1281967 九、發明說明： 【發明所屬之技術領域】 本發明涉及-種散熱風扇結構，尤指_種具有較大進風量之散熱 風扇。 【先前技術】 、隨料顏舰賴蚊獨進纽叙顧，cpu等電子 所/肖耗的熱篁愈來愈南，影響電子元件正常運行，通常於發熱電子元 2上女裝-散鮮’於散熱n上安裝_散熱風扇提供關氣流輔助 熱。 ^知之散熱風扇如第十三圖所示，其包括一具有中柱22之扇框2, 一收谷於中柱22内之轴承4，一套設於中柱22上之定子6及一可旋轉 =被軸承4支標之轉子8，該定子6包括一電路板62及電性連結於該 電路板62上之電梅64，該電抠64包括複數疊設之石夕鋼片⑽、置於 石夕鋼片642上、下兩側之絕緣片644及纏繞於該補片642上之繞線 646，轉子8包括-將定子6罩設於其内部之輪穀幻、設於輪穀82内 侧之永久磁鐵84、設於輪轂82與永久磁鐵84之間之殼體85，環嗖 於輪毅82外緣之複數扇葉86及自輪敎82中央向下延伸之轉轴88，該 轉轴88係收容於轴承4内，從而藉由定子6與轉子8之磁場之交互作 用推動轉子8旋轉，提供強制氣流對發熱元件進行散熱。 目前，主要藉由提高風扇轉速或增大風扇尺相達職高風扇性 能之要求，然在講求輕、薄、短、小的今天，必須有高性能小體積之 散熱風扇相配合，風扇業者皆知在相同的風扇尺寸規格及轉速下，要 有，增加轉風扇賴量及降㈣音，其最㈣紐是減少風扇輪毅 直徑。但傳統子之電赌構係、採用沖壓之石夕鋼片多片堆疊而成，所 巧成之疋子整體呈柱狀結構，沿定子之軸向，定子各點之橫截面大小 形狀均相同，從而不僅影響定子之導磁面積及繞線空間，同時受限於 定子之形狀，無法在不改變即有散熱風扇之尺寸下，減小輪轂之體積 以提昇散熱風扇之進風量。 、以，要如何解決上述習用之問題與缺失，減小風扇輪轂之體積， 以提幵散熱風扇之進風量、降低噪音即為從事此行業之相關廠商所亟 欲研究改善之方向所在者。 (§) 7 1281967 【發明内容】 為解決散熱風扇風量不高之技術問題，提供 積從而具有較大進風量之散熱風扇。 /、 一有較大進風面 該散熱風扇，其包括—具有中柱之扇框， ^，-套設於中柱外之定子及—可旋轉地被軸承支擇之=柱二3 ;===磁極板之間的中空套管，該兩磁極二: 進風口向出風π方向形成漸擴之曲面結構。付片—放熱風扇 及植之定子形成漸擴之曲面結構，不僅增加其導磁面積 及4二間’同時可相應地減小輪穀體積，提昇散熱風扇之風量。積 【實施方式】 下面參照附圖，結合實施例作進一步說明。 如^圖，三圖所示’該散熱風扇包括—具有中柱u 10，-收谷於中柱η内之軸承3〇，一套設於中柱u上之定子5 可紋轉地被轴承30支撐之轉子7〇。 扇框10中央向上凸設一中柱u，該中柱u内形成一收容轴承 心孔111 ’該軸承30包括一供轉子7〇穿設之轴孔31。扇框1〇對 應中，11底部形成出風口，與該出風口相應之另一側形成進風口。 «月同時參照第四圖及第五圖，定子5〇係套設於扇框1〇之中柱η 上，自上向下該定子50形成漸擴之曲面結構，即自風扇進風口向出風 口方向該定子5G形絲擴之曲面結構。該定子5Q包括上、下磁極板 51 γ53 ’連結於該兩磁極板51、53之間之中空套管％，纏繞於該上、 下磁極板51、53與中空套管55之間之線圈57及與該線圏57電性連 結之電路板58。 β成上、下磁極板51、53係相互配合，該兩磁極板51、53均包括一 圓壞狀本體511、531及分別自本體511、531外緣延伸之複數片體513、 533^所述片體513、533呈交錯狀間隔設置，相鄰兩片體513、533之 間分別形成凹槽515、535，片體513、533均呈漸擴狀自上向下延伸， 形成漸擴之曲面結構，可有效增加其導磁面積，上磁極板51之片體513 底，以及下磁極板53之片體533頂端分別形成 一缺口 517、537,從而 可藉由該上、下磁極板51、53磁力大小之不對稱性，達到順利起動及 1281967 固定轉向之目的。 該上、下磁極板51、53之本體511、531之内徑大致相同，上磁極 板51之本體511之外徑小於下磁極板53之本體531之外徑，該下磁極 板53之本體531内緣沿其徑向向内形成有一對凸緣539，該中空套管 55係與上磁極板51 —體而成，其外徑與該兩磁極板51、53之内徑相 當，該中空套管55末端對應下磁極板53之凸緣539位置分別設有一 容置相應凸緣539之缺槽551，線圈57係纏繞於該中空套管55上，線 圈57之頂端形成與兩磁極板51、53相應之漸擴狀曲面結構，線圏57 可纏繞於兩磁極板51、53之曲面結構所形成之空間内，從而可增加線 圈57之繞線空間、提昇散熱風扇之扭力，該線圈57可採用絕緣定型 液加以定形，避免鬆散。組裝時，兩磁極板、Sl、53兩相對接，使下磁 極板53之片體533置於上磁極板51之凹槽515内，上磁極板51之片 體513置於下磁極板53之凹槽535内，同時下磁極板53之凸緣539 卡合於中空套管55之缺槽551内，從而將定子50固定為一體。 該兩磁極板51、53表面之絕緣可使用絕緣片或塗佈絕緣高分子材 料方式，塗佈絕緣高分子材料可以降低成本及簡化製造流程。該表面 處理可以是塗佈絕緣層、功能性薄膜等。 如第-圖至第三圖所示，轉子7〇與定子5〇之形狀相應呈漸擴狀 曲面結構，轉子70係罩設於定子50上，其包括一輪轂71，設於輪穀 71内側之永久磁鐵73，設於輪轂71與永久磁鐵73之間之殼體72，環 設於輪穀71外緣之複數扇葉75及自輪數71中央向下延伸之轉軸， 該轉轴77係收容於轴承30之轴孔31内，該輪轂71、殼體72及永久 磁鐵73均呈漸擴狀自頂端向下延伸，輪轂71頂端，即對應風扇之進 風口處形成一直徑小於輪轂71底端外徑之平面，從而便於轉轴乃之 安裝，輪轂71沿其轴線之截面兩側形成近似抛物線狀之外輪廓，從而 輪轂71之體積大大減小，扇葉75之長度相應增加，可有效提昇散鉢 風扇之進風量及降低噪音之產生。 當該散熱風扇運轉時’藉由定子50與轉子70之交互作用推動 子70旋轉，以提供強制氣流對發熱元件進行散熱。由於定子5〇與 轂71之外形均呈漸擴狀曲面結構，從而可有效減小輪轂之體積，增大 扇葉面積，同時該輪毅71自風扇進風口向出風口方向形成漸擴之曲面 結構，當氣流自風扇進風側流向風扇出風側時，可有效減小風扇氣节 1281967 之渦流損失，降低噪音，另，該定子50之漸擴狀曲面結構，還可提高 其導磁面積、增加繞線空間、提昇散熱風扇扭力。 以上所示上磁極板51與中空套管55係一體而成，同理，可利用 粉末冶金一體燒結成型不同之定子結構，如下磁極板53與中空套管55 係一體而成，相應地於中空套管55頂端形成缺槽551，而於上磁極板 51頂端形成與該缺槽551相應之凸緣539。可以理解地，凸緣539與 缺槽551之設置係便於上、下磁極板51、53與中空套管55之連結， 亦可於中空套管55上設置凸緣539，而於相應之上、下磁極板51、53 上設置容置該凸緣539的缺槽551。而凸緣539與缺槽551之數量不限， 可為一個亦可為多個。 第六圖及第七圖所示為本案之另一實施方式，其中上磁極板5ia 底端與缺口 517a相對之一側沿其圓周方向延伸形成一凸塊518a，下磁 極板53a對應該凸塊518a位置形成一相應的卡槽538a，從而該定子5(^ 組接時，該上磁極板51a之凸塊518a置於下磁極板53a之卡槽538a内， 可有效填補氣隙，更有利於散熱風扇之啟動。 