起重電磁鐵的磁極

起重電磁鐵的磁極麵，容易造成磨損而高低不平
，若磨損到焊縫處，輕者使潮氣滲入，損壞絕緣

、縮短壽命；zhongzheshixianquanbaohuyongdehubantuoluo
，zuihousunhuaixianquanershiqizhongdiancitiebaofei。dangfaxianzheyangdemosunxianxiang，zaoqiguzhangkeyongduihanfangfazaijiagonghouzaimoping
，dangmosunliangguodashi
，yingjiangbupingdejimianjingjijiagonghou，zaianyuanjimiandaxiaodegangbanbuhanhemopingsunhuaihanfengchudeaotumian。