Toward a theory of organizational elements

Thesis (S.M.)--Massachusetts Institute of Technology, Sloan School of Management, 2005.Includes bibliographical references (leaf 71).Businesses are complex organizations with seemingly limitless interconnectedness and functionality. Organizational Charts are the limit to which many organizations consider their internal structure, while others build workflow models to identify and codify every keystroke and communique. In order to provide a middle ground between superficial Organizational Charts and elaborate workflow models, this thesis develops a simple and broadly applicable method of modeling organizations. In particular, ideas from computer program structuring are transplanted into organizational design. Initially, a theory of Organizational Elements is defined. Then characteristics common to the elements of the framework are explored and a small set of example elements is identified and developed. Finally, the framework is applied to two example organizations and recommendations for further work are presented.by Alson Remington Kemp, III.S.M

Use of multiple loop model for brushless doubly fed machine rotor design

The Brushless Doubly Fed Machine (BDFM) is receiving attention as a candidate for use in adjustable speed drives (ASDs) and variable speed generators (VSGs). With a large percentage of a drive or generator system's cost due to power electronics content, considerable research has been conducted to find drives in which the power electronics can be minimized. Generally, the power electronics in a drive must be able to process the full apparent power rating of the machine. With the BDFM, the power electronics must only process a fraction of the apparent power rating of the machine, and so can be less expensive than alternative solutions. Rotor designs for the BDFM have assumed that the currents in the rotor bars are evenly distributed and have used equal area rotor bars. Qualitative observation suggested that rotor currents are not distributed equally between the rotor bars. Test data and novel simulation methods were used to quantitatively assess the current distributions in the rotor bars. Rotor current distributions can be investigated three ways: finite element analysis, test data from a modified BDFM, and simulation using a novel multiple rotor circuit model. The latter two methods were employed to obtain the results presented in this thesis. The multiple loop model of the BDFM is presented and use of the model is described. To demonstrate the capabilities of the model, designs for two different applications is presented