JP5186899B2 - Brushless motor - Google Patents

Brushless motor Download PDF

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JP5186899B2
JP5186899B2 JP2007306760A JP2007306760A JP5186899B2 JP 5186899 B2 JP5186899 B2 JP 5186899B2 JP 2007306760 A JP2007306760 A JP 2007306760A JP 2007306760 A JP2007306760 A JP 2007306760A JP 5186899 B2 JP5186899 B2 JP 5186899B2
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brushless motor
bracket
heat
stator core
circuit board
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JP2009131127A (en
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弘規 佐藤
宗生 山本
武彦 長谷川
勇治 熊谷
治彦 角
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Priority to JP2007306760A priority Critical patent/JP5186899B2/en
Priority to CNU2008201362832U priority patent/CN201349153Y/en
Priority to RU2008138694/22U priority patent/RU90945U1/en
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Description

本発明は、空気調和機等のファンブラシレスモータの制御駆動の出力素子の放熱構造に関する。   The present invention relates to a heat dissipation structure of an output element for controlling and driving a fan brushless motor such as an air conditioner.

従来、空気調和機等に使用されるファンブラシレスモータは、ブラシレスモータの制御駆動の出力素子の消費する電力により、素子自体が発熱をし、発熱量が大きくなると素子の温度上昇が限界値にまで達し、ついてはその発熱により加熱保護装置が働き素子自体の機能が停止してしまい、ブラシレスモータの機能が停止するという課題があった。この課題を解決するために制御駆動の出力素子の発熱を素子が取り付けられている回路基盤と相対して向かい合い位置している鉄製の反軸出力ブラケットに熱伝導樹脂を介して放熱させていた。   Conventionally, fan brushless motors used in air conditioners, etc., generate heat by the power consumed by the output elements of the brushless motor control drive, and when the amount of heat generation increases, the temperature rise of the elements reaches the limit value. Therefore, there is a problem that the heat protection device works and the function of the element itself stops due to the heat generation, and the function of the brushless motor stops. In order to solve this problem, the heat generated by the control-driven output element is dissipated through the heat conductive resin to the iron anti-axis output bracket located opposite to the circuit board on which the element is mounted.

図２は従来のモールドされたブラシレスモータを示している。固定子鉄心５にインシュレータ（符号なし）を設けて巻線２を施して固定子鉄心巻線組立部（符号なし）を構成していた。固定子鉄心巻線組立部は、樹脂４により一体成型されてモールドモータの一構造体をなす。回転子鉄心６に、軸５、マグネット（符号なし）が一体化され、軸受８が前記軸５の両端に設けられる。モールド成型された固定子鉄心巻線組立部に、図２に示すように、回転子鉄心６を納め、ブラシレスモータのドライバＩＣ、電解コンデンサ等各種電子部品がはんだ付け実装された回路基板１０を配したのち、反軸出力ブラケット１１を取り付けてモールドされたブラシレスモータが完成する。なお、ブラシレスモータのドライバＩＣ、電解コンデンサ等の電子部品は図示していない。   FIG. 2 shows a conventional molded brushless motor. The stator core 5 is provided with an insulator (no symbol) and the winding 2 is applied to constitute a stator core winding assembly (no symbol). The stator core winding assembly is integrally molded with resin 4 to form a structure of a molded motor. A shaft 5 and a magnet (not shown) are integrated with the rotor core 6, and bearings 8 are provided at both ends of the shaft 5. As shown in FIG. 2, a rotor core 6 is placed in a molded stator core winding assembly, and a circuit board 10 on which various electronic components such as a brushless motor driver IC and an electrolytic capacitor are mounted by soldering is disposed. After that, the brushless motor molded by attaching the anti-axis output bracket 11 is completed. Note that electronic components such as a brushless motor driver IC and electrolytic capacitor are not shown.

