| Popis: |
In recent years, electrification of cars and airplanes has been increasingly promoted. Therefore, the demand for higher efficiency motors is remarkably increasing. When high-efficiency motor is designed, the loss estimation is performed by numerical electromagnetic field analysis in advance of the practical manufacturing. To realize highly accurate loss estimation, it is necessary to utilize the magnetic properties of the electromagnetic steel sheet measured with high accuracy. In this paper, a basic study on magnetic property measurement using a single-sheet tester designed in our laboratory is carried out. Then, a technique to efficiently control the secondary-side voltage waveform to a sinusoidal wave using an optimization method is developed. The validity of the proposed system by comparing the results obtained from the proposed system with the those derived from the conventional waveform control technique is demonstrated. |
