JP2010252515A - Method for manufacturing magnet body for field pole and permanent magnet type electric motor - Google Patents

Method for manufacturing magnet body for field pole and permanent magnet type electric motor Download PDF

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JP2010252515A
JP2010252515A JP2009098827A JP2009098827A JP2010252515A JP 2010252515 A JP2010252515 A JP 2010252515A JP 2009098827 A JP2009098827 A JP 2009098827A JP 2009098827 A JP2009098827 A JP 2009098827A JP 2010252515 A JP2010252515 A JP 2010252515A
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magnet
magnet body
pieces
field pole
manufacturing
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JP5428482B2 (en
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Kazuhiro Takaichi
一宏 高市
Kunitomo Ishiguro
国朋 石黒
Masanori Iwamoto
雅則 岩本
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Nissan Motor Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To improve a contact resistance between magnet pieces of a magnet body for a field pole consisting of a plurality of magnet pieces. <P>SOLUTION: The method for manufacturing a magnet body for a field pole arranged in a rotor or a stator of a permanent magnet type electric motor includes: a step of splitting the magnet body into a plurality of magnet pieces 31 by breaking the magnet body; a step of peeling the surface layer portion of the broken surface 33 of the magnet pieces 31 split in the splitting step; and a step of integrally coupling the plurality of magnet pieces 31 from which the surface layer portion is peeled in the peeling step. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

本発明は、永久磁石型電動機に用いる界磁極用磁石体の製造方法及び永久磁石型電動機に関する。   The present invention relates to a method for manufacturing a field pole magnet used for a permanent magnet type electric motor and a permanent magnet type electric motor.

永久磁石型電動機では界磁極用磁石体がロータ又はステータを構成する鉄心の周方向に均等に複数設けられる。特許文献１には、鉄心の軸方向に複数分割された磁石片の集合体として構成される磁石体を鉄心の周方向に複数設けられる取り付け孔に挿入嵌設することが記載されている。磁石体は複数の磁石片に分割されているので、磁石片間の接触抵抗によってうず電流損を抑制して磁石体の発熱を抑制することができる。   In the permanent magnet type electric motor, a plurality of field pole magnet bodies are equally provided in the circumferential direction of the iron core constituting the rotor or stator. Patent Document 1 describes that a magnet body configured as an assembly of magnet pieces divided into a plurality of parts in the axial direction of the iron core is inserted and fitted into a plurality of mounting holes provided in the circumferential direction of the iron core. Since the magnet body is divided into a plurality of magnet pieces, the eddy current loss can be suppressed by the contact resistance between the magnet pieces, and the heat generation of the magnet body can be suppressed.

特開平１１−２５２８３３号公報JP 11-252833 A

上記従来の技術では、例えば回転刃物などによって磁石体を切断することで磁石体を各磁石片に分割し、さらに各磁石片の寸法が規定範囲内となるように磁石片の分割面を研削加工によって研磨していた。しかし、磁石片の分割面を切断及び研削加工することにより分割面の平滑度が向上するので、隣接する磁石片同士の面精度が向上する。これにより、分割面の接触抵抗が低下するので、磁石体の発熱抑制効果が不十分であった。   In the above conventional technique, for example, the magnet body is divided into each magnet piece by cutting the magnet body with a rotary blade or the like, and further, the divided surface of the magnet piece is ground so that the size of each magnet piece is within a specified range. Was polished by. However, since the smoothness of the divided surfaces is improved by cutting and grinding the divided surfaces of the magnet pieces, the surface accuracy between adjacent magnet pieces is improved. Thereby, since the contact resistance of a division surface falls, the heat_generation | fever suppression effect of a magnet body was inadequate.

本発明は、複数の磁石片から構成される界磁極用磁石体の磁石片間の接触抵抗を向上させることを目的とする。   An object of this invention is to improve the contact resistance between the magnet pieces of the field pole magnet body comprised of a plurality of magnet pieces.