図２において、従来のモールドされたブラシレスモータは、ブラシレスモータのドライバＩＣ、電解コンデンサ等の電子部品をはんだ付け実装した回路基板１０をモールド成型しないことにより、前記ブラシレスモータは、固定子鉄心巻線組立部、回路基板１０、回転子鉄心６、反軸出力ブラケット１１、これらの各構成要素が分解可能な構成である。また、ブラシレスモータのドライバＩＣ、電解コンデンサ等の電子部品をはんだ付け実装した回路基板１０は、樹脂４に樹脂封止されない構成のため、樹脂の内部応力が加わることもない。図２に示すように、モールド成型された固定子鉄心巻線組立部に、前記回転子鉄心６及び回路基板１０を、モールド成型された固定子鉄心巻線組立部に納めた後に、反軸出力ブラケット１２をモールド成型された固定子鉄心巻線組立部の反軸出力側に取り付ける構成である。   In FIG. 2, the conventional molded brushless motor does not mold the circuit board 10 on which electronic components such as a driver IC of a brushless motor and an electrolytic capacitor are mounted by soldering, so that the brushless motor has a stator core winding. The assembly portion, the circuit board 10, the rotor core 6, the anti-axis output bracket 11, and these components can be disassembled. The circuit board 10 on which electronic components such as a brushless motor driver IC and an electrolytic capacitor are soldered and mounted is not sealed with the resin 4, so that internal stress of the resin is not applied. As shown in FIG. 2, after the rotor core 6 and the circuit board 10 are placed in the molded stator core winding assembly in the molded stator core winding assembly, anti-axis output is performed. The bracket 12 is attached to the opposite axis output side of the molded stator core winding assembly.

モールドされたブラシレスモータを分解する際には、反軸出力ブラケット１１を取り外すことにより、回路基板１０、回転子鉄心８を容易に取り出せる構造のため、反軸出力ブラケット１１、回路基板１０、回転子鉄心８に関しての分解は極めて簡便である。   When the molded brushless motor is disassembled, the circuit board 10 and the rotor core 8 can be easily taken out by removing the anti-axis output bracket 11, so that the anti-axis output bracket 11, the circuit board 10, and the rotor are removed. Decomposition of the iron core 8 is very simple.

つぎに、回路基板１０と固定子鉄心組立部との接続の詳細を説明する。固定子鉄心巻線組立部の構成要素であるインシュレータに取り付け基板固定用の突起部を予め設け、固定子鉄心巻線組立部のモールド成型時には、前記基板固定用の突起部が樹脂から露出するようにモールド成型を行い、回路基板１０の取り付けに際しては、回路基板１０に、予め設けた取り付け孔部に前記基板固定用の突起部を挿入して、取り付け孔部から突出した前記基板固定用の突起部の先端部を加熱して、偏平に変形させることにより、簡単に回路基板１０を固定子鉄心巻線組立部に固定できる。インシュレータには、熱可塑性樹脂を用いている。   Next, details of the connection between the circuit board 10 and the stator core assembly are described. A protrusion for fixing the mounting board is provided in advance on the insulator, which is a constituent element of the stator core winding assembly, and when the stator core winding assembly is molded, the protrusion for fixing the board is exposed from the resin. When the circuit board 10 is attached to the circuit board 10, the board fixing protrusion protrudes from the mounting hole by inserting the board fixing protrusion into the mounting hole provided in advance in the circuit board 10. The circuit board 10 can be easily fixed to the stator core winding assembly part by heating the tip of the part and deforming it flatly. A thermoplastic resin is used for the insulator.

固定子鉄心巻線組立部の構成要素であるインシュレータには、巻線４が接続される巻線用接続用端子を予め設け、固定子鉄心巻線組立のモールド成型時に、前記巻線用接続用端子が樹脂４から露出するようにモールド成型を行い、回路基板１０の取り付けに際しては、回路基板１０に、予め設けた接続孔部に前記巻線用接続用端子を挿入して、接続孔部から突出した巻線用接続用端子の先端部と回路基板１０の接続孔部の周囲のランドとをはんだ付けすることにより、回路基板１０と巻線２の電気的接続が極めて容易に行える。なお、前記巻線用接続用端子は導電性を有する。   The insulator, which is a constituent element of the stator core winding assembly, is provided with a connection terminal for winding to which the winding 4 is connected in advance, and when the stator core winding assembly is molded, the connection for the winding is performed. Molding is performed so that the terminals are exposed from the resin 4, and when the circuit board 10 is attached, the winding connection terminals are inserted into the connection holes provided in advance in the circuit board 10. By soldering the protruding tip of the connecting terminal for winding and the land around the connection hole of the circuit board 10, the circuit board 10 and the winding 2 can be electrically connected very easily. The winding connection terminal has conductivity.

