Comparative Analysis of Two Types of Generators with Permanent Magnets for Wind Turbine

The results of numerical studies of two types of permanent magnet electric generators for wind turbines are given: multi-pole with an external rotor; integrated with a magnetic gearbox. For given sizes of the generator (outer diameter of the stator, axial length of the stator), the configuration and dimensions of the magnetic system of the gearbox are determined, at which the maximum power value is reached for the specified speed range of the wind rotor n = 100 ÷ 200 rpm. The dependences of voltage and power of two types of generators are determined when they are connected via a rectifier diode bridge to an active load. It is shown that with identical stator sizes, the generator with an integrated magnetic gearbox has about 10 times more power than a multipole generator with an external rotor, while the mass of active materials of the generator with a magnetic gearbox is only 1.8 times larger than that of an external rotor. The calculation of the characteristics of the studied generators is made in the software packages Simcenter MagNet and Simcenter MotorSolve.