本発明は、永久磁石型電動機のロータ又はステータに配設される界磁極用磁石体の製造方法であって、磁石体を破断することで複数の磁石片に分割するステップと、分割するステップによって分割された磁石片の破断面の表層部を剥離させるステップと、剥離させるステップによって表層部を剥離させた複数の磁石片を一体的に結合するステップとを含むことを特徴とする。   The present invention is a method of manufacturing a field pole magnet body disposed on a rotor or stator of a permanent magnet type electric motor, wherein the magnet body is broken to be divided into a plurality of magnet pieces, and the splitting step is performed. The method includes a step of peeling the surface layer portion of the fractured surface of the divided magnet piece, and a step of integrally joining a plurality of magnet pieces having the surface layer portion peeled off by the peeling step.

本発明によれば、磁石体を破断することで複数の磁石片に分割し、磁石片の破断面を剥離させてから磁石片を一体的に結合するので、磁石片間の接触面積を低下させることができ、接触抵抗を増大させて磁石体の発熱抑制効果を向上させることができる。   According to the present invention, the magnet body is divided into a plurality of magnet pieces by breaking the magnet body, and the magnet pieces are integrally coupled after the fracture surface of the magnet pieces is peeled off, thereby reducing the contact area between the magnet pieces. It is possible to increase the contact resistance and improve the heat generation suppressing effect of the magnet body.

本実施形態における界磁極用磁石体の製造方法によって製造された磁石体を適用した永久磁石型電動機の主要部の構成を示す概略構成図である。It is a schematic block diagram which shows the structure of the principal part of the permanent magnet type electric motor to which the magnet body manufactured by the manufacturing method of the magnetic body for field poles in this embodiment is applied. 磁石体の構成を示す構成図である。It is a block diagram which shows the structure of a magnet body. 磁石分割治具の構成を示す構成図である。It is a block diagram which shows the structure of a magnet division jig. 磁石片の破断面を示す模式図である。It is a schematic diagram which shows the torn surface of a magnet piece. 磁石片の破断面を剥離させる工程を示す模式図である。It is a schematic diagram which shows the process of peeling the torn surface of a magnet piece. 磁石片の破断面を示す拡大図である。It is an enlarged view which shows the torn surface of a magnet piece. 破断面同士を当接させた状態を示す模式図である。It is a schematic diagram which shows the state which made the torn surfaces contact | abut. 別実施形態における磁石片の破断面を剥離させる工程を示す模式図である。It is a schematic diagram which shows the process of peeling the torn surface of the magnet piece in another embodiment. 別実施形態における磁石片の破断面を示す拡大図である。It is an enlarged view which shows the torn surface of the magnet piece in another embodiment. 別実施形態における破断面同士を当接させた状態を示す模式図である。It is a schematic diagram which shows the state which made the torn surfaces in another embodiment contact | abut. やすりがけの時間と磁石片間の接触抵抗との関係を示すテーブルである。It is a table which shows the relationship between the sanding time and the contact resistance between magnet pieces.

以下では図面を参照して本発明の実施の形態について詳しく説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

（第１実施形態）
図１は本実施形態における界磁極用磁石体の製造方法によって製造された磁石体を適用した永久磁石型電動機の主要部の構成を示す概略構成図であり、図１（ａ）は正面図、図１（ｂ）は図１（ａ）のＩ−Ｉ断面を示す断面図である。図２は磁石体の構成を示す構成図である。 (First embodiment)
FIG. 1 is a schematic configuration diagram showing a configuration of a main part of a permanent magnet type electric motor to which a magnet body manufactured by a method of manufacturing a field pole magnet body in the present embodiment is applied, and FIG. FIG.1 (b) is sectional drawing which shows the II cross section of Fig.1 (a). FIG. 2 is a configuration diagram showing the configuration of the magnet body.

永久磁石型電動機Ａ（以下、単に「電動機」という）は、図示しないケーシングの一部を構成する円環形のステータ１０と、このステータ１０と同軸的に配置された円柱形のロータ２０とから構成される。   The permanent magnet type electric motor A (hereinafter simply referred to as “electric motor”) includes an annular stator 10 constituting a part of a casing (not shown), and a cylindrical rotor 20 disposed coaxially with the stator 10. Is done.

