Search results
1 – 2 of 2Katsumi Yamazaki, Yuki Yamato, Hisashi Mogi, Chikara Kaido, Akihito Nakahara, Kazuhiko Takahashi, Kazumasa Ide and Ken'ichi Hattori
The purpose of this paper is to investigate the distribution of in‐plane eddy currents in stator core packets of turbine generators, and to reveal the loss reduction effect by the…
Abstract
Purpose
The purpose of this paper is to investigate the distribution of in‐plane eddy currents in stator core packets of turbine generators, and to reveal the loss reduction effect by the slits in the stator teeth.
Design/methodology/approach
The in‐plane eddy currents are calculated by a 3D finite element method that considers lamination of electrical steel sheets. First, this method is applied to a simple model that simulates the stator core of the turbine generators. The calculated losses are compared with the measured losses in order to confirm the validity. Next, the same method is applied to a 250 MVA class turbine generator.
Findings
The validity of the calculation method is confirmed by the measurement of the simple model. By applying this method to the turbine generator, it is clarified that the considerable in‐plane eddy currents are generated not only at the end stator packets, but also at the top of the teeth of the interior packets due to the duct space. It is also clarified that the in‐plane eddy‐current loss decreases as nearly half by the slits of the stator teeth.
Originality/value
A reliable calculation method for the in‐plane eddy‐current loss in the turbine generators is developed. The results obtained by this method are valuable for the design of the generator from the viewpoint of heat conduction.
Details
Keywords
The Women's Empowerment League, or WE League, was officially launched in September of 2021 as Japan's ‘first professional women's league’. While the WE League was indeed new and…
Abstract
The Women's Empowerment League, or WE League, was officially launched in September of 2021 as Japan's ‘first professional women's league’. While the WE League was indeed new and categorically different from previous semi-professional leagues in Japan, the declaration that it was the first professional league belied the fact that women's football in Japan had witnessed various forms and degrees of professionalisation over the course of more than 30 years. While full professionalisation is a logical and important goal as women seek equity with men on football pitches and in other sports, I propose that revisiting the history of Japan's women's League provides useful material for contemplating the diverse factors that have motivated support for women's football, driven and derailed international success, and prompted increased professionalisation. Additionally, I argue here that although commercial and advertising interests in women's football have grown in recent years in Japan, the WE League's platform of social welfare and ‘women's empowerment’ is simply the newest iteration of a discourse packaging women's football as emblematic of progressive politics and ‘first-world’ gender norms, which has motivated much of the financial backing – from both the Japan Football Association (JFA) and corporate ranks – of teams and women professionals for the last three decades. Numerous stakeholders have sincere desires to improve not only the status of women's football but also of women in their country; however, the marketing and promotional messaging aimed at furthering those goals commodify critical issues such as women's empowerment and equal opportunity, and thus run the risk of depoliticising them.
Details