The present invention provides a permanent-magnet-synchronous-motor having a stator with concentrated windings with the following structure so that permanent magnet (6) is hard to subjected to demagnetization magnetic field: 0.3 Lg<La≦2.0 Lg, where La is a clearance between teeth of stator (1), and...http://www.google.ca/patents/US7408279?utm_source=gb-gplus-sharePatent US7408279 - Permanent magnet synchronous motor including permanent magnet with tapered outer edges
