6GK7242-5DX30-0XE0

電機通過將轉子磁極數從4個增加到10個，將霍爾效應IC信號頻率提高了2.5倍。這使得低速運行時的反饋信號平滑，減少了電機中的紋波速度。

由于無刷電機使用傳感器來檢測磁極，因此它們不適合低速運行。但是，隨著磁分析技術、軟件信號處理技術和驅動技術的改進，低運行速度已從4極電機的300轉/分降低到80轉/分。 此外，即使在低速度下輸出扭矩也恒定，因此可以在較寬的速度范圍內實現平穩的旋轉控制。

5.2 寬 速度控制范圍(高速 運行)

霍爾效應IC信號波形和電機電流波形如圖5.5所示。

與 500 RPM 相比，關于霍爾效應 IC 信號，在 1000 RPM 時可以觀察到電流波形滯后和電機電流增加。

對無刷電機進行驅動時，根據霍爾效應 IC 信號和勵磁模式向繞組施加電壓。但是，如果轉速增加，則由于電機電感，電流相位會出現滯后。 電流相位中出現的滯后對電機中產生的扭矩產生無效電磁力，從而降低有效電磁力。由于電機執行控制以保持轉速，因此電流增加并產生必要的扭矩。此外，如果速度增加，相位滯后增加，旋轉停止。

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