JP2012080715A - Motor - Google Patents

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JP2012080715A
JP2012080715A JP2010225660A JP2010225660A JP2012080715A JP 2012080715 A JP2012080715 A JP 2012080715A JP 2010225660 A JP2010225660 A JP 2010225660A JP 2010225660 A JP2010225660 A JP 2010225660A JP 2012080715 A JP2012080715 A JP 2012080715A
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teeth
magnet
magnetic force
motor
side surfaces
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Takuma Nomiyama
琢磨 野見山
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Sinfonia Technology Co Ltd
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Sinfonia Technology Co Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
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    • Y02T10/64Electric machine technologies in electromobility

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Abstract

PROBLEM TO BE SOLVED: To provide a motor that reduces cogging torque.SOLUTION: A motor includes: a plurality of magnet sections 21 and 22 with alternately arranged polarities; and a plurality of teeth 32 that project so as to face the plurality of magnet sections 21 and 22 and that are configured so as to be movable relative to the magnet sections 21 and 22. A tip end of each of the teeth 32 has a magnetic field line leakage promoting portion 132 that allows leakage of magnetic field lines, guided to the tip end of each of the teeth 32, from permanent magnets 21A and 22A, in areas 122 of a rotor 2 where polarities of the permanent magnets 21A and 22A are switched.

Description

本発明は、リニアモータや回転式モータ等のモータに関する。   The present invention relates to a motor such as a linear motor or a rotary motor.

従来、極性が切り替わるように配置された複数の磁石部と、該複数の磁石部に対向するよう突出し、磁石部と相対移動可能に構成された複数のティースとを備えたモータが知られている(例えば、特許文献1参照)。   2. Description of the Related Art Conventionally, there has been known a motor including a plurality of magnet portions arranged so that the polarities are switched and a plurality of teeth protruding so as to face the plurality of magnet portions and configured to be relatively movable with the magnet portions. (For example, refer to Patent Document 1).

特開2007−259513号公報(図3、図4参照)JP 2007-259513 A (see FIGS. 3 and 4)

このようなモータでは、隣り合う磁石部同士の極性が切り替わる領域で、ティースと一方の磁石部との吸引又は反発が他方の磁石部との反発又は吸引に切り替わる。この切り替わり時にコギングが発生するが、コギングは、モータの出力トルクを脈動させるため、なくす、あるいは抑制するのが好ましい。   In such a motor, in a region where the polarities of adjacent magnet portions are switched, attraction or repulsion between the teeth and one magnet portion is switched to repulsion or attraction between the other magnet portion. Cogging occurs at the time of switching, but cogging is preferably eliminated or suppressed because it pulsates the output torque of the motor.

しかし、特許文献1のモータでは、ティースの先端部に形成されている傘部の幅方向(周方向)の両側面が小さいため、磁石部からティースの先端部に導かれる磁力線が傘部で飽和してしまい、ティースの先端部の磁力線の密度が密になってしまう。そのため、ティースの先端部と磁石部との吸引力が大きくなって、コギングが大きくなり、その結果、モータの安定した出力トルクを得ることが困難になる。   However, in the motor of Patent Document 1, since both side surfaces in the width direction (circumferential direction) of the umbrella portion formed at the tip portion of the tooth are small, the lines of magnetic force guided from the magnet portion to the tip portion of the tooth are saturated at the umbrella portion. As a result, the density of the magnetic field lines at the tip of the teeth becomes dense. Therefore, the attraction force between the tip portion of the teeth and the magnet portion is increased, and cogging is increased. As a result, it is difficult to obtain a stable output torque of the motor.

そこで、本発明はかかる状況に鑑みてなされたものであって、その解決しようとするところは、コギングを抑制して安定した出力トルクを得ることができるモータを提供することにある。   Accordingly, the present invention has been made in view of such circumstances, and an object of the invention is to provide a motor that can suppress cogging and obtain a stable output torque.

即ち、本発明のモータは、前述の課題解決のために、極性を交互に配置させた複数の磁石部と、該複数の磁石部に対向するよう突出し、前記磁石部と相対移動可能に構成された複数のティースとを備え、前記ティースの先端部には、隣り合う磁石部同士の極性が切り替わる領域で、磁石部から導かれた磁力線を漏れさせる漏れ磁力線促進部が形成されていることを特徴としている。   That is, in order to solve the above-described problems, the motor of the present invention is configured to be capable of moving relative to the plurality of magnet portions, which are alternately arranged in polarity, projecting so as to face the plurality of magnet portions. A plurality of teeth, and a leading portion of the teeth is formed with a leakage magnetic force line promoting portion for leaking the magnetic force lines led from the magnet portion in a region where the polarities of adjacent magnet portions are switched. It is said.

