Design and Experimental Implementation Issues for Common Mode Compensation Devices in PWM Induction Motor Drives

In this paper a theoretical and experimental study focused on practical implementation issues for common mode disturbance compensation techniques, in PWM drives, is presented. In particular the detailed example of design and experimental set-up of a very effective compensation device, based on the idea of the active common-noise canceler, for a 380V-50 Hz PWM induction motor drive is discussed. The performance of the realized compensation device is then verified through experimental measurements of the main quantities involved in the common mode disturbance propagation phenomena also by a comparison with the effectiveness obtained by a conventional common mode choke, set-up on purpose. The presented results may be used as information and guidelines for improving and speeding up the development of new active compensation devices.