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AN970
Using the PIC18F2431 for Sensorless BLDC Motor Control
Author: Padmaraja Yedamale Microchip Technology Inc. With a sensorless method of commutation, the Hall sensors, the sensor magnets, the sensor wires and the PC board can be eliminated. This simplifies the motor construction and reduces cost. Inherently, systems with fewer components are more reliable. Applications like the compressor control in a refrigerator or in HVAC systems, which generates heat and an elevated temperature, may accelerate Hall sensor failures. Using sensorless control improves the reliability of total system. There are two disadvantages to sensorless control: • The motor must be moving at a minimum rate to generate sufficient BEMF to be sensed.
AN970 Datasheet
