Magnetic and Electrical Design Challenges of Inverter-Fed Permanent Magnet Synchronous Motors

Abstract

This work provides new magnetic and electrical design guidelines for an integrated motor-drive system. Two significant design factors including the electric and magnetic loadings are targeted to address the issues associated with the combination of the motor and inverter performances. A set of new constraints are also introduced in terms of the magnetic, electrical and thermal limits of a field oriented controlled permanent magnet motor to highlight the corresponding design challenges. Moreover, the demagnetization proximity limit is incorporated to ensure a reliable and safe operation of the permanent magnet material. The results show that the magnetic and electrical requirements of an efficient integrated system are totally different from the efficient performances of either side of the system, the motor or the inverter. Finally, considering a proper efficiency/reliability trade-off, an optimally designed integrated system is proposed with the goal of reducing the torque ripple and the system cost.