Characteristics of Electric Motor according to the Weld-laminated Core and the Bond-laminated Core

Abstract

This paper examines the differences between the magnetic and mechanical characteristics of the motor core depending on the lamination method (weld and bond lamination) and analyzes the effects of these differences on the motor performance and vibration using analytical methods and tests. First, to analyze the magnetic and mechanical properties of iron cores according to lamination method, the initial magnetization curve and iron loss were measured, and the natural frequencies and damping ratios were identified through a modal test. Next, no-load and blocked-rotor tests of an induction motor were performed to determine the difference in the performance of the motor according to the lamination method. At this time, the loss occurring in the motor was divided into the primary copper loss, secondary copper loss, iron loss, and mechanical loss. Finally, the output, efficiency, and vibration of the motor were measured to analyze the effects of the magnetic and mechanical characteristics on the motor performance.