新的步進(jìn)電機(jī)ICS簡(jiǎn)化安全攝像頭定位設(shè)計(jì)

　　安全的關(guān)注推動(dòng)了安防監(jiān)控?cái)z像機(jī)的使用大量增加，經(jīng)常與高分辨率的CCD或CMOS成像器，系入云的生物識(shí)別和面部識(shí)別分析為基礎(chǔ)的視頻分析。

　　然而，生物識(shí)別算法正常工作，相機(jī)定位系統(tǒng)必須有平滑的操作，以避免不必要的圖像失真，而相機(jī)在運(yùn)動(dòng)。許多應(yīng)用程序的自由裁量權(quán)或遠(yuǎn)程訪問(wèn)的要求也要求該系統(tǒng)緊湊和節(jié)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.