直線電機的推力是直(zhi)線電(dian)(dian)機(ji)的(de)主(zhu)要指標參(can)(can)數(shu)，一般分為(wei)額定(ding)的(de)推(tui)(tui)力和大推(tui)(tui)力。伺服電(dian)(dian)機(ji)的(de)額定(ding)轉矩較(jiao)大，伺服電(dian)(dian)機(ji)的(de)額定(ding)轉矩較(jiao)大，主(zhu)要參(can)(can)數(shu)為(wei)電(dian)(dian)機(ji)型號的(de)選擇。電(dian)(dian)動(dong)機(ji)的(de)峰值推(tui)(tui)力決定(ding)于電(dian)(dian)動(dong)機(ji)的(de)電(dian)(dian)磁(ci)結(jie)構的(de)安(an)全(quan)程度。

　　直(zhi)(zhi)線(xian)(xian)電(dian)(dian)(dian)機(ji)(ji)具(ju)有較(jiao)高(gao)(gao)的(de)(de)電(dian)(dian)(dian)負荷。為(wei)了提高(gao)(gao)直(zhi)(zhi)線(xian)(xian)電(dian)(dian)(dian)機(ji)(ji)的(de)(de)推力密度，利(li)用溫度場的(de)(de)熱(re)電(dian)(dian)(dian)路對直(zhi)(zhi)線(xian)(xian)電(dian)(dian)(dian)機(ji)(ji)的(de)(de)溫度和(he)溫升分布進(jin)行了分析，繞組參(can)數設(she)計時，通過(guo)調整繞組線(xian)(xian)圈(quan)數等參(can)數以獲(huo)得適當(dang)的(de)(de)反電(dian)(dian)(dian)動參(can)數，直(zhi)(zhi)線(xian)(xian)電(dian)(dian)(dian)機(ji)(ji)達到高(gao)(gao)速指標(biao)應當(dang)提高(gao)(gao)反電(dian)(dian)(dian)動勢(shi)不變的(de)(de)前提下，為(wei)了提高(gao)(gao)單位電(dian)(dian)(dian)流產生的(de)(de)推力，以進(jin)一步提高(gao)(gao)直(zhi)(zhi)線(xian)(xian)電(dian)(dian)(dian)機(ji)(ji)推力密度。探討了永(yong)(yong)磁(ci)直(zhi)(zhi)線(xian)(xian)電(dian)(dian)(dian)機(ji)(ji)端(duan)部效應引起的(de)(de)端(duan)部力的(de)(de)較(jiao)小的(de)(de)問題。基(ji)于(yu)磁(ci)導波理論，通過(guo)優化原始長度，改變永(yong)(yong)磁(ci)直(zhi)(zhi)線(xian)(xian)電(dian)(dian)(dian)機(ji)(ji)兩端(duan)磁(ci)導波的(de)(de)相位，從而減小未端(duan)力。

　　直線(xian)電機(ji)的上述設計使得直線(xian)電機(ji)比機(ji)械系統有(you)許(xu)多(duo)獨特的優點(dian)，如(ru)在高(gao)速和低(di)速、高(gao)加(jia)速度、幾(ji)乎零尺寸、高(gao)精度、無空回(hui)。直線(xian)運動是由沒有(you)齒(chi)輪、聯軸器或滑輪的電機(ji)完成，這(zhe)對許(xu)多(duo)應用來說是有(you)意(yi)義的，因為它消除了(le)那些沒有(you)降低(di)性能(neng)和縮短壽命的不必要的部件。