200402922 (1) 玖、發明說明 【發明所屬之技術領域】 本發明是有關於一種將磁極形成用永久磁鐵組裝於轉 子鐵心的內部所構成的外轉型永久磁鐵電動機的轉子。 【先前技術】 t 作爲習知的外轉型永久磁鐵電動機有記載於如日本專 利第3017953號公報者。上述永久磁鐵電動機是具備：圓 板部及具有一體地設於上述圓板部的外周部的環狀壁的磁 性體製的機架，沿著上述機架的外周面的磁性體製的環構 件所構成的轉子。 上述永久磁鐵是朝徑向被磁化，並交互地配置成相鄰 接的永久磁鐵內周側的極性不相同。在上述轉子中，流在 相鄰接的永久磁鐵間的回流磁通是形成通過機架的環狀壁 及環構件之中。因此，環狀壁及環構件是成爲必須充分地 可確保永久磁鐵的磁路的厚度尺寸。 在上述永久磁鐵電動機中，藉由增大上述永久磁鐵的 磁力就可改善電動機特性，作爲該方法，採用增加上述永 久磁鐵的厚度，或高能量積的永久磁鐵。但是，當增加永 久磁鐵的磁力，則該分量，必須增加作爲後軛的環狀壁及 環構件的厚度尺寸。所以，有增加整體轉子的重量之同時 ，有大型化的問題。 【發明內容】 -5- (2) (2)200402922 本發明是鑑於上述事項而創作者，其目的是在於提供 一種一面抑制增加後軋的厚度尺寸一面可改善電動機特性 的外轉型永久磁鐵電動機的轉子。 本發明的申請專利範圍第1項的外轉型永久磁鐵電動 機的轉子，其係具有配設於定子的外周部的圓環形轉子鐵 心，及組裝於該內部的磁極形成用的複數永久磁鐵，其特 徵爲：上述永久磁鐵是設於上述轉子鐵心的內部成爲朝軸 方向延伸，被收納於斷面構成大約V形或大約圓弧形， 同時配設成該凸部朝上述轉子鐵心的外周側的插入孔。 依照上述構成，出入各永久磁鐵的磁通方向傾向周方 向。所以，不必確保轉子鐵心中較永久磁鐵位在外周部形 成磁路所需的空間，又，可不需作爲後軛的環狀壁及環構 件。又，較永久磁鐵流在內周側的轉子鐵心的磁通是集中 在磁極中央部之故，因而可將磁通密度分布接近於正弦波 形狀而可減低鑲齒扭矩（Ogging torque)。 本發明的申請專利範圍第2項的外轉型永久磁鐵電動 機的轉子中，形成各磁極的永久磁鐵，是由配設在插入孔 的周方向一方側半部及另一方側半部的兩個永久磁鐵所構 成，爲其特徵者。 配置於插入孔的周方向中央部的永久磁鐵，是該磁氣 方向成爲徑向之故，因而該分量會導致增加後軛的厚度尺 寸。藉由將形成各磁極的永久磁鐵作成配置於插入孔的周 方向一方側半部及另一方側半部的兩個永久磁鐵，可作成 在插入孔的周方向中央部未存有永久磁鐵的構成。 (3) (3)200402922 這時候，若將各永久磁鐵構成標準性形狀的大約平板 狀，則可減低該構造成本（申請專利範圍第3項的發明） 〇 又，上述轉子鐵心是由層積鐵板所構成，則可將能耗 抑制成較小（申請專利範圍第4項的發明）。 又，上述轉子鐵心是環狀地配置複數分割轉子鐵心所 構成，則可提高材料採用的效率（申請專利範圍第5項的 發明）。 本發明的申請專利範圍第6項的外轉型永久磁鐵電動 機的轉子，是在上述插入孔嵌入上述永久磁鐵，爲其特徵 者。依照上述構成，可將永久磁鐵牢固地組裝於轉子鐵心 的內部。 又，本發明的申請專利範圍第7項的外轉型永久磁鐵 電動機的轉子，是具備：在中心部具有軸支持部的圓形狀 主板部及豎設於上述主板部的外周緣部且具有沿著上述轉 子鐵心的外周面的環狀壁的機架；上述轉子鐵心與上述機 架是藉由樹脂一體地構成，爲其特徵者。 依照上述構成，可提昇轉子鐵心的強度。又，藉由一 體化轉子鐵心與機架的樹脂，可牢固地固定被收納於插入 孔的永久磁鐵。 本發明的申請專利範圍第8項的外轉型永久磁鐵電動 機的轉子，是將上述插入孔，構成開口在轉子鐵心的外周 面，爲其特徵者。 依照上述構成，可將永久磁鐵從上述插入孔的外周面 (4) (4)200402922 的開口插入在插入孔內。又，將永久磁鐵插入於插入孔之 後，藉由一體化轉子鐵心與機架，上述開口是藉由機架的 環狀壁。所以，永久磁鐵也不會經上述開口脫落。又，可 將永久磁鐵從上述開口插入在插入孔之故，因而堵住插入 孔的軸向兩端面而可進行永久磁鐵的軸向定位。 本發明的申請專利範圍第9項的外轉型永久磁鐵電動 機的轉子是上述插入孔的軸向兩端部中，封閉一方，爲其 特徵者。 依照上述構成，可將配設在轉子鐵心的內部的永久磁 鐵朝軸向定位。 本發明的申請專利範圍第1 0項的外轉型永久磁鐵電 動機的轉子中，上述插入孔是由對應於上述永久磁鐵的形 狀的收納部，及設於上述收納部的外周部，而上述永久磁 鐵被收納於上述收納部時，在上述永久磁鐵的外周部產生 空間部的凹部所構成，爲其特徵者。 依照上述構成，以樹脂一體化轉子鐵心與機架時，則 樹脂進入至上述空間部，藉由該樹脂使得永久磁鐵被推向 收納部內面中反凹部側的面，而被定位。 本發明的申請專利範圍第11項的外轉型永久磁鐵電 動機的轉子，是在轉子鐵心，設置以樹脂一體化上述轉子 鐵心與機架時，使得上述樹脂流入的貫通孔，爲其特徵者 。依照上述構成，可將轉子鐵心對於機架的固定成爲更牢 固者。 然而，轉子鐵心中比永久磁鐵位於內周部的部分，是 (5) (5)200402922 形成有與定子的磁路的部分之故，因而若在該部分設置貫 通孔，則導致降低電動機特性。又在本發明的申請專利範 圍第12項的外轉型永久磁鐵電動機的轉子中，上述貫通 孔是轉子鐵心中比永久磁鐵設於外周部。依照該構成，藉 由設置貫通孔使得電動機特性不會降低。 本發明的申請專利範圍第1 3項的外轉型永久磁鐵電 動機的轉子中，轉子鐵心的各磁極的內周面，是上述磁極 的中央部比周方向兩端部構成與固定鐵心之間的距離較小 ，爲其特徵者。 依照上述構成，鐵心間空隙的磁通密度是從磁極端部 平緩地變化，可將空隙磁通密度分布更接近於正弦波形狀 【實施方式】 以下，一面參照第1圖至第6圖一面說明本發明的第 一實施例。第1圖是表示構成本實施例的外轉型永久磁鐵 電動機的定子1的圖式，而第2圖至第5圖是表示轉子2 的圖式。首先，在第1圖中，定子1的定子鐵心3是形成 具有呈環狀的軛部4，及設成放射狀突出於該軛部4的外 周部的多數個齒5的構成。這時候，定子鐵心3是藉由朝 周方向地連結複數個分割鐵心（未圖示）形成呈環狀。各 分割鐵心是層積多數枚被沖切成所定形狀的矽鋼板所構成 在定子鐵心3的軛部4及各齒5的外面的大約整體， (6) (6)200402922 藉由模塑成形設有絕緣樹脂製的覆蓋構件6。在覆蓋構件 6位於軛部4的內周側而一體地設有複數個安裝部7。該 安裝部7，是被利用在將定子鐵心安裝於如洗衣機的機構 部（未圖示）的時候。在各齒5捲繞有線圈8，藉由以上 構成定子1。 另一方面，如第2圖至第5圖所示地，轉子2是藉由 以合成樹脂1 1 一體地成形機架9與轉子鐵心1 0所構成。 機架9是藉由壓製加工磁性體之如電磁鐵板而形成扁平有 底圓筒狀者，在中心部具有軸支持體安裝孔1 2的主板部 13，及豎設在上述主板部13的外周緣部的環狀壁14所構 成。在上述軸支持體安裝孔12，成爲能安裝支持旋轉軸 的軸支持體（均未圖示）。上述旋轉軸是經由未圖示的軸 承而成爲旋轉自如地支持之狀態。 在上述主板部1 3的外周部所有全周設有段差部1 5 ; 上述轉子鐵心1 0是被配置在圍繞於段差部1 5及環狀壁 14的空間。此時，轉子鐵心1〇的內周面與段差部1 5的 內周面是構成大約同一面。在上述段差部15有複數孔16 形成於所有全周。 又，在上述主板部1 3中比上述段差部1 5更接近內周 部的部分，藉由豎起加工所形成的複數通風孔1 3a以軸支 持體安裝孔1 2爲中心配置成放射狀。又，在第2圖中， 相反地表示機架9的上下。 上述轉子鐵心1 0是藉由層積多數枚被沖切成大約圓 環狀的磁性體的如鐵板所構成。在上述轉子鐵心1 0的內 -10- (7) (7)200402922 部設有多數V形狀的插入孔17，而在各插入孔17分別配 設有磁極形成用的一對永久磁鐵1 8。在本實施例中，各 磁極是由一對永久磁鐵1 8所構成。 上述插入孔1 7是中央折彎部位於轉子鐵心1 0的外周 側，而周方向兩端部配置在位於轉子鐵心1 〇的內周側方 向，在上述折彎部中開設於上述轉子鐵心1 〇的外周面。 在構成轉子鐵心1 〇的層積鐵板中位於軸向兩端部的一至 複數枚鐵板形成有相對應於插入孔1 7的孔。因此，上述 插入孔1 7的軸向兩端部是未開口。 上述一對永久磁鐵1 8是呈矩形狀的平板狀，分別配 設於上述插入孔17中從折彎部至一端部的收納部17a、 及從折彎部至另一端的收納部1 7b。在各收納部1 7a、1 7b 的外周部中央，分別設有朝軸向全面地延伸的斷面半圓形 的凹部1 9。上述永久磁鐵1 8是形成從轉子鐵心1 0的外 周面經插入孔1 7的開口 1 7 c被插入在各收納部1 7 a、1 7b 。此時，在上述凹部1 9未設置永久磁鐵1 8而產生空間部 〇 上述永久磁鐵1 8是採用該磁力大約3 1 6 ( MA/m )以 上的高能量積者。各永久磁鐵1 8是朝厚度方向磁化，一 對永久磁鐵1 8是配設於各收納部1 7a、1 7b成爲內周側的 極性相同。 又，在上述轉子鐵心1 0中位於上述插入孔1 7之間的 部分設有朝軸向貫通的圓形狀的貫通孔20。又，在上述 轉子鐵心1 〇之外周面中位於上述插入孔1 7之間的部分設 -11 - (8) (8)200402922 有朝軸向貫通的半圓形缺口 21。 上述轉子2是在上述機架9的環狀壁14及段差部15 與上述轉子鐵心1 0之間塡充合成樹脂1 1使之硬化而藉由 一體化機架9與轉子鐵心1 0所構成。此時，上述合成樹 脂1 1是形成經孔1 6也位於機架9的外部。上述合成樹脂 11是形成也塡充在貫通孔20及缺口 21的內部。藉由以 上構成，轉子鐵心1 0是牢固地被固定在機架9。 又，上述合成樹脂1 1是形成經開口 1 7 c也流進插入 孔17。由此，各永久磁鐵18是被推向收納部17a、17b 的內周側端部而被定位。又，流進插入孔1 7的樹脂1 1是 經永久磁鐵1 8與收納部1 7a、1 7b之間的間隙而流進凹部 (室間部）1 9。