201247961 六、發明說明： 【發明所屬之技術領域】 本實施形態是關於一種滾筒式洗衣機° 【先前技術】 例如在滾筒式洗衣機，藉由配置在外箱與水槽之間的 複數個懸吊彈性地支持配置於外箱內的水槽，而減低隨著 滾筒的旋轉的水槽的振動。 作爲這種的懸吊，近年有考慮使用衰減力可變的阻尼 器的想法，在阻尼器內塡充有磁性黏性流體作爲功能性流 體（例如，參照專利文獻1 )。 具體而言，例如將推桿可往復動地設在壓缸內，並且 在其推桿前端的活塞配設使磁場產生用的線圈。而構成收 容在活塞外周與壓缸內周的間隙的磁性黏性流體流動。而 且，當水槽在上下方向振動時，活塞與壓缸相對性地振動 ’並利用磁性黏性流體的黏性產生的抵抗賦予衰減力，減 弱水槽的振動。 於此’對線圈通電時’磁場產生而對磁性黏性流體賦 予磁場，使磁性黏性流體的黏度變高。藉此，因爲活塞與 壓缸之間的抵抗增大，活塞相對的移動變的不易，所以衰 減力變大。 [先前技術文獻] [專利文獻] 201247961 [專利文獻1 ]日本特開2 0 0 8 — 2 9 5 9 0 6號公報 【發明內容】 [發明所欲解決之課題] 在滾筒式洗衣機存在複數個共振點（共振頻率），當 滾筒的旋轉速度上昇時’水槽主要產生在上下方向振動的 共振、在左右方向振動的共振等。 然而，在以往的滾筒式洗衣機，不一定有對應水槽的 振動的態樣，藉由阻尼器抑制振動、噪音的效果並不足夠 〇 於此’一種具阻尼器的滾筒式洗衣機，係以獲得可更 有效果地抑制振動、噪音的滾筒式洗衣機作爲目的。 [解決課題用的手段] 本實施形態的滾筒式洗衣機具備有：外箱；設於前述 外箱內的水槽；可旋轉地設於前述水槽內的滾筒；設於前 述外箱與前述水槽之間，使前述水槽的振動減弱的阻尼器 ;以及可變控制前述阻尼器的衰減力的控制手段。前述控 制手段是構成可在前述滾筒進行旋轉一次的期間使前述阻 尼器的衰減力改變，並依據前述滾筒的旋轉週期性地反覆 執行其可變控制的控制。 藉此，進行對應隨著滾筒的旋轉的週期性的扭矩變動 ，在滾筒旋轉一次的期間使衰減力改變的極細微的控制， 而可提昇振動、噪音的抑制效果的滾筒式洗衣機。 -6- 201247961 【實施方式】 [實施發明用的形態] <第1實施形態> 以下，參照圖1至圖9針對第1實施形態進行說明。 圖2表示滾筒式洗衣機（以下，僅稱爲洗衣機）的全體構 造。如同圖所示，外箱1呈形成洗衣機的外殻的箱狀，在 其前面側（同圖的右側）的中央部’形成有洗滌物出入口 2，並且設有開閉出入口 2的門扇3。又，在外箱1的前面 部的上部設有操作面板4 ’在其裏側設有運轉控制用的控 制裝置5。 在外箱1的內部配設有軸線指向前後方向的橫軸圓筒 狀的水槽6。水槽6是藉由複數（例如左右一對）個懸吊 (在圖2僅以符號7 b表示一方）’在外箱1的底板1 a上 以向前上傾斜的狀態被彈性支撐。此外’關於本實施形態 的懸吊7a、7b的具體的構成容後敘述。 在水槽6的後端側中心部配設有例如由直流無刷直流 馬達形成的馬達8。馬達8是外轉子式者’經由軸承托架 9將安裝在其轉子8 a中心部的未圖示的旋轉軸插到水槽6 的內部，而連結於滾筒1 〇的後端側中央部。 滾筒10配設於水槽6內部’作爲收容洗滌物的洗濯 槽發揮功能。滾筒1 〇是形成軸線指向前後方向的橫軸圓 筒狀，且連結於馬達8的旋轉軸而以與水槽6呈朝同軸狀 的前上傾斜的狀態被支持’滾筒1 0是以馬達8作爲驅動 201247961 手段而被直接驅動。 滾筒1 〇是在整個全區域形成有在其周側部（胴部） 可通水及通風的許多個小孔1 1，另一方面，水槽6是以略 無孔狀構成可貯水。又，滾筒1 0及水槽6是在各自的前 面部具有開口部12及13。 在水槽6的開口部13與洗滌物出入口 2之間安裝有 環狀的波紋管14。藉此，洗滌物出入口 2是經由波紋管 14、水槽6的開口部13、及滾筒10的開口部12連接於滾 筒1 〇的內部。此外，在水槽6的最低部位，經由排水閥 15a連接有排水管15。 在洗衣機，從水槽6的背面側跨到上方及前方配設有 烘乾單元16作爲烘乾手段。該烘乾單元16是由：送風裝 置18;加熱裝置19;以及具備未圖示的除濕手段等的循 環通道17所構成，對從水槽6內被排出的空氣中的水分 進行除濕，接著予以加熱進行回到水槽6內的循環，藉此 ，形成烘乾滾筒10內的洗滌物。 在水槽6的上部的前方部與後方部分別配設有振動感 測器20a、20b (參照圖2、圖4 )。該振動感測器20a、 2 0b皆由例如加速度感測器構成，當滾筒1 0旋轉時有不平 均的時候，形成檢知因其滾筒10的振動造成的水槽6的 振動。 詳細如後述，振動感測器20a、20b與控制裝置5，是 構成作爲檢出滾筒10旋轉時的旋轉週期的同時’檢出水 槽6的振動的手段。 -8- 201247961 接著，針對前述懸吊7a、7b的構成進行說明。 懸吊7a、7b是如圖2所示，具備安裝在外箱1的底 板la側的安裝板21的壓缸裝置30;可上下動地插穿到該 壓缸裝置30內，且上端部被安裝在水槽6側的安裝板6a 的軸件24 ;安裝於該軸件24與壓缸裝置3 0間的線圈彈簧 25 » 壓缸裝置30與軸件24構成本實施形態的阻尼器23， 與線圏彈簧25 —起相對於水槽6呈左右對稱地配設（參 照圖6 ( b ))。藉此，構成將外箱1與水槽6之間連結於 上下方向的左右一對的懸吊7a、7b。 詳細爲，前述壓缸裝置30是如圖3所示，具備有： 呈圓筒狀的鐵製的壓缸22;嵌入該壓缸22的下端部的壓 缸連結部3 0a ;以及配置於壓缸22內部的後述的磁場產生 裝置40等。 經由橡膠等的彈性襯板26等以螺帽27將壓缸連結部 3 0a鎖緊在底板la的安裝板21 (參照圖2)，而將壓缸裝 置30安裝在底板la的安裝板21並予以固定》 另一方面’軸件24具備有：被插入壓缸裝置30的內 部的軸件主部24a ;以及在其上端部呈一體被連結的軸件 連結部24b。軸件24中，至少軸件主部24a是由鐵製的磁 性體構成。 經由橡膠等的彈性襯板28等以螺帽29將軸件連結部 24b鎖緊在水槽6的安裝板6a，而使軸件24作爲追隨水 槽6的振動呈一體在上下方向或左右方向等振動的連結構 201247961 成。 如圖3所示，線圈彈簧2 5是其下端部支撐於壓 置30的上端部，上端部抵接在配置於軸件24上部的圓 狀的彈簧座部49 »藉此，線圈彈簧25是被設成從壓缸 置30朝成爲上方的外方拉出軸件24的彈推的狀態。 將軸件24軸支成可朝上下方向直線往復動的軸承 段33、39在壓缸裝置30的壓缸22內上、下部分開而 配置固定。在被夾在該上下一對的軸承手段33、39的 間部位，收容有磁場產生裝置40及磁性黏性流體等。 下側的軸承手段33，具備有：被收容固定在壓缸 內的上下方向的中間部的軸承保持構件31;以及被收容 定在該軸承保持構件31內的軸承33a。軸承保持構件 是例如由鋁製的非磁性體形成中空筒狀，且在其外周部 有朝周向延伸的溝部3 2。 壓缸22的周壁部是將與溝部32對應的部分以朝內 突出的方式鉚接，而將軸承保持構件31固定在壓缸22 軸承33a是以銅系的非磁性體形成環狀的燒結含油 承。軸承33a嵌合固定在軸承保持構件31的內周部， 構成作爲支撐軸件24可往成爲軸向的上下方向往復動 滑動軸承。 在軸承保持構件31中的軸承33a的上面側壓入保 有1個封止構件38c。此外，在軸件24的下端部安裝有 環34，該擋環34與軸承保持構件31的下面抵接，而限 裝 板 裝 手 被 中 22 固 3 1 具 方 內 軸 而 的 持 擋 制 -10· 201247961 軸件24往上方移動不會脫落。 上側的軸承手段39具備有：被收容固定於壓缸22上 端部的內部的軸承保持構件35;以及被收容固定於該軸承 保持構件35內的軸承39a。軸承保持構件35是例如與下 側的軸承保持構件31同樣，由鋁製的非磁性體形成中空 筒狀。 軸承保持構件35是形成下半部徑大而上半部徑小的 段差形狀，在其徑大筒部35a的外側面，具有被形成在全 周的溝部36。 壓缸22的周壁部，是例如藉由滾軋鉚接，使與前述 溝部36對應的部分朝內方突出，而將軸承保持構件35固 定在壓缸22的上端部。 此外，在溝部3 6安裝有具彈性的〇環3 7。0環3 7 是藉由對溝部3 6進行前述的鉚接保持在緊貼狀態，而形 成確實固定軸承保持構件35，並且防止水往壓缸22內的 浸入。 在軸承保持構件3 5的外周部，形成於徑小筒部3 5 b 與徑大筒部35a的邊界的段差部35c，是支撐線圈彈簧25 的下端部。又，軸承保持構件3 5也作爲相對於線圏彈簧 25的下端內徑從側方將徑小筒部35b的外側面予以保持的 彈簧保持構件發揮功能。 軸承3 9a是與前述的軸承3 3 a同樣，由非磁性體形成 環狀的燒結含油軸承。 在軸承保持構件35的中空內部，除了軸承39a之外 -11 - 201247961 ，壓入保持有位於其下側例如兩個封止構件3 8a 止構件38a、38b及前述的封止構件38c皆在具 的邊緣的橡膠製的本體鑲入成形金屬環的所謂無 封。 前述金屬環是與一般的油封中的鐵製者不同 鋁製的非磁性體構成》 又，軸承保持構件35的內部形狀也形成徑 的段差的中空形狀，在與徑大筒部3 5 a對應的位 內部35d，封止構件38a、38b被壓入而形成上下 軸承保持構件35的中空內部，形成有與徑大內Ϊ 上部連接，而以比此更徑小壓入軸承3 9a的徑小 〇 又，在軸承保持構件3 5形成有更爲徑小的指 ，而形成兼具防止軸承39a往上方的脫落防止的 在該插通孔35f插入有軸件24。 前述磁場產生裝置40具備有：在軸件24周 兩段被配置的捲線軸43U、43D ;捲裝於該等捲 、43D的線圈41U、41D;以及3個軛42a〜42c。 捲線軸43U、43D是在與穿過成爲其中心的 軸件24的外周面之間形成筒狀的間隙。 在捲線軸4 3 U上側及捲線軸4 3 D下側配置有 軛42c’在該等捲線軸43U、捲線軸43D間配置 。軛42a〜42c的中空部，是在與軸件24的外周 具有狹小的間隙（例如0.4 m m左右），而形成與 、38b 。封 有密封用 彈簧的油 ，例如由 尺寸不同 置的徑大 連結。在 部3 5d的 內部3 5 e ，通孔35f 段差部， 圍呈上下 線軸43U 中空部的 軛42a及 有軛42b 面的之間 由前述捲 -12- 201247961 線軸43U、43D所形成的間隙連通朝上下方向延伸的圓筒 狀的間隙。此外，上下的線圈4 1 U、4 1 D互相串聯連接。 磁場產生裝置40是對捲線軸43U、43D捲裝線圈41U ' 41D，並且如上述，在配置軛42a〜42c的狀態下，例如 由熱可塑性樹脂（尼龍、PBT、PET、PP等）進行樹脂鑄 模（圖中，參照樹脂鑄模部44 )。 藉此，磁場產生裝置4 0中的捲線軸4 3 U、4 3 D ;線圈 41U、41D;軛42 a〜42c被一體化。因此，磁場產生裝置 40在軸件24周圍形成有間隙，並且由上下的封止構件 3 8b、38c，封鎖該間隙的上下端部而形成筒狀的收容部50 〇 又，最上部的封止構件3 8a，是將收容部5 0的封鎖狀 態以雙重封鎖而形成可確實的封鎖，並且確實防止來自上 部側滲水。 在前述收容部50收容有磁性黏性流體45，該磁性黏 性流體4 5，是藉由電能量的施加使黏性改變的流體，並依 據磁場（磁場）的強度使黏性特性改變。 該磁性黏性流體4 5，是由例如使鐵、羰基鐵等的強磁 性粒子分散在以聚α -烯烴油作爲主體的基油構成，施加 磁場時，強磁性粒子形成鏈狀的群組而使看起來的黏度具 有上昇的特性。 往該收容部5〇的磁性黏性流體45的供給，是在軸件 24插入有磁場產生裝置40、軸承手段33、39等而形成有 收容部50的狀態下，從未圖示的注入口進行的注入的方 -13- 201247961 式進行。 雖省略詳細的圖示，可是磁性黏性流體4 5，是以例如 佔據收容部50全體的容積的7、8成左右，而剩下的2、3 成爲空氣48 (圖中，以空白表示）的方式被封入。收容部 50中空氣48佔據軸向長度L，是依據脫水運轉的初期（ 後述的共振區域R1)的振動設定成比上下動的軸件24的 衝程更小。 亦即’爲了盡可能產生磁性黏性流體45所爲的減弱 作用，若脫水起動時的振動所爲的軸件24的衝程假設爲 10mm時，則前述軸向長度設定L在l〇mm以下》如此一 來，雖然收容部50本來爲狹小的間隙，可是由於空氣48 佔據其上層部，所以可極力減少磁性黏性流體45的使用 量。 又，隨著水槽6的振動，軸件24由於是超過空氣48 接觸的範圍進行上下動，所以與下層側的磁性黏性流體4 5 接觸成爲可能，即使減量磁性黏性流體4 5，也可促進上述 的減弱作用。 如上述，對軸件24組裝磁場產生裝置40等的狀態下 ，將該等構件連整個軸件24插入到壓缸22的預定位置， 於此狀態，進行壓缸2 2中與各軸承保持構件3 1、3 5的溝 部3 2、3 6對應的部位的鉚接加工》 藉此，一體固定壓缸22內的構件，因而構成壓缸裝 置30。此外，在壓缸裝置30的下部，形成有由連結部 3 0a所閉鎖的空洞部30b，並確保容許往軸件24的下方的 -14- 201247961 移動空間。 又，在該壓缸裝置3 〇裝入線圈彈簧25而組合作爲懸 吊7a、7b。此時，線圈彈簧25是以被壓縮而蓄積著彈發 力的狀態被安裝在軸承保持構件35的段差部35c、與前述 彈簧座部49之間。 如此一來，懸吊7a、7b是如前述，在外箱1的底板 la與水槽6之間的上下方向，在壓缸裝置30位於外箱1 側的狀態下，被配置在水槽6的左右兩側。該懸吊7a、7b 皆是以朝略上下方向延伸的方式被配置，可是嚴格來說， 誇張地進行說明時在正面觀看（參照圖6(b))互相的上 方部間比下方部間更窄，亦即，是以互相的分開距離愈下 側變的愈大的方式傾斜。 軸件24、壓缸22、磁場產生裝置40、磁性黏性流體 45等是構成阻尼器23。 此外，從線圏4 1 U、4 1 D分別所拉出的雨根的導線46 ，是經由設置在壓缸22的襯套47被導出到外部。該導線 46是經由未圖示的驅動電路與控制裝置5連接，而作成可 對磁場產生裝置40的線圈41進行通斷電控制。 圖3中所示的虛線箭頭印A 1 ' A2，是表示隨著對線 圈41U、41D的通電在線圈41U、41D周圍產生的磁性回 路，且是表示其磁場的方向。 又，構成磁性回路Al、A2的軸件24、軛42a〜42c、 壓缸22的各構件，皆是由鐡製的磁性體所形成。 圖4表示電性構成的方塊圖。控制裝置5是以微電腦 -15- 201247961 構成主體，且是控制包含進行滾筒ίο內的洗滌 、脫水、烘乾的洗濯行程〜烘乾行程的洗衣機的 的控制手段。 控制裝置5作爲記憶手段例如具有ROM5 1 a、 及EEPROM5 1C。在R〇M51a記憶有控制洗衣機 運轉等的運轉全體的控制程式、各種數據。 在控制裝置5輸入有：來自由設在操作面板 的操作開關所構成的操作部52的各種操作訊號 知馬達8的旋轉的旋轉感測器53的旋轉檢知訊 檢出水槽6的振動的振動感測器20a、20b的振 號、以及來自檢知流到馬達8的電流的電流感測 電流檢知訊號等。 控制裝置5是依據來自旋轉感測器53的檢 進行馬達8 (滾筒1 0 )的旋轉數除以檢知所要時 ，並依據其演算結果檢知滾筒10的旋轉速度。 裝置5是依據振動感測器20a、20b的檢出値算 振動値），或是依據來自電流感測器54的電流 算出後述的q軸電流。 控制裝置5是向量控制馬達8。在向量控制 樞線圈的電流分離成作爲場磁鐵的永久磁石的磁 與正交於此的方向，並獨立調整該等，控制磁通 矩。 在電流控制雖使用與馬達8的轉子8a —起 標系，所謂由d_q座標系所呈獻的電流値，可是 物的洗濯 動作全體 RAM51b 中的洗濯 4的各種 、來自檢 號、來自 動檢知訊 器54的 知訊號， 間的演算 又，控制 出振幅（ 檢知訊號 將流到電 通方向、 與產生扭 旋轉的座 ，d軸是 -16- 201247961 被安裝在轉子的永久磁石作成的磁通方向，q軸是與d軸 正交的方向。 作爲流到卷線的電流的q軸成分的q軸電流，是使旋 轉扭矩產生的成分（扭矩成分電流），又，作爲流到卷線 的電流的d軸成分的d軸電流是作成磁通的成分（激磁或 磁化成分電流）。 因此，因滾筒10內的洗滌物的偏倚而使偏荷重（亦 即不平均狀態）產生，當其旋轉扭矩變大時q軸電流也變 大。因此，依據q軸電流的大小，可檢知馬達8的扭矩變 動的大小。 於此，圖5表示以洗滌物W偏置在滾筒10內的位置 爲〇度，在正面觀看，滾筒1 〇例如朝順時針方向旋轉之 際的扭矩變動爲兩次旋轉程度（ 3 60度x2)。 在圖5以曲線表示的扭矩，與作用於洗滌物W 的重力的關係上，當滾筒10內的洗滌物W在成爲最上位 置的180度爲最大，洗滌物W在成爲最下位置的360度 (〇度）爲最小。又，扭矩是如圖5所示，由於滾筒10每 一次旋轉以描繪出週期曲線的方式變動，所以可檢出不平 均的相位。 如此，電流感測器54與控制裝置5，是作爲檢出馬達 8的扭矩變動的扭矩變動檢出手段、及檢出滾筒10的旋轉 週期的旋轉週期檢出手段被構成。 而且，控制裝置5是形成依據上述的輸入訊號、檢出 訊號；以及預先被記憶在R〇M51a、EEPROM56C的控制程 -17- 201247961 式及數據，對顯示設定內容等的顯示部55;對水槽6內供 水的供水閥5 6 ;馬達8 ;排水閥1 5 a ;驅動送風裝置1 8的 送風翼1 8a (參照圖1 )的馬達1 8b (參照圖1 )、加熱裝 置19的加熱器19a(參照圖1)、及驅動線圈41U、41D 的驅動電路5 7賦予驅動控制訊號。 再者’如圖1、圖6所示，本實施形態的控制裝置5 ，是對左側的懸吊7a及右側的懸吊7b各別進行可變控制 ，並且執行在滾筒10的每一次旋轉使衰減力增減的週期 性的控制。 具體而言，例如當滾筒1 0朝順時針方向一次旋轉之 際，在左側的懸吊7 a，如圖1 ( a )所示，在不平均的相 位爲〇度〜90度的範圍對線圈41U、41D (以下，僅寫爲 線圈41)通電’在180度〜270度的範圍也對線圈41通 電。在右側的懸吊7b，如圖1 ( b )所示，在不平均的相 位爲90度〜180度的範圍對線圈41通電，在270度〜360 度的範圍也對線圈41。 亦即，控制裝置5是依據來自電流感測器54的電流 檢知訊號，反覆進行滾筒10的每1/4旋轉的ΟΝ/OFF控制 ’使衰減力在左側的懸吊7 a與右側的懸吊7 b交替提昇。 如在以下的作用說明之敘述，藉由該週期性的控制， 可在低速度區域極力提昇振動的抑制效果》 接著’也一面參照圖7、圖8 —面說明上述構成的作 用。 