含9.月9曰替換頁j 九、發明說明： 【發明所屬之技術領域】 本發明是關於-種步進馬達，特別是一種定子具遠端 成對輔助磁極之步進馬達。 【先前技術】 10 步進馬it由於可被程式化精密控冑，在許多領域令已 破廣泛接納應用’例如事務機器、精密機械、機動車輛用 儀表及。P件、自動啟閉門窗或其他自動控制設備等，無論 型態為何1都展現比傳統馬達更精確優秀的效能。如圖^ 所不美國冑6’043’574號專利之内轉子步進馬達，其定子 具有複數呈「M」型之鐵;12、14，在「M」型鐵芯 12 14之中央柱122、U2上套設線圈組124、144，當致 能線圈組丨44肖，中央柱142接近永磁轉子16端會形成 15 例如一 N磁極，磁力線並經由矽鋼材質之鐵芯μ，在左 右兩絲M6、m面向轉子16端形成相反的s極從而 吸引或排斥轉子16上的對應磁極’驅動轉子16繞樞軸旋 轉。而各「M」型鐵芯12、14設置之夹角，則需與永磁 式轉子16的磁極錯開，亦即，當鐵芯】4正對轉子之一磁 20 極時，另-Μ 12則並未正對轉子之任一磁極，而是面 向磁極間之緩衝區。 但如圖2所示，由於定子實際具有八處突出部，各突 出部間隔45度，而轉子具有十個磁極，各磁極間距為％ 度，因此，中央柱⑷與帅丨46、丨48之間距其實略大 於轉子之磁極間距，並未完全對應；亦即當「M」型鐵 5 1342654 芯14之中央4主1 42對準轉子磁極時，磁靴1 46、1 48分別 偏離對應轉子磁極9度，更向外側的鐵芯12及外加定子 磁軛，則分別偏離1 8度（恰位於兩轉子磁極間）、及9度， 由於各定子磁軛均非正對轉子磁極，不僅分別使能量運用 效率被大打折扣，而且所導引出的磁力將產生不必要的側 向分量。依照上述结構，當轉子磁極磁力達9〇0 Gauss， 驅動電流為30安培時，其轉矩為3 56χ1〇-6 mN m。 10 為切合以上需求，本新型創作人另申請第962〇 1 295 號新型專利如圖3所示，該新型揭露定子具兩輔助磁軛部 之步進馬達，主要包含一轉子22及一定+ 2。在該新型 創作中，轉子22係選擇一 18極轉子’其N、s磁極兩兩 間隔地沿一樞軸放射狀設置於面向轉子22外側，因此在 圖式及計算過裎中，每—磁極約佔2(Γ(36〇·/丨8 = 卜 15 該例之定子2設置有兩主磁軛部“ '兩輔助磁軛部 Μ及一高磁阻段24,主磁軛部％與輔助磁軛部μ的相 互關係為主磁㈣26與轉子框轴2G之連線，及輔助磁抚 部28與轉子樞轴2G連線夾—純角；兩主磁_26對應 轉子22之磁極不同，當主磁軛部％之一對應轉子2則 20 s極時’另-主磁_26則對應轉子22之^§極間之 緩衝區。依照該案之揭露，不僅同一 鉍此如a门* ，且之主磁麵部與輔助 軸部會㈣正對料賴，使料能利 :輔助縣部處，捕捉利用主魏部致能磁極逸散:磁力 線，輔助增加磁能之運用效率· 邛“ 羊尤其輔助磁軛部與主磁軛 ㈣夹一純角’有效減少轉子之偏振，讓轉子抱轴相關零 6 13426549. The invention relates to: [Technical Field] The present invention relates to a stepping motor, and more particularly to a stepping motor in which a stator has a pair of auxiliary magnetic poles at a distal end. [Prior Art] 10 Stepping horses have been widely used in many fields due to their ability to be programmed and precision controlled, such as transaction machines, precision machinery, and instrumentation for motor vehicles. P-pieces, automatic opening and closing doors and windows or other automatic control devices, regardless of the type 1 show more accurate and superior performance than traditional motors. The rotor stepping motor of the U.S. Patent No. 6'043'574 has a stator having a plurality of "M" type irons; 12, 14 and a central column 122 of the "M" type core 12 14; The coil set 124, 144 is sleeved on the U2. When the coil set 丨44 is enabled, the central column 142 is close to the end of the permanent magnet rotor 16 to form 15, for example, an N magnetic pole, and the magnetic field line is connected to the iron core μ of the steel material. The wires M6, m face the rotor 16 end to form opposite s poles to attract or repel the corresponding poles on the rotor 16 to drive the rotor 16 about pivoting. The angle between the "M" cores 12, 14 is offset from the magnetic pole of the permanent magnet rotor 16, that is, when the core 4 is opposite the magnetic pole of the rotor, the other is 12 It is not facing any of the magnetic poles of the rotor, but faces the buffer between the magnetic poles. However, as shown in FIG. 2, since the stator actually has eight protrusions, each protrusion is separated by 45 degrees, and the rotor has ten magnetic poles, and the magnetic poles are spaced by a degree, so that the central column (4) and the handsome 46, the 丨48 The spacing is actually slightly larger than the pole spacing of the rotor, which does not correspond exactly; that is, when the center 4 main 1 42 of the core 14 of the "M" type iron 5 1342654 is aligned with the rotor pole, the magnetic shoes 1 46, 1 48 are respectively offset from the corresponding rotor poles. 