Abstract
Wind turbine (WT) technology becomes more and more important due to the serious environmental and energy issues. The toothed poles outer rotor doubly salient permanent magnet (DSPM) generator with simple and durable design, high torque and high-power density has a great prospect in wind turbines application. The large diameter makes the construction of such a machine more convenient due to the installation of the turbine blades directly to the outer rotor generator surface. Nevertheless, the size of the generator must be increased to provide larger output power. This increases the generator’s mass. Thus, larger massive DSPM generators are undesirable in wind turbine design. In this paper, an optimization design procedure of the outer rotor doubly salient permanent magnet generator ORDSPMG is proposed for 10 kW WT application. The reduction of the generator weight is demonstrated and proofed. The considered machine version is characterized by having the same effective axial length and output torque imposed by the specifications relative to the 10 kW direct drive WT. An optimization procedure using a fast and effective method, namely the symbiotic organism search (SOS) algorithm coupled to a parametric two dimensional finite elements analysis (2D-FEA), is employed to optimize the machine parameters. The main parameters affecting the generator design are also analyzed. The results obtained reveal that the proposed generator topology presents low weight and thus high torque density among other satisfactory characteristics.
Highlights
According to the rated speed of the wind turbine (WT), the Wind turbine (WT) drive concepts are classified into high speed drives, medium speed
The recent advances in several fields help the doubly salient permanent magnet (DSPM) machines to obtain performances comparable to those of permanent magnets (PM) synchronous machines [6,7,17,19]. The majority of this type of machines proposed for the wind power application are with the stator and rotor pole number, respectively, 6/4, 8/6, 12/10, 36/24 [20,21]; these machines are efficient when it comes to applications at high and medium speeds, but they become unsuitable at low speed ones, because their volume is directly linked to the value of its sizing torque
The analysis of the design and optimization of an outer rotor doubly salient permanent magnet generator (ORDSPMG), dedicated for a direct-drive wind system, by the symbiotic organism search (SOS) algorithm coupled with the finite element method was analyzed and presented
Summary
The low-speed concepts seem better than the high and medium speed concepts since they present high reliability and improved efficiency, due to the elimination gearboxes including a reduction in maintenance and the installation costs (due to lesser number of components) and compact size leading to the simplistic design [10,11,12,13,14] These machines (working as generators) are designed taking into consideration specific criteria so that they can be integrated into the power generation system. The majority of this type of machines proposed for the wind power application are with the stator and rotor pole number, respectively, 6/4, 8/6, 12/10, 36/24 [20,21]; these machines are efficient when it comes to applications at high and medium speeds, but they become unsuitable at low speed ones, because their volume is directly linked to the value of its sizing torque.
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