首先，使用者ON操作洗衣機的操作部52的電源開 -18- 201247961 關（未圖式），進行洗濯運轉的設定操作時，控制裝置5 例如依洗濯行程〜烘乾工程的順序執行洗濯運轉。 此外，本實施形態的洗濯運轉，是總稱包含洗濯行程 〜烘乾行程中的任一行程的運轉者，並包含各種的洗濯運 轉。 對懸吊7a、7b的線圈4 1的通電控制，是與在洗濯運 轉中，水槽6的振動變大的期間對應進行設定。在以下， 是以在脫水行程中的加速時，例如從滾筒1 0的旋轉開始 到達穩定旋轉速度爲止，亦即以馬達8的旋轉速度上昇工 程爲例進行說明。 在脫水行程，使馬達8 (滾筒1 〇 )的旋轉速度階段性 地上昇，藉由離心力使殘留於洗滌物的水掙脫排出。在該 旋轉速度上昇工程，尤其圖6(a)中，在由R1表示的區 域，產生水槽6以左右方向爲主體振動的一次共振。 於此，如圖6(b)中模式表示，與水槽6的左右振動 互動，懸吊7a、7b是經由連結於水槽6的軸件24，以本 身的下端部（對前述底板1 a的安裝部分）作爲支點朝左 右搖動。此時’藉由阻尼器23中的磁性黏性流體45的黏 性，相對於軸件24的往復動，賦予摩擦抵抗，並迅速減 弱水槽6的振動振幅。 又，控制裝置5是開始脫水行程時，如圖1所示，對 於左右的懸吊7a、7b’依據來自電流感測器54的電流檢 知訊號，在滾筒10每1/4旋轉交替切換對線圈41的通電 方式反覆進行通電與斷電的控制。 -19- 201247961 對線圈41通電當磁場產生時，在線圏41的周圍形成 有磁性回路Al、A2，磁性黏性流體45的黏度急速提昇， 而使對於軸件24的抵抗增大。 又，此時，如圖1所示，與不平均的相位對應，在滾 筒1 〇 —次旋轉的期間，進行兩次對左側的懸吊7a的線圈 41的ΟΝ/OFF控制，並且，進行兩次對右側的懸吊7b的 線圈41的ΟΝ/OFF控制，而與對該左側的懸吊7a的通電 交替進行通電。 對應滾筒1 〇的旋轉週期性地對這類的可變控制執行 反覆控制，而在懸吊7a、7b，使各阻尼器23的衰減力交 替提昇。如此，在本實施形態，在正面觀看當滾筒1 0朝 順時針方向旋轉之際，以每90度執行交替提高懸吊7a、 7b的各阻尼器23的衰減力的可變控制，而在不平均的相 位爲0度〜90度的範圍，相對提高左側的懸吊7a的衰減 力（參照圖1(a))，並相對降低右側的懸吊7b的衰減 力（參照圖1 ( b ))。 於此，在圖6(a)，以兩點鏈線表示的曲線Sic，是 表示執行週期性的控制時的水槽6的左右方向的振動振幅 °以K線表示的曲線S2，是表示在馬達8的旋轉速度上 昇工程，對雙方的懸吊7a、7b的線圈41持續通電時（參 照圖9)的前述左右方向的振動振幅。 如由圖6(a)可明白，對於水槽6的左右方向的振動 ’ $行了曲線S 1 c的週期的的控制者，不論是否使通電時 尸曰1減半’也可獲得更高的減弱效果（減低效果）。 -20- 201247961 這是可理解關於水槽6的左右方向的振動，與不平均 的相位對應在滾筒1 〇 —次旋轉的期間，進行使阻尼器23 的衰減力改變的可變控制，其抑制效果會提高。 此外’圖中R1表不一次共振區域。 另一方面，在圖7 ( a )，以兩點鏈線表示的曲線S 3 c ，是表示執行週期性的控制時的水槽6的上下方向的振動 振幅。以下側的實線表示的曲線S4，是表示在馬達8的 旋轉速度上昇工程，對雙方的懸吊7a、7b的線圈41U、 41D連續通電時（參照圖9)的前述上下方向的振動振幅 〇 如由圖7(a)可知，關於水槽6的上下方向的振動， 持續高設定各阻尼器23的衰減力的狀態者，可更進一步 抑制作爲其衝程方向的上下方向的振動。而且，該傾向， 隨著滾筒10的旋轉速度提高則愈顯著。 又，在重疊上述的曲線Sic〜S4表示的圖8中，在一 次共振區域R1，水槽6的左右方向的振幅最大，上下方 向的振幅比較小。之後，隨著滾筒10的旋轉速度提高， 左右方向的振幅欲緩慢地降低，另一方面，上下方向的振 幅慢慢增加。 於此，必須有效果地抑制水槽6的左右方向的振動與 上下方向的振動，控制裝置5在圖8，利用以V c所示的 預定的旋轉速度切換懸吊7a、7b的控制模式。 亦即，在ROM5 1 a預先記憶有切換控制模式的預定的 旋轉速度Vc，該旋轉速度Vc是例如被設定在水槽6的左 -21 - 201247961 右方向的共振產生的旋轉速度（參照一次共振區域R1) '與上下方向的共振產生的旋轉速度（參照兩次共振區域 R2 )之間的値。 而且，控制裝置5是依據來自旋轉感測器5 3的檢知 訊號，當判斷滾筒1〇的旋轉速度到達Vc時，從圖1所示 的週期性的控制對雙方的懸吊7a、7b的線圏4 1進行通電 ，並切換成持續其通電狀態的控制（參照圖9)。 如圖8由虛線所示，在水槽6的共振顯現的脫水行程 的一次共振區域R1，控制裝置5執行週期性的通斷電控 制，使實質上的通電時間減半，並可有效抑制左右方向的 振動（參照曲線S 1 c )。 又，當滾筒10的旋轉速度成爲Vc以上時，控制裝置 5是如圖9所示，持續對雙方的懸吊7a、7b的線圈41的 通電。藉此’皆設高各懸吊7a、7b的阻尼器23的衰減力 ，可縮小水槽6的上下方向的振動（參照圖8的曲線S4 )° 如此，即使位於二次共振區域R2以後的高速度區域 (旋轉速度爲Vc以上的速度區域），也可迴避水槽6的 共振的產生’使滾筒1 0旋轉的啓動性能更佳而可上昇到 穩定旋轉速度爲止。 此外’本實施形態中的共振區域是指，在包含共振點 (共振頻率）的共振點附近的區域，一次共振區域R1是 屬於存在於洗衣機的複數個共振點之中的比較低的頻率區 域的共振區域》 -22- 201247961 如以上說明，根據本實施形態中的滾筒式洗衣機’具 備：設在外箱1與水槽6之間，使水槽6的振動減弱的懸 吊7a、7b的阻尼器23;以及可變控制該阻尼器23的衰減 力的控制裝置5，控制裝置5是構成在滾筒10 —次旋轉的 期間，可使阻尼器2 3的衰減力改變，並依滾筒1 0的旋轉 週期性地執行其可變控制的反覆控制。 據此，在洗衣機由於因滾筒10內的洗滌物W的重量 的原因，滾筒10在一次旋轉的期間扭矩變動產生，所以 依其週期使阻尼器23的衰減力改變，而可有效果地抑制 水槽6的振動》 亦即，在滾筒10 —次旋轉的期間進行使衰減力改變 的極細微的控制，而隨著滾筒1 0的旋轉對應週期性的扭 矩變動可提高振動的抑制效果。 此外，在一般的懸吊，爲了支撐水槽，將軸件以成爲 上下方向的方式進行配置，所以對於水槽的上下方向的振 動，雖可期待阻尼器本來的振動減低效果，可是，對於這 以外的振動（左右方向的振動）的振動減低效果並不足夠 這點，如本實施形態，構成從其正面（軸向）觀看水 槽6，具備左右一對的懸吊7a、7b，利用其左右的阻尼器 23執行週期性地控制，也可有效果地抑制水槽6的左右方 向的振動。 又，具備檢出滾筒10的旋轉週期的旋轉週期檢出手 段，控制裝置5是依據以旋轉週期檢出手段所檢出的旋轉 -23- 201247961 週期，執行阻尼器23的週期性的控制。 據此，藉由旋轉週期檢出手段，正確配合不平均的相 位亦即實際的滾筒1 〇的旋轉週期，可使阻尼器23的衰減 力可變。因此可更提高振動、噪音的抑制效果。 此外，旋轉週期檢出手段並不限於電流感測器54、控 制裝置5，如在後述的第2實施形態詳細地說明也可使用 振動感測器20a、20b的構成。 具備檢出使滾筒10旋轉的馬達8及該馬達8的扭矩 變動的扭矩變動檢出手段，控制裝置5是依據由扭矩變動 檢出手段所檢出的扭矩變動的週期，執行阻尼器23的週 期性的控制。 據此，可依據扭矩變動正確掌握不平均的相位，並可 配合實際的滾筒10的旋轉週期使阻尼器23的衰減力可変 。又，使用檢知流到馬達8的電流的電流感測器54構成 扭矩變動檢出手段等，可以比較便宜且作成簡單的構成。 前述控制裝置5,是在水槽6 —次共振發生的低速度 區域（一次共振區域），亦即，水槽6主要在左右方向振 動時，執行阻尼器23的週期性的控制。在比該低速度區 域更高的高速度區域（二次共振區域），亦即，水槽6主 要在上下方向振動時，執行相對提昇阻尼器23的衰減力 的控制。 據此，由於在高速度區域，水槽6的上下方向的振動 變大，所以配合這個相對提高阻尼器23的衰減力，可提 高振動的抑制效果。因此，與依據水槽6的振動的檢出， -24- 201247961 在振動變大的時點，變更控制的構成不同，在低逮度區域 與高速度區域的雙方進行依照水槽6的振動的態樣的@ _ ，而可事先抑制振動的發生。 因此，可將水槽6與外箱1之間的間隙設定的比以前 小，而可謀求外箱1的小型化或使滾筒1 0的容量增力口。 <第2實施形態> 圖10〜圖11(b)表示第2實施形態，在與已說明的 部分的同一部分標示同一符號等，並省略說明，以下針對 不同點進行說明。 圖10表是以洗滌物W配置在滾筒ίο內的位置爲〇 度，當滾筒1 0朝順時針方向旋轉之際的振動感測器20a、 2〇b(參照圖1、圖4)的輸出爲兩次旋轉。亦即，圖1〇 所示的曲線P1D〇是誇張表示不足一次共振時的滾筒10的 旋轉速度的旋轉速度（l〇〇rpm )中的振動感測器20a、 2 0b的輸出，可知輸出曲線Pmo是以與在圖5說明的扭矩 變動同樣的週期進行變化。 更進一步如圖11 (a)所示，滾筒10的旋轉速度爲 lOOrpm時，振動感測器20a、20b的輸出曲線Pl0()描繪出 其變化比前述的扭矩變動的曲線ΤΊ 〇〇更小的緩和的曲線。 如此，振動感測器20a、20b在一次共振發生前的旋轉速 度，由於輸出曲線P i 〇◦的變化也小，所以會有滾筒1 〇的 旋轉週期的檢出困難的虞慮。 而相對於此，圖1 〇所示的曲線Pf，是表示一次共振 -25- 201247961 時的振動感測器20a、20b的輸出，且相位比 或扭矩變動）更遲90度。再者，曲線P20Q是 次共振時的滾筒1〇的旋轉速度的旋轉速度（ 的振動感測器20a、20b的輸出，相位比曲線 矩變動）更遲180度。 此時，如圖11(b)所示，由於滾筒10的 對高，所以振動感測器20a、20b的輸出曲線 也明顯。又，如該圖所示，滾筒10的旋轉速S 的時候，扭矩變動的曲線P2〇〇的變動變小。 總和觀察圖1 〇〜圖1 1 ( b )時，可是滾筒 速度爲lOOrpm的時候，依據利用扭矩變動（ 來自電流感測器5 4的電流檢知訊號，可確實 的相位。 又，滾筒10的旋轉速度爲200 rpm的時候 器20a、20b的輸出曲線P2Q〇雖會產生與不平 移180度的，可是可確實檢出滾筒10的旋轉週 因此，在ROM5 la記憶成爲切換檢出旋轉 段用的指標的旋轉速度（例如振動感測器20a 出相對於前述相位落後1 80度的時點的旋轉速JE 然後，當控制裝置5在旋轉速度上昇工程 旋轉感測器53的檢知訊號，判斷滾筒1 0的旋 發生落後1 8 0度的旋轉速度時，執行從電流感 旋轉週期檢出手段切換到振動感測器20a、20b 此外，滾筒10的旋轉速度爲200rpm時， 曲線P 1 ο 〇 ( 表示超過一 200rpm )中 P1〇o (或扭 旋轉速度相 P 2 0 0的變化 !爲 200rpm 1 〇的旋轉 曲線）T 1 〇 〇 檢知不平均 ，振動感測 均的相位偏 期。 週期用的手 、20b的輸 度）° ，依據來自 轉速度到達 測器54將 的控制。 振動感測器 -26- 201247961 2 0a、2 0b的輸出雖從不平均的相位落後180度，可是 1所示，在1 80度週期進行阻尼器23的可變控制時， 不依據振動感測器20a、20b的輸出演算不平均的相 也可進行與第1實施形態同樣的週期的控制。 如以上’控制裝置5是具備有：成爲扭矩變動檢 段的電流感測器5 4 ;與成爲振動檢出手段的振動感 2 0a、2 0b作爲檢出旋轉週期檢出手段或不平均的相位 段。 而且’在與滾筒1〇的旋轉速度的關係，構成選 的使用成爲輸出的變化大的一方的扭矩變動檢出手段 流感測器5 4、成爲振動檢出手段的振動感測器2 0 a、 。據此’不論滾筒的旋轉速度的變化，可正確檢 平均的相位。 在本實施形態，「週期性的可變控制」是指：不 爲前述ΟΝ/OFF控制者。亦即，以流到線圈41的電 大小作爲大電流I l及小電流I s時，（IL > I s )，亦可 在滾筒10的每一次旋轉反覆週期性地控制大電流 電流Is的通電狀態’來取代反覆控制低速度區域中的 狀態及斷電狀態（參照圖1 ) ^ 又’在高速度區域，只要執行比低速度區域相對 阻尼器23的衰減力控制即可。具體而言，在低速度 ，執行反覆控制在小電流Is的通電狀態及斷電狀態， 速度區域’執行反覆控制在大電流IL的通電狀態及斷 態，可抑制在高速度區域R2的振動、噪音。 如圖 即使 位， 出手 測器 的手 擇性 的電 20b 出不 限定 流的 執行 及小 通電 提昇 區域 在高 電狀 -27- 201247961 其他’懸吊7 a、7 b雖是將各線圈4 1作成上下兩段的 配置’可是例如作成1個的線圈構成等，可有各種的變更 〇 以上’雖說明本發明的幾個實施形態，可是該等的實 施形態是作爲例子所提示者，並沒有意圖限定發明的範圍 。該等新穎的實施形態，可在其他的各式各樣的形態被實 施’在不脫離發明的要旨的，可進行各種的省略、置換、 變更。該等實施形態、其變形，是包含於發明的範圍、要 旨，並且包含於記載於專利申請範圍的發明與其均等的範 圍。 【圖式簡單說明】 [圖1]表示第1實施形態者，且表示滾筒的旋轉週期 與左右的阻尼器的衰減力的關係的圖 [圖2]滾筒式洗衣機的縱剖側視圖 [圖3]懸吊全體的縱剖面圖 [圖4]表示電性構成的方塊圖 [圖5]表示不平均位置的相位與q軸電流的關係的圖 [圖6] (a)是說明滾筒的旋轉數與水槽的左右方向的 振幅的關係用的圖，（b)表示洗衣機中的該左右方向的 振幅的模式圖 [圖7] (a)是說明滾筒的旋轉數與水槽的上下方向的 振幅的關係用的圖，（b)表示洗衣機中的該上下方向的 振幅的模式圖 -28- 201247961 [圖8]說明水槽的左右方向及上下方向的振幅、與控 制模式的切換時機用的圖 [圖9]表示控制模式切換後的阻尼器的衰減力之相當 於圖1的圖 [圖10]表示第2實施形態，表示不平均位置的相位與 振動檢出手段的輸出的關係的模式圖 [圖1 1 ]說明不平均位置的相位與q軸電流及振動檢出 手段的輸出的關係用者，（a)表示滾筒的旋轉爲l〇〇rpm 時，（b)表示滾筒的旋轉爲200rpm之時的狀態的圖 【主要元件符號說明】 1 :外箱 5 :控制手段（旋轉週期檢出手段） 6 :水槽 7a 、 7b :懸吊 10 :滾筒 23 :阻尼器 20a、20b :旋轉週期檢出手段（振動檢出手段••振 動感測器） 54 :旋轉週期檢出手段（扭矩變動檢出手段•·電流 感測器） -29-201247961 VI. Description of the Invention: [Technical Field] The present embodiment relates to a drum type washing machine. [Prior Art] For example, in a drum type washing machine, elastic support is supported by a plurality of suspensions disposed between an outer box and a water tank. The water tank is disposed in the outer tank to reduce the vibration of the water tank as the drum rotates. As a suspension of such a type, a damper having a variable damping force has been considered in recent years, and a magnetic viscous fluid is filled in the damper as a functional fluid (for example, see Patent Document 1). Specifically, for example, the push rod is reciprocally provided in the cylinder, and a piston for generating a magnetic field is disposed on the piston at the tip end of the push rod. Further, a magnetic viscous fluid that accommodates a gap between the outer circumference of the piston and the inner circumference of the cylinder flows. Further, when the water tank vibrates in the up and down direction, the piston and the cylinder relatively vibrate ‘ and the resistance generated by the viscosity of the magnetic viscous fluid imparts a damping force to weaken the vibration of the water tank. Here, when the coil is energized, a magnetic field is generated to apply a magnetic field to the magnetic viscous fluid to increase the viscosity of the magnetic viscous fluid. Thereby, since the resistance between the piston and the cylinder is increased, the relative movement of the piston becomes difficult, so that the damping force becomes large. [PRIOR ART DOCUMENT] [Patent Document] 201247961 [Patent Document 1] JP-A-2000 No. 2 0 5 9 0 6 [Invention] [Problems to be Solved by the Invention] There are a plurality of drum type washing machines. At the resonance point (resonance frequency), when the rotational speed of the drum rises, the water tank mainly generates resonance that vibrates in the vertical direction and resonance that vibrates in the horizontal direction. However, in the conventional drum type washing machine, there is no need to correspond to the vibration of the water tank, and the effect of suppressing vibration and noise by the damper is not sufficient. A drum type washing machine with a damper is available. A drum type washing machine that suppresses vibration and noise more effectively has an object. [Means for Solving the Problem] The drum type washing machine of the present embodiment includes: an outer box; a water tank provided in the outer box; a drum rotatably provided in the water tank; and a space between the outer box and the water tank a damper that attenuates the vibration of the water tank; and a control means that variably controls the damping force of the damper. The control means is a control for changing the damping force of the damper during the rotation of the drum once, and periodically performing the variable control thereof in accordance with the rotation of the drum. In this way, a drum type washing machine that can control the vibration and noise suppression effect while controlling the torque fluctuation in accordance with the periodic rotation of the drum and the damping force to be changed during the rotation of the drum once is performed. -6-201247961 [Embodiment] [Formation for carrying out the invention] <First Embodiment> Hereinafter, a first embodiment will be described with reference to Figs. 1 to 9 . Fig. 2 shows the overall configuration of a drum type washing machine (hereinafter, simply referred to as a washing machine). As shown in the figure, the outer casing 1 has a box shape forming an outer casing of the washing machine, and a laundry inlet and outlet 2 is formed at a central portion of the front side (the right side in the same drawing), and a door leaf 3 for opening and closing the inlet and outlet 2 is provided. Further, an operation panel 4' is provided on the upper portion of the front portion of the outer casing 1, and a control device 5 for operation control is provided on the inner side thereof. A water tank 6 having a horizontal axis and a cylindrical shape whose axis is directed in the front-rear direction is disposed inside the outer casing 1. The water tank 6 is elastically supported by a plurality of (e.g., left and right) suspensions (only one of which is indicated by reference numeral 7 b in Fig. 2) on the bottom plate 1a of the outer casing 1 in a state of being inclined upward. Further, the specific configuration of the suspensions 7a and 7b of the present embodiment will be described later. A motor 8 formed of, for example, a DC brushless DC motor is disposed at the center of the rear end side of the water tank 6. The motor 8 is an outer rotor type. The rotating shaft (not shown) attached to the center portion of the rotor 8a is inserted into the water tank 6 via the bearing bracket 9, and is coupled to the center portion of the rear end side of the drum 1A. The drum 10 is disposed inside the water tank 6 and functions as a washing tank for accommodating laundry. The drum 1 is formed in a cylindrical shape with a horizontal axis in which the axis is directed in the front-rear direction, and is coupled to the rotating shaft of the motor 8 to be supported in a state of being inclined upward toward the front side of the water tank 6. The drum 10 is a motor 8 Drive the 201247961 means and be driven directly. The drum 1 is formed with a plurality of small holes 1 1 through which water can be ventilated and ventilated at the circumferential side portion (the crotch portion). On the other hand, the water tank 6 is configured to store water in a slightly non-porous shape. Further, the drum 10 and the water tank 6 have openings 12 and 13 on the respective front surface portions. An annular bellows 14 is attached between the opening 13 of the water tank 6 and the laundry inlet and outlet 2. Thereby, the laundry inlet/outlet 2 is connected to the inside of the drum 1 through the bellows 14, the opening 13 of the water tank 6, and the opening 12 of the drum 10. Further, a drain pipe 15 is connected to the lowest portion of the water tank 6 via a drain valve 15a. In the washing machine, the drying unit 16 is disposed as a drying means from the back side of the water tank 6 to the upper side and the front side. The drying unit 16 is composed of a blowing device 18, a heating device 19, and a circulation passage 17 including a dehumidifying means (not shown), and dehumidifies moisture in the air discharged from the water tank 6, and then heats it. The circulation back into the water tank 6 is performed, whereby the laundry in the drying drum 10 is formed. Vibration sensors 20a and 20b are disposed in the front portion and the rear portion of the upper portion of the water tank 6, respectively (see Figs. 2 and 4). Each of the vibration sensors 20a, 20b is constituted by, for example, an acceleration sensor, and when the drum 10 is unevenly rotated, the vibration of the water tank 6 due to the vibration of the drum 10 is detected. As will be described in detail later, the vibration sensors 20a and 20b and the control device 5 constitute means for detecting the vibration of the water tank 6 while detecting the rotation period when the drum 10 is rotated. -8-201247961 Next, the configuration of the above-described suspensions 7a and 7b will be described. As shown in FIG. 2, the suspensions 7a and 7b include a cylinder device 30 attached to a mounting plate 21 on the bottom plate 1 side of the outer casing 1, and can be inserted up and down into the cylinder device 30, and the upper end portion is mounted. A shaft member 24 of the mounting plate 6a on the side of the water tank 6; a coil spring 25 attached between the shaft member 24 and the cylinder device 30. The cylinder device 30 and the shaft member 24 constitute the damper 23 of the present embodiment, and the wire The weir spring 25 is disposed symmetrically with respect to the water tank 6 (see FIG. 6(b)). Thereby, a pair of right and left suspensions 7a and 7b that connect the outer casing 1 and the water tank 6 in the vertical direction are formed. Specifically, as shown in FIG. 3, the cylinder device 30 includes a cylinder 22 made of a cylindrical iron, a cylinder connecting portion 30a fitted in a lower end portion of the cylinder 22, and a pressure cylinder. A magnetic field generating device 40 or the like which will be described later inside the cylinder 22. The cylinder connection portion 30a is locked to the mounting plate 21 of the bottom plate 1a (see FIG. 2) via the elastic lining plate 26 of rubber or the like, and the cylinder device 30 is attached to the mounting plate 21 of the bottom plate la and The shaft member 24 is provided with a shaft main portion 24a that is inserted into the inside of the cylinder device 30, and a shaft coupling portion 24b that is integrally coupled at the upper end portion thereof. In the shaft member 24, at least the shaft main portion 24a is made of a magnetic body made of iron. The shaft connecting portion 24b is locked to the mounting plate 6a of the water tank 6 by the nut 29 such as the elastic lining plate 28 such as rubber, and the shaft member 24 is integrally vibrated in the vertical direction or the horizontal direction as the vibration of the following water tank 6. The structure of the building was 201247961. As shown in Fig. 3, the coil spring 25 has its lower end