9 degrees, the outer core 12 and the external stator yoke are respectively offset by 18 degrees (just between the two rotor poles) and 9 degrees. Since each stator yoke is not facing the rotor magnetic pole, not only The efficiency of energy use is greatly compromised, and the magnetic force that is directed will produce unwanted lateral components. According to the above structure, when the magnetic force of the rotor magnetic pole reaches 9 〇 0 Gauss and the driving current is 30 amps, the torque is 3 56 χ 1 〇 -6 mN m. In order to meet the above requirements, the creator of the present invention additionally applies the new patent No. 962〇1 295 as shown in FIG. 3, which discloses a stepping motor having two auxiliary yoke portions of a stator, mainly comprising a rotor 22 and a certain + 2 . In the novel creation, the rotor 22 selects an 18-pole rotor whose N and s magnetic poles are radially spaced apart from each other toward the outside of the rotor 22 in a pivotal manner. Therefore, in the drawings and the calculated turns, each magnetic pole Approx. 2 (Γ (36〇·/丨8 = 卜15) The stator 2 of this example is provided with two main yoke sections "'two auxiliary yoke sections Μ and one high magnetoresistive section 24, the main yoke section % and auxiliary The relationship between the yoke portions μ is the connection between the main magnetic (four) 26 and the rotor frame shaft 2G, and the auxiliary magnetic contact portion 28 and the rotor pivot 2G are connected to each other - a pure angle; the two main magnetic _26 are different from the magnetic poles of the rotor 22, When one of the main yoke portions corresponds to the rotor 2 and then 20 s poles, the other-main magnet _26 corresponds to the buffer between the poles of the rotor 22. According to the disclosure of the case, not only the same as the door* And the main magnetic face and the auxiliary shaft will be (4) facing the material, so that the material can benefit: assist the county department, capture the use of the main Wei Department to enable the magnetic pole escape: magnetic lines, help increase the efficiency of magnetic energy utilization 邛The sheep, especially the auxiliary yoke part and the main yoke (four) clip a pure angle 'effectively reduce the polarization of the rotor, let the rotor hold the axis related to zero 6 1342654
件壽命得以延長。 然而，當步進馬達體積逐漸微型化，轉子及定子尺寸 都需減小，每一轉子磁極所對應之弧長隨之縮短，亦即’， 當主磁耗部係由一本體及一絲所構成時，本體及磁轨間 5距亦隨之減小，若仍想維持原有之線圈尺寸，將在製造方 面產生困擾，但減少匝數勢必削弱磁力。 因此，在不縮減線圈尺寸前提下，主磁軛部之結構必 須作變更，才能容許維持原尺寸之線圈順利套入本體 中’且輔助磁輕部亦有些許變化，以提供減振效果，延 1〇 產品壽命。 【發明内容】 因此，本發明之—目的，在提供—種擴大主磁極與輔 助磁極間距比例，容許整體體積能更微型化的步進馬達。 本發月之另一目的，在提供一種藉由輔助磁極與轉子 15磁極之感應，減低偏心振動、使運轉更寧靜的步進馬達。 本發月之再一目的，在提供一種可減少振動摩擦提 升能量運用效能的步進馬達。 w本發月之又一目的，在提供一種減少樞軸相關部件無 謂磨耗，運作年限得以延長的步進馬達。 … 2〇八^發明的定子具遠端成對輔助磁極之步進馬達，包 2㈣供沿軸旋轉之轉子，具有複數沿該㈣徑向設 子表面、且相㈣職相反之磁極，各該磁極間距 ::專，-與該轉子共圓心且間隔一氣隙之定子，包括：二 、有本體、及一套設於該本體之線圈組的主磁極； 7 1342654 年月曰修正替換頁 PQ Λ - 0 1〇- 及二分別對應該等主磁極、並與該等主磁極夹一對應奇數 轉子磁極間距之近主磁極輔助磁極；及二分別與該近主磁 極輔助磁極成對配置、並夾對應一轉子磁極間距之遠主磁 極輔助磁極。 