ステータ１０は、ステータ本体１１と、複数のコイル１２とから構成され、複数のコイル１２はステータ本体１１に軸心Ｏを中心とした同一円周上に等角度間隔で形成されるコイル孔１３に収設される。   The stator 10 includes a stator body 11 and a plurality of coils 12. The plurality of coils 12 are formed in coil holes 13 formed at equal angular intervals on the same circumference around the axis O in the stator body 11. To be detained.

ロータ２０は、ロータ本体２１と、ロータ本体２１と一体的に回転する回転軸２３と、複数の界磁極用磁石体３０（以下、単に「磁石体」という）とから構成され、複数の磁石体３０は軸心Ｏを中心とした同一円周上に等角度間隔で形成される嵌合孔２２に収設される。   The rotor 20 includes a rotor body 21, a rotating shaft 23 that rotates integrally with the rotor body 21, and a plurality of field pole magnet bodies 30 (hereinafter simply referred to as “magnet bodies”). 30 are accommodated in fitting holes 22 formed at equal angular intervals on the same circumference around the axis O.

ロータ２０の嵌合孔２２に収設される磁石体３０は図２に示すように、磁石体３０を破断分割した複数の磁石片３１が一列に整列した磁石片３１の集合体として構成される。磁石片３１の集合体は隣接する磁石片３１間の接触面積によって磁石片３１間の接触抵抗が変化するので、磁石体３０の発熱を抑制するためには磁石片３１間の接触面積を小さくする必要がある。   As shown in FIG. 2, the magnet body 30 housed in the fitting hole 22 of the rotor 20 is configured as an aggregate of magnet pieces 31 in which a plurality of magnet pieces 31 obtained by breaking and dividing the magnet body 30 are aligned in a line. . In the assembly of the magnet pieces 31, the contact resistance between the magnet pieces 31 varies depending on the contact area between the adjacent magnet pieces 31. Therefore, in order to suppress the heat generation of the magnet body 30, the contact area between the magnet pieces 31 is reduced. There is a need.

従来、磁石体を回転刃物などによって切断することで個々の磁石片に分割し、さらに磁石片の寸法誤差を低減するために磁石片の分割面を研削していた。これにより、磁石片の分割面の平滑度が向上するので、隣接する磁石片間の接触面積が大きくなり、磁石体の分割による発熱抑制効果が低下するという問題があった。   Conventionally, the magnet body is divided into individual magnet pieces by cutting with a rotary blade or the like, and the division surface of the magnet pieces is ground to further reduce the dimensional error of the magnet pieces. Thereby, since the smoothness of the divided surface of a magnet piece improves, the contact area between adjacent magnet pieces becomes large, and there existed a problem that the heat_generation | fever suppression effect by division | segmentation of a magnet body fell.

そこで、本実施形態では磁石体３０を切断することに代えて、磁石体３０を破断させることで磁石片３１に分割する。図３は磁石体を破断させる磁石分割治具の構成を示す構成図である。   Therefore, in this embodiment, instead of cutting the magnet body 30, the magnet body 30 is broken and divided into magnet pieces 31. FIG. 3 is a configuration diagram showing a configuration of a magnet split jig for breaking the magnet body.

磁石分割治具４０は、磁石体３０を載置するダイ４１と、ダイ４１の端部４４において磁石体３０を固定する磁石固定治具４２と、磁石体３０のダイ４１からはみ出た部分を押し込むことで磁石体３０を破断させるパンチ４３とから構成される。   The magnet split jig 40 pushes the die 41 on which the magnet body 30 is placed, the magnet fixing jig 42 that fixes the magnet body 30 at the end 44 of the die 41, and the portion of the magnet body 30 that protrudes from the die 41. And a punch 43 that breaks the magnet body 30.

