201005187 九、發明說明： 【發明所屬之技術領域】 本發明是有關於一種散熱風扇，特別是指一種可平衡 轉動的單定子外極式散熱風扇。 【先前技術】 參閱圖1、2(為方便說明圖1中省略了部分元件），現有 的單定子外極式散熱風扇1包含一殼座U、一樞設於該殼 座11内的扇輪單元12、一設置於該殼座u上而能控制該 ® 扇輪單元12啟動的電路板13,及一設置於該殼座n上而 能驅使該扇輪單元12產生旋轉之定子14。 該扇輪單元12具有一輪轂121、一與該輪轂121結合 之轉動軸122、多數輻射狀地間隔設置於該輪轂121周面上 的扇葉123，以及一環設於每一扇葉123外端緣上的磁鐵環 124 〇 該疋子14是與該電路板13電連接，當該電路板13通 φ 電後，該定子14便會被通電激磁，而與該扇輪單元12之 磁鐵環124產生磁性感應互斥，進而驅動該扇輪單元12產 生旋轉。 現有單定子外極式散熱風扇1由於僅利用設置於該扇 輪單70 12之外周緣的單一定子14與磁鐵環124所產生的 磁力互斥而驅動該扇輪單元12轉動，由於磁力互斥所產生 的推力僅作用於該扇輪單元12鄰近該定子14的磁鐵環124 外側緣’使該扇輪單元12的受力不平均，造成該扇輪單元 K會產生如圖2中假想線所示的傾斜轉動不但使得該扇 201005187 輪單元12於轉動時會容易產生偏擺而比較不穩定，且亦會 於轉動時產生噪音，更會大幅縮短該單定子外極式散熱風 扇1的使用壽命。 【發明内容】 因此，本發明之目的，即在提供一種可以減少噪音， 並延長使用壽命之可平衡轉動的單定子外極式散熱風扇。 於是’本發明可平衡轉動的單定子外極式散熱風扇是 包含一框架單元、一扇輪單元、一驅動單元，及一平衡單 元0 該框架單元包括一底座，及一凸設於該底座上的中心 軸。該扇輪單元包括一梅設於該中心轴上的輪較、多數片 由該輪轂外周緣間隔向外延伸的扇葉，及一環設於所述扇 葉外周緣的磁鐵環。 該驅動單元包括一固設於該底座上的電路板，及一電 連接該電路板的磁極柱，其中，該磁極柱係設置於該磁鐵 環外周緣，該平衡單元包括至少一個設於該磁鐵環外周緣 而與該磁極柱相間隔地設置於該底座上的導磁體。 該磁極柱通電後產生交變磁場，與該磁鐵環的磁力相 斥而推動該扇輪單元轉動，而該導磁體則對該磁鐵環產生 吸力，使該扇輪單元處於平衡轉動的狀態。 本發明之功效在於利用該導磁體對該扇輪單元之磁鐵 環所產生的吸力拉動該磁鐵環’使該扇輪單元處於平衡轉 動的狀態，不但可以使該扇輪單元的轉動更為平順，有效 減少扇輪單元轉動時所發出的噪音，更可以延長該單定子 201005187 外極式散熱風扇之使用壽命β 【實施方式】 有關本發明之前述及其他技術内容、特點與功效’在 以下配合參考圖式之二個較佳實施例的詳細說明中，將可 清楚的呈現。 在本發明被詳細描述之前，要注意的是，在以下的說 明内容中，類似的元件是以相同的編號來表示。 參閱圖3與圖4(為方便說明，圖3中省略了部分的元 件），本發明可平衡轉動的單定子外極式散熱風扇2之第一 較佳實施例包含一框架單元21、一扇輪單元22、一驅動單 元23’及一平衡單元24。 該框架單元21包括一底座211、一凸設於該底座211 上的中心轴212’及一蓋設於該底座211上的殼蓋213。該 扇輪單元22包括一樞設於該中心軸212上的輪轂221、多 數片由該輪轂221外周緣間隔向外延伸的扇葉222，及一環 設於所述扇葉222外周緣的磁鐵環223。 該驅動單元23包括一固設於該底座211上的電路板 231，及一電連接該電路板231的磁極柱232，其中，該磁 極柱232係设置於該磁鐵環223外周緣；該平衡單元24包 括一個設於該磁鐵環223外周緣而與該磁極柱232相間隔 地設置於該底座211上的導磁體241，該導磁體241是位於 該驅動單兀23之磁極柱232的相對側。於本較佳實施例中 該導磁體241是一磁鐵。 該磁極柱232通電後產生交變磁場，與該磁鐵環 201005187 、、相斥而推動該扇輪單元22轉動，而該導磁體24〗則 於該磁極柱232的相對側對該磁鐵環223產生吸力，以避 、扇輪單元22相反於該磁極柱232的-側緣因該磁極柱 的推力而發生傾斜’使該扇輪單元22能處於轉動平衡 的狀態進而使該扇輪單元22的轉動更為平順，以降低轉 動時所發出的噪音，並有效延長該單定子外極式散熱風扇2 之使用壽命。 參閲圖5(為方便說明，圖5中省略了部分的元件），本 發月可平衡轉動的單定子外極式散熱風扇2的第二較佳實⑩ 施例大致上是與該第一較佳實施例相同，包含一框架單 兀21、一扇輪單元22、一驅動單元23，及一平衡單元以 j其中不相同之處在於：該平衡單元24包括二個設置於該 磁鐵環223外周緣而與該磁極柱232相間隔地設置於該底 上的導磁體241，該二導磁體241與該磁極柱232是 等角度地間隔環設於該磁鐵環如外周緣，利用該二導磁 體 的吸力避免該扇輪單元22相反於該磁極柱232的一 側緣因.亥磁極柱232的推力而發生傾斜，使該扇輪單元Μ鬱 ^處於轉動平衡的狀態’降低轉動時所發出的噪音，並有 效延長該單定子外極式散熱風扇2之使用壽命，提供一種 不同於該第一較佳實施例的實施態樣。 综上所述’本發明可平衡轉動的單定子外極式散熱風 扇2將該平衡單元24的導磁體241是與該磁極柱232對 應設置於該底座211上’利用該導磁體241的吸力與該磁極 柱232的推力相配合，使該扇輪單元22能處於轉動平衡的 201005187 狀態，進而使該扇輪單元22的轉動更為穩定平順而不會產 生偏擺’以降低轉動時所發出的噪音，並有效延長整體單 疋子外極式散熱風扇2的使用壽命，故確實能達成本發明 之目的。 惟以上所述者，僅為本發明之較佳實施例而已，當不 能以此限定本發明實施之範圍，即大凡依本發明申請專利 範圍及發明說明内容所作之簡單的等效變化與修飾，皆仍 屬本發明專利涵蓋之範圍内。201005187 IX. Description of the Invention: [Technical Field] The present invention relates to a cooling fan, and more particularly to a single-stator external-pole cooling fan that can be balanced and rotated. [Prior Art] Referring to Figures 1 and 2 (some components are omitted in Fig. 1 for convenience), the conventional single-stator external-pole cooling fan 1 includes a housing U and a fan wheel pivotally mounted in the housing 11. The unit 12, a