Abstract
In designing motors, one must grasp the magnetic properties of electrical steel sheets considering actual conditions in motors. Especially important is grasping the stress dependence of magnetic power loss. This paper describes a newly developed apparatus to measure two-dimensional (2-D) magnetic properties (properties under the arbitrary alternating and the rotating flux conditions) of electrical steel sheets under compressive stress normal to the sheet surface. The apparatus has a 2-D magnetic excitation circuit to generate magnetic fields in arbitrary directions in the evaluation area. It also has a pressing unit to apply compressive stress normal to the sheet surface. During measurement, it is important to apply uniform stress throughout the evaluation area. Therefore, we have developed a new flux density sensor using needle probe method. It is composed of thin copper foils sputtered on electrical steel sheets. By using this sensor, the stress can be applied to the surface of the specimen without influence of this sensor. This paper described the details of newly developed apparatus with this sensor, and measurement results of iron loss by using are shown.
Highlights
When designing highly efficient motors, techniques are required for accurate estimation of the iron loss of their cores
Ascertaining the stress dependence of the iron loss is especially important because the influence of iron loss by stress is greater than the others
According to the relevant literature,[5,6] the magnetic properties under the alternating flux conditions in the in-plane direction have been evaluated under conditions in which stress normal to a surface is applied to the electrical steel sheet
Summary
According to the relevant literature,[5,6] the magnetic properties under the alternating flux conditions in the in-plane direction have been evaluated under conditions in which stress normal to a surface is applied to the electrical steel sheet. Those evaluations were conducted under conditions of alternating flux in one direction. One is a flux density sensor with a thin needle probe comprising copper foils sputtered onto electrical steel sheets Another is a magnetic field sensor with H-coils with extremely low surface roughness. “stress” is expressed as an abbreviation for “stress normal to the surface of the electric steel sheet”
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