Patent ID: 7391174
Filing Date: 2008-06-24
Classification: H02P

Abstract:
1. A brushless DC motor control apparatus controlling the number of revolutions of a brushless DC motor having a rotor with n poles (where n is a natural number) that perform an operation of rotating or stopping due to a supply current with m phases (where m is a natural number) supplied to a stator, comprising: a rotation detector part, which counts the number of revolution pulses from the brushless DC motor caused by the rotation of the rotor; a revolution requirement amount input part, which receives the number of revolutions of the brushless DC motor as input and converts it to a corresponding revolution requirement amount; a comparison part, which compares the number of revolution pulses and the revolution requirement amount; and a current controller part, which controls the supply current supplied to the brushless DC motor according to comparison results from the comparison part, wherein the supply current is classified into a first supply current and a second supply current, and wherein the brushless DC motor performs an operation of rotating at a constant speed when the first supply current is supplied and performs an operation of stopping when the second supply current is supplied and when the number of revolution pulses is equal to the revolution requirement amount.