A new analytical torque formula for axial field permanent magnets coupling

Bastien Dolisy (1) , Smail Mezani (1) , Thierry Lubin (1) , Jean Lévêque (1)

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

In this paper, we present a simple and accurate analytical expression to compute the torque of axial-field magnetic couplings. The torque expression is obtained by solving the three-dimensional (3D) Maxwell equations by the method of separation of variables. Here we adopt the assumption of linearization at the mean radius, the problem is then solved in 3D Cartesian coordinate (we neglect the curvature effects). To show the accuracy of the torque formula, the results are compared with those obtained with 3D finite-element simulations, and experimental tests. As the proposed formula needs very low computational time and depends directly on the geometrical parameters, it is used for a design optimization using multiobjective genetic algorithms.

Mots clés: Index Terms— Genetic algorithms; magnetic coupling; permanent magnets; torque transmission; 3D analytical model

Domaines: Energie électrique; Electromagnétisme; Supraconductivité [cond-mat.supr-con]

Bastien Dolisy, Smail Mezani, Thierry Lubin, Jean Lévêque. A new analytical torque formula for axial field permanent magnets coupling. IEEE Transactions on Energy Conversion, 2015, 8 p. ⟨10.1109/TEC.2015.2424159⟩. ⟨hal-01164388⟩