MPS-B4540F-SJ52DA旋轉(zhuǎn)磁場的轉(zhuǎn)速在電動機(jī)實際運(yùn)行過程中只與磁極對數(shù)有關(guān)，我國規(guī)定標(biāo)準(zhǔn)電源頻率為f=50周/秒，所以磁極對數(shù)多，旋轉(zhuǎn)磁場的轉(zhuǎn)數(shù)成就低。一般情況下，由于轉(zhuǎn)差率的存在，電機(jī)實際轉(zhuǎn)速略低于旋轉(zhuǎn)磁場的轉(zhuǎn)速，旋轉(zhuǎn)磁場的轉(zhuǎn)速n=3000。

變頻電機(jī)轉(zhuǎn)速與頻率的關(guān)系

電機(jī)的旋轉(zhuǎn)速度同頻率成比例，電機(jī)頻率越高，風(fēng)扇的轉(zhuǎn)速也會隨著降低，因此改變頻率和電壓是優(yōu)的電機(jī)控制方法 。電機(jī)旋轉(zhuǎn)磁場的極對數(shù)在光學(xué)與無線電技術(shù)中也常使用，電機(jī)轉(zhuǎn)速與頻率的公式為n=60f/p，可以直接用工頻電源驅(qū)動。

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