JP5080053B2 - Axial gap motor - Google Patents

Axial gap motor Download PDF

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JP5080053B2
JP5080053B2 JP2006274380A JP2006274380A JP5080053B2 JP 5080053 B2 JP5080053 B2 JP 5080053B2 JP 2006274380 A JP2006274380 A JP 2006274380A JP 2006274380 A JP2006274380 A JP 2006274380A JP 5080053 B2 JP5080053 B2 JP 5080053B2
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case
rotor
center line
stator
axial gap
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JP2008099344A (en
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善也 中村
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KYB Corp
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Description

本発明は、軸方向空隙型電動機、特に回転軸の偏芯許容構造を備えた軸方向空隙型電動機に関するものである。   The present invention relates to an axial gap type electric motor, and more particularly to an axial gap type electric motor provided with an eccentricity allowing structure for a rotating shaft.

従来、低速高トルクが要求される電動機に対応する電動機として、回転軸方向に固定子と回転子とが対向して配置される軸方向空隙型電動機がある。従来の軸方向空隙型電動機は、コイルが巻回される固定子と、このコイルに回転軸方向に対向して配置され、複数対の永久磁石が周方向起磁力形に配置される回転子とからなり、固定子コイルに電流を流して回転磁界を発生させ、これに伴い固定子と回転子との間の磁気的な吸引力および反発力によって、回転子を回転させるものである(特許文献1、2参照のこと)。
特開2002−153028号公報 特開平11‐187635号公報
2. Description of the Related Art Conventionally, as an electric motor corresponding to an electric motor that requires low speed and high torque, there is an axial gap type electric motor in which a stator and a rotor are arranged to face each other in the direction of a rotation axis. A conventional axial gap type electric motor includes a stator around which a coil is wound, a rotor that is arranged to face the coil in the direction of the rotation axis, and a plurality of pairs of permanent magnets are arranged in a circumferential magnetomotive force type. And a rotating magnetic field is generated by passing a current through the stator coil, and the rotor is rotated by a magnetic attraction force and a repulsive force between the stator and the rotor (Patent Literature). 1 and 2).
JP 2002-153028 A Japanese Patent Laid-Open No. 11-187635

しかしながら、これら従来の軸方向空隙型電動機では、固定子の中心線と回転子の回転軸中心線とを同一中心線として構成され、たとえば回転子に接続する被回転部材の回転中心線も回転子の回転中心線と同一にする必要が生じるが、組み立て精度等を考慮するとバラツキを除去することができず、この中心線のズレ(偏芯量)を許容するために、例えばオルダムカップリングを回転子と被回転部材間に設置することが行われている。   However, in these conventional axial gap type electric motors, the center line of the stator and the rotation axis center line of the rotor are configured as the same center line. For example, the rotation center line of the rotated member connected to the rotor is also the rotor. It is necessary to make it the same as the rotation center line, but considering the assembly accuracy, etc., the variation cannot be removed, and in order to allow deviation (eccentricity) of this center line, for example, the Oldham coupling is rotated. Installation between the child and the rotated member is performed.

このため、オルダムカップリングの設定に伴い、コストアップや重量増加という課題が生じる。   For this reason, the subject of a cost increase and a weight increase arises with the setting of Oldham coupling.

本発明は上記の問題点を鑑みてなされたものであり、偏芯許容構造を備えた軸方向空隙型電動機を提供することを目的とする。   The present invention has been made in view of the above-described problems, and an object thereof is to provide an axial gap type electric motor having an eccentricity allowing structure.

