From the perspective of the development process of brushless DC motor controllers, from the early controllers using small-scale analog and digital circuits and discrete components → controllers using integrated control circuits for brushless DC motors → single-chip microcomputers → digital-based controllers in recent years The controller of the signal processor. From the perspective of the control system, it can be divided into: analog control system, analog and digital hybrid control system, and all-digital control system. These controllers of different levels and development stages adapt to different cost-effective requirements, and gradually push the brushless DC motor control to a higher level.

　　This article is taken from ------"Permanent Magnet Brushless DC Motor Technology"