藉由成對輔助磁極的配置，不僅使磁能得以充分利 用’且在成對輔助磁極可與轉子磁極間相互感應吸引，此 吸引力與主磁極合力矩相加乘、合力相抵銷狀況下，可降 低耗能、提升轉子旋轉效率、且在未致能時增加轉子穩定 性；反之，可減少偏斜吸引力，降低振動耗能及隨之而來 10 對於軸承部分之摩擦；另因定子内部空間配置’使微型步 進馬達之線圈組的安裝更加順暢，充分達到發明的目的。 【實施方式】 15 有關本發明之技術内容、特點與功效，配合下列參考 圖式所示較佳實施例及其詳細說明，將可清楚的呈現。此 外在各實施例中，相同之元件將以相似之標號標示。 20 如圖4所不，本發明揭露之定子具遠端成對輔助磁極 之步進馬達’主要包含-轉子3及—定子5,兩者以氣隙 4相隔且共圓心。本實施例中，轉子3以一丨2磁極轉子 為例，其Ν、S磁極兩兩間隔地沿一柩軸放射狀設置於面 向轉子3外側，因此在圖式中，每一磁極約佔3〇 ; (36〇。 /12=30 ·)。 本案之定子具兩本體5〇、兩成對輔助磁極及一高磁 =段6 ’ @本體50各套置有線圈组52以提供致能能量， 藉此形成兩主磁極54’成對之輔助磁極則因與主磁極54 8 1342654 ；The life of the piece is extended. However, when the stepping motor volume is gradually miniaturized, the size of the rotor and the stator need to be reduced, and the arc length corresponding to each rotor magnetic pole is shortened, that is, when the main magnetic consumption portion is composed of a body and a wire. At the same time, the distance between the body and the track is also reduced. If you still want to maintain the original coil size, it will cause trouble in manufacturing, but reducing the number of turns will weaken the magnetic force. Therefore, under the premise of not reducing the size of the coil, the structure of the main yoke portion must be changed to allow the coil of the original size to be smoothly inserted into the body, and the auxiliary magnetic light portion is also slightly changed to provide a vibration damping effect. 1〇 Product life. SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a stepping motor that expands the ratio of the distance between the main magnetic pole and the auxiliary magnetic pole, thereby allowing the overall volume to be more miniaturized. Another object of the present month is to provide a stepping motor that reduces the eccentric vibration and makes the operation quieter by the induction of the magnetic poles of the auxiliary magnetic poles and the rotor 15. A further object of the present month is to provide a stepping motor that can reduce the vibration friction and increase the energy utilization efficiency. Another purpose of this month is to provide a stepper motor that reduces the unnecessary wear of the pivot-related components and extends the operating life. The stator of the invention has a stepping motor with a pair of auxiliary magnetic poles at the distal end, and a rotor (2) for rotating the shaft along the axis, having a plurality of magnetic poles along the radial surface of the (four) radial direction, and Pole spacing:: special, - a stator that is concentric with the rotor and spaced apart by an air gap, comprising: two, a main body, and a set of main magnetic poles disposed on the coil group of the main body; 7 1342654 曰 曰 correction replacement page PQ Λ - 0 1 〇 - and 2 respectively correspond to the main magnetic poles, and the main magnetic poles of the main magnetic poles are adjacent to the main magnetic pole auxiliary magnetic poles; and the two are respectively arranged in pairs with the near main magnetic pole auxiliary magnetic poles The far main magnetic pole auxiliary magnetic pole corresponding to a rotor pole pitch. By the arrangement of the pair of auxiliary magnetic poles, not only the magnetic energy can be fully utilized, but also the pair of auxiliary