140HLI34000 Quantum

兩種技術為位置反饋提供了解決方案。第一種也是常見的使用三個霍爾效應傳感器，嵌入在定子中并以相等的間隔排列，通常為 60° 或 120°。第二種“無傳感器”控制技術適用于需要少電氣連接的 BLDC 電機。

　　在配備傳感器的 BLDC 電機中，每個霍爾效應傳感器都與一個開關組合，該開關產(chǎn)生邏輯“高”（對于一個磁極）或“低”（對于相反磁極）信號。換向順序是通過組合來自霍爾效應傳感器和相關開關的邏輯信號來確定的。在任何時候，至少有一個傳感器被轉子的一個磁極觸發(fā)并產(chǎn)生電壓脈沖。

　　圖 3 顯示了逆時針驅動的三相 BLDC 電機的換向順序?；魻栃獋鞲衅靼惭b在位置“a”、“b”和“c”。對于換向序列中的每一步，MOSFET 橋將一個繞組（“U”、“V”或“W”）驅動為高電平，同時將一個繞組驅動為低電平，第三個保持懸空。例如，在圖的左上角，U 為高電平（形成 N 極），V 為低電平（S），W 為浮空。產(chǎn)生的磁場使轉子逆時針移動，因為它的永磁體被一個繞組排斥并被下一個繞組吸引。第二階段（下圖）顯示繞組 U 保持高電平，而 V 切換為浮動，W 切換為低電平，從而保持磁場的“旋轉”并隨之移動轉子。剩余的換向步驟，一個電循環(huán)，

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