Wang Xin-wei

The Study of Structure and Characteristic of a New Type HECPSG

A new type of hybrid excitation claw-pole synchronous generators (HECPSG) was made to solve the power density lowness of the electric excitation claw-pole machine and the difficulty of magnetic field regulation of permanent magnet(PM) claw-pole machine. According to electrical machine principle, a emulated calculation was made on this new type machine in the way of magnet circuit and three dimension finite element method (FEM), the thesis also discussing its non-load and regulation characteristic and makes a comparison on the property among this new type electric machine and traditional claw-pole synchronous generator, permanent magnet claw-pole machine.

The Structure Optimization of IPM Synchronous Machine

The non-magnetism bush of IPM synchronous machine can efficiently reduce the leakage flux near shaft. However, it brings two defects which make the structure of the machine complex and the usable space of the PM reducing. This paper studies the non-magnetism bush of IPM synchronous machine, and then discusses the influence on machine performance when auxiliary pole was introduced, and it also presents the restriction condition of the magnet width in given condition and compares the air gap flux density and the per pole flux in two conditions which the shaft material is magnetism or non-magnetism, by neglecting the non-magnetism bush and auxiliary magnet when the magnet width reaches maximum. From that, we can draw conclusions as follows: (1) Not only does the introduction of the auxiliary pole lead to the removal of the non-magnetism bush but also the improvement of machine property; (2) Given constant figures of machine diameter and magnet thickness, the machine performance can also be improved when magnet width reaches maximum value while non-magnetism bush is removed.