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view as shown in figure 9. The experiment was performed using the hands-on approach as well as with the analysis system and a comparison of the results are given in Table 1. The entire system is implemented on a Visual Basic platform. The finite element program is written in C++. An ‘Active–X’ control is designed to yield a ‘control’ that is included in the visual basic toolbox and implemented onto a Visual Basic form. Through the introduction screen, the user will be able to select different machines and find other information such as theoretical data, design data, analysis results at other load conditions, manufacturer data and other pertinent information. This introduction screen will eventually lead into the actual “analysis” screen, the control program and complete instruction on how to achieve real time analysis.

HARDWARE IMPLEMENTATION

In this section, we explain the hardware implementation of the real-time electromagnetic field analysis system for the energy conversion laboratory. The initial work was originally developed using the Visual Basic environment (VB5), but with a hardware manufactured by the American Data Acquisition Corp. (ADAC), based on a Data Acquisition board 5500MF. With the continuous development of computer tools, that package became obsolete and considerably limited in I/O channels and control capabilities, compared with the options offered by the newly acquired National Instruments package [6], based on a Data Acquisition Card PCI-6025E and the Component Works™ software. It was necessary to continue with the conversion of the existing program code to match the National Instruments package (FE software, ActiveX controls, and data acquisition hardware) keeping the same display format as Figure 10). TABLE I Tabulation of Results Comparison

Resistan Exper iment FE % ce al Efficiency Er r or [ ] Efficiency % % 333.3 90 90.35 0.389 400 88.24 89 0.861 500 85.71 87 1.505 666.7 82.61 83.8 1.441 1000 76.92 77.9 1.274 2000 62.5 64.2 2.72

The second direction was towards the manufacture and supplies of all the necessary hardware required to carry on satisfactorily the experiments and communicate with the computer in a safe manner, as well as being practical and easy to operate by the students. The experiments are grouped in a manner that with no changes in physical connections, different characteristics of the machines can be observed and evaluated, under different operating and load conditions. This is the reason why the selection of the additional experiments to be included in the application was based on their similarity. Through the introduction screen (Figure

Proceeding of the 2004 American Society for Engineering Education Annual Conference &Exposition Copyright © 2004, American Society for Engineering Education

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Yen, K., & Mohammed, O. (2004, June), A Real Time Analysis Of Electric Machines Through Electromagnetic Field Computation And Laboratory Implementation Paper presented at 2004 Annual Conference, Salt Lake City, Utah. 10.18260/1-2--13818