scholarly journals Control of Permanent-Magnet Generators Applied to Variable-Speed Wind-Energy Systems Connected to the Grid

2006 ◽  
Vol 21 (1) ◽  
pp. 130-135 ◽  
Author(s):  
M. Chinchilla ◽  
S. Arnaltes ◽  
J.C. Burgos
Keyword(s):  
Wind Energy ◽  
Permanent Magnet ◽  
Energy Systems ◽  
Variable Speed ◽  
Permanent Magnet Generators ◽  
Wind Energy Systems

scholarly journals Reduction of Cogging Torque in Dual Rotor Permanent Magnet Generator for Direct Coupled Wind Energy Systems

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Sivachandran Paulsamy
Keyword(s):  
Wind Energy ◽  
Permanent Magnet ◽  
Research Work ◽  
Energy Systems ◽  
Major Change ◽  
Element Analysis ◽  
Ongoing Research ◽  
Cogging Torque ◽  
Wind Energy Systems ◽  
Permanent Magnet Generator

In wind energy systems employing permanent magnet generator, there is an imperative need to reduce the cogging torque for smooth and reliable cut in operation. In a permanent magnet generator, cogging torque is produced due to interaction of the rotor magnets with slots and teeth of the stator. This paper is a result of an ongoing research work that deals with various methods to reduce cogging torque in dual rotor radial flux permanent magnet generator (DRFPMG) for direct coupled stand alone wind energy systems (SAWES). Three methods were applied to reduce the cogging torque in DRFPMG. The methods were changing slot opening width, changing magnet pole arc width and shifting of slot openings. A combination of these three methods was applied to reduce the cogging torque to a level suitable for direct coupled SAWES. Both determination and reduction of cogging torque were carried out by finite element analysis (FEA) using MagNet Software. The cogging torque of DRFPMG has been reduced without major change in induced emf. A prototype of 1 kW, 120 rpm DRFPMG was fabricated and tested to validate the simulation results. The test results have good agreement with the simulation predictions.

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