由此，永久磁鐵1 8是推向收納部1 7a、 1 7b的內面中反凹部〗9側的面而被定位。 以下參照第6圖說明上述構成的作用。第6圖是表示 出入永久磁鐵1 8的磁通。又，在第6圖中表示轉子鐵心 1 〇下方爲內周側（定子1側）。 在本實施例中，各永久磁鐵1 8配置成傾斜地橫跨著 轉子鐵心1 0內部之故，因而出入永久磁鐵1 8的磁通φ的 方向朝周方向傾斜。因此，相鄰接的磁極的回流磁通的磁 路是主要形成在轉子鐵心1 0的內部，而成爲不需要將磁 路形成在機架9的環狀壁1 4的情形。所以，一將環狀壁 1 4的厚度尺寸，設定成可確保用以支持轉子鐵心1 〇所需 的機械性強度的尺寸就可以，而與習知相比較可更減小厚 度尺寸以得到輕量化。 -12- (9) (9)200402922 又，流動在比永久磁鐵1 8更內周側的轉子鐵心1 〇的 磁通Φ是朝磁極中央部之故，因而磁通密度在磁極中央部 者高於端部者。因此，鐵心間空隙的磁通密度分布接近於 正弦波形狀，可減低鑲齒扭矩而可提高電動機特性。 如此地，在本實施例中，在轉子鐵心1 〇內部設置V 形插入孔1 7，而由被收納於該插入孔1 7的兩個永久磁鐵 1 8構成各磁極，使得各永久磁鐵1 8的磁性方向朝周方向 。因此，成爲在機架9的環狀壁14不需要作爲後軛的功 能，而該分量，可減小環狀壁14的厚度尺寸。 又，插入孔1 7中分成周方向一方側的收納部1 7a及 另一方側的收納部1 7 b收納兩個永久磁鐵1 8。因此，在 磁性方向成爲徑向的插入孔17的周方向中央部可作成未 存有永久磁鐵的構成，由此，也可減小機架9的厚度尺寸 〇 又，也可考量永久磁鐵1 8是採用磁性方向性成爲周 方向的極各向異性的永久磁鐵（塑膠磁鐵），來減小轉子 鐵心1 0的徑向尺寸。但是，極各向異性的永久磁鐵是有 製造成本較高的缺點。對此在本實施例中，使用標準性形 狀的矩形板狀永久磁鐵1 8之故，因而可抑制製造成本。 又，由層積鐵板構成上述轉子鐵心1 〇。因此，可減 少能耗。 又，以合成樹脂11 一體化轉子鐵心1 〇與機架9。特 別是，在本實施例中，在轉子鐵心1 〇設置貫通孔20或缺 口 21，而在此些貫通孔20，缺口 21構成塡充著合成樹脂 •13- (10) (10)200402922 1 1之故，因而可牢固地一體化轉子鐵心1 〇與機架9。這 時候，上述貫通孔20或缺口 2 1是位在永久磁鐵1 8的外 周側之故，因而對電動機特性不會有不良影響。 又，將插入孔1 7開設在轉子鐵心1 〇的外周面，同時 塞住該上下端部。所以’可防止永久磁鐵1 8朝軸向偏離 移動。 第7圖是表示本發明的第二實施例者，說明與第一實 施例不相同處。又，在與第一實施例相同部分賦於相同記 號。在該第二實施例中，藉由環狀地配置複數分割鐵心 3 1而構成轉子鐵心1 〇。上述分割鐵心3 1是每一複數磁極 地分割轉子鐵心1 〇者，而構成相鄰接的分割鐵心31的連 結部3 1 a位於磁極間。 所以可得到轉子鐵心1 〇的材料採用的效率化。而且 構成分割鐵心3 1的連結部位於磁極間之故，因而對於鐵 心間的磁通密度分布不會有不良影響。 又，在本實施例中，在上述轉子鐵心10的各磁極內 周面中除了周方向兩端部之部分以外設置圓弧面狀凸部 32，使得轉子鐵心1 0的各磁極的周方向兩端部的徑向尺 寸短於磁極中央部的徑向尺寸。凸部32的形狀及配置， 各部尺寸是設成使得空隙磁通密度分布成爲大約正弦波形 狀，本案發明人經實驗所求得者。 由上述構成，可得到提高電動機特性。又，在本實施 例中，構成將插入孔1 7的收納部1 7a、1 7b的寬度尺寸設 定成與永久磁鐵1 8的厚度尺寸大約相同或稍小，並能將 -14- 694 (11) (11)200402922 上述永久磁鐵1 8嵌入於上述收納部1 7 a、1 7 b。因此，在 本實施例中，在上述收納部l7a、17b的外周部未設置凹 部19。 又，在本實施例中，未將貫通孔2 0及缺口 21設在轉 子鐵心1 〇。在本實施例中，構成以合成樹脂1 1 一體化上 述轉子鐵心1 〇與機架9之際，上述樹脂1 1被塡充在轉子 鐵心1 〇的內周面中位於凸部3 2與凸部3 2之間。所以， 雖省略了上述貫通孔20及缺口，也可將轉子鐵心1 〇固定 在機架9成爲牢固者。 而且，藉由將合成樹脂11塡充在轉子鐵心10的內周 面中位於凸部3 2與凸部3 2之間，可減小轉子鐵心1 〇內 周面的凹凸。因此，藉由將凸部32設在轉子鐵心10的內 周面，可抑制隨著轉子鐵心1 〇的旋轉所發生的噪音的增 大。 第8圖是表示本發明的第三實施例者，說明與第一實 施例不相同的。在該第三實施例中，在插入孔1 7的開口 1 7c附近設置突起4 1。上述突起4 1是設置成分別對應於 插入孔1 7的收納部1 7a、1 7b，而將永久磁鐵插入在各收 納部17a、17b之前，朝外周側突出。之後，將永久磁鐵 1 8插入在各收納部1 7 a、1 7 b之後，折彎而將永久磁鐵1 8 推向內周側。 在此種構件中，也可將永久磁鐵1 8定位在各收納部 1 7a、1 7b內的所定位置。 又，在上述實施例中，均將矩形板狀的永久磁鐵18 -15- (12) (12)200402922 組裝於轉子鐵心1 0 ’惟如表示於第9圖的第4實施例， 將呈大約圓弧板狀的複數永久磁鐵51組裝於轉子鐵心10 也可以。這時候，由一個永久磁鐵5 1形成有一個磁極。 在上述構成中，永久磁鐵51的磁性方向朝周方向傾 斜之故，因而也可減少機架9的厚度尺寸。 又，本發明是並不被限定於上述實施例者，例如有如 下變形。 機架是塑膠製也可以。亦即，機架是具有支持轉子鐡 心的功能，並不需作爲後軛的功能。因此，藉由將機架作 爲塑膠製而可得到輕量化。 (發明效果） 由以上說明可知，本發明的外轉型永久磁鐵電動機的 轉子，係將磁極形成用的複數永久磁鐵組裝於配設在定子 外周部的轉子鐵心內部者，設於上述轉子鐵心的內部成爲 朝軸方向延伸，被收納於斷面構成大約V形或大約圓弧 形，同時配設成該凸部朝上述轉子鐵心的外周側的插入孔 收納上述永久磁鐵之故，因而可將上述永久磁鐵的磁性方 向朝周方向傾斜，該分量可減少後軛的厚度尺寸。又，鐵 心間的磁通密度分布接近於正弦波形狀而可減低鑲齒扭矩 【圖式簡單說明】 第1圖是表示本發明的第一實施例的外轉型永久磁鐵 ΰ'8δ -16- (13) (13)200402922 電動機的定子的構成的立體圖° 第2圖是表示轉子的構成的立體圖。 第3圖是表示轉子的橫剖視圖。 第4圖是表示第3圖中沿著XbXl線的轉子的縱剖 視圖。 第5圖是表示第3圖中沿著X2_X2線的轉子的縱剖 視圖。 第6圖是表示用以說明磁通密度分布的圖式。 第7圖是表示本發明的第二實施例的第3圖相當圖。 第8圖是表示本發明的第三實施例的第3圖相當圖。 第9圖是表示本發明的第四實施例的第6圖相當圖。 (記號之說明） 1 :定子 2 :轉子 9 :機架 I 〇 :轉子鐵心 II :合成樹脂 13 :主板部 14 :環狀壁 1 7 :插入孔 1 8 :永久磁鐵 17a、17b :收納部 17c ··開口 -17- (14)200402922 1 9 ·•凹部 2 0 :貫通孔200402922 (1) 发明. Description of the invention [Technical field to which the invention belongs] The present invention relates to a rotor of an outer-transformed permanent-magnet motor constituted by assembling a permanent magnet for forming magnetic poles inside a rotor core. [Prior art] As a conventional external-transformed permanent magnet motor, it is described in, for example, Japanese Patent No. 3017953. The permanent magnet motor includes a circular plate portion and a frame having a magnetic system having an annular wall integrally provided on an outer peripheral portion of the circular plate portion, and a ring member having a magnetic system along an outer peripheral surface of the frame. Rotor. The permanent magnets are magnetized in the radial direction and are alternately arranged so that the polarities on the inner peripheral sides of the adjacent permanent magnets are different. In the above-mentioned rotor, the return magnetic flux flowing between the adjacent permanent magnets is formed in the annular wall and the ring member of the frame. Therefore, the annular wall and the ring member must have a thickness sufficient to secure the magnetic circuit of the permanent