A drive control device of motor capable of starting up even a motor of such a type that the polarity of induced voltage does not switch every 180° of electrical angle or the polarity, positive or negative, does not occur with accuracy without causing a reverse rotation is provided. In a start-up control...http://www.google.ca/patents/US7411365?utm_source=gb-gplus-sharePatent US7411365 - Drive control device of motor and a method of start-up
