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改裝而來的。靈敏電流計即使靈敏度再高，通過的電流多不超過30微安，而學生用電流表測得的電流強度都是0.6A，或者3A，遠遠超出大值。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。電流表是與被測用電器串聯(lián)的，所以改裝時要分流。將靈敏電流計與一個阻值較小的電阻并聯(lián)，這樣就會使大部分電流通過電阻，小部分經(jīng)過表頭。這時將表頭標上新的刻度，就可以了。

學生用電流表有兩個量程，也就是有兩個電阻；指針式萬用表上的量程選擇實際是電位器。

3）當電動機屬頻繁起動、制動工作或處于重載起動且較頻繁工作時，可選取大一級的變頻器，以利用變頻器長期、安全地運行。

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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