Demagnetization Testing for a Mixed-Grade Dovetail Permanent-Magnet Machine

Study of an Altered Magnetic Circuit of a Permanent Magnet Linear Generator for Wave Power

“…Several of these studies have discussed magnetic circuits with rare earth magnets [34][35][36]38,39], whereas others included ferrites [32,33] or a mixture of ferrites and rare earth metals [37]. Most reviewed research on mixed magnet grade involved rotating machines [32][33][34][35][37][38][39]; however, a linear PM motor was studied in [36].…”

“…Previous studies have suggested that a mixed magnet grade design can be used for electrical machines [32][33][34][35][36][37][38][39]. Several of these studies have discussed magnetic circuits with rare earth magnets [34][35][36]38,39], whereas others included ferrites [32,33] or a mixture of ferrites and rare earth metals [37].…”

“…Several of these studies have discussed magnetic circuits with rare earth magnets [34][35][36]38,39], whereas others included ferrites [32,33] or a mixture of ferrites and rare earth metals [37]. Most reviewed research on mixed magnet grade involved rotating machines [32][33][34][35][37][38][39]; however, a linear PM motor was studied in [36]. The focus of these publications were generally of the torque-or total harmonic distortion (THD) measurements of the system [36][37][38][39] or its demagnetization behavior [32][33][34][35].…”

“…Most reviewed research on mixed magnet grade involved rotating machines [32][33][34][35][37][38][39]; however, a linear PM motor was studied in [36]. The focus of these publications were generally of the torque-or total harmonic distortion (THD) measurements of the system [36][37][38][39] or its demagnetization behavior [32][33][34][35]. A number of studies have investigated linear machines with magnetization in the direction of motion [40][41][42][43][44].…”

Partial Irreversible Demagnetization Assessment of Flux-Switching Permanent Magnet Machine Using Ferrite Permanent Magnet Material

“…Previous research mainly focused on the demagnetization behaviors of surface permanent magnet machines and the interior permanent magnet (IPM) machines [17], [18], particularly under faulty conditions [19], [20]. The demagnetization analysis of some other types of permanent magnet machines also exists in the literature, such as tubular permanent magnet machine [21], ferrite-assisted synchronous reluctance machine [22], dovetail permanent magnet machine [23], and flux-reversal permanent magnet machine [24]. However, the irreversible demagnetization characteristics of FSPM machines are merely studied.…”