201015280 九、發明說明： .【發明所屬之技術領域】 本發明涉及一種散熱風扇及其轉子。 【先前技術】 隨著電子技術的飛速發展，中央處理器等發熱電子元 件運行速度越來越快，其運行時產生的熱量亦相應增加， 為將熱量散發出去以保障電子元件正常運行，業界採用風 ©扇對電子元件進行散熱。習知風扇一般包括一扇框、及收 容於該扇框中的-定子及一轉子。轉子包括一輪較、環設 於輪較外圍的複數扇葉及設於輪轂内壁的磁環。該磁環包 括筒狀馬達殼及一設於馬達殼内壁的磁條。馬達殼的頂 端向内#折开>成一内緣以增強馬達殼的強度使之不易變 形該内緣的外側抵靠於輪轂的内端部。該磁條的頂端抵 靠於該内緣的内側面，因馬達殼的内緣將磁條與輪轂的内 ©端部關’使得磁條無法進_步延伸至抵靠於輪轂的内端 邛，使磁條的尚度受到限制，從而減小了轉子與定子間的 磁偏量，轉子與定子的吸附力減弱，轉子在旋轉時易於產 生軸向上的串動而產生噪音。 【發明内容】 鑒於此’有必要提供一種可有效增強與定子間吸附力 的轉子及採用該轉子的散熱風扇。 種政熱風扇，包括底座、定子及轉子，該定子固定 6 201015280 於該底座上，該轉子包括一輪較及設於該輪轂内壁的一磁 組，該輪轂包括一端部及自該端部周緣延伸形成的一側 壁，該磁組包括一中空殼體及一永久磁鐵，該殼體貼設於 該輪轂的侧壁的内側，該永久磁鐵貼附於該殼體的内壁， 該殼體包括一圓柱形本體及自該本體的底端向外翻折形成 一環形折邊’該永久磁鐵的頂端抵靠於該輪轂的端部。 一種轉子’包括一輪轂及設於該輪轂内壁的一磁組， ❿該輪轂包括一端部及自該端部周緣延伸形成的一側壁，該 磁組包括一中空殼體及一永久磁鐵，該殼體貼設於該輪轂 的侧壁的内側，該永久磁鐵貼附於該殼體的内壁，該殼體 包括一圓柱形本體及自該本體的底端向外翻折形成一環形 折邊，該永久磁鐵的頂端抵靠於該輪轂的端部。 上述散熱風扇中’該永久磁鐵抵靠於輪轂的端部的内 侧’與習知風扇相比，該永久磁鐵沿軸向上的中心相對上 ❹移’轉子與定子間的磁偏量增大，轉子與定子間的吸附力 增強’從而抑制了轉子旋轉時的軸向串動，從而降低了噪 音。同時’該環形折邊增強了殼體的強度，使殼體於組裝 和運輸過程中不易變形，從而保證殼體的真圓度，防止於 轉子旋轉時設於殼體内侧的永久磁鐵與定子產生磨擦。 【實施方式】 清一併參閱圖1’散熱風扇包括一底座1〇、一定子2〇 及一轉子30。該定子20固定於底座1〇上，該轉子30罩覆 201015280 於定子20的外圍。 • 底座10的中央向上設一中空中柱12，一軸承14收容 於該中柱12内。 定子20包括一定子鐵心22、一線圈24、一電路板26 及兩絕緣架28。該定子鐵心22由複數碎鋼片堆疊而成，兩 絕緣架28分別設於定子鐵心22的上下端，線圈24纏繞於 絕緣架28上，電路板26與線圈24電性相連以對線圈24 φ供電。兩絕緣架28由絕緣材料製成，該兩絕緣架28將線 圈24與定子鐵心22分離，達到將二者絕緣的作用。 轉子30包括一輪轂32、一轉軸34、複數扇葉36及一 磁組38。該輪轂32包括一圓形的端部324及自該端部324 的周緣垂直向下延伸的一筒狀侧壁322。該端部324的中央 向下凸起形成一軸座321，所述轉軸34自該軸座321豎直 向下延伸形成一自由端。該複數扇葉36環設於該側壁322 φ的外圍，該磁組38貼設於側壁322的内表面，該侧壁322 内表面的底端内凹形成一環形凹陷386。 請一併參閱圖2及圖3,所述磁組38包括一中空殼體 382及設於殼體382内側的一永久磁鐵384。該殼體382包 括一圓柱形本體381及自本體381底端向外翻折形成的一 環形折邊383,該環形折邊383的設置使殼體382的製造更 為方便，折邊383還增強了殼體382的強度，使殼體382 於組裝和運輸過程中不易變形，從而保證殼體382的真圓 201015280 度。殼體382的本體381的外侧貼附於輪轂32的侧壁322 •的内表面上，殼體382的折邊383嵌入至輪轂32的側壁322 •底端的凹陷386内，殼體382的頂端抵靠於輪轂32的端部 324的内侧，永久磁鐵384的頂端和底端分別與殼體382 的頂端和底端相平齊。從而永久磁鐵384的頂端抵靠於輪 轂32的端部324的内側。 組裝時，定子20套設於中柱12上，轉子30的轉轴34 φ的自由端穿設於軸承14内，轉子30的輪轂32罩覆於定子 20上，輪轂32的側壁322位於定子20的外圍，磁組38 的永久磁鐵384與定子20相對。因永久磁鐵384的頂端抵 靠於輪轂32的端部324的内側，相較於習知風扇，該散熱 風扇的永久磁鐵384高度增加，該永久磁鐵384沿軸向上 的中心也相對定子20的中心上移，從而使轉子30與定子 20間的磁偏量Η增大，使轉子30與定子20間的吸附力增 ❿大，抑制了轉子30旋轉時軸向上的串動，從而降低散熱風 扇的噪音。此外，該散熱風扇倒置時，由於磁偏的增大增 強了轉子30與定子20間的吸附力，轉子30較不易受地心 引力的影響而產生弱磁現象而影響散熱風扇的正常工作。 同時，由於殼體382的料邊383與輪轂32的側壁322底端 的凹陷386存在配位關係，從而方便組裝與定位，使磁組 38在輪轂32中的位置更加精准。此外，殼體382的折邊 383保證了殼體382的真圓度，防止於轉子30旋轉時設於 201015280 殼體382内侧的永久磁鐵384與定子20產生磨擦，從而保 ‘障散熱風扇的正常工作。 如上所述，該轉子30可用於軸流風扇、離心風扇或其 他種類的風扇。 綜上所述，本發明確已符合發明專利之要件，遂依法 提出專利申請。惟，以上所述者僅為本發明之較佳實施方 式，自不能以此限制本案之申請專利範圍。舉凡熟悉本案 ❿技藝之人士援依本發明之精神所作之等效修飾或變化，皆 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 圖1為本發明散熱風扇較佳實施例的剖視圖。 圖2為圖1中磁組的立體示意圖。 圖3為圖2的立體剖視圖。 【主要元件符號說明】 .底座 10 中柱 12 軸承 14 定子 20 定子鐵心 22 線圈 24 電路板 26 絕緣架 28 轉子 30 輪轂 32 軸座 321 侧壁 322 端部 324 轉軸 34 扇葉 36 磁組 38 201015280 本體 381 殼體 382 1折邊 383 永久磁鐵 384 凹陷 386201015280 IX. Description of the invention: [Technical field to which the invention pertains] The present invention relates to a heat dissipation fan and a rotor thereof. [Prior Art] With the rapid development of electronic technology, the heat-generating electronic components such as the central processing unit are running faster and faster, and the heat generated during operation is correspondingly increased. In order to dissipate heat to ensure the normal operation of electronic components, the industry adopts The wind© fan dissipates heat from the electronic components. Conventional fans generally include a frame and a stator and a rotor housed in the frame. The rotor includes a plurality of blades, a plurality of blades disposed on the outer periphery of the wheel, and a magnetic ring disposed on the inner wall of the hub. The magnetic ring includes a cylindrical motor casing and a magnetic strip disposed on an inner wall of the motor casing. The top end of the motor casing is folded inwardly to form an inner edge to enhance the strength of the motor casing so as not to be deformed so that the outer side of the inner edge abuts against the inner end portion of the hub. The top end of the magnetic strip abuts against the inner side of the inner edge, and the magnetic strip and the inner end of the hub are closed by the inner edge of the motor casing so that the magnetic strip cannot extend to the inner end of the hub. In order to limit the magnetic strip, the magnetic bias between the rotor and the stator is reduced, the adsorption force of the rotor and the stator is weakened, and the rotor is prone to axial movement in the rotation when the rotor rotates to generate noise. