Harmonic Iron Loss Analysis of Rotating Machines: Practical Macro Modeling for Stress and Hysteresis

摘要

In this symposium, I present harmonic iron loss analysis of rotating machines that considers effects of multi-axial mechanical stress and hysteresis phenomenon by introducing practical macro modeling. First, the effect of the multi-axial stress on the loss is investigated by material experiments. An approximated modeling, which requires only the measured loss with uniaxial stress, is also introduced. Fig. 1 shows the experimental system, in which arbitrary 2-axial stress can be imposed on the specimen of an electrical steel sheet by the actuators noted 1 and 2. The magnetic field is applied along the direction of the force produced by actuator 1. The specimen is an electrical steel sheet with 3% silicon.