Determination of EMI of PWM fed Three Phase Induction Motor
Keywords:
EMI, EMC, AC drive, SVPWM, leakage current, bearing current, common mode voltages.Abstract
EMI (Electromagnetic Interference) testing is required for any electrical system especially for high frequency appliances for marketing. It is preferable to be tested it in earlier phase of design.In this paper, measurement of conducted EMI of PWM inverter fed 3phase induction motor has measured on FCC, part-15, class A standards. The standard line impedance stabilization network (LISN), and digital storage oscilloscope are used to measure high frequency leakage current. The LISN will prevent the EMI noise entering the system from the supply source by conductive methods, at the sometime prevents the EMI generated if any due to PWM, fast switching in the system, will not be allowed to enter the supply line. The results of both triggering method of IGBT compared and can be concluded that the SPWM method creates more EMI than SVPWM method.
