A New Analytical Torque Formula for Axial Field Permanent Magnets Coupling

• Published in: IEEE transactions on energy conversion Vol. 30; no. 3; pp. 892 - 899
• Main Authors: Dolisy, Bastien, Mezani, Smail, Lubin, Thierry, Leveque, Jean
• Format: Journal Article
• Language: English
• Published: IEEE 01-09-2015; Institute of Electrical and Electronics Engineers
• Subjects: Condensed Matter; Couplings; Electric power; Electromagnetism; Engineering Sciences; Genetic algorithms; Iron; magnetic coupling; Magnetic domains; Magnetomechanical effects; Magnetostatics; permanent magnets; Physics; Rotors; Superconductivity; three-dimensional (3-D) analytical model; Torque; torque transmission; magnetic coupling; three-dimensional (3-D) analytical model; permanent magnets; torque transmission; Genetic algorithms; 3D analytical model; Index Terms— Genetic algorithms
• ISSN: 0885-8969; 1558-0059
• DOI: 10.1109/TEC.2015.2424159

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 (3-D) 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 3-D Cartesian coordinate (we neglect the curvature effects). To show the accuracy of the torque formula, the results are compared with those obtained from 3-D finite-element simulations and from 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.