High Torque Density Electrical Machine with Less Rare Earth Permanent Magnet

The All-Electric-Aircraft and spacecraft is seeking for high torque density electrical machine to achieve high torque output with lower mass to get higher capability of loading and reduce the cost. The rare earth permanent magnet cannot stand the overheating temperature in outer space thus has the risk of demagnetization causing the space devices out of work. This paper proposes a new magnet topology structure in electrical machine. Compared with other traditional permanent magnet topology structures, it produces a higher magnetic flux density and torque value and decreases the mass of machine, which confirms the proposed magnet topology effectivity in enhance torque density (Nm/kg).