1290787 (1) 玖、發明說明 【發明所屬之技術領域】 本發明是關於一種具有位於定子的外周圍而環狀地排 列複數磁極的外轉型外轉型永久磁鐵電動機的轉子。 【先前技術】 習知，作爲外轉型永久磁鐵電動機（outer rotar permanent magnet motor)的轉子，使用表示於第l〇圖及 第U圖者。該者是將圓形主板部1 a與位於該主板部的周圍 的環狀周側壁1 b以鐵板等磁性體所形成的機架1的內周部 (周側壁1 b的內側），作成藉由僅磁極數配置永久磁鐵2 而環狀地排列複數磁極3的構成，一方面，在機架1的外周 部（周側壁1 b的外側），配置以相同磁性體所形成的環構 件4，又，藉由合成樹脂5—體地結合此等所成者，永久磁 鐵2 (磁極3 )位於未圖示的定子的外周面，形成能旋轉的 狀態[例如參照日本專利公報第3 0 1 795 3號（第3頁，第1圖 〜第3圖）]。 上述習知者的情形，在其製造上採用表示於第1 2圖的 方法。亦即，成形模6在由下模6a與覆蓋該下模的上模6b 所形成的構成，在該下模6a配合永久磁鐵2的形狀及個數 形成的複數凹部7分別插入環狀地配置永久磁鐵2，而由該 上面覆蓋機架1，又在該外周放置環構件。又，對於此等 ，覆蓋上模6b經鎖緊模之後，將合成樹脂以熔融狀態塡充 於上模6b及下模6a間的模腔8。如此，在該合成樹脂5硬化 1290787 (3) 效地及於定子。 這時候’形成鐵心磁極的部分的內周部，是與定子之 間的氣隙朝周方向成爲不均勻的形狀較理想（申請專利範圍 第2項的發明）。 依照該者’可將轉子與定子之間的氣隙的磁通密度的 分布，作成減少轉矩紋波者。 又，在形成鐵心磁極的部分之間，具有由鐵心的徑向 最大寬度的中心至外周側的深度的谷部較理想（申請專利範 圍第3項的發明）。 依照該者，藉由谷部可阻止相鄰接的永久磁鐵間的磁 通短路，而可將磁通流動作成優異。 又，合成樹脂具有成形於形成鐵心的磁極的部分之間 較理想（申請專利範圍第4項的發明）。 依照該者，使得依合成樹脂的機架，及鐵心，及永久 磁鐵的結合更牢固。 又，鐵心的穴，在插入於該穴的永久磁鐵的側方有保 留經上述合成樹脂所塡充的空間的段差較理想（申請專利 範圍第5項的發明）。 依照該者，固定於鐵心的穴的永久磁鐵，能充分地確 保並牢固合成樹脂的通路。 1290787 (4) 又，鐵心，在穴的外周側具有連通經上述合成樹脂被 塡充的凹缺部較理想（申請專利範圍第6項的發明）。 依照該者，固定於鐵心的穴的永久磁鐵’藉由塡充於 穴的外周側的凹缺部的合成樹脂可將永久磁鐵確實地靠近 穴的內周側。 又，鐵心的從穴至外周側的尺寸比從穴至內周側的尺 寸較大較理想（申請專利範圍第7項的發明）。 依照該者，可將從鐵心的穴至外周側的磁通的流動成 爲良好。 又，鐵心是組合分割複數所形成的單位鐵心所構成較 理想（申請專利範圍第8項的發明）。 依照該者，藉由磁阻在單位鐵心的接縫變大，使得磁 力在該部分比其他部分較小，而使轉子的旋轉在該部分變 慢。依照比，在反饋控制的電動機中，爲了使其旋轉變快 ’電流，電壓値均變大，因此，藉由測定該變大的電流， 電壓値，成爲可檢測轉子的旋轉位置，並可檢測旋轉負荷 的旋轉位置。 【實施方式】 以下，參照第1圖至第8圖說明本發明第〗實施例。 首先’在第4圖表示外轉型永久磁鐵電動機的定子！ j ’該定子主要由鐵心1 2與線圈1 3所構成。 其中’鐵心1 2是例如疊層沖孔成所定形狀的磁性體的 多數枚的鋼板所構成者；具有呈環狀的軛部丨2a，及從該 - 9- 1290787 (5) 軛部的外周部放射狀地突出的多數齒部1 2 b，而在該大約 整體外面模成形設置電氣絕緣材的合成樹脂所構成的被覆 構件1 4。又，在該被覆構件1 3，於內周部形成複數個安裝 部1 5 ’由此，將定子1 1安裝於洗衣機等所需機器的電動機 安裝部。又，在各齒部1 2 b，於被覆構件1 4的各外周繞裝 線圈1 3，藉由以上來構成定子1 1。 對此，在第6圖及第7圖，及第1圖至第3圖，表示外轉 型永久磁鐵電動機的轉子1 6，此爲主要由機架1 7與鐵心1 8 及永久磁鐵1 9所構成。其中，機架1 7是藉由壓製加工磁性 體的如鐵板所形成者；如第5圖所示地，其有在中心部具 有軸支持體形成孔20的圓形主板部17a，及從該主板部17a 的外周部垂下的環狀周側壁1 7的形成扁平有蓋圓筒狀。 在上述主板部1 7a的外周部全周又形成段差部2 1，上 述鐵心1 8是如第6圖所示地，設於機架1 7的周圍部，惟詳 細地，這時候，如第2圖所示地，配置在段差部2 1與上述 周側壁1 7 b所圍繞的空間，成爲段差部2 1的內周緣與鐵心 1 8的內周位於大致同一面。又在段差部2 1，將表示於第3 圖的孔22形成複數於整體全周，又，在主板部17a的段差 部2 1與上述軸支持體形成孔2 0之間的部分’如第5圖及第6 圖所示地，以環狀配置形成複數通風孔23。 這時候，上述鐵心1 8是藉由疊層大約圓環狀地沖孔的 磁性體的如多數枚鐵板所構成者’在該鐵心1 8的形成複數 磁極2 4的部分，分別形成穴2 5。該穴2 5是如第2圖所不地 ，從鐵心]8的下端面一直達到上端面附近的深度者’如第 -10- 1290787 (6) 1圖所示地，將朝鐵心1 8的切線方向較長的矩形幅窄部2 5 a 具有於內周側，而將以相同矩形且較幅廣的幅廣部2 5 b具 有於外周側的所謂兩段形狀者，該段差26存在於幅窄部 2 5 a與幅廣部2 5 b之兩側部間。 又，在穴2 5的外周側（幅廣部2 5 b的外周側），於中 央部，形成有與穴25連通的半圓筒形的凹缺部27。又’在 形成鐵心1 8的磁極2 4的部分的各間，將軸向地貫通鐵心1 8 的貫通孔2 8，形成位於由鐵心1 8的徑方向最大寬度W的中 心〇至外周側，同時如第3圖所示地，將從鐵心1 8的內珣 側至谷部2 9，形成由鐵心1 8的徑向最大寬度W的中心Ο蕙 達到外周側的深度。 此外，形成鐵心18的磁極24的部分的內周部30，是與 對向於此的上述定子1 1之間的氣隙在周方向成爲不均勻的 形狀，又，鐵心1 8的從穴2 5至外周側的尺寸B形成比上述 穴2 5至內周側的尺寸A更大。 對於以上，永久磁鐵1 9是形成矩形平板狀者，將此分 別插入在上述鐵心1 8的穴25，特別是分別插入在幅窄部 25a。結果，穴25是以永久磁鐵19分別塡滿所有幅窄部25a ，而在幅廣部2 5 b的兩側部（所插入的永久磁鐵1 9的兩側 方）保留著空間3 1。又，永久磁鐵1 9是朝厚度方向被磁化 ，該磁力是作成大約23 7 0 [河八/111][參考値：30(^4(^)]以 上的高能積。 在第8圖表示使用於製造上述轉子1 6的成形模3 2，該 成形模32是由下模32a與覆蓋該下模的上模32b所構成。將 上述永久磁鐵1 9插入在穴2 5的鐵心1 8，是放在下模3 2 a的 -11 - (7) 1290787 凸部33的外周，從上方覆蓋機架17，再覆蓋上模32b之後 進行鎖模。然後，將合成樹脂35以熔融狀態塡充於上模 32b及下模32間的模腔34。 如此，合成樹脂3 5如第3圖所示地經鐵心1 8的貫通孔 2 8而被塡充於該孔，同時被塡充於鐵心1 8與機架1 7的段差 部2 1之間而經過孔2 2，位於機架1 7的外部被成形。因此， 鐵心18的貫通孔28是功能作爲合成樹脂35經過並被塡充的 通路。 又，這時候，如第1圖所示地，合成樹脂3 5是被注入 並塡充在鐵心1 8的插入永久磁鐵1 9的穴2 5內，特別是也注 入並塡充在該幅廣部25b，這時候，幅廣部25b的兩側部（ 永久磁鐵1 9的兩側方）的空間3 1，同樣功能作爲合成樹脂 35經過並被塡充的道路。 