JP2019033614A - Motor and air blower - Google Patents

Motor and air blower Download PDF

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JP2019033614A
JP2019033614A JP2017154036A JP2017154036A JP2019033614A JP 2019033614 A JP2019033614 A JP 2019033614A JP 2017154036 A JP2017154036 A JP 2017154036A JP 2017154036 A JP2017154036 A JP 2017154036A JP 2019033614 A JP2019033614 A JP 2019033614A
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hole
top surface
motor
axial direction
central axis
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JP7009825B2 (en
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厚志 東谷
Atsushi Higashiya
厚志 東谷
良太 林田
Ryota Hayashida
良太 林田
章基 山▲崎▼
Akimoto Yamazaki
章基 山▲崎▼
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Nidec Corp
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Nidec Corp
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Abstract

To provide a motor having a structure which can cool an inside of the motor efficiently, and an air blower comprising the motor.SOLUTION: A motor 2 has a rotation portion 3 having a magnet 34 and rotating around a vertically extended central axis J, and a stationary portion 4 having a stator 41 and rotatably supporting the rotation portion 3. The rotation portion 3 has a shaft 33 extending in an axial direction around the central axis J, a top surface portion 31 extending in a radial direction from the shaft 33, and a cylindrical cylinder portion 32 extending in the axial direction from the top surface portion 31. The top surface portion 31 has at least one through hole 310 penetrating in the axial direction, a top marginal portion 311 of a top face of the top surface portion 31 forming the through hole 310, and a bottom marginal portion 312 of a bottom face of the top surface portion 31 forming the through hole 310. The top surface portion 31 further has a first inclined surface 313 inclining in a direction apart from the central axis J from the top marginal portion 311 of the through hole 310 toward the bottom marginal portion 312 inside in the radial direction of the through hole 310.SELECTED DRAWING: Figure 1

Description

本発明はモータおよび送風機に関する。   The present invention relates to a motor and a blower.

電機子を有するモータでは、電機子の巻線に流れる電流の大きさに比例して、巻線が発
熱する。そのため、従来、ロータの回転に伴って電機子の周辺に空気を流すモータやファンモータが知られている。 In a motor having an armature, the winding generates heat in proportion to the amount of current flowing through the winding of the armature. Therefore, conventionally, a motor and a fan motor that flow air around the armature as the rotor rotates are known.

特開２０１２−２４６８０６号公報では、ロータヨークの底面部に、ステータ側のコイルを含むロータヨークの内側を冷却するための通気孔を複数開設している。   In Japanese Patent Application Laid-Open No. 2012-246806, a plurality of air holes are provided in the bottom surface of the rotor yoke for cooling the inside of the rotor yoke including the stator side coil.

特開２０１２−２４６８０６号公報JP 2012-246806 A

しかしながら、特開２０１２−２４６８０６号公報に記載の軸流ファンは、ロータヨークの上方から底面部に向かって流れる空気が効率よく通気孔から内側に入らない。そのため、例えば出力の高いモータを有する軸流ファンにおいて、冷却効果を高めることが困難である。   However, in the axial fan described in Japanese Patent Application Laid-Open No. 2012-246806, the air flowing from the upper side of the rotor yoke toward the bottom surface does not enter the inner side through the vent hole efficiently. Therefore, for example, in an axial fan having a high output motor, it is difficult to enhance the cooling effect.

本発明の一つの態様は、効率よくモータ内部を冷却することができる構造を有するモータ、およびそのようなモータを備える送風機を提供することを目的の一つとする。   One aspect of the present invention is to provide a motor having a structure capable of efficiently cooling the inside of the motor and a blower including such a motor.

本発明の例示的な一実施形態のモータは、マグネットを有し、上下に延びる中心軸を中心として回転する回転部と、ステータを有し、前記回転部を回転可能に支持する静止部と、を有し、前記回転部は、前記中心軸を中心に軸方向に延びるシャフトと、前記シャフトから径方向に延びる天面部と、前記天面部から軸方向に延びる筒状の筒部と、を有し、前記天面部は、軸方向に貫通する少なくとも一つの貫通孔と、前記貫通孔を形成する前記天面部の上面の上縁部と、前記貫通孔を形成する前記天面部の下面の下縁部と、を有し、前記天面部が、前記貫通孔の径方向内側において、前記貫通孔の前記上縁部から前記下縁部に向かって前記中心軸から離れる方向に傾斜する第１傾斜面をさらに有する。   A motor according to an exemplary embodiment of the present invention includes a rotating part that includes a magnet and rotates about a central axis that extends vertically, a stationary part that includes a stator and rotatably supports the rotating part, The rotating portion includes a shaft extending in the axial direction around the central axis, a top surface portion extending in the radial direction from the shaft, and a cylindrical tube portion extending in the axial direction from the top surface portion. The top surface portion includes at least one through-hole penetrating in the axial direction, an upper edge portion of the top surface of the top surface portion that forms the through-hole, and a lower edge of the bottom surface of the top surface portion that forms the through-hole. A first inclined surface that is inclined in a direction away from the central axis from the upper edge portion of the through hole toward the lower edge portion on the radially inner side of the through hole. It has further.

