Affiliations: [a] Faculty of Engineering, Oita University, Dannoharu,
Oita Japan | [b] Oita Industrial Research Institute, Takaenishi, Oita,
Japan | Institute of Electrodynamics, Microwave and Circuit
Engineering, University of Technology, Vienna, Austria
Abstract: Electrical steel sheet that is used as a core in electrical machines
deteriorates due to residual stress and external stress. The magnetic
properties and stress need to be clarified in order to effectively utilize
electrical steel sheet in electrical machines. We have measured the residual
stress distribution in a motor core using an X-ray stress measurement device
and clarified not only the tensile and compressive stress distributions, but
also the shear stress distribution. In this study, a new measurement system is
developed for determining vector magnetic properties under shear stress. The
vector magnetic properties of the non-oriented electrical steel sheets under
the alternating magnetic flux and rotating magnetic flux conditions were
measured with the developed system. As the result, it was clear that the
magnitude of the magnetic field strength vector and the magnetic power loss
along the direction of about 135° increased by applying the shear stress.
Keywords: Non-oriented electrical steel sheet, vector magnetic property, shear stress, magnetic anisotropy, stress tensors
