介紹了無刷直流電機無位置傳感器轉子位置檢測的一種新方法。該方法利用非導通相反電勢邏輯電平經邏輯處理后得到一脈沖列, 采用PLL 鎖相技術將脈沖列倍頻, 通過倍頻電路計數器的計數值可以精確檢測轉子位置。利用數字比較技術將計數值與鎖存器中的預置數值比較, 可以精確控制繞組電流的最佳換向時刻。通過調節鎖存器中的預置值可以方便地調節換向角, 非常適用于無刷直流電機的各種控制算法。同時該方法克服了外同步起
動過程中易產生的振蕩和失步現象。通過實驗證明該方法是正確的、有效的。
關鍵詞: 無刷電機; 無位置傳感器; 檢測
Abstract: Th is paper describes a novel method of detect ing fo r ro to r flux po sit ion of the brush less DC mo to r (BLDCM ). Th is method, a pulse line is acquired from elect romagnet ic fo rce signals in the mo to r w indings that carry no current. U sing PLL techno logy mult ip les the pulse. Thye numerical value of counter in mult ip le - frequency circuit co rrelates to the po sit ion of ro to r flux. Comparing the figure of counter w ith that w h ich is p resto red in flip - latch, the best commutat ion t ime can be accurately determ ined. The commutat ion angle can be flexibly adjusted by varying the p resto red figure in flip - latch. Th is is very fit fo r mult ifarious arithmet ic of BLDCM. The hunt ing and out- of - step are conquered in the p rocess of start. Experimental results confirm the co rrectness and effect iveness of th ismethod.
Key words: brush lessmo to r; senso rless; detect ion