本発明の一つの態様によれば、天面部付近の空気を効率よくモータ内部に流し、モータ内部を冷却する構造を有するモータ、およびそのようなモータを備える送風機が提供される。   According to one aspect of the present invention, a motor having a structure in which air near the top surface portion efficiently flows inside the motor and cools the inside of the motor, and a blower including such a motor are provided.

図１は、本発明の例示的な一実施形態に係るモータを有する送風機の縦断面図である。FIG. 1 is a longitudinal sectional view of a blower having a motor according to an exemplary embodiment of the present invention. 図２は、本発明の例示的な一実施形態に係るモータの天面部の部分拡大図面である。FIG. 2 is a partially enlarged view of a top surface portion of a motor according to an exemplary embodiment of the present invention. 図３は、従来のモータの天面部付近の空気の流速ベクトルを示した解析データである。FIG. 3 is analysis data showing a flow velocity vector of air near the top surface of a conventional motor. 図４は、本発明の例示的な一実施形態に係るモータの回転部の上面図である。FIG. 4 is a top view of a rotating part of a motor according to an exemplary embodiment of the present invention. 図５は、本発明の例示的な一実施形態の変形例に係るモータの回転部の上面図である。FIG. 5 is a top view of a rotating part of a motor according to a modification of the exemplary embodiment of the present invention.

以下、本発明の例示的な実施形態について、図面を参照しながら詳細に説明する。なお、本明細書では、モータ２の回転部３が回転する際の中心軸Ｊが延びる方向を「軸方向」とする。また、モータ２の中心軸Ｊに直交する方向を「径方向」、モータ２の中心軸Ｊを中心とする円弧に沿う方向を「周方向」とそれぞれ称する。また、本明細書では、軸方向を上下方向とし、軸方向においてコイル４４から天面部３１に向かう方向を上として、各部の形状や位置関係を説明する。ただし、この上下方向の定義により、本発明に係るモータ２の使用時の向きを限定する意図はない。   Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. In this specification, the direction in which the central axis J extends when the rotating unit 3 of the motor 2 rotates is referred to as an “axial direction”. A direction perpendicular to the central axis J of the motor 2 is referred to as a “radial direction”, and a direction along an arc centered on the central axis J of the motor 2 is referred to as a “circumferential direction”. Further, in this specification, the shape and positional relationship of each part will be described with the axial direction as the vertical direction and the direction from the coil 44 toward the top surface part 31 in the axial direction as the upward direction. However, there is no intention to limit the direction when the motor 2 according to the present invention is used by the definition of the vertical direction.

図１は、本発明の一実施形態に係るモータ２を有する送風機１の構成を示す概略断面図である。図１に示すように、送風機１はモータ２と、モータ２を収容するケーシング２０と、を有する。モータ２は、回転部３と、静止部４と、を有する。ケーシング２０の中央部には、軸方向に貫通するケーシング孔部２０ａが設けられる。ケーシング２０は、ケーシング孔部２０ａの下部側にベース部２１を有する。ベース部２１は静止部４を支持する。   FIG. 1 is a schematic cross-sectional view showing a configuration of a blower 1 having a motor 2 according to an embodiment of the present invention. As shown in FIG. 1, the blower 1 includes a motor 2 and a casing 20 that houses the motor 2. The motor 2 has a rotating part 3 and a stationary part 4. A casing hole 20 a penetrating in the axial direction is provided at the center of the casing 20. The casing 20 has a base portion 21 on the lower side of the casing hole portion 20a. The base part 21 supports the stationary part 4.

回転部３は、天面部３１と、筒部３２と、シャフト３３と、マグネット３４と、ハウジング部３５と、を有する。回転部３は、マグネット３１を有し、上下に延びる中心軸Ｊを中心として回転する。   The rotating portion 3 includes a top surface portion 31, a cylindrical portion 32, a shaft 33, a magnet 34, and a housing portion 35. The rotating unit 3 includes a magnet 31 and rotates around a central axis J that extends vertically.

シャフト３３は、中心軸Ｊを中心に軸方向に延びる。シャフト３３は円柱状の金属部材である。ただし、シャフト３３は円筒状等の他の形状であってもよい。   The shaft 33 extends in the axial direction about the central axis J. The shaft 33 is a cylindrical metal member. However, the shaft 33 may have another shape such as a cylindrical shape.