circuit board 13 disposed on the housing u to control activation of the ® fan unit 12, and a stator 14 disposed on the housing n to drive the fan unit 12 to rotate. The fan wheel unit 12 has a hub 121, a rotating shaft 122 coupled to the hub 121, a plurality of blades 123 radially spaced from the circumferential surface of the hub 121, and a ring disposed at the outer end of each of the blades 123. The magnet ring 124 on the edge is electrically connected to the circuit board 13. When the circuit board 13 is turned on, the stator 14 is energized and the magnet ring 124 of the fan unit 12 is energized. Magnetic induction is mutually exclusive, which in turn drives the fan wheel unit 12 to produce rotation. The conventional single-stator external-pole type cooling fan 1 drives the fan-wheel unit 12 to rotate by utilizing only the magnetic force generated by the single stator 14 and the magnet ring 124 disposed on the outer periphery of the fan-single unit 70 12, due to the mutual magnetic force The thrust generated by the repulsion only acts on the outer edge of the magnet ring 124 of the stator unit 12 adjacent to the stator 14 to make the force of the fan unit 12 uneven, so that the fan unit K will produce an imaginary line as shown in FIG. The tilting rotation shown not only makes the fan of the 201005187 wheel unit 12 easy to yaw when rotated, but also generates noise when rotating, and greatly shortens the use of the single-stator external-pole cooling fan 1. life. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a balanced single-stator external-pole cooling fan that can reduce noise and extend service life. Thus, the single-stator external-pole cooling fan of the present invention can include a frame unit, a fan unit, a driving unit, and a balancing unit. The frame unit includes a base, and a protruding portion is disposed on the base. The center axis. The fan wheel unit includes a wheel set on the central shaft, a plurality of blades extending outwardly from the outer periphery of the hub, and a ring of magnets disposed on the outer periphery of the blade. The driving unit includes a circuit board fixed on the base, and a magnetic pole column electrically connected to the circuit board, wherein the magnetic pole column is disposed on an outer circumference of the magnet ring, and the balancing unit includes at least one magnet disposed on the magnet a magnetizer disposed on the base at an outer circumference of the ring and spaced apart from the pole. When the pole is energized, an alternating magnetic field is generated, which is repelled by the magnetic force of the magnet ring to push the fan unit to rotate, and the magnetizer generates suction force to the magnet ring, so that the fan unit is in a state of balanced rotation. The utility model has the advantages that the magnetizing force generated by the magnet ring of the fan wheel unit is pulled by the magnetizer