新的步進電機ICS簡化安全攝像頭定位設計

　　安全的關注推動了安防監控攝像機的使用大量增加，經常與高分辨率的CCD或CMOS成像器，系入云的生物識別和面部識別分析為基礎的視頻分析。

　　然而，生物識別算法正常工作，相機定位系統必須有平滑的操作，以避免不必要的圖像失真，而相機在運動。許多應用程序的自由裁量權或遠程訪問的要求也要求該系統緊湊和節能

　　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.