TWI774428B - 電磁鋼板用塗覆組成物、電磁鋼板、積層鐵芯及旋轉電機 - Google Patents
電磁鋼板用塗覆組成物、電磁鋼板、積層鐵芯及旋轉電機 Download PDFInfo
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- TWI774428B TWI774428B TW110122211A TW110122211A TWI774428B TW I774428 B TWI774428 B TW I774428B TW 110122211 A TW110122211 A TW 110122211A TW 110122211 A TW110122211 A TW 110122211A TW I774428 B TWI774428 B TW I774428B
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- steel sheet
- electromagnetic steel
- coating composition
- elastomer
- insulating film
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Abstract
本發明之用於積層鐵芯之電磁鋼板為於母材鋼板表面具有絕緣被膜之電磁鋼板,該絕緣被膜係塗佈電磁鋼板用塗覆組成物而形成者,前述電磁鋼板用塗覆組成物含有環氧樹脂、環氧樹脂硬化劑及彈性體改質酚樹脂,並且前述彈性體改質酚樹脂之含量相對於前述環氧樹脂100質量份為10質量份以上且100質量份以下。
Description
本發明有關電磁鋼板用塗覆組成物、電磁鋼板、積層鐵芯及旋轉電機。本案係依據已於2020年6月17日於日本提申之日本特願2020-104254號主張優先權,並於此援引其內容。
作為使用於旋轉電機之鐵芯(鐵心),已知一種以互相接合方式積層有複數片電磁鋼板之積層鐵芯。作為接合電磁鋼板彼此之方法,已知歛合或熔接。然而,在歛合或熔接中,容易因加工時的機械應變或熱應變造成電磁鋼板之磁特性(鐵芯鐵損)劣化。
作為歛合、熔接以外的接合方法,例如已知一種使於表面形成有具接著能力之絕緣被膜的電磁鋼板互相接著的方法(專利文獻1)。由於運用了前述絕緣被膜之接著並未賦予機械應變或熱應變,故相較於歛合或熔接,鐵芯鐵損較優異。環氧樹脂的體積變化少,且耐熱性、耐油性及耐藥品性優異,作為將電磁鋼板彼此接著之接著劑十分優異(專利文獻2、3)。
先前技術文獻
專利文獻
專利文獻1:日本專利特開2017-011863號公報
專利文獻2:日本專利特開2000-173816號公報
專利文獻3:國際公開第2004/070080號
發明欲解決之課題
近年來,受到進一步提升馬達效率之訴求,而要求更減低鐵芯鐵損。在減低鐵芯鐵損上,電磁鋼板之薄化為可期作法。然而,鋼板的楊氏模數會隨著板厚減少而降低,因此要求不對鋼板賦予會成為鐵損劣化之原因的應力應變。環氧樹脂的耐熱性優異,但堅硬且韌性低,所以會因接著時的硬化而對鋼板賦予應力應變,因此若鋼板變薄則會成為鐵損劣化的原因。
另外,電動汽車之驅動馬達等在驅動中會變得高溫,故而要求更進一步的耐熱性。
作為提升耐熱性的手法有摻混酚樹脂之方法。但是,耐熱性優異之樹脂在常溫下很堅硬,會對積層鐵芯賦予巨大的應力,因此會使磁特性劣化。另一方面,在常溫附近呈適當硬度之樹脂在高溫下會變得柔軟,故耐熱性差。基於該等情事,難以兼顧優異磁特性與即便在驅動時曝露於高溫下之狀態下仍可維持充分的接著強度之優異耐熱性。
本發明之目的在於提供一種電磁鋼板用塗覆組成物、使用其之電磁鋼板、積層鐵芯及旋轉電機,該電磁鋼板用塗覆組成物可兼顧積層鐵芯之磁特性與即便在驅動時之高溫狀態下仍可維持電磁鋼板彼此之接著強度的耐熱性。
用以解決課題之手段
本發明具有以下態樣。
[1]本發明一態樣之電磁鋼板用塗覆組成物含有:環氧樹脂、環氧樹脂硬化劑及彈性體改質酚樹脂,並且,前述彈性體改質酚樹脂之含量相對於前述環氧樹脂100質量份為10質量份以上且100質量份以下。
[2]如上述[1]之電磁鋼板用塗覆組成物,其中彈性體改質酚樹脂之彈性體部的重量平均分子量亦可為2000以上且200000以下。
[3]如上述[1]或[2]之電磁鋼板用塗覆組成物,其硬化收縮率亦可為15%以下。
[4]本發明一態樣之電磁鋼板於表面具有包含如上述[1]~[3]中任一項之電磁鋼板用塗覆組成物的絕緣被膜。
