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I'm working on a project with a PMSM. As I go through the literature I come across the following terms and wanted to make sure that I am getting right which ones are synonyms.

Surface-mounted PM = Non-salient pole rotor = Round Rotor = Cylindrical (in this case Inductances \$L_d\$ and \$L_q\$ are equal)

Interior Mounted PM = Buried PM = Salient pole rotor (in this case \$L_q \neq L_q\$)

Is that right?

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  • \$\begingroup\$ When you say 'round rotor' for the surface PM rotor, that means the steel hub, and with magnet arcs of uniform radial thickness. For surface PM rotors with breadloaf-shaped magnets, or magnets that don't cover the full circumference and have positioning nubs on the hub, the Ld and Lq values will still not be quite equal. \$\endgroup\$
    – Phil G
    Commented Oct 2, 2019 at 13:38

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You are correct !

Burried magnet change the permitivity distribution inside the rotor. Thus depending on the arrangement of the magnets, asymetrising its direct and quadratic inductances.

Look at this post: Explanation of Lq, Ld and how it relates to motor inductance

And this paper (if you can): https://doi.org/10.1109/emobility.2010.5668074

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