上記構成によれば、磁石部からティースの先端部に導かれた磁力線を漏れさせる漏れ磁力線促進部が形成されているので、隣り合う磁石部同士の極性が切り替わる領域で、先端部に導かれた磁力線を積極的に漏れさせることができ、先端部での磁束密度を疎にすることができる。よって、ティースと磁石部との間の吸引力(又は反発力)を小さくすることができて、コギングを小さくすることができる。   According to the above configuration, since the leakage magnetic force line promoting portion that leaks the magnetic force line guided from the magnet portion to the tip portion of the tooth is formed, the lead portion is guided to the tip portion in the region where the polarities of the adjacent magnet portions are switched. Magnetic field lines can be actively leaked, and the magnetic flux density at the tip can be made sparse. Therefore, the attractive force (or repulsive force) between the teeth and the magnet portion can be reduced, and the cogging can be reduced.

また、本発明のモータは、前記漏れ磁力線促進部が、前記ティースの突出方向と直交する幅方向の両側面を備え、該両側面は、前記導かれる磁力線の量に応じて大きさが設定されていてもよい。   Further, in the motor of the present invention, the leakage magnetic force line promoting portion includes both side surfaces in the width direction orthogonal to the protruding direction of the teeth, and the size of the both side surfaces is set according to the amount of the magnetic force lines to be guided. It may be.

また、本発明のモータは、前記漏れ磁力線促進部が、前記ティースの突出方向と直交する幅方向の両側面を備え、該両側面は、前記ティースと前記磁石部との間のエアギャップの大きさに応じて大きさが設定されていてもよい。   Further, in the motor of the present invention, the leakage magnetic force line promoting portion includes both side surfaces in the width direction perpendicular to the protruding direction of the teeth, and the both side surfaces have a large air gap between the teeth and the magnet portion. The size may be set accordingly.

本発明によれば、ティースの先端部に導かれる磁石部からの磁力線を漏れさせる漏れ磁力線促進部が形成されているので、隣り合う磁石部同士の極性が切り替わる領域で、先端部に導かれた磁力線を積極的に漏れさせることができ、先端部での磁束密度を疎にすることができる結果、コギングを抑制して安定した出力トルクを得ることができるモータを提供することができる。   According to the present invention, since the leakage magnetic force line promoting portion for leaking the magnetic force lines from the magnet portion guided to the tip portion of the teeth is formed, the polarity is introduced to the tip portion in the region where the polarities of the adjacent magnet portions are switched. As a result of actively leaking the magnetic lines of force and reducing the magnetic flux density at the tip, it is possible to provide a motor that can suppress cogging and obtain a stable output torque.

本発明に係るモータの横断面図である。It is a cross-sectional view of the motor according to the present invention. 図1の要部の拡大図である。It is an enlarged view of the principal part of FIG. 別の形状の永久磁石を備えたモータの要部の拡大図である。It is an enlarged view of the principal part of the motor provided with the permanent magnet of another shape. 別の形状のティースの先端部を示すモータの横断面図である。It is a cross-sectional view of the motor which shows the front-end | tip part of the teeth of another shape. 別の形状のティースの先端部を示すモータの横断面図であるIt is a cross-sectional view of the motor showing the tip of the tooth of another shape (a),(b),(c)は別の形状のティースの先端部を示す横断面図である。(A), (b), (c) is a cross-sectional view which shows the front-end | tip part of the teeth of another shape.

以下、本発明に係るモータの一例であるブラシレスモータを図面に基づいて説明する。このブラシレスモータは、図1に示すように、回転軸であるモータ軸1の軸回りに回転するロータ(可動子)2と、このロータ2の外周を囲むように狭い隙間(エアギャップG)を空けてケーシング(図示せず)に固定されるステータ(固定子)3とを備えている。このブラシレスモータは、ハイブリッド車や電気自動車などに搭載されるモータの負荷試験を行うために、該モータに正確な負荷を与えるための負荷装置(たとえば試験装置用磁石ダイナモ)として用いられる他、ハイブリッド車や電気自動車などに搭載されるモータとして用いてもよいし、その他の目的で用いてもよい。   Hereinafter, a brushless motor which is an example of a motor according to the present invention will be described with reference to the drawings. As shown in FIG. 1, this brushless motor has a rotor (movable element) 2 that rotates around the axis of the motor shaft 1 that is a rotating shaft, and a narrow gap (air gap G) that surrounds the outer periphery of the rotor 2. And a stator (stator) 3 fixed to a casing (not shown). This brushless motor is used as a load device (for example, a magnet dynamo for a test device) for applying an accurate load to the motor in order to perform a load test of a motor mounted on a hybrid vehicle or an electric vehicle. You may use as a motor mounted in a car, an electric vehicle, etc., and you may use for another purpose.

