22-COMM-P

22-COMM-P

線圈切換頻率的增加反過來又會提高速度。但是，如果沒有相應的電能增加，施加的扭矩就會下降。伏特/赫茲控制提供了一種簡單的解決方法，即隨著頻率的上升而增加線路電壓，使轉矩可以保持在恒定水平。不幸的是，這種關系在低速時并不是特別一致。需要更高的電壓才能在低速時保持高扭矩，但效率會下降并增加線圈飽和和過熱的可能性。

磁場定向控制提供了一種優化電機控制的方法，特別是在低速時，并且還提供了使電機定位控制更加的能力。這增加了交流電機的整體應用范圍，有助于降低工業機械的成本和運營成本。

在磁場定向或磁通矢量控制中，伏特/赫茲控制所暗示的速度和扭矩之間的聯系被打破。磁場定向控制的概念可以用繞線直流電機的模型來表達，其中提供給定子和轉子的電流是獨立的。在該模型中，可以獨立控制產生的扭矩和磁通量。由電流產生的電機組內部的磁場強度決定了磁通量。提供給轉子電磁繞組的電流控制扭矩 - 當磁場試圖將自身對齊到穩定狀態時。

直流電機使用轉子上的換向器，該換向器執行控制定子上的哪些線圈在任何時候通電的工作。換向器的設計使得電流切換到機械對齊的繞組，以在該點產生大扭矩。因此，繞組的管理方式使磁通發生變化，以保持轉子繞組與定子中產生的磁場正交。

在交流電機中，只有定子電流受到直接控制。轉子通常使用永磁體來提供其磁場。這意味著磁通和扭矩依賴于相同的電流。但是磁場定向控制提供了幾乎獨立操作它們的能力。在實踐中，定子磁通是動態控制的，以提供獨立操縱扭矩的能力。通常，可以驅動定子線圈，以便它們產生扭矩或沿定子軸線施加力，這種模式不會影響旋轉。這些方向分別是正交軸和直軸。為了傳遞運動，每個線圈依次被驅動以產生高正交力。

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