[5]本發明一態樣之積層鐵芯係積層有複數片如上述[4]之電磁鋼板且其等互相接著者。
[6]本發明一態樣之旋轉電機具備如上述[5]之積層鐵芯。
發明效果
根據本發明之上述態樣,可提供一種電磁鋼板用塗覆組成物、使用其之電磁鋼板、積層鐵芯及旋轉電機,該電磁鋼板用塗覆組成物可兼顧積層鐵芯之磁特性與即便在驅動時之高溫狀態下仍可維持電磁鋼板彼此之接著強度的耐熱性。
用以實施發明之形態
以下,參照圖式來說明本發明一實施形態之積層鐵芯、具備該積層鐵芯之旋轉電機及形成該積層鐵芯之胚料。又,在本實施形態中,作為旋轉電機係舉電動機,具體而言係交流電動機,更具體而言係同步電動機,再更具體而言係舉永久磁鐵磁場型電動機為一例來說明。此種電動機譬如適合被採用於電動汽車等。
又,以下在夾著「~」而記載之數值限定範圍中,下限值及上限值係包含在該範圍內。顯示為「小於」或「大於」的數值,該值不包含在數值範圍內。
(旋轉電機10)
如圖1所示,旋轉電機10具備定子20、轉子30、罩殼50及旋轉軸60。定子20及轉子30容置於罩殼50內。
並且,定子20固定於罩殼50內。
在本實施形態中,旋轉電機10採用了轉子30位於定子20之直徑方向內側的內轉子型。然而,旋轉電機10亦可採用轉子30位於定子20之外側的外轉子型。又,在本實施形態中,旋轉電機10為12極18槽的三相交流馬達。惟,極數、槽數及相數等可適當變更。
旋轉電機10例如藉由對各相施加有效值10A、頻率100Hz之激磁電流,而能以轉數1000rpm旋轉。
定子20具備定子用接著積層鐵芯(以下稱為定子鐵芯)21與未圖示之繞線。
定子鐵芯21具備環狀的芯背部22與複數個齒部23。以下,將定子鐵芯21(或芯背部22)之中心軸線O方向稱為軸方向,將定子鐵芯21(或芯背部22)之直徑方向(與中心軸線O正交的方向)稱為直徑方向,且將定子鐵芯21(或芯背部22)之圓周方向(在中心軸線O周圍環繞的方向)稱為圓周方向。
在從軸方向觀看定子20的俯視視角下,芯背部22係形成為圓環狀。
複數個齒部23係從芯背部22之內周朝向直徑方向內側(沿著直徑方向朝向芯背部22之中心軸線O)突出。並且,複數個齒部23係在圓周方向上空出同等角度間隔來配置。在本實施形態中,按以中心軸線O為中心之中心角20度為間隔,設置有18個齒部23。複數個齒部23被形成為互為同等形狀且同等大小。藉此,複數個齒部23互相具有相同的厚度尺寸。
前述繞線被捲繞於齒部23。前述繞線可呈集中捲繞,亦可呈分佈捲繞。
轉子30相對於定子20(定子鐵芯21)係配置於直徑方向的內側。轉子30具備轉子鐵芯31與複數個永久磁鐵32。
轉子鐵芯31係形成為環狀(圓環狀),該環狀(圓環狀)配置成與定子20同軸。在轉子鐵芯31內配置有前述旋轉軸60。旋轉軸60被固定於轉子鐵芯31。
複數個永久磁鐵32被固定於轉子鐵芯31。在本實施形態中,2個1組的永久磁鐵32會形成1個磁極。複數組永久磁鐵32係在圓周方向上空出同等角度間隔來配置。在本實施形態中,按以中心軸線O為中心之中心角30度為間隔,設置有12組(全體為24個)永久磁鐵32。
在本實施形態中,永久磁鐵磁場型電動機採用了磁鐵埋入型馬達。
於轉子鐵芯31形成有在軸方向上貫通轉子鐵芯31之複數個貫通孔33。複數個貫通孔33係對應複數個永久磁鐵32之配置來設置。各永久磁鐵32係在配置於對應之貫通孔33內的狀態下被固定於轉子鐵芯31。將各永久磁鐵32固定到轉子鐵芯31這點,例如可藉由以接著劑接著永久磁鐵32之外表面與貫通孔33之內表面等來實現。另外,永久磁鐵磁場型電動機亦可取代磁鐵埋入型而採用表面磁鐵型馬達。
定子鐵芯21及轉子鐵芯31皆為積層鐵芯。例如,如圖2所示,定子鐵芯21係藉由在積層方向上積層複數片電磁鋼板40而形成。
另外,定子鐵芯21及轉子鐵芯31各自的積層厚度(沿中心軸線O之總長)例如設為50.0mm。定子鐵芯21之外徑例如設為250.0mm。定子鐵芯21之內徑例如設為165.0mm。轉子鐵芯31之外徑例如設為163.0mm。轉子鐵芯31之內徑例如設為30.0mm。惟,該等數值為一例,定子鐵芯21之積層厚度、外徑及內徑、以及轉子鐵芯31之積層厚度、外徑及內徑不僅限於該等數值。在此,定子鐵芯21之內徑係以定子鐵芯21中之齒部23的前端部為基準。亦即,定子鐵芯21之內徑為與所有齒部23之前端部內接之假想圓的直徑。
形成定子鐵芯21及轉子鐵芯31之各電磁鋼板40例如係藉由將如圖4至圖6所示之胚料1沖裁加工等而形成。胚料1為電磁鋼板40之母材的電磁鋼板。胚料1可舉例如帶狀鋼板或切割板等。
