JP3918428B2

JP3918428B2 - Commutator motor rotor

Info

Publication number: JP3918428B2
Application number: JP2000381829A
Authority: JP
Inventors: 伴義横田
Original assignee: Hitachi Koki Co Ltd
Current assignee: Koki Holdings Co Ltd
Priority date: 2000-12-15
Filing date: 2000-12-15
Publication date: 2007-05-23
Anticipated expiration: 2020-12-15
Also published as: JP2002186216A

Description

【０００１】
【発明の属する技術分野】
本発明は整流子モータの回転子に関するものである。
【０００２】
【従来の技術】
従来の整流子モータの回転子１は、図４に示す如く、ラジアル方向外側に開き軸方向に沿って延びるスロットを少なくとも３つ以上有し、回転軸４に装着されるコア２、コア２のスロットとほぼ同一形状のスロットを有し、コア２の軸方向両端面に装着される絶縁材からなるエンドプレート３、コア２のスロット内に２スロット以上の間隔をもって軸方向に沿って巻回されるコイル７、回転軸４に装着される冷却ファン５等により構成され、巻回されたコイル７はワニス等を含浸することにより固定される。各コイル７は総て整流子６に接続されており、モータの運転に際し整流子６よりコイル７に電流が流れ、コイル７は抵抗損失による発熱が生じる。このコイル７の発熱を効率よく放出させるため、回転軸４上に冷却ファン５が装着されており、冷却ファン５は回転子１と同期して回転する。冷却ファン５により生じた気流は図５に示す如く、ハウジングに設けられた吸気口１２を介してモータに流れ、冷却風の一部はコイル７のコア２より露出したコイルエンド部７ａ、７ｂに当たりコイル７の発熱を奪い排気口１３より外部に放出される。
【０００３】
【発明が解決しようとする課題】
コイル７の巻線は巻線機により自動化されており、巻線時にワイヤがスロットからはみ出すのを防止するためにワイヤは適度なテンションをもって各スロットへ一様に巻回され、スロットに巻回されたコイル束の断面積が最小になるようにコントロールされ巻線されている。その際、コイル７の発熱を放出する重要な働きを持つコイルエンド部７ａ、７ｂは前記コイル束を重ね合わせて形成されているため、同様にコイルエンド部７ａ、７ｂの表面積は最小限に成形され放熱性能向上のためにコイル７の表面積を広げることは製造上困難である。
【０００４】
本発明の目的は、上記した従来技術の欠点をなくし、従来の製造工程を変更せずまた部品数を増ことなくコイルエンド部の放熱面積を増加させ、コイルの放熱性能を向上させることである。
【０００５】
【課題を解決するための手段】
上記目的は、コアの端面に位置する絶縁材からなるエンドプレートの突起部に軸方向の溝を設け、溝部の両壁にスロットに巻回されたコイルの放熱面を形成することにより達成される。
【０００６】
【発明の実施の形態】
本発明の一実施形態を示す回転子を図１を参照して説明する。本発明は以下に述べるコア端面のエンドプレート以外は上記した回転子とほぼ同じであり説明を省略する。
【０００７】
前記コア２の両端面に位置する絶縁材からなるエンドプレート３の突起部３ａに軸方向の溝部８を設けたのが本発明の特徴である。回転子１のワイヤは巻線時任意のスロットに回転軸４と平行に挿入された後溝部８を越えて他のスロットに同様に挿入され巻回することにより、溝部８は各スロットに巻回されたコイル７により挟まれた空間として形成される。
【０００８】
上記のように構成した結果、空間の軸方向の両壁を形成するコイル７の表面が放熱面９となるためコイルエンド部７ａ、７ｂの放熱表面積が増加しコイル７の放熱性能を向上させることができる。上記実施形態を示す図1にはエンドプレート３の溝部８をコア２の両方に設けているが、一側のエンドプレート３のみに設けてもよい。
【０００９】
本発明の他の実施形態に係る回転子１を図２に示す。前記溝部８およびスロット部の底部を形成しているエンドプレート３の円周部にコイルエンド７ａ、７ｂ側の回転軸４に通ずる孔１０を設けたものである。この結果コイル７の固定に使用されるワニスが必要以上に塗布された場合でもワニスは前記孔１０を介して回転軸４に流れ落ちるため、前記溝部８がワニスにより埋没することがなくなりコイル７の放熱面９が常に形成される。
【００１０】
本発明の更に他の実施形態に係る回転子１を図３に示す。回転子１はエンドプレート３のスロット底部の軸方向面をコア２側よりコイルエンド部７ａ、７ｂに下る傾斜部１１を設けたものである。この結果ワイヤは傾斜部１１に沿って巻回されるため、半径方向に沿った長さ分１コイルの全長が短くなって抵抗値が減少し、コイル７の発熱量が低減される。また、傾斜部１１によりコイル７も傾斜するためエンドプレート３の突起部３ｂの露出部分が広がり回転子１の回転時、突起部３ｂが冷却ファンとして働き更なるコイル７の放熱性能向上を図ることができる。
【００１１】
【発明の効果】
以上のように本発明によれば、コア端面のエンドプレートの突起部に軸方向の溝を設けたので、溝部には両壁がコイルにより形成された空間となり、両壁を形成するコイルの表面が放熱面となりコイルエンド部のコイルの放熱表面積が増加しコイルの放熱性能を向上させることができる。また従来のエンドプレートに軸方向の溝を設けるという極めて簡単な構造で、製造工程の変更もなく部品数を増やさず低コストで有効な回転子を提供できるようになる。
【図面の簡単な説明】
【図１】本発明回転子の一実施形態を示す一部断面側面図。
【図２】本発明回転子の他の実施形態を示す一部断面側面図。
【図３】本発明回転子の更に他の実施形態を示す一部断面側面図。
【図４】従来の回転子の一例を示す一部断面側面図。
【図５】モータ内の気流の流れを示す説明用側面図。
【符号の説明】
１は回転子、２はコア、３はエンドプレート、３ａ、３ｂはエンドプレート３の突起部、４は回転軸、５は冷却ファン、６は整流子、７ａ、７bはコイルエンド、８はエンドプレート３の軸方向溝部、９はコイル放熱表面部、１０は孔、１１はエンドプレート３のスロット底部の傾斜部、１２は吸気口、１３は排気口。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor of a commutator motor.
[0002]
[Prior art]
As shown in FIG. 4, the rotor 1 of the conventional commutator motor has at least three or more slots that extend outward in the radial direction and extend along the axial direction, and the core 2 and the core 2 mounted on the rotary shaft 4. An end plate 3 made of an insulating material having a slot having substantially the same shape as the slot and mounted on both axial end faces of the core 2 is wound along the axial direction within the slot of the core 2 with an interval of 2 slots or more. The coil 7 and the cooling fan 5 attached to the rotating shaft 4 are fixed, and the wound coil 7 is fixed by impregnating with varnish or the like. All the coils 7 are all connected to the commutator 6. When the motor is operated, a current flows from the commutator 6 to the coil 7, and the coil 7 generates heat due to resistance loss. In order to efficiently release the heat generated by the coil 7, a cooling fan 5 is mounted on the rotating shaft 4, and the cooling fan 5 rotates in synchronization with the rotor 1. As shown in FIG. 5, the air flow generated by the cooling fan 5 flows to the motor through the air inlet 12 provided in the housing, and a part of the cooling air hits the coil end portions 7 a and 7 b exposed from the core 2 of the coil 7. The coil 7 is deprived of heat and discharged from the exhaust port 13 to the outside.
