor is configured by arranging a coil in the magnetic field generated by the magnetic field generator.
  • the magnetic field generator can form a magnetic field having a high magnetic flux density without being affected by thermal demagnetization, and can stably realize a high output operation in various environments.
  • a concentrated orientation magnet whose magnetization direction is continuously changed is used as a main pole, and is arranged in parallel with an auxiliary pole on one surface of a yoke or a non-magnetic holding body. It is possible to generate a magnetic field with a high magnetic flux density by interacting with the auxiliary pole, suppress the increase of the demagnetizing field inside the main pole, and suppress the occurrence of irreversible demagnetization due to the effect of thermal demagnetization. Therefore, a material having a high residual magnetic flux density can be used for the main pole, and further, the magnetic flux density can be prevented from decreasing with time.
  • the concentrated orientation magnets whose magnetization directions continuously change are arranged side by side on the surface of the yoke or the nonmagnetic material holder, so that a magnetic field with a high magnetic flux density can be generated.
  • the generation of demagnetizing magnetic field inside the magnet is mitigated, and it is possible to suppress the occurrence of irreversible demagnetization due to the effect of thermal demagnetization. Can be prevented.
  • FIG. 3 is a cross-sectional view illustrating a configuration example of a linear motor using the magnetic field generation device according to the first embodiment.
  • FIG. 9 is a cross-sectional view illustrating a schematic configuration of a magnetic field generation device according to a fifth embodiment. It is explanatory drawing of the effect
  • FIG. 9 is a cross-sectional view showing a schematic configuration of a magnetic field generator according to a sixth embodiment.
  • FIG. 10 is a cross-sectional view showing a schematic configuration of a magnetic field generator according to a seventh embodiment.
  • FIG. 10 is a cross-sectional view illustrating a schematic configuration of a magnetic field generator according to an eighth embodiment.
  • FIG. 10 is a cross-sectional view illustrating a schematic configuration of a magnetic field generator according to a ninth embodiment.
  • FIG. 10 is a cross-sectional view showing a configuration example of a linear motor using a magnetic field generator according to a fifth embodiment.
  • FIG. 1 is a cross-sectional view illustrating a schematic configuration of the magnetic field generation apparatus according to the first embodiment.
  • This magnetic field generator includes a plurality of yokes (yokes) 3, 3 arranged opposite to each other with a gap to be a magnetic field generation space, and a plurality of yokes 3, 3 arranged in parallel to each other.
  • the cross-sectional shapes of the main electrode 1 and the auxiliary electrode 2 are rectangular shapes having substantially constant widths in the parallel direction.
  • the main pole 1 and the auxiliary pole 2 are magnets having a high residual magnetic flux density Br such as rare earth iron boron-based magnets.
  • a magnet powder containing rare earth such as neodymium (Nd), iron (Fe), and boron (B) in a predetermined ratio is compression-molded in a magnetic field, and then sintered under an inert gas or vacuum.
  • a sintered body having the orientation of the magnetic field as an orientation direction is formed, and an external magnetic field is applied to the sintered body to magnetize the sintered body.
  • the arrows in FIG. 1 indicate the magnetization directions of the main pole 1 and the auxiliary pole 2.
  • the main pole 1 has a magnetization direction orthogonal to the main surface at the center position of the surface (main surface) facing the magnetic field generation space, and is inclined with respect to the main surface on both sides of the center position.
  • the inclination angle has a magnetization direction that continuously decreases toward the end.
  • the main pole 1 having such a magnetization direction is a sintered body obtained by performing compression molding of the above-described alloy powder in a magnetic field that radiates from the center of the main surface, and undergoing a subsequent sintering step. Manufactured by a procedure of magnetizing in an external magnetic field orthogonal to the plane. This type of magnet is called a concentrated orientation magnet because the orientation direction is concentrated in the center of the main surface.
  • the auxiliary pole 2 magnetizes a sintered body produced with an orientation direction parallel to the main surface facing the magnetic field generation space by applying an external magnetic field in the same direction as the orientation direction, It is comprised as a magnet which has a magnetization direction parallel to.
  • FIG. 1 there are two types of complementary poles 2 in which the directions of magnetization are reversed.
  • the main pole 1 whose main surface side is an N pole between the main poles 1 and 1 arranged in parallel as described above.
  • the magnets are interposed with their respective magnetization directions facing each other.
