CONTROL SYSTEM AND METHOD FOR REDUCING A COMMUTATION TORQUE RIPPLE OF A BRUSHLESS DC MOTOR

摘要

PURPOSE: A BLDC(Brushless DC) motor driving system for reducing a communication torque ripple and a method for the same are provided to reduce the communication torque ripple in a commutation block by using a single DC sensor to vary a duty ratio according to a variation of speed of the BLDC motor. CONSTITUTION: A BLDC motor driving system for reducing a communication torque ripple includes a switching portion, a position detection portion, and a control portion(500). The switching portion includes a plurality of switches to switch the current applied to a plurality of coils of an armature of a BLDC motor. The position detection portion detects a position of a rotator of the BLDC motor. The control portion(500) controls the switches of the switching portion to rotate the BLDC motor on the basis of an output of the position detection portion. The control portion(500) reduces a torque ripple of the BLDC motor by controlling the switching portion according to the rotating speed of the BLDC motor in a commutation block.