[0003]
[Problems to be solved by the invention]
The winding of the coil 7 is automated by a winding machine. In order to prevent the wire from protruding from the slot during winding, the wire is uniformly wound around each slot with an appropriate tension, and is wound around the slot. The coil bundle is controlled and wound so that the cross-sectional area of the coil bundle is minimized. At that time, since the coil end portions 7a and 7b having an important function of releasing the heat generated by the coil 7 are formed by superimposing the coil bundles, the surface areas of the coil end portions 7a and 7b are similarly formed to the minimum. In order to improve the heat dissipation performance, it is difficult to increase the surface area of the coil 7.
[0004]
The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, increase the heat radiation area of the coil end portion without changing the conventional manufacturing process and increase the number of components, and improve the heat radiation performance of the coil. .
[0005]
[Means for Solving the Problems]
The above object is achieved by providing an axial groove in the projecting portion of the end plate made of an insulating material located on the end surface of the core, and forming a heat radiating surface of the coil wound around the slot on both walls of the groove portion. .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
A rotor showing an embodiment of the present invention will be described with reference to FIG. The present invention is substantially the same as the above-described rotor except for the end plate of the core end face described below, and a description thereof will be omitted.
[0007]
It is a feature of the present invention that an axial groove 8 is provided in the protrusion 3a of the end plate 3 made of an insulating material located on both end faces of the core 2. The wire of the rotor 1 is inserted into an arbitrary slot in parallel with the rotating shaft 4 at the time of winding, and then inserted into the other slot in the same manner and wound around the groove 8 so that the groove 8 is wound around each slot. It is formed as a space sandwiched between the formed coils 7.
[0008]
As a result of the above configuration, the surface of the coil 7 that forms both walls in the axial direction of the space becomes the heat radiating surface 9, so that the heat radiating surface area of the coil end portions 7a and 7b is increased and the heat radiating performance of the coil 7 is improved. Can do. In FIG. 1 showing the above embodiment, the groove portion 8 of the end plate 3 is provided in both the cores 2, but it may be provided only in the one end plate 3.
[0009]
A rotor 1 according to another embodiment of the present invention is shown in FIG. A hole 10 is formed in the circumferential portion of the end plate 3 that forms the bottom of the groove 8 and the slot and communicates with the rotating shaft 4 on the coil ends 7a, 7b side. As a result, even when the varnish used for fixing the coil 7 is applied more than necessary, the varnish flows down to the rotating shaft 4 through the hole 10, so that the groove 8 is not buried by the varnish and the heat dissipation of the coil 7 is performed. Surface 9 is always formed.
