JP5869306B2 - Rotor and motor - Google Patents
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- JP5869306B2 JP5869306B2 JP2011247668A JP2011247668A JP5869306B2 JP 5869306 B2 JP5869306 B2 JP 5869306B2 JP 2011247668 A JP2011247668 A JP 2011247668A JP 2011247668 A JP2011247668 A JP 2011247668A JP 5869306 B2 JP5869306 B2 JP 5869306B2
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Description
本発明は、ロータ及びモータに関するものである。 The present invention relates to a rotor and a motor.
モータに使用されるロータとしては、周方向に複数の爪状磁極をそれぞれ有して組み合わされるロータコアを備え、それらの間に界磁磁石を配置して各爪状磁極を交互に異なる磁極に機能させる所謂永久磁石界磁のランデル型構造のロータがある（例えば、特許文献１参照）。 The rotor used in the motor has a rotor core that has a plurality of claw-shaped magnetic poles in the circumferential direction and is combined, and field magnets are arranged between them to function each claw-shaped magnetic pole as a different magnetic pole alternately There is a so-called permanent magnet field rundel-type rotor (see, for example, Patent Document 1).
ところで、上記のようなロータの回転位置検出を行う場合、ロータに別途センサ用磁石を配置するため、部品点数の増加の虞がある。
本発明は、上記課題を解決するためになされたものであって、その目的は、部品点数を抑えることができるロータ及びモータを提供することにある。
By the way, when the rotational position of the rotor is detected as described above, a sensor magnet is separately arranged on the rotor, which may increase the number of components.
The present invention has been made to solve the above-described problems, and an object thereof is to provide a rotor and a motor that can suppress the number of parts.
上記課題を解決するために、請求項１に記載の発明は、略円盤状の第１コアベースの外周部に、等間隔に複数の第１爪状磁極が径方向外側に突出されるとともに軸方向に延出形成された第１ロータコアと、略円盤状の第２コアベースの外周部に、等間隔に複数の第２爪状磁極が径方向外側に突出されるとともに軸方向に延出形成され、前記各第２爪状磁極がそれぞれ対応する前記第１ロータコアの各第１爪状磁極間に配置された第２ロータコアと、前記第１コアベースと第２コアベースとの軸方向の間に配置され、前記軸方向に磁化されることで、前記第１爪状磁極を第１の磁極として機能させ、前記第２爪状磁極を第２の磁極として機能させる界磁磁石と、を備えたロータであって、前記第１爪状磁極と前記第２爪状磁極との周方向の間に配置されるとともに前記第１及び第２爪状磁極と同じ極極となるように磁化された補助磁石と、前記第１及び第２爪状磁極の背面に配置されるとともに前記第１及び第２の磁極と同極性が径方向外側となるように磁化された補助磁石の少なくとも一方を１つ以上備え、前記補助磁石は、前記第１及び第２コアベースの少なくとも一方の軸方向端面よりも突出させるように配置されることをその要旨とする。 In order to solve the above-mentioned problem, the invention according to claim 1 is characterized in that a plurality of first claw-shaped magnetic poles are projected radially outward at equal intervals on the outer periphery of the substantially disk-shaped first core base. A plurality of second claw-shaped magnetic poles protrude outward in the radial direction and extend in the axial direction at equal intervals on the outer periphery of the first rotor core extending in the direction and the substantially disk-shaped second core base. A second rotor core disposed between the first claw-shaped magnetic poles of the first rotor core to which each of the second claw-shaped magnetic poles corresponds, and between the first core base and the second core base in the axial direction. And a field magnet that is magnetized in the axial direction so that the first claw-shaped magnetic pole functions as a first magnetic pole and the second claw-shaped magnetic pole functions as a second magnetic pole. A rotor between the circumferential direction of the first claw-shaped magnetic pole and the second claw-shaped magnetic pole. And an auxiliary magnet magnetized so as to be the same pole as the first and second claw-shaped magnetic poles, and disposed on the back surface of the first and second claw-shaped magnetic poles and the first and second claw-shaped magnetic poles At least one auxiliary magnet magnetized so that the same polarity as the magnetic pole is radially outward is provided, and the auxiliary magnet protrudes from at least one axial end surface of the first and second core bases. The gist of the arrangement is as follows.