天面部３１は、シャフト３３から径方向に延びる。天面部３１は、軸方向に貫通する少なくとも一つの貫通孔３１０と、上縁部３１１と、下縁部３１２と、を有する。上縁部３１１は、貫通孔３１０を形成する天面部３１の上面の縁である。下縁部３１２は、貫通孔３１０を形成する天面部３１の下面の縁である。本実施形態において、天面部３１は複数の貫通孔３１０を有する。   The top surface portion 31 extends from the shaft 33 in the radial direction. The top surface portion 31 includes at least one through-hole 310 that penetrates in the axial direction, an upper edge portion 311, and a lower edge portion 312. The upper edge portion 311 is an edge of the upper surface of the top surface portion 31 that forms the through hole 310. The lower edge portion 312 is an edge of the lower surface of the top surface portion 31 that forms the through hole 310. In the present embodiment, the top surface portion 31 has a plurality of through holes 310.

筒部３２は、天面部３１から軸方向に延びる筒状の部材である。本実施形態において、筒部３２の径方向内側には後述するロータホルダ３６が配置される。ただし、筒部３２とロータホルダ３６とは単一の部材であってもよい。ロータホルダ３６は、下側に開口するカップ形状である。ロータホルダ３６は、筒部３２および天面部３１の内側に配置されて、マグネット３４を保持する。ロータホルダ３６は、例えば炭素鋼等の磁性材で構成される。   The cylindrical portion 32 is a cylindrical member that extends in the axial direction from the top surface portion 31. In the present embodiment, a rotor holder 36 to be described later is disposed on the radially inner side of the cylindrical portion 32. However, the cylindrical portion 32 and the rotor holder 36 may be a single member. The rotor holder 36 has a cup shape that opens downward. The rotor holder 36 is disposed inside the cylinder portion 32 and the top surface portion 31 and holds the magnet 34. The rotor holder 36 is made of a magnetic material such as carbon steel.

マグネット３４は、ロータホルダ３６の内周面に配置される。本実施形態では、マグネット３４は単一の環状マグネットである。マグネット３４の径方向内側の面には、Ｎ極とＳ極とが周方向に交互に着磁される。単一の環状マグネットに替えて、複数のマグネット３４がロータホルダ３６の内周面に配置されてよい。この場合、複数のマグネット３４は周方向に等間隔に配置される。複数のマグネット３４は、Ｎ極の磁極面とＳ極の磁極面とが周方向に交互に配置される。ロータホルダ３６とマグネット３４とが磁性体粉を配合した樹脂によって、単一の部材として構成されてもよい。   The magnet 34 is disposed on the inner peripheral surface of the rotor holder 36. In the present embodiment, the magnet 34 is a single annular magnet. N poles and S poles are alternately magnetized in the circumferential direction on the radially inner surface of the magnet 34. Instead of a single annular magnet, a plurality of magnets 34 may be arranged on the inner peripheral surface of the rotor holder 36. In this case, the plurality of magnets 34 are arranged at equal intervals in the circumferential direction. The plurality of magnets 34 have N-pole magnetic pole surfaces and S-pole magnetic pole surfaces arranged alternately in the circumferential direction. The rotor holder 36 and the magnet 34 may be configured as a single member by a resin containing magnetic powder.

ハウジング部３５は、シャフト３３を支持する。ハウジング部３５は、中央部に軸方向に延びるハウジング孔部３５ａを有する。ハウジング孔部３５ａには、シャフト３３が挿入される。ハウジング部３５は、シャフト３３の上部に位置する。シャフト３３の上部は、ハウジング孔部３５ａに固定される。ハウジング部３５は、例えば金属で構成される。   The housing part 35 supports the shaft 33. The housing part 35 has a housing hole part 35a extending in the axial direction at the center part. The shaft 33 is inserted into the housing hole 35a. The housing part 35 is located in the upper part of the shaft 33. The upper part of the shaft 33 is fixed to the housing hole 35a. The housing part 35 is made of metal, for example.

本実施形態において、回転部３の筒部３２は径方向外側において周方向に複数の羽根３７を有する。複数の羽根３７は、回転部３と共に中心軸Ｊを中心として回転する。これにより、ケーシング孔部２０ａ内に気流が発生する。本実施形態において、モータ２を有する送風機１は、軸方向上側から下側に向かう気流が発生する軸流式の送風機である。つまり、ケーシング孔部２０ａを通る気流によって、天面部３１付近の空気も軸方向上側から軸方向下側に向かう。このため、後述する貫通孔３１０をより多くの空気が通り、より大きい冷却効果を得ることができる。   In the present embodiment, the cylindrical portion 32 of the rotating portion 3 has a plurality of blades 37 in the circumferential direction on the radially outer side. The plurality of blades 37 rotate around the central axis J together with the rotating unit 3. Thereby, an air flow is generated in the casing hole 20a. In the present embodiment, the blower 1 having the motor 2 is an axial flow type blower that generates an airflow from the upper side to the lower side in the axial direction. That is, the air near the top surface 31 also moves from the upper side in the axial direction to the lower side in the axial direction by the airflow passing through the casing hole 20a. For this reason, more air passes through the through-hole 310 mentioned later, and the bigger cooling effect can be acquired.

