An Active-Rectifier Wireless Motor System With Dual-Side Phase Shift Control for Phase Synchronization and Efficiency Optimization

The wireless motor system has garnered significant interest in recent times. However, its efficiency is inevitably reduced due to the mismatch between the equivalent and optimal load resistances under varying motor speeds and torques. In response, this article introduces a novel active-rectifier wireless motor (AR-WM) system with dual-side phase shift control (DS-PSC) to not only synchronize dual-side phases eliminating reactive power, but also maximize the system efficiency. First, by detecting the zero-crossing point of the secondary resonant current, the phase angle between two converters on both sides is locked at 90 ^{\circ } to maintain the real-time frequency synchronization. Second, the primary-side PSC determines the load voltage for regulating the motor speed, while the secondary-side PSC is responsible for achieving dual-side zero phase angle by synchronizing dual-side phases and tracking the maximum efficiency point by rapidly tuning the equivalent impedance. Besides, to improve the dynamic performance of the AR-WM system, an integral finite-time control approach is utilized, resulting in a 43.89% reduction in speed response time compared to the traditional PI control method. Finally, a 180 W experimental prototype is built with a maximum system efficiency of 92.37% at a transfer distance of 10 cm.