ロータ2は、モータ軸1の外周面の周方向略半分となる範囲(図では上側の半分)に、N極が外向きとなるよう配置された第1の磁石部21と、残る半分の範囲に、S極が外向きとなるよう配置された第2の磁石部22とを備える。第1の磁石部21は、N極が外向きとなるように周方向に沿って配置された複数(例えば10個)の永久磁石21Aを僅かな隙間を設けるあるいは隙間を無くして一体化して構成されており、第2の磁石部22は、S極が外向きとなるように周方向に沿って配置された複数(例えば10個)の永久磁石22Aを僅かな隙間を設けるあるいは隙間を無くして一体化して構成されている。   The rotor 2 has a first magnet portion 21 arranged so that the N pole faces outward in a range that is substantially half of the outer circumferential surface of the motor shaft 1 (upper half in the figure), and the remaining half range. And a second magnet portion 22 arranged so that the south pole faces outward. The first magnet portion 21 is formed by integrating a plurality of (for example, 10) permanent magnets 21A arranged along the circumferential direction so that the north pole faces outward, with a slight gap or without a gap. The second magnet portion 22 has a plurality of (for example, ten) permanent magnets 22A arranged along the circumferential direction so that the south pole faces outward, with a slight gap or no gap. It is constructed integrally.

ステータ3は、外側に位置する円環状のヨーク31と、このヨーク31の内周面からモータ軸1に向かって放射状に突出する複数(例えば24個)のティース32とを備えている。隣り合うティース32,32間の隙間は、スロット33と称し、ティース32の数と同数備えている。   The stator 3 includes an annular yoke 31 positioned on the outer side, and a plurality of (for example, 24) teeth 32 that project radially from the inner peripheral surface of the yoke 31 toward the motor shaft 1. The gap between the adjacent teeth 32 and 32 is referred to as a slot 33 and is provided in the same number as the number of teeth 32.

各ティース32には、巻線(図示せず)が巻回され、その巻線に電力を供給することによって、ステータ3に磁界が発生し、この磁界と第1,2の磁石部21,22からの磁力線との相互作用によってロータ2が回転するようになっている。   A winding (not shown) is wound around each tooth 32. By supplying power to the winding, a magnetic field is generated in the stator 3, and this magnetic field and the first and second magnet portions 21 and 22 are generated. The rotor 2 is rotated by the interaction with the magnetic field lines from.

ティース32は、ヨーク31から径方向内側へ延びるティース本体32Aと、このティース本体32Aの先端から更に径方向内側に延びて一体化された先端部32Bとを備えている。   The teeth 32 include a teeth body 32A that extends radially inward from the yoke 31 and a tip portion 32B that extends further radially inward from the tip of the teeth body 32A and is integrated.

ティース本体32Aは、板状に構成され、同一幅で径方向内側に延びる平面視において略長方形状に構成されている。また、先端部32Bには、図1及び図2に示すように、漏れ磁力線促進部132が形成され、隣り合う磁石部21,21(,22,22)同士の極性が切り替わる領域で、一方の磁石部21からティース32の先端部32Bに導かれた磁力線を漏れさせる機能を備えている。この漏れ磁力線促進部132は、磁石部21,22に対向する先端面132cと、この先端面132cの幅方向両端から径方向外側へ延びる一対の両側面132a,132bと、これら両側面132a,132bと前記ティース本体32Aの先端とを連結する楔部132d,132dとを備えている。   The teeth main body 32A is configured in a plate shape, and has a substantially rectangular shape in plan view extending inward in the radial direction with the same width. Moreover, as shown in FIG.1 and FIG.2, in the front-end | tip part 32B, the leakage magnetic force line | wire acceleration | stimulation part 132 is formed, and in the area | region where the polarity of adjacent magnet parts 21,21 (, 22,22) switches, A function of leaking the magnetic lines of force guided from the magnet unit 21 to the tip 32B of the tooth 32 is provided. The leakage magnetic force line promoting portion 132 includes a tip surface 132c facing the magnet portions 21 and 22, a pair of both side surfaces 132a and 132b extending radially outward from both widthwise ends of the tip surface 132c, and both side surfaces 132a and 132b. And wedge portions 132d and 132d that connect the tip of the teeth body 32A.

