JP6119086B2 - Brushless motor cooling structure - Google Patents

Brushless motor cooling structure Download PDF

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JP6119086B2
JP6119086B2 JP2015162100A JP2015162100A JP6119086B2 JP 6119086 B2 JP6119086 B2 JP 6119086B2 JP 2015162100 A JP2015162100 A JP 2015162100A JP 2015162100 A JP2015162100 A JP 2015162100A JP 6119086 B2 JP6119086 B2 JP 6119086B2
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brushless motor
insulating member
cylindrical portion
ventilation
stator
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JP2015208228A (en
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宏司 松本
宏司 松本
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Panasonic Intellectual Property Management Co Ltd
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Description

本発明は、ブラシレスモータを放熱するための冷却構造に関するものである。   The present invention relates to a cooling structure for radiating heat from a brushless motor.

従来から、特許文献１等によって、ブラシレスモータを放熱するための冷却構造が提案されている。   Conventionally, a cooling structure for dissipating heat from a brushless motor has been proposed by Patent Document 1 and the like.

特許文献１のブラシレスモータでは、ステータ内で回転するロータにモータ軸が一体に設けられており、このモータ軸に取り付けた冷却用ファンによりステータ内に外気を導入することによって、ブラシレスモータの放熱を行う。   In the brushless motor of Patent Document 1, a motor shaft is integrally provided on a rotor that rotates in a stator, and heat is radiated from the brushless motor by introducing outside air into the stator by a cooling fan attached to the motor shaft. Do.

ステータは、円筒状の円筒部と円筒部の内周面から突出する複数の歯部とからなるステータ鉄心と、円筒部の内周面と軸方向端面と歯部とを被覆する絶縁性部材と、この絶縁性部材で被覆された各歯部に巻きつけたコイルとで構成されている。   The stator includes a stator core composed of a cylindrical cylindrical portion and a plurality of tooth portions protruding from the inner peripheral surface of the cylindrical portion, and an insulating member that covers the inner peripheral surface, the axial end surface, and the tooth portion of the cylindrical portion. And a coil wound around each tooth portion covered with this insulating member.

このブラシレスモータでは、円筒部の内周面のうち、周方向に隣り合う各歯部間の部分に絶縁性部材で被覆しない露出部を設けることによって、冷却用ファンによる放熱の効率化を図っている。   In this brushless motor, in the inner peripheral surface of the cylindrical portion, by providing an exposed portion that is not covered with an insulating member in a portion between each tooth portion adjacent in the circumferential direction, efficiency of heat radiation by the cooling fan is improved. Yes.

特開２００８−５４３９１号公報JP 2008-54391 A

しかし、上述のようにステータ鉄心の円筒部の内周面に絶縁性部材で被覆されていない露出部を設けると、絶縁性能が低下してしまうおそれがある。   However, if an exposed portion that is not covered with an insulating member is provided on the inner peripheral surface of the cylindrical portion of the stator iron core as described above, the insulation performance may be reduced.

そこで、上記事情を鑑みて、本発明は、簡単な構造で外気の導入をしやすくし、これによりブラシレスモータの放熱の促進を図ることができるブラシレスモータの冷却構造を提案することを課題とする。   Therefore, in view of the above circumstances, an object of the present invention is to propose a cooling structure for a brushless motor that facilitates introduction of outside air with a simple structure, and thereby can promote heat dissipation of the brushless motor. .

