ANALYTICAL OPTIMIZATION OF THE TORQUE OF A PERMANENT-MAGNET COAXIAL SYNCHRONOUS COUPLING

This paper recalls the analytical formula of the tangential force betw een two permanent magnets and shows that this force does not vary line arly with the magnet depth. This formula is then applied to calculate the torque transmitted bg a permanent magnet coaxial synchronous coupl ing. Such an analytical approach allows the analysis of the influence of various parameters characteristic of this coupling such as the numb er of pairs of poles, its mechanical airgap, the magnet width and magn et-length, the mean radius of the airgap, and the angular shifting bet ween the two rotors. These analytical expressions make an efficient op timization of the coupling structure in compliance with practical or e conomical constraints possible.