magnet. In the above-mentioned permanent magnet motor, the characteristics of the motor can be improved by increasing the magnetic force of the permanent magnet. As this method, a permanent magnet having an increased thickness or a high energy product is used. However, when the magnetic force of the permanent magnet is increased, it is necessary to increase the thickness of the ring wall and the ring member as the yoke. Therefore, there is a problem of increasing the weight of the entire rotor while increasing the size. [Summary of the Invention] -5- (2) (2) 200402922 The present invention was created in view of the above matters, and its object is to provide an external transformation permanent magnet motor that can improve the characteristics of the motor while suppressing the increase in the thickness of the post-rolling. Rotor. The rotor of the outer-transformed permanent magnet motor according to the first patent application scope of the present invention includes a ring-shaped rotor core arranged on the outer peripheral portion of the stator, and a plurality of permanent magnets for forming magnetic poles assembled in the inner portion. It is characterized in that the permanent magnet is provided inside the rotor core so as to extend in the axial direction, and is housed in a cross-section to form an approximately V-shape or an approximately circular arc shape, and is arranged such that the convex portion faces the outer peripheral side of the rotor core. Insert the hole. According to the above configuration, the direction of the magnetic flux to and from each of the permanent magnets is in the circumferential direction. Therefore, it is not necessary to ensure the space required for forming a magnetic circuit in the rotor core compared with the permanent magnets at the outer periphery, and it is not necessary to use the ring wall and ring member as the back yoke. In addition, since the magnetic flux flowing from the rotor core on the inner peripheral side is more concentrated at the center of the magnetic pole than the permanent magnet, the magnetic flux density distribution can be approximated to a sine wave shape, and the cogging torque can be reduced. In the rotor of an outer-transformed permanent magnet motor according to item 2 of the present invention, the permanent magnets forming each magnetic pole are two permanent magnets arranged on one side half and the other side half of the circumferential direction of the insertion hole. Characterized by a magnet. The permanent magnet disposed at the center portion in the circumferential direction of the insertion hole is such that the magnetic direction becomes radial. Therefore, this component increases the thickness of the back yoke. By forming the permanent magnets forming the magnetic poles into two permanent magnets arranged on one side half and the other half side in the circumferential direction of the insertion hole, a configuration in which the permanent magnets are not stored in the center portion in the circumferential direction of the insertion hole can be made. . (3) (3) 200402922 At this time, if each permanent magnet is formed into a substantially flat plate shape with a standard shape, the construction cost can be reduced (the invention in the third aspect of the patent application). The rotor core is laminated. The iron plate can reduce the energy consumption to a small amount (the invention in the scope of patent application No. 4). In addition, the above-mentioned rotor core is constituted by arranging a plurality of divided rotor cores in a ring shape, which can improve the efficiency of material use (the invention in claim 5 of the scope of patent application). The rotor of the outer-transformed permanent magnet motor according to the sixth aspect of the present invention is a feature in which the permanent magnet is inserted into the insertion hole. According to the above configuration, the permanent magnet can be firmly assembled inside the rotor core. In addition, the rotor of the outer-transformed permanent magnet motor according to claim 7 of the present invention includes a circular main plate portion having a shaft support portion in a