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The development of a Variable Electromotive Force Generator (VEMFG) is explored from design conception to physical testing. The concept revolves around a deconstructed generator, where the stator is allowed to move over the fixed location rotor. This design allows for a relatively large generator to perform similarly to a small generator when input power is low. This results in a decrease in the effective minimum speed, as well as an elevation of the maximum operating speed that results in power generation. This stretching of the operating envelope allows for greater efficiency of a wind turbine, by increasing the effective range of power generating wind speeds. A brief theoretical review of the new generator concept, followed by mechanical design, and finally experimental concept validation will illustrate the advantages of VEMFG. These experimental results will demonstrate the decrease of the so called cut-in speed, as well as the elevation of the cut-out speed. Also to be discussed, is an Infinitely Variable Speed Converter (IVSC) and it's application and design implications when used in conjunction with a VEMFG. Finally, a design review will discuss issues of durability, scalability, maintenance, and future applications. In addition, future areas of research interest will be presented and reviewed. |
