They are not as good as permanent magnet motors except on price/material availability. See this article: http://electronicdesign.com/article/analog-and-mixed-s

They are not as good as permanent magnet motors except on price/material availability. See this article: http://electronicdesign.com/article/analog-and-mixed-signal/induction-motors-pm-synchronous-motors-operate-74650 http://electronicdesign.com/article/analog-and-mixed-signal/...