Feasibility Study of Using Modified Single-Phase Wireless Power Transfer System for Three-Phases Motor Driving

Conventional integration of Wireless Power Transmission (WPT) system with electric motor drive system seems not to be a desirable solution in some aspects like reliability, economic, sizing and numbers of power conversion. This is because of using two independent sets of switching converters at the primary and secondary side of WPT system as well as isolating DC link between these two systems. The primary sets act as high-frequency amplifier and the secondary one converts the induced power to low frequency one to feed the motor. These drawbacks will be more dominant even in three-phases motor drive applications. In this paper, a modified nine-switches topology is proposed in the secondary side of WPT system which is using high-frequency AC link voltage and converting it directly to three-phases low-frequency one to supply three-phases motor. This is carried out without using any rectification circuit and DC link as interface. Despite the lower cost of this system, it is also capable of direct drive of the motor from the primary side of WPT system. Unlike the conventional topology, the topology proposed in this paper has less switches as well as lower voltage oscillation with the same performance. Some quantified comparisons have been done in both theory and simulation which shows the superiority of the proposed system.