静止部４はステータ４１を有する。ステータ４１はステータコア４２を有する。ステータコア４２は、例えば、電磁鋼板が軸方向に積層された積層鋼板で構成される。ステータコア４２は、環状のコアバック４２ａと、コアバック４２ａから径方向外側に延びる複数のティース４２ｂとを有する。各ティース４２ｂにインシュレータ４３を介して導線が巻かれることによって、コイル４４が構成される。すなわち、ステータ４１は複数のコイル４４を有する。コイル４４から引き出された導線の一端は、ステータ４１の下部に配置される回路基板４５と電気的に接続される。回路基板４５には、外部から電力が供給される。   The stationary part 4 has a stator 41. The stator 41 has a stator core 42. The stator core 42 is composed of a laminated steel plate in which electromagnetic steel plates are laminated in the axial direction, for example. The stator core 42 includes an annular core back 42a and a plurality of teeth 42b extending radially outward from the core back 42a. A coil 44 is configured by winding a conductive wire around each tooth 42 b via an insulator 43. That is, the stator 41 has a plurality of coils 44. One end of the conducting wire drawn out from the coil 44 is electrically connected to a circuit board 45 disposed under the stator 41. Electric power is supplied to the circuit board 45 from the outside.

静止部４は軸受ホルダ４６を有する。軸受ホルダ４６は、ステータ４１の径方向内側に配置される。軸受ホルダ４６は軸方向に延び、ステータ４１に固定される。軸受ホルダ４６は、径方向内側に軸受５を有する。軸受５は、上部と下部に２つ配置される。上下２つの軸受５は、静止部４に対して回転部３を回転可能に支持する。軸受５は、シャフト３３の外周に固定される。本実施形態では、軸受５はボールベアリングである。   The stationary part 4 has a bearing holder 46. The bearing holder 46 is disposed inside the stator 41 in the radial direction. The bearing holder 46 extends in the axial direction and is fixed to the stator 41. The bearing holder 46 has the bearing 5 on the radially inner side. Two bearings 5 are arranged in the upper part and the lower part. The upper and lower bearings 5 support the rotating unit 3 so as to be rotatable with respect to the stationary unit 4. The bearing 5 is fixed to the outer periphery of the shaft 33. In the present embodiment, the bearing 5 is a ball bearing.

上記構成のモータ２において、コイル４４に電力が供給されると、ティース４２ｂに磁束が生じる。そして、ティース４２ｂとマグネット３４との間の磁束の作用により周方向のトルクが発生する。これにより、回転部３が静止部４に対して中心軸Ｊを中心として回転し、モータ２の回転動作が開始される。回転部３の回転には羽根３７の回転も含まれ、気流が生じる。コイル４４への電力の供給が停止されると、回転部３の回転が停止する。これにより、モータ２の回転動作が終了する。   In the motor 2 configured as described above, when electric power is supplied to the coil 44, magnetic flux is generated in the teeth 42b. A circumferential torque is generated by the action of magnetic flux between the teeth 42b and the magnet 34. As a result, the rotating unit 3 rotates about the central axis J with respect to the stationary unit 4, and the rotation operation of the motor 2 is started. The rotation of the rotating unit 3 includes the rotation of the blades 37, and an air flow is generated. When the supply of power to the coil 44 is stopped, the rotation of the rotating unit 3 is stopped. Thereby, the rotation operation of the motor 2 is completed.

図２は、本発明の例示的な一実施形態に係るモータ２の天面部３１の部分拡大図面である。図３は、従来のモータ２の天面部３１付近の空気の流速ベクトルを示した図である。天面部３１付近の空気は、天面部３１に当たった後、モータ２の回転による遠心力によって、径方向外側に向かって流れる。図２に示すように、貫通孔３１０の径方向内側において、天面部３１は、貫通孔３１０の上縁部３１１から下縁部３１２に向かって中心軸Ｊから離れる方向に傾斜する第１傾斜面３１３を有する。このため、天面部３１付近の空気が、径方向外側に向かって流れるとき、第１傾斜面３１３に沿って軸方向下側に向きを変えてモータ２内部に流れ込む。これにより、効率よくモータ２内部を冷却することができる。また、天面部３１から窪んで第１傾斜面３１３が形成されるため、モータ２外部に部品を配置しやすい。つまり、天面部３１の軸方向厚みの中に、第１傾斜面３１３が配置される。なお、第１傾斜面３１３は、天面部３１の下面よりも軸方向下側まで延びて配置されてもよい。   FIG. 2 is a partially enlarged view of the top surface portion 31 of the motor 2 according to an exemplary embodiment of the present invention. FIG. 3 is a diagram showing a flow velocity vector of air in the vicinity of the top surface portion 31 of the conventional motor 2. After the air near the top surface portion 31 hits the top surface portion 31, the air flows radially outward due to the centrifugal force generated by the rotation of the motor 2. As shown in FIG. 2, on the radially inner side of the through hole 310, the top surface portion 31 is inclined first in the direction away from the central axis J from the upper edge portion 311 to the lower edge portion 312 of the through hole 310. 313. For this reason, when the air in the vicinity of the top surface portion 31 flows toward the outside in the radial direction, the air changes into the axially lower side along the first inclined surface 313 and flows into the motor 2. Thereby, the inside of the motor 2 can be efficiently cooled. Further, since the first inclined surface 313 is formed so as to be recessed from the top surface portion 31, it is easy to arrange components outside the motor 2. That is, the first inclined surface 313 is arranged in the axial thickness of the top surface portion 31. The first inclined surface 313 may be disposed so as to extend to the lower side in the axial direction than the lower surface of the top surface portion 31.

