吴家堡镇56步进电机SM57HT41-3006MA胶印机
如何检查直流电机定子磁极极性?
答:⑴ 对于并励绕组、他励绕组、串励直流电机的串励绕组、复励直流电机中的复励绕组的极性检查,可将各磁极串联起来,然后通过直流电源,用指南针在极靴中间测其极性,反复几次,由指南针指南或指北来确定磁极的极性。差复励直流电机的串级励绕组极性与并励绕组极性相反,而积复励直流电机则相同。在检查某种绕组极性时,其他各绕组应断开接线,否则也影响测试准确度。通入电压的高低应使直流电流的大小保证磁极的磁场有足够吸引指南针的能力。
⑵ 换向极的极性、主极极性电枢旋转方向应符合下面关系,直流电机:主极N→换向极n→主极S;直流发电机:主极N→换向极s →主极S→换向极n。测试检查换向极的极性时,方法同测试主极一样,应把主极和补偿绕组断开,以防测量不准。对于少匝大截面的换向绕组通入的电流应大一些(不超过额定值)。对于奇数换向极可设想与不缺极的偶数及时进行相同测试检查。
⑶ 检查补偿绕组的极性与检查换向极极性方法相同。要把换向极和主极绕组断开,由于补偿绕组是嵌入在主极极靴内,所以测试补偿绕组极性时应在换向磁铁上表示出来。
吴家堡镇56步进电机SM57HT41-3006MA胶印机
自锁型铠装电缆:ACWU9是一种高柔韧性的自锁型铝铠装、PVC外护套、9℃交联聚防水型绝缘单芯或多芯电缆,附一根等电位联结裸导线。因为具有FT4级的PVC外护套,ACWU9可直接坦、埋地敷设,并适用于腐蚀环境和非燃性建筑中。ACWU9减少了管道布线所带来的施工难度和人力成本。合金电缆已在工厂用高柔韧性的自锁型铠装和密封PVC外护套组装完毕,不需要管道及其附件和人工密集的拉线、扣纹和穿管等工序。
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吴家堡镇56步进电机SM57HT41-3006MA胶印机
吴家堡镇56步进电机SM57HT41-3006MA胶印机
在首届涂料行业高层论坛召开之际,《涂料行业十一五科技创新发展纲要》、《涂料行业准则》相继发布,为处于战略转型期的涂料行业指明了发展方向与思路。但笔者也了解到,尽管211年我国涂料行业继续保持快速发展,产量有望再创历史新高,为十一五开了好头,但行业发展中依然存在很多问题,发展任重道远。本届论坛上对行业如何发展也做了深入探讨,笔者总结有如下四点:首先,行业经营、管理方式应立足全局化、集团化的战略高度。
吴家堡镇56步进电机SM57HT41-3006MA胶印机
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