Abstract
The article presents the results from numerical calculation of the electromagnetic field for three different design versions of permanent magnets used in highsp eed mini turbine generators: with radially magnetized annular sectors, and with solid and hollow cylinders magnetized over the diameter. It has been found from a comparative investigation that permanent magnets in the form of solid and hollow cylinders magnetized over the diameter can be made with smaller diameter and active length as compared with their versions magnetized over the radius. Additional advantages of the design version in the form of a solid (hollow) cylinder magnetized over the diameter are that the i nduction distribution curve in the air gap contains almost no higherorder harmonic components, that the machine has higher synchronizing torque values, and that the probability of magnet failurefree opera tion at the working temperatures is close to unity.
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