なお、磁石体３０には破断させたい所望の位置に予め溝３２を設けておく。溝３２は例えば機械的に切削することで形成してもよいし、レーザー加工やワイヤカット放電加工によって形成してもよい。   The magnet body 30 is previously provided with a groove 32 at a desired position to be broken. The groove 32 may be formed by, for example, mechanical cutting, or may be formed by laser processing or wire cut electric discharge processing.

磁石固定治具４２は磁石体３０をダイ４１へ向けて押圧することで固定する治具であり、ボルト締結又は油圧によって磁石体３０を押圧する。パンチ４３は磁石体３０のダイ４１から突き出た部分を下方へ押圧することで磁石体３０の溝３２に沿って磁石体３０を破断させる。パンチ４３は例えばサーボプレス、機械プレス、油圧プレスなどによって駆動される。   The magnet fixing jig 42 is a jig for fixing the magnet body 30 by pressing it toward the die 41, and presses the magnet body 30 by bolt fastening or hydraulic pressure. The punch 43 breaks the magnet body 30 along the groove 32 of the magnet body 30 by pressing a portion protruding from the die 41 of the magnet body 30 downward. The punch 43 is driven by, for example, a servo press, a mechanical press, a hydraulic press, or the like.

磁石分割治具４０は以上のように構成され、溝３２を設けた磁石体３０がダイ４１の上面に載置され、磁石片３１一つ分の長さだけダイ４１の右端より飛び出た状態で、磁石固定治具４２によって磁石体３０を固定する。さらにパンチ４３を下降させることで磁石体３０は溝３２に沿って破断分割される。以上の動作を繰り返すことで磁石体は複数の磁石片に破断分割される。   The magnet dividing jig 40 is configured as described above, and the magnet body 30 provided with the grooves 32 is placed on the upper surface of the die 41 and protrudes from the right end of the die 41 by the length of one magnet piece 31. The magnet body 30 is fixed by the magnet fixing jig 42. Further, the magnet body 30 is broken and divided along the groove 32 by lowering the punch 43. By repeating the above operation, the magnet body is broken and divided into a plurality of magnet pieces.

図４は磁石分割治具によって破断された磁石片の破断面を示す模式図である。磁石片３１は破断分割されることで破断面３３の表層部に微細なクラック３４が多数生じる。また、磁石片３１は切断される場合と比べて破断面３３の表面が凹凸形状となる。   FIG. 4 is a schematic view showing a fracture surface of a magnet piece broken by a magnet split jig. The magnet piece 31 is broken and divided so that many fine cracks 34 are generated in the surface layer portion of the fracture surface 33. Moreover, the surface of the torn surface 33 becomes uneven | corrugated compared with the case where the magnet piece 31 is cut | disconnected.

次に磁石片３１の破断面３３を剥離させる方法について図５〜図７を参照しながら説明する。図５は磁石片の破断面を剥離させる工程を示す模式図である。図６は磁石片の破断面を示す拡大図であり、図６（ａ）は剥離前、図６（ｂ）は剥離後を示す。図７（ａ）は剥離後の２つの磁石片の破断面同士を当接させた状態を示す模式図であり、図７（ｂ）は図７（ａ）の範囲Ａの拡大図である。   Next, a method for peeling the fracture surface 33 of the magnet piece 31 will be described with reference to FIGS. FIG. 5 is a schematic view showing a step of peeling the fracture surface of the magnet piece. FIG. 6 is an enlarged view showing a fracture surface of the magnet piece, FIG. 6 (a) shows before peeling, and FIG. 6 (b) shows after peeling. Fig.7 (a) is a schematic diagram which shows the state which contacted the torn surfaces of the two magnet pieces after peeling, and FIG.7 (b) is an enlarged view of the range A of Fig.7 (a).