本実施形態において、天面部３１は、貫通孔３１０の径方向外側において、上縁部３１１から下縁部３１２に向かって中心軸Ｊに離れる方向に傾斜する第２傾斜面３１４を有する。第１傾斜面３１３に沿って流れる空気の一部は、径方向外側に位置する上縁部３１１から、さらに径方向外側へ流れ出る可能性がある。第２傾斜面３１４を設けることによって、流れる空気が径方向外側に位置する上縁部３１１よりも、さらに径方向外側に流れ出ることを抑制できる。このため、より効率よく空気をモータ２内部に流すことができる。   In the present embodiment, the top surface portion 31 has a second inclined surface 314 that is inclined in a direction away from the central axis J from the upper edge portion 311 toward the lower edge portion 312 on the radially outer side of the through hole 310. A part of the air flowing along the first inclined surface 313 may flow further outward in the radial direction from the upper edge portion 311 located on the outer side in the radial direction. By providing the second inclined surface 314, it is possible to suppress the flowing air from flowing further outward in the radial direction than the upper edge portion 311 positioned on the outer side in the radial direction. For this reason, air can be flowed into the motor 2 more efficiently.

本実施形態において、上縁部３１１を通り中心軸Ｊに平行な面と第１傾斜面３１３とのなす角θ１は、上縁部３１１を通り中心軸Ｊに平行な面と第２傾斜面３１４とのなす度θ２よりも大きい。第１傾斜面３１３により、径方向に流れる気流の向きを、軸方向下側に向ける。そのため、傾斜角度θ１は傾斜角度θ２よりもなだらかであることが好ましい。第２傾斜面３１４により、向きを変えた気流が軸方向上側に流れ出ることを抑制する。そのため、傾斜角度θ２は傾斜角度θ１よりも小さいことが好ましい。 In the present embodiment, the angle θ1 formed between the surface passing through the upper edge 311 and parallel to the central axis J and the first inclined surface 313 is the surface passing through the upper edge 311 and parallel to the central axis J and the second inclined surface 314. Is greater than θ2. The first inclined surface 313 directs the direction of the airflow flowing in the radial direction downward in the axial direction. Therefore, it is preferable that the inclination angle θ1 is gentler than the inclination angle θ2. The second inclined surface 314 prevents the airflow whose direction has been changed from flowing upward in the axial direction. Therefore, the inclination angle θ2 is preferably smaller than the inclination angle θ1.

本実施形態において、第１傾斜面３１３の径方向外側端部は、第２傾斜面３１４の径方向内側端部と径方向に同じ位置または径方向内側 に位置する。こうすれば、金型を用いて天面部３１を成形する際、金型を軸方向に抜くことができる。従って、天面部３１に貫通孔３１０を容易に作成することができる。 In the present embodiment, the radially outer end of the first inclined surface 313 is located at the same position or radially inward in the radial direction as the radially inner end of the second inclined surface 314. If it carries out like this, when shape | molding the top | upper surface part 31 using a metal mold | die, a metal mold | die can be extracted in an axial direction. Therefore, the through hole 310 can be easily created in the top surface portion 31.

図４は、回転部３を上方から見た上面図である。本実施形態において、貫通孔３１０は、平面視において、径方向に垂直な方向に長辺を有する長方形状である。このため、第１傾斜面３１３および第２傾斜面３１４を貫通孔３１０の長辺に沿って形成できる。すなわち、第１傾斜面３１３および第２傾斜面３１４の径方向に垂直な方向の長さを大きくできる。天面部３１の上面において、モータ２の回転による遠心力によって径方向に流れる空気は、径方向に垂直な方向に大きく開口した貫通孔３１０の内部に流入しやすくなる。天面部３１付近の空気を第１傾斜面３１３および第２傾斜面３１４に沿って効率よく貫通孔３１０から流し込むことができ、モータ２内部の冷却効果が向上する。ただし、貫通孔３１０は平面視において、例えば、円形、三角形、正方形等であってもよい。 FIG. 4 is a top view of the rotating unit 3 as viewed from above. In the present embodiment, the through hole 310 has a rectangular shape having a long side in a direction perpendicular to the radial direction in plan view. For this reason, the first inclined surface 313 and the second inclined surface 314 can be formed along the long side of the through hole 310. That is, the length in the direction perpendicular to the radial direction of the first inclined surface 313 and the second inclined surface 314 can be increased. On the upper surface of the top surface portion 31, the air flowing in the radial direction due to the centrifugal force generated by the rotation of the motor 2 easily flows into the through-hole 310 that is greatly opened in the direction perpendicular to the radial direction. Air in the vicinity of the top surface portion 31 can be efficiently poured from the through hole 310 along the first inclined surface 313 and the second inclined surface 314, and the cooling effect inside the motor 2 is improved. However, the through hole 310 may be, for example, a circle, a triangle, a square, or the like in plan view.