如第八圖及第九圖所示，該實施方式中係採用沖壓成型定子5〇b， 其中上、下磁極板51b、53b及中空套管55b均係沖壓而成，同樣，該 兩磁極板51b、53b分別包括一本體511b、531b及複數片體513b、533b， 片體513b、533b均形成漸擴之曲面結構，該中空套管55b之頂端及末 端均形成缺槽551b，對應所述缺槽551b，上磁極板51b之頂端與下磁 極板53b之末端分別形成相應之凸緣519b、53%，從而便於該兩磁極 板51b、53b與中空套管55b之組接。 同理’亦可將凸緣539b、539b設置於中空套管55b上，而相應 地在上、下磁極板51b、53b上設相應之缺槽551b，或可於中空套管 55b之兩端分別設置凸緣與缺槽，如於中空套管55b頂端設置凸緣 519b ’於末端設置凹槽551b，相應地於上磁極板51t)上設置對應中空 套官55b凸緣539b之凹槽551b，於下磁極板53b上設置對應中空套管 55b凹槽551b之凸緣539b。 當藉由粉末冶金技術一體燒結形成該兩磁極板51、51a、53、53a 時，其所使用粉體可以是軟磁性金屬材料、軟磁性複合材料、非晶質 磁性材料及其複合材料。為增強定子5〇、5〇a之磁特性及機械強度，兩 磁極板51、51a、53、53a之磁性材料可採用具核-殼結構之複合性軟磁 1281967 性材料，請參閱第十_，該核_殼結構包括一核心主體8〇及一殼層9〇， 在核心主體80的磁性材料方面選擇以高初細率低磁損之軟磁性材料 為主如軟磁f生金屬材料、非晶質鐵基磁粉（沖〇us ir〇n Base)、 ，鐵粉及其複合材料、軟雜非金屬材料；而在殼層％部分以易形成 南電阻值材料駐要考慮因素，如金屬複合材料、氧化物、中間化合 物（Intermediate Compound)、氧化複合材料、壓電材料 (Piezoelectricity)、超導體材料，使得殼層9〇之電阻值高於核心主體8〇 之電阻值。該複合性軟磁性材料亦可以具有多重核_殼結構，如第十一 圖所不，該種結構主要由複數個磁性核心主體8〇，及複數個殼層9〇,所 ，成，如第十二圖所示，該核-殼結構由多個單一核_殼結構外還包覆一 殼層90”，而每一單一核殼結構包括一核心圭體8〇及一殼層9〇。 以上定子形成漸擴狀曲面結構，可有效增加散熱風扇之導磁面積 與繞線空間，增強散熱風扇之扭力，另外可相應改變輪轂之形狀，增 加散熱風扇之進風量，如當輪轂為半球形時，其體積僅相當於柱狀輪 _體積之2/3，當輪轂為錐形時，其體積僅相當於柱狀輪轂體積之1/3。 同時，藉由定子與輪轂之形狀，還可減小氣流渦流損失，降低散熱風 扇噪音。 •綜上所述，本發明改變習知之柱狀定子及輪轂結構，形成漸擴之 輪轂及定子結構，增強風扇之扭力，減小氣流損失，誠符合新穎性、 創作性及進步性之專利要件，爰依法提出申請，盼審委早曰賜准本案， 以保障創作人之辛苦創作，倘若鈞局有任何稽疑，請不吝來函指示， 創作人定當竭力配合，實感德便。 【圖式簡單說明】 第一圖係散熱風扇組裝示意圖。 第二圖係散熱風扇分解示意圖。 第三圖係散熱風扇剖視圖。 第四圖係定子另一角度示意圖。 第五圖係第四圖之分解示意圖。 第六圖係定子第二實施方式組裝示意圖。 第七圖係第六圖之分解示意圖。 第八圖係定子第三實施方式組裝示意圖。 11 1281967 第九圖係、第圖之分解示意圖。 第十圖係核殼結構示意圖。 第十一圖係核殼結構另一實施方式示意圖。 第十=圖係核殼結構再一實施方式示意圖。 第十三圖係習知散熱風扇剖視圖。 【主要元件符號說明】 扇^ 1〇、2 中心孔 111 轴孔 31 上磁極板 51、51a、51b 片體 513、513b、533、533b 缺口 517、517a、537 凸緣 519b、539、539b 卡槽 538a 缺槽 551、551b 電路板 58、62 輪轂 71、82 永久磁鐵 73、84 轉轴 77、88 殼層 90、90’、90” 中柱 11、22 轴承 30、4 定子 50、50a、50b、6 本體 、511 、511b、531、531b 凹槽 515、535 凸塊 518a 下磁極板 53、53a、53b 中空套管 55、55b 線圈 57 轉子 70、8 殼體 72、85 扇葉 75、86 核心柱體 80、80, 12 β)1281967 IX. INSTRUCTIONS: [Technical Field] The present invention relates to a cooling fan structure, and more particularly to a heat dissipating fan having a large air intake amount. [Prior technology], with the Yan Ship Lai mosquito alone into the New Zealand, cpu and other electronic institutes / Xiao consumption of heat is getting more and more south, affecting the normal operation of electronic components, usually on the heating electronic element 2 women's wear - fresh 'Installation on the heat sink n _ cooling fan provides off airflow auxiliary heat. As shown in the thirteenth figure, the cooling fan includes a fan frame 2 having a center pillar 22, a bearing 4 which is received in the center pillar 22, a stator 6 and a stator 6 disposed on the center pillar 22. Rotating = the rotor 8 supported by the bearing 4, the stator 6 includes a circuit board 62 and an electric plum 64 electrically connected to the circuit board 62. The electric motor 64 includes a plurality of stacked Shishi steel sheets (10). The insulating sheet 644 on the upper and lower sides of the Shishi steel sheet 642 and the winding 646 wound on the patch 642, the rotor 8 includes a wheel illusion that covers the stator 6 and is disposed in the valley 82. The inner permanent magnet 84, the casing 85 disposed between the hub 82 and the permanent magnet 84, the plurality of blades 86 that surround the outer edge of the wheel 82 and the shaft 88 extending downward