A unique direct driven permanent magnet synchronous generator has been designed and constructed. Results from simulations as\nwell as from the first experimental tests are presented. The generator has been specifically designed to be directly driven by a vertical\naxis wind turbine and has an unusually low reactance. Generators for wind turbines with full variable speed should maintain a\nhigh efficiency for the whole operational regime. Furthermore, for this application, requirements are placed on high generator\ntorque capability for the whole operational regime. These issues are elaborated in the paper and studied through simulations.\nIt is shown that the generator fulfils the expectations. An electrical control can effectively substitute a mechanical pitch control.\nFurthermore, results from measurements of magnetic flux density in the airgap and no load voltage coincide with simulations.\nThe electromagnetic simulations of the generator are performed by using an electromagnetic model solved in a finite element\nenvironment.
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