Influence of Core Stress on Performance of Permanent Magnet Synchronous Motor

Abstract

The motor core stress produced during the manufacturing process and motor operation changes the electromagnetic characteristics of the iron core. Thus, research on electromagnetic calculations under the condition of stress is one of the key challenges to achieve more efficient designs of permanent magnet motors. In this paper, the stress equations of a rotor centrifuge and stator interference assembly are studied, and the changing regularity of stress and magnetic properties of electrical steel and its causes are analyzed theoretically. A device for measuring the stress and magnetic properties of electrical steel is designed and tested. Then, a model for iron loss calculations that includes stress is proposed for improved design. The effects of stress on loss, d-q axis inductance, and torque are simulated and compared using an IPMSM as an example. The feasibility and accuracy of this method are verified by comparing the simulation and prototype test results.

Transient Magnetic Properties of Non-Grain Oriented Silicon Steel under Multi-Physics Field

“…In addition to the excitations, the microstructure of silicon steel will change with the change in stress [ 8 , 9 ], thus causing effects to its magnetic properties. When it is applied with external force, silicon steel will show magneto elastic properties [ 10 ] and stress demagnetization [ 7 ], which will also promote or deteriorate the magnetization of silicon steel. With the increase in tensile stress, most of the silicon steel will show a trend that its magnetic density firstly increases and then decreases.…”

Analysis of Cylindrically and Spherically Embossed Flux Barriers in Non-oriented Electrical Steel

“…The inverse magnetostrictive effect describes the correlation between mechanical stress and magnetic material behavior. These studies focused on the effect of mechanical stress caused by dynamic loads, like centrifugal forces [2], or of processing induced residual stress, e.g. by blanking [3], on the magnetic properties of non-oriented electrical steel.…”