樹脂４の材料について明記しなかったが、回路基板１０をモールド成型しないことにより、回路基板にはんだ付け実装されたブラシレスモータのドライバＩＣ等の各種電子部品による温度制約が無く、成型温度が比較的低い熱硬化性樹脂だけでなく、成型温度が高い熱可塑性樹脂でも使用可能である。熱硬化性樹脂、熱可塑性樹脂のいずれでも可能である。   Although the material of the resin 4 was not specified, by not molding the circuit board 10, there is no temperature restriction due to various electronic components such as a brushless motor driver IC soldered to the circuit board, and the molding temperature is relatively low. Not only a low thermosetting resin but also a thermoplastic resin having a high molding temperature can be used. Either a thermosetting resin or a thermoplastic resin is possible.

上述したように、従来のブラシレスモータは、産業的価値の大きな特性を有して、優れたものであったが、ファン負荷が増し、それに伴いモータ巻線電流が増加すると、制御駆動の出力素子で消費される電力が多くなり、制御駆動の出力素子の発熱量がさらに大きくなる。これにより制御駆動の出力素子から、樹脂を介しての鉄製のブラケットへの放熱では放熱効果が不十分となっていた。   As described above, the conventional brushless motor has excellent industrial characteristics and is excellent. However, when the fan load increases and the motor winding current increases accordingly, the output element of the control drive In this case, the amount of power consumed by the control element increases, and the amount of heat generated by the control-driven output element further increases. As a result, heat dissipation from the control-driven output element to the iron bracket via the resin has been insufficient.

このため、従来のブラシレスモータにおいて、ブラケットの外気面側に放熱フィンをさらに付加し、放熱の熱抵抗を低減しする構成もあった。しかし、制御駆動の出力素子と放熱フィンとの間にブラケットを介しているために、このブラケットが熱抵抗層となっていた。さらには、制御駆動の出力素子とブラケットとの境界面にも熱抵抗層が生じること、ブラケットと放熱フィンとの境界面にも熱抵抗層を生じることになり、この２つの熱抵抗層も介することから、放熱の熱抵抗の低減にも限界があるという課題を有していた。   For this reason, in the conventional brushless motor, there is a configuration in which a heat radiation fin is further added to the outside air surface side of the bracket to reduce the heat resistance of heat radiation. However, since the bracket is interposed between the control-drive output element and the heat radiating fin, the bracket is a thermal resistance layer. Furthermore, a thermal resistance layer is also generated at the boundary surface between the control drive output element and the bracket, and a thermal resistance layer is also generated at the boundary surface between the bracket and the radiating fin, and these two thermal resistance layers are also interposed. For this reason, there has been a problem that there is a limit in reducing the thermal resistance of heat dissipation.

また、ブラケットと放熱フィンとを一体化した構造とした場合には、その材質をブラケットに適した材料又は放熱フィンに適した材料のいずれかとなるため、機械的強度又は熱抵抗のいずれかに課題が生じていた。さらには、ブラケットと放熱フィンとを一体化した構造では、寸法精度の条件を満たすための製造コストの増加を招いて、産業的価値が乏しくなるものであった。
特開２００７−６６０３号公報 Also, when the bracket and the radiating fin are integrated, the material is either a material suitable for the bracket or a material suitable for the radiating fin, so there is a problem in either mechanical strength or thermal resistance. Has occurred. Furthermore, in the structure in which the bracket and the heat radiating fin are integrated, an increase in manufacturing cost for satisfying the dimensional accuracy condition is caused and the industrial value becomes poor.
JP 2007-6603 A