本発明は、永久磁石またはコイルの一方を周方向に所定間隔で複数個設置した回転子と、前記回転子の回転軸の中心線方向に前記永久磁石またはコイルの一方に対向するように前記永久磁石またはコイルの他方を備えた固定子とを備え、前記固定子が前記回転子の回転軸の中心線方向に所定空隙を持って前記回転子に相対するように配置された電動機部を有する軸方向空隙型電動機において、前記回転子と前記固定子とを内装し、その内面に前記固定子を固定するケースと、前記ケースと前記回転軸との間に設けられ、前記ケースの中心線に対する直交方向での前記回転子の前記ケースに対する変位を許容するとともに、前記回転子の回転軸の中心線回りの回転を可能とする弾性部材と、を備え、前記ケースは、前記固定子を固定する第1ケースと、前記弾性部材が固定され、前記ケースの中心線方向にスラストベアリングを介して前記第1ケースに押し付けられる第2ケースと、からなることを特徴とする軸方向空隙型電動機である。 The present invention provides a rotor in which one of permanent magnets or coils is installed at a predetermined interval in the circumferential direction, and the permanent magnet or coil is opposed to one of the permanent magnets or coils in the center line direction of the rotation axis of the rotor. And a stator having the other of a magnet or a coil, and a shaft having an electric motor portion disposed so as to face the rotor with a predetermined gap in the center line direction of the rotation shaft of the rotor. In the direction gap type electric motor, the rotor and the stator are internally provided, a case for fixing the stator to the inner surface thereof, and provided between the case and the rotating shaft, and orthogonal to the center line of the case while allowing displacement with respect to the case of the rotor in the direction, and an elastic member to allow rotation around the longitudinal centerline axis of rotation of said rotor, said casing includes a first fixing the stator 1 piece Graphics and the elastic member is fixed, and a second case, which is pressed against the first case via a thrust bearing in the center line direction of the case, it is an axial air gap type electric motor, characterized in comprising a.

本発明では、回転子の回転中心線とケースの中心線、つまり固定子の中心線とのズレを許容する弾性部材を備えたので、ズレを許容するために回転子と被回転部材間に設けていたオルダムカップリングを廃止することができ、コストの低減や軽量化を図ることができる。   In the present invention, the elastic member that allows the deviation between the rotation center line of the rotor and the center line of the case, that is, the center line of the stator is provided, so that it is provided between the rotor and the rotated member to allow the deviation. The old Oldham coupling can be abolished, and the cost can be reduced and the weight can be reduced.

以下、本発明の実施の形態を添付図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

図1は、本発明の軸方向空隙型電動機1の構成を示す回転子3の回転中心線を含む断面図である。   FIG. 1 is a cross-sectional view including a rotation center line of a rotor 3 showing a configuration of an axial gap type electric motor 1 of the present invention.

本実施形態において、被回転部材に接続するロータ軸2と、ロータ軸2に固定された回転子3と、ロータ軸2の中心線方向に所定の空隙14をもって回転子3に対向するように設けられた一対の固定子4とからなる電動機部1aを、第1ケース5a内に収納し、この第1ケース5aを中心線方向から挟持する第2ケース5bとから軸方向空隙型電動機1を構成する。なお、本実施形態ではロータ軸2方向に1列の電動機部1aを備えた軸方向空隙型電動機1を用いて説明するが、これに限らず、複数個の電動機部1aからなる軸方向空隙型電動機1であってもよい。   In the present embodiment, the rotor shaft 2 connected to the member to be rotated, the rotor 3 fixed to the rotor shaft 2, and the rotor shaft 2 is provided so as to face the rotor 3 with a predetermined gap 14 in the center line direction. The motor unit 1a including the pair of stators 4 is housed in the first case 5a, and the axial gap type motor 1 is configured from the second case 5b that sandwiches the first case 5a from the center line direction. To do. In the present embodiment, the description will be given by using the axial gap type electric motor 1 provided with one row of electric motor parts 1a in the rotor shaft 2 direction. However, the present invention is not limited to this, and the axial gap type is composed of a plurality of electric motor parts 1a. The electric motor 1 may be used.

回転子3は図示しない被回転部材に接続するロータ軸2の中心線に直交する方向に延出する4本の腕部6を備え、これら腕部6は周方向に等間隔(例えば90°間隔)で配置される。   The rotor 3 includes four arm portions 6 extending in a direction perpendicular to the center line of the rotor shaft 2 connected to a rotation member (not shown). ).