上記課題を達成する本発明は、ステータ内で回転するロータにモータ軸を一体に設け、前記モータ軸の一端側に冷却用ファンを取り付けたブラシレスモータの冷却構造であって、前記ステータは、略円筒状の円筒部とこの円筒部の内周面から突出した複数の歯部とからなるステータ鉄心と、前記円筒部の前記内周面と軸方向端面と前記歯部とを被覆する絶縁性部材と、前記絶縁性部材で被覆した前記各歯部に巻き付けたコイルとを備えてなり、前記絶縁性部材は、前記円筒部のうち前記冷却用ファンの回転に伴う風上側の前記軸方向端面を被覆し、前記絶縁性部材の前記風上側の前記軸方向端面を被覆する部分のうち、周方向に隣り合う前記各歯部間の箇所の厚みを小さくして、前記各歯部間に形成される空気流路に連続する通風用凹部を設けたことを特徴とする。 The present invention that achieves the above object provides a cooling structure for a brushless motor in which a motor shaft is integrally provided on a rotor that rotates in a stator, and a cooling fan is attached to one end of the motor shaft. A stator core composed of a cylindrical cylindrical portion and a plurality of tooth portions protruding from the inner peripheral surface of the cylindrical portion, and an insulating member that covers the inner peripheral surface, the axial end surface of the cylindrical portion, and the tooth portion. And a coil wound around each tooth portion covered with the insulating member, and the insulating member includes the axial end surface on the windward side of the cylindrical portion accompanying the rotation of the cooling fan. coated, said one of the windward said shaft portion covering the end face of the insulating member, the thickness of 箇 stations between the respective tooth portions circumferentially adjacent to small, formed between the respective teeth set the ventilation recesses continuous to the air passage to be Characterized in that was.

また、前記絶縁性部材のうち、周方向に隣り合う前記各歯部間の前記内周面を被覆する箇所に、前記円筒部の軸方向に沿って通風用溝部を設けることが好ましい。   Moreover, it is preferable to provide a ventilation groove portion along the axial direction of the cylindrical portion at a portion of the insulating member that covers the inner peripheral surface between the tooth portions adjacent to each other in the circumferential direction.

また、前記通風用凹部と前記通風用溝部を連続して設けることが好ましい。   Moreover, it is preferable to provide the ventilation recess and the ventilation groove continuously.

また、前記通風用溝部を複数設けることが好ましい。   In addition, it is preferable to provide a plurality of the ventilation grooves.

本発明のブラシレスモータの冷却構造は、簡単な構造で外気の導入をしやすくし、これによりブラシレスモータの放熱の促進を図ることができる。   The cooling structure of the brushless motor according to the present invention facilitates the introduction of the outside air with a simple structure, thereby promoting the heat dissipation of the brushless motor.

本発明の実施形態のブラシレスモータを示し、（ａ）は正面図であり、（ｂ）は回路基板と放熱部材と軸受とを省略した斜視図である。The brushless motor of embodiment of this invention is shown, (a) is a front view, (b) is the perspective view which abbreviate | omitted the circuit board, the heat radiating member, and the bearing. 同上のブラシレスモータを示す正面断面図である。It is front sectional drawing which shows a brushless motor same as the above. 同上のブラシレスモータを示す平面断面図である。It is a top sectional view showing a brushless motor same as the above.

本発明を添付図面に示す実施形態に基づいて説明する。   The present invention will be described based on embodiments shown in the accompanying drawings.

本実施形態のブラシレスモータは、例えばインパクトドライバ等の電動工具の駆動源として好適に用いられる。   The brushless motor of this embodiment is suitably used as a drive source for an electric tool such as an impact driver.

