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永磁無刷直流電機維修具有哪些重要特點

文章出處:maituwangluo.com  |  發布時間:2018/3/10 8:51:18  |  瀏覽次數:753
針(zhen)對(dui)(dui)不(bu)同的(de)(de)原因,國內外許(xu)多學者作(zuo)(zuo)了(le)大量的(de)(de)研究工作(zuo)(zuo)。對(dui)(dui)于齒槽轉(zhuan)矩(ju)產生和(he)削(xue)弱方(fang)法,采用定子(zi)斜槽的(de)(de)方(fang)法可取得較好效果。對(dui)(dui)于換(huan)(huan)相(xiang)轉(zhuan)矩(ju)波動,文獻[9]從 3 個(ge)不(bu)同的(de)(de)狀態作(zuo)(zuo)了(le)詳(xiang)細的(de)(de)分析,指出換(huan)(huan)相(xiang)轉(zhuan)矩(ju)波動與反電(dian)(dian)勢和(he)電(dian)(dian)源(yuan)電(dian)(dian)壓以(yi)及轉(zhuan)速之間的(de)(de)關系(xi);針(zhen)對(dui)(dui)換(huan)(huan)相(xiang)時總電(dian)(dian)流(liu)下降的(de)(de)現狀,采用電(dian)(dian)流(liu)反饋、重疊換(huan)(huan)相(xiang)以(yi)及人工智能算法等方(fang)法維持換(huan)(huan)相(xiang)時總電(dian)(dian)流(liu)不(bu)變以(yi)抑制換(huan)(huan)相(xiang)轉(zhuan)矩(ju)波動[10-12]
 
文(wen)(wen)獻(xian)[13]對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)的相(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)(dian)壓和相(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)(dian)流進(jin)行 Fourier 級數分解(jie),針(zhen)對(dui)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)矩(ju)(ju)(ju)(ju)諧(xie)波(bo)(bo)(bo)(bo)進(jin)行補(bu)償。文(wen)(wen)獻(xian)[14]對(dui)電(dian)(dian)(dian)(dian)(dian)(dian)樞反(fan)應(ying)(ying)(ying)引起的轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)矩(ju)(ju)(ju)(ju)波(bo)(bo)(bo)(bo)動(dong)(dong)做了(le)分析,并在(zai)設計磁(ci)路(lu)和換相(xiang)(xiang)控(kong)制(zhi)(zhi)(zhi)兩(liang)個方面提出了(le)削弱電(dian)(dian)(dian)(dian)(dian)(dian)樞反(fan)應(ying)(ying)(ying)對(dui)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)矩(ju)(ju)(ju)(ju)波(bo)(bo)(bo)(bo)動(dong)(dong)的影響。文(wen)(wen)獻(xian)[15]提出利用轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)矩(ju)(ju)(ju)(ju)觀測器間接(jie)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)矩(ju)(ju)(ju)(ju)反(fan)饋方法,即(ji)利用反(fan)電(dian)(dian)(dian)(dian)(dian)(dian)勢、相(xiang)(xiang)電(dian)(dian)(dian)(dian)(dian)(dian)流、電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)速(su)作為(wei)輸入信(xin)號,波(bo)(bo)(bo)(bo)動(dong)(dong)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)矩(ju)(ju)(ju)(ju)作為(wei)輸出信(xin)號構成波(bo)(bo)(bo)(bo)動(dong)(dong)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)矩(ju)(ju)(ju)(ju)觀測器,實時在(zai)線估計轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)矩(ju)(ju)(ju)(ju)大小的變化(hua),針(zhen)對(dui)不同的情(qing)況作相(xiang)(xiang)應(ying)(ying)(ying)的補(bu)償。文(wen)(wen)獻(xian)[16]將直(zhi)接(jie)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)矩(ju)(ju)(ju)(ju)控(kong)制(zhi)(zhi)(zhi)的概念(nian)引入無刷直(zhi)流電(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)控(kong)制(zhi)(zhi)(zhi)系統中,其對(dui)轉(zhuan)(zhuan)(zhuan)(zhuan)(zhuan)矩(ju)(ju)(ju)(ju)波(bo)(bo)(bo)(bo)動(dong)(dong)的抑制(zhi)(zhi)(zhi)取得了(le)較好效果。
 