上述したように、ファン負荷が増し、それに伴いブラシレスモータの巻線電流が増加すると、制御駆動の出力素子で消費される電力が多くなり、制御駆動の出力素子の発熱量がさらに大きくなる。これにより制御駆動の出力素子から、樹脂を介しての鉄製等のブラケットへの放熱では放熱が不十分となり、制御駆動の出力素子が温度上昇の限界に至り、加熱保護装置の働きにより素子の機能が停止し、ブラシレスモータの機能が停止するという課題を解決するために、ブラシレスモータの放熱の熱抵抗の低減を図りながら、製造コストの過大な増加をも回避する構成を得ることが本件出願の課題である。   As described above, when the fan load increases and the winding current of the brushless motor increases accordingly, the power consumed by the control drive output element increases, and the amount of heat generated by the control drive output element further increases. As a result, heat dissipation from the control drive output element to the bracket made of iron or the like through resin becomes insufficient, and the control drive output element reaches the limit of the temperature rise. In order to solve the problem that the function of the brushless motor stops, it is possible to obtain a configuration that avoids an excessive increase in manufacturing cost while reducing the thermal resistance of heat dissipation of the brushless motor. It is a problem.

上記課題を解決するために本件出願に係る第１の発明は、固定子鉄心と巻線とを有する固定子鉄心巻線組立部と、前記固定子鉄心巻線組立部に軸受けの収納を形成する軸出側のブラケットが樹脂でモールドされたモールド組立に、固定子鉄心内周面とギャップを介して回転自在に回転する回転子が挿入され、ブラシレスモータを駆動する回路基板が取り付け収納された前記モールド組立に、反軸出側外側から反軸出側の軸受の収納を形成するブラケットを取り付け、そのブラケットに孔部を設けることで外部よりこの孔部に挿入可能な突起部を含む前記ブラケットの材質よりも熱伝導性の優れた材質の放熱フィンを前記ブラケットに固定し、前記放熱フィンの突起部が熱伝導樹脂を介してブラシレスモータの制御駆動の出力素子に接する構成を具備するブラシレスモータである。   In order to solve the above-mentioned problems, a first invention according to the present application is to form a stator core winding assembly having a stator core and a winding, and form a housing for a bearing in the stator core winding assembly. A rotor assembly that rotates freely through a gap between the stator core inner peripheral surface and a gap is inserted into a mold assembly in which a bracket on the axial side is molded with resin, and a circuit board that drives a brushless motor is mounted and accommodated. A bracket that forms a housing for the bearing on the anti-axial side from the outer side of the anti-axial side is attached to the mold assembly, and the bracket includes a protrusion that can be inserted into the hole from the outside by providing a hole in the bracket. A structure in which a heat dissipation fin made of a material having a thermal conductivity superior to that of the material is fixed to the bracket, and a protrusion of the heat dissipation fin is in contact with an output element of a brushless motor control drive through a heat conductive resin. A brushless motor that includes.

また、本件出願に係る第２の発明は、固定子鉄心と巻線とを有する固定子鉄心巻線組立部と、前記固定子鉄心巻線組立部に軸受けの収納を形成する軸出側のブラケットが樹脂でモールドされたモールド組立に、固定子鉄心内周面とギャップを介して回転自在に回転する回転子が挿入され、ブラシレスモータを駆動する回路基板が取り付け収納された前記モールド組立に、反軸出側外側から反軸出側の軸受の収納を形成するブラケットを取り付け、そのブラケットに孔部を設けることで外部よりこの孔部に挿入可能な突起部を含む前記ブラケットの材質よりも熱伝導性の優れた材質の放熱フィンを前記ブラケットに固定し、前記放熱フィンの突起部が熱伝導樹脂を介してブラシレスモータの制御駆動の出力素子に接する構成を備え、制御駆動の出力素子（パワースイッチング素子）の発熱を前記放熱フィンの熱放散部に伝達し、前記熱放散部を介してブラシレスモータ外部に放熱させ、ブラシレスモータの出力軸の負荷側で発生させる送風効果で生じる気流の流れが前記放熱フィンの熱放散部近傍を通過することで冷却効果を高める構成を有するブラシレスモータである。   According to a second aspect of the present application, there is provided a stator core winding assembly portion having a stator core and a winding, and a bracket on a shaft side forming a housing for a bearing in the stator core winding assembly portion. The mold assembly molded with resin is inserted with a rotor that rotates freely through the gap between the stator core inner peripheral surface and the gap. A bracket that forms the housing of the bearing on the non-axial side from the outside of the axial side is attached, and a hole is provided in the bracket, so that heat conduction is greater than the material of the bracket including a protrusion that can be inserted into this hole from the outside. The heat dissipating fin made of an excellent material is fixed to the bracket, and the protrusion of the heat dissipating fin is in contact with the control drive output element of the brushless motor through the heat conductive resin. The heat generated by the force element (power switching element) is transmitted to the heat dissipating part of the radiating fin, radiated to the outside of the brushless motor through the heat dissipating part, and generated by the air blowing effect generated on the load side of the output shaft of the brushless motor. The brushless motor has a configuration in which a cooling effect is enhanced by allowing the airflow to pass through the vicinity of the heat dissipating portion of the radiating fin.

