Comprehensive Study of DVDT Filter for Motor Drive System with Long Cable Lead

This paper provides an in-depth analysis of the issues and challenges of motor drive systems in industrial application with long cable lead. Moreover, it presents a simple and economical filtering solution to these challenges under different system parameters and operating conditions. The system parameters include cable length, cable size, cable type, and drive system size. The operating conditions include switching frequency, output operating frequency, and loading condition. The motor peak voltage, which is the main concern in such applications, is investigated along with the power dissipation of the filter. Testing with three motor drive systems (10, 25 and 100HP) with different cable lengths (500-1500ft), different cable sizes (#8, #2, 4/O), and different cable types (VFD, TECK) are used to experimentally validate the design and analysis of this paper.