portion supported by the upper end portion of the pressing portion 30, and the upper end portion abuts against a circular spring seat portion 49 disposed at the upper portion of the shaft member 24. Thereby, the coil spring 25 is The state in which the shaft member 24 is pulled out from the cylinder 30 to the upper side is pulled. The bearing segments 33 and 39 which are axially supported by the shaft member 24 so as to be linearly reciprocable in the vertical direction are disposed and fixed in the upper and lower portions of the cylinder 22 of the cylinder device 30. The magnetic field generating device 40, the magnetic viscous fluid, and the like are housed between the pair of upper and lower bearing means 33, 39. The lower bearing means 33 includes a bearing holding member 31 that is housed in the intermediate portion in the vertical direction and fixed in the cylinder, and a bearing 33a that is housed in the bearing holding member 31. The bearing holding member is, for example, a hollow cylindrical body made of a non-magnetic material made of aluminum, and has a groove portion 32 extending in the circumferential direction at the outer peripheral portion thereof. The peripheral wall portion of the cylinder 22 is caulked so that the portion corresponding to the groove portion 32 protrudes inward, and the bearing holding member 31 is fixed to the cylinder 22. The bearing 33a is a sintered oil-containing bearing formed of a copper-based non-magnetic body. . The bearing 33a is fitted and fixed to the inner peripheral portion of the bearing holding member 31, and constitutes a vertically movable reciprocating sliding bearing that can be an axial direction as the support shaft member 24. One sealing member 38c is press-fitted to the upper surface side of the bearing 33a in the bearing holding member 31. Further, a ring 34 is attached to the lower end portion of the shaft member 24, and the retaining ring 34 abuts against the lower surface of the bearing holding member 31, and the limit plate mounting hand is held by the 22-axis inner shaft. 10· 201247961 The shaft member 24 moves upward without falling off. The upper bearing means 39 is provided with a bearing holding member 35 housed and fixed to the inside of the upper end portion of the cylinder 22, and a bearing 39a housed and fixed in the bearing holding member 35. The bearing holding member 35 is formed in a hollow cylindrical shape from a non-magnetic material made of aluminum, for example, similarly to the bearing holding member 31 on the lower side. The bearing holding member 35 has a stepped shape in which the diameter of the lower half is large and the diameter of the upper half is small, and the groove portion 36 is formed on the outer surface of the large-diameter cylindrical portion 35a. The peripheral wall portion of the cylinder 22 protrudes inward from the portion corresponding to the groove portion 36 by, for example, rolling and caulking, and the bearing holding member 35 is fixed to the upper end portion of the cylinder 22. Further, an elastic ring 3 7 is attached to the groove portion 36. The 0 ring 3 7 is held in close contact with the groove portion 36 by the aforementioned caulking, thereby forming a fixed bearing retaining member 35 and preventing water from flowing. Immersion in the cylinder 22. In the outer peripheral portion of the bearing holding member 35, a step portion 35c formed at a boundary between the small-diameter portion 35b and the large-diameter cylindrical portion 35a is a lower end portion that supports the coil spring 25. Further, the bearing holding member 35 also functions as a spring holding member that holds the outer surface of the small diameter cylindrical portion 35b from the side with respect to the inner diameter of the lower end of the coil spring 25. The bearing 39a is a sintered oil-impregnated bearing formed of a non-magnetic material in the same manner as the above-described bearing 3 3 a. In the hollow interior of the bearing holding member 35, in addition to the bearing 39a, -11 - 201247961, the press-in holding is located on the lower side thereof, for example, the two sealing members 38a, the stopper members 38a, 38b, and the aforementioned sealing member 38c are The rubber body of the edge is inserted into the so-called unsealed metal ring. The metal ring is made of a non-magnetic material made of aluminum different from the iron manufacturer in the general oil seal. Further, the inner shape of the bearing holding member 35 also has a hollow shape with a step of a diameter, and corresponds to the large-diameter portion 3 5 a. In the inner portion 35d, the sealing members 38a and 38b are press-fitted to form the hollow interior of the upper and lower bearing holding members 35, and are formed to be connected to the upper portion of the inner diameter of the large diameter, and to be smaller than the diameter of the bearing 39a. Further, the bearing holding member 35 is formed with a finger having a smaller diameter, and the shaft member 24 is inserted into the insertion hole 35f to prevent the bearing 39a from coming off. The magnetic field generating device 40 includes bobbins 43U and 43D arranged in two stages of the shaft member 24, coils 41U and 41D wound around the coils 43D, and three yokes 42a to 42c. The bobbins 43U and 43D form a cylindrical gap between the outer peripheral surface of the shaft member 24 which is formed as a center thereof. A yoke 42c' is disposed between the bobbin 43U and the bobbin 43D on the upper side of the bobbin 4 3 U and the lower side of the bobbin 4 3 D. The hollow portions of the yokes 42a to 42c have a narrow gap (e.g., about 0.4 m) on the outer circumference of the shaft member 24 to form a pair 38b. The oil sealed with the sealing spring is, for example, connected by a large diameter. In the inner portion 3 5 e of the portion 35d, the stepped portion of the through hole 35f, and the gap between the yoke 42a and the yoke 42b surrounding the upper and lower bobbins 43U and the yoke 42b are connected by the gap formed by the aforementioned coil -12-201247961 bobbins 43U, 43D. A cylindrical gap extending in the vertical direction. Further, the upper and lower coils 4 1 U, 4 1 D are connected to each other in series. The magnetic field generating device 40 winds the coils 41U' to 41D to the bobbins 43U and 43D, and as described above, in the state in which the yokes 42a to 42c are disposed, for example, resin molding is performed by a thermoplastic resin (nylon, PBT, PET, PP, etc.). (In the figure, the resin mold portion 44 is referred to). Thereby, the bobbins 4 3 U, 4 3 D in the magnetic field generating device 40; the coils 41U, 41D; and the yokes 42 a to 42c are integrated. Therefore, the magnetic field generating device 40 has a gap formed around the shaft member 24, and the upper and lower end portions of the gap are blocked by the upper and lower sealing members 38b, 38c to form a cylindrical housing portion 50, and the uppermost sealing portion The member 38a is formed such that the blocked state of the accommodating portion 50 is double-blocked to ensure reliable sealing, and the water from the upper side is surely prevented from seeping. The magnetic viscous fluid 45 is accommodated in the accommodating portion 50. The magnetic viscous fluid 45 is a fluid whose viscosity is changed by application of electric energy, and the viscosity characteristic is changed in accordance with the strength of the magnetic field (magnetic field). The magnetic viscous fluid 45 is composed of, for example, a ferromagnetic particle such as iron or carbonyl iron dispersed in a base oil mainly composed of a poly-α-olefin oil, and when a magnetic field is applied, the ferromagnetic particles form a chain group. Make