本実施形態において、ロータホルダ３６は、板部３６１と、少なくとも一つのホルダ孔３６２とを有する。板部３６１は、天面部３１の軸方向下側に配置される。板部３６１には、板部３６１を軸方向に貫通するホルダ孔３６２が設けられる。貫通孔３１０の少なくとも一部は、軸方向から見てホルダ孔３６２と重なる位置に配置される。空気は軸方向上側から軸方向下側に向かって、貫通孔３１０とホルダ孔３６２を通ってモータ内部に流れる。これにより、ロータホルダ３６の内部が冷却され、よりモータ２の冷却効果が得られる。 In the present embodiment, the rotor holder 36 includes a plate portion 361 and at least one holder hole 362. The plate portion 361 is disposed on the lower side in the axial direction of the top surface portion 31. The plate portion 361 is provided with a holder hole 362 that penetrates the plate portion 361 in the axial direction. At least a part of the through hole 310 is arranged at a position overlapping the holder hole 362 when viewed from the axial direction. Air flows into the motor through the through hole 310 and the holder hole 362 from the upper side in the axial direction toward the lower side in the axial direction. Thereby, the inside of the rotor holder 36 is cooled, and the cooling effect of the motor 2 is further obtained.

本実施形態において、貫通孔３１０は、ホルダ孔３６２よりも開口面積の大きい第１貫通孔３１０１を含む。回転部３とを組み合わせる際に貫通孔３１０とホルダ孔３６２の周方向の位置がずれる可能性がある。その場合、軸方向から見て貫通孔３１０とホルダ孔３６２の両方とが重なる部分の面積が小さくなり、貫通孔３１０とホルダ孔３６２の両方を通る空気が少なくなる。しかしながら、貫通孔３１０の開口面積がホルダ孔３６２の開口面積よりも大きい場合、貫通孔３１０とホルダ孔３６２の周方向の位置がずれても、ホルダ孔３６２の大きさ分の開口面積を使って空気が取り込まれるため、冷却効果が低下することを抑制できる。 In the present embodiment, the through hole 310 includes a first through hole 3101 having a larger opening area than the holder hole 362. There is a possibility that the positions of the through hole 310 and the holder hole 362 in the circumferential direction are shifted when the rotating part 3 is combined. In that case, the area of the portion where both the through hole 310 and the holder hole 362 overlap as viewed in the axial direction is reduced, and the air passing through both the through hole 310 and the holder hole 362 is reduced. However, when the opening area of the through hole 310 is larger than the opening area of the holder hole 362, even if the circumferential positions of the through hole 310 and the holder hole 362 are shifted, the opening area corresponding to the size of the holder hole 362 is used. Since air is taken in, it can suppress that a cooling effect falls.

本実施形態において、貫通孔３１０は、ホルダ孔３６２と同等の開口面積を有する第２貫通孔３１０２をさらに含む。すなわち、貫通孔３１０は、ホルダ孔３６２よりも開口面積の大きい第１貫通孔３１０１と、ホルダ孔３６２と同等の開口面積を有する第２貫通孔３１０２とを含む。回転部３を組み立てる場合、まず、ホルダ孔３６２に、ホルダ孔３６２の開口面積と同等の断面積を有するピンを通して固定する。その後、ホルダ孔３６２の上方から、ホルダ孔３６２を通ったピンに貫通孔３１０も通して組み合わせる。このとき、ホルダ孔３６２よりも開口面積の大きい第１貫通孔３１０１にピンを通して組み合わせると、開口面積の違いによって回転部３が動く可能性がある。しかしながら、ホルダ孔３６２と同等の開口面積を有する第２貫通孔３１０２にピンを通して組み合わせることにより、ピンと貫通孔３１０を組み合わせた時に、開口面積の違いによって回転部３が動くことを抑制できる。 In the present embodiment, the through hole 310 further includes a second through hole 3102 having an opening area equivalent to the holder hole 362. That is, the through hole 310 includes a first through hole 3101 having an opening area larger than that of the holder hole 362 and a second through hole 3102 having an opening area equivalent to the holder hole 362. When assembling the rotating unit 3, first, the holder hole 362 is fixed through a pin having a cross-sectional area equivalent to the opening area of the holder hole 362. Thereafter, from above the holder hole 362, the through hole 310 is also combined with the pin that has passed through the holder hole 362. At this time, if a pin is combined with the first through hole 3101 having an opening area larger than that of the holder hole 362, the rotating part 3 may move due to a difference in the opening area. However, by combining a pin with the second through hole 3102 having an opening area equivalent to that of the holder hole 362, when the pin and the through hole 310 are combined, it is possible to suppress movement of the rotating part 3 due to a difference in the opening area.