図1に示すように、回転子3の各腕部6には、腕部6を挟み込むように永久磁石12が取り付けられる。永久磁石12は、例えば軸方向から見て略扇状に形成され、各腕部6に固定される。また永久磁石12の端面は、回転子3の中心線に直交する面として形成される。なお、永久磁石12の数、形状等は本実施形態に限定されるものでないことは言うまでもない。   As shown in FIG. 1, a permanent magnet 12 is attached to each arm portion 6 of the rotor 3 so as to sandwich the arm portion 6. For example, the permanent magnet 12 is formed in a substantially fan shape when viewed from the axial direction, and is fixed to each arm portion 6. The end surface of the permanent magnet 12 is formed as a surface orthogonal to the center line of the rotor 3. Needless to say, the number, shape, and the like of the permanent magnets 12 are not limited to those of the present embodiment.

一対の固定子4は、ロータ軸2の中心線方向にて回転子3の永久磁石12にそれぞれ対向する位置に設けられる。固定子4は、ヨーク部8と、ヨーク部8から回転子側に突出し、略扇状の形状を有するティース部9と、ティース部9に巻回されるコイル10とから構成される。ヨーク部8は、ティース部9をケース5に固定するとともに、ティース部9の磁束を周方向に回して別のティース部9へ流す役割を果す。またコイル10は図示しない絶縁体等を介して、ティース部9から絶縁される。   The pair of stators 4 are provided at positions facing the permanent magnets 12 of the rotor 3 in the center line direction of the rotor shaft 2. The stator 4 includes a yoke portion 8, a teeth portion 9 that protrudes from the yoke portion 8 toward the rotor and has a substantially fan shape, and a coil 10 that is wound around the teeth portion 9. The yoke part 8 plays a role of fixing the tooth part 9 to the case 5 and rotating the magnetic flux of the tooth part 9 in the circumferential direction to flow to another tooth part 9. Further, the coil 10 is insulated from the tooth portion 9 via an insulator or the like (not shown).

ケース5は固定子4が固定される第1ケース5aと、スラストベアリング7を介して第1ケースを挟持する第2ケース5bからなる。第1ケース5aは、固定子4と同軸上に配置された中空円柱形状の部材であって、その中心線上に沿ってロータ軸2が貫通するべく孔部5eが形成される。ティース部8は、第1ケース5aの中心線に直交する内周面5cにそれぞれ固定される。一方、第1ケース5aの中心線に直交する第1ケース5aのそれぞれの外周面5dにはスラストベアリング7が配置され、スラストベアリング7を介して一対の第2ケース5bが中心線方向に第1ケース5aを挟持する。第1、第2ケース5a、5b間にスラストベアリング7を設けることで、回転子3と固定子4との間の中心線方向の空隙14の寸法を精度よく管理することができる。また、このスラストベアリング7は、第1、第2ケース5a、5b間に設けたので、回転子3の慣性質量に影響することがない。なお、第1、第2ケース5a、5bは一体的に構成してもよい。   The case 5 includes a first case 5 a to which the stator 4 is fixed, and a second case 5 b that sandwiches the first case via a thrust bearing 7. The first case 5a is a hollow cylindrical member arranged coaxially with the stator 4, and a hole 5e is formed so that the rotor shaft 2 penetrates along the center line. Teeth portion 8 is fixed to inner peripheral surface 5c orthogonal to the center line of first case 5a. On the other hand, a thrust bearing 7 is arranged on each outer peripheral surface 5d of the first case 5a orthogonal to the center line of the first case 5a, and the pair of second cases 5b are first in the center line direction via the thrust bearing 7. The case 5a is clamped. By providing the thrust bearing 7 between the first and second cases 5a and 5b, the dimension of the gap 14 in the center line direction between the rotor 3 and the stator 4 can be accurately managed. Further, since the thrust bearing 7 is provided between the first and second cases 5a and 5b, the inertial mass of the rotor 3 is not affected. The first and second cases 5a and 5b may be integrally formed.