ブラシレスモータ１は、図１（ｂ）及び図２に示すように、ステータ３の内側にロータ２が配置されている。ロータ２は、略円柱状のロータ鉄心２０と、ロータ鉄心２０の径方向の中央部に挿通されて一体化されたモータ軸１０と、ロータ鉄心２０の内部に固定された４つのマグネット２１とから構成される。ロータ鉄心２０は、円形の薄鋼板を多数枚積層して形成される。４つのマグネット２１は、図３に示すように、それぞれ互いに所定の間隔をあけて配置されている。モータ軸１０はその両端部が軸受１１によって回転自在に支持される。また、モータ軸１０の一端側（図１（ａ）における左端側）には、モータ軸１０の軸方向に沿った流れを発生させる冷却用ファン７がモータ軸１０と一体となるように取り付けられている。本実施形態では、冷却用ファン７は、モータ軸１０の他端側から一端側へと流れを発生させるが、その逆の流れを発生させてもかまわない。   As shown in FIGS. 1B and 2, the brushless motor 1 has a rotor 2 disposed inside a stator 3. The rotor 2 includes a substantially cylindrical rotor core 20, a motor shaft 10 inserted and integrated in a central portion in the radial direction of the rotor core 20, and four magnets 21 fixed inside the rotor core 20. Composed. The rotor core 20 is formed by laminating a large number of circular thin steel plates. As shown in FIG. 3, the four magnets 21 are arranged at predetermined intervals from each other. Both ends of the motor shaft 10 are rotatably supported by bearings 11. A cooling fan 7 that generates a flow along the axial direction of the motor shaft 10 is attached to one end side of the motor shaft 10 (left end side in FIG. 1A) so as to be integrated with the motor shaft 10. ing. In the present embodiment, the cooling fan 7 generates a flow from the other end side of the motor shaft 10 to the one end side, but the reverse flow may be generated.

また、ステータ３の他端側（図１（ａ）における右側）には、回路基板８と放熱部材９が配置されている。放熱部材９は、ねじ等の固定具１２によってステータ３に固定され、回路基板８は放熱部材９にねじ等によって固定されている。回路基板８は、図１（ａ）に示すように、ステータ３から軸方向に所定の隙間をおいた位置に配置されている。なお、放熱部材９は、ステータ３側に突出する脚部９０と、ステータ３側とは反対側に突出する多数の放熱フィン９１とを備える。この脚部９０に固定具１２が固定される。   A circuit board 8 and a heat radiating member 9 are disposed on the other end side of the stator 3 (the right side in FIG. 1A). The heat radiating member 9 is fixed to the stator 3 by a fixing tool 12 such as a screw, and the circuit board 8 is fixed to the heat radiating member 9 by a screw or the like. As shown in FIG. 1A, the circuit board 8 is disposed at a position with a predetermined gap from the stator 3 in the axial direction. The heat dissipating member 9 includes leg portions 90 projecting toward the stator 3 and a large number of heat dissipating fins 91 projecting opposite to the stator 3 side. The fixing tool 12 is fixed to the leg portion 90.

ステータ３は、図３に示すように、ステータ鉄心４と絶縁性部材５とコイル６とから構成される。ステータ鉄心４は、略円筒状の円筒部４０と円筒部４０の内周面４１から径方向内側に向けて突出した複数（図では６つ）の歯部４２からなる。６つの歯部４２は、内周面４１を周方向に６等分した位置に、それぞれ互いに所定の間隔をあけて配置される。そして、絶縁性部材５は、図１（ｂ）及び図３に示すように、円筒部４０の軸方向端面４３，４４と円筒部４０の内周面４１と複数の歯部４２の先端面４５を除いた部分を被覆している。絶縁性部材５で被覆された複数の歯部４２には、それぞれコイル６が巻き付けられている。コイル６は、回路基板８によって通電が制御される。回路基板８には、ロータ２の磁極の位置を検出するための磁気センサ（図示せず）を備えており、この磁気センサの検出結果を元に、コイル６への通電制御を行い、ロータ２（モータ軸１０）を回転させる。   As shown in FIG. 3, the stator 3 includes a stator iron core 4, an insulating member 5, and a coil 6. The stator iron core 4 includes a substantially cylindrical cylindrical portion 40 and a plurality (six in the figure) of tooth portions 42 protruding inward in the radial direction from the inner peripheral surface 41 of the cylindrical portion 40. The six tooth portions 42 are arranged at predetermined intervals from each other at positions obtained by dividing the inner peripheral surface 41 into six equal parts in the circumferential direction. As shown in FIGS. 1B and 3, the insulating member 5 includes axial end surfaces 43 and 44 of the cylindrical portion 40, an inner peripheral surface 41 of the cylindrical portion 40, and distal end surfaces 45 of the plurality of tooth portions 42. The part except for is covered. A coil 6 is wound around each of the plurality of tooth portions 42 covered with the insulating member 5. Energization of the coil 6 is controlled by the circuit board 8. The circuit board 8 is provided with a magnetic sensor (not shown) for detecting the position of the magnetic pole of the rotor 2, and energization control for the coil 6 is performed based on the detection result of the magnetic sensor, and the rotor 2. (Motor shaft 10) is rotated.