又，這時候，合成樹脂3 5是也注入在鐵心1 8的凹缺部 2 7並被塡充，由此，鐵心18靠近穴25的內周側（幅窄部 2 5a的內周側）。此外，合成樹脂35是藉由被塡充在谷部 29，如在第1圖及第3圖以成形部36所示地，也塡充在形成 鐵心18的磁極24的部分的各間與下模32a的外周面（與谷 部29的底部側相反之側）之間而被成形，又，如第6圖所 示地，合成樹脂35是一直到機架17的軸支體形成孔20的部 分形成軸支體3 7，同時在軸支持體3 7周圍形成放射狀延伸 的複數肋部3 8。如此，藉由合成樹脂3 5 —體地結合有機架 1 7，及鐵心1 8，及永久磁鐵1 9，來製造轉子。 又，成形模32是在合成樹脂3 5硬化的時機，拆除上模 -12- (8) 1290787 32b，從下模32a取出整體轉子16。又，之後，轉子16是將 來圖示的旋轉軸安裝於上述軸支體3 7，並藉由將該旋轉經 由同樣未圖示的軸承旋轉自如地支持軸承支持具（也未圖 示），使得將永久磁鐵19插入在上述鐵心18的穴25所構成 的複數磁極24成爲環狀地排列而位於定子丨丨的外周圍能進 行旋轉。 如此地依照本構成的外轉型永久磁鐵電動機的轉子1 6 ，永久磁鐵1 9是在製造時，插入在形成於鐵心1 8的穴2 5就 可以，沒有插入於形成在習知的成形模6的凹部7並施以定 位的情形之故，因而不必將該凹部7等形成在成形模3 2， 該分量可簡化成形模3 2，而可得到製品價格的低廉化。 又，本構成者的情形，形成鐵心18的磁極24的部分的 內周部3 0，是作成與定子1 1之間的氣隙在周方向形成不均 勻的形狀，由此，該氣隙的磁阻也在周方向成爲不均勻， 可將該氣隙的磁通密度的分布作成轉矩紋波變少者。其一 種爲，將形成鐵心18的磁極24的部分內周部30形成中高圓 弧面狀的上述構成者的時候，將氣隙的磁阻在內周部3 0的 中央部作成最小，而在兩側部作成較小者，結果，可將該 空隙的磁通密度以波形接近於正弦波，成爲空間高諧波較 少者，因此減少轉矩紋波，而可減低發生振動，噪音。 又，在形成鐵心1 8的磁極24的部分之間，具有比鐵心 18的徑方向最大寬度W的中心Ο達到外周側的深度的谷部 29，由此藉由谷部29可阻止相鄰接的永久磁鐵19間的磁通 短路，而可將磁通流動成爲優異（磁通可流動在相鄰接的 -13- (9) 1290787 永久磁鐵1 9間的外周側）。 又，機架17及鐵心18及永久磁鐵19是以合成樹脂35 — 體地結合，將該合成樹脂3 5通過並塡充的通路的貫通孔2 8 ，具有在比鐵心1 8的徑向最大寬度w的中心0更外周側。 由此，全成樹脂3 5的通路（貫通孔2 8 )，作成不會妨礙相 鄰接的永久磁鐵1 9間的內周側（定子1 1側）的磁通流動， 可將磁力有效地及於定子。 又，將合成樹脂3 5成形具有於形成鐵心1 8的磁極2 4的 部之間（成形部3 6 )。由此，利用合成樹脂3 5的機架1 7與 鐵1 8及永久磁鐵1 9的結合成爲更牢固。 又，鐵心18的穴25是在插入於該穴的永久磁鐵19的側 方有保留合成樹脂35通過所塡充的空間31的段差26。由此 ，固定鐵心18的穴25的永久磁鐵19，能充分地確保合成樹 脂3 5的通路並使之牢固。 又，鐵心18是具有連通合成樹脂35通過被塡充於穴25 的外周側的凹缺部2 7，由此，使得固定鐵心1 8的穴2 5的永 久磁鐵19，藉由塡充於凹缺部27的合成樹脂35可將永久磁 鐵19確實地接近於穴25的內周側。 此外，從鐵心18的穴25至外周側的尺寸B構成比從穴 2 5至內周側的尺寸A較大。由此，可較大地確保從鐵心1 8 的穴2 5至外周側的磁通通路，而可將磁通流動成爲優異。 對於以上，第9圖是表示本發明的第2實施例者，有與 上述第1實施例同一部分賦予同一記號而省略說明，僅說 明不相同部分。 -14- (10) 1290787 在該者中，藉由以接縫4 1所示地組合複數地分割鐵心 18所形成的單位鐵心18a所構成。 在該者中，在單位鐵心1 8 a的接縫4 1使得磁阻變大， 而在該部分使得磁力比其他部分變小。所以，轉子1 1是在 該磁力變小的部分使得旋轉變慢，依據該情形，在反饋控 制的電動機中，使得須其旋轉變快的電流，電壓値變大。 如此，進行測定該變大的電流，電壓値，成爲即可檢測轉 子1 6的旋轉位置，又可檢測旋轉負荷的旋轉位置。 此外，在這時候，藉由單位鐵心1 8 a的大小變小，也 有可將採用鐵心1 8的原材料的材料作成優異的效果。 又，本發明是並不被限定於上述且表示於圖式的各實 施例者，在不超越要旨的範圍內可實施適當變更。 (發明之效果） 如上所述地，依照本發明的外轉型永久磁鐵電動機的 轉子，在成形模不必形成插入永久磁鐵並定位的凹部等之故 ，因而可簡化成形模，具有顯著地得到製品價格之低廉化。 【圖式簡單說明】 第1圖是表示本發明的第1實施例的轉子的主要部分的 橫剖視圖。 第2圖是表示沿著第1圖的X-X線的主要部分的縱剖視 圖。 第3圖是表示沿著第1圖的Y -γ線的主要部分的縱剖視 -15- (11) 1290787 第4圖是表示整體定子的立體圖。 第5圖是表示轉子的機架的立體圖。 第6圖是表示整體轉子的仰視圖。 第7圖是表示轉子的局部立體圖。 第8圖是表示依成形模的轉子的製程的縱剖側視圖。 第9圖是表示本發明的第2實施例的相當於第1圖的圖 第1 〇圖是表示圖示習知例的整體轉子的縱剖視圖。 第11圖是表示相當於第1圖的圖式。 第12圖是表示相當於第8圖的圖式。 主要元件對照表 11 定子 16 轉子 17 機架 18 鐵心 18a 單位鐵心 19 永久磁鐵 24 磁極 25 穴 26 段差 27 凹缺部 28 貫通孔（通路） -16- 谷部 形成鐵心磁極的部分的內周部 空間 成形模 合成樹脂 成形部 單位鐵心的接縫 從鐵心的穴至內周側的尺寸 從鐵心的穴至外周側的尺寸 鐵心徑向最大寬度 鐵心的徑向最大寬度的中心 -17-BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor having an outer-transformed outer permanent magnet motor having a plurality of magnetic poles arranged annularly in an outer periphery of the stator. [Prior Art] Conventionally, as the rotor of the outer rotor permanent magnet motor, the one shown in the first and fourth figures is used. In this case, the circular main plate portion 1 a and the annular peripheral side wall 1 b located around the main plate portion are formed by the inner peripheral portion (the inner side of the peripheral side wall 1 b ) of the frame 1 formed of a magnetic material such as an iron