center portion and an outer peripheral edge portion erected on the main plate portion and having The ring-shaped wall frame on the outer peripheral surface of the rotor core; the rotor core and the frame are integrally formed of resin, which is characteristic. According to the above configuration, the strength of the rotor core can be increased. In addition, by integrating the rotor core and the resin of the frame, the permanent magnet stored in the insertion hole can be firmly fixed. The rotor of the outer-transformed permanent magnet motor according to claim 8 of the present invention is characterized in that the above-mentioned insertion hole is formed in the outer peripheral surface of the rotor core. According to the above configuration, the permanent magnet can be inserted into the insertion hole from the opening of the outer peripheral surface (4) (4) 200402922 of the insertion hole. After the permanent magnet is inserted into the insertion hole, the rotor core and the frame are integrated, and the opening is formed by the annular wall of the frame. Therefore, the permanent magnet does not fall off through the opening. Further, since the permanent magnet can be inserted into the insertion hole from the opening, the axial end surfaces of the insertion hole are blocked and the permanent magnet can be positioned in the axial direction. The rotor of the outer-transformed permanent magnet motor according to claim 9 of the present invention is characterized by closing one of the axial ends of the insertion hole. According to the above configuration, the permanent magnet disposed inside the rotor core can be positioned in the axial direction. In the rotor of an externally transformed permanent magnet motor according to the scope of application of the present invention, the insertion hole is formed by a storage portion corresponding to the shape of the permanent magnet, and an outer peripheral portion of the storage portion, and the permanent magnet When it is accommodated in the said accommodating part, it is characterized by the recessed part which produced the space part in the outer peripheral part of the said permanent magnet. According to the above configuration, when the rotor core and the frame are integrated with resin, the resin enters the above-mentioned space portion, and the permanent magnet is pushed against the surface of the concave portion side of the inner surface of the storage portion by the resin, and is positioned. The rotor of the externally transformed permanent magnet motor according to the eleventh aspect of the patent application of the present invention is characterized by a through-hole that allows the resin to flow into the rotor core when the rotor core and the frame are integrated with resin. According to the above structure, the rotor core can be more firmly fixed to the frame. However, the part of the rotor core that is located at the inner periphery than the permanent magnet is the part where (5) (5) 200402922 forms a magnetic circuit with the stator. Therefore, if a through hole is provided in this part, the motor characteristics will be degraded. In the rotor of the outer-transformed permanent magnet motor according to claim 12 of the present invention, the through-hole is provided in the rotor core at the outer peripheral portion than the permanent magnet. According to this configuration, the motor characteristics are not deteriorated by providing the through holes. In the rotor of an externally transformed permanent magnet motor according to item 13 of the scope of application of the present invention, the inner peripheral surface of each magnetic pole of the rotor core is the distance between the central portion of the magnetic pole and the two ends in the circumferential direction and the fixed core. Smaller is its characteristic. According to the above configuration, the magnetic flux density of the gaps between the cores is gradually changed from the magnetic extreme portion, and the gap magnetic flux density distribution can be closer to a sine wave shape. [Embodiment] Hereinafter, it will be described with reference to FIGS. 1 to 6 A first embodiment of the present invention. Fig. 1 is