A motor assembly includes a brushless dc motor and a driving unit. The driving unit includes three first power transistors, each being activable to connect a respective one of three windings of a coil unit of the dc motor and a power supplying circuit. A comparing unit compares a reference voltage signal...http://www.google.fr/patents/US5577152?utm_source=gb-gplus-shareBrevet US5577152 - Motor assembly