plate. The configuration in which the plurality of magnetic poles 3 are arranged in a ring shape by arranging the permanent magnets 2 only in the number of magnetic poles, on the other hand, the ring members 4 formed of the same magnetic body are disposed on the outer peripheral portion (outside of the peripheral side walls 1b) of the chassis 1. In addition, the permanent magnet 2 (magnetic pole 3) is placed on the outer peripheral surface of the stator (not shown) to form a rotatable state (for example, refer to Japanese Patent Publication No. 3 0 1). 795 No. 3 (page 3, picture 1 to figure 3)]. In the case of the above-mentioned conventional person, the method shown in Fig. 1 is employed in its manufacture. In other words, the forming die 6 is formed by the lower die 6a and the upper die 6b covering the lower die, and the plurality of recesses 7 formed by matching the shape and the number of the permanent magnets 2 in the lower die 6a are inserted into the ring shape. The permanent magnet 2 is covered by the upper frame, and the ring member is placed on the outer circumference. Further, for this, after covering the upper mold 6b via the locking mold, the synthetic resin is melted in the molten state to the cavity 8 between the upper mold 6b and the lower mold 6a. Thus, the synthetic resin 5 hardens 1290787 (3) and acts on the stator. At this time, the inner peripheral portion of the portion where the core pole is formed is preferably a shape in which the air gap between the stator and the stator is uneven in the circumferential direction (the invention of claim 2). According to this, the distribution of the magnetic flux density of the air gap between the rotor and the stator can be made to reduce the torque ripple. Further, between the portions where the core poles are formed, it is preferable to have a valley portion having a depth from the center of the maximum radial width of the core to the outer peripheral side (the invention of claim 3). According to this, the magnetic flux can be made excellent by preventing the magnetic flux short circuit between the adjacent permanent magnets by the valley portion. Further, it is preferable that the synthetic resin is formed between the portions forming the magnetic poles of the core (the invention of claim 4). According to this, the combination of the synthetic resin frame, the core, and the permanent magnet is made stronger. Further, in the hole of the core, it is preferable that the side of the permanent magnet inserted into the hole has a space in which the space filled by the synthetic resin is retained (the invention of claim 5). According to this, the permanent magnet fixed to the hole of the core can sufficiently secure and firmly form the passage of the resin. 