Permanent magnet machines including doubly salient machines having one or more permanent magnets located at least partly and preferably entirely within the stator teeth, thereby avoiding weakening of the stator structure while reducing acoustic noise. The magnets may be located in only a subset of the...http://www.google.ca/patents/US6724114?utm_source=gb-gplus-sharePatent US6724114 - Doubly salient machine with angled permanent magnets in stator teeth