先端面132cは、ティース32の長手方向と略直交する方向に延びる平面でなり、また、両側面132a,132bは、径方向に延びると共に径方向外側ほど遠ざかり径方向内側ほど近くなるようなテーパー面に構成されている。尚、先端面132cの両側部は、ティース本体32Aの両側部よりも幅方向外側に少しだけ突出している。即ち、先端面132cの幅(周方向における寸法)は、ティース本体32Aの幅よりも広くなっている。また、楔部132d,132dは、ティース本体32A側ほど幅狭となる斜めにカットされた三角形状になっている。前記先端面132cと磁石部21,22の外周面21a,22aとの隙間が、エアギャップである。   The front end surface 132c is a flat surface extending in a direction substantially orthogonal to the longitudinal direction of the teeth 32, and both side surfaces 132a and 132b are tapered surfaces that extend in the radial direction and are further away from the radially outer side and closer to the radially inner side. It is configured. Note that both side portions of the distal end surface 132c slightly protrude outward in the width direction from both side portions of the teeth main body 32A. That is, the width (dimension in the circumferential direction) of the front end surface 132c is wider than the width of the teeth body 32A. Further, the wedge portions 132d and 132d have a triangular shape that is cut obliquely and becomes narrower toward the teeth main body 32A side. A gap between the tip surface 132c and the outer peripheral surfaces 21a and 22a of the magnet portions 21 and 22 is an air gap.

先端面132cの幅の大きさは、磁束量(誘起電圧値)によって決定される。従って、この磁束量や前記エアギャップの大きさ(長さ)を変更する(最適にする)ことによって、先端面132cの幅の大きさを決定することができる。次に、先端面132cの幅の大きさを具体的に設定する例を説明する。   The width of the front end surface 132c is determined by the amount of magnetic flux (induced voltage value). Therefore, by changing (optimizing) the amount of magnetic flux and the size (length) of the air gap, the width of the tip surface 132c can be determined. Next, an example in which the width of the distal end surface 132c is specifically set will be described.

両側面132a,132bは、漏れ磁力線促進部132に導かれる磁力線の本数(磁束量)に応じて大きさが設定されている。例えば、ティース32の先端部32Bの突出方向における長さ寸法(より詳しくは、両側面132a,132bの長さ寸法)をL1とし、ティース32の先端部32Bの幅寸法(より詳しくは、先端面132cの幅寸法)をL2とした場合に、0.5<L1/L2<1を満たすようにL1及びL2を設定することになる。つまり、ティース32の幅寸法L2に対してティース32の長さ寸法L1が0.5よりも大きくて1よりも小さくなるように、漏れ磁力線促進部132を設定することになる。   Both side surfaces 132a and 132b are set in size according to the number of magnetic lines of magnetic force (magnetic flux amount) guided to the leakage magnetic field line promoting part 132. For example, the length dimension (more specifically, the length dimension of both side surfaces 132a and 132b) of the distal end portion 32B of the tooth 32 is L1, and the width dimension (more specifically, the distal end surface) of the distal end portion 32B of the tooth 32. When the width dimension of 132c is L2, L1 and L2 are set so as to satisfy 0.5 <L1 / L2 <1. That is, the leakage magnetic force line promoting portion 132 is set such that the length dimension L1 of the teeth 32 is larger than 0.5 and smaller than 1 with respect to the width dimension L2 of the teeth 32.