ステータ鉄心４は、薄鋼板が多数積層されて形成されている。ステータ鉄心４を構成する多数の薄鋼板はそれぞれ、四隅に位置合わせ用孔４６を備えており、ここに固定具１２を挿入することで一体化される。   The stator core 4 is formed by laminating a large number of thin steel plates. A large number of thin steel plates constituting the stator core 4 are each provided with alignment holes 46 at the four corners, and are integrated by inserting the fixture 12 therein.

ステータ鉄心４を被覆する絶縁性部材５についてさらに詳しく説明する。   The insulating member 5 that covers the stator core 4 will be described in more detail.

絶縁性部材５は、ステータ鉄心４を電気的に絶縁するいわゆるインシュレータと呼ばれる合成樹脂製のものである。図１（ｂ）に示すように、絶縁性部材５のうち円筒部４０の他端側（回路基板８側）の軸方向端面４３を被覆する箇所には、一端側（冷却用ファン７側）に凹んだ通風用凹部５０が複数（本実施形態では６つ）形成されている。本実施形態では、この軸方向端面４３を被覆する絶縁性部材５は、円環状をなしている。通風用凹部５０は、この円環状の絶縁性部材５のうち、ステータ鉄心４の円筒部４０の周方向に隣り合う各歯部４２間の中央となる部分に配置されている。   The insulating member 5 is made of a synthetic resin called an insulator that electrically insulates the stator core 4. As shown in FIG. 1B, the insulating member 5 has one end side (cooling fan 7 side) at a portion covering the axial end surface 43 on the other end side (circuit board 8 side) of the cylindrical portion 40. A plurality of ventilation recesses 50 (six in this embodiment) are formed. In the present embodiment, the insulating member 5 covering the axial end surface 43 has an annular shape. The ventilation recess 50 is disposed in a portion of the annular insulating member 5 at the center between the tooth portions 42 adjacent to each other in the circumferential direction of the cylindrical portion 40 of the stator core 4.

さらに、本実施形態では、図１（ｂ）及び図３に示すように、絶縁性部材５のうち円筒部４０の内周面４１には、周方向に隣り合う各歯部４２間の中央となる箇所に、円筒部４０の径方向外側に凹んだ通風用溝部５１が形成されている。通風用溝部５１は、円筒部４０の軸方向に沿って、円筒部４０の全長に亘るように形成されている。本実施形態では、この通風用溝部５１は６つ形成されており、それぞれ通風用凹部５０に連続している。   Furthermore, in this embodiment, as shown in FIG.1 (b) and FIG. 3, in the inner peripheral surface 41 of the cylindrical part 40 among the insulating members 5, the center between each tooth part 42 adjacent to the circumferential direction is provided. A ventilation groove 51 that is recessed outward in the radial direction of the cylindrical portion 40 is formed. The ventilation groove 51 is formed so as to extend over the entire length of the cylindrical portion 40 along the axial direction of the cylindrical portion 40. In this embodiment, six ventilation grooves 51 are formed, and each of the ventilation grooves 51 is continuous with the ventilation recess 50.

上述した本実施形態のブラシレスモータ１では、以下のようにして放熱が行われる。   In the brushless motor 1 of this embodiment mentioned above, heat radiation is performed as follows.

