Theoretical and experimental analyses of a hybrid excitation synchronous generator with integrated brushless excitation

Abstract

This paper proposes a novel integrated brushless excitation method (IBEM) for a rotor-excited generator. IBEM is applied to a rotor-excited hybrid excitation synchronous generator (HESG) to realise brushless excitation while the key features of the rotor-excited generator are maintained. The new generator is referred as IBE HESG here. The stator excitation windings are buried in the stator slots. The static excitation field is established in the air gap when there is dc excitation current in the stator excitation windings. The three-phase armature coils of the rotor induce the static excitation field and provide the dc excitation current for the rotor excitation windings via a rotating rectifier. The operating principles are discussed theoretically. The magnetic field distribution and the operating characteristics are studied by finite-element analysis. The no-load, external, regulation and excitation characteristics are analysed. Compared with the brush excitation HESG, the rotor excitation current is able to meet the requirement and the output voltage is conveniently regulated by the stator excitation current. Finally, a 1.5 kVA prototype is fabricated to test the operating characteristics of IBE HESG. It demonstrates that the brushless excitation is realised and the output voltage is regulated by the stator excitation current.

Development of Brushless Claw Pole Electrical Excitation and Combined Permanent Magnet Hybrid Excitation Generator for Vehicles

“…To sum up, researchers have carried out in-depth research on parallel-structure HEGs and achieved certain research results that provide useful reference for the research and development of high-performance HEGs [18][19][20][21][22][23][24]. On this basis, this paper proposes a HEG with suspended brushless claw pole EER and combined magnetic pole PM rotor coaxially connected in parallel and sharing the same armature winding.…”

Design and direct field current control scheme of a synchronous generator with PM exciter based on the reference frequency

“…Furthermore, the mechanical slip ring can make an additional maintenance problem. A hybrid excitation method using both winding and PM flux was also researched [9][10][11]. Generator and exciter are designed as hybrid structures and the traditional rotating rectifier for the field winding was used.…”

Evaluation of a New Dual-Rotor Hybrid Excitation Brushless Motor

“…Besides, relatively small reluctance in the electromagnetic excitation portion (without PM) will improve the excitation current utilization ratio and reduce excitation loss. However, due to complexity of the machines, the PHEM of different structures still has its own problems [10][11][12]. The HEM needs to develop in the direction of simple structure, compact magnetic circuit structure, high power density, good performance of magnetic regulation and high reliability [13,14].…”