a diagram showing a stator 1 constituting the outer-transformed permanent magnet motor of this embodiment, and Figs. 2 to 5 are diagrams showing a rotor 2. Figs. First, in the first figure, the stator core 3 of the stator 1 is configured to have a ring-shaped yoke portion 4 and a plurality of teeth 5 provided to protrude radially from the outer peripheral portion of the yoke portion 4. At this time, the stator core 3 is formed in a ring shape by connecting a plurality of divided cores (not shown) in the circumferential direction. Each of the divided cores is an approximately entire body formed by stacking a plurality of silicon steel plates punched into a predetermined shape on the outer surface of the yoke portion 4 and the teeth 5 of the stator core 3, There is a cover member 6 made of insulating resin. A plurality of attachment portions 7 are integrally provided on the cover member 6 on the inner peripheral side of the yoke portion 4. This mounting portion 7 is used when the stator core is mounted on a mechanism portion (not shown) such as a washing machine. A coil 8 is wound around each tooth 5, and the stator 1 is configured as described above. On the other hand, as shown in FIGS. 2 to 5, the rotor 2 is formed by integrally molding the frame 9 and the rotor core 10 with a synthetic resin 1 1. The frame 9 is a flat bottomed cylindrical shape formed by pressing a magnetic body such as an electromagnet plate, a main plate portion 13 having a shaft support body mounting hole 12 in the center portion, and a main plate portion 13 which is erected on the main plate portion 13 The outer peripheral edge portion is formed by an annular wall 14. In the above-mentioned shaft support body mounting hole 12, a shaft support body (none of which is shown) capable of mounting a rotating shaft is installed. The rotation shaft is rotatably supported by a bearing (not shown). The stepped portion 15 is provided on the entire periphery of the outer peripheral portion of the main plate portion 13; the rotor core 10 is disposed in a space surrounding the stepped portion 15 and the annular wall 14. At this time, the inner peripheral surface of the rotor core 10 and the inner peripheral surface of the step portion 15 are approximately the same surface. A plurality of holes 16 are formed in the step portion 15 over the entire circumference. Also, in the main plate portion 13 which is closer to the inner peripheral portion than the stepped portion 15, a plurality of ventilation holes 1 3a formed by erecting processing are arranged radially with the shaft support body mounting hole 12 as a center. . In FIG. 2, the upper and lower sides of the rack 9 are shown in reverse. The rotor core 10 described above is formed by laminating a plurality of magnetic bodies punched into a substantially circular ring shape, such as an iron plate. A plurality of V-shaped insertion holes 17 are provided in the -10- (7) (7) 200402922 portion of the rotor core 10, and a pair of permanent magnets 18 for forming a magnetic pole are arranged in each of the insertion holes 17. In this embodiment, each magnetic pole is constituted by a pair of permanent magnets 18. The insertion hole 17 is a central bent portion located on the outer peripheral side of the rotor core 10, and both ends in the circumferential direction are arranged on the inner peripheral side of the rotor core 10. The bent portion is opened in the rotor core 1 〇's outer peripheral surface. In the laminated iron plate constituting the rotor core 10, one to a plurality of iron plates located at both axial end portions are formed with holes corresponding to the insertion holes 17. Therefore, both ends of the insertion hole 17 in the axial direction are not opened. The pair of permanent magnets 18 have a rectangular flat plate shape, and are respectively disposed in the insertion hole 17 in the storage portion 17a from the bent portion to one end portion and the storage portion 17b from the bent portion to the other end. In the center of the outer peripheral portion of each of the accommodating portions 17a and 17b, there are provided semi-circular recessed portions 19 which extend in the axial direction and are