A primary-permanent-magnet vernier linear machine with improved fault-tolerant capability

This paper proposes and analyzes a new three-phase primary permanent-magnet fault-tolerant vernier (PPMFTV) linear machine. The key of this new machine topology is to adopt the concept of fault-tolerant teeth (FTT) to provide the desired decoupling among phases. The electromagnetic performances of the newly designed machine are analyzed including the flux, configuration, back-EMF, inductance, fault tolerance, thrust ripple as well as thrust density. The finite-element analysis (FEA) results show that the proposed PPMFTV machine not only retains the merits of primary-PM vernier machines, but also offers lower thrust ripple, higher thrust density and higher fault-tolerant capability.