この発明では、第１爪状磁極と第２爪状磁極との周方向の間に配置されるとともに第１及び第２爪状磁極と同じ極極となるように磁化された補助磁石と、第１及び第２爪状磁極の背面に配置されるとともに第１及び第２の磁極と同極性が径方向外側となるように磁化された補助磁石の少なくとも一方を１つ以上備える。補助磁石は、第１及び第２コアベースの少なくとも一方の軸方向端面よりも突出させるように配置されるため、例えばこの突出される補助磁石と軸方向において対向する検出センサを配置することで、ロータに別途センサ用磁石を設けることなく、ロータの回転位置検出を行うことが可能となる。これにより、部品点数を抑えることができる。 In the present invention, the auxiliary magnet that is disposed between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole and is magnetized so as to have the same polar pole as the first and second claw-shaped magnetic poles, And at least one auxiliary magnet that is disposed on the back surface of the second claw-shaped magnetic pole and is magnetized so that the same polarity as the first and second magnetic poles is radially outward. Since the auxiliary magnet is arranged so as to protrude from at least one axial end face of the first and second core bases, for example, by arranging a detection sensor facing the protruding auxiliary magnet in the axial direction, It is possible to detect the rotational position of the rotor without providing a separate sensor magnet on the rotor. Thereby, the number of parts can be suppressed.
請求項２に記載の発明は、請求項１に記載のロータにおいて、前記補助磁石は、前記第１爪状磁極と前記第２爪状磁極との周方向の間に配置され、前記第１及び第２爪状磁極と同じ極極となるように磁化される極間磁石であることをその要旨とする。 According to a second aspect of the present invention, in the rotor according to the first aspect, the auxiliary magnet is disposed between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole in the circumferential direction. The gist of the invention is that it is an interpole magnet that is magnetized so as to have the same pole as the second claw-shaped magnetic pole.
この発明では、第１爪状磁極と第２爪状磁極との周方向の間に配置され、第１及び第２爪状磁極と同じ極極となるように磁化される極間磁石にてセンサ用磁石を兼用することができる。また、極間磁石を設けることで、各爪状磁極間で発生しうる漏れ磁束を低減させてモータ出力の向上を図ることができる。 In this invention, it is arranged between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole in the circumferential direction, and is used for the sensor by an interpole magnet that is magnetized so as to have the same pole pole as the first and second claw-shaped magnetic poles. A magnet can also be used. Further, by providing the interpole magnet, the leakage magnetic flux that can be generated between the claw-shaped magnetic poles can be reduced to improve the motor output.
請求項３に記載の発明は、請求項１に記載のロータにおいて、前記補助磁石は、前記第１及び第２爪状磁極の背面に配置されるとともに前記第１及び第２の磁極と同極性が径方向外側となるように磁化された背面磁石であることをその要旨とする。 According to a third aspect of the present invention, in the rotor according to the first aspect, the auxiliary magnet is disposed on the back surface of the first and second claw-shaped magnetic poles and has the same polarity as the first and second magnetic poles. The gist of the present invention is that it is a back magnet magnetized so as to be radially outward.
この発明では、第１及び第２爪状磁極の背面に配置されるとともに前記第１及び第２の磁極と同極性が径方向外側となるように磁化された背面磁石にてセンサ用磁石を兼用することができる。また、背面磁石を設けることで、第１及び第２爪状磁極のそれぞれと界磁磁石との間で発生しうる漏れ磁束を低減させて、モータ出力の向上を図ることができる。 In this invention, the sensor magnet is also used by the back magnet which is arranged on the back surfaces of the first and second claw-shaped magnetic poles and is magnetized so that the same polarity as the first and second magnetic poles is radially outward. can do. Further, by providing the back magnet, it is possible to reduce the leakage magnetic flux that can be generated between each of the first and second claw-shaped magnetic poles and the field magnet, thereby improving the motor output.
請求項４に記載の発明は、請求項１〜３のいずれか一項に記載のロータに備えられる前記補助磁石と対向する検出センサとを備えたことをその要旨とする。
この発明では、部品点数を抑えることができるモータを提供することができる。
The gist of the invention described in claim 4 is that it includes a detection sensor opposed to the auxiliary magnet provided in the rotor according to any one of claims 1 to 3.
According to the present invention, a motor capable of suppressing the number of parts can be provided.
従って、上記記載の発明によれば、部品点数を抑えることができるロータ及びモータを提供することができる。 Therefore, according to the above-described invention, it is possible to provide a rotor and a motor that can suppress the number of parts.
