Design of Halbach hybrid excitation compulsator

Pulsed alternators integrate kinetic energy storage, electromechanical energy conversion and pulse shaping in one unit, and it is the research focused on the field of pulsed power sources. The electrical excitation and the permanent magnet excitation are contained in one hybrid excitation pulsed generator together in which the advantages of two different excitation types are integrated. The brush slip ring mechanism with low reliability and high maintenance costs can be cancelled. And the electromagnetic field can be adjusted quickly by external electrical excitation source and correspondingly the performance can be quickly adjusted. An all-iron-core hybrid excitation compulsator prototype had been designed, fabricated and optimized. The hybrid excitation concept was validated in the research of compulsator. Although the compulsator researches are mainly focused on the all-air-core electrical excitation topology, there exist some bottleneck technologies which restrict the application of compulsator in actual fields. The hybrid excitation compulsator can decrease the cost, increase the reliability and widen the application scope of compulsator, especially in the middle-low power range. Halbach array is a permanent magnet arrangement structure which is a combination structure of different directions arrays. The Halbach array offers a number of attractive features in comparison with the normal array one. And the air-gap magnetic flux can be increased and the rotor yoke magnetic flux is decreased. Based on it, the Halbach array can be designed on the composite rotor core. A part-air-core compulsator which includes an air-core rotor and an iron-core stator was designed. For analyzing the electromagnetic design results, the three dimensional model was built and finite element analysis method was used. The performances simulation results of the Halbach hybrid excitation compulsator were presented.