新的步进电机ICS简化安全摄像头定位设计

　　新的步进电机ICS简化安全摄像头定位设计

　　安全的关注推动了安防监控摄像机的使用大量增加，经常与高分辨率的CCD或CMOS成像器，系入云的生物识别和面部识别分析为基础的视频分析。

　　然而，生物识别算法正常工作，相机定位系统必须有平滑的操作，以避免不必要的图像失真，而相机在运动。许多应用程序的自由裁量权或远程访问的要求也要求该系统紧凑和节能

　　Linear servomotor positioning systems can provide the smooth operation required but they come at the expense of higher power and the need for high-resolution encoders and precision circuitry. Alternatively， stepper motors have several attractive features for video surveillance positioning， including full torque at standstill， excellent start， stop， and reverse response times， repeatability of movement without error accumulation， and simple open-loop control with a fixed step size.

　　However， the fixed step size is a limitation – even a 200 step/rotation motor will have a step size of 1.8° which is not smooth enough for high-resolution video. This can be overcome with microstepping， and new microstepping driver ICs are enabling designers to quickly realize compact high-resolution， low-power positioning systems.