すなわち、回路基板８によって通電制御を行うことによって、ロータ２が回転する。このとき、ロータ２と共にモータ軸１０が回転し、モータ軸１０に一体に取り付けられた冷却用ファン７が回転して、モータ軸１０に沿って回路基板８側から冷却用ファン７側へと流れる風が発生する。   That is, by performing energization control by the circuit board 8, the rotor 2 rotates. At this time, the motor shaft 10 rotates together with the rotor 2, and the cooling fan 7 integrally attached to the motor shaft 10 rotates and flows from the circuit board 8 side to the cooling fan 7 side along the motor shaft 10. Wind is generated.

ここで、本実施形態では、ステータ鉄心４の軸方向端面４３を覆う絶縁性部材５に、冷却用ファン７側に凹んだ通風用凹部５０を形成しているため、この部分で、回路基板８とステータ３との間の外気が通過するための隙間が広くなる。そのため、この隙間からステータ３内に導入する外気の量を増大させることができる。そして、本実施形態では、この通風用凹部５０を、周方向に隣り合う各歯部４２間に位置させたことで、この周方向に隣り合う各歯部４２間に形成される空気通路と通風用凹部５０とが連続することとなり、スムーズに外気をこの空気通路へと導入することができる。このようにステータ３内に導入する外気の量を増大させるとともにスムーズに導入可能としたことで、ブラシレスモータ１の特に回路基板８の放熱を効率良く行うことができる。   Here, in this embodiment, the insulating member 5 that covers the axial end surface 43 of the stator core 4 is formed with the ventilation recess 50 that is recessed toward the cooling fan 7. The gap for the outside air to pass between the stator 3 and the stator 3 is widened. Therefore, the amount of outside air introduced into the stator 3 from this gap can be increased. In the present embodiment, the ventilation recess 50 is positioned between the tooth portions 42 adjacent in the circumferential direction, so that the air passage and the ventilation formed between the tooth portions 42 adjacent in the circumferential direction. The concave portion for use 50 is continuous, and the outside air can be smoothly introduced into the air passage. As described above, by increasing the amount of outside air introduced into the stator 3 and enabling smooth introduction, the heat of the brushless motor 1, particularly the circuit board 8, can be efficiently radiated.

さらに本実施形態では、ステータ鉄心４の内周面４１を覆う絶縁性部材５に、径方向外側に凹んだ通風用溝部５１を、軸方向に沿って円筒部４０の全長に亘るように設けているため、周方向に隣り合う各歯部４２間の空気通路の流路面積を増大させることができる。これによりステータ３内に導入する外気量を増やすことができ、ブラシレスモータ１の特にコイル６の放熱を効率良く行うことができる。   Further, in the present embodiment, the insulating member 5 that covers the inner peripheral surface 41 of the stator core 4 is provided with a ventilation groove 51 that is recessed radially outward so as to cover the entire length of the cylindrical portion 40 along the axial direction. Therefore, the flow path area of the air passage between the respective tooth portions 42 adjacent in the circumferential direction can be increased. As a result, the amount of outside air introduced into the stator 3 can be increased, and in particular, the heat radiation of the coil 6 of the brushless motor 1 can be efficiently performed.

また、本実施形態では、この通風用凹部５０と通風用溝部５１とを連続して設けたことで、通風用凹部５０から通風用溝部５１へと外気をスムーズに導入できる。これによっても、ブラシレスモータ１の放熱の効率化を図ることができる。   Further, in the present embodiment, by providing the ventilation recess 50 and the ventilation groove 51 continuously, the outside air can be smoothly introduced from the ventilation recess 50 to the ventilation groove 51. Also by this, the efficiency of heat dissipation of the brushless motor 1 can be improved.