from the center of the rim 82, the turn The shaft 88 is received in the bearing 4, thereby propelling the rotation of the rotor 8 by the interaction of the magnetic field of the stator 6 and the rotor 8, providing a forced air flow to dissipate heat from the heating element. At present, mainly by increasing the fan speed or increasing the performance of the fan ruler to achieve the performance of the fan, but today, light, thin, short, and small, must have a high-performance small-sized cooling fan to match, the fan industry Knowing that under the same fan size specifications and speed, it is necessary to increase the fan volume and drop (four) tone, and the most (four) button is to reduce the diameter of the fan wheel. However, the traditional electric gambling system is made up of multiple pieces of stamped Shishi steel sheets. The overall shape of the raft is cylindrical. The cross-section of the stator is the same in the axial direction of the stator. Therefore, it not only affects the magnetic conductive area and the winding space of the stator, but also is limited by the shape of the stator, and cannot reduce the volume of the hub to increase the air intake amount of the cooling fan without changing the size of the cooling fan. Therefore, how to solve the above problems and lack of use, reduce the volume of the fan hub, to improve the air intake of the cooling fan, reduce noise is the direction of the relevant manufacturers engaged in research and improvement in this industry. (§) 7 1281967 [Disclosed] In order to solve the technical problem that the cooling fan has a low air volume, a cooling fan with a large intake air volume is provided. /, a cooling fan having a larger air inlet surface, comprising: a fan frame having a center column, ^, - a stator sleeved outside the center column and - rotatably supported by the bearing = column 2 3; == Hollow sleeve between the magnetic plates, the two magnetic poles two: The air inlet forms a diverging curved surface structure toward the wind π direction. The sheet-heating fan and the stator of the plant form a diverging curved surface structure, which not only increases the magnetic permeability area and the 42nd room, but also reduces the volume of the wheel and correspondingly increases the air volume of the cooling fan. [Embodiment] Hereinafter, the embodiments will be further described with reference to the accompanying drawings. As shown in Fig. 3, the heat dissipating fan includes a bearing 3 with a center column u 10, a valley in the center column η, and a stator 5 disposed on the center column u can be rotated by a bearing. 30 supported rotor 7 〇. A center pillar u is protruded upward from the center of the fan frame 10, and a receiving bearing core hole 111 is formed in the center pillar u. The bearing 30 includes a shaft hole 31 through which the rotor 7 is bored. In the fan frame 1 〇, the bottom portion of the 11 forms an air outlet, and the other side corresponding to the air outlet forms an air inlet. «At the same time, referring to the fourth and fifth figures, the stator 5 is sleeved on the column η of the fan frame 1〇, and the stator 50 forms a diverging curved surface