點擊圖片查看大圖FDNL-S0808I-MM
FDNL-S0808I-MM
MDV60A0022-5A3-4-00
直流無刷電機的控制原理，要讓電機轉(zhuǎn)動起來，首先控制部就必須根據(jù)hall-sensor感應(yīng)到的電機轉(zhuǎn)子所在位置，然后依照定子繞線決定開啟（或關(guān)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(jīng)電機線圈產(chǎn)生順向（或逆向）旋轉(zhuǎn)磁場，并與轉(zhuǎn)子的磁鐵相互作用，如此就能使電機順時/逆時轉(zhuǎn)動。當(dāng)電機轉(zhuǎn)子轉(zhuǎn)動到hall-sensor感應(yīng)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(huán)電機就可以依同一方向繼續(xù)轉(zhuǎn)動直到控制部決定要電機轉(zhuǎn)子停止則關(guān)閉功率晶體管（或只開下臂功率晶體管）；要電機轉(zhuǎn)子反向則功率晶體管開啟順序相反。
單片機中數(shù)字和模擬之間，因為數(shù)字信號是頻譜很寬的脈沖信號。
當(dāng)電機轉(zhuǎn)動起來，控制部會再根據(jù)驅(qū)動器設(shè)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(guān)導(dǎo)通，以及導(dǎo)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(zhuǎn)速快或慢的方式，如何產(chǎn)生這樣的PWM才是要達(dá)到較精準(zhǔn)速度控制的核心。
模擬電源的缺點：線圈、鐵芯本身是導(dǎo)體，那么它們在轉(zhuǎn)化電壓的過程中會由于自感電流而發(fā)熱（損耗。
福州卓凱電子科技有限公司
地址：福州市閩侯西江濱大道77號正榮潤園一號樓1205室
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