本実施形態ではショット玉５１を高速で噴出するショットブラスト５０を用いて破断面を剥離させる。磁石固定治具４２によって固定される磁石片３１の破断面３３へ向けてショットブラスト５０によってショット玉５１を吹き付ける。ショット玉５１が破断面３３に衝突すると破断面３３の表層部がクラック３４を起点として薄く剥離する。これにより、表層部が剥離した破断面３３の表面は粗くなり、平滑度が低下する。   In the present embodiment, the fracture surface is peeled off using a shot blast 50 that ejects the shot ball 51 at a high speed. A shot ball 51 is sprayed by the shot blast 50 toward the fracture surface 33 of the magnet piece 31 fixed by the magnet fixing jig 42. When the shot ball 51 collides with the fracture surface 33, the surface layer portion of the fracture surface 33 peels thinly starting from the crack 34. Thereby, the surface of the torn surface 33 from which the surface layer portion has been peeled becomes rough, and the smoothness is lowered.

なおここで、磁石体３０を切削して分割した磁石片３１の切削面にブラスト処理を施しても切削面の平滑度を低下させることはできるが、本実施形態のように磁石体３０を破断した方が、破断面３３にクラック３４を生じさせることができるのでブラスト処理が容易である。すなわち、破断面３３にクラック３４が生じていることにより、表層部は脆くなっているので、ショット玉５１の圧力及び硬度をより低くしても表層部を容易に剥離させることができる。   Here, the smoothness of the cutting surface can be reduced even if the cutting surface of the magnet piece 31 divided by cutting the magnet body 30 is subjected to blasting, but the magnet body 30 is broken as in this embodiment. Since the crack 34 can be produced in the torn surface 33, the blasting process is easy. In other words, since the crack 34 is generated in the fracture surface 33, the surface layer portion is brittle. Therefore, even if the pressure and hardness of the shot ball 51 are lowered, the surface layer portion can be easily peeled off.

図７に示すように、ブラスト処理後の磁石片３１の破断面３３同士を当接させると、剥離した部分において破断面３３間にクリアランス３５が生じる。これにより、磁石片３１間の接触面積が低下して接触抵抗が増大する。なお、クリアランス３５はショット玉５１の圧力、硬度又はショット玉５１の径などを変えることで調整され、例えば１２０μｍ以下となるように設定される。   As shown in FIG. 7, when the fracture surfaces 33 of the magnet pieces 31 after the blasting process are brought into contact with each other, a clearance 35 is generated between the fracture surfaces 33 in the peeled portion. Thereby, the contact area between the magnet pieces 31 decreases and the contact resistance increases. The clearance 35 is adjusted by changing the pressure and hardness of the shot ball 51 or the diameter of the shot ball 51, and is set to be 120 μm or less, for example.

以上のように、破断分割された磁石片３１の破断面３３の表層部を剥離させた後、複数の磁石片３１を破断面３３同士が当接するように一列に配置して一体的に結合することで図２に示すような界磁極用磁石体３０が形成される。   As described above, after the surface layer portion of the fracture surface 33 of the magnet piece 31 divided by breaking is peeled off, the plurality of magnet pieces 31 are arranged in a row so that the fracture surfaces 33 come into contact with each other and are integrally coupled. Thus, a field pole magnet body 30 as shown in FIG. 2 is formed.

以上のように本実施形態では、磁石片３１の破断面３３を剥離させてから磁石片３１を一体的に結合するので、磁石片３１間の接触面積を低下させることができ、接触抵抗を増大させて、磁石片３１の集合体である磁石体３０の発熱抑制効果を向上させることができる。また、磁石体３０を破断することで複数の磁石片３１に分割するので、破断時に破断面３３の表層部にクラック３４を生じさせることができ、より容易に破断面３３を剥離させることができる。   As described above, in this embodiment, since the magnet pieces 31 are integrally coupled after the fracture surface 33 of the magnet pieces 31 is peeled off, the contact area between the magnet pieces 31 can be reduced, and the contact resistance is increased. Thus, the heat generation suppressing effect of the magnet body 30 that is an aggregate of the magnet pieces 31 can be improved. Further, since the magnet body 30 is broken to be divided into a plurality of magnet pieces 31, a crack 34 can be generated in the surface layer portion of the fracture surface 33 at the time of fracture, and the fracture surface 33 can be more easily peeled off. .