structure from the top to the bottom, that is, from the fan air inlet. The tuyere direction is a curved surface structure of the stator 5G-shaped wire. The stator 5Q includes a hollow sleeve % connected between the upper and lower magnetic pole plates 51 γ53' between the two magnetic pole plates 51, 53 and a coil 57 wound between the upper and lower magnetic pole plates 51, 53 and the hollow sleeve 55. And a circuit board 58 electrically connected to the coil 57. The upper and lower magnetic pole plates 51 and 53 are matched with each other, and the two magnetic pole plates 51 and 53 each include a circular body 511 and 531 and a plurality of sheets 513 and 533 respectively extending from the outer edges of the bodies 511 and 531. The sheets 513 and 533 are arranged in a staggered manner, and grooves 515 and 535 are respectively formed between the adjacent two sheets 513 and 533. The sheets 513 and 533 are gradually expanded from the top to the bottom to form a divergent curved surface. The structure can effectively increase the magnetic permeability area, the bottom of the sheet body 513 of the upper magnetic pole plate 51, and the top end of the sheet body 533 of the lower magnetic pole plate 53 respectively form a notch 517, 537, so that the upper and lower magnetic pole plates 51 can be 53 the asymmetry of the magnetic size, to achieve a smooth start and 1281967 fixed steering. The inner diameters of the main bodies 511 and 531 of the upper and lower magnetic pole plates 51 and 53 are substantially the same, the outer diameter of the main body 511 of the upper magnetic pole plate 51 is smaller than the outer diameter of the main body 531 of the lower magnetic pole plate 53, and the main body 531 of the lower magnetic pole plate 53. The inner edge is formed with a pair of flanges 539 formed in the radial direction thereof. The hollow sleeve 55 is formed integrally with the upper magnetic pole plate 51, and the outer diameter thereof is equivalent to the inner diameters of the two magnetic pole plates 51, 53. a flange 551 corresponding to the corresponding flange 539 is disposed at a position corresponding to the flange 539 of the lower magnetic pole plate 53 at the end of the tube 55. The coil 57 is wound around the hollow sleeve 55, and the top end of the coil 57 is formed with the two magnetic pole plates 51, 53 correspondingly the divergent curved surface structure, the coil 57 can be wound in the space formed by the curved structures of the two magnetic pole plates 51, 53 so as to increase the winding space of the coil 57 and improve the torque of the cooling fan, the coil 57 can Use an insulating setting solution to shape it to avoid looseness. When assembled, the two magnetic pole plates, S1, 53 are oppositely connected, so that the sheet body 533 of the lower magnetic pole plate 53 is placed in the groove 515 of the upper magnetic pole plate 51, and the sheet body 513 of the upper magnetic pole plate 51 is placed on the lower magnetic pole plate 53. In the recess 535, the flange 539 of the lower pole plate 53 is engaged in the notch 551 of the hollow sleeve 55, thereby fixing the stator 50 integrally. The surface of the two