1290787 (4) Further, it is preferable that the core has a recessed portion that is filled with the synthetic resin on the outer peripheral side of the hole (the invention of claim 6). According to this, the permanent magnet of the hole fixed to the core can reliably bring the permanent magnet closer to the inner peripheral side of the hole by the synthetic resin which is filled in the concave portion on the outer peripheral side of the hole. Further, the size of the core from the hole to the outer peripheral side is larger than the size from the hole to the inner peripheral side (the invention of claim 7). According to this, the flow of the magnetic flux from the hole of the core to the outer peripheral side can be made good. Further, the core is preferably composed of a unit core formed by combining the plural numbers (the invention of claim 8). According to this, the joint of the magnetic resistance at the unit core becomes large, so that the magnetic force is smaller in this portion than the other portions, and the rotation of the rotor becomes slower in this portion. According to the ratio, in the feedback-controlled motor, in order to make the rotation faster, the voltage 値 becomes larger. Therefore, by measuring the increased current, the voltage 値 becomes the rotational position of the detectable rotor, and can be detected. The rotational position of the rotating load. [Embodiment] Hereinafter, a first embodiment of the present invention will be described with reference to Figs. 1 to 8 . First of all, the figure shows the stator of the externally transformed permanent magnet motor in Figure 4! j' The stator is mainly composed of a core 12 and a coil 13. The core 1 2 is composed of, for example, a plurality of steel sheets laminated and punched into a magnetic body having a predetermined shape; a yoke portion a 2a having a ring shape, and a periphery of the yoke portion from the -9-12290787 (5) A plurality of tooth portions 1 2 b projecting radially are formed, and a covering member 14 made of a synthetic resin provided with an electrical insulating material is molded over the entire outer surface. Further, in the covering member 13, a plurality of mounting portions 15' are formed in the inner peripheral portion, whereby the stator 11 is attached to a motor mounting portion of a machine such as a washing machine. Further, in each of the tooth portions 1 2 b, the coil 1 is wound around each outer circumference of the covering member 14 to form the stator 11 from the above. In this regard, in FIGS. 6 and 7 and FIGS. 1 to 3, the rotor 16 of the externally transformed permanent magnet motor is shown, which is mainly composed of the frame 17 and the core 18 and the permanent magnet 19. Composition. Wherein, the frame 17 is formed by pressing a magnetic body such as an iron plate; as shown in Fig. 5, it has a circular main plate portion 17a having a shaft support forming hole 20 at the center portion, and The annular peripheral side wall 17 which is suspended from the outer peripheral portion of the main plate portion 17a is formed in a flat cylindrical shape. The step portion 2 is formed on the entire circumference of the outer peripheral portion of the main plate portion 17a, and the core 18 is provided at the periphery of the frame 17 as shown in Fig. 6, but in detail, at this time, 2, the space surrounded by the step portion 21 and the peripheral side wall 17b is disposed such that the inner periphery of the step portion 21 is substantially flush with the inner circumference of the core 