completely extended in the axial direction. The permanent magnet 18 is an opening 17c formed from an outer peripheral surface of the rotor core 10 through an insertion hole 17 and inserted into each of the storage portions 17a and 17b. At this time, the permanent magnet 18 is not provided in the recessed portion 19, and a space portion is generated. The permanent magnet 18 is a high-energy product having a magnetic force of approximately 3 1 6 (MA / m) or more. Each of the permanent magnets 18 is magnetized in the thickness direction, and a pair of permanent magnets 18 are arranged on the respective housing portions 17a and 17b so that the polarities are the same on the inner peripheral side. A circular through-hole 20 is formed in a portion of the rotor core 10 located between the insertion holes 17 in the axial direction. Further, a portion between the insertion holes 17 in the outer peripheral surface of the rotor core 10 is provided with a semicircular notch 21 penetrating in the axial direction. The rotor 2 is formed by integrating a synthetic resin 11 between the annular wall 14 and the stepped portion 15 of the housing 9 and the rotor core 10 to harden it, and integrating the housing 9 and the rotor core 10. . At this time, the synthetic resin 11 is formed with via holes 16 and is also located outside the frame 9. The synthetic resin 11 is formed and filled inside the through hole 20 and the notch 21 as well. With the above configuration, the rotor core 10 is firmly fixed to the frame 9. The synthetic resin 11 is formed through the opening 17c and also flows into the insertion hole 17. Accordingly, each of the permanent magnets 18 is positioned by being pushed toward the inner peripheral side end portions of the storage portions 17a and 17b. The resin 11 flowing into the insertion hole 17 flows into the recessed portion (inter-chamber portion) 19 through the gap between the permanent magnet 18 and the storage portions 17a and 17b. Thereby, the permanent magnet 18 is positioned by being pushed toward the surface of the anti-recessed portion 9 of the inner surfaces of the storage portions 17a, 17b. The effect of the above-mentioned configuration will be described below with reference to FIG. 6. Fig. 6 shows the magnetic fluxes entering and leaving the permanent magnet 18. In addition, in FIG. 6, the lower part of the rotor core 10 is the inner peripheral side (the stator 1 side). In this embodiment, since the permanent magnets 18 are arranged obliquely across the inside of the rotor core 10, the direction of the magnetic flux φ entering and leaving the permanent magnets 18 is inclined in the circumferential direction. Therefore, the magnetic circuit of the return magnetic flux of the adjacent magnetic poles is mainly formed inside the rotor core 10, and it is not necessary to form the magnetic circuit in the annular wall 14 of the frame 9. Therefore, as long as the thickness of the annular wall 14 is set to a size that can ensure the mechanical strength required to support the rotor core 10, the thickness can be further reduced to obtain a lighter weight compared with the conventional one. Quantification. -12- (9) (9) 200402922 In addition, the magnetic flux Φ flowing through the rotor core 10 on the inner peripheral side than the permanent magnet 18 is directed toward the center of the magnetic pole, so the magnetic flux density is higher in the center of the magnetic pole At the end. Therefore, the magnetic flux density distribution of the gaps between the cores is close to a sine wave shape, which can reduce the cogging torque and improve the motor characteristics. In this way, in this embodiment, a V-shaped insertion hole 17 is provided inside the rotor core 10, and each magnetic pole is constituted by two permanent magnets 18 accommodated in the insertion hole 17, so that each permanent magnet 18 The magnetic direction is toward the circumference. Therefore, the function of the ring-shaped wall 14 in the frame 9 as a back yoke is unnecessary, and this component can reduce the thickness of the ring-shaped wall 14. Further, the insertion hole 17 is divided into a storage portion 17a on one side in the circumferential