magnetic poles can be inductively attracted to the magnetic poles of the rotor, and the attraction force is multiplied by the main magnetic moment and the resultant force is offset. It can reduce energy consumption, improve rotor rotation efficiency, and increase rotor stability when not enabled; on the contrary, it can reduce the deflection attractive force, reduce the vibration energy consumption and the subsequent friction to the bearing part; The space configuration makes the installation of the coil set of the micro stepping motor smoother and fully achieves the purpose of the invention. [Embodiment] The technical contents, features and effects of the present invention will be apparent from the following description of the preferred embodiments and the detailed description. In the various embodiments, the same elements will be designated by like reference numerals. 20, as shown in Fig. 4, the stepping motor 'of the distal end paired auxiliary magnetic poles of the present invention mainly comprises a rotor 3 and a stator 5, which are separated by an air gap 4 and are concentric. In the present embodiment, the rotor 3 is exemplified by a 磁2 magnetic pole rotor, and the Ν and S magnetic poles are radially disposed on the outer side of the rotor 3 along a 柩 axis, so in the figure, each magnetic pole occupies about 3 〇; (36〇. /12=30 ·). The stator of the present case has two bodies 5〇, two pairs of auxiliary magnetic poles and one high magnetic=segment 6 '@body 50 each sleeved with a coil assembly 52 to provide energizing energy, thereby forming two main magnetic poles 54' in pairs. The magnetic pole is due to the main magnetic pole 54 8 1342654;
I ^ π曰換K L^：-.9 ίχΓ .__] 之位置關係分別有近主磁極輔助磁極56及遠主磁極輔助 磁極58，主磁極54與遠主磁極輔助磁極58的相互關係 為主磁極54與轉子樞軸3〇之連線，及遠主磁極輔助磁極 5 8與轉子樞軸3〇連線夾一鈍角；兩主磁極54對應轉子 5磁極32不同步，例如當主磁極54之一對應轉子3的N或 S極時’另一主磁極則對應轉子3之N與s極間之緩衝區， 藉此在輪流致能兩線圈組52時，轉子3得以順利轉動， 高磁阻段6之於定子5製作時成形，形成減少磁能逸散之 空氣空間。 1〇 如圖5所示，致能線圈組52所生之磁力線，主要分 佈如粗虛線55所示，會在主磁極54處產生對於轉子磁極 之強大吸引力’從而造成如圖6所示偏向之吸引力f 1。 但當設置有本發明中之成對輔助磁極56、58後，輔助吸 引轉子磁極32 ’從而感應產生如同細虛線57所示磁力線 15刀佈，因而分布於定子5周圍及成對之輔助磁極迴路。依 照圖2之相同環境條件下進行實驗，此時，轉子磁極仍為 900 Gauss，流經線圈之電流亦為3〇安培，此時之轉矩升 高為5.86xl0·6 mN_m，明顯較圖2結構提升約6〇%。 經由本案結構，轉子除受原磁力F丨之吸引；面對成 2〇對輔助磁極之轉子磁極32亦受近主磁極輔助磁極56、及 遠主磁極輔助磁極58之合力吸力F2吸引，兩吸引力之合 力為F3;由於「主磁極與轉子樞軸連線」和「遠主磁極 輔助磁極與轉子樞軸連線」之夾角0為鈍角，使得？2會 存在與F1相抵銷之反向分量，合力F3因而小於原本 9 9年， 此即意謂，由合力所诘忐 動 立 成之轉子單方向磁吸情況減輕，振 動及噪音減小、軸承磨耗減 我味馬達哥命從而增長。 另方面，由於F丨所 .,,., 成之力矩與F2所造成之力矩同 方向（例如均為順時針方 向），&力矩因而增大，超過原本 F1所造成之力矩，即僅 t 吏致此之旎置大小相同，轉子轉動 仍因而更有效率。 為更進-步驗證上述實施例之構思，本發明創作人分 別以傳統無輔助磁極之步進馬達、及本創作具成對輔助磁The positional relationship of I ^ π 曰 KL^:-.9 ίχΓ .__] has a near main magnetic pole auxiliary magnetic pole 56 and a far main magnetic pole auxiliary magnetic pole 58, respectively, and the relationship between the main magnetic pole 54 and the far main magnetic pole auxiliary magnetic pole 58 is a main magnetic pole. 54 is connected to the rotor pivot 3〇, and the far main magnetic pole auxiliary magnetic pole 58 and the rotor pivot 3〇 are connected with an obtuse angle; the two main magnetic poles 54 are not synchronized with the rotor 5 magnetic pole 32, for example, when the main magnetic pole 54 Corresponding to the N or S pole of the rotor 3, the other main magnetic pole corresponds to the buffer between the N and s poles of the rotor 3, whereby the rotor 3 can be smoothly rotated when the two coil groups 52 are alternately enabled, and the high magnetoresistive section 6 is formed during the fabrication of the stator 5 to form an air space that reduces magnetic energy dissipation. 