Evaluation of the Iron Loss Distribution of the Actual Stator Core Using Small Excitation Inner Cores

Abstract

To obtain the basic data to manufacture the highly effective rotating machine, the axial iron loss distribution of an actual stator core of the complex structure was evaluated by using the small excitation inner core. The laminated thickness of this small excitation inner core is approximately 1/6 of the thickness of the stator core. Therefore, the circumferential iron loss distribution of the stator core and the axial iron loss distribution of a stator core can be measured by using this small excitation inner core. Then, to compare the difference of the axial iron loss distribution in the stator core, we investigated the axial iron loss distribution in the actual stator core after two manufacturing processes, the laminating process and the shrink fitting process. The iron losses were measured in three places (the edge, the quarter part, and the center) of two stator cores. As a result of our investigation, the axial iron loss distribution in the actual stator core clearly changed. This paper reports on the axial iron loss distribution in two manufacturing processes in two actual stator cores measured by using the small excitation inner core.

Building Factor Evaluation of the Stator Core Made of Ultrathin Electrical Steel Sheet for the High-Speed Motor

“…The values of K h and K e in Equation (4) were calculated by the dual frequency separation method using W i500 (f ex =500Hz) and W i1000 (f ex =1000Hz). W h and W e were obtained using Equation (5). Anomalous eddy-current loss was not considered.…”

“…[1][2][3]. This problem is referred to as the building factor problem [4][5]. This building factor problem occurs in the stator core of the high-speed motor as well.…”

Evaluation of frame-induced compressive stress on the magnetic properties of stator cores using the excitation inner core method

“…However, a general method of evaluating the iron loss of the stator core has not been yet established. Therefore, we developed the excitation inner core method to evaluate the circumferential and axial distribution of the iron loss of the actual stator core [6][7][8]. In this study, we are presenting two variations on of the excitation inner core method.…”