  • the magnetic field generator is configured by arranging the pair of yokes 3 and 3 having the main pole 1 and the auxiliary pole 2 arranged in parallel as described above so that the main poles 1 and 1 having different magnetic poles face each other. According to this magnetic field generator, the magnetic field formed between the opposing portions of the main poles 1 and 1 is strengthened by the action of the auxiliary poles 2 and 2 on both sides, as shown by white arrows in FIG. A magnetic field having a high magnetic flux density can be generated in the magnetic field generation space.
  • the main pole 1 is configured as a concentrated orientation magnet whose magnetization direction is set as described above, and can concentrate the magnetic flux between the opposed portions of the main poles 1 and 1, further increasing the magnetic flux density in the magnetic field generation space. It becomes possible.
  • the magnetization direction of the main pole 1 continuously changes from the central part of the main surface toward both sides.
  • the main pole 1 has a configuration in which a large number of magnets having slightly different inclination angles with respect to the main surface are arranged with the main surfaces aligned, and there is no sudden change portion in the magnetization direction. Therefore, the possibility that the demagnetizing field inside the main pole 1 increases can be mitigated, the occurrence of thermal demagnetization in the use environment can be reduced, and the magnetic flux density in the magnetic field generation space can be prevented from decreasing over time. be able to.
  • FIG. 2 and 3 are explanatory diagrams of the operation and effect of the magnetic field generator according to Embodiment 1.
  • FIG. FIG. 2 is a conventional magnetic field generator employing the Halbach array described in Patent Document 1
  • FIG. 3 is a magnetic field generator employing the Halbach array using the concentrated orientation magnet of the first embodiment as the main pole.
  • one side of the magnetic field generating device constituted by the yoke 3, the main pole 1 and the auxiliary pole 2 which are opposed to each other is shown.
  • the arrow in the figure indicates the direction of magnetization, and the length of the arrow indicates the magnet length in the magnetization direction.
  • the region indicated by the solid triangle is a portion where demagnetization is likely to occur due to the arrangement of the magnets.
  • the part where the demagnetization is likely to occur is the joint part side of the main pole 1 and the vicinity of the auxiliary pole 2 (part A) with respect to the yoke 3, and the auxiliary pole 2 is connected to the yoke 3. It is a site
  • a concentrated orientation magnet is used as the main pole 1, and the magnet length in the magnetization direction including a portion that tends to be demagnetized becomes long, and a region A indicated by a broken triangle (FIG. 2). Demagnetization can also be suppressed in the case A). In other words, since the permeance coefficient becomes large, demagnetization can be suppressed.
  • the magnetization direction of the main pole 1 is inclined with respect to the main surface, and the magnetization direction of the auxiliary pole 2 is parallel to the main surface. Therefore, there is a possibility that the demagnetizing field may increase due to a sudden change in the magnetization direction at the boundary portion (B portion in FIG. 3) between the main pole 1 and the auxiliary pole 2.
  • the auxiliary pole 2 can be demagnetized by using a magnet having a high coercive force, but at the same time, since the residual magnetic flux density is lowered, the magnetic flux density in the magnetic field generation space may be lowered.
  • FIG. 4 is a cross-sectional view showing a schematic configuration of the magnetic field generator according to the second embodiment.
  • This magnetic field generator includes a main pole 1 and an auxiliary pole 2 similar to those in the first embodiment, and these are arranged side by side on opposing surfaces of a pair of yokes 3 and 3.
  • This magnetic field generator is further provided with a high coercive force layer 4 at the boundary between the main pole 1 and the auxiliary pole 2.
  • the high coercive force layer 4 can be formed as a diffusion layer in which heavy rare earth such as Dy and Tb is diffused.
  • the high coercive force layer 4 provided in this way increases the coercive force at the boundary between the main pole 1 and the auxiliary pole 2 and reduces the occurrence of thermal demagnetization.
  • the high coercive force layer 4 may be provided on either the main pole 1 or the auxiliary pole 2, but may be provided on both the main pole 1 and the auxiliary pole 2.
  • FIG. 5 is a cross-sectional view showing a schematic configuration of the magnetic field generation device according to the third embodiment, and similarly to FIGS. 2 and 3, the magnetic field generation device including the opposing yoke 3, main pole 1, and auxiliary pole 2. One side of is shown.
  • the main pole 1 and the auxiliary pole 2 of this magnetic field generator have an isosceles trapezoidal cross-sectional shape with the same inclination of the hypotenuse, the main pole 1 faces the lower base toward the yoke 3, and the auxiliary pole 2 is They are arranged in such a manner that they are alternately arranged with their upper bases facing the yoke 3 and their hypotenuses are in contact with each other.