18. Further, in the step portion 2 1, the hole 22 shown in Fig. 3 is formed in plural in the entire entire circumference, and the portion between the step portion 21 of the main plate portion 17a and the shaft support forming hole 20 is as follows. In the fifth and sixth figures, the plurality of vent holes 23 are formed in a ring shape. At this time, the core 18 is formed by laminating a plurality of iron plates of a magnetic body punched in a ring shape, and a portion of the core 18 is formed with a plurality of magnetic poles 24, respectively, forming a hole 2 5. The hole 25 is as shown in Fig. 2, and the depth from the lower end surface of the core 8 to the vicinity of the upper end surface is as shown in Fig. -10- 1290787 (6) 1 and will be toward the core 18 The rectangular narrow portion 2 5 a having a longer tangential direction has the inner circumference side, and the wide portion 2 5 b having the same rectangular shape and a wider width has a so-called two-stage shape on the outer peripheral side, and the step difference 26 exists in Between the narrow portion 2 5 a and the both sides of the wide portion 2 5 b. Further, on the outer peripheral side of the pocket 25 (the outer peripheral side of the wide portion 2 5 b), a semi-cylindrical recessed portion 27 communicating with the pocket 25 is formed in the central portion. Further, in the portion where the magnetic poles 24 of the cores 18 are formed, the through holes 28 that penetrate the cores 18 in the axial direction are formed so as to be located at the center 〇 to the outer circumference side of the maximum width W in the radial direction of the cores 18. At the same time, as shown in Fig. 3, the center Ο蕙 from the inner side to the valley portion 29 of the core 18 is formed to have a depth from the center Ο蕙 of the radial maximum width W of the core 18 to the outer peripheral side. Further, the inner peripheral portion 30 of the portion where the magnetic poles 24 of the core 18 are formed is a shape in which the air gap between the stators 1 1 opposed thereto is uneven in the circumferential direction, and the pocket 2 of the core 18 is also The dimension B of the outer peripheral side of 5 is formed larger than the dimension A of the above-mentioned pocket 25 to the inner peripheral side. In the above, the permanent magnets 19 are formed into a rectangular flat plate, and are inserted into the holes 25 of the above-mentioned cores 18, in particular, respectively, in the narrow portions 25a. As a result, the pockets 25 are filled with the respective narrow portions 25a by the permanent magnets 19, and the spaces 31 are left on both sides of the wide portions 2 5 b (both sides of the inserted permanent magnets 19). Further, the permanent magnet 19 is magnetized in the thickness direction, and the magnetic force is a high energy product of about 23 7 0 [河八/111] [reference 値: 30 (^4(^)] or more. The forming die 32 of the rotor 16 is formed by a lower die 32a and an upper die 32b covering the lower die. The permanent magnet 19 is inserted into the core 18 of the hole 25. The outer circumference of the -11 - (7) 1290787 convex portion 33 of