2-D Exact Analytical Model for Surface-Mounted Permanent-Magnet Motors With Semi-Closed Slots.

Thierry Lubin (1) , Smail Mezani (1) , Abderrezak Rezzoug (1)

1 GREEN - Groupe de Recherche en Electrotechnique et Electronique de Nancy

This paper presents an analytical subdomain model to compute the magnetic field distribution in surface-mounted permanent-magnet (PM) motors with semi-closed slots. The proposed model is sufficiently general to be used with any pole and slot combinations including fractional slot machines with distributed or concentrated windings. The model accurately accounts for armature reaction magnetic field and mutual influence between the slots. The analytical method is based on the resolution of two-dimensional Laplace's and Poisson's equations in polar coordinates (by the separation of variables technique) for each subdomain, i.e., magnet, air gap, slot-opening, and slots. Magnetic field distributions, back-EMF, and electromagnetic torque (including cogging torque) computed with the proposed analytical method are compared with those issued from finite-element analyses.

Mots clés: Analytical solution; armature reaction field; cogging torque; permanent-magnet machine; semi-closed slot

Domaines: Energie électrique

Thierry Lubin, Smail Mezani, Abderrezak Rezzoug. 2-D Exact Analytical Model for Surface-Mounted Permanent-Magnet Motors With Semi-Closed Slots.. IEEE Transactions on Magnetics, 2011, 47 (2), pp.479-492. ⟨10.1109/TMAG.2010.2095874⟩. ⟨hal-00558543⟩