第2ケース5bは、前述のスラストベアリング7が設置される本体部5fと、第2ケース5bの中心線に沿って配置される円筒状のフランジ部5gとからなり、固定子4の中心線と第2ケース5bの中心線を同軸に配置する。フランジ部5gの中心線上にロータ軸2の中心線が一致するようにフランジ部5gとロータ軸2とが配置され、フランジ部5gの内周面5hとロータ軸2と外周との間に弾性部材13が配置される。   The second case 5b includes a main body portion 5f on which the above-described thrust bearing 7 is installed, and a cylindrical flange portion 5g disposed along the center line of the second case 5b. The center line of the second case 5b is arranged coaxially. The flange portion 5g and the rotor shaft 2 are arranged so that the center line of the rotor shaft 2 coincides with the center line of the flange portion 5g, and an elastic member is provided between the inner peripheral surface 5h of the flange portion 5g, the rotor shaft 2 and the outer periphery. 13 is arranged.

弾性部材13は、ベアリング13aとゴムブッシュ13bとにより一体的に構成される。ベアリング13aはローラ軸2の外周に嵌合し、ベアリング13aの外周側に配置されたゴムブッシュ13bは第2ケース5bの内周面5hに嵌合される。ベアリング13aはロータ軸2と第2ケース5b間の相対回転、つまり固定子4に対する回転子3の相対回転を許容する。また、ゴムブッシュ13bは第2ケース5bに対するロータ軸2の第2ケース5bの中心線に対する直交方向の変位を許容し、結果として固定子4に対する回転子3の相対変位を可能とする。   The elastic member 13 is integrally configured by a bearing 13a and a rubber bush 13b. The bearing 13a is fitted to the outer circumference of the roller shaft 2, and the rubber bush 13b disposed on the outer circumference side of the bearing 13a is fitted to the inner circumferential surface 5h of the second case 5b. The bearing 13 a allows relative rotation between the rotor shaft 2 and the second case 5 b, that is, relative rotation of the rotor 3 with respect to the stator 4. Further, the rubber bush 13b allows displacement of the rotor shaft 2 in a direction perpendicular to the center line of the second case 5b with respect to the second case 5b, and as a result, enables relative displacement of the rotor 3 with respect to the stator 4.

なお、第1、第2ケース5a、5bとは、それぞれ図示しない構造物等に固定される。また、第1、第2ケース5a、5b間に設けられたスラストベアリング7とともに図示しないリニアガイドを設けることで、第1ケース5aを構造物に固定する必要がなくなる。さらにまた、第2ケース5bは、一対で構成される必要はなく、一方から第1ケース5aを押し付けるようにしてもよい。   The first and second cases 5a and 5b are fixed to structures or the like (not shown). Further, by providing a linear guide (not shown) together with the thrust bearing 7 provided between the first and second cases 5a and 5b, it is not necessary to fix the first case 5a to the structure. Furthermore, the second case 5b does not need to be configured as a pair, and the first case 5a may be pressed from one side.

そして、第1ケース5aの相対する内周面5cにそれぞれ固定子4が固定され、各固定子4間の空間に回転子3の永久磁石12が配置され、電動機部1aが構成される。なお、各電動機部1aが構成された状態で、回転子3と、回転子3に相対する一対の固定子4との軸方向のそれぞれの空隙14が所定値となるように設置される。   And the stator 4 is each fixed to the internal peripheral surface 5c which the 1st case 5a opposes, The permanent magnet 12 of the rotor 3 is arrange | positioned in the space between each stator 4, and the motor part 1a is comprised. In addition, in the state where each electric motor unit 1a is configured, the respective gaps 14 in the axial direction between the rotor 3 and the pair of stators 4 opposed to the rotor 3 are set so as to have a predetermined value.