magnetic plates 51, 53 can be insulated by using an insulating sheet or an insulating polymer material. The application of the insulating polymer material can reduce the cost and simplify the manufacturing process. The surface treatment may be an application of an insulating layer, a functional film or the like. As shown in the first to third figures, the shape of the rotor 7〇 and the stator 5〇 are correspondingly in a divergent curved surface structure, and the rotor 70 is disposed on the stator 50, and includes a hub 71 disposed on the inner side of the wheel valley 71. The permanent magnet 73 is disposed in the casing 72 between the hub 71 and the permanent magnet 73, and is provided with a plurality of blades 75 disposed on the outer edge of the wheel valley 71 and a rotating shaft extending downward from the center of the number of wheels 71. The hub 71, the housing 72 and the permanent magnet 73 extend in a diverging manner from the top end. The top end of the hub 71, that is, the air inlet of the corresponding fan, forms a diameter smaller than the bottom of the hub 71. The plane of the outer diameter of the end is convenient for the shaft to be mounted, and the hub 71 forms an approximately parabolic outer contour along both sides of the section of the axis, so that the volume of the hub 71 is greatly reduced, and the length of the blade 75 is correspondingly increased. Effectively increase the air intake of the fan and reduce the noise. When the cooling fan is in operation, the stator 70 is rotated by the interaction of the stator 50 and the rotor 70 to provide a forced air flow to dissipate the heat generating component. Since the stator 5〇 and the hub 71 have a shape of a divergent curved surface, the volume of the hub can be effectively reduced, and the area of the blade is increased. At the same time, the wheel 71 forms a diverging surface from the fan inlet to the outlet. The structure can effectively reduce the eddy current loss of the fan section 1281967 and reduce the noise when the airflow flows from the fan inlet side to the fan outlet side. In addition, the gradually expanding surface structure of the stator 50 can also increase the magnetic permeability area thereof. Increase the winding space and increase the torque of the cooling fan. The upper magnetic pole plate 51 and the hollow sleeve 55 are integrally formed as described above. Similarly, different stator structures can be formed by powder metallurgy, and the magnetic pole plate 53 and the hollow sleeve 55 are integrally formed as follows, correspondingly hollow. A notch 551 is formed at the top end of the sleeve 55, and a flange 539 corresponding to the notch 551 is formed at the top end of the upper magnetic pole plate 51. It can be understood that the flange 539 and the notch 551 are arranged to facilitate the connection between the upper and lower magnetic pole plates 51, 53 and the hollow sleeve 55, and the flange 539 can also be disposed on the hollow sleeve 55, and correspondingly The lower magnetic pole plates 51, 53 are provided with a notch 551 for receiving the flange 539. The number of the flanges 539 and the notches 551 is not limited, and