Direct-Drive Contactless Wind Generator with Concentrated Winding

N. Levin 1 , V. Pugachov 1 , and S. Orlova 1
  • 1 Institute of Physical Energetics, 21 Aizkraukles Str., Riga, LV-1006, LATVIA

Direct-Drive Contactless Wind Generator with Concentrated Winding

A clear trend has emerged in the field of wind power industry concerning the creation of low-, medium-, and even high-power direct-drive wind turbines without the use of gearboxes. Such generators are usually multipolar and mostly excited from permanent magnets. In the low-speed performance, multipolarity means a higher specific torque and reliability as well as lower operating costs, which in the case of high-speed generators is hindered by gearboxes. Multipolarity with a high specific torque can be achieved mainly through the use of permanent magnets of high-energy materials (such as NdFeB) and through design solutions for the armature winding. The authors compare two most common types of wind generator's armature windings: the distributed one, which contains a coil embracing several teeth, and the concentrated armature winding - with one coil for one stator tooth. The comparison (along with the experience in developing the wind turbines) shows that the con-centrated winding version has a number of advantages, the main of them being the multipolarity. This means that the generator with a concentrated winding can be more acceptable for the direct-drive wind turbines, is easier to make and simpler to operate. Another very important advantage of concentrated windings shown in this work is that they allow achievement of a higher specific electromagnetic torque, which means smaller size and weight of such a generator in the low-speed version.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • Kopilov, I., & Ljadova, T. (1988). Wind turbine without gearbox. Hydro project, Nr.129, 170-174 (in Russian).

  • Levin, N., & Serebrjakov, A. (1991). Inductor generator in small power wind turbine. Energy buildings, (3), 53-55 (in Russian).

  • Dirba, J., Levin, N., & Pugachov, V. (2006). Vēja Energijas elektromehāniskie pārveidotāji. Rīga: RTU, p. 312 (in Latvian).

  • Spooner, E., & Williamson, A. (1996). Direct coupled permanent magnet generators for wind turbine applications. IEEE proceedings, Electric Power Appl., 143 (1).

  • Postnikov, I. (1975). Total theory and transiet processes in electrical machines. Moscow: High School, 220 (in Russian).

  • Kopilov, I. (1987). Mathematical modelling of electrical machine. Moscow: High School, 248 (in Russian).


Journal + Issues