交流220V马达（电机）启动电容是多大？运转电容是多大？ 220V电机功率750w 启动电容和运行电容需要多大啊？
1.1KW\u53cc\u503c\u7535\u5bb9\u7535\u673a\u7684\u542f\u52a8\u548c\u8fd0\u884c\u7535\u5bb9\u5404\u662f\u591a\u5927?\u8fd0\u884c\u7535\u5bb9\u8ba1\u7b97\u503c\u662f78.8UF\uff0c\u5b9e\u9645\u9009\u752880UF\u7684\u7535\u5bb9\u3002
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\u5355\u76f8\u7535\u673a\u8fd0\u884c\u7535\u5bb9\u7684\u8ba1\u7b97\u516c\u5f0f\uff1aC=1950I/Ucos\u222e\uff08\u5fae\u6cd5\uff09 \u516c\u5f0f\u4e2d\uff1a
I\uff1a\u7535\u673a\u7535\u6d41\uff0c U\uff1a\u7535\u6e90\u7535\u538b\uff1b cos\u222e:\u529f\u7387\u56e0\u6570\uff08\u5355\u76f8\u7535\u673a\u53d60.75\uff09 \uff0c1950\uff1a\u5e38\u6570
\u8d77\u52a8\u7535\u5bb9\u4e00\u822c\u6309\u8fd0\u884c\u7535\u5bb9\u5bb9\u91cf\u76841-4\u500d\u8ba1\u7b97\u3002
\u8ba1\u7b97\uff1a
\u7531\u5355\u76f8\u7535\u673a\u7684\u529f\u7387\u516c\u5f0f\uff1aP=UIcos\u222e \u53ef\u5f97
I=P/Ucos\u222e
\u6240\u4ee5\u989d\u5b9a\u7535\u6d41I=1100/(220*0.75)=6.67A \uff08\u56e0\u4e3a\u6ca1\u6709\u8bf4\u660e\u7535\u538b\uff0c\u6309\u5e02\u538b\u8ba1\u7b97\uff09
\u4ee3\u5165\u8fd0\u884c\u7535\u5bb9\u7684\u516c\u5f0f\u4e2d
C=1950*6.67/(220*0.75)=78.8\u03bcF
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\u6269\u5c55\u8d44\u6599\uff1a
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\u53c2\u8003\u8d44\u6599\uff1a\u767e\u5ea6\u767e\u79d1-\u529f\u7387
运行电容容量取值方法 ：
1、公式法：运行电容容量 C=120000 * I / 2.4*f*U*cosφ
式中：I为电流；f为频率；U为电压；cosφ为功率因数取0.5～0.7。
2、经验公式：实际应用中小型单相电机电容容量取值为电机瓦数*0.06微法。
3、经验数据：如果电机不超过200W,启动电容不会超过100uF,如果运转电容,可以选择几个数值通电试验,看哪一个电容的容量下整机电流最小,则该电容的容量就是最佳数值.
运转无需电容，启动电容看你的电机功率啊，和绕线神马的有关系的。
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