the viscosity of the appearance look like a rising characteristic. The supply of the magnetic viscous fluid 45 to the accommodating portion 5 is a state in which the accommodating portion 50 is formed in the state in which the magnetic field generating device 40, the bearing means 33, 39, and the like are inserted into the shaft member 24, and the inlet is not shown. The infusion is carried out in the manner of -13,479,479. Although the detailed illustration is omitted, the magnetic viscous fluid 45 is, for example, about 7 or 80% of the volume of the entire accommodating portion 50, and the remaining 2 and 3 are air 48 (in the figure, indicated by a blank). The way is enclosed. In the accommodating portion 50, the air 48 occupies the axial length L, and is set to be smaller than the stroke of the vertically moving shaft member 24 in accordance with the vibration at the initial stage of the dehydration operation (the resonance region R1 to be described later). That is, in order to generate the weakening effect of the magnetic viscous fluid 45 as much as possible, if the vibration of the shaft member 24 when the vibration at the start of dehydration is assumed to be 10 mm, the axial length setting L is less than 10 mm. As a result, although the accommodating portion 50 is originally a narrow gap, since the air 48 occupies the upper portion thereof, the amount of the magnetic viscous fluid 45 used can be minimized. Further, with the vibration of the water tank 6, the shaft member 24 moves up and down in a range in which the air member 48 is in contact with the air 48, so that it is possible to contact the magnetic viscous fluid 45 on the lower layer side, even if the magnetic viscous fluid 4 5 is reduced. Promote the above-mentioned weakening effect. As described above, in the state in which the magnetic field generating device 40 or the like is assembled to the shaft member 24, the members are inserted into the predetermined position of the cylinder 22 with the entire shaft member 24, and in this state, the bearing holding member in the cylinder 2 2 is performed. The caulking process of the portion corresponding to the groove portions 3 2, 3 6 of 3 1 and 3 5 means that the member in the cylinder 22 is integrally fixed, thereby forming the cylinder device 30. Further, in the lower portion of the cylinder device 30, a hollow portion 30b that is closed by the joint portion 30a is formed, and a space for the -14-201247961 movement to the lower side of the shaft member 24 is secured. Further, the cylinder device 3 is inserted into the coil unit 3 to be combined as the suspensions 7a and 7b. At this time, the coil spring 25 is attached between the step portion 35c of the bearing holding member 35 and the spring seat portion 49 in a state where the elastic force is accumulated and compressed. In this manner, the suspensions 7a and 7b are disposed in the vertical direction between the bottom plate 1a of the outer casing 1 and the water tank 6, and are disposed on the left and right sides of the water tank 6 in a state where the cylinder device 30 is located on the outer casing 1 side. side. The suspensions 7a and 7b are arranged to extend in the vertical direction, but strictly speaking, when viewed in an exaggerated manner, the front portion is viewed from the front (see FIG. 6(b)). It is narrow, that is, it is inclined in such a manner that the distance from the lower side becomes larger. The shaft member 24, the cylinder 22, the magnetic field generating device 40, the magnetic viscous fluid 45, and the like constitute the damper 23. Further, the wire 46 of the rain root pulled out from the turns 4 1 U, 4 1 D, respectively, is led out to the outside via the bush 47 provided in the cylinder 22. The lead wire 46 is connected to the control device 5 via a drive circuit (not shown), and is configured to perform on-off control of the coil 41 of the magnetic field generating device 40. The dotted arrow mark A 1 ' A2 shown in Fig. 3 indicates the magnetic circuit generated around the coils 41U, 41D with energization of the coils 41U, 41D, and indicates the direction of the magnetic field. Further, the shaft members 24, the yokes 42a to 42c, and the members of the cylinders 22 constituting the magnetic circuits A1 and A2 are each formed of a magnetic body made of tantalum. Fig. 4 is a block diagram showing an electrical configuration. The control device 5 is a main body of the microcomputer -15-201247961, and is a control means for controlling the washing machine including the washing stroke to the drying stroke for washing, dehydrating, and drying in the drum ίο. The control device 5 has, as a memory means, for example, a ROM 5 1 a and an EEPROM 5 1C. In the R〇M51a, there are various control programs and various data for controlling the operation of the washing machine. In the control device 5, the vibration of the vibration sensor 53 detecting the rotation of the motor 8 from the various operation signals of the operation unit 52 provided in the operation unit 52 of the operation panel of the operation panel is detected. The vibration numbers of the sensors 20a and 20b and the current sensing current detection signals and the like from the currents detecting the flow to the motor 8. The control device 5 divides the number of rotations of the motor 8 (the drum 10) by the detection from the rotation sensor 53 by the time required for the detection, and detects the rotation speed of the drum 10 based on the calculation result. The device 5 calculates the vibration 値 according to the detection of the vibration sensors 20a and 20b, or calculates the q-axis current to be described later based on the current from the current sensor 54. The control device 5 is a vector control motor 8. In the vector control, the current of the pivot coil is separated into the magnetic field of the permanent magnet as the field magnet and the direction orthogonal thereto, and the magnetic flux is controlled independently. In the current control, the current is generated by the rotor 8a of the motor 8, and the current is generated by the d_q coordinate system. However, the washing operation of the entire RAM 51b of the object is performed, and the automatic detection is performed from the inspection number. The calculation of the signal of the device 54 and the calculation of the amplitude (the detection signal will flow to the direction of the electric flux, and the seat that generates the torsion rotation, the d-axis is the magnetic flux direction of the permanent magnet of the rotor mounted on the rotor -16-201247961) The q-axis is a direction orthogonal to the d-axis. The q-axis current of the q-axis component of the current flowing to the winding is a component (torque component current) that causes the rotational torque, and is a current flowing to the winding. The d-axis current of the d-axis component is a component of the magnetic flux (excitation or magnetization component current). Therefore, the bias load (that is, the uneven state) is generated due to the bias of the laundry in the drum 10, and the rotational torque thereof is generated. When the voltage increases, the q-axis current also increases. Therefore, the magnitude of the torque fluctuation of the motor 8 can be detected based on the magnitude of the q-axis current. Here, FIG. 5 shows that the position of the laundry W biased in the drum 10 is 〇 Degree, in positive When viewed from the surface, the torque fluctuation of the drum 1 〇, for example, in the clockwise direction is twice the degree of rotation (3 60 degrees x 2). The torque indicated by the curve in Fig. 5 is related to the gravity acting on the laundry W, When the laundry W in the drum 10 is at a maximum of 180 degrees which is the uppermost position, the laundry W is minimized at 360 degrees (twist) which becomes the lowermost position. Again, the torque is as shown in FIG. Since the one-rotation changes in such a manner that the periodic curve is drawn, the uneven phase can be detected. Thus, the current sensor 54 and the control device 5 are the torque fluctuation detecting means for detecting the torque fluctuation of the motor 8, and the detection. A rotation period detecting means for rotating the drum 10 is formed. Further, the control unit 5 forms an input signal according to the above, a detection signal, and a control path -17-201247961 which is previously stored in R〇M51a and EEPROM56C. And data, a display unit 55 for displaying setting contents, etc.; a water supply valve 56 for supplying water into the water tank 6, a motor 8; a drain valve 15a; and a motor for driving the air blowing blade 18a (see Fig. 1) of the air blowing device 18. 