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a rotor which can effectively enhance the adsorption force with the stator and a heat dissipation fan using the same. The heat fan includes a base, a stator and a rotor. The stator is fixed on the base. The rotor includes a wheel and a magnetic group disposed on an inner wall of the hub. The hub includes an end portion and extends from a periphery of the end. Forming a side wall, the magnetic group includes a hollow casing and a permanent magnet attached to an inner side of a sidewall of the hub, the permanent magnet is attached to an inner wall of the casing, and the casing includes a cylinder The shaped body and the bottom end of the body are folded outward to form an annular flange. The top end of the permanent magnet abuts against the end of the hub. A rotor 'including a hub and a magnetic group disposed on an inner wall of the hub, the hub includes an end portion and a side wall extending from a periphery of the end, the magnetic group including a hollow casing and a permanent magnet, The housing is attached to the inner side of the side wall of the hub, and the permanent magnet is attached to the inner wall of the housing. The housing includes a cylindrical body and is folded outward from the bottom end of the body to form an annular flange. The top end of the permanent magnet abuts against the end of the hub. In the above-mentioned cooling fan, 'the permanent magnet abuts against the inner side of the end portion of the hub'. Compared with the conventional fan, the permanent magnet is relatively moved upward along the axial center. The magnetic offset between the rotor and the stator is increased. The adsorption force between the stator and the stator is enhanced, thereby suppressing axial crosstalk when the rotor rotates, thereby reducing noise. At the same time, the annular flange enhances the strength of the casing, so that the casing is not easily deformed during assembly and transportation, thereby ensuring the roundness of the casing and preventing permanent magnets and stators disposed on the inner side of the casing when the rotor rotates. friction. [Embodiment] Referring to Fig. 1', the cooling fan includes a base 1 一定, a stator 2 〇, and a rotor 30. The stator 20 is fixed to the base 1 , and the rotor 30 covers the periphery of the stator 20 at 201015280. • A center pillar 12 is disposed upwardly from the center of the base 10, and a bearing 14 is received in the center pillar 12. The stator 20 includes a stator core 22, a coil 24, a circuit board 26, and two insulating frames 28. The stator core 22 is formed by stacking a plurality of pieces of steel. The two insulating frames 28 are respectively disposed at the upper and lower ends of the stator core 22. The coil 24 is wound around the insulating frame 28. The circuit board 26 is electrically connected to the coil 24 to the coil 24 φ. powered by. The two insulating frames 28 are made of an insulating material, and the two insulating frames 28 separate the coil 24 from the stator core 22 to insulate the two. The rotor 30 includes a hub 32, a shaft 34, a plurality of blades 36, and a magnetic assembly 38. The hub 32 includes a rounded end 324 and a cylindrical side wall 322 extending vertically downward from the periphery of the end 324. The center of the end portion 324 is downwardly convexly formed to form a shaft seat 321 from which the shaft 34 extends vertically downward to form a free end. The plurality of blades 36 are disposed on the outer periphery of the side wall 322 φ. The magnetic group 38 is attached to the inner surface of the side wall 322. The bottom end of the inner surface of the side wall 322 is recessed