Comparative analysis of stepper motors in open loop and closed loop used in nuclear engineering

There are many uncertainties concerning the dynamic system of a stepper motor, which shows a precision control methods increasingly lower. The purpose of the study is to highlight the phenomena observed when SM control is used both in the loop and the loop, including the accuracy of the increased speed of the stepper motors. Due to delays in the closed loop, feedback analysis is not accurate and the terms subsequent incremental depending on the position of the closed loop dynamics. This paper will conduct a comparative analysis of the effect of the closed loop and open loop for stepper motor with permanent magnets used in nuclear engineering. Nondestructive examination main equipment used in the ICN Pitesti consist in universal machines controlled by stepper motors. Applications stepper motors are restricted to situations that do not require high power (usual powers between fields microwatt and kilowatt).