  • the portion opposite to the joint with the yoke 3, which is a portion where the depolarization of the auxiliary pole 2 is likely to occur (the portion corresponding to the portion B in FIG. 2) has a relative width in a sectional view.
  • the length of the magnet in the magnetization direction is long and the permeance coefficient is high, so that it is difficult to demagnetize. Therefore, it is possible to suppress the occurrence of demagnetization in the region indicated by the broken triangles of the main pole 1 and the auxiliary pole 2.
  • FIG. 6 is a cross-sectional view showing a schematic configuration of the magnetic field generator according to the fourth embodiment. Similar to FIGS. 2, 3, and 5, the magnetic field generator configured by the opposing yoke 3, main pole 1, and auxiliary pole 2. One side of is shown.
  • the main pole 1 of the magnetic field generator of this embodiment has an isosceles trapezoidal cross-sectional shape as in the third embodiment, whereas the auxiliary pole 2 is different from the third embodiment in that the main pole 1 is inclined and It has a cross-sectional shape of an isosceles triangle having oblique sides having the same length.
  • the main pole 1 and the auxiliary pole 2 are arranged in such a manner that the lower base of the main pole 1 and the apex of the auxiliary pole 2 are alternately arranged toward the yoke 3 side, and the respective hypotenuses are aligned.
  • the side opposite to the joint portion with the yoke 3 which is a portion where the depolarization of the auxiliary pole 2 is likely to occur (a portion corresponding to the portion B in FIG. 2).
  • auxiliary pole 2 having a larger width on the side opposite to the yoke 3 than the width on the side in contact with the yoke 3
  • a portion on the side opposite to the yoke 3 is used. Therefore, the occurrence of demagnetization in the auxiliary pole 2 can be suppressed.
  • a material having a high magnetic flux density can be used instead of a material having a high coercive force as a material of the auxiliary pole 2, so that a magnetic field generator having a high magnetic flux density can be realized.
  • the supplementary pole 2 having the shape shown in the third and fourth embodiments is used, if there is a slight demagnetization, the supplementary pole 2 made of a material having a slightly reduced residual magnetic flux density and a slightly increased coercive force is used. By using it, it is possible to realize a magnetic field generating apparatus that suppresses demagnetization while suppressing a decrease in magnetic flux density in the magnetic field generating space.
  • a holder made of a non-magnetic material such as aluminum or CFRP (carbon fiber reinforced plastic) is used in place of the yoke 3, and the main electrode 1 is provided on one surface of the holder.
  • the auxiliary pole 2 may be held in parallel.
  • the nonmagnetic holding body is lighter than the yoke 3 and can reduce the weight of the magnetic field generator.
  • FIG. 7 is a cross-sectional view showing a configuration example of a linear motor using the magnetic field generator according to the first embodiment.
  • the illustrated linear motor is configured by arranging a coil module 6 including a coil 5 between opposed portions of a main pole 1 and an auxiliary pole 2 that are fixedly arranged.
  • the coil module 6 is supported by a guide rail 7 that extends in the direction in which the main pole 1 and the auxiliary pole 2 are juxtaposed, and constitutes a mover that can move along the direction in which the guide rail 7 extends.
  • a magnetic field having a high magnetic flux density is generated by the above-described action of the main pole 1 and the auxiliary pole 2, and this magnetic field is subjected to thermal demagnetization in the use environment. It is difficult to suppress a decrease in magnetic flux density over time, and therefore a linear motor capable of stable and high-power operation over a long period can be provided.
  • the high coercive force layer 4 can be provided between the main pole 1 and the auxiliary pole 2 of the magnetic field generator, and this can further reduce thermal demagnetization.
  • FIG. 7 shows a linear motor having the coil module 6 as a mover.
  • the motor can be similarly configured.
  • a similar linear motor can be configured using the magnetic field generators of the second to fourth embodiments.
  • FIG. 8 is a cross-sectional view showing a schematic configuration of the magnetic field generator according to the fifth embodiment.
  • This magnetic field generator includes a plurality of magnets 10, 10 arranged in parallel on opposing surfaces of a pair of yokes 20, 20 that are opposed to each other across a magnetic field generation space, and both yokes 20, 20. It has ... *
  • the magnet 10 is a magnet having a high residual magnetic flux density Br such as a rare earth iron boron-based magnet.
