Multifrequency Resonant Compensated Wireless Power Transfer SRM Drive System

In this article, a multifrequency resonant compensated wireless power transfer (WPT) switched reluctance motor (SRM) with zero voltage switching (ZVS) capability is proposed. The system utilizes dual decoupled resonant tanks on the transmitting side and hybrid compensation on the receiving side to achieve multifrequency resonant WPT. In addition, the operating frequencies of the primary inverter are regulated to drive the corresponding SRM phases. The implementation of this method mainly consists of the following steps: First, the number and value of resonant frequencies were optimized to construct multiple power channels, thereby avoiding unexpected energy transfer between the main resonant circuits and overcurrent of the transmitter, and reducing cross-interference between channels. Then, the transmitting coils are overlapped to avoid internal magnetic connections, while the position of the receiving coils is adjusted to realize asymmetric coupling, thereby achieving current equalization in the SRM windings. Moreover, the optimized design of multifrequency resonant compensation networks is developed to reduce the system sensitivity to inductance mismatching and achieve the ZVS of the inverter with the minimized input impedance angle. After that, alternating excitation of single or dual phases can be achieved via a hybrid resonant excitation strategy. Finally, experiments were implemented in a 6/4 SRM-based test-bed, which verified the feasibility of the proposed system.