Three-Voltage Method Based on Elastic Permeability Measurement
Dong Wei · Physics Examination and Testing · 2013
Because of large sample,high accuracy for instrument and many error factors,the measurement of elastic permeability by bridge method has been eliminated gradually in many companies.In this study,through improving traditional principle of inductance measurement based on voltage method,and combining with series equivalent circuit model of soft magnetic material ring sample,the elastic magnetic conductivity measurement was carried out intead of the three voltage RMS measurement.The cause of the poor stability and low accuracy of elastic permeability measurement were analysed based on three-voltage method,and the parameters were selected through experiment.Finally,a 1J50 soft magnetic material standard sample was tested,and the results showed the error excels 5%,which can meet the requirements of GB.The measuring method is simple,and automatic measurement is easy to be realized.