[0010]
A rotor 1 according to still another embodiment of the present invention is shown in FIG. The rotor 1 is provided with an inclined portion 11 in which the axial direction surface of the slot bottom portion of the end plate 3 is lowered from the core 2 side to the coil end portions 7a and 7b. As a result, since the wire is wound along the inclined portion 11, the entire length of the coil is shortened by one length along the radial direction, the resistance value is reduced, and the heat generation amount of the coil 7 is reduced. Further, since the coil 7 is also inclined by the inclined portion 11, the exposed portion of the protruding portion 3b of the end plate 3 spreads, and when the rotor 1 rotates, the protruding portion 3b functions as a cooling fan to further improve the heat dissipation performance of the coil 7. Can do.
[0011]
【The invention's effect】
As described above, according to the present invention, since the axial groove is provided in the protruding portion of the end plate of the core end surface, both walls become a space formed by the coil in the groove, and the surface of the coil forming both walls Becomes a heat radiating surface, the heat radiating surface area of the coil at the coil end portion is increased, and the heat radiating performance of the coil can be improved. Further, the conventional end plate is provided with an extremely simple structure in which an axial groove is provided, so that an effective rotor can be provided at a low cost without changing the manufacturing process and without increasing the number of parts.
[Brief description of the drawings]
FIG. 1 is a partially sectional side view showing an embodiment of a rotor of the present invention.
FIG. 2 is a partial cross-sectional side view showing another embodiment of the rotor of the present invention.
FIG. 3 is a partial sectional side view showing still another embodiment of the rotor of the present invention.
FIG. 4 is a partial cross-sectional side view showing an example of a conventional rotor.
FIG. 5 is an explanatory side view showing the flow of airflow in the motor.
[Explanation of symbols]
1 is a rotor, 2 is a core, 3 is an end plate, 3a and 3b are protrusions of the end plate 3, 4 is a rotating shaft, 5 is a cooling fan, 6 is a commutator, 7a and 7b are coil ends, and 8 is an end An axial groove portion of the plate 3, 9 is a coil heat radiation surface portion, 10 is a hole, 11 is an inclined portion at the bottom of the slot of the end plate 3, 12 is an intake port, and 13 is an exhaust port.

Claims

A core having a plurality of slots attached to the rotating shaft and extending radially outward and extending along the axial direction, a coil wound along the axial direction in the slot of the core, and substantially the same shape as the slot of the core In the commutator motor having a plurality of protrusions that form a plurality of slots in the circumferential direction, made of an insulating material for maintaining insulation between the core and the coil, and having an end plate positioned on an end surface of the core, A rotor of a commutator motor, wherein a plurality of projections of the end plate are provided at intervals in the axial direction to form grooves that communicate with slots on both sides of the projection in the circumferential direction.

The rotation of the commutator motor according to claim 1, wherein a hole communicating with the groove and the coil end side exposed from the end surface of the core of the coil is provided on the radially inner side of the protrusion of the end plate. Child.

The rotor of the commutator motor according to claim 1, wherein a slot bottom portion of the end plate is inclined in the axial direction.