また、本件出願に係る第３の発明は、上記第１の発明又は第２の発明において、前記放熱フィンの材質をアルミニウムとした構成のブラシレスモータである。   A third invention according to the present application is a brushless motor having a structure in which the material of the heat dissipating fin is aluminum in the first invention or the second invention.

また、本件出願に係る第４の発明は、上記第１の発明又は第２の発明において、風の流れに沿って放射状にフィンが形成された構造を有する放熱フィンを具備するブラシレスモータである。   Further, a fourth invention according to the present application is a brushless motor including heat dissipating fins having a structure in which fins are formed radially along a wind flow in the first invention or the second invention.

また、本件出願に係る第５の発明は、上記第１の発明又は第２の発明において、前記熱伝導樹脂の材質を熱伝導性のシリコン樹脂とした構成のブラシレスモータである。   According to a fifth aspect of the present invention, there is provided a brushless motor having a structure in which the material of the heat conductive resin is a heat conductive silicon resin in the first or second invention.

また、本件出願に係る第６の発明は、上記第１の発明から第５の発明によるブラシレスモータを搭載する空気調和機である。   A sixth invention according to the present application is an air conditioner equipped with the brushless motor according to the first to fifth inventions.

本発明のブラシレスモータの、制御駆動の出力素子の放熱構造によれば、外付けの熱伝導性に優れた放熱フィンを熱伝導性樹脂を介して制御駆動の出力素子に接触させることにより、鉄製ブラケットに比べ放熱性が増し、送風ファンの自冷による風も直接放熱フィンに吹きつけるため、冷却効果が更に増すことが可能である。   According to the heat dissipation structure of the control drive output element of the brushless motor of the present invention, the heat dissipating fin having an excellent external heat conductivity is brought into contact with the control drive output element via the heat conductive resin, so that Compared with the bracket, the heat radiation performance is increased, and the wind generated by the self-cooling of the blower fan is directly blown to the heat radiation fins, so that the cooling effect can be further increased.

また、制御駆動の出力素子の放熱部を従来の鉄板製のブラケットのみの構成から、制御駆動の出力素子の発熱をダイキャスト製によるアルミニウム製の放熱フィンによる放熱構造とすることで、放熱部のフィン形状の自由度が増し、軸に取り付けたファンの送風に適したフィン形状の対応が可能となり、気流の流れを配慮した放熱フィンを選択可能で、放熱フィンの構成について最適化が可能である。   In addition, the heat-radiating part of the control-driven output element is made up of a conventional steel plate bracket only, and the heat-radiating structure of the heat-driving element of the control-driven output element is made by die-cast aluminum heat-dissipating fins. The degree of freedom of the fin shape is increased, the fin shape suitable for blowing air from the fan attached to the shaft can be handled, the radiation fin considering the flow of the air flow can be selected, and the configuration of the radiation fin can be optimized .