雖然尚在說明積層鐵芯的途中,但以下是針對該胚料1進行說明。又,在本說明書中,有時會將電磁鋼板40之母材的帶狀鋼板稱為胚料1。並且有時會將沖裁加工胚料1而做成用於積層鐵芯之形狀後的鋼板稱為電磁鋼板40。
(胚料1)
胚料1例如係以被捲成圖7所示之卷料1A的狀態來處理。在本實施形態中,胚料1係採用無方向性電磁鋼板。無方向性電磁鋼板可採用JIS C 2552:2014之無方向性電磁鋼板。然而,胚料1亦可取代無方向性電磁鋼板而採用方向性電磁鋼板。此時之方向性電磁鋼板可採用JIS C 2553:2019之方向性電磁鋼板。另外,還可採用JIS C 2558:2015之無方向性薄電磁鋼帶或方向性薄電磁鋼帶。
關於胚料1之平均板厚t0的上下限值,也考慮到胚料1作為電磁鋼板40來使用的情況,例如設定成如以下。
隨著胚料1變薄,胚料1的製造成本增加。因此,若考慮到製造成本,胚料1之平均板厚t0的下限值為0.10mm,且宜為0.15mm,較佳為0.18mm。
另一方面,若胚料1過厚,雖然製造成本變得良好,但在胚料1作為電磁鋼板40來使用的情況下,渦電流損耗會增加而鐵芯鐵損劣化。因此,若考慮鐵芯鐵損與製造成本,則胚料1之平均板厚t0的上限值為0.65mm,且宜為0.35mm,較佳為0.30mm。
作為滿足胚料1之平均板厚t0的上述範圍者,可例示0.20mm。
又,胚料1之平均板厚t0不僅包含後述母材鋼板2的厚度,還包含絕緣被膜3的厚度。另外,胚料1之平均板厚t0的測定方法譬如係利用以下測定方法。例如,在胚料1被捲成卷料1A之形狀的情況下,將胚料1的至少一部分解開成平板形狀。在已解開為平板形狀之胚料1中,選定胚料1之長邊方向的預定位置(例如,從胚料1之長邊方向端緣離開胚料1之總長10%份量之長度的位置)。在該選定位置上,將胚料1沿著其寬度方向區分為5個區域。在成為該等5個區域之境界的4處測定胚料1之板厚。並且可以4處板厚之平均值作為胚料1之平均板厚t0。
關於該胚料1之平均板厚t0,其上下限值當然亦可採用來作為電磁鋼板40之平均板厚t0的上下限值。又,電磁鋼板40之平均板厚t0的測定方法譬如係利用以下測定方法。例如,在圓周方向上空出同等間隔,在4處(亦即,以中心軸線O為中心每隔90度)測定積層鐵芯之積層厚度。
將所測出之4處的積層厚度分別除以被積層之電磁鋼板40的片數,算出每1片的板厚。並且可以4處板厚之平均值作為電磁鋼板40之平均板厚t0。
如圖5及圖6所示,胚料1具備母材鋼板2與絕緣被膜3。
胚料1係帶狀母材鋼板2的兩面經絕緣被膜3被覆而成。在本實施形態中,胚料1大部分係由母材鋼板2形成,且於母材鋼板2表面積層有較母材鋼板2更薄之絕緣被膜3。
如以下所示,母材鋼板2的化學組成以質量%計含有2.5%~4.5%的Si。又,藉由將化學組成設為該範圍,可將胚料1(電磁鋼板40)之降伏強度設定為例如380MPa以上且在540MPa以下。
Si:2.5%~4.5%
Al:0.001%~3.0%
Mn:0.05%~5.0%
剩餘部分:Fe及不純物
使用胚料1來作為電磁鋼板40時,絕緣被膜3係在積層方向上相鄰之電磁鋼板40間發揮絕緣性能。又,在本實施形態中,絕緣被膜3具備接著能力,可將在積層方向上相鄰之電磁鋼板40接著。絕緣被膜3可為單層結構,亦可為多層結構。更具體而言,例如絕緣被膜3可為兼具絕緣性能與接著能力的單層結構,亦可為包含絕緣性能優異之基底絕緣被膜與接著性能優異之表層絕緣被膜之多層結構。又,本實施形態中之「絕緣被膜3之接著能力」意指以下能力:在由夾著絕緣被膜3來積層之複數個電磁鋼板40所構成的積層體中,可在預定溫度條件下展現預定值以上之接著強度的能力。
在本實施形態中,絕緣被膜3係遍及母材鋼板2兩面的整面無間隙地覆蓋該兩面。然而,在可確保前述絕緣性能或接著能力之範圍中,絕緣被膜3之一部分的層亦可非無間隙地覆蓋母材鋼板2的兩面。換言之,絕緣被膜3之一部分的層亦可間斷性地設置於母材鋼板2的表面。惟,為了確保絕緣性能,母材鋼板2兩面必須被絕緣被膜3覆蓋,使整面皆不露出。具體而言,絕緣被膜3不具有絕緣性能優異之基底絕緣被膜而為兼具絕緣性能與接著能力之單層結構時,絕緣被膜3必須遍及母材鋼板2整面無間隙地形成。相對於此,當絕緣被膜3為包含絕緣性能優異之基底絕緣被膜與接著能力優異之表層絕緣被膜之多層結構時,除了遍及母材鋼板2的整面無間隙地形成基底絕緣被膜與表層絕緣被膜兩者之外,就算是遍及母材鋼板整面無間隙地形成基底絕緣被膜並且間斷性地設置表層絕緣被膜,也可兼顧絕緣性能與接著能力。