direction and a storage portion 17b on the other side in which two permanent magnets 18 are stored. Therefore, the center portion in the circumferential direction of the insertion hole 17 having a radial direction in the magnetic direction can be made without a permanent magnet, thereby reducing the thickness of the frame 9 and taking into account the permanent magnet 18 Permanent magnets (plastic magnets) with magnetic anisotropy in the circumferential direction are used to reduce the radial size of the rotor core 10. However, a permanent anisotropic permanent magnet has the disadvantage of high manufacturing cost. On the other hand, in this embodiment, since a rectangular plate-shaped permanent magnet 18 having a standard shape is used, the manufacturing cost can be suppressed. The rotor core 10 is composed of a laminated iron plate. Therefore, energy consumption can be reduced. The rotor core 10 and the frame 9 are integrated with a synthetic resin 11. In particular, in this embodiment, a through-hole 20 or a notch 21 is provided in the rotor core 10, and in these through-holes 20, the notch 21 constitutes a synthetic resin-filled 13- (10) (10) 200402922 1 1 Therefore, the rotor core 10 and the frame 9 can be firmly integrated. At this time, the above-mentioned through hole 20 or notch 21 is located on the outer peripheral side of the permanent magnet 18, and therefore it does not adversely affect the characteristics of the motor. The insertion hole 17 is opened in the outer peripheral surface of the rotor core 10, and the upper and lower ends are plugged. Therefore, it is possible to prevent the permanent magnet 18 from shifting in the axial direction. Fig. 7 is a diagram showing a second embodiment of the present invention, and illustrates differences from the first embodiment. The same symbols are assigned to the same parts as those in the first embodiment. In the second embodiment, the rotor core 10 is configured by arranging the plurality of divided cores 31 in a ring shape. The divided core 31 is a rotor core 10 divided into plural magnetic poles, and the connecting portions 3 1 a constituting adjacent divided cores 31 are located between the magnetic poles. Therefore, the efficiency of the material used for the rotor core 10 can be obtained. In addition, since the connecting portion constituting the divided core 31 is located between the magnetic poles, it does not adversely affect the magnetic flux density distribution between the cores. Further, in this embodiment, arc-shaped convex portions 32 are provided on the inner peripheral surface of each magnetic pole of the rotor core 10 except for both ends in the circumferential direction, so that the circumferential direction of each magnetic pole of the rotor core 10 is two. The radial dimension of the end portion is shorter than the radial dimension of the center portion of the magnetic pole. The shape and arrangement of the convex portion 32 are set so that the size of the gap magnetic flux density becomes approximately sinusoidal. The inventor of the present invention obtained it through experiments. With the above configuration, the motor characteristics can be improved. Further, in this embodiment, the width dimension of the storage portions 17a, 17b of the insertion hole 17 is set to be approximately the same as or slightly smaller than the thickness dimension of the permanent magnet 18, and -14-694 (11 ) (11) 200402922 The permanent magnets 18 are embedded in the storage portions 1 7 a and 1 7 b. Therefore, in this embodiment, no recessed portion 19 is provided on the outer peripheral portion of the storage portions 17a, 17b. In this embodiment, the through-hole 20 and the notch 21 are not provided in the rotor core 10. In the present embodiment, when the rotor core 10 and the frame 9 are integrated with a synthetic resin 1 1, the resin 11 is filled in the inner peripheral surface of the rotor core 10 at the convex portion 32 and the convex portion. Department between 3 and 2. Therefore, although the above-mentioned through hole 20 and the cutout are omitted, the rotor core 10 may be fixed to the frame 9 to become a strong person. Further, by filling the inner