本実施形態において、貫通孔３１０は、複数の第１貫通孔３１０１と、複数の第２貫通孔３１０２とを有する。第１貫通孔３１０１と第２貫通孔３１０２とは周方向に交互に配置される。ただし、貫通孔３１０は、１つの第１貫通孔３１０１と、１つの第２貫通孔３１０２を有してもよい。 In the present embodiment, the through hole 310 has a plurality of first through holes 3101 and a plurality of second through holes 3102. The first through holes 3101 and the second through holes 3102 are alternately arranged in the circumferential direction. However, the through hole 310 may have one first through hole 3101 and one second through hole 3102.

図５は、変形例を説明するため図である。本変形例では、上述の実施形態と異なり、天面部３１Ａ、筒部３２Ａおよびロータホルダ３６が単一の部材により構成される。図５に示すように、本変形例でも、天面部３１Ａは、貫通孔３１０Ａの径方向内側において、貫通孔３１０Ａの上縁部３１１Ａから下縁部３１２Ａに向かって中心軸Ｊから離れる方向に傾斜する第１傾斜面３１３Ａをさらに有する。ただしこの場合、筒部３２Ａの内周面にマグネット３４Ａが配置される。すなわち、モータ２Ａは筒部３２Ａの径方向外側において周方向に複数の羽根３７が配置されないアウターロータ型のモータである。   FIG. 5 is a diagram for explaining a modification. In this modification, unlike the above-described embodiment, the top surface portion 31A, the cylindrical portion 32A, and the rotor holder 36 are configured by a single member. As shown in FIG. 5, also in this modification, the top surface portion 31A is inclined in the direction away from the central axis J from the upper edge portion 311A of the through hole 310A toward the lower edge portion 312A on the radially inner side of the through hole 310A. The first inclined surface 313A is further provided. However, in this case, the magnet 34A is disposed on the inner peripheral surface of the cylindrical portion 32A. That is, the motor 2A is an outer rotor type motor in which a plurality of blades 37 are not arranged in the circumferential direction outside the cylindrical portion 32A in the radial direction.

本明細書中に開示されている種々の技術的特徴は、その技術的創作の主旨を逸脱しない範囲で種々の変更を加えることが可能である。また、本明細書中に示される複数の実施形態及び変形例は可能な範囲で組み合わせて実施されてよい。   Various technical features disclosed in the present specification can be variously modified without departing from the gist of the technical creation. In addition, a plurality of embodiments and modification examples shown in the present specification may be implemented in combination within a possible range.

本発明はモータや送風機等に利用することができる。   The present invention can be used for motors, blowers and the like.

１・・・送風機
２・・・モータ
３、３Ａ・・・回転部
３１、３１Ａ・・・天面部
３１０、３１０Ａ・・・貫通孔
３１０１・・・第１貫通孔
３１０２・・・第２貫通孔
３１１、３１１Ａ・・・上縁部
３１２、３１２Ａ・・・下縁部
３１３、３１３Ａ・・・第１傾斜面
３１４・・・第２傾斜面
３２、３２Ａ・・・筒部
３３・・・シャフト
３４・・・マグネット
３５・・・ハウジング部
３６・・・ロータホルダ
３７・・・羽根
４・・・静止部
４１・・・ステータ
４２・・・ステータコア
４２ａ・・・コアバック
４２ｂ・・・ティース
４３・・・インシュレータ
４４・・・コイル
４５・・・回路基板
４６・・・軸受ホルダ
５・・・軸受
Ｊ・・・中心軸

DESCRIPTION OF SYMBOLS 1 ... Blower 2 ... Motor 3, 3A ... Rotating part 31, 31A ... Top surface part 310, 310A ... Through-hole 3101 ... 1st through-hole 3102 ... 2nd through-hole 311, 311 </ b> A... Upper edge portion 312, 312 </ b> A... Lower edge portion 313, 313 </ b> A ... First slope surface 314 ... Second slope surface 32, 32 </ b> A ... Tube portion 33 ... Shaft 34 ... Magnet 35 ... Housing part 36 ... Rotor holder 37 ... Blade 4 ... Static part 41 ... Stator 42 ... Stator core 42a ... Core back 42b ... Teeth 43 ... Insulator 44 ... Coil 45 ... Circuit board 46 ... Bearing holder 5 ... Bearing J ... Center axis