以下、本発明の実施の形態について図面を用いて詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

つぎに、本発明のファン駆動用のブラシレスモータにおける制御駆動の出力素子（パワースイッチング素子）の放熱構造の具体的な実施例について、図を参照しながら説明する。   Next, a specific embodiment of the heat dissipation structure of the control drive output element (power switching element) in the fanless brushless motor of the present invention will be described with reference to the drawings.

図１は、本発明のファン駆動用のブラシレスモータの構造断面図である。まず、固定子鉄心１に巻線２が施された固定子鉄心巻線組立部と軸出側の軸受の収納部を有するブラケット３を樹脂４でモールド成型したモールド組立に鉄製の軸５に圧入固定された積層鉄心シートと永久磁石とから構成される回転子鉄心６と回転子の位置検出用の信号を発生させるセンサマグネット７をその両側に同じく軸５に圧入固定された軸受８とで構成される回転子をモールド組立に挿入し、反軸出側より回転位置検出用のセンサ９を備えた回路基板１０を取り付ける。また、軸受３の収納部を有したブラケット１１と熱伝導性の優れた放熱フィン１２とをねじ１３で締結し、制御駆動の出力素子（パワースイッチング素子）１４の表面に熱伝導樹脂１５を塗布し、反軸出力ブラケット１１をモールド組立の反軸出側外側より取り付けて構成しているブラシレスモータである。   FIG. 1 is a structural sectional view of a brushless motor for driving a fan according to the present invention. First, a stator core winding assembly part in which a stator core 1 is wound with a winding 2 and a bracket 3 having a bearing housing part on the axial side are press-fitted into an iron shaft 5 into a mold assembly molded with resin 4 A rotor core 6 composed of a fixed laminated core sheet and a permanent magnet, and a sensor magnet 7 for generating a signal for detecting the position of the rotor are composed of bearings 8 that are also press-fitted and fixed to the shaft 5 on both sides. The rotor to be mounted is inserted into the mold assembly, and the circuit board 10 provided with the sensor 9 for detecting the rotational position is attached from the non-axial side. Further, the bracket 11 having the housing portion of the bearing 3 and the heat dissipating fin 12 having excellent heat conductivity are fastened with screws 13, and the heat conductive resin 15 is applied to the surface of the control drive output element (power switching element) 14. The anti-shaft output bracket 11 is attached to the outer side of the mold assembly on the anti-axis output side.

放熱フィン１２の突起部１７と、ブラケット１１の孔部１６について説明する。ブラシレスモータを駆動する回路基板が取り付け収納されたモールド組立に、反軸出側外側から反軸出側の軸受８の収納部を形成するブラケット１１を取り付け、そのブラケット１１に孔部１６を設けることで外部よりこの孔部１６に挿入可能な突起部を含むブラケット１１の材質よりも熱伝導性の優れた材質の放熱フィン１２をブラケット１１に固定し、放熱フィン１２の突起部１７が熱伝導樹脂を介してブラシレスモータの駆動素子である制御駆動の出力素子（パワースイッチング素子）１４に接する構成を備え、制御駆動の出力素子（パワースイッチング素子）１４の発熱を放熱フィン１２の熱放散部に伝達し、この熱放散部を介してブラシレスモータ外部に放熱させ、ブラシレスモータの出力軸の軸５の負荷側で発生させる送風効果で生じる気流の流れが放熱フィン１２の熱放散部近傍を通過することで冷却効果を高める構成である。   The protrusion 17 of the radiation fin 12 and the hole 16 of the bracket 11 will be described. A bracket 11 that forms a housing portion for the bearing 8 on the non-axis-exit side is attached to the mold assembly in which a circuit board for driving the brushless motor is mounted and stored, and a hole 16 is provided in the bracket 11. The heat dissipating fin 12 made of a material having better thermal conductivity than the material of the bracket 11 including the protrusion that can be inserted into the hole 16 from the outside is fixed to the bracket 11, and the protrusion 17 of the heat dissipating fin 12 is the heat conducting resin. Is connected to a control drive output element (power switching element) 14 that is a drive element of the brushless motor, and the heat generated by the control drive output element (power switching element) 14 is transmitted to the heat dissipating portion of the radiation fin 12. Then, the air blowing effect generated on the load side of the shaft 5 of the output shaft of the brushless motor by radiating heat to the outside of the brushless motor through the heat dissipation portion Is configured to enhance the cooling effect by the flow of the resulting gas stream passes through the heat dissipation portion near the radiation fin 12.

