3 ms·
PM rotor generators have several disadvantages: they're heavy; magnetic flux fades in time, moreso under heat; inability to control the rotor's magnetic flux; p
by petre 8y ago
PM rotor generators have several disadvantages: they're heavy; magnetic flux fades in time, moreso under heat; inability to control the rotor's magnetic flux; probably expensive as well.
- rurban 8y agoMostly true, just not the price. A simple stator generator is about half the price of a PMM, and at least half the value.
- strainer 8y agoIn table 3* the study summarizes 4 categories of generator. Low speed Permanent Magnet PMSG Low speed Excited Synchronous EESG Mid to High speed Geared PM PMSG High speed Geared Induction DFIG All these types are currently competitive in large wind turbine installations, with high PM content designs getting selected in quite a minority of cases, despite modest efficiency and maintenance bonuses, even at the current top end of generator scale ~8MW. To get beyond 10MW generators advantages of PM are desired but are also lumbered by relative heaviness besides the price of rare earths. Superconducting Magnets do seem like the way upward then, if reliable 'super-cooling' can be achieved. [*] https://www.sciencedirect.com/science/article/pii/S0301420717300077#t0015 https://www.sciencedirect.com/science/article/pii/S030142071...