ここで、ケース5の孔部5eは、ロータ軸2の直径に対して所定量だけ大きく形成され、前述のように回転子3はロータ軸2の直交方向に変位可能に構成されるが、この孔部5eの径とロータ軸2の直径との差、または弾性部材13を構成するゴムブッシュ13bのロータ軸2の中心線に対して直交方向のたわみ量によって回転子3の中心線に対して直交する方向の相対的な変位量が規定される。   Here, the hole 5e of the case 5 is formed larger than the diameter of the rotor shaft 2 by a predetermined amount, and the rotor 3 is configured to be displaceable in the direction perpendicular to the rotor shaft 2 as described above. The difference between the diameter of the hole 5e and the diameter of the rotor shaft 2 or the amount of deflection in the direction perpendicular to the center line of the rotor shaft 2 of the rubber bush 13b constituting the elastic member 13 with respect to the center line of the rotor 3 A relative displacement amount in the orthogonal direction is defined.

なお、本実施形態では、回転子3に永久磁石を、固定子4にコイルを設置したが、逆に回転子3にコイルを、固定子に永久磁石を設けるようにしてもよい。   In this embodiment, the rotor 3 is provided with a permanent magnet and the stator 4 is provided with a coil, but conversely, the rotor 3 may be provided with a coil and the stator may be provided with a permanent magnet.

次に作用を説明する。   Next, the operation will be described.

本発明の軸方向空隙型電動機1は、例えば、第1、第2ケース5a、5bを図示しない構造物に固定し、回転子3に固定されるロータ軸2を被回転部材に接続した状態で固定子4のコイル10に通電する。固定子4のコイル10に通電されると、回転磁界が発生し、これに伴い固定子4と回転子3との間の磁気的な吸引力および反発力によって、回転子3を所定方向に回転させる。この回転により回転子3に接続する図示しない被回転部材が回転する。   The axial gap type electric motor 1 of the present invention is, for example, in a state in which the first and second cases 5a and 5b are fixed to a structure (not shown) and the rotor shaft 2 fixed to the rotor 3 is connected to the rotated member. The coil 10 of the stator 4 is energized. When the coil 10 of the stator 4 is energized, a rotating magnetic field is generated, and accordingly, the rotor 3 is rotated in a predetermined direction by the magnetic attractive force and repulsive force between the stator 4 and the rotor 3. Let By this rotation, a rotated member (not shown) connected to the rotor 3 rotates.

ロータ軸2は被回転部材に接続されるため、被回転部材に作用する外力がロータ軸2にも作用することになる。本発明では、回転子3が固定子4に対してロータ軸2の中心線に対して直交方向に変位を可能とする弾性部材13をケース5に備えているため、被回転部材の変位に伴いロータ軸2が変位する場合に、弾性部材13のゴムブッシュ13bの作用により回転子3の固定子4の中心線に直交する方向の変位が許容され、回転子3は固定子4の中心線に対して偏芯した位置を中心線として回転することができる。   Since the rotor shaft 2 is connected to the rotated member, the external force acting on the rotated member also acts on the rotor shaft 2. In the present invention, the case 3 is provided with the elastic member 13 that enables the rotor 3 to be displaced in a direction orthogonal to the center line of the rotor shaft 2 with respect to the stator 4. When the rotor shaft 2 is displaced, displacement of the rotor 3 in the direction perpendicular to the center line of the stator 4 of the rotor 3 is allowed by the action of the rubber bush 13b of the elastic member 13, and the rotor 3 is aligned with the center line of the stator 4. The position eccentric to the center can be rotated as a center line.

また、ロータ軸2と被回転部材とを接続する場合において、その中心線を一致させる精度の許容範囲を大きく設定することができる。このため、ロータ軸2と被回転部材との間に偏芯を許容する手段、例えばオルダムカップリングを設ける必要がなく、コストの削減、軽量化を図ることができる。   Further, when connecting the rotor shaft 2 and the rotated member, an allowable range of accuracy for matching the center line can be set large. For this reason, it is not necessary to provide a means for allowing eccentricity between the rotor shaft 2 and the rotated member, for example, an Oldham coupling, and cost reduction and weight reduction can be achieved.