  • This type of magnet 10 is formed by compressing an alloy powder containing rare earth such as neodymium (Nd), iron (Fe), and boron (B) in a predetermined ratio in a magnetic field, and then firing the powder in an inert gas or under vacuum. This is produced by forming a sintered body having the direction of the magnetic field as the orientation direction and magnetizing the sintered body by applying an external magnetic field.
  • the magnet 10 has a magnetization direction orthogonal to the main surface at the center position of the surface (main surface) facing the magnetic field generation space, and is inclined with respect to the main surface on both sides of the center position.
  • the inclination angle has a magnetization direction that continuously decreases toward the end.
  • the magnet 10 having such a magnetization direction is obtained by performing compression molding of the above-described alloy powder in a magnetic field extending radially from the center of the main surface, and using the sintered body obtained through the subsequent sintering step as the main surface. It is manufactured by the procedure of magnetizing in an external magnetic field orthogonal to.
  • This type of magnet 10 is referred to as a concentrated orientation magnet because the orientation direction is concentrated at the center of the main surface.
  • the direction of the external magnetic field coincides with the orientation direction at the center of the main surface, while it tilts with respect to the orientation direction on both sides. However, when the tilt angle is not excessively large, the magnetization direction coincides with the orientation direction.
  • the direction of magnetization of the magnet 10 depends on the direction of the external magnetic field.
  • the magnet 10 is composed of two types of magnets in which the main surface facing the magnetic field generation space is an N pole and the main surface is an S pole by magnetization in a reverse magnetic field. ing. Such magnets 10 are juxtaposed in the longitudinal direction of the yoke 20 so that different magnetic poles are adjacent to each other at a predetermined interval.
  • the magnetic field generator is configured by arranging the pair of yokes 20, 20 having the magnets 10, 10,... Arranged in parallel as described above so that the magnets 10, 10 having different magnetic poles face each other. According to this magnetic field generator, a magnetic field having a high magnetic flux density can be generated in the magnetic field generating space between the opposing portions of the magnets 10 and 10, as indicated by white arrows in FIG.
  • the magnet 10 is configured as a concentrated orientation magnet with the magnetization direction set as described above, and the magnetic flux can be concentrated between the opposed portions of the magnets 10 and 10, and the magnetic flux density in the magnetic field generation space can be increased. It becomes.
  • the magnetization direction of the magnet 10 continuously changes from the central portion of the main surface toward both sides.
  • the magnet 10 has a configuration in which a large number of magnets with slightly different inclination angles in the magnetization direction with respect to the main surface are arranged with the main surface aligned, and the magnet 10 has a sudden change in the magnetization direction. There is no part.
  • the possibility that a large demagnetizing field is generated inside the magnet 10 can be mitigated, the influence of thermal demagnetization in the use environment can be reduced, and the magnetic flux density in the magnetic field generating space can be prevented from decreasing over time. be able to.
  • the magnets 10 and 10 which adjoin each other are spaced apart in the parallel arrangement direction, and the parallel arrangement space
  • FIG. 9 and FIG. 10 are explanatory diagrams of the operation and effect of the magnetic field generator according to the fifth embodiment.
  • FIG. 9 shows a conventional magnetic field generator using magnets 10, 10,... Having a magnetization direction orthogonal to the main surface facing the magnetic field generating space.
  • FIG. 10 shows the magnetic field generator of the fifth embodiment. 1 shows one side of a magnetic field generating device constituted by a yoke 20 and a magnet 10 facing each other.
  • 9 and 10 indicate the magnetization direction in the magnet 10, and the length of the arrow indicates the magnet length in the magnetization direction. 9 and 10, that is, the magnet length in the magnetization direction at both sides in the juxtaposed direction is substantially longer in FIG. 10 than in FIG. 9. Therefore, the magnetic field generator shown in FIG. 10 has a large permeance coefficient and is difficult to demagnetize.
  • FIGS. 9 and 10 indicate a state of short circuit of the magnetic path between the adjacent magnets 10 and 10.
  • the directions of magnetization at the ends of adjacent magnets 10 and 10 are separated from each other, and a short circuit of the magnetic path between these magnets 10 and 10 is shown in FIG. It will occur between longer paths than in the magnetic field generator. Therefore, in the magnetic field generator shown in FIG. 10, the short circuit of the magnetic path between the adjacent magnets 10 and 10 is reduced, the amount of magnetic flux generated from each magnet 10 to the magnetic field generating space is increased, and the magnetic field having a high magnetic flux density. Can be generated.