また、磁石片３１の破断面３３をブラスト処理によって剥離させるので、破断面３３の表層部をクラック３４を起点としてより確実に剥離させることができる。   Moreover, since the fracture surface 33 of the magnet piece 31 is peeled off by blasting, the surface layer portion of the fracture surface 33 can be peeled off more reliably starting from the crack 34.

さらに、磁石片３１の破断面３３を剥離させてから磁石片３１の破断面３３同士を当接させるので、磁石片３１間の接触抵抗が大きくなり、当該磁石体３０を電動機Ａのロータ２０又はステータ１０に配設した場合に磁石体３０の発熱抑制効果を向上させることができる。   Further, since the fracture surfaces 33 of the magnet pieces 31 are brought into contact with each other after the fracture surface 33 of the magnet piece 31 is peeled off, the contact resistance between the magnet pieces 31 is increased, and the magnet body 30 is connected to the rotor 20 of the electric motor A or When arranged on the stator 10, the heat generation suppressing effect of the magnet body 30 can be improved.

（第２実施形態）
本実施形態では磁石体３０を破断して磁石片３１に分割する工程は第１実施形態と同一であり、破断面３３を剥離させる工程が異なる。 (Second Embodiment)
In the present embodiment, the process of breaking the magnet body 30 and dividing it into the magnet pieces 31 is the same as that of the first embodiment, and the process of peeling the fracture surface 33 is different.

本実施形態における磁石片３１の破断面３３を剥離させる方法について図８〜図１０を参照しながら説明する。図８は磁石片の破断面を剥離させる工程を示す模式図である。図９は磁石片の破断面を示す拡大図であり、図９（ａ）は剥離前、図９（ｂ）は剥離後を示す。図１０（ａ）は剥離後の２つの磁石片の破断面同士を当接させた状態を示す模式図であり、図１０（ｂ）は図１０（ａ）の範囲Ｂの拡大図である。   A method for peeling the fracture surface 33 of the magnet piece 31 in the present embodiment will be described with reference to FIGS. FIG. 8 is a schematic view showing a step of peeling the fracture surface of the magnet piece. FIG. 9 is an enlarged view showing a fracture surface of the magnet piece, FIG. 9A shows before peeling, and FIG. 9B shows after peeling. FIG. 10A is a schematic view showing a state in which the fracture surfaces of the two magnet pieces after peeling are brought into contact with each other, and FIG. 10B is an enlarged view of a range B in FIG.

本実施形態ではやすり６０を用いて破断面３３を剥離させる。磁石固定治具４２によって固定された磁石片３１の破断面３３にやすり６０を摺接させる。やすり６０は破断面３３に平行な上下方向に往復運動させる。破断面３３の表面は粗い凹凸形状となっているので、やすり６０の往復運動によって凸部３６が研削される。また、破断面３３の表層部には多数のクラック３４が点在しているのでやすりがけによってクラック３４を起点として破断面３３の表層部が容易に剥離する。   In this embodiment, the fracture surface 33 is peeled off using a file 60. The file 60 is brought into sliding contact with the fracture surface 33 of the magnet piece 31 fixed by the magnet fixing jig 42. The file 60 is reciprocated in the vertical direction parallel to the fracture surface 33. Since the surface of the fracture surface 33 has a rough uneven shape, the convex portion 36 is ground by the reciprocating motion of the file 60. Further, since many cracks 34 are scattered on the surface layer portion of the fracture surface 33, the surface layer portion of the fracture surface 33 is easily peeled off from the crack 34 by the file.

なおここで、磁石体３０を切断して分割した磁石片３１の切断面にやすりがけを施しても切断面の平滑度を低下させることはできるが、本実施形態のように磁石体３０を破断した方が、破断面３３にクラック３４を生じさせることができるのでやすりがけが容易である。また、破断面３３は凹凸形状になっているので凸部３６を研削するだけでよく、その分やすりがけ処理が容易になる。   Here, the smoothness of the cut surface can be reduced even if the cut surface of the magnet piece 31 divided by cutting the magnet body 30 is sanded, but the magnet body 30 is broken as in this embodiment. Since the crack 34 can be generated in the fractured surface 33, the filing is easy. Further, since the fractured surface 33 has an uneven shape, it is only necessary to grind the convex portion 36, and the filing process is facilitated accordingly.

