A Primary-Side Control Method of Wireless Power Transfer for Motor Electric Excitation

Abstract

In this paper, a wireless power transfer (WPT) system is proposed to realize brushless electrically excited synchronous motor (EESM). Due to the rotation on the secondary side, a primary-side control is used to obtain preset output current and avoid the influence of the load variation in motor operation. Considering the need of load parameter as rotor resistance in motor control, two current detection are applied on the primary side to acquire the accurate models of secondary side current, and harmonics of the inverter output voltage are considered to modify the current model. Based on the simulation and experimental results, it proves that the current models from primary side current are close to the truth. Moreover, the proposed WPT system is capable of implementing primary-side control for motor excitation.