以上まとめると、本実施形態のブラシレスモータ１の冷却構造は、ステータ３内で回転するロータ２にモータ軸１０が一体に設けられ、モータ軸１０の一端側に冷却用ファン７が取り付けられている。ステータ３は、ステータ鉄心４と絶縁性部材５とコイル６とを備えてなる。ステータ鉄心４は、略円筒状の円筒部４０と円筒部４０の内周面４１から突出した複数の歯部４２とからなる。絶縁性部材５は、円筒部４０の内周面４１と軸方向端面４３，４４と歯部４２とを被覆している。コイル６は、絶縁性部材５で被覆した各歯部４２に巻き付けられている。この絶縁性部材５のうち、周方向に隣り合う各歯部４２間の冷却用ファン７側とは反対側の軸方向端面４３を被覆する箇所に、通風用凹部５０を設けている。   In summary, in the cooling structure of the brushless motor 1 according to the present embodiment, the motor shaft 10 is integrally provided on the rotor 2 that rotates in the stator 3, and the cooling fan 7 is attached to one end side of the motor shaft 10. . The stator 3 includes a stator core 4, an insulating member 5, and a coil 6. The stator iron core 4 includes a substantially cylindrical cylindrical portion 40 and a plurality of tooth portions 42 protruding from the inner peripheral surface 41 of the cylindrical portion 40. The insulating member 5 covers the inner peripheral surface 41, the axial end surfaces 43 and 44, and the tooth portion 42 of the cylindrical portion 40. The coil 6 is wound around each tooth portion 42 covered with the insulating member 5. In this insulating member 5, a ventilation recess 50 is provided at a portion covering the axial end surface 43 opposite to the cooling fan 7 side between the respective tooth portions 42 adjacent in the circumferential direction.

このように本実施形態では、絶縁性部材５のうち、冷却用ファン７側とは反対側の軸方向端面４３を被覆する箇所に、通風用凹部５０を設けることによって、この箇所における通過可能な空気量を増大させることができる。そして、この通風用凹部５０を周方向に隣り合う各歯部４２間に位置させることで、この各歯部４２間に形成される空気通路とこの空気通路に連続する通風用凹部５０とに、スムーズな流れで空気を通過させることができる。これにより、本願発明では、簡単な構造で外気の導入をしやすくして、これによりブラシレスモータ１の放熱を促進することができる。   As described above, in this embodiment, by providing the ventilation recess 50 in the insulating member 5 where the axial end surface 43 opposite to the cooling fan 7 side is covered, it is possible to pass through this portion. The amount of air can be increased. Then, by positioning the ventilation recess 50 between the tooth portions 42 adjacent in the circumferential direction, the air passage formed between the tooth portions 42 and the ventilation recess 50 continuous to the air passage, Air can be passed with a smooth flow. Thereby, in this invention, it is easy to introduce external air with a simple structure, and thereby heat dissipation of the brushless motor 1 can be promoted.

また、本実施形態のブラシレスモータ１の冷却構造は、絶縁性部材５のうち、周方向に隣り合う各歯部４２間の内周面４１を被覆する箇所に、円筒部４０の軸方向に沿った通風用溝部５１を設けている。   Moreover, the cooling structure of the brushless motor 1 according to the present embodiment is arranged along the axial direction of the cylindrical portion 40 at a portion of the insulating member 5 that covers the inner peripheral surface 41 between the respective tooth portions 42 adjacent in the circumferential direction. A ventilation groove 51 is provided.

このような構成とすることで、本実施形態では、周方向に隣り合う各歯部４２間に形成される空気通路の流路面積を、通風用溝部５１によって増大させることができる。そのため、円筒部４０内側に導入可能な空気量を増大させて、ブラシレスモータ１の放熱を促進することができる。   With this configuration, in the present embodiment, the flow passage area of the air passage formed between the respective tooth portions 42 adjacent in the circumferential direction can be increased by the ventilation groove portion 51. Therefore, the amount of air that can be introduced into the inside of the cylindrical portion 40 can be increased, and heat dissipation of the brushless motor 1 can be promoted.

なお、他の実施形態として、ブラシレスモータ１は、通風用凹部５０のみを備え、通風用溝部５１を備えていないものであってもかまわない。また、ブラシレスモータ１は、通風用凹部５０及び通風用溝部５１を１〜５箇所設けたものであってもよい。   As another embodiment, the brushless motor 1 may be provided with only the ventilation recess 50 and not the ventilation groove 51. Further, the brushless motor 1 may be provided with 1 to 5 ventilation recesses 50 and ventilation grooves 51.

