ABSTRACT
Even for higher speed applications, but for lower power, today’s power electronics allow for acceptable current waveforms up to 1-2.5 kHz fundamental frequency f1n.
Increasing the number of PM poles 2p1 in the PM generator to fulfill the standard condition,
f p n nn n n1 1= × ; ( )—speed rps (11.1)
thus becomes necessary. Then, the question arises as to whether the PM synchronous generators (SGs) with distributed wind-
ings are the only solution for such applications, when the lowest pole pitch for which such windings can be built is about τmin ≈ 30 mm, for three slots/pole. And, even at τ = 30-60 mm, is the slot aspect ratio large enough to allow for a high enough electrical loading to provide for high torque density? The apparent answer to this latter question is negative.