構成基底絕緣被膜之塗覆組成物並無特別限定,例如可使用含鉻酸處理劑、含磷酸鹽處理劑等一般處理劑。
具備接著能力之絕緣被膜3係塗佈含有環氧樹脂、環氧樹脂硬化劑及彈性體改質酚樹脂之電磁鋼板用塗覆組成物而形成。
由電磁鋼板用塗覆組成物形成之絕緣被膜在製造積層鐵芯時,於加熱壓接前係呈未硬化狀態或半硬化狀態(B階段),並且會透過加熱壓接時的加熱使硬化反應推進而展現出接著能力。電磁鋼板用塗覆組成物可用於形成單層結構之絕緣被膜,亦可用於形成設置在基底絕緣被膜上之表層絕緣被膜。
環氧樹脂可使用一般的環氧樹脂,具體而言若為一分子中具有2個以上環氧基之環氧樹脂,即可無特別限制地使用。所述環氧樹脂可舉例如雙酚A型環氧樹脂、雙酚F型環氧樹脂、苯酚酚醛清漆型環氧樹脂、甲酚酚醛清漆型環氧樹脂、三苯甲烷型環氧樹脂、脂環式環氧樹脂、環氧丙基酯型環氧樹脂、環氧丙基胺型環氧樹脂、海因(hydantoin)型環氧樹脂、三聚異氰酸酯型環氧樹脂、丙烯酸改質環氧樹脂(環氧丙烯酸酯)、含磷環氧樹脂、及該等之鹵化物(溴化環氧樹脂等)或加氫物等。環氧樹脂可單獨使用1種,亦可將2種以上併用。
環氧樹脂含量相對於電磁鋼板用塗覆組成物之總質量,譬如宜為30~90質量%,較佳為40~80質量%,50~70質量%更佳。環氧樹脂含量若在上述下限值以上,可更提高電磁鋼板40的接著強度。環氧樹脂含量若在上述上限值以下,可更抑制電磁鋼板40的應力應變。
環氧樹脂硬化劑係用以使環氧樹脂硬化者,可使用藉由加熱至預定溫度會開始硬化反應之類型的潛伏性硬化劑。環氧樹脂硬化劑可舉例如芳香族多胺、酸酐、酚系硬化劑、二氰二胺、三氟化硼-胺錯合物、有機酸醯肼等。
芳香族多胺可舉例如間苯二胺、二胺基二苯甲烷、二胺基二苯乙烷、二胺基二苯基碸等。
酸酐可舉例如酞酸酐、六氫酞酸酐、四氫酞酸酐、焦蜜石酸酐、1,2,4,5-苯四甲酸酐等。
酚系硬化劑可舉例如苯酚酚醛清漆樹脂、甲酚酚醛清漆樹脂、雙酚酚醛清漆樹脂、三𠯤改質苯酚酚醛清漆樹脂、可溶酚醛酚樹脂等。
從容易兼顧磁特性與耐熱性的觀點來看,環氧樹脂硬化劑宜為芳香族多胺、酚系硬化劑及二氰二胺,且較佳為酚系硬化劑,更佳為可溶酚醛酚樹脂、苯酚酚醛清漆樹脂。環氧樹脂硬化劑可單獨使用1種,亦可將2種以上併用。
在電磁鋼板用塗覆組成物中,環氧樹脂硬化劑含量之下限值宜相對於環氧樹脂100質量份為1質量份以上,較佳為3質量份以上。環氧樹脂硬化劑含量之上限值宜為50質量份以下,較佳為35質量份以下。
彈性體改質酚樹脂係將具有軟鏈段與硬鏈段之熱塑性彈性體接枝化後之酚樹脂。例如,可藉由在使酚類與醛類聚縮合時摻混彈性體,來獲得彈性體改質酚樹脂。又,藉由使彈性體對酚樹脂反應,也可獲得彈性體改質酚樹脂。
彈性體改質酚樹脂中之酚樹脂可為苯酚酚醛清漆樹脂,亦可為可溶酚醛酚樹脂。
酚類並無特別限定,可舉例如酚、鄰甲酚、腰果酚(cardanol)、烷基酚(異丙苯酚、對異丁苯酚等)、雙酚(雙酚A、雙酚F等)、多酚(間苯二酚等)。酚類可單獨使用1種,亦可併用2種以上。
醛類並無特別限定,可舉例如甲醛、聚甲醛、乙醛、苯甲醛等。醛類可單獨使用1種,亦可將2種以上併用。
熱塑性彈性體可舉例如丙烯酸橡膠、乙烯-丙烯橡膠、苯乙烯-丁二烯橡膠、丙烯腈-丁二烯橡膠、異戊二烯橡膠、聚矽氧橡膠等。熱塑性彈性體可單獨使用1種,亦可將2種以上併用。
彈性體改質酚樹脂之彈性體部的重量平均分子量(Mw)下限為2000以上且200000以下。彈性體部之Mw若在前述下限值以上,便容易抑制積層鐵芯的鐵損劣化。彈性體部之Mw若在前述上限值以下,可抑制塗佈於鋼板之電磁鋼板用塗覆組成物的增黏。
彈性體部之Mw下限宜為3000以上,較佳為4000以上。彈性體部之Mw上限宜為180000以下,較佳為160000以下。
又,彈性體部之Mw係利用水解反應將彈性體與酚樹脂分解,並藉由HPLC(液相層析法)進行分離後,以GPC(凝膠滲透層析法)作為聚苯乙烯換算值來測定。
彈性體改質酚樹脂中之彈性體部之含量下限宜為5質量%以上,較佳為10質量%以上。彈性體部之含量若在前述下限值以上,鐵芯鐵損良好。
彈性體部之含量上限宜為40質量%以下,較佳為35質量%以下。彈性體部之含量若在前述上限值以下,便可使其快速硬化。
在電磁鋼板用塗覆組成物中,彈性體改質酚樹脂之含量相對於環氧樹脂100質量份為10質量份以上且100質量份以下。彈性體改質酚樹脂之含量若在前述下限值以上,可獲得磁特性優異之積層鐵芯。彈性體改質酚樹脂之含量若在前述上限值以下,則可獲得耐熱性優異之積層鐵芯。
