Abstract
A novel Vernier type magnetically geared direct-drive generator for large wind turbines is introduced in this paper. Conventional Vernier-type machines and most of the direct-drive wind turbine generators use excessive amount of permanent magnet, which increases the overall cost and makes the manufacturing process challenging. In this paper, an electrically excited (PM_less) claw-pole type Vernier machine is presented. This new topology has the potential of reducing mass and cost of the generator, and can make the construction easy in manufacturing and handling. Analytical designs are verified using 3D finite-element simulations and several designs are evaluated to find the optimum design for a 7.5 MW, 12 rpm wind turbine application. It is shown, that the required torque can be achieved with an outer diameter of 7.5 m, and with a mass of 172 t (including the structural mass). The proposed generator is compared with commercial direct-drive generators, and it is found that the proposed generator has the highest torque density with 34.7 kNm/t.
Highlights
Wind energy has the potential of playing an important role in the future electricity generation.Within the few past decades, wind turbine technology has become quite mature and is moving forward with a fast-growing rate
In [18], a magnetically geared generator called Pseudo Direct Drive (PDD) is proposed for direct drive wind turbine applications. This generator promises a high torque density and reasonable power factor; it is composed of two rotating parts, which make the structure complex and less robust to be used as an offshore wind turbine generator
A novel Electrically Excited Claw Pole Vernier (EECPV) generator is proposed for Direct-Drive wind turbine applications
Summary
Wind energy has the potential of playing an important role in the future electricity generation. In [18], a magnetically geared generator called Pseudo Direct Drive (PDD) is proposed for direct drive wind turbine applications This generator promises a high torque density and reasonable power factor; it is composed of two rotating parts, which make the structure complex and less robust to be used as an offshore wind turbine generator. A novel Electrically Excited Claw Pole Vernier (EECPV) generator is proposed for Direct-Drive wind turbine applications This topology adapts claw pole rotor with a single loop field winding and a conventional laminated stator carrying three phase winding. Thanks to the rotor claw pole structure, the generator has a single loop field winding As results of such a simple field winding, the proposed generator has lower field copper loss and higher efficiency compared to conventional EESM machines.
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