軸に負荷が加わり、ブラシレスモータの巻線に電流が流れると、制御駆動の出力素子（パワースイッチング素子）１４で消費される電力により制御駆動の出力素子（パワースイッチング素子）１４自体が発熱する。本発明の放熱構造を採用することで、制御駆動の出力素子（パワースイッチング素子）１４からの熱が熱伝導樹脂１５に伝わり、熱伝導樹脂１５に接している熱伝導性の優れた材質である放熱フィン１２に伝わる。放熱フィン１２はブラシレスモータ外郭を構成しているため、熱源である制御駆動の出力素子（パワースイッチング素子）１４より発生した熱は最終的に外気中に発せられるため、従来構造に比べ放熱効果が増し、より高い負荷に対しても加熱保護装置が働くことはなくなるためブラシレスモータの機能を損ねることはなくなる。   When a load is applied to the shaft and a current flows through the winding of the brushless motor, the control drive output element (power switching element) 14 itself generates heat by the power consumed by the control drive output element (power switching element) 14. By adopting the heat dissipating structure of the present invention, the heat from the control drive output element (power switching element) 14 is transmitted to the heat conducting resin 15 and is a material having excellent heat conductivity in contact with the heat conducting resin 15. It is transmitted to the radiating fin 12. Since the heat dissipating fins 12 form a brushless motor outline, the heat generated from the control-driven output element (power switching element) 14 that is a heat source is finally emitted into the outside air, so that the heat dissipating effect is greater than that of the conventional structure. In addition, the function of the brushless motor is not impaired because the heat protection device does not work even with a higher load.

表１に本発明の構成の放熱フィン１２を取り付けたブラシレスモータの構造と従来のブラシレスモータの構造の空気調和機に搭載して、運転を行った時の温度上昇値を示す。温度上昇を観測している箇所は、制御駆動の出力素子（パワースイッチング素子）１４に加え、制御駆動の出力素子（パワースイッチング素子）の回路基板取り付け半田部、巻線２、軸受８である。この結果から提案する放熱構造により、従来構造に比べ、制御駆動の出力素子（パワースイッチング素子）１４の温度だけでなく、ブラシレスモータ全体としても温度が下がっていることが確認できる。なお、放熱フィン１２の材質は、アルミニウムに限らずアルミニウム合金や、マグネシウム合金など放熱フィンに好適なものを適宜選択することが可能である   Table 1 shows the temperature rise value when the brushless motor structure having the structure of the present invention and the conventional brushless motor structure are mounted on the air conditioner and operated. In addition to the control drive output element (power switching element) 14, locations where the temperature rise is observed are the circuit board mounting solder part, the winding 2, and the bearing 8 of the control drive output element (power switching element). From this result, it can be confirmed that the proposed heat dissipation structure lowers not only the temperature of the control drive output element (power switching element) 14 but also the temperature of the brushless motor as a whole. The material of the radiating fin 12 is not limited to aluminum, and an appropriate material for the radiating fin such as an aluminum alloy or a magnesium alloy can be selected as appropriate.

Figure 0005186899
Figure 0005186899

また、図４に本発明のブラシレスモータの軸に取り付けたファンによる風の流れを示す。ファンが回転することで、風はブラシレスモータの反軸出側より軸出側に向かって流れるため、ブラシレスモータの反軸出側に当たった風は放射状に分散される。放熱フィン１２の形状を図５に示すように風の流れと同じ放射状にすることにより、風の流れによる放熱効果が高まる。軸５の軸線上の位置を中心として放熱フィンの凸凹形状を放射状に配置した構成である。   FIG. 4 shows the flow of wind by the fan attached to the shaft of the brushless motor of the present invention. As the fan rotates, the wind flows from the anti-axial side of the brushless motor toward the axial side, so that the wind that hits the anti-axial side of the brushless motor is dispersed radially. By making the shape of the radiation fins 12 the same radial shape as the wind flow as shown in FIG. 5, the heat radiation effect by the wind flow is enhanced. This is a configuration in which the uneven shape of the radiating fins is radially arranged around the position on the axis of the shaft 5.