彈性體改質酚樹脂之含量下限宜為10質量份以上,較佳為20質量份以上。彈性體改質酚樹脂之含量上限宜為80質量份以下,較佳為70質量份以下。
電磁鋼板用塗覆組成物亦可含有環氧樹脂、環氧樹脂硬化劑及彈性體改質酚樹脂以外之其他成分。作為其他成分,可舉例如丙烯酸樹脂、硬化促進劑(硬化觸媒)、乳化劑、消泡劑等。又,從確保接著強度的觀點來看,於電磁鋼板用塗覆組成物中不含氧化矽、氧化鋁、玻璃等無機充填材。其他成分可僅使用1種,亦可將2種以上併用。
丙烯酸樹脂並無特別限定。作為用於丙烯酸樹脂之單體,可例示譬如丙烯酸、甲基丙烯酸等不飽和羧酸、(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸異丁酯、(甲基)丙烯酸環己酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸2-羥乙酯、(甲基)丙烯酸羥丙酯等(甲基)丙烯酸酯。又,所謂(甲基)丙烯酸酯意指丙烯酸酯或甲基丙烯酸酯。丙烯酸樹脂可單獨使用1種,亦可將2種以上併用。
丙烯酸樹脂亦可具有源自丙烯酸單體以外之其他單體的構成單元。其他單體可舉例如乙烯、丙烯、苯乙烯等。其他單體可單獨使用1種,亦可將2種以上併用。
丙烯酸樹脂之玻璃轉移點(Tg點)並無特別限定,下限宜為-40℃,較佳為-20℃。丙烯酸樹脂之Tg點上限宜為80℃,較佳為50℃。
電磁鋼板用塗覆組成物含有丙烯酸樹脂時,丙烯酸樹脂之含量並無特別限制,例如可設為相對於環氧樹脂與丙烯酸樹脂之合計量為5質量%以上且60質量%以下。作為丙烯酸改質環氧樹脂或丙烯酸單體來含有時之含量亦同。
使用丙烯酸樹脂時,亦可作為使丙烯酸樹脂接枝於環氧樹脂之丙烯酸改質環氧樹脂來使用。在電磁鋼板用塗覆組成物中,亦可作為形成丙烯酸樹脂之單體來包含。
一般而言,耐熱性優異之環氧樹脂接著劑若擔保在高溫下之接著強度,在常溫附近楊氏模數較大,會對鋼板賦予應力使磁特性(鐵芯鐵損)劣化。另一方面,若設為在常溫附近具有適度強度的樹脂組成,耐熱性會降低。
在本實施形態中,藉由使用將具有軟鏈段與硬鏈段且彈性模數大之熱塑性彈性體接枝化後的彈性體改質酚樹脂,可抑制在常溫附近對鋼板賦予應力,因而可抑制磁特性(鐵芯鐵損)劣化。
另外,由於彈性體鍵結於酚樹脂,即使曝露在高溫下也不會流動,故亦可確保在高溫環境下之接著強度。如此一來,藉由使用特定量之彈性體改質酚樹脂,可兼顧磁特性及耐熱性。又,不將熱塑性彈性體接枝化而僅單純使熱塑性彈性體含於組成物中時,難以享有本發明效果。亦即,藉由使用將熱塑性彈性體接枝化後之彈性體改質酚樹脂,可獲得更優異之磁特性。在使用未接枝化之熱塑性彈性體的情況下,高溫下之接著強度恐會降低、或是在對鋼板施加壓力時僅熱塑性彈性體成分流動而積層狀態恐會歪斜。
電磁鋼板用塗覆組成物之硬化收縮率宜為15%以下,較佳為12%以下,10%以下更佳,8%以下尤佳。硬化收縮率若在前述上限值以下,容易減低對鋼板賦予應力的情況,而容易獲得磁特性優異之積層鐵芯。
又,硬化收縮率係藉由依據JIS K6941之方法來測定。
絕緣被膜3例如可藉由將電磁鋼板用塗覆組成物塗佈於母材鋼板表面後,加以乾燥且進行燒附來形成。
燒附時之到達溫度的下限值宜為120℃以上,較佳為140℃以上。燒附時之到達溫度的上限值宜為200℃以下,較佳為180℃以下。到達溫度若在上述下限值以上,電磁鋼板用塗覆組成物便會與電磁鋼板充分接著,而可抑制剝離。到達溫度若在上述上限值以下,可抑制環氧樹脂變得過硬,且可維持電磁鋼板用塗覆組成物之接著能力。
燒附時間之下限值宜為5秒以上,較佳為10秒以上。燒附時間之上限值宜為40秒以下,較佳為30秒以下。燒附時間若在上述下限值以上,電磁鋼板用塗覆組成物便可與電磁鋼板充分接著,而可抑制剝離。燒附時間若在上述上限值以下,可抑制環氧樹脂變得過硬,且可維持電磁鋼板用塗覆組成物之接著能力。
關於絕緣被膜3之平均厚度t1的上下限值,也考慮到胚料1作為電磁鋼板40來使用的情況,例如可設定成如以下。
胚料1作為電磁鋼板40來使用時,絕緣被膜3之平均厚度t1(電磁鋼板40(胚料1)每面的厚度)係調整成可確保在互相積層之電磁鋼板40間的絕緣性能及接著能力。
在單層結構之絕緣被膜3的情況下,絕緣被膜3整體之平均厚度t1(電磁鋼板40(胚料1)每面的厚度)例如可設為1.5µm以上且8.0µm以下。
