A Synchronous Reluctance Machine (SynRM) uses reluctance concept and rotating sinusoidal mmf instead instead of wound field or permanant magnets. In a Synchronous reluctance machine, the excitation (field) winding is non-existant. Synchronous reluctance generators are commonly used in wind turbines.
I’m sorry that I can not explain the working principle of synchronous reluctance generators as I do not currently have an expert level knowledge about them. Hoping someone else will resolve your query soon.