Patent ID: 9184680
Filing Date: 2015-11-10
Classification: H02P

Abstract:
1. A method of operating a motor drive control device configured to drive a multiphase DC motor the method including the steps of: (a) detecting a motor drive current flowing to the multiphase DC motor; (b) converting the motor drive current to a current detection digital signal supplying PWM drive output signals to an output pre-driver of the motor drive control device in such a manner as to minimize an error between a current instruction signal and the current detection digital signal; (c) detecting an induced voltage of a stator coil of each phase of the multiphase DC motor; (d) supplying a plurality of initial acceleration output signals specifying a conducting phase for initial acceleration of the multiphase DC motor to an output drive controllers of the motor drive control device; (e) conducting an initial acceleration of the multiphase DC motor, wherein upper-limit duty values of the PWM drive output signals during a period of the initial acceleration can be arbitrarily set.