  • FIG. 12 is a sectional view showing a schematic configuration of the magnetic field generator according to the seventh embodiment.
  • this magnetic field generator is configured by arranging a plurality of magnets 10, 10,... On the opposing surfaces of a pair of yokes 20, 20, with a predetermined distance therebetween.
  • the high coercive force layer 30 is further formed on the side surfaces on both sides of the magnets 10 in the juxtaposed direction.
  • the high coercive force layer 30 can be formed as a diffusion layer obtained by diffusing heavy rare earths such as Dy and Tb over a suitable depth from the surface.
  • the high coercive force layer 30 provided in this way increases the coercive force of the side surface portion of each magnet 10 and reduces the influence of thermal demagnetization.
  • the high coercive force layer 30 may be formed around the corners on the opposite side to the yoke 20 of each magnet 10 that is particularly affected by the demagnetizing field, in addition to the side surfaces on both sides of the juxtaposed direction. Further, the high coercivity layer 30 is formed only on the side surface near the corner opposite to the yoke 20 instead of the entire side surface of each magnet 10, or the high coercivity layer 30 is formed on the side surface and main surface near the corner. May be.
  • the widths of the magnets 10 in the juxtaposition direction are narrow on the main surface side facing the magnetic field generating space and wide on the yoke 20 side.
  • the interval between the magnets 10 and 10 is Y on the yoke 20 side, whereas it is X (> Y) on the side facing the magnetic field generation space. Therefore, a short circuit of the magnetic path between the adjacent magnets 10 and 10 occurs between paths longer than the fifth embodiment shown in FIG. 10 as indicated by white arrows in the figure. Short circuit can be further reduced, and a magnetic field having a high magnetic flux density can be generated.
  • each magnet 10 is narrow on the main surface side and wide on the yoke 20 side
  • the sectional shape of each magnet 10 is not limited to the isosceles trapezoidal shape shown in FIG.
  • the trapezoid may be an unequal leg trapezoid, or may be a trapezoid whose hypotenuse is concave or convex.
  • the cross-sectional shape of each magnet 10 is an isosceles trapezoid as shown in FIG. 13, the magnetization direction in the magnet 10 can be well concentrated in the center, and a uniform magnetic flux density waveform can be realized in the magnetic field generation space. Can do.
  • FIG. 14 is a cross-sectional view showing a schematic configuration of the magnetic field generator according to the ninth embodiment. Similarly to FIGS. 9 to 11 and FIG. 13, the magnetic field constituted by the opposing yoke 20 and the plurality of magnets 10, 10,. One side of the generator is shown.
  • This magnetic field generator uses isosceles trapezoidal magnets 10, 10... Similar to those in the eighth embodiment, but these are arranged side by side so as to be adjacent to each other on the side of the yoke 20 which has become wide. ing.
  • the high coercive force layers 30 can be provided on the side surfaces on both sides of the magnets 10 in the parallel arrangement direction.
  • a holder made of a non-magnetic material such as aluminum or CFRP (carbon fiber reinforced plastic) is used in place of the yoke 20, and the magnet 10 is mounted on one surface of the holder. It may be held side by side.
  • the nonmagnetic holding body is lighter than the yoke 20 and can reduce the weight of the magnetic field generator.
  • FIG. 15 is a cross-sectional view showing a configuration example of a linear motor using the magnetic field generation apparatus according to the fifth embodiment.
  • the illustrated linear motor is configured by arranging a coil module 50 including a coil 40 between opposed portions of magnets 10, 10.
  • the coil module 50 is supported by a guide rail 60 extending in the direction in which the magnets 10, 10... Are arranged in parallel, and constitutes a mover that can move along the extending direction of the guide rail 60.
  • the linear motor configured as described above, by the energization control of the coil 40 provided in the coil module 50, a moving force along the parallel arrangement direction of the magnets 10, 10,.
  • the module 50 is linearly moved under the guidance of the guide rail 60.
  • a magnetic field having a high magnetic flux density is generated by the above-described action. Further, this magnet is not easily subjected to thermal demagnetization in the use environment, and the magnetic flux density is changed over time. Since the decrease is suppressed, it is possible to provide a linear motor capable of operating at a stable high output over a long period of time.
  • the linear motor shown in FIG. 15 can be similarly configured using the magnetic field generator according to Embodiments 6 to 9.
  • 15 shows a linear motor having the coil module 50 as a mover, the linear motor having the coil module 50 as a stator and the magnetic field generator (magnet 10 and yoke 20) as a mover is similarly configured. It goes without saying that it can be done.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Linear Motors (AREA)