本発明は、例えば空気調和機の送風用途として用いられるファン駆動用のブラシレスモータに有用である。   The present invention is useful, for example, for a brushless motor for driving a fan used as a fan for an air conditioner.

本発明のブラシレスモータの構造断面図Cross-sectional view of the brushless motor of the present invention 従来のブラシレスモータの構造断面図Cross-sectional view of the structure of a conventional brushless motor （ａ）本発明の反出力軸側からの放熱構造分解斜視図（ｂ）本発明の出力軸側からの放熱構造分解斜視図(A) Heat dissipation structure exploded perspective view from the non-output shaft side of the present invention (b) Heat dissipation structure exploded perspective view from the output shaft side of the present invention 気流の方向を示す斜視図Perspective view showing the direction of airflow 本発明の実施例２を示す斜視図The perspective view which shows Example 2 of this invention

符号の説明Explanation of symbols

１ 固定子鉄心
２ 巻線
３ 軸出側ブラケット
４ 樹脂
５ 軸
６ 回転子鉄心
７ センサマグネット
８ 軸受
９ センサ
１０ 回路基板
１１ 反軸出側ブラケット
１２ 放熱フィン
１３ ねじ
１４ 制御駆動の出力素子（パワースイッチング素子）
１５ 熱伝導樹脂
１６ 孔部
１７ 放熱フィンの突起部 DESCRIPTION OF SYMBOLS 1 Stator iron core 2 Winding 3 Axial bracket 4 Resin 5 Axis 6 Rotor iron core 7 Sensor magnet 8 Bearing 9 Sensor 10 Circuit board 11 Non-axis advancing bracket 12 Radiation fin 13 Screw 14 Control drive output element (power switching element)
15 Thermal Conductive Resin 16 Hole 17 Projection of Radiation Fin

Claims (4)

固定子鉄心と巻線とを有する固定子鉄心巻線組立部と、一方の軸受けを樹脂でモールドしたモールド組立に、前記固定子鉄心の内周面とギャップを介して回転自在に回転する回転子を挿入し、他方の軸受を保持するブラケットを前記モールド組立に取り付けたブラシレスモータであって、
前記モールド組立と前記ブラケットの間に回路基板を設け、
前記ブラケットには前記回路基板の出力素子と対向する位置に孔部を設け、
前記孔部に挿入可能な突起部を備えた放熱フィンを前記ブラケットに固定し、
前記放熱フィンは前記ブラケットの材質よりも熱伝導性の優れた材質からなり、前記突起部は熱伝導樹脂を介して前記出力素子に接することを特徴とするブラシレスモータ。 A stator core winding assembly having a stator core and a winding, and a rotor that rotates in a mold assembly in which one bearing is molded with resin through a gap between the inner peripheral surface of the stator core and a gap. A brushless motor in which a bracket for holding the other bearing is attached to the mold assembly ,
A circuit board is provided between the mold assembly and the bracket,
The bracket is provided with a hole at a position facing the output element of the circuit board ,
Fixing a heat dissipating fin with a protrusion that can be inserted into the hole to the bracket;
The heat dissipating fin is made of a material having a higher thermal conductivity than the material of the bracket, and the protrusion is in contact with the output element through a heat conductive resin. 前記放熱フィンの材質をアルミニウムとしたことを特徴とする請求項１記載のブラシレスモータ。 The brushless motor according to claim 1, wherein the heat dissipating fin is made of aluminum. 前記熱伝導樹脂の材質をシリコン樹脂としたことを特徴とする請求項１記載のブラシレスモータ。 2. The brushless motor according to claim 1, wherein the heat conductive resin is made of silicon resin. 請求項１から請求項３のいずれかに記載のブラシレスモータを具備する空気調和機。 An air conditioner comprising the brushless motor according to any one of claims 1 to 3 .
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