1〇, as shown in FIG. 5, the magnetic lines of force generated by the enabling coil group 52, mainly distributed as indicated by the thick broken line 55, will produce a strong attraction to the rotor magnetic pole at the main magnetic pole 54, resulting in a deflection as shown in FIG. The attraction f 1. However, when the pair of auxiliary magnetic poles 56, 58 in the present invention are provided, the auxiliary attracting rotor magnetic poles 32' are induced to generate magnetic fluxes 15 as shown by the thin broken lines 57, and thus distributed around the stator 5 and in pairs of auxiliary magnetic pole circuits. . Experiments were carried out under the same environmental conditions as in Fig. 2. At this time, the rotor magnetic pole was still 900 Gauss, and the current flowing through the coil was also 3 amps. At this time, the torque rise was 5.86xl0·6 mN_m, which is significantly better than Fig. 2. The structure is improved by about 6〇%. According to the structure of the present invention, the rotor is attracted by the original magnetic force F丨; the rotor magnetic pole 32 facing the auxiliary magnetic pole is also attracted by the close main magnetic pole auxiliary magnetic pole 56 and the combined force of the far main magnetic pole auxiliary magnetic pole F2, two attracting The resultant force is F3; because the angle between the "main magnetic pole and rotor pivot connection" and the "far main magnetic pole auxiliary magnetic pole and rotor pivot connection" is an obtuse angle, so that? 2 There will be a reverse component offset with F1, and the resultant force F3 is thus smaller than the original 9-9 years. This means that the single-direction magnetic attraction of the rotor that is mobilized by the combined force is reduced, the vibration and noise are reduced, and the bearing The wear and tear reduced my taste of the motor and grew. On the other hand, because F丨,.,., and the torque generated by F2 are in the same direction as the torque caused by F2 (for example, both are clockwise), the & moment is increased, which exceeds the torque caused by the original F1, that is, only t As a result, the size of the device is the same, and the rotation of the rotor is still more efficient. In order to further verify the concept of the above embodiment, the creators of the present invention use a conventional stepper motor without an auxiliary magnetic pole, and a pair of auxiliary magnetics of the present invention.
