Yeah it's not clear in the article but I reckon it is about minimizing torque ripple and perhaps other control issues. https://ieeexplore.ieee.org/document/5570

Yeah it's not clear in the article but I reckon it is about minimizing torque ripple and perhaps other control issues. https://ieeexplore.ieee.org/document/557001 https://ieeexplore.ieee.org/document/557001 https://www.controleng.com/articles/resurgence-for-sr-motors-drives/ https://www.controleng.com/articles/resurgence-for-sr-motors... https://ieeexplore.ieee.org/document/6808735 https://ieeexplore.ieee.org/document/6808735 https://en.m.wikipedia.org/wiki/Switched_reluctance_motor https://en.m.wikipedia.org/wiki/Switched_reluctance_motor As for "much" greater efficiency, I don't think so unless you are comparing to an induction motor running at very low load (efficiency drops off more than for SRM). I don't know how much of their time e.g. typical HVAC motors spend at such a low load in the real world.