Effect of Ball Scribing on Magnetic Barkhausen Noise of Grain-oriented Electrical Steel

Hao Wang^1,2，Changsheng Li¹，Tao Zhu¹，Ban Cai¹，Gang Huo^1,3，Nasir Mohamed²

1. State Key Laboratory of Rolling and Automation,Northeastern University2. Wolfson Centre for Magnetics,Cardiff University,Cardiff CF24 3AA,UK

摘 要：<正>Effect of ball scribing on magnetic Barkhausen noise（MBN） of conventional grain-oriented（CGO） and highpermeability grain-oriented（HGO） electrical steel was investigated.The results showed that after ball scribing, root mean square of MBN（MBNrms） of CGO electrical steel increased 9.8%with 4 mm scribing spacing at 1.2 T,and that of HGO electrical steel apparently decreased 17.3%with 16 mm scribing spacing at 1.2 T. Through the formation and development of free magnetic poles and secondary magnetic domains due to compressive stress,primary magnetic domain space of grain-oriented electrical steel becomes smaller,which reflects as a variation of MBN in the macroscopic magnetic properties.Through correlation formula derivation of MBNrms and equilibrium distance between domain walls,effect of domain refinement on grain-oriented electrical steel was also interpreted,and optimum equilibrium distance between domain walls was determined.

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