Design and performance analysis of magnetic slot wedge application in double‐fed asynchronous motor‐generator by finite‐element method

Abstract

In this study, an improvement method for double-fed asynchronous motor-generators (DFAMG) design with open slots is proposed to reduce the capacity demand of rotor converter for the first time. The proposed method is achieved by decreasing the air-gap length (AGL) and applying conductive and magnetic rotor slot wedges. The design method of magnetic slot wedges and AGL in large DFAMG is presented. The mechanical analysis of a large DFAMG prototype reveals the necessity of using metal rotor wedges. To precisely investigate the influence of magnetic wedges in DFAMG, a two-dimensional fieldcircuit coupled model is proposed to consider the effects of rotor converter. Several wedge configurations of commercially available products are designed and analysed. The relationships between the electromagnetic properties of rotor wedges and prototype performance are investigated. The feasibility and advantage of the proposed method in DFAMG design are verified. A guidance for applying the proposed method in design improvement of large DFAMG is developed.

Electric Field Evaluation Using the Finite Element Method and Proxy Models for the Design of Stator Slots in a Permanent Magnet Synchronous Motor

“…After evaluating the meshes, an asymptotic behavior is found, and in this way, the variations become smaller until the algorithm converges [37]. The elements are connected through nodal points, and these form a mesh [38], as shown in Figure 3 for analysis with triangular elements. The evaluation through the finer meshes achieves the necessary accuracy of the electric field for this model, considering that a more detailed evaluation results in a greater computational effort, without significant improvement in the results.…”

Design of Asynchronous Motor With 3 Phase 600 kW Power Short Circuit Cage Rotor: Physical Dimensioning and Electrical Calculations

“…Öncelikle olarak tanımlanan tasarım kriterleri ve performans değerlerine bağlı olarak motorun tüm fiziksel ve elektriksel büyüklükleri hesaplanmıştır. Ve hesaplamaların sonuçlarına bağlı olarak motorun, istenen güç değerlerini ve tasarım performans kriterlerini sağladığı gösterilmiştir (Xu et al, 2002;Naderi, 2016;Barakin et al, 2018;Fireteanu et al, 2018;Xiao et al, 2018;Khlifi, 2019;Kvatinsky, 2019;Perach and Wuerdig et al, 2019).…”

“…Ancak asenkron motorlar daha ucuzdur ve daha az bakıma ihtiyaç duyarlar. Dahası asenkron motorların çalışması sırasında elektrik arkı meydana gelmez (Doğru akım motorları çalışırken kollektör dilimleri ile fırçalar arasında kıvılcımlar çıkar) (Xu et al, 2002;Naderi, 2016;Barakin et al, 2018;Fireteanu et al, 2018;Xiao et al, 2018;Khlifi, 2019;Perach and Kvatinsky, 2019;Wuerdig et al, 2019).…”

Effect of magnetic slot wedge on the performance of bulb tubular turbine generator

“…Scholars have done relevant research on improving the distribution of air gap magnetic field of the electric machine by using magnetic wedges (Xiao et al , 2018; De Donato et al , 2012; Schmülling and Kulig, 2015). Some experts had studied the induction motor performance when the magnetic slot wedges are installed, and the results show that the magnetic slot wedges can improve the efficiency and reduce the temperature rise of the induction motor (Gaerke and Hernandez, 2013; Mikami et al , 1997).…”