やすりがけ後の磁石片３１の破断面３３同士を当接させると剥離した部分において破断面３３間にクリアランス３５が生じる。すなわち、一方の面の凸部３６が研削されることで当該凸部３６と他方の面の凹部３７との間にクリアランス３５が生じる。なお、やすりがけは当接する破断面３３の一方の面のみに施してもよいし、両方の面に施してもよい。両方の面に施すことでより確実に磁石片３１間にクリアランス３５を生じさせることができる。   When the fractured surfaces 33 of the magnet pieces 31 after filing are brought into contact with each other, a clearance 35 is generated between the fractured surfaces 33 in the peeled portion. That is, the clearance 35 is generated between the convex portion 36 and the concave portion 37 on the other surface by grinding the convex portion 36 on one surface. Note that the file may be applied only to one surface of the fractured surface 33 in contact, or to both surfaces. By applying to both surfaces, the clearance 35 can be generated between the magnet pieces 31 more reliably.

これにより、磁石片３１間の接触面積が低下して接触抵抗が増大するので、磁石片３１の集合体である磁石体３０の発熱抑制効果が向上する。なお、クリアランス３５はやすりがけの強さ、時間、又はやすり６０の粒度を変えることで調整され、例えば１２０μｍ以下となるように設定される。   Thereby, since the contact area between the magnet pieces 31 decreases and the contact resistance increases, the heat generation suppressing effect of the magnet body 30 that is an aggregate of the magnet pieces 31 is improved. The clearance 35 is adjusted by changing the strength of the file, the time, or the particle size of the file 60, and is set to be 120 μm or less, for example.

やすりがけの時間については例えば図１１を参照して設定する。図１１は、やすりがけの時間と磁石片３１間の接触抵抗との関係を示すテーブルである。図１１に示すように磁石片３１間の接触抵抗はやすりがけの時間が長いほど大きくなるので、所望の接触抵抗となるようにやすりがけの時間が設定される。   The filing time is set with reference to FIG. 11, for example. FIG. 11 is a table showing the relationship between the sanding time and the contact resistance between the magnet pieces 31. As shown in FIG. 11, the contact resistance between the magnet pieces 31 increases as the filing time increases, so the filing time is set so as to obtain a desired contact resistance.

以上のように、破断分割された磁石片３１の破断面３３の表層部を研削及び剥離させた後、複数の磁石片３１を破断面３３同士が当接するように一列に配置して一体的に結合することで界磁極用磁石体３０が形成される。   As described above, after grinding and peeling off the surface layer portion of the fracture surface 33 of the fractured and divided magnet piece 31, a plurality of magnet pieces 31 are arranged in a row so that the fracture surfaces 33 are in contact with each other. The field pole magnet body 30 is formed by coupling.

以上のように本実施形態では、磁石片３１の破断面３３を研削することで剥離させるので、破断面３３の表層部をクラック３４を起点としてより確実に剥離させることができる。よって、磁石片３１間の接触面積を低下させることができ、接触抵抗を増大させて磁石体３０の発熱抑制効果を向上させることができる。   As described above, in the present embodiment, since the fracture surface 33 of the magnet piece 31 is separated by grinding, the surface layer portion of the fracture surface 33 can be more reliably separated from the crack 34 as a starting point. Therefore, the contact area between the magnet pieces 31 can be reduced, the contact resistance can be increased, and the heat generation suppressing effect of the magnet body 30 can be improved.

