FUZZY-LOGIC CONTROL-SYSTEM FOR THE EXCITATION OF A 3-PHASE SINGLE SHEET TESTER

The defined rotational magnetization of highly grain oriented SiFe she ets is complicated by the material's strong anisotropy. Especially cir cular magnetization is usually restricted to induction values of 1.2 T , even if advanced feed-back systems are applied. Specifically for ani sotropic materials, a 3-phase excited single sheet tester was develope d which offers 1.2 T magnetization without feed-back. For values up to 1.5 T, a digital control system is described which is based on fuzzy algorithms. It offers target approximations with procedure times close to 1 minute, the errors being restricted to some percent.