極之步進馬達兩個模纟且；f=f八4«=· X 、，進仃刀析，分別以通電、不通電狀 15 况取付X Y、z二轴向之力矩量。數據顯示，在無輔助 磁極狀況下，即便改選擇轉子磁極為1100 Gauss者，並維 持定子線_之電流為3G安培，由F1所造成之轉矩仍僅有 3·93χΗΓό mN_m ’與本案結構所造成之合力矩相較，僅為 本案結構67%效能。亦即，依照本案揭露，有輔助磁極的 步進馬達表現確實優於傳統步進馬達或沒有輔助磁極 者。另在兩者處於未通電狀況時’ z軸取得之數據亦顯示 本發明創作具有可更有效保持轉子位置之優勢。 20 此外，因主磁極54與漆遠主磁極輔助磁極58之相對 間隔擴大’使得線圈組52可輕易於步進馬達製程中，以 自動化機具套設安裝於本體50上，絲毫不受定子尺寸微 型化之干擾’使步進馬達的微型化更進一步實現。 本發明之結構除適用於如上述實施例之具12磁極之 轉子’亦能將概念應用於多磁極轉子之步進馬達，如圖7 所示之本發明實施例二’定子5’設置在轉子3,外側，兩者 10 1342654 年j·] F]修正待換Η --- 間隔一氣隙4’ ’定子5,具有兩本體50’及一高磁阻段6,， 本體50’套設有線圈組52，，轉子3,具有二十個交錯磁極， 兩主磁極54’所對應之轉子磁極32,不同，當—主磁極54· 對應轉子磁極32’之一時，另一主磁極則對應轉子磁極32, 5之緩衝區；主磁極54’與遠主磁極輔助磁極58，維持失一鈍 角’藉以有效利用輔助磁極受轉子磁極感應之吸引力以 減少偏心之合力，從而減弱轉子之偏振旋轉。 s然，如熟於此技者所能輕易理解，本發明之結構並 非侷限於内轉子馬達1亦可輕易轉換至外轉子馬達，故如 10圖8所示，定子5”設置在外轉子3”中，兩者間隔一氣隙 4 ，定子5”具有兩本體5〇”及一高磁阻段6”，兩線圈組 52”各自套設於本體5〇 ”之上提供致能能量，外轉子具 有十二個交錯磁極，兩主磁極54，，所對應之外轉子磁極32” 不同，當一主磁極54”對應外轉子磁極32”時，另一主磁 15極則對應外轉子磁極32”之緩衝區；主磁極54”與遠主磁 極輔助磁極58”仍維持夾一鈍角，藉以有效減少偏心之合 力、及所造成之振動與磨耗。 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 20把圍及發明說明書内容所作之簡單的等效變化與修飾，皆 應仍屬本發明專利涵蓋之範圍内。 1342654 【圖式簡單說明】 圖1是美國第6,043,574號專利之步進馬達一較佳實 施例俯視示意圖； 圖2是圖1步進馬達實施例之磁力線分佈示意圖； 5 圖3是本案創作人另一創作之步進馬達俯視示意圖； 圖4是本發明第一較佳實施例之步進馬達俯視示意 圖，說明定子、各磁極與轉子之關係； 圖5是圖4實施例磁漏磁力線示意圖； 圖6是圖4實施例之磁力合力示意圖； 10 圖7是本案第二較佳實施例之俯視示意圖；及 圖8是本案第三較佳實施例之俯視示意圖。 12 1342654 曰修正頁I 一切________i 【主要元件符號說明】 2、10、5、5’、5’’...定子 122、142…中央柱 124、144、52、52’、52，，···線圈組 5 146、148·.·磁 lit 16、22、3、3’、3，，.·.轉子 12、14...鐵芯 20、30…樞軸 24、6、6’、6”…高磁阻段 10 26...主磁軛部 28.. .輔助磁軛部 32 ' 32’、32”…轉子磁極 4、4’、4，，…氣隙 50、50’、50，，…本體 15 54、54’、54’’··.主磁極 5 5、5 7…磁力線 56.. .近主磁極輔助磁極 58、58’、58”…遠主磁極輔助磁極 F1 〜F3...力 13The stepping motor of the pole is two modules; f=f eight 4«=· X, and the knife is analyzed, and the torque of the two axial directions of X Y and z is taken in the condition of energization and non-energization. The data shows that in the absence of auxiliary magnetic poles, even if the rotor magnetic pole is changed to 1100 Gauss, and the current of the stator wire is maintained at 3G amps, the torque caused by F1 is still only 3.93 χΗΓό mN_m 'and the structure of the case Compared with the resultant torque, it is only 67% of the structure of the case. That is, according to the present disclosure, the stepping motor having the auxiliary magnetic pole performs better than the conventional stepping motor or the auxiliary magnetic pole. The data obtained by the 'z-axis' when the two are in an unpowered state also shows that the inventive creation has the advantage of more effectively maintaining the rotor position. In addition, because the relative spacing between the main magnetic pole 54 and the varnish main magnetic pole auxiliary magnetic pole 58 is expanded, the coil assembly 52 can be easily mounted on the body 50 in an automated machine tool in a stepping motor process, and is not subject to the stator size. The interference of 'making the miniaturization of the stepping motor further. The structure of the present invention can be applied to a stepping motor of a multi-pole rotor in addition to the rotor having 12 poles as in the above embodiment, and the stator 2' of the second embodiment of the present invention is disposed on the rotor as shown in FIG. 3, outside, both 10 1342654 j ·] F] modified to be replaced --- interval one air gap 4 ' 'status 5, has two bodies 50' and a high reluctance section 6, the body 50' is sleeved The coil assembly 52, the rotor 3, has twenty staggered magnetic poles, and the rotor magnetic poles 32 corresponding to the two main magnetic poles 54'. When the main magnetic pole 54· corresponds