A Non-Destructive Methodology for Estimating the Magnetic Material Properties of an Asynchronous Motor

In this paper, the magnetic material characteristics, the normal magnetizing B - H curve and the loss parameters, are reconstructed for an asynchronous motor. The identification process is carried out using a coupled experimental-numerical inverse technique. Different inverse problems are formulated based on global and local magnetic measurements at no load condition. It is shown that a higher accuracy of identifying the normal magnetizing curve is obtained when local magnetic measurements are performed. In addition, loss parameters are recovered with an acceptable recovery error. The presented results are validated by comparison with the exact material characteristics. The presented results depict that the magnetic characteristics of the material inside a commercial asynchronous motor can be identified accurately by interpreting local magnetic measurements into a numerical model.