Detecting Partial Demagnetization in AFPM Generators by Monitoring Speed and EMF Induced in a Supplemental Winding

In this article, a novel method to detect the partial demagnetization in air-cored permanent-magnet axial-flux generators is proposed. Its principle monitor speed-normalized fault detection signal. This signal depends only on severity, as it was extracted using flux-sensor with span that negates induced voltage under balanced conditions. The generator has been designed for marine renewable applications working variable speed conditions rending PM health monitoring nonstationary imperative. Initially, mathematical equation electromotive force derived aim extract frequency components related fault. To estimate an approach developed based magnetic flux monitoring, which penetrates throughout sensor. A 3-D finiteelement model of installed winding employed verify proposed steady and