Abstract

L'invention porte sur une pluralité de pôles principaux et d'inter-pôles qui sont agencés côte à côte d'une manière alternée, les surfaces principales de ces derniers étant alignées, sur une surface d'une culasse qui est tournée vers un espace de génération de champ magnétique. Chaque pôle principal est un aimant à orientation convergente dans lequel la direction d'aimantation de l'aimant, au milieu dudit aimant dans la direction dans laquelle les aimants sont disposés côte à côte, est perpendiculaire à la surface principale de l'aimant et l'angle d'inclinaison de la direction d'aimantation de l'aimant par rapport à la surface principale de ce dernier diminue de manière continue sur les deux côtés du milieu susmentionné de l'aimant. Chaque inter-pôle est un aimant qui est aimanté dans une direction parallèle à la surface principale dudit aimant, et les inter-pôles sont disposés de telle sorte que les directions d'aimantation de ces derniers sont tournées vers les pôles principaux, qui sont aimantés vers les surfaces principales de ces derniers. Il n'existe aucune section à l'intérieur des pôles principaux dans laquelle les directions d'aimantation de ces derniers changent de manière abrupte, réduisant à un minimum des augmentations de désaimantation, ainsi qu'une désaimantation irréversible due à des effets de désaimantation thermique. Un matériau ayant une densité de flux résiduel élevée peut ainsi être utilisé pour les pôles principaux, et les inter-pôles agissent pour renforcer les champs magnétiques formés par lesdits pôles magnétiques, permettant à la densité du flux magnétique d'être la plus grande possible.
PCT/JP2014/078640 2013-11-12 2014-10-28 Dispositif de génération de champ magnétique et moteur linéaire WO2015072328A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2015547722A JPWO2015072328A1 (ja) 2013-11-12 2014-10-28 磁界発生装置及びリニアモータ