總(zong)之,引起無刷(shua)直(zhi)流電(dian)機(ji)轉矩波動的(de)(de)(de)(de)因素很(hen)復雜,針對(dui)不(bu)(bu)同(tong)的(de)(de)(de)(de)情況可采用相應(ying)的(de)(de)(de)(de)控制方(fang)法(fa),各種(zhong)方(fang)法(fa)都有自己(ji)的(de)(de)(de)(de)優缺(que)點(dian)和適應(ying)的(de)(de)(de)(de)場合(he),在不(bu)(bu)同(tong)環境(jing)下針對(dui)不(bu)(bu)同(tong)的(de)(de)(de)(de)要求,可以采用不(bu)(bu)同(tong)的(de)(de)(de)(de)方(fang)法(fa)。隨著微電(dian)子技術的(de)(de)(de)(de)發展和永磁材料(liao)磁性(xing)能的(de)(de)(de)(de)不(bu)(bu)斷提高,永磁無刷(shua)直(zhi)流電(dian)機(ji)近年(nian)來(lai)受到普遍重視(shi),并且取得了很(hen)大的(de)(de)(de)(de)發展。
永磁無刷(shua)直流電機具有調速(su)方便、結(jie)構簡單、維(wei)護簡便、電磁污染(ran)小、功率(lv)密度大等優點,在伺服系統及小功率(lv)拖動(dong)系統中得到了廣泛的應用(yong)。
然而,由于(yu)電(dian)機本身結構以及饋電(dian)系統等(deng)方(fang)面的(de)原因,無刷直(zhi)流電(dian)機具有較大的(de)轉矩波動(dong)(dong),這限制了其在(zai)精密傳動(dong)(dong)和(he)大功(gong)率(lv)驅動(dong)(dong)等(deng)系統中的(de)應用;另外,轉矩波動(dong)(dong)導(dao)致(zhi)電(dian)機振(zhen)動(dong)(dong)加劇,噪聲增加,也(ye)影(ying)響了電(dian)機壽命。
 
制轉(zhuan)(zhuan)矩(ju)波動(dong)(dong)(dong)(dong)一直(zhi)是永磁無刷直(zhi)流(liu)(liu)電機控制的(de)(de)(de)重要(yao)內(nei)容。按轉(zhuan)(zhuan)矩(ju)波動(dong)(dong)(dong)(dong)產生的(de)(de)(de)原因(yin),可分為:電磁因(yin)素引起(qi)(qi)的(de)(de)(de)轉(zhuan)(zhuan)矩(ju)波動(dong)(dong)(dong)(dong)、電流(liu)(liu)換向引起(qi)(qi)的(de)(de)(de)轉(zhuan)(zhuan)矩(ju)波動(dong)(dong)(dong)(dong)、齒槽(cao)引起(qi)(qi)的(de)(de)(de)轉(zhuan)(zhuan)矩(ju)波動(dong)(dong)(dong)(dong)、電樞反應影響和機械工(gong)藝引起(qi)(qi)的(de)(de)(de)轉(zhuan)(zhuan)矩(ju)波動(dong)(dong)(dong)(dong)等,其中前(qian) 3 者對轉(zhuan)(zhuan)矩(ju)波動(dong)(dong)(dong)(dong)影響較大。
 
針(zhen)對(dui)不(bu)同(tong)的(de)(de)原(yuan)因,國內外許多(duo)學者作了(le)大量的(de)(de)研究(jiu)工作。對(dui)于(yu)齒槽(cao)轉矩(ju)產生和削弱方法(fa),采用定子斜槽(cao)的(de)(de)方法(fa)可(ke)取得較好效果(guo)。對(dui)于(yu)換(huan)相(xiang)(xiang)轉矩(ju)波動(dong),文獻[9]從 3 個不(bu)同(tong)的(de)(de)狀態作了(le)詳細(xi)的(de)(de)分析,指出(chu)換(huan)相(xiang)(xiang)轉矩(ju)波動(dong)與(yu)反(fan)電(dian)(dian)勢和電(dian)(dian)源電(dian)(dian)壓以(yi)及(ji)轉速之間的(de)(de)關系(xi);針(zhen)對(dui)換(huan)相(xiang)(xiang)時總電(dian)(dian)流下(xia)降的(de)(de)現狀,采用電(dian)(dian)流反(fan)饋、重(zhong)疊換(huan)相(xiang)(xiang)以(yi)及(ji)人工智能算法(fa)等方法(fa)維持換(huan)相(xiang)(xiang)時總電(dian)(dian)流不(bu)變以(yi)抑制(zhi)換(huan)相(xiang)(xiang)轉矩(ju)波動(dong)

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