Coreless axial flux permanent-magnet machines

The paper presents construction and principles of operation of coreless axial flux PM machine. In its construction new solution of stator windings' mounting was used, that allowed to exploit active parts of machine more efficiently. Electric disc motors have small axial dimensions and can be installed directly in constructions of machine tools, technological devices and independent means of transportation. The interest in disc machines has grown recently due to introduction into operation new slotless and coreless constructions that allow, by using SEMA (Segmented ElectroMagnetic Array) technology, not only to eliminate ferromagnetic yokes and stator's cores, but also to increase its efficiency, decrease weight and size and decrease level of noises and vibrations of machine during its operation. There was also presented three dimensional model of machine and its parameters and characteristics obtained due to simulation. Results of this simulation were verified with experimental measurements conducted on physical model. To verify numeric model by comparing it to physical model, a dependence of electromagnetic torque from phase winding's constant current was determined for static state

Comparison of magnetic circuits of electrical machines with permanent magnets

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