Abstract
The application of wind turbine technology in low wind speed regions such as Southeast Asia has recently attracted increased attention. Wind turbines are designed as special structures with low starting torque, and many starting torque minimization processes exist for permanent magnet synchronous generators (PMSGs). Plurality is applied to decrease the starting torque in radial flux permanent magnet disk generators. The most popular starting torque minimization method uses a magnet skew technique. When used at 20°, this technique reduced starting torque by 4.72% (on load) under 500 rpm at 50 Hz for 120 min. By contrast, a PMSG with magnet skew conditions set at under 2° reduced electrical power by 3.86%. For high-speed PMSGs, magnet skew techniques affect the generation of heat in the coils (stator), with heat decrease at the middle of the coil, on its surface and between the coils at 2.90%, 3.10% and 2.40%, respectively. PMSGs were installed in vertical axis wind turbines (VAWTs), and heat generation in relation to wind speed and electrical power was assessed. Magnet skew techniques can be used in PMSGs to reduce staring torque, while skew techniques also reduce electrical power and heat generated at the stator.
Highlights
Introduction published maps and institutional affilNowadays, electrical power generation using alternative energy sources, wind current energy [1], has attracted increasing attention to reduce dependence on the decreasing supply of fossil fuels and ameliorate environmental pollution
Direct-drive wind turbines must be economically viable compared to other power generation systems in terms of cost per unit torque force, torque density, weight of fluent materials, efficiency, overall volume, overall length, outer diameter, energy efficiency per charge, annual energy efficiency and overall cost
In a permanent magnet synchronous generators (PMSGs), the starting torque can be obtained by calculating the partial differential of the flux in the air gap areas related to the rotation angle of the rotor or stator [17]
Summary
This investigation used Bakelite plates for the 10 mm thick fabric of the rotor and stator.
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