在對(duì)話框下部分設(shè)置整個(gè)模型的對(duì)稱性。當(dāng)磁場(chǎng)HT93LC66-A 關(guān)于某一坐標(biāo)軸平面(=y平面、yz平面或zx平面)對(duì)稱,即ReHection in coordinate planes,如果磁場(chǎng)垂直于該平面,那么滿足法向?qū)ΨQ性Normal magnetic;如果磁場(chǎng)平行于該平面,那么滿足切向?qū)ΨQ性Tangential magnetic。當(dāng)磁場(chǎng)關(guān)于z軸軸對(duì)稱或者關(guān)于z軸周期性對(duì)稱,即Rotationa1symmetryaround Z,如果磁場(chǎng)垂直于該周期交界面,那么滿足法向?qū)ΨQ性Normal magnetic;如果磁場(chǎng)平行于該周期交接面,那么滿足切向?qū)ΨQ性Tangential magnetic。本例的模型中,可分析出空間磁場(chǎng)是關(guān)于z軸軸對(duì)稱,且是切向?qū)ΨQ性的情況,囚此可忽略設(shè)置RcⅡection inc°ordinate planes的選項(xiàng),而設(shè)置Rota1ional symmetry around Z的選項(xiàng)。其中,設(shè)置Symmetry type為T(mén)ange1△tial mabonetic;設(shè)置Number°f symmctry∞pics,該選項(xiàng)為軸對(duì)稱或者周期性問(wèn)題時(shí)將繞z軸的圓周方向分為若干份,對(duì)于軸對(duì)稱問(wèn)題,份數(shù)越多有限元模型將成比例地變小,計(jì)算量將大幅下降,但對(duì)網(wǎng)格質(zhì)量也會(huì)有不利影響,對(duì)于周期性問(wèn)題,份數(shù)即繞z軸一周含有的周期數(shù)。一般來(lái)說(shuō),無(wú)須對(duì)空氣域的外圍邊界進(jìn)行特別設(shè)定(即對(duì)話框中的Far Ⅱeld b°undary∞nditions選項(xiàng)卡),Opera3D會(huì)自行設(shè)定。