The dissertation discusses and analyzes particularly the structures and work theories of hybrid step motor and variable reluctance step motor . in particular , it puts emphases on theroretic study and technical argumention about subdivision control technique and drive circuit of step motor 本文通過對混合式和反應式兩種代表性步進電動機結構特點和工作原理的討論與分析,重點對步進電動機驅動電路、細分控制電路進行了理論研究與技術探討。