Comparison of Matrix-Rotor Induction Motor and Permanent Magnet Machine for Low-Speed High-Torque Applications

In recent years, rare-earth free machines have gained increased attention in low-speed high-torque (LSHT) applications considering rare-earth scarcity and price fluctuations. In this sense, matrix-rotor induction machines (MRIM) have shown promising results, but their suitability and competitivity when compared with the prominent permanent magnet synchronous machines (PMSM) have not been disclosed so far. This paper provides an electromagnetic analysis of MRIMs by means of 3D finite element simulations, comparing their performance to a PMSM in LSHT applications. Rated torque, efficiency and power factor of these machines are assessed and compared.