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I thought synchronous reluctance machines hadn't really made it out of the research lab. In this case we were discussing switched reluctance (doubly salient) motors but still this is interesting as ABB must think there is something well worth pursuing to have brought out a synchronous (singly salient) product.New regulations are demanding higher efficiency for applications such as pump and fan drives. To achieve this, PM motors have been used for a few years now. The downside of those being the expensive magnets of course. The efficiency of the synchronous reluctance motor is not as good as the PM, but although it isn't more expensive than the induction motor, it still has higher efficiency.
Our customers are very interested in this technology, but so far there aren't that many manufactures producing the motors. I think this could change soon though.
As you have mentioned, the big advantage of the synchronous reluctance over the switched reluctance is, that it can be driven by a standard 3 phase inverter. To be honest, I am not really sure why people are using switched reluctance rather than synchronous reluctance at all.