to form an annular recess 386. Referring to FIG. 2 and FIG. 3 together, the magnetic assembly 38 includes a hollow housing 382 and a permanent magnet 384 disposed on the inner side of the housing 382. The housing 382 includes a cylindrical body 381 and an annular flange 383 which is folded outwardly from the bottom end of the body 381. The arrangement of the annular flange 383 facilitates the manufacture of the housing 382, and the flange 383 is also enhanced. The strength of the housing 382 is such that the housing 382 is not easily deformed during assembly and transportation, thereby ensuring a true circle of the housing 382 of 201015280 degrees. The outer side of the body 381 of the housing 382 is attached to the inner surface of the side wall 322 of the hub 32. The flange 383 of the housing 382 is embedded in the side wall 322 of the hub 32. The bottom end is recessed 386, and the top end of the housing 382 is abutted. Against the inside of the end 324 of the hub 32, the top and bottom ends of the permanent magnet 384 are flush with the top and bottom ends of the housing 382, respectively. Thereby, the top end of the permanent magnet 384 abuts against the inner side of the end portion 324 of the hub 32. During assembly, the stator 20 is sleeved on the center pillar 12, and the free end of the rotating shaft 34φ of the rotor 30 is bored in the bearing 14. The hub 32 of the rotor 30 covers the stator 20, and the side wall 322 of the hub 32 is located in the stator 20. On the periphery, the permanent magnet 384 of the magnetic group 38 is opposed to the stator 20. Since the tip end of the permanent magnet 384 abuts against the inner side of the end portion 324 of the hub 32, the height of the permanent magnet 384 of the heat radiating fan is increased as compared with the conventional fan, and the center of the permanent magnet 384 in the axial direction is also opposed to the center of the stator 20. The upward movement causes the magnetic bias amount Η between the rotor 30 and the stator 20 to increase, so that the adsorption force between the rotor 30 and the stator 20 is increased, and the axial movement in the rotation of the rotor 30 is suppressed, thereby reducing the cooling fan. noise. In addition, when the cooling fan is inverted, the adsorption force between the rotor 30 and the stator 20 is increased due to the increase of the magnetic bias, and the rotor 30 is less susceptible to the influence of the gravity of the earth to cause a weak magnetic phenomenon and affect the normal operation of the cooling fan. At the same time, since the material side 383 of the casing 382 has a matching relationship with the recess 386 at the bottom end of the side wall 322 of the hub 32, the assembly and positioning are facilitated, and the position of the magnetic group 38 in the hub 32 is more precise. In addition, the folded edge 383 of the housing 382 ensures the roundness of the housing 382, preventing the permanent magnet 384 disposed on the inner side of the housing 382 from being slid on the inner side of the housing 382 when the rotor 30 rotates, thereby preventing the normal operation of the cooling fan. jobs. As described above, the rotor 30 can be used for an axial fan, a centrifugal fan or the like. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art and in the spirit of the present invention are intended to be included within the scope of the following claims. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a preferred embodiment of a heat dissipation fan of the present invention. 2 is a perspective view of the magnetic group of FIG. 1. Fig. 3 is a perspective cross-sectional view of Fig. 2; [Main component symbol description] . Base 10 Middle column 12 Bearing 14 Stator 20 Stator core 22 Coil 24 Circuit board 26 Insulation frame 28 Rotor 30 Hub 32 Shaft seat 321 Side wall 322 End 324 Rotary shaft 34 Fan blade 36 Magnetic group 38 201015280 Body 381 housing 382 1 hemming 383 permanent magnet 384 recess 386
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