A study of end turn inductance calculation of BLDC motors
This paper presents the different calculating methods of stator end turn leakage inductance at brushless dc motors (BLDC) with different winding types. The calculations are carried both analytically and numerically. The results of the two dimensional (2D) calculations have been compared with the results of three dimensional (3D) ones for the same motor. Finite Element Method (FEM) is used for 2D and 3D numerical analysis.
Squirrel cage induction motor end effects using 2D and 3D finite elements
The paper describes the calculation of the end effect parameters of squirrel cage induction motors using the finite element method. A two dimensional axisymetric problem definition offers the possibility to analyse the end ring parameters (ring resistance and inductance). Using a three dimensional approach, the correct influence of the bar currents can be taken into account. Furthermore, the three dimensional approach is necessary to calculate the stator end winding inductance and the coupling between end ring and stator end winding.
Integrated land degradation monitoring and assessment: Horizontal knowledge management at the national and international levels
The need for improved horizontal knowledge management at the national and international levels is essential for monitoring and assessment of land degradation and desertification. At the national level, governments utilise scientific, socio‐economic and technical data and information for strategic planning, priority setting and national environment and development planning. However, challenges including the lack of capacity and lack of collaboration and sharing of information across governments affect responses to and the effectiveness of monitoring and knowledge exchange, along with the ability to effectively implement treaties. At the international level, a number of Multilateral Environmental Agreements (MEAs) share cross‐sectoral themes related to research and monitoring, information exchange, technology transfer, capacity building and financial resources. The need for increased synergies stems from the similarities between the issues they address. Challenges for improving knowledge management at the international level include insufficient interaction between the scientific bodies of the various MEAs; duplication of reporting, monitoring and assessment efforts; limited knowledge management between the various assessments addressing ecosystems and biological diversity during the past decade; and insufficient collaboration between the United Nations Convention to Combat Desertification (UNCCD), the UN system and the international non‐governmental organisation (NGO) community. This paper examines these challenges and offers recommendations on how monitoring and assessment knowledge can be better managed at the national and international levels. Copyright © 2011 John Wiley & Sons, Ltd.