以下、本発明を具体化した一実施形態を図面に従って説明する。
図１に示すように、モータ１のモータケース２は、有底筒状に形成された筒状ハウジング３と、該筒状ハウジング３のフロント側（図１中、左側）の開口部を閉塞するフロントエンドプレート４とを有している。また、筒状ハウジング３のリア側（図１中、右側）の端部には、回路基板等の電源回路を収容した回路収容ボックス５が取着されている。
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
As shown in FIG. 1, a motor case 2 of a motor 1 closes a cylindrical housing 3 formed in a bottomed cylindrical shape and an opening on the front side (left side in FIG. 1) of the cylindrical housing 3. And a front end plate 4. A circuit housing box 5 that houses a power circuit such as a circuit board is attached to an end of the cylindrical housing 3 on the rear side (right side in FIG. 1).
筒状ハウジング３の内周面にはステータ６が固定されている。ステータ６は、径方向内側に延びる複数のティースを有する電機子コア７と、電機子コア７のティースに巻装されたセグメントコンダクタ（ＳＣ）巻線８とを有する。モータ１のロータ１１は回転軸１２を有し、ステータ６の内側に配置されている。回転軸１２は非磁性体の金属シャフトであって、筒状ハウジング３の底部３ａ及びフロントエンドプレート４に支持された軸受１３，１４により回転可能に支持されている。 A stator 6 is fixed to the inner peripheral surface of the cylindrical housing 3. The stator 6 includes an armature core 7 having a plurality of teeth extending radially inward, and a segment conductor (SC) winding 8 wound around the teeth of the armature core 7. The rotor 11 of the motor 1 has a rotating shaft 12 and is disposed inside the stator 6. The rotating shaft 12 is a non-magnetic metal shaft, and is rotatably supported by bearings 13 and 14 supported by the bottom 3 a of the cylindrical housing 3 and the front end plate 4.
ロータ１１は、図２及び図３に示すように、第１及び第２ロータコア２１，２２と、界磁磁石としての環状磁石２３と、第１及び第２背面補助磁石２４，２５と、第１及び第２極間磁石２６，２７とを備える。尚、図２及び図３中の実線で示す矢印は各磁石２３，２４，２５，２６，２７の磁化方向（Ｓ極からＮ極向き）を示している。 2 and 3, the rotor 11 includes first and second rotor cores 21 and 22, an annular magnet 23 as a field magnet, first and second back auxiliary magnets 24 and 25, And second inter-pole magnets 26 and 27. 2 and 3 indicate the magnetization directions (from the S pole to the N pole) of the magnets 23, 24, 25, 26, and 27.
図２に示すように、第１ロータコア２１は、略円盤状の第１コアベース２１ａの外周部に、等間隔に複数（本実施形態では５つ）の第１爪状磁極２１ｂが径方向外側に突出されるとともに軸方向に延出形成されている。第１爪状磁極２１ｂの周方向端面２１ｃ，２１ｄは径方向に延びる（軸方向から見て径方向に対して傾斜していない）平坦面とされ、第１爪状磁極２１ｂは軸直交方向断面が扇形状とされている。各第１爪状磁極２１ｂの周方向の角度、即ち前記周方向端面２１ｃ，２１ｄ間の角度は、周方向に隣り合う第１爪状磁極２１ｂ同士の隙間の角度より小さく設定されている。 As shown in FIG. 2, the first rotor core 21 has a plurality of (five in the present embodiment) first claw-shaped magnetic poles 21b on the outer periphery in the radial direction on the outer periphery of a substantially disc-shaped first core base 21a. And extends in the axial direction. The circumferential end surfaces 21c and 21d of the first claw-shaped magnetic pole 21b are flat surfaces extending in the radial direction (not inclined with respect to the radial direction when viewed from the axial direction), and the first claw-shaped magnetic pole 21b has a cross section perpendicular to the axis. Has a fan shape. The circumferential angle of each first claw-shaped magnetic pole 21b, that is, the angle between the circumferential end faces 21c and 21d is set smaller than the angle of the gap between the first claw-shaped magnetic poles 21b adjacent in the circumferential direction.
