在對永磁電機設計時，一般都要考慮到磁鋼的(de)(de)磁(ci)(ci)(ci)穩定(ding)(ding)(ding)性(xing)。所(suo)謂的(de)(de)穩定(ding)(ding)(ding)性(xing)是(shi)永磁(ci)(ci)(ci)材料的(de)(de)重(zhong)要參數。影(ying)響電(dian)機磁(ci)(ci)(ci)鋼(gang)穩定(ding)(ding)(ding)性(xing)的(de)(de)外(wai)(wai)(wai)界(jie)(jie)(jie)條件有許多種，其中(zhong)主要是(shi)溫度(du)、時間、外(wai)(wai)(wai)磁(ci)(ci)(ci)場、化(hua)(hua)(hua)學腐蝕、輻(fu)射、機械振(zhen)動或(huo)撞擊(ji)等因素。外(wai)(wai)(wai)界(jie)(jie)(jie)條件的(de)(de)變(bian)(bian)(bian)化(hua)(hua)(hua)主要引起磁(ci)(ci)(ci)性(xing)能(neng)兩(liang)方面(mian)的(de)(de)變(bian)(bian)(bian)化(hua)(hua)(hua)：一種是(shi)磁(ci)(ci)(ci)疇結構(gou)的(de)(de)變(bian)(bian)(bian)化(hua)(hua)(hua)，這種變(bian)(bian)(bian)化(hua)(hua)(hua)是(shi)可(ke)逆的(de)(de)，即是(shi)可(ke)恢復(fu)的(de)(de)；另一種是(shi)電(dian)機磁(ci)(ci)(ci)鋼(gang)組織結構(gou)的(de)(de)變(bian)(bian)(bian)化(hua)(hua)(hua)，這種變(bian)(bian)(bian)化(hua)(hua)(hua)是(shi)不可(ke)恢復(fu)的(de)(de)。一般情況下(xia)，外(wai)(wai)(wai)界(jie)(jie)(jie)影(ying)響導(dao)致磁(ci)(ci)(ci)性(xing)能(neng)的(de)(de)變(bian)(bian)(bian)化(hua)(hua)(hua)都可(ke)能(neng)包括這兩(liang)種變(bian)(bian)(bian)化(hua)(hua)(hua)。對于(yu)電(dian)機磁(ci)(ci)(ci)鋼(gang)，我們在使用中(zhong)關(guan)心的(de)(de)是(shi)溫度(du)穩定(ding)(ding)(ding)性(xing)、時間穩定(ding)(ding)(ding)性(xing)、外(wai)(wai)(wai)磁(ci)(ci)(ci)場穩定(ding)(ding)(ding)性(xing)及化(hua)(hua)(hua)學穩定(ding)(ding)(ding)性(xing)。