may be one or more. 6 and 7 are another embodiment of the present invention, wherein a side of the upper end of the upper magnetic pole plate 5ia and a side opposite to the notch 517a extend in a circumferential direction thereof to form a bump 518a, and the lower magnetic pole plate 53a corresponds to the convex block. The 518a position forms a corresponding card slot 538a, so that the stator 5 is assembled, and the bump 518a of the upper magnetic pole plate 51a is placed in the card slot 538a of the lower magnetic pole plate 53a, which can effectively fill the air gap and is more advantageous. Starting of the cooling fan. As shown in the eighth and ninth drawings, in this embodiment, the stamped stator 5〇b is used, wherein the upper and lower magnetic plates 51b and 53b and the hollow sleeve 55b are stamped, and the same The two magnetic pole plates 51b, 53b respectively include a body 511b, 531b and a plurality of sheets 513b, 533b. The sheets 513b, 533b each form a diverging curved surface structure, and the hollow sleeve 55b is formed with a missing groove 551b at the top end and the end. Corresponding to the notch 551b, the top end of the upper magnetic pole plate 51b and the end of the lower magnetic pole plate 53b respectively form corresponding flanges 519b, 53%, thereby facilitating the assembly of the two magnetic pole plates 51b, 53b and the hollow sleeve 55b. Similarly, the flanges 539b and 539b can also be placed in the hollow The tube 55b is provided with a corresponding notch 551b on the upper and lower magnetic pole plates 51b, 53b, or a flange and a notch may be respectively disposed at both ends of the hollow sleeve 55b, as set at the top end of the hollow sleeve 55b. The flange 519b' is provided with a groove 551b at the end, correspondingly, a groove 551b corresponding to the hollow sleeve 55b of the hollow sleeve 51b is provided on the upper magnetic pole plate 51t), and a groove 551b corresponding to the hollow sleeve 55b is disposed on the lower magnetic pole plate 53b. Flange 539b. When the two magnetic pole plates 51, 51a, 53, 53a are integrally sintered by powder metallurgy, the powder used may be a soft magnetic metal material, a soft magnetic composite material, an amorphous magnetic material, and a composite material thereof. In order to enhance the magnetic properties and mechanical strength of the stator 5〇, 5〇a, the magnetic material of the two magnetic pole plates 51, 51a, 53, 53a may be a composite soft magnetic 1281967 material having a core-shell structure, please refer to the tenth _, The core-shell structure comprises a core body 8〇 and a shell layer 9〇. In the magnetic material of the core body 80, a soft magnetic material with high initial fineness and low magnetic loss is selected, such as soft magnetic material, amorphous. Quality iron-based magnetic powder (impressed us ir〇n Base), iron powder and its composite materials, soft and non-metallic materials; and in the shell % part to easily form south resistance value material considerations, such as metal composite materials The oxide, the intermediate compound, the oxidized composite material, the piezoelectric material (Piezoelectricity), and