Hardware Implementation of Field-Weakening BLDC Motor Control

摘要

This paper presents a new approach of sensored BLDC (Brushless DC) motor driving in the field weakening (also called phase advanced drive) region, in order to extend the maximum speed of the BLDC motor. The basic concept is the usage of a special position sensor ASIC (Application Specific Integrated Circuit) for which the zero rotor position offset is programmable. Whit this technique the position sensor itself generates phase-advanced rotor position signals to the BLDC motor controller, Therefore the computational power needed to calculate the timing of the phase-advanced commutation points can be significantly reduced, to a simple position angle advance command to the position sensor.