點擊圖片查看大圖620-20 620-2030
620-20 620-2030
P2HZ-X19
是雙電容單相電動機接線盒上的接線圖，圖上清晰的反映了電動機主繞組、副繞組和電容的接線位置，你只需要按圖接進電源線，用連接片連接Z2和U2，UI和VI，電動機順轉(zhuǎn)，用連接片連接Z2和U1，U2和VI，電動機逆轉(zhuǎn)。單相電動機各個元件也好鑒別，電容都是裝在外面，用肉眼就可以看清楚接線位置（如上圖）啟動電容接在V2—Z1位置，運行電容接在V1—Z1間，從里面引出的線也好鑒別，接在（如上圖）UI—U2位置的是運行繞組，接在Z1—Z2位置的是啟動繞組、接在V1—V2位置的是離心開關(guān)。用萬用表也容易區(qū)分6根線，阻值大的是啟動繞組，阻值比較小的運行繞組，阻值為零的是離心開關(guān)。如果運行繞組和啟動繞組阻值一樣大，說明這兩個繞組是完全相同的，可以互為代用。單相電動機的繞組兩端和電容兩端不分極性，任意接都可以，但啟動繞組和運行繞組不能接反，啟動電容和運行電容不能接反，否則容易燒啟動繞組。
門極電路的正偏壓VGE負(fù)偏壓-VGE和門極電阻RG的大小，對IGBT的通態(tài)壓降、開關(guān)時間、開關(guān)損耗。
有不少電工對單相電機的接線搞不清。我先對單相電機的正反轉(zhuǎn)原理講一下。單機電機里面有二組線圈，一組是運轉(zhuǎn)線圈（主線圈），一組是啟動線圈（副線圈），大多的電機的啟動線圈并不是只啟動后就不用了，而是一直工作在電路中的。啟動線圈電阻比運轉(zhuǎn)線圈電阻大些，量下就知了。啟動的線圈串了電容器的。也就是串了電容器的啟動線圈與運轉(zhuǎn)線圈并聯(lián)，再接到220V電壓上，這就是電機的接法。當(dāng)這個串了電容器的啟動線圈與運轉(zhuǎn)線圈并聯(lián)時，并聯(lián)的二對接線頭的頭尾決定了正反轉(zhuǎn)的。比起三相電動機的順逆轉(zhuǎn)控制，單相電動機要困難得多，一是因為單相電動機有啟動電容、運行電容、離心開關(guān)等輔助裝置，結(jié)構(gòu)復(fù)雜；二是因為單相電動機運行繞組和啟動繞組不一樣，不能互為代用，增加了接線的難度，弄錯就可能燒毀電動機。
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