Copper Rotor Motors and Permanent Magnet Motors: An Efficiency Comparison

摘要

For many years, industry claims have stated that the superior efficiency of Permanent Magnet Motors (PMM) would soon replace induction motors and would make them obsolete. Induction motors were labeled "old technology" that would soon be on the scrap heap of motor history. After industry papers were written and presentations were made on the impending demise of induction motors, today we see PMMs stand at less than 2% market share.