永磁(ci)直流力(li)矩(ju)電(dian)機(ji)的(de)(de)氣隙(xi)在減小力(li)矩(ju)的(de)(de)波動(dong)時(shi)，一般內阻越大(da)，恒流特性越好(hao)。增(zeng)大(da)氣隙(xi)可(ke)以減小永磁(ci)直流力(li)矩(ju)電(dian)機(ji)的(de)(de)波動(dong)。直流力(li)矩(ju)電(dian)機(ji)的(de)(de)電(dian)樞(shu)電(dian)感，在單獨測量(liang)電(dian)樞(shu)值時(shi)，會(hui)遇到(dao)哪些問題？

　　1、增(zeng)大(da)永(yong)磁(ci)(ci)(ci)(ci)(ci)直流力(li)矩(ju)(ju)電(dian)(dian)(dian)機(ji)的(de)(de)(de)(de)氣(qi)(qi)隙(xi)可(ke)(ke)以(yi)(yi)減小(xiao)力(li)矩(ju)(ju)波(bo)動(dong)從電(dian)(dian)(dian)機(ji)理(li)論(lun)可(ke)(ke)知(zhi)，在一(yi)(yi)(yi)定電(dian)(dian)(dian)樞電(dian)(dian)(dian)流T=CmI的(de)(de)(de)(de)情況(kuang)下，直流力(li)矩(ju)(ju)電(dian)(dian)(dian)機(ji)的(de)(de)(de)(de)電(dian)(dian)(dian)磁(ci)(ci)(ci)(ci)(ci)力(li)矩(ju)(ju)T與氣(qi)(qi)隙(xi)磁(ci)(ci)(ci)(ci)(ci)通(tong)成正比，波(bo)動(dong)，必然導致直流力(li)矩(ju)(ju)電(dian)(dian)(dian)機(ji)轉矩(ju)(ju)波(bo)動(dong)。增(zeng)大(da)永(yong)磁(ci)(ci)(ci)(ci)(ci)直流力(li)矩(ju)(ju)電(dian)(dian)(dian)機(ji)氣(qi)(qi)隙(xi)的(de)(de)(de)(de)目的(de)(de)(de)(de)是通(tong)過穩(wen)定氣(qi)(qi)隙(xi)磁(ci)(ci)(ci)(ci)(ci)通(tong)，即恒磁(ci)(ci)(ci)(ci)(ci)通(tong)來減小(xiao)力(li)矩(ju)(ju)波(bo)動(dong)。我們知(zhi)道電(dian)(dian)(dian)路中的(de)(de)(de)(de)恒流是通(tong)過增(zeng)加內阻(zu)來實現的(de)(de)(de)(de)。內阻(zu)越大(da)，恒流特性越好。磁(ci)(ci)(ci)(ci)(ci)路與電(dian)(dian)(dian)路類(lei)似，可(ke)(ke)以(yi)(yi)通(tong)過增(zeng)加磁(ci)(ci)(ci)(ci)(ci)電(dian)(dian)(dian)阻(zu)來維(wei)持。所以(yi)(yi)，增(zeng)大(da)永(yong)磁(ci)(ci)(ci)(ci)(ci)直流力(li)矩(ju)(ju)電(dian)(dian)(dian)機(ji)的(de)(de)(de)(de)氣(qi)(qi)隙(xi)可(ke)(ke)以(yi)(yi)使其氣(qi)(qi)隙(xi)磁(ci)(ci)(ci)(ci)(ci)通(tong)因(yin)磁(ci)(ci)(ci)(ci)(ci)阻(zu)增(zeng)大(da)而更(geng)加穩(wen)定。這樣(yang)可(ke)(ke)以(yi)(yi)減小(xiao)磁(ci)(ci)(ci)(ci)(ci)阻(zu)的(de)(de)(de)(de)變化對(dui)氣(qi)(qi)隙(xi)磁(ci)(ci)(ci)(ci)(ci)通(tong)的(de)(de)(de)(de)影響(xiang)。所以(yi)(yi)，增(zeng)大(da)氣(qi)(qi)隙(xi)可(ke)(ke)以(yi)(yi)減小(xiao)永(yong)磁(ci)(ci)(ci)(ci)(ci)直流力(li)矩(ju)(ju)電(dian)(dian)(dian)機(ji)的(de)(de)(de)(de)力(li)矩(ju)(ju)波(bo)動(dong)。當然，氣(qi)(qi)隙(xi)不(bu)能太大(da)。雖然其恒磁(ci)(ci)(ci)(ci)(ci)效應較好，但會影響(xiang)其他性能指標(biao)。我們不(bu)應該忽(hu)略一(yi)(yi)(yi)件事而失(shi)去另一(yi)(yi)(yi)件事。

　　2、測量永(yong)磁(ci)(ci)直流力矩(ju)電(dian)機電(dian)樞(shu)電(dian)感(gan)，為(wei)什么(me)單獨測量電(dian)樞(shu)值大，裝入永(yong)磁(ci)(ci)定(ding)子(zi)后測量電(dian)樞(shu)值小(xiao)？

