Research on the optimization about air-gap magnetic field of AC-excited generator

Abstract

Due that the air-gap harmonic wave magnetic field impacts the motor torque property, additional loss and vibration noise, it is critically important to accurately calculate the electromagnetic field, particularly the air-gap magnetic field distribution. On the basis of the research of structure of AC-excited generator, a field-circuit-motion coupled analysis model for AC-excited generator is established using field-circuit-motion coupling method. For investigating the relationship among the air-gap magnetic field, slot of rotor, air-gap and width of rotor slot, the distribution diagram of air-gap magnetic field is provided under different states. By harmonic analysis of the air-gap magnetic field of different model, the method to reduce the air-gap harmonic wave magnetic field is proposed. It provides the theoretical support for the optimization design of AC-excited generator.