the lower mold 3 2 a is covered, the frame 17 is covered from above, and the upper mold 32b is covered, and then the mold is clamped. Then, the synthetic resin 35 is fused in the molten state. The cavity 34 between the die 32b and the lower die 32. Thus, the synthetic resin 35 is filled in the hole through the through hole 28 of the core 18 as shown in Fig. 3, and is attached to the core 18 Between the step portion 2 1 of the frame 17 and the hole 2 2, the outside of the frame 17 is formed. Therefore, the through hole 28 of the core 18 functions as a passage through which the synthetic resin 35 passes and is filled. Further, at this time, as shown in Fig. 1, the synthetic resin 35 is injected and filled in the hole 25 of the core 18 which is inserted into the permanent magnet 19, and is also injected in particular. In the wide portion 25b, at this time, the space 3 1 on both sides of the wide portion 25b (the two sides of the permanent magnet 19) functions as a road through which the synthetic resin 35 passes and is filled. At this time, the synthetic resin 35 is also injected into the recessed portion 27 of the core 18 and is filled, whereby the core 18 is close to the inner peripheral side of the pocket 25 (the inner peripheral side of the narrow portion 25a). Further, the synthetic resin 35 is filled in the valley portion 29, as shown by the molding portion 36 in Figs. 1 and 3, and is also interposed between the portions of the magnetic pole 24 forming the core 18 and the lower portion. The outer peripheral surface of the die 32a (the side opposite to the bottom side of the valley portion 29) is formed. Further, as shown in Fig. 6, the synthetic resin 35 is formed into the hole 20 up to the shaft support of the frame 17. Partially forming the shaft support 37, and forming a plurality of radially extending ribs 38 around the shaft support 37. Thus, the frame 17 and the core 18 are integrally coupled by the synthetic resin 35. The permanent magnet 19 is used to manufacture the rotor. Further, the forming die 32 is at the timing of hardening of the synthetic resin 35, and the upper die -12-(8) 1290787 32b is removed from the lower die 32a. After that, the rotor 16 is attached to the shaft support 3 7 by a rotating shaft (not shown), and the bearing support is rotatably supported by a bearing (not shown) (also not As shown in the figure, the plurality of magnetic poles 24 formed by inserting the permanent magnets 19 into the holes 25 of the core 18 are arranged in a ring shape and are rotatable around the outer periphery of the stator turns. The outer permanent magnets according to the present configuration are thus arranged. The rotor 16 of the electric motor and the permanent magnet 19 are inserted into the hole 25 formed in the core 18 at the time of manufacture, and are not inserted into the recess 7 formed in the conventional molding die 6 and are positioned. Therefore, it is not necessary to form the concave portion 7 or the like in the molding die 32, and this component can simplify the molding die 32, and the product price can be reduced. Further, in the case of the present embodiment, the inner