このように設定しているのは、漏れ磁力線促進部132の先端面132cを通して導かれた磁石部21,22からの磁力線が、漏れ磁力線促進部132の幅方向の両側面132a,132bを通して逃がすことができるとした場合に、全磁力線を両側面から半分ずつ漏らすことができるから、ティース32の(先端部32Bの)幅寸法L2に対してティース32の(先端部32Bの)長さ寸法L1が半分となる0.5よりも大きく設定しておけば、磁力線を両側面132a,132bから確実に漏らすことができ、また、該永久磁石21A又は22Aからの磁力線を、漏れ磁力線促進部132の幅方向の両側面132a,132bのうちの一方の側面からしか逃がすことができないとした場合に、ティース32の(先端部32Bの)幅寸法L2に対してティース32の(先端部32Bの)長さ寸法L1を同一寸法に設定しておけば、一方の側面132a又は132bのみでも磁力線を確実に漏らすことができるからである。従って、磁石部21,22からティース32に導かれる磁力線の量を漏れ磁力線促進部132の両側面132a,132bから流すか、一方の面132b(又は132a)から流すように漏れ磁力線促進部132を設定することで、磁束密度を効果的に疎にすることができる。   The reason is that the magnetic lines of force from the magnet parts 21 and 22 guided through the front end surface 132c of the leakage magnetic force line promoting portion 132 escape through both side surfaces 132a and 132b in the width direction of the leakage magnetic force line promoting portion 132. When it is possible to do so, all the lines of magnetic force can be leaked by half from both side surfaces. If it is set to be larger than 0.5, which is half, the magnetic field lines can be surely leaked from both side surfaces 132a and 132b, and the magnetic field lines from the permanent magnet 21A or 22A The width dimension L of the tooth 32 (of the tip portion 32B) when it can be escaped only from one of the side surfaces 132a and 132b in the direction. By setting the (tip portion 32B) the length L1 of the teeth 32 in the same size with respect to, because it is possible to leak reliably magnetic field lines even only on one side 132a or 132b. Therefore, the leakage magnetic force line promoting portion 132 is made to flow from the both side surfaces 132a and 132b of the leakage magnetic force line promoting portion 132 or from one surface 132b (or 132a) so that the amount of the magnetic force lines guided from the magnet portions 21 and 22 to the teeth 32 is flowed. By setting, the magnetic flux density can be effectively sparse.

また、両側面132a,132bは、ティース32と磁石部21,22との間のエアギャップGの大きさに応じて大きさが設定されている。つまり、エアギャップGが小さくなればなるほど、エアギャップGにおける磁気抵抗が小さくなることから、磁石部21,22からの磁力線が漏れ磁力線促進部132へ伝わり易くなる。このため、漏れ磁力線促進部132の長さを長くする、つまり前記のようにティース32の(先端部32Bの)幅寸法L2に対してティース32の(先端部32Bの)長さ寸法L1を同一寸法になる側へ調整すれば、多量の磁力線を確実に漏れさせることができる。これに対して、エアギャップGが大きくなればなるほど、エアギャップGにおける磁気抵抗が大きくなることから、磁石部21,22からの磁力線が漏れ磁力線促進部132へ伝わり難くなる。このため、漏れ磁力線促進部132の長さを短くする、つまり前記のようにティース32の(先端部32Bの)幅寸法L2に対してティース32の(先端部32Bの)長さ寸法L1が半分となる0.5となる側へ調整すれば、ティース32の(先端部32Bの)長さを短くできながらも、少量の磁力線を確実に漏れさせることができる。   Moreover, the magnitude | size is set according to the magnitude | size of the air gap G between the teeth 32 and the magnet parts 21 and 22 on both the side surfaces 132a and 132b. That is, as the air gap G becomes smaller, the magnetic resistance in the air gap G becomes smaller, so that the magnetic lines of force from the magnet parts 21 and 22 are more easily transmitted to the leakage magnetic field line promoting part 132. For this reason, the length of the leakage magnetic force line promoting portion 132 is lengthened, that is, the length dimension L1 of the tooth 32 (of the tip end portion 32B) is the same as the width dimension L2 of the tooth 32 (the tip end portion 32B) as described above. By adjusting to the dimension side, a large amount of magnetic field lines can be surely leaked. On the other hand, the larger the air gap G, the greater the magnetic resistance in the air gap G, so that the magnetic lines of force from the magnet parts 21 and 22 are less likely to be transmitted to the leakage magnetic field line promoting part 132. Therefore, the length of the leakage magnetic force line promoting portion 132 is shortened, that is, as described above, the length dimension L1 of the tooth 32 (of the tip end portion 32B) is half of the width dimension L2 of the tooth 32 (of the tip end portion 32B). If the adjustment is made to the side of 0.5, the length of the tooth 32 (of the tip portion 32B) can be shortened, but a small amount of magnetic field lines can be surely leaked.

