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Design of fractional-slot permanent magnet synchronous motor with concentrated windings and interior permanent magnets

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The paper presents design of fractional-slot permanent magnet synchronous motors with concentrated windings and interior permanent magnets. Inner PM rotor machines with 12 slot/8 poles and 12 slot/10 poles were investigated. Finite element analysis is employed in order to determine the performance of each motor. It is shown that the maximal torque capability and the flux-weakening performance of the particular machine are strongly dependent on the stator slot number/rotor pole number combination, rotor barrier design and on the quality of used PM material. Streszczenie. W artykule przedstawiono projekt silnika synchronicznego z magnesami trwałymi (IPMSM) o uzwojeniu ułamkowo-żłobkowym. Badaniom poddano maszyny PMSM o stosunku żłobki/bieguny 12/8 oraz 12/10. Zastosowano analizę metodą elementów skończonych. Wykazano, że maksymalny moment mechaniczny oraz osłabianie strumienia są silnie zależne od stosunku ilości żłobków stojana do liczby par biegunów wirnika oraz jakości materiałów. (Projekt silnika synchronicznego z magnesami trwałymi zagłębionymi w wirniku o uzwojeniu ułamkowożłobkowym skupionym). Keywords: synchronous machine, interior permanent magnets, concentrated windings. Słowa kluczowe: maszyna synchrnoniczna, magnesy trwałe zagłębione w wirniku, uzwojenie skupione. Introduction Fractional-slot permanent magnet (PM) synchronous motors with concentrated windings have in recent years received particular attention due to several important advantages in comparison to the machines with distributed windings. These advantages can be shortly assembled in the following sentences: shorter end winding length when the machine is built in concentrated non-overlapping stator windings technology; higher slot fill factor in comparison to the machines with distributed windings; good flux weakening performance; high torque and fault tolerant capability; good efficiency, etc. 1-8. The main disadvantages of fractional-slot PM ma[...]

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