Control of a hybrid excitation machine with open-winding structure for hybrid electric vehicles

Vector-controlled permanent magnet machine with open-winding structure can realize voltage regulation over a wide speed range and improve the generator power factor as well as the system integration degree when used in Hybrid Electric Vehicles (HEV). However, it is difficult for the above system to control the energy distribution between the battery and the engine. Hence, in order to realize the energy distribution control in multi-energy powertrain of HEV, a hybrid excitation generator system with open-winding structure is investigated in this paper and a double closed-loop control of battery current and generator excitation current is employed. Simulation results demonstrate the feasibility and effectiveness of the energy distribution control scheme.