本発明は上記の実施の形態に限定されずに、その技術的な思想の範囲内において種々の変更がなしうることは明白である。   The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

本発明の軸方向空隙型電動機1の構成を説明する断面図である。It is sectional drawing explaining the structure of the axial direction air gap type | mold electric motor 1 of this invention.

符号の説明Explanation of symbols

1 軸方向空隙型電動機
1a 電動機部
2 ロータ軸
3 回転子
4 固定子
5 ケース
5a 第1ケース
5b 第2ケース
6 腕部
7 スラストベアリング
8 ヨーク
9 ティース部
10 コイル
12 永久磁石
13 弾性部材
13a ベアリング
13b ゴムブッシュ
14 空隙
DESCRIPTION OF SYMBOLS 1 Axial direction gap | interval motor 1a Electric motor part 2 Rotor shaft 3 Rotor 4 Stator 5 Case 5a 1st case 5b 2nd case 6 Arm part 7 Thrust bearing 8 Yoke 9 Teeth part 10 Coil 12 Permanent magnet 13 Elastic member 13a Bearing 13b Rubber bush 14 gap

Claims (3)

永久磁石またはコイルの一方を周方向に所定間隔で複数個設置した回転子と、
前記回転子の回転軸の中心線方向に前記永久磁石またはコイルの一方に対向するように前記永久磁石またはコイルの他方を備えた固定子とを備え、
前記固定子が前記回転子の回転軸の中心線方向に所定空隙を持って前記回転子に相対するように配置された電動機部を有する軸方向空隙型電動機において、
前記回転子と前記固定子とを内装し、その内面に前記固定子を固定するケースと、
前記ケースと前記回転軸との間に設けられ、前記ケースの中心線に対する直交方向での前記回転子の前記ケースに対する変位を許容するとともに、前記回転子の回転軸の中心線回りの回転を可能とする弾性部材と、を備え
前記ケースは、前記固定子を固定する第1ケースと、前記弾性部材が固定され、前記ケースの中心線方向にスラストベアリングを介して前記第1ケースに押し付けられる第2ケースと、からなることを特徴とする軸方向空隙型電動機。
A rotor in which one of permanent magnets or coils is installed at a predetermined interval in the circumferential direction;
A stator provided with the other of the permanent magnet or the coil so as to face one of the permanent magnet or the coil in the direction of the center line of the rotation axis of the rotor,
In the axial gap type electric motor having an electric motor portion arranged so that the stator has a predetermined gap in the direction of the center line of the rotation axis of the rotor and faces the rotor,
A case in which the rotor and the stator are internally provided, and the stator is fixed to an inner surface thereof;
Provided between the case and the rotating shaft, allowing displacement of the rotor relative to the case in a direction orthogonal to the center line of the case, and allowing rotation around the center line of the rotating shaft of the rotor and an elastic member to,
The case includes: a first case for fixing the stator; and a second case to which the elastic member is fixed and pressed against the first case via a thrust bearing in a center line direction of the case. A featured axial gap motor.
前記弾性部材は、前記回転軸を支持する第1ベアリングと、前記ベアリングと前記ケース間に設けられるゴム部材とから構成され、前記第1ベアリングと前記ゴム部材とを前記ケースの中心線に対して直交する方向に並設することを特徴とする請求項1に記載の軸方向空隙型電動機。   The elastic member includes a first bearing that supports the rotating shaft, and a rubber member provided between the bearing and the case, and the first bearing and the rubber member are arranged with respect to a center line of the case. The axial gap type electric motor according to claim 1, wherein the electric motors are arranged in parallel in an orthogonal direction. 前記第1、第2ケース間に第1、第2ケース間の相対回転を抑制するリニアガイドを設けることを特徴とする請求項1又は2に記載の軸方向空隙型電動機。The axial gap motor according to claim 1, wherein a linear guide that suppresses relative rotation between the first and second cases is provided between the first and second cases.
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