在多層結構之絕緣被膜3的情況下,基底絕緣被膜之平均厚度例如可設為0.3µm以上且2.5µm以下,且宜為0.5µm以上且1.5µm以下。表層絕緣被膜之平均厚度例如可設為1.5µm以上且8.0µm以下。
又,胚料1中之絕緣被膜3之平均厚度t1的測定方法可按與胚料1之平均板厚t0同樣想法,求算複數處之絕緣被膜3的厚度,作為該等厚度之平均來求算。
關於該胚料1中之絕緣被膜3之平均厚度t1,其上下限值當然亦可採用來作為電磁鋼板40中之絕緣被膜3之平均厚度t1的上下限值。
又,電磁鋼板40中之絕緣被膜3之平均厚度t1的測定方法譬如係利用以下測定方法。例如,選定形成積層鐵芯的複數片電磁鋼板之中位於積層方向最外側之電磁鋼板40(表面在積層方向露出之電磁鋼板40)。在所選定之電磁鋼板40的表面中,選定直徑方向的預定位置(例如,在電磁鋼板40之內周緣與外周緣的正中間(中央)的位置)。在所選定之位置上,在圓周方向上空出同等間隔,在4處(亦即,以中心軸線O為中心每隔90度)測定電磁鋼板40之絕緣被膜3的厚度。並且可以所測出之4處厚度之平均值作為絕緣被膜3之平均厚度t1。
又,如所述這般在位於積層方向最外側之電磁鋼板40中測定絕緣被膜3之平均厚度t1的理由在於:絕緣被膜3係被精心製作成絕緣被膜3之厚度在沿著電磁鋼板40之積層方向的積層位置上幾乎不變。
藉由將如以上所述之胚料1沖裁加工來製造電磁鋼板40,並且利用電磁鋼板40來製造積層鐵芯(定子鐵芯21或轉子鐵芯31)。
(積層鐵芯之積層方法)
以下,回到積層鐵芯之說明。
如圖3所示,形成定子鐵芯21之複數片電磁鋼板40係透過絕緣被膜3來積層。
在積層方向上相鄰之電磁鋼板40係藉由絕緣被膜3遍及整面來接著。換言之,在電磁鋼板40中朝向積層方向的面(以下稱為第1面)係遍及整面皆成為接著區域41a。然而,在積層方向上相鄰之電磁鋼板40亦可未遍及整面被接著。換言之,在電磁鋼板40之第1面中,亦可混合存在有接著區域41a與非接著區域(未圖示)。
在本實施形態中,用以形成轉子鐵芯31之複數片電磁鋼板係藉由圖1所示之歛合件42(定位銷)來互相固定。但,形成轉子鐵芯31之複數片電磁鋼板也可與定子鐵芯21同樣地具有藉由絕緣被膜3來固定之積層結構。
另外,定子鐵芯21或轉子鐵芯31等積層鐵芯亦可藉由所謂之捲繞層疊來形成。
(積層鐵芯之製造方法)
前述定子鐵芯21例如係使用圖7所示製造裝置100來製造。以下,在說明製造方法時,首先先說明積層鐵芯之製造裝置100(以下簡稱為製造裝置100)。
在製造裝置100中,係從卷料1A(鋼帶)將胚料1朝向箭頭F方向送出的同時,藉由配置於各站的模具進行複數次沖裁而逐漸形成電磁鋼板40的形狀。然後,將沖裁後之電磁鋼板40積層,並且一邊使其升溫一邊加壓。其結果,透過絕緣被膜3使在積層方向上相鄰之電磁鋼板40接著(亦即,使絕緣被膜3之中位於接著區域41a的部分發揮接著能力),而完成接著。
如圖7所示,製造裝置100具備有複數階之沖裁站110。沖裁站110可為二階,亦可為三階以上。各階之沖裁站110具備配置於胚料1之下方的母模111與配置於胚料1之上方的公模112。
製造裝置100在較最下游之沖裁站110更下游的位置,進一步具備積層站140。該積層站140具備有加熱裝置141、外周沖裁母模142、隔熱構件143、外周沖裁公模144及彈簧145。
加熱裝置141、外周沖裁母模142及隔熱構件143配置於胚料1之下方。另一方面,外周沖裁公模144及彈簧145配置於胚料1之上方。又,符號21表示定子鐵芯。
在具有以上說明之結構的製造裝置100中,首先從卷料1A將胚料1沿圖7之箭頭F方向依序送出。然後,藉由複數階之沖裁站110對於該胚料1依序施行沖裁加工。藉由該等沖裁加工,在胚料1獲得圖3所示之具有芯背部22與複數個齒部23之電磁鋼板40的形狀。惟,在此時間點尚未完全沖裁,因此沿著箭頭F方向往下一個步驟前進。
然後,最後胚料1會被送出到積層站140,被外周沖裁公模144沖裁並且精確地積層。在該積層時,電磁鋼板40係藉由彈簧145而受到固定的加壓力。藉由依序重複如以上說明之沖裁步驟與積層步驟,可堆疊預定片數之電磁鋼板40。且更進一步,以如上述方式堆疊電磁鋼板40而形成的積層鐵芯係藉由加熱裝置141被加熱至例如200℃的溫度。藉由該加熱,相鄰之電磁鋼板40之絕緣被膜3彼此會被接著(接著步驟)。
