The Modeling and Calculation on an Air-Core Passive Compulsator

Abstract

Capacitor banks are used to provide a high pulsed power in traditional electromagnetic launch systems, but the large volume of these capacitors greatly limits the movability of the system; meanwhile, more and more applications require a system with significantly higher energy storage density. Rotation machines that can quickly convert rotational kinetic energy into high-current electrical energy have been designed and simulated. These generators are referred to as pulsed alternators. The shape of the high current pulse can be controlled by the triggering time of rectifiers. The direct-quadrature, or Park’s, transformation is used to model a generator for simulation. The pulsed alternator consists of four stator phases, a compensated device, and field winding on the rotor all coupled together electromagnetically, and the theory is based on the standard three-phase Park’s transformation and extends to six-phase systems to make analysis of the four-phase air-core alternator that has a compensation device. After modeling the compensator, we obtain the transformed stator-voltage equations and the flux-linkage current relationship. A method is presented in which the pulsed alternator can be accurately modeled and used to numerically analyze the basic principle of a passive compensator. Finally, we optimize the current using the genetic algorithm. It is shown that this method can simplify the calculation, accurately predict the performance of the system, and provide guidance on the design of the prototype.