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2013234277 2013-11-12
JP2013-234277 2013-11-12
JP2013273082 2013-12-27
JP2013-273082 2013-12-27

Publications (1)

Publication Number Publication Date
WO2015072328A1 true WO2015072328A1 (fr) 2015-05-21

Family

ID=53057267

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2014/078640 WO2015072328A1 (fr) 2013-11-12 2014-10-28 Dispositif de génération de champ magnétique et moteur linéaire

Country Status (2)

Country Link
JP (1) JPWO2015072328A1 (fr)
WO (1) WO2015072328A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3719980A1 (fr) * 2019-04-01 2020-10-07 LIM-Tech Limited Machine électromotrice
JP6804705B1 (ja) * 2020-03-10 2020-12-23 三菱電機株式会社 可動子及びリニアサーボモータ
EP3734815A4 (fr) * 2017-12-28 2021-09-08 KYB Corporation Moteur linéaire cylindrique
US11476731B2 (en) 2019-04-01 2022-10-18 LIM-Tech Limited Electromotive machine

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002369492A (ja) * 2001-06-06 2002-12-20 Hitachi Metals Ltd 永久磁石及びこれを用いた磁場発生用磁気回路並びにリニアアクチュエータ
JP2007110822A (ja) * 2005-10-13 2007-04-26 Yaskawa Electric Corp 周期磁界発生装置とその製造方法およびこの周期磁界発生装置を用いたリニアモータ
JP2007312449A (ja) * 2006-05-16 2007-11-29 Yaskawa Electric Corp 周期磁界発生装置およびこれを用いた電動機
JP2009247041A (ja) * 2008-03-28 2009-10-22 Tdk Corp 回転機
JP2010050440A (ja) * 2008-07-23 2010-03-04 Hitachi Metals Ltd Ｒ−Ｆｅ−Ｂ系焼結磁石ユニットおよびそれを用いたリニアモータ用磁気回路並びにそれらの製造方法
JP2010063201A (ja) * 2008-09-01 2010-03-18 Mitsubishi Electric Corp リニアモータ
JP2010104136A (ja) * 2008-10-23 2010-05-06 Mitsubishi Electric Corp リニアモータ
JP2010136516A (ja) * 2008-12-04 2010-06-17 Hitachi Metals Ltd 磁界発生装置
JP2010258181A (ja) * 2009-04-24 2010-11-11 Mitsubishi Electric Corp 異方性磁石及びその製造方法
JP2013247721A (ja) * 2012-05-24 2013-12-09 Panasonic Corp 異方性磁石ロータとその製造方法およびそれらを用いたモータ

