Simplified analysis technique for double layer non-overlap multiphase slip permanent magnet couplings in wind energy applications

In this paper a simplified technique to allow for the dq modelling of a double layer, non-overlap, multiphase slip permanent magnet coupling is introduced. The proposed technique can also be used where the active conductor areas of the upper and lower coils do not match. This technique enables a machine designer to optimise these types of machines using static finite element solutions, which are considerably faster than transient solutions. In this paper the proposed technique is illustrated by detailing the design procedure for a 2.2 kW slip permanent magnet coupling, with an efficiency of 97% at rated load.