本文針對電力機車牽引電機主極斷路故障，闡述了檢測電機主極裂紋的原理及具體電路設計方案，提出了主極裂紋檢測過程中克服提離效應的方法和提高測量精度的措施。當主極有裂紋缺陷時，通過探測線圈的磁通量就會發生變化，根據渦流大小及分布情況可檢測出影響線圈電特性的參數，從而發現牽引電機主極裂紋故障。由本方案設計的牽引電機主極裂紋渦流檢測裝置具有頻率可調，測量結果穩定且精度高等優點。
關鍵詞：牽引電機；電機主極；裂紋；渦流檢測；提離效應
Abstract: This thesis expatiates the theory and design of eddy current testing the electrode flaw of traction motor aiming at electrode fault of traction motor. And it describes how to overcome the influence of the lift-off and improve measure precision in eddy current testing process. The magnetic flux changes in the detector winding if electrodes of motor has flaws. It can give signals about the flaws by the quantity and distribution of eddy current. The designed device of eddy current testing of electrode fault of traction motor have good
qualities such as frequency modulation characteristic and steady measure result and supernal precision.
Keywords: traction engine; electrodes of motor; flaw; eddy current testing; effect of the lift-off