CX1900-0025

CX1900-0025

主要根據(jù)電刷的工作條件是否滿足電流密度（A/cm2）和集電環(huán)園周邊緣的線速度（m/s）來確定。確定公式：①電刷載流量（A）=電刷電流密度（A/cm2）×電刷寬度L（cm）×電刷厚度b（cm）≥電機轉(zhuǎn)子額定電流（A）；②集電環(huán)園周邊緣的線速度（m/s）=電動機額定轉(zhuǎn)速（r/m）/60（s）×集電環(huán)周長（m）≤電刷適用的規(guī)定范圍（m/s）。 其常用電刷有不墨電刷、電化石墨電刷和金屬石墨電刷三種。使用中應注意經(jīng)常檢查電刷活動情況、電刷壓力和磨損程度。電刷在刷握中要能上下自由活動，無卡阻?？ㄋr把電刷兩側(cè)面在砂布上磨平即可。電刷的壓力要根據(jù)電刷的品種和型號進行合適的調(diào)整。目前附在刷握上的電刷壓緊彈簧多屬拉伸壓縮彈簧，其壓力隨著電刷的磨損逐漸減小，故在電機運行過程中，其電刷壓力應隨時調(diào)整。

　　變壓器SFZ-32000/220TH中，Z和TH是什么意思？

　　根據(jù)JB3837，規(guī)定，Z是有載調(diào)壓的意思，TH表示在濕熱帶地區(qū)使用。

　　請教60HZ的電機放在50HZ的電源上用，需要注意什么？ 這是由于電機的電流頻率低于設計頻率，要使其轉(zhuǎn)動中產(chǎn)生的空載反電動勢減小、空載電流增大，對電機造成損壞，因此就要求其空載電壓降低了。 在變頻調(diào)速技術中，電動機的頻率和定子電壓是同時改變的。即是頻率下降，電壓也要同時下降，電動機才不會過流，才會得到理想的運行效果。

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