點擊圖片查看大圖6DS1326-8BB
6DS1326-8BB
TRA 8A-SH
直流無刷電機的控制原理，要讓電機轉動起來，首先控制部就必須根據hall-sensor感應到的電機轉子所在位置，然后依照定子繞線決定開啟（或關閉）換流器（inverter）中功率晶體管的順序，inverter中之AH、BH、CH（這些稱為上臂功率晶體管）及AL、BL、CL（這些稱為下臂功率晶體管），使電流依序流經電機線圈產生順向（或逆向）旋轉磁場，并與轉子的磁鐵相互作用，如此就能使電機順時/逆時轉動。當電機轉子轉動到hall-sensor感應出另一組信號的位置時，控制部又再開啟下一組功率晶體管，如此循環電機就可以依同一方向繼續轉動直到控制部決定要電機轉子停止則關閉功率晶體管（或只開下臂功率晶體管）；要電機轉子反向則功率晶體管開啟順序相反。
這個變化的磁場通過鐵芯傳遞到副線圈，在副線圈里就產生了感應電壓，于是變壓器就實現了電壓的轉變。
當電機轉動起來，控制部會再根據驅動器設定的速度及加/減速率所組成的命令（Command）與hall-sensor信號變化的速度加以比對（或由軟件運算）再來決定由下一組（AH、BL或AH、CL或BH、CL或……）開關導通，以及導通時間長短。速度不夠則開長，速度過頭則減短，此部份工作就由PWM來完成。PWM是決定電機轉速快或慢的方式，如何產生這樣的PWM才是要達到較精準速度控制的核心。
這個變化的磁場通過鐵芯傳遞到副線圈，在副線圈里就產生了感應電壓，于是變壓器就實現了電壓的轉變。
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