　　一般感(gan)(gan)(gan)(gan)應電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)的(de)(de)(de)定子(zi)(zi)(zi)和(he)(he)(he)(he)轉(zhuan)子(zi)(zi)(zi)分別測(ce)量(liang)繞(rao)組(zu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)時(shi)(shi)(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)值很(hen)(hen)小(xiao)(xiao)(xiao)。當定子(zi)(zi)(zi)和(he)(he)(he)(he)轉(zhuan)子(zi)(zi)(zi)裝(zhuang)配(pei)到(dao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)中(zhong)并進(jin)行(xing)測(ce)量(liang)時(shi)(shi)(shi)，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)值變得非常大。這(zhe)是因為這(zhe)類電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)定子(zi)(zi)(zi)和(he)(he)(he)(he)轉(zhuan)子(zi)(zi)(zi)分離時(shi)(shi)(shi)，磁(ci)(ci)(ci)路斷開，僅由(you)漏(lou)磁(ci)(ci)(ci)產生的(de)(de)(de)自(zi)感(gan)(gan)(gan)(gan)和(he)(he)(he)(he)互感(gan)(gan)(gan)(gan)很(hen)(hen)小(xiao)(xiao)(xiao)。當定子(zi)(zi)(zi)和(he)(he)(he)(he)轉(zhuan)子(zi)(zi)(zi)組(zu)裝(zhuang)在一起(qi)，連接磁(ci)(ci)(ci)路時(shi)(shi)(shi)，附加(jia)的(de)(de)(de)磁(ci)(ci)(ci)場增(zeng)(zeng)加(jia)很(hen)(hen)多，自(zi)感(gan)(gan)(gan)(gan)和(he)(he)(he)(he)互感(gan)(gan)(gan)(gan)增(zeng)(zeng)強，所以(yi)測(ce)量(liang)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)值很(hen)(hen)大。永(yong)磁(ci)(ci)(ci)直流(liu)(liu)力矩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)和(he)(he)(he)(he)其他永(yong)磁(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)和(he)(he)(he)(he)感(gan)(gan)(gan)(gan)應電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)動機(ji)(ji)是不同的(de)(de)(de)，盡管(guan)它(ta)將定子(zi)(zi)(zi)和(he)(he)(he)(he)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)樞(shu)組(zu)裝(zhuang)在一起(qi)形(xing)成磁(ci)(ci)(ci)路，磁(ci)(ci)(ci)鋼的(de)(de)(de)磁(ci)(ci)(ci)路與軟(ruan)磁(ci)(ci)(ci)性材料相比，磁(ci)(ci)(ci)導率很(hen)(hen)低(di)，如電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)工鋼B=0.5T時(shi)(shi)(shi)，其磁(ci)(ci)(ci)導率可以(yi)達(da)到(dao)0.00875-0.01T.當B=0.5T時(shi)(shi)(shi)，其磁(ci)(ci)(ci)導率僅為0.0750.0875*10-4TM/A.所以(yi)，對于(yu)永(yong)磁(ci)(ci)(ci)直流(liu)(liu)力矩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)，當它(ta)與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)樞(shu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)分離時(shi)(shi)(shi)，相反，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)樞(shu)加(jia)載(zai)到(dao)永(yong)磁(ci)(ci)(ci)定子(zi)(zi)(zi)后漏(lou)磁(ci)(ci)(ci)回路的(de)(de)(de)磁(ci)(ci)(ci)阻(zu)小(xiao)(xiao)(xiao)于(yu)磁(ci)(ci)(ci)鋼的(de)(de)(de)磁(ci)(ci)(ci)阻(zu)，所以(yi)測(ce)量(liang)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)值較(jiao)大。當其裝(zhuang)入永(yong)磁(ci)(ci)(ci)定子(zi)(zi)(zi)時(shi)(shi)(shi)，由(you)于(yu)磁(ci)(ci)(ci)鋼磁(ci)(ci)(ci)阻(zu)的(de)(de)(de)影響較(jiao)大，測(ce)量(liang)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)值較(jiao)小(xiao)(xiao)(xiao)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)樞(shu)裝(zhuang)入永(yong)磁(ci)(ci)(ci)定子(zi)(zi)(zi)后，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)減(jian)小(xiao)(xiao)(xiao)，有(you)利于(yu)永(yong)磁(ci)(ci)(ci)直流(liu)(liu)力矩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)的(de)(de)(de)運行(xing)。減(jian)小(xiao)(xiao)(xiao)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)樞(shu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)，可以(yi)減(jian)小(xiao)(xiao)(xiao)永(yong)磁(ci)(ci)(ci)直流(liu)(liu)力矩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)的(de)(de)(de)充(chong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi)(shi)(shi)間(jian)常數T,T=L/R,從(cong)而使電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)的(de)(de)(de)響應速(su)度(du)更快，這(zhe)是伺服電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)的(de)(de)(de)一個重(zhong)要(yao)指標。此(ci)外，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)感(gan)(gan)(gan)(gan)的(de)(de)(de)減(jian)小(xiao)(xiao)(xiao)也有(you)利于(yu)直流(liu)(liu)力矩電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)機(ji)(ji)的(de)(de)(de)換相。

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