to make the fan wheel unit in a state of balanced rotation, which can not only make the rotation of the fan wheel unit smoother. Effectively reducing the noise generated when the fan wheel unit rotates, and prolonging the service life of the single-pole stator 201005187 external-pole cooling fan. [Embodiment] The foregoing and other technical contents, features and effects of the present invention are referred to below. The detailed description of the two preferred embodiments of the drawings will be apparent. Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals. Referring to FIG. 3 and FIG. 4 (some components are omitted in FIG. 3 for convenience of explanation), the first preferred embodiment of the single-stator external-pole cooling fan 2 of the present invention capable of balancing rotation comprises a frame unit 21 and a fan. The wheel unit 22, a driving unit 23' and a balancing unit 24. The frame unit 21 includes a base 211, a central shaft 212' protruding from the base 211, and a cover 213 attached to the base 211. The fan wheel unit 22 includes a hub 221 pivotally mounted on the central shaft 212, a plurality of blades 222 extending outwardly from the outer periphery of the hub 221, and a ring of magnets disposed on the outer periphery of the blade 222. 223. The driving unit 23 includes a circuit board 231 fixed on the base 211, and a magnetic pole 232 electrically connected to the circuit board 231. The magnetic pole 232 is disposed on the outer circumference of the magnet ring 223; the balancing unit 24 includes a magnet 241 disposed on the outer periphery of the magnet ring 223 and spaced apart from the pole 232 on the base 211. The magnet 241 is located on the opposite side of the pole 232 of the drive unit 23. In the preferred embodiment, the magnet 241 is a magnet. When the magnetic pole 232 is energized, an alternating magnetic field is generated, and the magnet ring 201005187 is repelled to push the fan unit 22 to rotate, and the magnetic conductor 24 is generated on the opposite side of the magnetic pole 232. Suction, so that the fan wheel unit 22 is inclined with respect to the side edge of the pole 232 due to the thrust of the pole post ′, so that the fan wheel unit 22 can be in a state of rotational balance and thus the rotation of the fan wheel unit 22 It is smoother to reduce the noise generated during rotation and effectively extend the service life of the single-stator external-pole cooling fan 2. Referring to FIG. 5 (some components are omitted in FIG. 5 for convenience of explanation), the second preferred embodiment 10 of the single-stator external-pole cooling fan 2 that can be balanced and rotated in the present month is substantially the same as the first The preferred embodiment is the same, comprising a frame unit 21, a fan unit 22, a driving unit 23, and a balancing unit. The difference between the two is that the balancing unit 