接著步驟之條件並無特別限定。譬如,接著步驟中之加熱溫度宜為120~250℃。接著步驟中之加熱時間會因積層鐵芯之大小或加熱方法而受到影響,但例如宜為30秒~120分鐘。又,使絕緣被膜3彼此接著時,亦可藉由加壓積層體來使其接著。加壓積層體時的壓力及加壓時間譬如宜為2~300MPa、30秒~120分鐘。
又,加熱裝置141亦可不配置於外周沖裁母模142。亦即,亦可在要接著經外周沖裁母模142積層之電磁鋼板40之前,將其取出至外周沖裁母模142外。在此情況下,於外周沖裁母模142亦可無隔熱構件143。此外,在此情況下,亦可將所堆疊之接著前的電磁鋼板40利用未圖示之夾具從積層方向的兩側夾住並保持後,將其運送或加熱。
藉由以上各步驟,定子鐵芯21便完成。
如以上所說明,在本發明中係利用經以特定比率將彈性體改質酚樹脂組合到環氧樹脂及環氧樹脂硬化劑中之電磁鋼板用塗覆組成物,於電磁鋼板表面形成絕緣被膜。藉此,可兼顧積層鐵芯之優異磁特性(鐵芯鐵損)與即便在驅動時之高溫狀態下仍可維持電磁鋼板彼此之接著強度的優異耐熱性。
又,本發明之技術範圍不限定於前述實施形態,在不脫離本發明主旨之範圍內可加入各種變更。
並且,定子鐵芯的形狀不限定於前述實施形態所示之形態。具體而言,定子鐵芯之外徑及內徑尺寸、積層厚度、槽數、齒部之圓周方向與直徑方向的尺寸比例、齒部與芯背部之直徑方向的尺寸比例等,可因應所欲之旋轉電機特性來任意設計。
雖然在前述實施形態之轉子中,2個1組的永久磁鐵32形成有1個磁極,但本發明不限於此。例如,亦可為1個永久磁鐵32形成有1個磁極,或可為3個以上永久磁鐵32形成有1個磁極。
在上述實施形態中,作為旋轉電機10係舉永久磁鐵磁場型電動機為一例進行了說明,但如以下所例示這般,旋轉電機10之構造並不僅限於此,也可進一步採用以下未例示之各種公知構造。
在上述實施形態中,作為旋轉電機10係舉永久磁鐵磁場型電動機為一例進行了說明,但本發明並不僅限於此。例如,旋轉電機10亦可為磁阻型電動機或電磁鐵磁場型電動機(磁場繞組型電動機)。
在上述實施形態中,作為交流電動機係舉同步電動機為一例進行了說明,但本發明不限於此。例如,旋轉電機10亦可為感應電動機。
在上述實施形態中,作為旋轉電機10係舉交流電動機為一例進行了說明,但本發明不限於此。例如,旋轉電機10亦可為直流電動機。
在上述實施形態中,作為旋轉電機10係舉電動機為一例進行了說明,但本發明不限於此。例如,旋轉電機10亦可為發電機。
另外,在不脫離本發明主旨之範圍內,可將前述實施形態之構成要素適當置換成周知之構成要素,又,亦可適當組合前述變形例。
實施例
以下,藉由實施例來具體說明本發明一態樣之效果,但實施例中之條件係為了確認本發明之可實施性及效果而採用的一條件例,本發明不受限於以下記載內容。只要能在不脫離本發明主旨下達成本發明之目的,則本發明可採用各種條件。
[原料]
以下列示實施例中使用之原料。
(環氧樹脂)
E1:雙酚A型環氧樹脂
E2:雙酚F型環氧樹脂
E3:甲酚酚醛清漆型環氧樹脂
(彈性體改質酚樹脂)
A1:丙烯酸橡膠改質酚樹脂(酚醛清漆型,酚樹脂部與彈性體部之質量比=70:30,彈性體部之Mw:35000)
A2:苯乙烯-丁二烯橡膠改質酚樹脂(酚醛清漆型,酚樹脂部與彈性體部之質量比=65:35,彈性體部之Mw:20000)
A3:乙烯-丙烯橡膠改質酚樹脂(酚醛清漆型,酚樹脂部與彈性體部之質量比=85:15,彈性體部之Mw:160000)
A4:聚矽氧橡膠改質酚樹脂(酚醛清漆型,酚樹脂部與彈性體部之質量比=90:10,彈性體部之Mw:3000)
(環氧樹脂硬化劑)
H1:可溶酚醛酚樹脂
H2:苯酚酚醛清漆樹脂
H3:二胺基二苯甲烷
H4:二氰二胺
H5:4-甲基六氫酞酸酐
(摻混劑)
M1:丙烯酸樹脂(甲基丙烯酸甲酯單元:苯乙烯單元:丙烯酸2-乙基己酯單元(莫耳比)=60:30:10,玻璃轉移溫度:40℃)
M2:丙烯酸樹脂(甲基丙烯酸甲酯單元:丙烯酸正丁酯單元(莫耳比)=70:30,玻璃轉移溫度:15℃)
[磁特性]
從各例之電磁鋼帶裁切出55mm×55mm尺寸之矩形電磁鋼板(單板),在鋼板溫度200℃、壓力10MPa及加壓時間1小時之條件下積層接著10片電磁鋼板而製作出積層鐵芯。針對所得之積層鐵芯,藉由依據JIS C2556(2015)之單板磁測定法,測定軋延方向與相對於軋延方向為直角方向之單板磁特性,且求出該等值的平均值來作為磁特性。又,磁特性(磁性)係作為鐵損評估了「W10/400(W/kg)」。「W10/400」為頻率400Hz且最大磁通密度1.0T時的鐵損。
[接著強度]