1 8b (refer to Figure 1) The heater 19a of the heating device 19 (see Fig. 1) and the drive circuit 57 of the drive coils 41U and 41D are given drive control signals. Further, as shown in Figs. 1 and 6, the control device 5 of the present embodiment is The suspension 7a on the left side and the suspension 7b on the right side are separately variably controlled, and periodic control of increasing or decreasing the damping force at each rotation of the drum 10 is performed. Specifically, for example, when the drum 10 is facing upward When the hour hand rotates once, the suspension 7 a on the left side, as shown in Fig. 1 (a), the coil 41U, 41D in the range where the uneven phase is 〜 degrees to 90 degrees (hereinafter, only written as the coil 41) The energization 'energizes the coil 41 also in the range of 180 degrees to 270 degrees. In the suspension 7b on the right side, as shown in Fig. 1 (b), the coil 41 is energized in a range in which the uneven phase is 90 to 180 degrees, and the coil 41 is also in the range of 270 to 360 degrees. That is, the control device 5 repeats the ΟΝ/OFF control of every 1/4 rotation of the drum 10 in accordance with the current detection signal from the current sensor 54. The damping force is suspended on the left side 7 a and the right side is suspended. Hang 7 b alternately lifted. As described in the following description of the operation, the suppression effect of the vibration can be increased as much as possible in the low-speed region by the periodic control. Next, the above-described configuration will be described with reference to Figs. 7 and 8 . First, when the user turns on the power of the operation unit 52 of the washing machine to turn on the power supply -18-201247961 (not shown), and performs the setting operation of the washing operation, the control device 5 executes the washing operation in the order of the washing course to the drying process, for example. Further, the washing operation of the present embodiment is generally referred to as an operator including any one of the washing stroke to the drying stroke, and includes various washing operations. The energization control of the coils 4 1 of the suspensions 7a and 7b is set in accordance with the period during which the vibration of the water tank 6 is increased during the washing operation. Hereinafter, the acceleration in the dehydration step, for example, from the rotation of the drum 10 to the steady rotation speed, that is, the rotation speed increase of the motor 8 will be described as an example. In the dehydration stroke, the rotational speed of the motor 8 (roller 1 〇 ) is gradually increased, and the water remaining in the laundry is released by centrifugal force. In the rotation speed increase project, in particular, in Fig. 6(a), in the region indicated by R1, the primary resonance in which the water tank 6 vibrates mainly in the left-right direction is generated. Here, as shown in the pattern of Fig. 6(b), the left and right vibrations of the water tank 6 interact with each other, and the suspensions 7a and 7b are connected to the shaft member 24 of the water tank 6, and the lower end portion thereof is attached to the bottom plate 1a. Part) Shake it to the left and right as a fulcrum. At this time, by the viscosity of the magnetic viscous fluid 45 in the damper 23, frictional resistance is imparted to the reciprocating motion of the shaft member 24, and the vibration amplitude of the water tank 6 is quickly weakened. Further, when the control device 5 starts the dehydration stroke, as shown in Fig. 1, the left and right suspensions 7a, 7b' are alternately switched every 1/4 rotation of the drum 10 in accordance with the current detection signal from the current sensor 54. The energization of the coil 41 repeatedly controls the energization and de-energization. -19- 201247961 When the magnetic field is generated, magnetic circuits A1 and A2 are formed around the wire 41, and the viscosity of the magnetic viscous fluid 45 is rapidly increased to increase the resistance to the shaft member 24. Further, at this time, as shown in FIG. 1, in accordance with the uneven phase, the ΟΝ/OFF control of the coil 41 of the suspension 7a on the left side is performed twice during the period of the first rotation of the drum 1, and two The ΟΝ/OFF control of the coil 41 of the suspension 7b on the right side is alternately performed, and the energization of the suspension 7a on the left side is alternately energized. The rotation of the corresponding drum 1 周期性 periodically performs repeated control of such variable control, and in the suspensions 7a, 7b, the damping forces of the respective dampers 23 are alternately increased. As described above, in the present embodiment, when the drum 10 is rotated in the clockwise direction, the variable control for alternately increasing the damping force of each of the dampers 23 of the suspensions 7a and 7b is performed every 90 degrees. The average phase is in the range of 0 to 90 degrees, and the damping force of the suspension 7a on the left side is relatively increased (refer to FIG. 1(a)), and the damping force of the suspension 7b on the right side is relatively lowered (refer to FIG. 1(b)). . Here, in FIG. 6(a), a curve Sic indicated by a two-dot chain line is a curve S2 indicated by a K line in the left-right direction of the water tank 6 when the periodic control is executed, and is shown in the motor. The rotation speed of 8 is increased, and the vibration amplitude in the left-right direction when the coils 41 of the suspensions 7a and 7b are continuously energized (see FIG. 9). As can be understood from Fig. 6(a), the controller of the period of the curve S 1 c for the vibration of the water tank 6 in the left-right direction can obtain a higher degree regardless of whether or not the corpse 1 is halved at the time of energization. Attenuate the effect (reduce the effect). -20-201247961 This is a variable control in which the damping force of the damper 23 is changed during the period of the drum 1 〇-rotation corresponding to the uneven phase, and the suppression effect is suppressed. Will improve. In addition, R1 does not represent a resonance region. On the other hand, in Fig. 7(a), the curve S 3 c indicated by the two-dot chain line indicates the vibration amplitude in the vertical direction of the water tank 6 when the periodic control is executed. The curve S4 indicated by the solid line on the lower side is the vibration amplitude in the vertical direction when the rotation speed of the motor 8 is increased, and the coils 41U and 41D of the suspensions 7a and 7b are continuously energized (see FIG. 9). As can be seen from Fig. 7(a), in the state in which the vibration of the vertical direction of the water tank 6 is continuously set to the damping force of each damper 23, the vibration