peripheral portion 30 of the portion where the magnetic poles 24 of the core 18 are formed is formed such that the air gap between the stator and the stator 1 is uneven in the circumferential direction, whereby the air gap is formed. The magnetic resistance is also uneven in the circumferential direction, and the distribution of the magnetic flux density of the air gap can be reduced as the torque ripple is reduced. When the inner peripheral portion 30 of the magnetic pole 24 forming the core 18 is formed into a medium-high arc-shaped surface, the magnetic resistance of the air gap is minimized in the central portion of the inner peripheral portion 30. As a result, the magnetic flux density of the gap is close to a sine wave, and the space harmonic is less. Therefore, the torque ripple is reduced, and vibration and noise are reduced. Further, between the portions where the magnetic poles 24 of the cores 18 are formed, there is a valley portion 29 which is deeper than the center Ο of the maximum width W of the core 18 in the radial direction, thereby preventing the adjacent portions by the valley portions 29. The magnetic flux between the permanent magnets 19 is short-circuited, and the magnetic flux flow is excellent (the magnetic flux can flow on the outer peripheral side of the adjacent 13-(9) 1290787 permanent magnets 19). Further, the frame 17 and the core 18 and the permanent magnet 19 are integrally connected by the synthetic resin 35, and the through hole 28 of the passage through which the synthetic resin 35 is passed and filled has the largest radial direction than the core 18 The center 0 of the width w is on the outer peripheral side. Thereby, the passage (through hole 28) of the entire resin 35 is formed so as not to interfere with the flow of the magnetic flux on the inner peripheral side (the stator 1 1 side) between the adjacent permanent magnets 19, and the magnetic force can be effectively And the stator. Further, the synthetic resin 35 is formed between the portions forming the magnetic poles 24 of the cores 18 (formed portions 36). Thereby, the combination of the frame 17 of the synthetic resin 35 and the iron 18 and the permanent magnet 19 becomes stronger. Further, the hole 25 of the core 18 has a step 26 on the side of the permanent magnet 19 inserted into the hole, which retains the space 31 through which the synthetic resin 35 passes. Thereby, the permanent magnet 19 of the hole 25 of the iron core 18 is fixed, and the passage of the synthetic resin 35 can be sufficiently ensured and secured. Further, the core 18 is provided with a recessed portion 2 7 that is connected to the outer peripheral side of the hole 25 by the synthetic resin 35, whereby the permanent magnet 19 of the hole 25 of the core 18 is fixed by the recess The synthetic resin 35 of the missing portion 27 can positively approach the permanent magnet 19 to the inner peripheral side of the pocket 25. Further, the dimension B from the hole 25 to the outer peripheral side of the core 18 is larger than the dimension A from the hole 25 to the inner peripheral side. Thereby, the magnetic flux path from the hole 2 5 of the