Measurement of Core-Loss Distribution Using Thermography

In recent years, high-power electric motors have been mounted on mobile platforms such as electric vehicles. These motors are required to be compact, lightweight, and highly efficient. The reduction of core loss that occurs in electrical steels is an important factor in efficiency. Because core loss is ultimately converted into heat, it can be estimated by measuring the amount of heat generated. Methods for directly measuring the core loss in electrical steel sheets with thermistors and thermocouples have been proposed, but in these methods, many constraints complicate the measurements. In addition, the measurements are not suitable for a large number of sampling points. The aim of this study is to measure the distribution of core loss in electrical steel sheets by using thermography.