Design Comparison of Two Rotating Electrical Machines for 42V Electric Power Steering

The proposed paper presents two design procedures of rotating electrical machines for 42V embedded application. Particularly, for an electrical power steering, a three-phase interior permanent magnet synchronous machine (PMSM) fed by a switch redundant power converter and a six-phase induction machine (IM6) fed by a new type of six switches converter are designed for future 42V DC system. For the PMSM, the magnetic circuit has been fully designed using the optimization from analytic and finite-element based software. For the IM6, a classical magnetic circuit coming from a traditional three-phase squirrel-cage low power induction machine has been used. The final design results are compared on the basis of the power-to-weight ratio.