core 18 to the outer peripheral side can be largely ensured, and the magnetic flux flow can be excellent. In the above, the ninth embodiment of the present invention is the same as the first embodiment, and the same portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted. -14- (10) 1290787 In this case, the unit core 18a formed by dividing the core 18 in plural is shown by a joint 41. In this case, the seam 4 1 at the unit core 18 a causes the magnetic resistance to become large, and in this portion, the magnetic force becomes smaller than the other portions. Therefore, the rotor 11 is made slower in the portion where the magnetic force is smaller, and according to this situation, in the feedback-controlled motor, the current which is required to be rotated faster becomes larger. In this way, by measuring the increased current and voltage 値, it is possible to detect the rotational position of the rotor 16 and to detect the rotational position of the rotational load. Further, at this time, the size of the unit core 18 8 a becomes small, and the material using the material of the core 18 can also be excellent. In addition, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and scope of the invention. (Effects of the Invention) As described above, according to the rotor of the externally-transformed permanent magnet motor of the present invention, it is not necessary to form a concave portion into which the permanent magnet is inserted and the like in the forming mold, so that the molding die can be simplified, and the product price can be remarkably obtained. It is cheap. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a transverse cross-sectional view showing a main part of a rotor according to a first embodiment of the present invention. Fig. 2 is a vertical cross-sectional view showing a main portion taken along line X-X of Fig. 1. Fig. 3 is a longitudinal cross-sectional view showing a main portion along the Y - γ line of Fig. 1 - (11) 1290787 Fig. 4 is a perspective view showing the entire stator. Fig. 5 is a perspective view showing the frame of the rotor. Figure 6 is a bottom view showing the entire rotor. Fig. 7 is a partial perspective view showing the rotor. Fig. 8 is a longitudinal sectional side view showing the process of the rotor according to the forming die. Fig. 9 is a view corresponding to Fig. 1 showing a second embodiment of the present invention. Fig. 1 is a vertical cross-sectional view showing an entire rotor of the conventional example. Fig. 11 is a view corresponding to Fig. 1; Fig. 12 is a view corresponding to Fig. 8. Main component comparison table 11 Stator 16 Rotor 17 Rack 18 Core 18a Unit core 19 Permanent magnet 24 Magnetic pole 25 Hole 26 Step difference 27 Notch 28 Through hole (passage) -16- Inner peripheral space of the portion where the valley portion forms the core pole The joint of the unit core of the forming mold synthetic resin forming portion from the core hole to the inner peripheral side is measured from the core hole to the outer peripheral side of the dimension core. The radial maximum width of the core is the center of the radial maximum width -17-