Synchronous motor using ferrite magnets for general purpose energy efficient drive

A synchronous motor using ferrite magnets has the potential for energy saving in general applications such as fan, pump and compressor drives. A rotor geometry is suggested for this machine which eliminates the drawbacks of the conventionally used rotor geometries and gives higher airgap flux density. The performance of this machine with the proposed rotor geometry is compared with the conventional geometries for the same magnet volume and conductor density, employing field based circuit analysis. The performance of the machine for different operating conditions and asynchronous performance are also presented. The machine is also modified to suit the inverter fed drive