24 includes two magnet rings 223. a magnetizer 241 disposed on the bottom of the outer periphery and spaced apart from the pole 232. The two magnets 241 and the pole 232 are equiangularly spaced apart from the outer circumference of the magnet ring, and the second guide is utilized. The suction force of the magnet prevents the side of the fan unit 22 from being inclined with respect to the side edge of the pole 232 due to the thrust of the magnetic pole 232, so that the fan unit is in a state of rotational balance. The noise, and effectively extending the service life of the single stator outer pole type cooling fan 2, provides an embodiment different from the first preferred embodiment. In summary, the single-stator external-pole type heat-dissipating fan 2 of the present invention can be disposed on the base 211 corresponding to the pole 241 of the balance unit 24 by utilizing the suction force of the magnetizer 241. The thrust of the pole 232 is matched to enable the fan unit 22 to be in a rotationally balanced state of 201005187, thereby making the rotation of the fan unit 22 more stable and smooth without yaw 'to reduce the rotation. The noise, and effectively extending the service life of the overall single-twist external-pole cooling fan 2, can indeed achieve the object of the present invention. The above is only the preferred embodiment of the present invention, and the scope of the invention is not limited thereto, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention are All remain within the scope of the invention patent.
【圖式簡單說明】 圖1是-俯視圖，說明現有單定子外極式散熱風扇， 其中’省略了部分元件； 圖2是一剖視圖’輔助說明圖1 ; 圖3是-俯視圖，說明本發明可平衡轉動的單 極式散熱風扇之第一較佳實施例，盆 • 八 ’略了部分元件 圖5是-俯視圖，說明本發明可平衡 極式散熱風扇之第二較佳實施例，其中 、疋子夕 。 戈略了部分元件 9 201005187 【主要元件符號說明】 2 · * * · ••…單定子外極式散 222 ·· …扇葉 熱風扇 223 ···· …磁鐵環 21·*·· ……框架單元 23…… …驅動單元 211 ·· .....底座 231 …電路板 212 ·· .....中心轴 232 *… …磁極柱 213 - 。…·殼蓋 K ♦ * 4 Ϊ ♦ …平衡單元 22 · * * ••…扇輪單元 241 …， …導磁體 221 · ……輪轂 10BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing a conventional single-stator external-pole heat-dissipating fan, in which 'some of the components are omitted; FIG. 2 is a cross-sectional view of FIG. 1; FIG. 3 is a plan view showing the present invention. The first preferred embodiment of the balanced rotating single-pole heat dissipating fan, the basin 8' is a partial component, FIG. 5 is a top view, illustrating a second preferred embodiment of the balanced pole cooling fan of the present invention, wherein Child eve. Goro has some components 9 201005187 [Main component symbol description] 2 · * * · ••...Single stator external pole dispersion 222 ··...fan blade heat fan 223 ···· ... magnet ring 21·*·· ...... Frame unit 23 ... drive unit 211 ..... base 231 ... circuit board 212 · · ..... central axis 232 * ... magnetic pole 213 - . ...·Shell cover K ♦ * 4 Ϊ ♦ ...balance unit 22 · * * ••...fan wheel unit 241 ..., ... magnetizer 221 · ...... wheel hub 10