电机额定功率和额定电流计算公式
电流是电荷的定向移动，单位为安培（A）。
欧姆定律
$I = \frac{U}{R}$文章源自公式库网-https://www.gongshiku.com/html/201808/dianjiedinggongshuaiheedingdianliujisuangongshi.html
功率求电流
单相：$I = \frac{P}{U\cos\varphi}$文章源自公式库网-https://www.gongshiku.com/html/201808/dianjiedinggongshuaiheedingdianliujisuangongshi.html
三相：$I = \frac{P}{\sqrt{3}U\cos\varphi}$文章源自公式库网-https://www.gongshiku.com/html/201808/dianjiedinggongshuaiheedingdianliujisuangongshi.html
电动机额定电流
$I = \frac{P}{\sqrt{3}U\cos\varphi\eta}$文章源自公式库网-https://www.gongshiku.com/html/201808/dianjiedinggongshuaiheedingdianliujisuangongshi.html
$\eta$ — 效率，$\sqrt{3} ≈ 1.732$。文章源自公式库网-https://www.gongshiku.com/html/201808/dianjiedinggongshuaiheedingdianliujisuangongshi.html
文章源自公式库网-https://www.gongshiku.com/html/201808/dianjiedinggongshuaiheedingdianliujisuangongshi.html
⚡ 三相多出 $\sqrt{3}$ 因子。文章源自公式库网-https://www.gongshiku.com/html/201808/dianjiedinggongshuaiheedingdianliujisuangongshi.html 文章源自公式库网-https://www.gongshiku.com/html/201808/dianjiedinggongshuaiheedingdianliujisuangongshi.html文章源自公式库网-https://www.gongshiku.com/html/201808/dianjiedinggongshuaiheedingdianliujisuangongshi.html