從各例之電磁鋼帶裁切出2片寬度30mm×長度60mm之長方形電磁鋼板(單板)。接著,於表面塗佈電磁鋼板用塗覆組成物,並將互相之寬度30mm×長度10mm的前端部分彼此重疊且加壓,藉此製作出測定用試樣。加壓條件設為鋼板溫度200℃、壓力10MPa、加壓時間1小時。
針對所得試樣,分別在將氣體環境溫度設為25℃或150℃的氣體環境下,將拉伸速度設為2mm/分鐘,測定拉伸至剝離為止的最大荷重(N),並將該最大荷重(N)除以接著面積後之數值定為接著強度(MPa)。
[硬化收縮率]
於各例之電磁鋼帶的表面塗佈電磁鋼板用塗覆組成物,並測定硬化收縮率。硬化收縮率係依據JIS K 6941藉由膜厚變化來測定。
[判定]
針對各例,按以下基準進行判定。又,鐵損越小意味著對電磁鋼板賦予之應力應變越被抑制。將測定結果及判定結果列示於表2。在表中,針對發明範圍外之值附加了底線。
[基準]
「佳」:25℃之接著強度為5.0MPa以上、150℃之接著強度為1.0MPa以上且磁特性小於12.0W/kg。
「不佳」:25℃之接著強度小於5.0MPa、150℃之接著強度小於1.0MPa或磁特性為12.0W/kg以上。
[實施例1]
作為母材鋼板,使用了板厚0.25mm且寬度100mm之無方向性電磁鋼板,該無方向性電磁鋼板以質量%計為Si:3.0%、Mn:0.2%及Al:0.5%,且剩餘部分由Fe及不純物所構成。
將表1所示各成分混合,調製出電磁鋼板用塗覆組成物。將所得電磁鋼板用塗覆組成物塗佈於母材鋼板表面後,在200℃下燒附5秒,藉此獲得具有平均厚度為3µm之絕緣被膜的電磁鋼帶。
[實施例2~10、比較例1~6]
除了將電磁鋼板用塗覆組成物之組成及燒附條件變更成如表1所示以外,以與實施例1相同方式進行而獲得電磁鋼帶。
各例之電磁鋼板用塗覆組成物之組成及燒附條件列示於表1。各例之磁特性(磁性)及接著強度的評估結果列示於表2。
如表2所示這般,經以特定比率將彈性體改質酚樹脂組合到環氧樹脂及環氧樹脂硬化劑中之實施例1~10,即使在150℃下仍確保有充分的接著強度,耐熱性優異,而且磁特性亦優異。
另一方面,彈性體改質酚樹脂含量在本發明範圍外之比較例1~4、不含彈性體改質酚樹脂之比較例5及不含環氧樹脂硬化劑之比較例6,其等無法兼顧耐熱性與磁特性。
產業上之可利用性
根據本發明,可兼顧積層鐵芯之耐熱性與磁特性。據此,產業上之可利用性甚大。
1:胚料
1A:卷料
2:母材鋼板
3:絕緣被膜
10:旋轉電機
20:定子
21:定子鐵芯(定子用接著積層鐵芯)
22:芯背部
23:齒部
30:轉子
31:轉子鐵芯
32:永久磁鐵
33:貫通孔
40:電磁鋼板
41a:接著區域
42:歛合件
50:罩殼
60:旋轉軸
100:製造裝置
110:沖裁站
111:母模
112:公模
140:積層站
141:加熱裝置
142:外周沖裁母模
143:隔熱構件
144:外周沖裁公模
145:彈簧
A-A,B-B:線
C:部位
F:箭頭
O:中心軸線
t0:胚料之平均板厚
t1:絕緣被膜之平均厚度
圖1為旋轉電機的截面圖,該旋轉電機具備本發明第1實施形態之積層鐵芯。
圖2為圖1所示積層鐵芯的側視圖。
圖3為圖2的A-A截面圖。
圖4為用以形成圖1所示積層鐵芯之胚料的俯視圖。
圖5為圖4的B-B截面圖。
圖6為圖5之C部位的放大圖。
圖7為製造裝置的側視圖,該製造裝置係用來製造圖1所示積層鐵芯。
10:旋轉電機
20:定子
21:定子鐵芯(定子用接著積層鐵芯)
22:芯背部
23:齒部
30:轉子
31:轉子鐵芯
32:永久磁鐵
33:貫通孔
40:電磁鋼板
42:歛合件
50:罩殼
60:旋轉軸
O:中心軸線
Claims (6)
- 一種電磁鋼板用塗覆組成物,含有:環氧樹脂、環氧樹脂硬化劑及彈性體改質酚樹脂;並且, 前述彈性體改質酚樹脂之含量相對於前述環氧樹脂100質量份為10質量份以上且100質量份以下。
- 如請求項1之電磁鋼板用塗覆組成物,其中彈性體改質酚樹脂之彈性體部的重量平均分子量為2000以上且200000以下。
- 如請求項1或2之電磁鋼板用塗覆組成物,其硬化收縮率為15%以下。
- 一種電磁鋼板,於表面具有包含如請求項1至3中任一項之電磁鋼板用塗覆組成物的絕緣被膜。
- 一種積層鐵芯,係積層有複數片如請求項4之電磁鋼板且其等互相接著者。
- 一種旋轉電機,具備如請求項5之積層鐵芯。
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