Abstract
The third harmonic can be utilized in the contour of the permanent magnets to improve the output torque of surface-mounted permanent magnet machines (SPM). However, third harmonic component will be introduced in the airgap flux density which will result in variation of flux density distribution in the stator laminations and the stator iron losses. In this chapter, to analytically investigate the influence of additional third harmonic airgap flux density on the stator flux density and iron losses, the stator laminations are decomposed into three parts, i.e., tooth tips, tooth body and stator yoke. The 12-slot/10-pole machines with Sine, Sine+1/6 3rd, and 1.15(Sine+1/6 3rd) PM shaped rotor are employed for discussion. It is found that, in tooth body and stator yoke, the classical eddy current loss will increase for both Sine+1/6 3rd, and 1.15(Sine+1/6 3rd) PM shaped machines compared to one with Sine-shaped PM rotor, while in tooth tips the hysteresis loss will decrease for machines with Sine+1/6 3rd PM shaped rotor and rise for ones with 1.15(Sine+1/6 3rd) PM shaped rotor. Further, the thermal distribution in stator laminations is carried out on three different PM shaped rotor by FE software, which verifies the aforementioned conclusion.
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Wang, K., Zhu, ZQ. (2019). Investigation of Stator Flux Density and Iron Loss in 3rd Order Harmonic Shaped Surface-Mounted Permanent Magnet Machines. In: Third Harmonic Utilization in Permanent Magnet Machines. Springer, Singapore. https://doi.org/10.1007/978-981-13-0629-7_6
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DOI: https://doi.org/10.1007/978-981-13-0629-7_6
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