The main components of loss depend on the operating point. One of these components is stray load loss. The stray load loss as a physical phenomenon is caused by eddy currents generated in the parts inside equipment, but unlike iron loss, copper loss, and mechanical loss, the locations of occurrence are not clear. In many cases, eddy currents generated in magnets, model edges, press rings, etc. are a problem. In addition, the stray load loss is often caused by leakage flux, main magnetic flux space harmonics, and time harmonics. Along with the miniaturization and high efficiency of equipment, stray load loss may cause loss analysis accuracy error, which is a non-negligible component (1).