図２及び図３に示すように、第２ロータコア２２は、第１ロータコア２１と同形状であって、略円盤状の第２コアベース２２ａの外周部に、等間隔に複数の第２爪状磁極２２ｂが径方向外側に突出されるとともに軸方向に延出形成されている。第２爪状磁極２２ｂの周方向端面２２ｃ，２２ｄは径方向に延びる平坦面とされ、第２爪状磁極２２ｂは軸直交方向断面が扇形状とされている。各第２爪状磁極２２ｂの周方向の角度、即ち前記周方向端面２２ｃ，２２ｄ間の角度は、周方向に隣り合う第２爪状磁極２２ｂ同士の隙間の角度より小さく設定されている。そして、第２ロータコア２２は、前記各第２爪状磁極２２ｂがそれぞれ対応する各第１爪状磁極２１ｂ間に配置されるようにして、第１コアベース２１ａと第２コアベース２２ａとの軸方向の間に環状磁石２３（図３参照）が配置（挟持）されるようにして第１ロータコア２１に対して組み付けられる。このとき、第１爪状磁極２１ｂの一方の周方向端面２１ｃと第２爪状磁極２２ｂの他方の周方向端面２２ｄとが軸方向に沿って平行をなすように形成されるため、各端面２１ｃ，２２ｄ間の間隙が軸方向に沿って略直線状をなすように形成されることとなる。また、第１爪状磁極２１ｂの他方の周方向端面２１ｄと第２爪状磁極２２ｂの一方の周方向端面２２ｃとが軸方向に沿って平行をなすように形成されるため、各端面２１ｄ，２２ｃ間の間隙が軸方向に沿って略直線状をなすように形成されることとなる。 As shown in FIGS. 2 and 3, the second rotor core 22 has the same shape as the first rotor core 21, and has a plurality of second claw-like shapes on the outer periphery of the substantially disk-shaped second core base 22 a at equal intervals. The magnetic pole 22b protrudes radially outward and extends in the axial direction. The circumferential end surfaces 22c and 22d of the second claw-shaped magnetic pole 22b are flat surfaces extending in the radial direction, and the second claw-shaped magnetic pole 22b has a fan-shaped cross section in the direction perpendicular to the axis. The circumferential angle of each second claw-shaped magnetic pole 22b, that is, the angle between the circumferential end faces 22c and 22d is set smaller than the angle of the gap between the second claw-shaped magnetic poles 22b adjacent in the circumferential direction. The second rotor core 22 is arranged between the first core base 21a and the second core base 22a such that the second claw-shaped magnetic poles 22b are disposed between the corresponding first claw-shaped magnetic poles 21b. The annular magnet 23 (see FIG. 3) is arranged (clamped) between the directions, and is assembled to the first rotor core 21. At this time, since one circumferential end face 21c of the first claw-shaped magnetic pole 21b and the other circumferential end face 22d of the second claw-shaped magnetic pole 22b are formed in parallel along the axial direction, each end face 21c is formed. , 22d is formed so as to be substantially linear along the axial direction. Further, since the other circumferential end face 21d of the first claw-shaped magnetic pole 21b and one circumferential end face 22c of the second claw-shaped magnetic pole 22b are formed so as to be parallel along the axial direction, each end face 21d, The gap between 22c is formed so as to be substantially linear along the axial direction.
図３に示すように、環状磁石２３は、その外径が第１及び第２コアベース２１ａ，２２ａの外径と同じに設定され、第１爪状磁極２１ｂを第１の磁極（本実施形態ではＮ極）として機能させ、第２爪状磁極２２ｂを第２の磁極（本実施形態ではＳ極）として機能させるように、軸方向に磁化されている。 As shown in FIG. 3, the outer diameter of the annular magnet 23 is set to be the same as the outer diameter of the first and second core bases 21a and 22a, and the first claw-shaped magnetic pole 21b is used as the first magnetic pole (this embodiment). The second claw-shaped magnetic pole 22b is magnetized in the axial direction so as to function as a second magnetic pole (S pole in the present embodiment).
各第１爪状磁極２１ｂの背面２１ｅ（径方向内側の面）と第２コアベース２２ａの外周面２２ｆとの間には、第１背面補助磁石２４が配置されている。また、各第２爪状磁極２２ｂの背面２２ｅには、第１爪状磁極２１ｂと同様に、第２背面補助磁石２５が配置されている。第１背面補助磁石２４は、その軸直交方向断面が扇形状とされ、第１爪状磁極２１ｂの背面２１ｅに当接する側と第１コアベース２１ａの外周面２１ｆに当接する側とがＮ極となるように磁化されている。そして、第２背面補助磁石２５は、第２コアベース２２ａの外周面２２ｆに当接する側と第２爪状磁極２２ｂの背面２２ｅに当接する側とが同第２コアベース２２ａと同極のＳ極となるように磁化されている。 A first back auxiliary magnet 24 is arranged between the back surface 21e (radially inner surface) of each first claw-shaped magnetic pole 21b and the outer peripheral surface 22f of the second core base 22a. Similarly to the first claw-shaped magnetic pole 21b, a second back auxiliary magnet 25 is disposed on the back surface 22e of each second claw-shaped magnetic pole 22b. The first back auxiliary magnet 24 has a fan-shaped cross section in the direction perpendicular to the axis, and the side that contacts the back surface 21e of the first claw-shaped magnetic pole 21b and the side that contacts the outer peripheral surface 21f of the first core base 21a have N poles. It is magnetized so that The second back auxiliary magnet 25 has the same polarity as that of the second core base 22a and the side contacting the outer peripheral surface 22f of the second core base 22a and the side contacting the back surface 22e of the second claw-shaped magnetic pole 22b. Magnetized to be poles.