to one of the rotor magnetic poles 32', the other main magnetic pole corresponds to the rotor. The magnetic poles 32, 5 are buffered; the main magnetic pole 54' and the far main magnetic pole auxiliary magnetic pole 58 are maintained at an obtuse angle 'to effectively utilize the attractive magnetic pole to be attracted by the rotor magnetic pole to reduce the resultant force of the eccentricity, thereby weakening the polarization rotation of the rotor. However, as will be readily understood by those skilled in the art, the structure of the present invention is not limited to the inner rotor motor 1 and can be easily switched to the outer rotor motor. Therefore, as shown in FIG. 10, the stator 5" is disposed on the outer rotor 3". Wherein, the two are separated by an air gap 4, the stator 5" has two bodies 5"" and a high magnetoresistive section 6", and the two coil sets 52" are respectively disposed on the body 5"" to provide energetic energy, and the outer rotor has The twelve staggered magnetic poles, the two main magnetic poles 54, are different from the outer rotor magnetic poles 32". When one main magnetic pole 54" corresponds to the outer rotor magnetic pole 32", the other main magnetic pole 15 corresponds to the outer rotor magnetic pole 32" The buffer zone; the main magnetic pole 54" and the far main magnetic pole auxiliary magnetic pole 58" still maintain an obtuse angle, thereby effectively reducing the combined force of the eccentricity and the vibration and wear caused. However, the above is only a preferred implementation of the present invention. It is to be understood that the scope of the invention is not limited thereto, that is, the equivalent equivalents and modifications of the invention and the scope of the invention are still within the scope of the invention. 1342654 BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a top plan view of a preferred embodiment of a stepping motor of US Pat. No. 6,043,574; FIG. 2 is a schematic view showing the distribution of magnetic lines of a stepping motor of FIG. 1; Figure 4 is a top plan view of the stepping motor of the first preferred embodiment of the present invention, illustrating the relationship between the stator, the magnetic poles and the rotor; Figure 5 is a schematic view of the magnetic leakage magnetic line of the embodiment of Figure 4; Figure 6 is Figure 4 FIG. 7 is a top plan view of a second preferred embodiment of the present invention; and FIG. 8 is a top plan view of a third preferred embodiment of the present invention. 12 1342654 曰Revised Page I All ________i [Main Component Symbols Description] 2, 10, 5, 5', 5''... stator 122, 142... center column 124, 144, 52, 52', 52, ... coil group 5 146, 148 ·. 16, 22, 3, 3', 3, ... Rotor 12, 14... Iron core 20, 30... Pivot 24, 6, 6', 6"... High reluctance section 10 26... Main Yoke portion 28.. auxiliary yoke portion 32' 32', 32"... rotor poles 4, 4', 4, ..., air gaps 50, 50', 50 , ... body 15 54, 54', 54''.. main magnetic pole 5 5, 5 7 ... magnetic field line 56.. near the main magnetic pole auxiliary magnetic poles 58, 58 ', 58" ... far main magnetic pole auxiliary magnetic poles F1 ~ F3. ..力13