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Remagraph® C 500 for computer controlled measurement of the hysteresis curves of soft magnetic materials - 11843 REMAGRAPH

®

C - 500

for computer controlled measurementof the hysteresis curvesof soft magnetic materials

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Introduction

The REMAGRAPH
® C is a fully automatic, computer controlled station to measure the (quasi-)static hysteresis curves (DC) of soft magnetic materials. The measurements can be carried out on bars, strips and rings. Bars or strips are clamped together with a measuring coil system between the poles of a double C yoke. The coils are connected to two electronic fluxmeters. The magnetic polarization J = B - µ
· H is measured in dependence of the inner field strength H (initial magnetization curve and hysteresis loop).Fixed measuring coils are used for various cross sections. Here the air flux between the sample and the coil is compensated in regard to the field strength H . Thus the coils do not have to fit tightly to the surface of the samples and can be used for different cross section shapes. The flux density B is calculated from the polarization so that both J ( H ) and B ( H ) curves can be represented. The field strength H is determined by a potential coil fitting tightly to the surface of the sample. Ring shaped samples are provided with a primary and a secondary winding. The field strength H is calculated from the current in the primary winding. The secondary winding is connected to a fluxmeter to measure the flux density B . The measuring speed is controlled in a way that the time change of the flux density B remains almost constant. That is why the steep sections of the measuring curve are passed through slowly and the flat ones faster. Thus measuring faults caused by eddy current influences are avoided and the measuring duration is still kept short. So hysteresis losses can be determined independently from eddy current losses. Special features of the REMAGRAPH
® C: • Automatic measurement of the static hysteresis curves of soft magnetic materials • Measurements on bar, strips or ring samples • The field strength is measured with a potential coil adjacent to the sample