High Torque Density PM Machines for High Performance Operation

This paper looks at different construction methods and coil winding techniques for fractional slot, high torque density permanent magnet synchronous machines intended for high performance aerospace applications. Whilst mechanical gearing is often used to reduce the size and mass of an electromechanical system by operating the machine at high speeds this paper shows that by utilizing machine topologies with low number of slots per pole a better power density can be achieved without any mechanical gearing.