Comparison of an Active Stator and a 3-phase synchronous machine

The electromagnetic developed torque of a conventional three-phase machine is compared with that of the same machine rearranged as an Active Stator machine, a new multiphase machine concept developed by Converteam UK Ltd. The comparison is made by using analytical methods and Finite Element solutions. Relations describing the average developed torque are derived for both three phase and AS machines. For the same physical dimensions the AS machine produces higher developed torque, offering an economical alternative to conventional machines especially in applications with very low to medium speeds such as the wind energy sector.