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002369492A (ja) * 2001-06-06 2002-12-20 Hitachi Metals Ltd 永久磁石及びこれを用いた磁場発生用磁気回路並びにリニアアクチュエータ
JP2007110822A (ja) * 2005-10-13 2007-04-26 Yaskawa Electric Corp 周期磁界発生装置とその製造方法およびこの周期磁界発生装置を用いたリニアモータ
JP2007312449A (ja) * 2006-05-16 2007-11-29 Yaskawa Electric Corp 周期磁界発生装置およびこれを用いた電動機
JP2009247041A (ja) * 2008-03-28 2009-10-22 Tdk Corp 回転機
JP2010050440A (ja) * 2008-07-23 2010-03-04 Hitachi Metals Ltd Ｒ−Ｆｅ−Ｂ系焼結磁石ユニットおよびそれを用いたリニアモータ用磁気回路並びにそれらの製造方法
JP2010063201A (ja) * 2008-09-01 2010-03-18 Mitsubishi Electric Corp リニアモータ
JP2010104136A (ja) * 2008-10-23 2010-05-06 Mitsubishi Electric Corp リニアモータ
JP2010136516A (ja) * 2008-12-04 2010-06-17 Hitachi Metals Ltd 磁界発生装置
JP2010258181A (ja) * 2009-04-24 2010-11-11 Mitsubishi Electric Corp 異方性磁石及びその製造方法
JP2013247721A (ja) * 2012-05-24 2013-12-09 Panasonic Corp 異方性磁石ロータとその製造方法およびそれらを用いたモータ

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3734815A4 (fr) * 2017-12-28 2021-09-08 KYB Corporation Moteur linéaire cylindrique
US11245321B2 (en) 2017-12-28 2022-02-08 Kyb Corporation Cylindrical linear motor
EP3719980A1 (fr) * 2019-04-01 2020-10-07 LIM-Tech Limited Machine électromotrice
US11476731B2 (en) 2019-04-01 2022-10-18 LIM-Tech Limited Electromotive machine
JP6804705B1 (ja) * 2020-03-10 2020-12-23 三菱電機株式会社 可動子及びリニアサーボモータ
WO2021181516A1 (fr) * 2020-03-10 2021-09-16 三菱電機株式会社 Dispositif de déplacement et servomoteur linéaire

Also Published As

Publication number Publication date
JPWO2015072328A1 (ja) 2017-03-16

Similar Documents

Publication Publication Date Title
US6236125B1 (en) Linear actuator
EP0479514A1 (fr) Dispositif pour la génération d'un champ magnétique pour l'imagerie par résonance magnétique
JPH0831635A (ja) Ｍｒｉ用磁界発生装置
JP2010130818A (ja) 界磁子の製造方法
WO2015072328A1 (fr) Dispositif de génération de champ magnétique et moteur linéaire
WO1993018707A1 (fr) Generateur de champ magnetique destine a l'imagerie par resonance magnetique_____________________________________________________
JP2016029880A (ja) 磁石ユニット及び磁石ユニットの製造方法
JP3150248B2 (ja) Ｍｒｉ用磁界発生装置
JP6016833B2 (ja) 電気機械
CN105280324B (zh) 磁铁单元和磁铁单元的制造方法
JP2561591B2 (ja) Ｍｒｉ用磁界発生装置
JP2002369492A (ja) 永久磁石及びこれを用いた磁場発生用磁気回路並びにリニアアクチュエータ
JP2003333823A (ja) ボイスコイル形リニアモータ
US20180145548A1 (en) Magnetic field generating member and motor including same
JP3792181B2 (ja) 磁界形成装置
JP5553247B2 (ja) リニアスライダ
JP4387877B2 (ja) 着磁装置、ボイスコールモータ、およびボイスコイルモータの製造方法
JP5088536B2 (ja) 可動コイル型リニアモータの組立方法
JP6455061B2 (ja) リニアモータ用固定子
KR101367222B1 (ko) 영구자석 동기 모터
JP4214736B2 (ja) Ｍｒｉ用磁界発生装置
JPS62139304A (ja) 磁界均一性のよい磁気回路
JP2014011889A (ja) リニアモータ
JP3059596B2 (ja) Ｍｒｉ用磁界発生装置
JP2007165741A (ja) 永久磁石ユニットおよびそれを備える磁界発生装置

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 14862082

Country of ref document: EP

Kind code of ref document: A1

ENP Entry into the national phase

Ref document number: 2015547722

Country of ref document: JP

Kind code of ref document: A

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 14862082

Country of ref document: EP

Kind code of ref document: A1