电动机的旋转运动,通常通过丝杠螺母传动副转变成直线运动。日本Copal公司则把丝杠螺母与步进电动机合为一体,从步进电动机中直接输出直线运动。与前述分离式系统相比,这种驱动器明显地具有总体价格低、重量轻、体积小的优点,其结构及主要尺寸如图1所示(型号SPS20)。从图1中可以看出,丝杠右端通过扁身 Motor rotation, usually through the screw nut drive into vice-linear motion. Japan’s Copal put the screw nut and stepper motor into one, the direct output from the stepper motor linear motion. Compared with the above-mentioned separated system, this kind of driver obviously has the advantages of low overall cost, light weight and small size. Its structure and main dimensions are shown in Figure 1 (Model SPS20). As can be seen from Figure 1, the right end of the lead through the flat body