Design tradeoffs between starting and steady state performances of line-started interior permanent magnet synchronous motor

This paper studying starting, synchronization and steady state characteristics of five line start interior permanent magnet synchronous motors (LSIPMSMs). The overall performance of new and conventional types of LSIPMSMs with different rotor magnet shapes is analyzed and compared. All the proposed LSIPMSMs are with the same squirrel cage design, materials, stator and rotor slots geometry and stator winding design. In addition, the permanent magnets of all the motors have the same dimensions and are made from the same material. The starting and synchronization of the motors is studied under no load, full load, and high inertia. In steady state operation, the performance of the LSIPMSMS fed from sinusoidal is analyzed. The efficiency, power factor and torque ripples values are computed and compared under different load torque values. Two-dimension time steeping finite element method (FEM) is employed in analysis of the performance of LSIPMSMs.