各第１及び第２背面補助磁石２４，２５は、環状磁石２３が配置されるロータ１１の軸方向位置で互いに軸方向に重なるように、言い換えると、ロータ１１の両面から環状磁石２３が配置される軸方向位置に達するまで配置されるように軸方向の長さが設定されている。 The first and second back auxiliary magnets 24 and 25 are arranged so that they overlap each other in the axial direction at the axial position of the rotor 11 where the annular magnet 23 is arranged, in other words, the annular magnets 23 are arranged from both surfaces of the rotor 11. The length in the axial direction is set so as to be arranged until reaching the axial position.
また、第２背面補助磁石２５は、図３に示すように、第１コアベース２１ａの軸方向外側面２１ｇと第２爪状磁極２２ｂの先端面２２ｈよりも軸方向に突出するように構成される。 Further, as shown in FIG. 3, the second back auxiliary magnet 25 is configured to protrude in the axial direction from the axially outer side surface 21g of the first core base 21a and the tip end surface 22h of the second claw-shaped magnetic pole 22b. The
また、図２に示すように、第１爪状磁極２１ｂと第２爪状磁極２２ｂとの周方向の間には、第１及び第２極間磁石２６，２７が配置されている。より詳しくは、本実施形態の第１極間磁石２６は、第１爪状磁極２１ｂの一方の周方向端面２１ｄと、第２爪状磁極２２ｂの他方の周方向端面２２ｅとの間に配置されている。そして、もう一方の第２極間磁石２６は、第１爪状磁極２１ｂの他方の周方向端面２１ｅと、第２爪状磁極２２ｂの一方の周方向端面２２ｄとの間に配置されている。各第１及び第２極間磁石２６，２７は、第１及び第２爪状磁極２１ｂ，２２ｂとそれぞれ同極性が対向するように（第１爪状磁極２１ｂ側がＮ極で、第２爪状磁極２２ｂ側がＳ極となるように）周方向に磁化されている。また、第１及び第２極間磁石２６，２７の径方向内側である回転軸１２側には、漏れ磁束防止の空隙Ｋが形成される。 As shown in FIG. 2, first and second interpole magnets 26 and 27 are arranged between the circumferential directions of the first claw-shaped magnetic pole 21b and the second claw-shaped magnetic pole 22b. More specifically, the first inter-pole magnet 26 of the present embodiment is disposed between one circumferential end surface 21d of the first claw-shaped magnetic pole 21b and the other circumferential end surface 22e of the second claw-shaped magnetic pole 22b. ing. The other second interpole magnet 26 is disposed between the other circumferential end surface 21e of the first claw-shaped magnetic pole 21b and one circumferential end surface 22d of the second claw-shaped magnetic pole 22b. Each of the first and second interpole magnets 26 and 27 has the same polarity as the first and second claw-shaped magnetic poles 21b and 22b (the first claw-shaped magnetic pole 21b side is N-pole, and the second claw-shaped It is magnetized in the circumferential direction (so that the magnetic pole 22b side becomes the S pole). In addition, a gap K for preventing leakage magnetic flux is formed on the rotary shaft 12 side, which is the radially inner side of the first and second interpole magnets 26 and 27.
ここで、本実施形態のモータ１には、前記ロータ１１の回転位置を検出するための検出センサＳを備えている。この検出センサＳは、図１及び図３に示す支持部材Ｓｉに支持されるものであり、前記ロータ１１を回転させた際に、第２背面補助磁石２５が通る軌道上と軸方向に対向するように配置されている。そして、検出センサＳは、前記第２背面補助磁石２５の磁気を検出してロータ１１の回転位置を検出するようになっている。また、この検出センサＳは、図示しない制御回路と電気的に接続され、前記ロータ１１の回転位置情報を出力する。このため、制御回路はその回転位置情報に基づいてロータ１１及びモータ１の回転制御が可能となっている。 Here, the motor 1 of this embodiment includes a detection sensor S for detecting the rotational position of the rotor 11. This detection sensor S is supported by the support member Si shown in FIGS. 1 and 3 and, when the rotor 11 is rotated, opposes on the track through which the second back auxiliary magnet 25 passes in the axial direction. Are arranged as follows. The detection sensor S detects the rotational position of the rotor 11 by detecting the magnetism of the second back auxiliary magnet 25. The detection sensor S is electrically connected to a control circuit (not shown) and outputs rotational position information of the rotor 11. Therefore, the control circuit can control the rotation of the rotor 11 and the motor 1 based on the rotational position information.