以上、本発明を添付図面に示す実施形態に基づいて説明したが、本発明は上記の各実施形態に限定されるものではなく、本発明の意図する範囲内であれば、適宜の設計変更が可能である。   Although the present invention has been described based on the embodiments shown in the accompanying drawings, the present invention is not limited to the above-described embodiments, and appropriate design changes can be made within the intended scope of the present invention. Is possible.

１ ブラシレスモータ
２ ロータ
３ ステータ
４ ステータ鉄心
５ 絶縁性部材
６ コイル
７ 冷却用ファン
１０ モータ軸
４０ 円筒部
４１ 内周面
４２ 歯部
４３ 軸方向端面
４４ 軸方向端面
５０ 通風用凹部
５１ 通風用溝部 DESCRIPTION OF SYMBOLS 1 Brushless motor 2 Rotor 3 Stator 4 Stator core 5 Insulating member 6 Coil 7 Cooling fan 10 Motor shaft 40 Cylindrical part 41 Inner peripheral surface 42 Tooth part 43 Axial end face 44 Axial end face 50 Ventilation recessed part 51 Ventilation groove part

Claims (4)

ステータ内で回転するロータにモータ軸を一体に設け、前記モータ軸の一端側に冷却用ファンを取り付けたブラシレスモータの冷却構造であって、
前記ステータは、略円筒状の円筒部とこの円筒部の内周面から突出した複数の歯部とからなるステータ鉄心と、前記円筒部の前記内周面と軸方向端面と前記歯部とを被覆する絶縁性部材と、前記絶縁性部材で被覆した前記各歯部に巻き付けたコイルとを備えてなり、
前記絶縁性部材は、前記円筒部のうち前記冷却用ファンの回転に伴う風上側の前記軸方向端面を被覆し、
前記絶縁性部材の前記風上側の前記軸方向端面を被覆する部分のうち、周方向に隣り合う前記各歯部間の箇所の厚みを小さくして、前記各歯部間に形成される空気流路に連続する通風用凹部を設けたことを特徴とするブラシレスモータの冷却構造。 A brushless motor cooling structure in which a motor shaft is integrally provided on a rotor rotating in a stator, and a cooling fan is attached to one end of the motor shaft,
The stator includes a stator core composed of a substantially cylindrical cylindrical portion and a plurality of tooth portions protruding from the inner peripheral surface of the cylindrical portion, the inner peripheral surface of the cylindrical portion, the axial end surface, and the tooth portion. An insulating member to be coated; and a coil wound around each tooth portion covered with the insulating member;
The insulating member covers the axial end surface on the windward side associated with the rotation of the cooling fan in the cylindrical portion,
Wherein one of the windward said shaft portion covering the end face of the insulating member, the air that the thickness of the 箇 stations between the respective tooth portions circumferentially adjacent to small, is formed between the respective teeth A cooling structure for a brushless motor, wherein a recess for ventilation is provided in the flow path . 前記絶縁性部材のうち、周方向に隣り合う前記各歯部間の前記内周面を被覆する箇所に、前記円筒部の軸方向に沿って通風用溝部を設けたことを特徴とする請求項１に記載のブラシレスモータの冷却構造。   The ventilation groove portion is provided along the axial direction of the cylindrical portion at a portion of the insulating member that covers the inner peripheral surface between the tooth portions adjacent in the circumferential direction. The cooling structure of the brushless motor according to 1. 前記通風用凹部と前記通風用溝部を連続して設けたことを特徴とする請求項２に記載のブラシレスモータの冷却構造。   3. The brushless motor cooling structure according to claim 2, wherein the ventilation recess and the ventilation groove are provided continuously. 前記通風用溝部を複数設けたことを特徴とする請求項２または３に記載のブラシレスモータの冷却構造。   4. The brushless motor cooling structure according to claim 2, wherein a plurality of the ventilation grooves are provided.
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