Investigation on Magnetic Property Measurement Method of Solid Specimens Using an Electromagnet

For solid magnetic materials such as soft magnetic composite and structure steels, the electromagnet measurement method is used to measure the magnetic property of them. However, in this measurement, linear interpolation method of two hall effect sensors is used to obtain the magnetic field intensity and demagnetization field is considered to be generated because of gaps between the specimen and electromagnet. In this research, the validity of the linear interpolation estimation method and the influence of demagnetization field are investigated by using magnetic field analysis and by experiments. It is found that the linear interpolation estimation method is confirmed accurate enough but the demagnetization field needs to be corrected in both analysis and measurement.