in the vertical direction as the stroke direction can be further suppressed. Moreover, this tendency becomes more remarkable as the rotational speed of the drum 10 increases. Further, in Fig. 8 in which the above-described curved lines Sic to S4 are superimposed, in the primary resonance region R1, the amplitude of the water tank 6 in the horizontal direction is the largest, and the amplitude in the upper and lower directions is relatively small. Thereafter, as the rotational speed of the drum 10 increases, the amplitude in the left-right direction is gradually lowered, and on the other hand, the amplitude in the vertical direction is gradually increased. Here, it is necessary to effectively suppress the vibration in the left-right direction of the water tank 6 and the vibration in the vertical direction, and the control device 5 switches the control modes of the suspensions 7a and 7b at a predetermined rotational speed indicated by Vc in Fig. 8 . That is, the predetermined rotational speed Vc of the switching control mode is previously stored in the ROM 5 1 a, and the rotational speed Vc is, for example, a rotational speed generated by resonance in the right direction of the left side of the water tank 6 - 201247961 (refer to the primary resonance region). R1) '値 between the rotational speed generated by the resonance in the vertical direction (see the two resonance regions R2). Further, the control device 5 is based on the detection signal from the rotation sensor 53. When it is judged that the rotation speed of the drum 1〇 reaches Vc, the periodic control shown in Fig. 1 is applied to both suspensions 7a, 7b. The coil 41 is energized and switched to control that continues its energization state (refer to Fig. 9). As shown by a broken line in Fig. 8, in the primary resonance region R1 of the dehydration stroke in which the resonance of the water tank 6 appears, the control device 5 performs periodic on/off control to halve the substantial energization time, and can effectively suppress the left and right direction. Vibration (refer to curve S 1 c ). When the rotational speed of the drum 10 is equal to or higher than Vc, the control device 5 continues to energize the coils 41 of the suspensions 7a and 7b as shown in Fig. 9 . By this, the damping force of the damper 23 of each of the suspensions 7a and 7b is set to reduce the vibration of the water tank 6 in the vertical direction (see the curve S4 of FIG. 8). Thus, even after the second resonance region R2 is high. In the speed region (the speed region in which the rotation speed is Vc or more), the generation of the resonance of the water tank 6 can be avoided. The starting performance of the rotation of the drum 10 is further improved and the rotation speed can be increased. Further, the resonance region in the present embodiment means a region in the vicinity of the resonance point including the resonance point (resonance frequency), and the primary resonance region R1 is a relatively low frequency region belonging to a plurality of resonance points existing in the washing machine. Resonance area -22-201247961 As described above, the drum type washing machine of the present embodiment includes: a damper 23 provided between the outer box 1 and the water tank 6, and the suspensions 7a, 7b which weaken the vibration of the water tank 6; And a control device 5 that variably controls the damping force of the damper 23, the control device 5 is configured to change the damping force of the damper 23 during the first rotation of the drum 10, and to periodically rotate according to the rotation of the drum 10. Perform repeated control of its variable control. According to this, in the washing machine, the torque of the drum 10 is generated during the one rotation due to the weight of the laundry W in the drum 10, so that the damping force of the damper 23 is changed in accordance with the cycle, and the water tank can be effectively suppressed. That is, the vibration of 6 is extremely finely controlled while the drum 10 is rotated once, and the vibration suppressing effect is improved in accordance with the periodic torque fluctuation in accordance with the rotation of the drum 10. In addition, in the general suspension, in order to support the water tank, the shaft member is disposed in the vertical direction. Therefore, the vibration vibration in the vertical direction of the water tank is expected to be the same as the original vibration reduction effect of the damper. In the present embodiment, the water tank 6 is viewed from the front side (axial direction), and includes a pair of right and left suspensions 7a and 7b, and the right and left damping is used. The device 23 performs periodic control, and can also effectively suppress the vibration of the water tank 6 in the left-right direction. Further, the rotation period detecting means for detecting the rotation period of the drum 10 is provided, and the control device 5 performs the periodic control of the damper 23 in accordance with the rotation -23 - 201247961 period detected by the rotation period detecting means. According to this, the damping force of the damper 23 can be made variable by the rotation period detecting means, by correctly matching the uneven phase, that is, the actual rotation period of the drum 1 。. Therefore, the suppression effect of vibration and noise can be further improved. Further, the rotation period detecting means is not limited to the current sensor 54 and the control device 5. As described in detail in the second embodiment to be described later, the vibration sensors 20a and 20b may be used. The motor 8 for detecting the rotation of the drum 10 and the torque fluctuation detecting means for the torque fluctuation of the motor 8 are provided. The control device 5 executes the cycle of the damper 23 in accordance with the cycle of the torque fluctuation detected by the torque fluctuation detecting means. Sexual control. According to this, the uneven phase can be correctly grasped according to the torque variation, and the damping force of the damper 23 can be made commensurate with the actual rotation period of the drum 10. Further, the current sensor 54 for detecting the current flowing to the motor 8 constitutes a torque fluctuation detecting means or the like, and can be made relatively inexpensive and has a simple configuration. The control device 5 performs periodic control of the damper 23 when the water tank 6 is mainly vibrated in the left-right direction in the low-speed region (primary resonance region) where the secondary resonance occurs. The control of the damping force with respect to the lift damper 23 is performed in a high speed region (secondary resonance region) higher than the low speed region, that is, when the water tank 6 mainly vibrates in the up and down direction. According to this, since the vibration in the vertical direction of the water tank 6 is increased in the high speed region, the damping effect of the damper 23 can be increased to increase the vibration suppressing effect. Therefore, in the case where the vibration of the water tank 6 is detected, the configuration of the change control is different at the time when the vibration is increased, and the vibration of the water tank 6 is performed in both the low-hazard region and the high-speed region. @ _ , and the occurrence of vibration can be suppressed in advance. Therefore, the gap between the water tank 6 and the outer casing 1 can be set smaller than before, and the size of the outer casing 1 can be reduced or the capacity of the drum 10 can be increased. <Second Embodiment> Fig. 10 to Fig. 11(b) show the second embodiment, and the same portions as those of the same portions are denoted by the same reference numerals, and