Performance Comparison of Longitudinal Flux and Transverse Flux Permanent Magnet Machines for Turret Applications With Large Diameter

The aim of this paper is to provide performance comparisons between conventional longitudinal flux and transverse flux permanent-magnet machines using three-dimensional finite element analysis considering both electro-magnetic and mechanical fields. For a turret application with 2 meters in diameter size, not only electro-magnetic performance but also mechanical structural strength is important. Therefore, the comparison is focused on the torque density, machine efficiency, time constant, magnetic forces, and mechanical equivalent stresses occurred by the magnetic forces. For a specific turret application without an external cooling system, the obtained results provide an indication on which type of the machines is best suited regarding performance and size.