目前,在程控、数控和计算机控制系统中广泛运用了步进电机。因为通过掌握输入步进电机的脉冲个数,可以精确地控制步进电机的角位移输出,并且没有累积误差,也可通过改变输入脉冲频率控制其角速度,再将角度的改变转换成线位移、流量等物理量,以实现对这些物理量的控制。我国最近研制成功的XQF-1型显微分光光度计中就运用了步进电机,该仪器是用在生物学、医学等领域进行细胞定量测定分析的高级仪器,目前世界上只有少数发达国家能生产。此仪器中的关键部件扫描平台的精度要求很高,它要带动细胞切片移动,使光束在细胞内扫描,扫描步距为每步0.5μm,步进电机正是完成这种功能的理想工具。但步 Currently, stepper motors are widely used in program control, numerical control and computer control systems. Because by grasping the number of input stepper motor pulse, you can accurately control the angular displacement of the stepper motor output, and no cumulative error, but also by changing the input pulse frequency control of its angular velocity, and then change the angle into line displacement, Flow and other physical quantities, in order to achieve the control of these physical quantities. China recently developed the XQF-1 type of micro-spectrophotometer using a stepper motor, the instrument is used in biology, medicine and other areas of advanced quantitative determination of cellular instruments, the world only a few developed countries can produce. The key component of this instrument is the high accuracy of the scanning platform, which drives the cell slices to scan the beam in the cell with a step size of 0.5μm per step. The stepper motor is the ideal tool for this purpose. But step