Claims (9)

モータであって、
マグネットを有し、上下に延びる中心軸を中心として回転する回転部と、
ステータを有し、前記回転部を回転可能に支持する静止部と、
を有し、
前記回転部は、
前記中心軸を中心に軸方向に延びるシャフトと、
前記シャフトから径方向に延びる天面部と、
前記天面部から軸方向に延びる筒状の筒部と、
を有し、
前記天面部は、
軸方向に貫通する少なくとも一つの貫通孔と、
前記貫通孔を形成する前記天面部の上面の上縁部と、
前記貫通孔を形成する前記天面部の下面の下縁部と、
を有し、
前記天面部が、
前記貫通孔の径方向内側において、前記貫通孔の前記上縁部から前記下縁部に向かって前記中心軸から離れる方向に傾斜する第１傾斜面をさらに有する、モータ。 A motor,
A rotating part having a magnet and rotating around a central axis extending vertically;
A stationary part having a stator and rotatably supporting the rotating part;
Have
The rotating part is
A shaft extending in the axial direction around the central axis;
A top surface portion extending radially from the shaft;
A cylindrical tube portion extending in the axial direction from the top surface portion;
Have
The top surface portion is
At least one through-hole penetrating in the axial direction;
An upper edge portion of the upper surface of the top surface portion forming the through hole;
A lower edge portion of the lower surface of the top surface portion forming the through hole;
Have
The top surface is
The motor further comprising a first inclined surface that is inclined in a direction away from the central axis from the upper edge portion of the through hole toward the lower edge portion on the radially inner side of the through hole. 前記天面部が、
前記貫通孔の径方向外側において、前記上縁部から前記下縁部に向かって前記中心軸に離れる方向に傾斜する第２傾斜面をさらに有する、請求項１に記載のモータ。 The top surface is
The motor according to claim 1, further comprising a second inclined surface that is inclined in a direction away from the central axis from the upper edge portion toward the lower edge portion on a radially outer side of the through hole. 前記上縁部を通り前記中心軸に平行な面と前記第１傾斜面とのなす角θ１は、前記上縁部を通り前記中心軸に平行な面と前記第２傾斜面とのなす度θ２よりも大きい、請求項１または請求項２に記載のモータ。 An angle θ1 formed between a surface passing through the upper edge and parallel to the central axis and the first inclined surface is an angle θ2 formed between a surface passing through the upper edge and parallel to the central axis and the second inclined surface. The motor according to claim 1 or 2, which is larger than the motor. 前記第１傾斜面の径方向外側端部は、前記第２傾斜面の径方向内側端部と径方向に同じ位置または径方向内側に位置する、請求項２または請求項３に記載のモータ。 4. The motor according to claim 2, wherein the radially outer end portion of the first inclined surface is located at the same radial position or radially inward as the radially inner end portion of the second inclined surface. 前記貫通孔は、平面視において、径方向に垂直な方向に長辺を有する長方形状である、請求項１から請求項４のいずれかに記載のモータ。 The motor according to any one of claims 1 to 4, wherein the through hole has a rectangular shape having a long side in a direction perpendicular to the radial direction in plan view. 請求項１から５のいずれかに記載のモータを有する送風機であって、
前記筒部は、径方向外側において周方向に複数の羽根を有する、送風機。 A blower having the motor according to any one of claims 1 to 5,
The said cylinder part is a blower which has a some blade | wing in the circumferential direction on the radial direction outer side. 前記回転部は、前記筒部および前記天面部の内側に配置されてマグネットを保持するロータホルダを有し、
前記ロータホルダは、
前記天面部の軸方向下側に配置される板部と、
前記板部を軸方向に貫通する少なくとも１つのホルダ孔と、
を有し、
前記貫通孔の少なくとも一部は、軸方向から見て前記ホルダ孔と重なる位置に配置される、請求項６に記載の送風機。 The rotating portion has a rotor holder that is disposed inside the cylindrical portion and the top surface portion and holds a magnet,
The rotor holder is
A plate portion disposed on the lower side in the axial direction of the top surface portion;
At least one holder hole passing through the plate portion in the axial direction;
Have
The blower according to claim 6, wherein at least a part of the through hole is disposed at a position overlapping the holder hole when viewed from the axial direction. 前記貫通孔は、前記ホルダ孔よりも開口面積の大きい第１貫通孔を含む、請求項７に記載の送風機。 The blower according to claim 7, wherein the through hole includes a first through hole having a larger opening area than the holder hole. 前記貫通孔は、前記ホルダ孔と同等の開口面積を有する第２貫通孔をさらに含む、請求項８に記載の送風機。

The blower according to claim 8, wherein the through hole further includes a second through hole having an opening area equivalent to the holder hole.

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021153661A1 (en) * 2020-01-28 2021-08-05 ミネベアミツミ株式会社 Motor and blower device

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