Electromagnetic radiation test of power driver module in optical tracking system and electromagnetic compatibility

In order to solve the conductive ring module´s interference problems, measured the electromagnetic radiation of Power drive module, and used test results analysis the electromagnetic compatibility of the conductive ring, identified and implemented appropriate EMC (electromagnetic compatibility) measures. When optical tracking system working, test equipment can not be fixed. Therefore, from the electromagnetic radiation theory, the paper analyzed the electromagnetic radiation of the power drive module. From it, determine the EMC pre-compliance test method for electromagnetic radiation of power drive module. Based on Test results, calculate the interference voltage of wire in Conductive ring, and then determine the corresponding EMC method. The results show that, when The power drive module Radiate Electromagnetic waves, wires would coupled common mode interference voltage, its frequency is 3MHz, amplitude is about 10V,it would interfered the operation of sensor. By reducing the area of ground loops, used shielded cables, final rule out the interference.