上記のように構成されたモータ１は、回路収容ボックス５内の電源回路を介してセグメントコンダクタ（ＳＣ）巻線８に駆動電流が供給されると、ステータ６でロータ１１を回転させるための磁界が発生され、ロータ１１が回転駆動される。 When the drive current is supplied to the segment conductor (SC) winding 8 via the power supply circuit in the circuit housing box 5, the motor 1 configured as described above has a magnetic field for rotating the rotor 11 by the stator 6. Is generated, and the rotor 11 is rotationally driven.
次に、上記のように構成されたモータ１の作用について説明する。
本実施形態のモータ１のロータ１１は、第２背面補助磁石２５が第１コアベース２１ａの軸方向外側面２１ｇと第２爪状磁極２２ｂの先端面２２ｈよりも軸方向に突出するように構成される。そして、第２背面補助磁石２５の回転軌道上において軸方向に対向する検出センサＳが配置される。このため、検出センサＳによって軸方向に突出される第２背面補助磁石２５をセンサ用マグネットとして検出することが可能となり、ロータ１１の回転位置が検出される。
Next, the operation of the motor 1 configured as described above will be described.
The rotor 11 of the motor 1 of the present embodiment is configured such that the second back auxiliary magnet 25 protrudes in the axial direction from the axially outer side surface 21g of the first core base 21a and the tip surface 22h of the second claw-shaped magnetic pole 22b. Is done. And the detection sensor S which opposes an axial direction on the rotation track | orbit of the 2nd back surface auxiliary magnet 25 is arrange | positioned. Therefore, the second back auxiliary magnet 25 protruding in the axial direction by the detection sensor S can be detected as a sensor magnet, and the rotational position of the rotor 11 is detected.
次に、本実施形態の特徴的な効果を記載する。
（１）第１及び第２爪状磁極２１ｂ，２２ｂの背面に配置されるとともに第１及び第２の磁極と同極性が径方向外側となるように磁化された補助磁石としての第１及び第２背面補助磁石２４，２５を備える。第２背面補助磁石２５は、第１コアベース２１ａの軸方向端面としての軸方向外側面２１ｇよりも突出させるように配置されるため、例えばこの突出される第２背面補助磁石２５と軸方向において対向する検出センサＳを配置することで、ロータ１１に別途センサ用磁石を設けることなく、検出センサＳによりロータ１１の回転位置検出を行うことが可能となる。これにより、部品点数を抑えることができる。
Next, characteristic effects of the present embodiment will be described.
(1) First and second auxiliary magnets arranged on the back surfaces of the first and second claw-shaped magnetic poles 21b and 22b and magnetized so that the same polarity as the first and second magnetic poles is radially outward. Two back auxiliary magnets 24 and 25 are provided. Since the second back auxiliary magnet 25 is disposed so as to protrude from the axially outer side surface 21g as the axial end surface of the first core base 21a, for example, in the axial direction with the protruding second back auxiliary magnet 25. By disposing the opposing detection sensor S, the rotation position of the rotor 11 can be detected by the detection sensor S without providing a separate sensor magnet in the rotor 11. Thereby, the number of parts can be suppressed.
（２）また、第１及び第２極間磁石２６，２７を設けることで、各爪状磁極２１ｂ，２２ｂ間で発生しうる漏れ磁束を低減させてモータ出力の向上を図ることができる。
（３）また、第１及び第２背面補助磁石２４，２５を設けることで、第１及び第２爪状磁極のそれぞれと界磁磁石との間で発生しうる漏れ磁束を低減させて、モータ出力の向上を図ることができる。
(2) Further, by providing the first and second interpole magnets 26 and 27, the leakage magnetic flux that can be generated between the claw-shaped magnetic poles 21b and 22b can be reduced, and the motor output can be improved.
(3) Also, by providing the first and second back auxiliary magnets 24 and 25, the leakage magnetic flux that can be generated between each of the first and second claw-shaped magnetic poles and the field magnet can be reduced, and the motor The output can be improved.
