A brushless direct current motor includes a permanent magnet rotor and a set of stator windings. The motor further includes a circuit for changeably connecting the set of stator windings to operate in a first electrical configuration or a second electrical configuration. In the second...http://www.google.fr/patents/US5821660?utm_source=gb-gplus-shareBrevet US5821660 - Brushless direct current motor having adjustable motor characteristics
Brushless direct current motor having adjustable motor characteristics