the description thereof will be omitted. Fig. 10 is an output of the vibration sensors 20a, 2b (see Figs. 1, 4) when the position of the laundry W is arranged in the drum ίο, when the drum 10 is rotated clockwise. It is rotated twice. That is, the curve P1D shown in FIG. 1A is an output of the vibration sensors 20a and 20b exaggerated in the rotational speed (10 rpm) indicating the rotational speed of the drum 10 at the time of less than one resonance, and the output curve is known. Pmo is changed in the same cycle as the torque variation explained in FIG. Further, as shown in Fig. 11 (a), when the rotational speed of the drum 10 is 100 rpm, the output curve P10 () of the vibration sensors 20a, 20b depicts that the change is smaller than the aforementioned curve of the torque variation ΤΊ 〇〇 A gentle curve. As described above, the rotational speeds of the vibration sensors 20a and 20b before the occurrence of the primary resonance are small because the change in the output curve P i 也 is small, so that it is difficult to detect the rotation period of the drum 1 。. On the other hand, the curve Pf shown in Fig. 1A indicates the output of the vibration sensors 20a and 20b at the time of the primary resonance -25-201247961, and the phase ratio or the torque variation is 90 degrees later. Further, the curve P20Q is the rotational speed of the rotational speed of the drum 1〇 at the time of the secondary resonance (the output of the vibration sensors 20a and 20b, and the phase is shifted from the curve moment) by 180 degrees. At this time, as shown in Fig. 11 (b), since the pair of rollers 10 is high, the output curves of the vibration sensors 20a, 20b are also conspicuous. Further, as shown in the figure, when the rotational speed S of the drum 10 is changed, the fluctuation of the curve P2 of the torque fluctuation becomes small. When the total is observed in Fig. 1 图 to Fig. 1 1 (b), when the drum speed is 100 rpm, the torque can be varied (the current detection signal from the current sensor 54 can be sure of the phase. When the rotation speed is 200 rpm, the output curve P2Q of the devices 20a and 20b is generated and not shifted by 180 degrees, but the rotation circumference of the drum 10 can be surely detected. Therefore, the ROM 5 la memory is used for switching the detection rotation segment. The rotational speed of the index (for example, the rotational speed JE at which the vibration sensor 20a is delayed by 180 degrees with respect to the aforementioned phase. Then, when the control device 5 raises the detection signal of the rotational sensor 53 at the rotational speed, the drum 1 is judged. When the rotation of 0 is delayed by 180 degrees, the switching from the current sense rotation period detecting means to the vibration sensors 20a, 20b is performed. Further, when the rotation speed of the drum 10 is 200 rpm, the curve P 1 ο 〇 More than one 200 rpm) P1〇o (or a change in the twisting speed phase P 2 0 0! A rotation curve of 200 rpm 1 )) T 1 〇〇 Undetected unevenness, phase shift of vibration sensing. hand , 20b transmission) °, according to the control from the speed of arrival to the detector 54. Vibration sensor -26- 201247961 2 0a, 20 0b output from the uneven phase behind 180 degrees, but 1 shows When the variable control of the damper 23 is performed in the period of 180 degrees, the phase control can be performed in the same manner as in the first embodiment without calculating the uneven phase based on the outputs of the vibration sensors 20a and 20b. 5 is a current sensor 5 that is a torque fluctuation detecting section; and a vibration feeling 20a, 20b which is a vibration detecting means is used as a detection rotation period detecting means or an uneven phase section. The relationship between the rotation speed of the drum and the rotation speed of the drum 1 is a torque fluctuation detecting means that is used to change the output, and the vibration sensor 50 as a vibration detecting means. 'The average phase can be accurately detected regardless of the change in the rotational speed of the drum. In the present embodiment, the "periodic variable control" means that the ΟΝ/OFF controller is not provided. That is, the flow to the coil 41 is performed. Electrical size as a large current I l and the small current I s, (IL > I s ), can also periodically control the energization state of the large current Is in each rotation of the drum 10 instead of repeatedly controlling the state in the low speed region and Electrical state (refer to FIG. 1) ^ In the high speed region, it is only necessary to perform the damping force control of the damper 23 with respect to the low speed region. Specifically, at a low speed, the power supply state of the small current Is is repeatedly controlled. In the power-off state, the speed region 'executely controls the energization state and the off state of the large current IL, and the vibration and noise in the high-speed region R2 can be suppressed. As shown in the figure, the hand-selective electric 20b of the hand detector does not limit the execution of the flow and the small energization lifting area is in the high electric state -27- 201247961 other 'suspension 7 a, 7 b although the coil 4 1 In the arrangement of the upper and lower stages, for example, one coil configuration may be used, and various modifications may be made. The embodiments of the present invention are described as examples. It is intended to limit the scope of the invention. The present invention may be embodied in various other forms and various modifications, substitutions and changes can be made without departing from the scope of the invention. The embodiments and the modifications thereof are included in the scope and the gist of the invention, and are included in the scope of the invention described in the scope of the patent application. [Fig. 1] Fig. 1 is a view showing a relationship between a rotation period of a drum and a damping force of a right and left damper in the first embodiment. Fig. 2 is a longitudinal sectional side view of the drum type washing machine [Fig. 3] Fig. 4 is a block diagram showing the relationship between the phase of the uneven position and the q-axis current. Fig. 5 (a) is a diagram showing the number of rotations of the drum. (b) is a diagram showing the relationship between the amplitude of the left and right direction of the water tank, and (b) is a schematic diagram showing the amplitude of the left and right direction in the washing machine. [Fig. 7] (a) is a relationship between the number of rotations of the drum and the amplitude of the vertical direction of the water tank. (b) is a diagram showing the amplitude of the vertical direction in the washing machine. Fig. 28 - 201247961 [Fig. 8] A diagram for explaining the amplitude of the horizontal direction and the vertical direction of the water tank and the switching timing of the control mode [Fig. 9] FIG. 1 is a view showing a relationship between the damping force of the damper after the control mode switching, and FIG. 1 is a schematic view showing the relationship between the phase of the uneven position and the output of the vibration detecting means in the second embodiment [FIG. 1] 1] Describe the phase of the uneven position and the q-axis current and vibration (a) shows a state in which the rotation of the drum is l〇〇 rpm, and (b) shows a state in which the rotation of the drum is 200 rpm [Description of main components] 1 : outer case 5 : Control means (rotation cycle detection means) 6 : Water tank 7a, 7b : Suspension 10 : Roller 23 : Damper 20a, 20b : Rotation period detection means (vibration detection means • Vibration sensor) 54 : Rotation period detection means (torque change detection means • current sensor) -29-