尚、本発明の実施形態は、以下のように変更してもよい。
・上記実施形態では、第２背面補助磁石２５を第１コアベース２１ａの軸方向外側面２１ｇ（ロータコア２１の端面）よりも軸方向に突出するように構成したが、これに限らない。例えば第１背面補助磁石２４を第２コアベース２２ａの軸方向外側面２２ｇよりも軸方向に突出するように構成してもよい。この場合、検出センサＳは、ロータ１１を回転させた際に第１背面補助磁石２４の回転軌道上において軸方向に対向するように配置する。
In addition, you may change embodiment of this invention as follows.
In the above-described embodiment, the second back auxiliary magnet 25 is configured to protrude in the axial direction from the axially outer side surface 21g (end surface of the rotor core 21) of the first core base 21a, but is not limited thereto. For example, the first back auxiliary magnet 24 may be configured to protrude in the axial direction from the axially outer side surface 22g of the second core base 22a. In this case, when the rotor 11 is rotated, the detection sensor S is disposed so as to face the axial direction on the rotation trajectory of the first back auxiliary magnet 24.
また、第１及び第２背面補助磁石２４，２５ではなく、図４に示すように第１及び第２極間磁石２６，２７を第１コアベース２１ａの軸方向外側面２１ｇ又は第２コアベース２２ａの軸方向外側面２２ｇよりも突出するように構成してもよい。この場合、検出センサＳは、ロータ１１を回転させた際に第１及び第２極間磁石２６，２７の回転軌道上において軸方向に対向するように配置する。 Further, instead of the first and second back auxiliary magnets 24 and 25, the first and second interpole magnets 26 and 27 are connected to the axially outer side surface 21g of the first core base 21a or the second core base as shown in FIG. You may comprise so that it may protrude rather than the axial direction outer surface 22g of 22a. In this case, when the rotor 11 is rotated, the detection sensor S is disposed so as to face the axial direction on the rotation trajectory of the first and second interpole magnets 26 and 27.
また、図５に示すように、第２背面補助磁石２５に加えて、第１及び第２極間磁石２６，２７を第１コアベース２１ａの軸方向外側面２１ｇ又は第２コアベース２２ａの軸方向外側面２２ｇよりも突出するように構成してもよい。 Further, as shown in FIG. 5, in addition to the second back auxiliary magnet 25, the first and second interpole magnets 26 and 27 are connected to the axially outer side surface 21g of the first core base 21a or the axis of the second core base 22a. You may comprise so that it may protrude rather than the direction outer side surface 22g.
また、第１及び第２背面補助磁石２４，２５ではなく、図６に示すように第１及び第２極間磁石２６，２７のいずれか一方を第１コアベース２１ａの軸方向外側面２１ｇ又は第２コアベース２２ａの軸方向外側面２２ｇよりも突出するように構成してもよい。この場合、検出センサＳは、ロータ１１を回転させた際に第１及び第２極間磁石２６，２７の回転軌道上において軸方向に対向するように配置する。 Further, instead of the first and second back auxiliary magnets 24 and 25, either one of the first and second interpole magnets 26 and 27 is attached to the axial outer surface 21g of the first core base 21a as shown in FIG. You may comprise so that it may protrude rather than the axial direction outer surface 22g of the 2nd core base 22a. In this case, when the rotor 11 is rotated, the detection sensor S is disposed so as to face the axial direction on the rotation trajectory of the first and second interpole magnets 26 and 27.
・上記実施形態では、第１及び第２ロータコア２１，２２間に界磁磁石として１つの環状磁石２３を設けたが、これに限らない。例えば、複数に分割した永久磁石を回転軸１２の周囲で対のロータコア２１，２２のコアベース２１ａ，２２ａの軸方向間に配置する構成を採用してもよい。 In the above embodiment, one annular magnet 23 is provided as a field magnet between the first and second rotor cores 21 and 22, but this is not restrictive. For example, a configuration may be adopted in which a plurality of permanent magnets are arranged between the core bases 21 a and 22 a of the pair of rotor cores 21 and 22 around the rotation shaft 12.
・上記実施形態では、特に言及していないが、第１及び第２ロータコア２１，２２と電機子コア７は、例えば磁性金属板材の積層や、磁性粉体の成形にて構成してもよい。 In the above embodiment, although not particularly mentioned, the first and second rotor cores 21 and 22 and the armature core 7 may be configured by, for example, lamination of magnetic metal plate materials or molding of magnetic powder.
