Patent ID: 7161325
Filing Date: 2007-01-09
Classification: H02P

Abstract:
1. A lead-angle control method in a motor control system, the method comprising: calculating and outputting an instruction current to compensate a difference between an instruction speed and a current speed by a speed controller; generating and outputting a rotating-coordinate-system instruction current component based on the instruction current by an instruction current generator; generating and outputting a stationary-coordinate-system instruction voltage component based on the rotating-coordinate-system instruction current component by an instruction voltage generator; calculating and outputting switching times applied to each switching element of an inverter based on the stationary-coordinate-system instruction voltage component by a space voltage vector controller; calculating and outputting a lead-angle compensation value by comparing the sum of effective vector application times outputted from the space voltage vector controller with a sampling period by a lead-angle compensator; and compensating a lead-angle component by adding the lead-angle component to the lead-angle compensation value.