また、破断面３３を研削することにより破断面３３の凸部３６を削ることができるので、当接する破断面３３間により確実にクリアランス３５を形成することができ、磁石片３１間の接触抵抗を増大させて磁石体３０の発熱抑制効果を向上させることができる。   Moreover, since the convex part 36 of the torn surface 33 can be shaved by grinding the torn surface 33, the clearance 35 can be reliably formed between the torn surfaces 33 to contact, and the contact resistance between the magnet pieces 31 can be reduced. The heat generation suppressing effect of the magnet body 30 can be improved by increasing it.

以上説明した実施形態に限定されることなく、その技術的思想の範囲内において種々の変形や変更が可能である。   The present invention is not limited to the embodiment described above, and various modifications and changes can be made within the scope of the technical idea.

例えば、第１実施形態ではショットブラスト５０を用いて破断面３３を剥離させているが、破断面３３の表面を剥離させることができるものであればよく、例えばエアーブラストなどを用いてもよい。   For example, in the first embodiment, the fracture surface 33 is peeled off using the shot blast 50, but any material that can peel the surface of the fracture surface 33 may be used. For example, air blast may be used.

また、第２実施形態ではやすりがけによって破断面３３を研削しているが、破断面３３の表面を研削できるものであればよく、例えばカップブラシなどを用いてもよい。   Further, in the second embodiment, the fracture surface 33 is ground by sanding, but any material that can grind the surface of the fracture surface 33 may be used. For example, a cup brush or the like may be used.

Ａ 永久磁石型電動機
１０ ステータ
２０ ロータ
３０ 界磁極用磁石体
３１ 磁石片
４０ 磁石分割治具
５０ ショットブラスト
６０ やすり A Permanent magnet type motor 10 Stator 20 Rotor 30 Field pole magnet body 31 Magnet piece 40 Magnet split jig 50 Shot blast 60 File

Claims (4)

永久磁石型電動機のロータ又はステータに配設される界磁極用磁石体の製造方法であって、
前記磁石体を破断することで複数の磁石片に分割するステップと、
前記分割するステップによって分割された前記磁石片の破断面の表層部を剥離させるステップと、
前記剥離させるステップによって前記表層部を剥離させた複数の前記磁石片を、前記破断面が互いに当接するように一列に一体的に結合するステップと、
を含むことを特徴とする界磁極用磁石体の製造方法。 A method of manufacturing a field pole magnet body disposed on a rotor or stator of a permanent magnet type electric motor,
Dividing the magnet body into a plurality of magnet pieces by breaking the magnet body;
Peeling the surface layer portion of the fracture surface of the magnet piece divided by the dividing step;
A plurality of the magnet pieces from which the surface layer portion has been peeled off by the step of peeling off, and a step of integrally joining in a row such that the fracture surfaces are in contact with each other;
A method of manufacturing a field pole magnet body comprising: 前記剥離させるステップは、前記分割するステップによって分割された前記磁石片の破断面にブラスト処理を施すことによって前記磁石片の表層部を剥離させることを特徴とする請求項１に記載の界磁極用磁石体の製造方法。   2. The field pole according to claim 1, wherein in the step of peeling, a surface layer portion of the magnet piece is peeled off by performing a blasting process on a fracture surface of the magnet piece divided in the dividing step. Manufacturing method of magnet body. 前記剥離させるステップは、前記分割するステップによって分割された前記磁石片の破断面を研削することで破断面の表層部を剥離させることを特徴とする請求項１又は２に記載の界磁極用磁石体の製造方法。   3. The field pole magnet according to claim 1, wherein in the step of separating, the surface layer portion of the fracture surface is separated by grinding the fracture surface of the magnet piece divided in the division step. Body manufacturing method. 永久磁石型電動機において、請求項１から３までのいずれか１項に記載の製造方法によって製造された界磁極用磁石体がロータ又はステータに配設されることを特徴とする永久磁石型電動機。   A permanent magnet type electric motor, wherein a field pole magnet body manufactured by the manufacturing method according to any one of claims 1 to 3 is disposed on a rotor or a stator.
JP2009098827A 2009-04-15 2009-04-15 Method of manufacturing field pole magnet body and permanent magnet motor Expired - Fee Related JP5428482B2 (en)

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