Modellering av en generator för en CRWT

Sammanfattning: Researchers from Uppsala University have carried out a project with a vertical axis wind turbine (VAWT). This was designed for 12 kW. An extension to this project is to be carried out where a counter-clockwise rotating turbine is to be added. This means that two rotations are created and that a solution for the generator needs to be implemented so that the different rotations can be turned into electrical power. The new project is intended to function as a Counter Rotational Wind Turbine and result in a generator with a rated output of 30 kW. The idea with the addition of a counterclockwise rotating part is to double the electrical power extracted by the alternator without an increase in RPM. The objective of this project will be to investigate the design of a generator whose stator and rotor both rotate in opposite directions. The aim is to theoretically design such a generator and find out suitable parameters for it. During this process, the aim is also to gain a broad and clear understanding of generators in general and test whether Aluminum can be used in the construction. To test and explore the theory around CRWT, two generators of 10 kW and 30 kW respectively will be created based on the Rutger generator. The Rutger generator is the one used in the project for a 12 kW VAWT. Two generators are created to explore how a generator can be scaled up/down in power. The 10 kW generator will then be drawn in the program Solidworks to evaluate the mechanical design.The generators were first simulated in the program KALK, which is a program created by researchers at Uppsala University. This software performs calculations by invoking the program ACE and using FEM to calculate various parameters of generators. The 10 kW generator was first created from a file containing the Rutgers parameters. After optimizations, the 30 kW generator was created based on the 10 kW file. After simulations in Solidworks and KALK, it was found that a generator that theoretically works as a CRWT has been created and is stable. It was also determined that a more comprehensive feasibility study is required to succeed with a mechanical design for a CRWT and not theoretical. Aluminum was a sustainable material for the stator frame based on the results from FEMbut may need further testing.