變頻器 常用的計算轉速公式，RPM=120*f/極數，為什麼常數是120

iabox

同步轉速 = 磁場旋轉頻率 × 時間轉換係數


(1) 單極對的旋轉頻率
每個磁場周期，單極對的旋轉頻率為：
頻率對應的旋轉次數 = 𝑓/極對數


其中：
極對數=極數/2




(2) 每分鐘的旋轉數
為了將轉速從「每秒」轉換為「每分鐘」，我們將其乘以 60：


RPM=(𝑓/極對數)×60




(3) 將公式整理
將 極對數=極數/2


極對數=極數/2 代入公式：


RPM=>(𝑓/極數/2)×60=>(2x𝑓/極數)×60


最後化簡為：


RPM=120x𝑓/極數






知道底層的原理，背起來，比較不容易忘!

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