the superconductor material have a resistance value higher than that of the core body 8〇. The composite soft magnetic material may also have a multiple core-shell structure, as shown in FIG. 11 , which is mainly composed of a plurality of magnetic core bodies 8〇, and a plurality of shell layers 9〇, As shown in the twelve figures, the core-shell structure is covered by a plurality of single core-shell structures, and each of the single core shell structures comprises a core body 8 〇 and a shell layer 9 〇. The above stator forms a divergent curved surface structure, which can effectively increase the magnetic conductive area and the winding space of the cooling fan, enhance the torque of the cooling fan, and additionally change the shape of the hub to increase the air volume of the cooling fan, such as when the hub is hemispherical When the volume is only 2/3 of the volume of the cylindrical wheel, when the hub is tapered, its volume is only 1/3 of the volume of the cylindrical hub. At the same time, by the shape of the stator and the hub, The airflow eddy current loss is reduced, and the heat dissipation fan noise is reduced. In summary, the present invention changes the conventional columnar stator and hub structure to form a gradually expanding hub and stator structure, enhances the torque of the fan, and reduces airflow loss. Novelty, creativity Progressive patent requirements, 提出 apply in accordance with the law, and hope that the trial committee will grant the case as early as possible to protect the creators' hard work. If there is any doubt in the scam, please do not hesitate to give instructions, the creator will try his best to cooperate, and the real feelings will be BRIEF DESCRIPTION OF THE DRAWINGS The first figure is a schematic diagram of the assembly of the cooling fan. The second figure is a schematic diagram of the cooling fan. The third picture is a sectional view of the cooling fan. The fourth picture is a schematic view of the stator at another angle. The fifth picture is the fourth picture. The sixth figure is a schematic view of the assembly of the second embodiment of the stator. The seventh figure is an exploded view of the sixth figure. The eighth figure is the assembly diagram of the third embodiment of the stator. 11 1281967 The ninth figure, the decomposition of the figure Fig. 11 is a schematic diagram of a core-shell structure. Figure 11 is a schematic view of another embodiment of a core-shell structure. Tenth is a schematic diagram of a further embodiment of a core-shell structure. Figure 13 is a cross-sectional view of a conventional heat-dissipating fan. [Description of main component symbols] Fan ^ 1〇, 2 Center hole 111 Shaft hole 31 Upper magnetic plate 51, 51a, 51b Sheet 513, 513b, 533, 533b Notch 51 7, 517a, 537 flange 519b, 539, 539b card slot 538a slot 551, 551b circuit board 58, 62 hub 71, 82 permanent magnet 73, 84 shaft 77, 88 shell 90, 90', 90" center column 11, 22 bearings 30, 4 stator 50, 50a, 50b, 6 body, 511, 511b, 531, 531b grooves 515, 535 bumps 518a lower pole plates 53, 53a, 53b hollow sleeves 55, 55b coils 57 rotor 70 , 8 housings 72, 85 blades 75, 86 core cylinders 80, 80, 12 β)