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In this paper, the design and analysis of a modified outer rotor PMA has been presented, which increases the efficiency and machine capacity by minimizing the cogging torque. The modified outer rotor type PMA will be suitable for extremely low-speed wind turbine based power generation system. The performances of the machine are analyzed by simulation using ANSOFT MAXWEL software, and the results are...
This paper focuses on design analysis issues of direct driven permanent magnet synchronous generator (DDPMSG) which are widely used in large scale wind turbines. The permanent magnet synchronous generator (PMSG) of 1.5 MW output power which is driven directly without gear system is analyzed by Maxwell 2D RMxprt. The characteristics of generator include the cogging torque, induced coil voltages at...
The outer rotor permanent magnet alternator is unrivaled for low-speed wind turbine frameworks because of it's robust structure, low maintenance and construction cost while the inner rotor permanent magnet alternators are most economically accessible for its customary auxiliary setup. In this research, a comparative study of design and performance analysis between an inner rotor PMA and an outer rotor...
One of the radial generator problems is in its cogging torque production which leads to the decrease of output power. Cogging torque in radial generator is caused by air gap width variance between stator and rotor. This paper presents the method to reduce cogging torque in dual-stator radial flux permanent magnet generator (DS-RFPMG). It is a radial generator which has two stators located on the inner...
This paper presents a complex design of Small Wind Turbine with AC/DC converter containing Maximum Power Point Tracking Algorithm. The paper describes a general issues, phenomenon and problems connected with designing particular parts for small wind turbine, such a generator or wind rotor. In addition, it shows short discussion between two different Maximum Power Point Tracking approaches, simulation...
Mechanical interactions between a wind turbine and a direct-driven permanent-magnet synchronous generator (PMSG) are studied, and a model to analyze the system behavior is suggested. The proposed model can be applied to analyze the mechanical vibrations of direct-driven wind turbine installations both in steady state and in dynamic cases. The cogging torque and torque ripple of the PMSG are used as...
This study evaluates the power characteristics of a novel permanent magnet flux switching generator (PMFSG) for a low-speed wind turbine. The PMFSG is an outer-rotor type generator. An induced voltage is generated by the change in the magnetic flux flow when the relative position of the teeth changes. The 2-D finite element method (2D-FEM) is used to analyze the PMFSG. The results reveal that the...
The paper presents numerical and experimental results of a 1.6 KW and 3 kW wind generators with permanent magnet claw poles. A 3D model based on finite element method (FEM) considering the nonlinearity of the magnetic circuit and the movement of armatures was used to calculate the generator's characteristics at load and no-load. Experimental tests were conducted in order to validate the numerically...
Cogging torque is inherent characteristic of PMSG, it affects significantly the cut-in speed of the turbine of wind energy PMSG generation systems. FEM has proved to be the most powerful tool to calculate cogging torque and other important performance of PMSG. In this paper, an improved Maxwell stress tensor method, which can take into account the detailed variation of flux density in the triangular...
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