Magnetic field modulation mechanism and characteristic simulation of electrically excited brushless synchronous machine

Due to the energy and environment issues, the conventional automobile industry is changing to “electric”. Electric machine drive system is the core component of the electric vehicle and it is the research focus of the area. This paper proposes brushless electric excitation synchronous machine with hybrid rotor which is a new type of AC machine. There are two sets of windings with different pole numbers on the stator. It eliminates the brushes and slip rings which make the structure more simple and strong. In this paper, the structure characteristic and working principle of electric brushless excitation synchronous machine were introduced. The air-gap magnetic field of this kind of motor is analyzed, thus it further reveals this kind of machine´s magnetic field modulation principle and mechanism of electromechanical energy conversion. Based on the finite element analysis, influence of different exciting winding´s pole number on the coupling ability was comparatively studied. On this basis the characteristics of this kind of machine is studied and electric operation state are respectively simulated. Through the simulation, it can be seen that the machine has good static and dynamic characteristics and it lays the theoretical basis for development of this kind of machine.