図2に、ロータ2の磁石部21,22のNS磁極が切り替わる領域(境界部分)122が前記隣り合うティース32,32のうちの一方のティース32に差し掛かった状態を示している。この状態では、一方のティース32に導かれる一方の磁石部21の永久磁石21Aから発した4本の磁力線4A,4B,4C,4Dのうちの3本の磁力線4A,4B,4Cが、漏れ磁力線促進部132の幅方向両側面132a,132bのうちの一方の面132bから漏れて他方の磁石部22の永久磁石22Aへ漏れている。尚、漏れなかった磁力線4Dは、ヨーク31を介して隣のティース32へ移動して他方の永久磁石22Aへ戻るようになっている。また、前記隣り合う2本のティース32,32の周方向両側に位置する各ティース32又は32において、永久磁石21Aからの磁力線4E,4Eが一方のティース32からヨーク31を介して他方のティース32へ移動して永久磁石22Aに戻るようになっている。   FIG. 2 shows a state in which a region (boundary portion) 122 where the NS magnetic poles of the magnet portions 21 and 22 of the rotor 2 are switched reaches one of the adjacent teeth 32. In this state, three magnetic lines 4A, 4B, 4C out of the four magnetic lines 4A, 4B, 4C, 4D emitted from the permanent magnet 21A of the one magnet portion 21 guided to one of the teeth 32 are leaked magnetic lines. It leaks from one side 132b of the width direction both sides 132a and 132b of the promotion part 132, and leaks to 22A of permanent magnets 22A of the other magnet part 22. FIG. The magnetic lines 4D that have not leaked move to the adjacent teeth 32 via the yoke 31 and return to the other permanent magnet 22A. Further, in each of the teeth 32 or 32 positioned on both sides in the circumferential direction of the two adjacent teeth 32, 32, the magnetic lines of force 4 E, 4 E from the permanent magnet 21 A are passed from one tooth 32 through the yoke 31 to the other tooth 32. To return to the permanent magnet 22A.

このように、漏れ磁力線促進部132が積極的に漏らす、つまり、漏れ磁力線促進部132は磁力線が先端面132cから側面132bの方へ流れる磁路を形成しており、先端面132cから導かれた磁力線を、前記磁路に沿って誘導して側面132bから漏らすので、漏れ磁力線促進部132が形成されている先端部32Bにおける磁力線の磁束密度を疎にすることができ、磁石部21,22とティース32との間に作用する吸引力(又は反発力)を小さくできる。結果、ロータ2(磁石21A,22A)に作用するコギングを抑えることができ、安定した出力トルクを得ることができるモータ1を実現することができる。   As described above, the leakage magnetic force line promoting portion 132 actively leaks, that is, the leakage magnetic force line promoting portion 132 forms a magnetic path in which the magnetic force lines flow from the front end surface 132c toward the side surface 132b, and is guided from the front end surface 132c. Since the magnetic field lines are guided along the magnetic path and leaked from the side surface 132b, the magnetic flux density of the magnetic field lines at the tip 32B where the leakage magnetic field line promoting part 132 is formed can be made sparse. The suction force (or repulsive force) acting between the teeth 32 can be reduced. As a result, it is possible to realize the motor 1 that can suppress cogging acting on the rotor 2 (magnets 21A, 22A) and can obtain a stable output torque.

前記漏れ磁力線促進部132の側面132a,132bの大きさは、導かれる磁力線の量とギャップGの大きさとに応じて設定されるので、無用に先端部32Bを大型化することなく、確実に漏れさせることができ、コギングを効果的に抑制できる利点がある。   Since the size of the side surfaces 132a and 132b of the leakage magnetic force line promoting portion 132 is set according to the amount of the magnetic force lines to be guided and the size of the gap G, it is possible to reliably leak without enlarging the tip portion 32B unnecessarily. There is an advantage that cogging can be effectively suppressed.

尚、本発明は、前記実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変更が可能である。   In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of this invention.

