Comparison of magnetic circuits of electrical machines with permanent magnets

Abstract

This paper presents results of simulation researches conducted on magnetic circuits of selected electrical machines excited by permanent magnets. The advantages of this type of machines are: high efficiency, relatively simple construction, smaller material consumption when compared to other machines, as well as lower production and exploitation costs. The examined magnetic circuits have the same stator, although they differ in the construction of the rotor, on which the permanent magnets are located. An identical number of magnetic poles and volume of electromotive force sources have been assumed for all of the models. The data, obtained through research carried out with the assumed average value of electromagnetic torque, magnetic flux density and theirs pulses, have been discussed. The conducted analysis indicated optimal design solutions for smaller oscillations and the maximum value of average electromagnetic torque