peripheral surface of the rotor core 10 with the synthetic resin 11 塡 between the convex portions 32 and 32, the unevenness of the inner peripheral surface of the rotor core 10 can be reduced. Therefore, by providing the convex portion 32 on the inner peripheral surface of the rotor core 10, it is possible to suppress an increase in noise generated as the rotor core 10 rotates. Fig. 8 shows a third embodiment of the present invention, and the description is different from the first embodiment. In this third embodiment, a protrusion 41 is provided near the opening 17c of the insertion hole 17. The protrusions 41 are provided in the receiving portions 17a, 17b corresponding to the insertion holes 17, respectively, and the permanent magnets are inserted in front of the receiving portions 17a, 17b, and protrude toward the outer peripheral side. After that, the permanent magnets 18 are inserted into each of the storage portions 17a and 17b, and then the permanent magnets 18 are bent to push the permanent magnets 18 toward the inner peripheral side. In such a member, the permanent magnet 18 may be positioned at a predetermined position in each of the storage sections 17a, 17b. In the above embodiments, the rectangular plate-shaped permanent magnets 18 -15- (12) (12) 200 402 922 are assembled to the rotor core 1 0 ′, but as shown in the fourth embodiment of FIG. 9, it will be approximately The arc-shaped plate-shaped plural permanent magnets 51 may be incorporated in the rotor core 10. At this time, one magnetic pole is formed by one permanent magnet 51. In the above configuration, since the magnetic direction of the permanent magnet 51 is inclined in the circumferential direction, the thickness dimension of the frame 9 can also be reduced. It should be noted that the present invention is not limited to the above-mentioned embodiments, and may be modified as follows, for example. The frame is also made of plastic. That is, the frame has the function of supporting the center of the rotor, and does not need to function as a back yoke. Therefore, it is possible to reduce the weight by making the frame made of plastic. (Effects of the Invention) As can be seen from the above description, the rotor of the outer-transformed permanent magnet motor of the present invention is one in which a plurality of permanent magnets for forming magnetic poles are assembled inside a rotor core arranged on the outer periphery of the stator, and are provided inside the rotor core The permanent magnet is extended in the axial direction and is accommodated in a cross-section to form an approximately V-shape or an approximately arc shape. The convex portion is arranged so that the permanent magnet is accommodated in the insertion hole of the rotor core on the outer peripheral side. The magnetic direction of the magnet is inclined toward the circumferential direction, and this component can reduce the thickness dimension of the back yoke. In addition, the magnetic flux density distribution between the iron cores is close to the shape of a sine wave, which can reduce the cogging torque. [Simplified description of the drawing] FIG. 13) (13) 200402922 Perspective view of the structure of the stator of the motor ° Figure 2 is a perspective view showing the structure of the rotor. Fig. 3 is a cross-sectional view showing a rotor. Fig. 4 is a longitudinal sectional view of the rotor taken along line XbXl in Fig. 3; Fig. 5 is a longitudinal sectional view of the rotor taken along line X2_X2 in Fig. 3; FIG. 6 is a diagram illustrating a magnetic flux density distribution. Fig. 7 is a diagram corresponding to Fig. 3 showing a second embodiment of the present invention. Fig. 8 is a diagram corresponding to Fig. 3 showing a third embodiment of the present invention. Fig. 9 is a diagram corresponding to Fig. 6 showing a fourth embodiment of the present invention. (Description of symbols) 1: Stator 2: Rotor 9: Frame I 〇: Rotor core II: Synthetic resin 13: Main plate portion 14: Ring wall 17: Insertion hole 18: Permanent magnets 17a, 17b: Storage portion 17c ·· Opening-17- (14) 200402922 1 9 · Concavity 2 0: Through hole
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