前記実施形態では、10個の永久磁石21A(N極が外向きとなる永久磁石)から第1の磁石部21を構成し、10個の永久磁石22A(S極が外向きとなる永久磁石)から第2の磁石部22を構成したが、図3に示すように、1個の永久磁石21B(N極が外向きとなる永久磁石)から第1の磁石部21を構成し、1個の永久磁石22B(S極が外向きとなる永久磁石)から第2の磁石部22を構成してもよい。この場合、これら永久磁石21B,22Bの周方向両端を、斜めに落としたテーパー面21T,22Tに形成するのが好ましい。このようなテーパー面21T,22Tとすることによって、領域122では、磁石部21,22の周方向端部側ほどエアギャップGが大きくなり、領域122における永久磁石21B,22Bとティース32との間の磁気抵抗が増大し、それによって吸引力(又は反発力)を抑制してコギングを抑制することができる。   In the above-described embodiment, the first magnet portion 21 is composed of 10 permanent magnets 21A (permanent magnets with the N pole facing outward), and 10 permanent magnets 22A (permanent magnets with the S pole facing outward). As shown in FIG. 3, the first magnet unit 21 is composed of one permanent magnet 21B (permanent magnet with the N pole facing outward), as shown in FIG. You may comprise the 2nd magnet part 22 from permanent magnet 22B (permanent magnet which S pole becomes outward). In this case, it is preferable to form both ends in the circumferential direction of the permanent magnets 21B and 22B on tapered surfaces 21T and 22T which are obliquely dropped. By adopting such tapered surfaces 21T and 22T, in the region 122, the air gap G becomes larger toward the end portions in the circumferential direction of the magnet portions 21 and 22, and between the permanent magnets 21B and 22B and the teeth 32 in the region 122. This increases the magnetic resistance, thereby suppressing the attractive force (or repulsive force) and suppressing cogging.

また、前記実施形態では、漏れ磁力線促進部132の両側面を平面にしたが、図4に示すように、漏れ磁力線促進部132の両側部に単数又は複数(図では4個)の突起132Fを備えさせる、あるいは、図5に示すように、前記両側部に単数又は複数の尖頭部を備えさせることによって、両側面を凹凸面とすることもできる。この場合、両側面132a,132bの面積を増大させることができるから、先端部の径方向寸法を小さくしてティース32を小型化することができるという利点がある。図4及び図5のいずれも、漏れ磁力線促進部132を、それの先端面132cからティース本体32Aに向かう程、幅広になっているが、同一幅であってもよい。   Moreover, in the said embodiment, although the both sides | surfaces of the leakage magnetic force line promotion part 132 were made into a plane, as shown in FIG. 4, the protrusion 132F of one or more (4 pieces in the figure) protrusion 132F was formed in the both sides of the leakage magnetic force line promotion part 132. Alternatively, as shown in FIG. 5, the side surfaces can be made uneven by providing one or more pointed heads on the both side portions. In this case, since the area of both side surfaces 132a and 132b can be increased, there is an advantage that the radial dimension of the tip portion can be reduced and the teeth 32 can be reduced in size. 4 and 5, the leakage magnetic force line promoting portion 132 becomes wider from the tip end surface 132c toward the teeth main body 32A, but it may be the same width.

また、前記実施形態では、漏れ磁力線促進部132の外周側(ヨーク31側)の両側部に斜めにカットした楔部132d,132dを備えさせたが、図6(a)に示すように、楔部132d,132dを省略することもできる。図6(a)では、漏れ磁力線促進部132を、それの先端面132cからティース本体32Aまで同一幅にしている。つまり、漏れ磁力線促進部132の両側面132a,132bがティース32の突出方向に沿った平面になっている。また、磁力線促進部132を、図6(b),(c)に示すように構成してもよい。図6(b)では、図4の漏れ磁力線促進部132をそれの先端面132cからティース本体32Aまで同一幅に構成し、その漏れ磁力線促進部132の両側部に単数(図では1個であるが、複数でもよい)の尖頭部132Tを備えさせた構成を示している。また、図6(c)では、漏れ磁力線促進部132をそれの先端面132cからティース本体32Aまで同一幅に構成し、磁力線促進部132の外周部側(ヨーク31側)端に先端側に凹む一対の凹部132K,132Kを備えさせた構成を示している。   In the above embodiment, the wedge portions 132d and 132d that are obliquely cut are provided on both sides on the outer peripheral side (yoke 31 side) of the leakage magnetic force line promoting portion 132. However, as shown in FIG. The parts 132d and 132d can be omitted. In FIG. 6A, the leakage magnetic force line promoting portion 132 has the same width from the tip end surface 132c thereof to the teeth main body 32A. That is, both side surfaces 132 a and 132 b of the leakage magnetic force line promoting portion 132 are flat along the protruding direction of the teeth 32. Moreover, you may comprise the magnetic force line promotion part 132 as shown in FIG.6 (b), (c). In FIG. 6B, the leakage magnetic force line promoting portion 132 of FIG. 4 is configured to have the same width from the tip end surface 132c to the teeth main body 32A, and a single (in the figure, one is present) on both sides of the leakage magnetic force line promoting portion 132. However, a plurality of point heads 132T may be provided. Further, in FIG. 6C, the leakage magnetic force line promoting portion 132 is configured to have the same width from the front end surface 132c to the teeth body 32A, and is recessed toward the front end side at the outer peripheral side (yoke 31 side) end of the magnetic force line promoting portion 132. The structure provided with a pair of recessed parts 132K and 132K is shown.

