Patent ID: 8829835
Filing Date: 2014-09-09
Classification: H02P

Abstract:
1. A controller of a motor comprising: a driving signal output module configured to generate a driving signal for generating a driving current of a motor, a duty ratio of the driving signal is dependent on an over current detection signal; a position detector configured to generate a position detection signal for determining an operating status of the motor by comparing an induction voltage generated by a rotation of a rotor of the motor in response to the driving current with a predetermined reference voltage; a determiner configured to determine, based on the position detection signal, whether the motor is in a starting state in which a rotating frequency of the rotor is smaller than a predetermined value or in a steady state in which the rotating frequency of the rotor is equal to or higher than the predetermined value; and an over current detector configured to output a comparison result as the over current detection signal by comparing a first over current detection voltage with a voltage corresponding to the driving current of the motor when the motor is in the starting state, and by comparing a second over current detection voltage that is different from the first over current detection voltage with the voltage corresponding to the driving current of the motor when the motor is in the steady state, in accordance with a determination result of the determiner.