１…モータ、１１…ロータ、２１…第１ロータコア、２１ａ…第１コアベース、２１ｂ…第１爪状磁極、２１ｅ，２２ｅ…背面、２２…第２ロータコア、２２ａ…第２コアベース、２２ｂ…第２爪状磁極、２４…補助磁石としての第１背面補助磁石、２５…補助磁石としての第２背面補助磁石、２６…補助磁石としての第１極間磁石、２７…補助磁石としての第２極間磁石、Ｓ…検出センサ。 DESCRIPTION OF SYMBOLS 1 ... Motor, 11 ... Rotor, 21 ... 1st rotor core, 21a ... 1st core base, 21b ... 1st claw-shaped magnetic pole, 21e, 22e ... Back surface, 22 ... 2nd rotor core, 22a ... 2nd core base, 22b ... 2nd claw-shaped magnetic pole, 24 ... 1st back surface auxiliary magnet as an auxiliary magnet, 25 ... 2nd back surface auxiliary magnet as an auxiliary magnet, 26 ... 1st interpole magnet as an auxiliary magnet, 27 ... 2nd as an auxiliary magnet Magnet between electrodes, S ... detection sensor.
Claims (4)
略円盤状の第２コアベースの外周部に、等間隔に複数の第２爪状磁極が径方向外側に突出されるとともに軸方向に延出形成され、前記各第２爪状磁極がそれぞれ対応する前記第１ロータコアの各第１爪状磁極間に配置された第２ロータコアと、
前記第１コアベースと第２コアベースとの軸方向の間に配置され、前記軸方向に磁化されることで、前記第１爪状磁極を第１の磁極として機能させ、前記第２爪状磁極を第２の磁極として機能させる界磁磁石と、
を備えたロータであって、
前記第１爪状磁極と前記第２爪状磁極との周方向の間に配置されるとともに前記第１及び第２爪状磁極と同じ極極となるように磁化された補助磁石と、前記第１及び第２爪状磁極の背面に配置されるとともに前記第１及び第２の磁極と同極性が径方向外側となるように磁化された補助磁石の少なくとも一方を１つ以上備え、
前記補助磁石は、前記第１及び第２コアベースの少なくとも一方の軸方向端面よりも突出させるように配置されることを特徴とするロータ。 A first rotor core having a plurality of first claw-shaped magnetic poles protruding radially outward and extending in the axial direction at an outer peripheral portion of a substantially disc-shaped first core base;
A plurality of second claw-shaped magnetic poles project radially outward and extend in the axial direction on the outer periphery of the substantially disk-shaped second core base, and correspond to each of the second claw-shaped magnetic poles. A second rotor core disposed between the first claw-shaped magnetic poles of the first rotor core;
The first claw-shaped magnetic pole is arranged between the first core base and the second core base and is magnetized in the axial direction so that the first claw-shaped magnetic pole functions as the first magnetic pole, and the second claw-shaped A field magnet that causes the magnetic pole to function as a second magnetic pole;
A rotor with
An auxiliary magnet disposed between the first claw-shaped magnetic pole and the circumferential direction of the second claw-shaped magnetic pole and magnetized so as to have the same pole as the first and second claw-shaped magnetic poles; And at least one of auxiliary magnets arranged on the back surface of the second claw-shaped magnetic pole and magnetized so that the same polarity as the first and second magnetic poles is radially outward,
The rotor is characterized in that the auxiliary magnet is disposed so as to protrude from at least one axial end face of the first and second core bases.
前記補助磁石は、前記第１爪状磁極と前記第２爪状磁極との周方向の間に配置され、前記第１及び第２爪状磁極と同じ極極となるように磁化される極間磁石であることを特徴とするロータ。 The rotor according to claim 1, wherein
The auxiliary magnet is disposed between the first claw-shaped magnetic pole and the second claw-shaped magnetic pole in the circumferential direction, and is magnetized so as to have the same polar pole as the first and second claw-shaped magnetic poles. Rotor characterized by being.
前記補助磁石は、前記第１及び第２爪状磁極の背面に配置されるとともに前記第１及び第２の磁極と同極性が径方向外側となるように磁化された背面磁石であることを特徴とするロータ。 The rotor according to claim 1, wherein
The auxiliary magnet is a back magnet that is disposed on the back surfaces of the first and second claw-shaped magnetic poles and is magnetized so that the same polarity as the first and second magnetic poles is radially outward. Rotor.
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| CN201210440788.9A CN103095014B (en) | 2011-10-31 | 2012-10-29 | rotor and motor |
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