また、前記実施形態では、インナー型のブラシレスモータを示したが、アウター型のブラシレスモータでもよいし、種々のリニアモータであってもよい。   Moreover, although the inner type brushless motor was shown in the said embodiment, an outer type brushless motor may be sufficient and various linear motors may be sufficient.

また、前記実施形態では、ポール数が2極でスロット数が24個のモータを示したが、これに限定されることなく、極数及びスロット数を自由に設定した種々のモータであってもよい。   In the above embodiment, a motor having two poles and 24 slots is shown. However, the present invention is not limited to this, and various motors having freely set poles and slots may be used. Good.

また、前記実施形態では、角型の永久磁石を用いたが、周方向両端の角が取れたカマボコ形状の永久磁石を用いてもよい。   Moreover, in the said embodiment, although the square-shaped permanent magnet was used, you may use the hook-shaped permanent magnet from which the corner | angular of the both ends of the circumferential direction was taken.

また、前記実施形態では、全てのティース32に漏れ磁力線促進部132を備えさせたが、一部のティース32に漏れ磁力線促進部132を備えさせて実施することもできる。   Moreover, in the said embodiment, although all the teeth 32 were equipped with the leakage magnetic force line promotion part 132, it can also be made to equip some teeth 32 with the leakage magnetic force line promotion part 132, and can implement.

1…モータ軸、2…ロータ、3…ステータ、4A,4B,4C…磁力線、21,22…磁石部、21A,21B,22A,22B…永久磁石、21T…テーパー面、21a,22a…外周面、31…ヨーク、32…ティース、33…スロット、122…領域、132…漏れ磁力線促進部、132K,132K…凹部、132T,132T…突起、132a,132b…幅方向両側面、132a,132b…両側面、G…エアギャップ   DESCRIPTION OF SYMBOLS 1 ... Motor shaft, 2 ... Rotor, 3 ... Stator, 4A, 4B, 4C ... Magnetic field line, 21, 22 ... Magnet part, 21A, 21B, 22A, 22B ... Permanent magnet, 21T ... Tapered surface, 21a, 22a ... Outer peripheral surface , 31 ... Yoke, 32 ... Teeth, 33 ... Slot, 122 ... Region, 132 ... Leakage magnetic force line promotion part, 132K, 132K ... Recess, 132T, 132T ... Projection, 132a, 132b ... Both sides in the width direction, 132a, 132b ... Both sides Surface, G ... Air gap

Claims (3)

極性を交互に配置させた複数の磁石部と、該複数の磁石部に対向するよう突出し、前記磁石部と相対移動可能に構成された複数のティースとを備え、
前記ティースの先端部には、隣り合う磁石部同士の極性が切り替わる領域で、磁石部から導かれた磁力線を漏れさせる漏れ磁力線促進部が形成されていることを特徴とするモータ。
A plurality of magnet portions alternately arranged in polarity, and a plurality of teeth protruding so as to face the plurality of magnet portions and configured to be relatively movable with the magnet portion,
The motor is characterized in that a leakage magnetic force line accelerating portion for leaking magnetic force lines introduced from the magnet portion is formed at a tip portion of the tooth in a region where the polarities of adjacent magnet portions are switched.
前記漏れ磁力線促進部は、前記ティースの突出方向と直交する幅方向の両側面を備え、該両側面は、前記導かれる磁力線の量に応じて大きさが設定されていることを特徴とする請求項1に記載のモータ。   The leakage magnetic force line promoting portion includes both side surfaces in a width direction perpendicular to the protruding direction of the teeth, and the both side surfaces are sized according to the amount of the magnetic force lines to be guided. Item 4. The motor according to Item 1. 前記漏れ磁力線促進部は、前記ティースの突出方向と直交する幅方向の両側面を備え、該両側面は、前記ティースと前記磁石部との間のエアギャップの大きさに応じて大きさが設定されていることを特徴とする請求項1に記載のモータ。   The leakage magnetic force line promoting portion includes both side surfaces in the width direction orthogonal to the protruding direction of the teeth, and the both side surfaces are set according to the size of the air gap between the teeth and the magnet portion. The motor according to claim 1, wherein the motor is provided.
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