LEESON ELECTRIC調(diào)速器174311.00專業(yè)代理

指針式電流表都是由靈敏電流計(jì)改裝而來的。靈敏電流計(jì)即使靈敏度再高，通過的電流多不超過30微安，而學(xué)生用電流表測(cè)得的電流強(qiáng)度都是0.6A，或者3A，遠(yuǎn)遠(yuǎn)超出大值。電流表既要讓電路上的全部電流通過，又不允許通過線圈的電流超過安全限度。電流表是與被測(cè)用電器串聯(lián)的，所以改裝時(shí)要分流。將靈敏電流計(jì)與一個(gè)阻值較小的電阻并聯(lián)，這樣就會(huì)使大部分電流通過電阻，小部分經(jīng)過表頭。這時(shí)將表頭標(biāo)上新的刻度，就可以了。

學(xué)生用電流表有兩個(gè)量程，也就是有兩個(gè)電阻；指針式萬用表上的量程選擇實(shí)際是電位器。

3）當(dāng)電動(dòng)機(jī)屬頻繁起動(dòng)、制動(dòng)工作或處于重載起動(dòng)且較頻繁工作時(shí)，可選取大一級(jí)的變頻器，以利用變頻器長(zhǎng)期、安全地運(yùn)行。

Electric motors are the workhorse of the industry. Many applications exist where more than one motor can be used or the exact replacement is not available. LEESON makes every effort to maximize interchangeability, mechanically and electrically, where compromise does not interfere with reliability and safety standards. If you are not certain of a replacement condition, contact any LEESON Sales Office or LEESON Authorized Distributor.
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