1769-L33ER

雙極連接的方法如圖所示，采用電流在一個繞組中雙向流動的驅動方式（雙極驅動）。這種方式電機的結構比較簡單，端子數也較少，但由于控制一個端子的極性，因此驅動電路較為復雜。不過，這種電機的繞組利用率好，并且可以進行的控制，因此可以獲得很高的輸出轉矩。另外，還可以減小在線圈中產生的反電動勢，所以可以使用耐壓較低的電機驅動器。

■單極連接如圖所示，單極連接具有一個中心抽頭，采用電流在一個繞組中始終沿固定方向流動的驅動方式（單極驅動）。雖然步進電機的結構較為復雜，但是由于僅需要電流ON/OFF的控制，因此步進電機的驅動電路較簡單。不過，其繞組的利用率較差，與雙極連接相比只能獲得約一半的輸出轉矩。另外，由于電流ON/OFF時會在線圈中產生很高的反電動勢，所以需要使用高耐壓的電機驅動器。

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