整體系統架構以數位訊號控制器為主要核心，結合智慧型功率模組驅動電路與換相訊號估測電路為基礎，以實現無位置感測器的無刷直流馬達驅動系統，達到電路簡化及降低驅動系統之開發成本，並以實驗結果驗證其可行性。 ;Via the relationship between line-to-line voltage and zero crossing points of back electromotive force, the thesis is aimed at designing Hall signal estimation circuit and replacing the original Hall effect sensors to provide the information of the rotor position and rotor speed. Besides, there is no signal of back electromotive force in open-loop start-up in motors, the thesis then additionally join a start-up strategy, which uses the stationary start-up method and combines a stationary current, then drive the rotor by means of six-step square wave starting until the back EMF is enough to estimate an accurate signal, and change to closed-loop control system, in order to intensify the robustness and avoids over-current problems during open-loop start-up.
A digital signal processor, which combines intelligent power module and Hall signal estimation circuit as a foundation, is the main nucleus in the whole systematic structure. As the experimental results, this study implement a senseless brushless dc motor drive can achieve both circuit simplification and reduction of developing cost of the system.
