Improved analytical modeling of an ellipse-shaped permanent magnet rotor in ultra-high-speed synchronous motor by electromagnetic field theory

Owing to their high efficiency and power density, high-speed permanent magnet (PM) brushless machines are emerging as a key technology for applications as varied as spindle drives, centrifugal compressors, turbo-molecular pumps, gas-turbine generator units, and electric/hybrid vehicle traction systems [1].