Design and Experimental Analysis for Reduction of Cogging Torque by Pole Shifting in Permanent Magnet Synchronous Generator

H Mamur,I Atacak,F Korkmaz,M Ari,I Topaloglu

doi:10.5755/j01.eee.20.8.8438

H Mamur, I Atacak + Show 3 more

Open Access

https://doi.org/10.5755/j01.eee.20.8.8438

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Abstract

This paper presents an application of the pole shifting technique used for reducing the cogging torque of permanent magnet synchronous generators (PMSGs) that employs in micro wind turbines (MWTs). The effectiveness of the pole shifting technique on the cogging torque reduction of the PMSG has been tested by the cogging torque measurement system that has been connected with a MWT. In order to evaluate the performance of the proposed technique, two internal rotors for the PMSG on the measurement system, namely internal rotor with the pole shifting and internal rotor without the pole shifting, have been designed and fabricated. The measurement results and analyses have showed that the PMSG with the pole shifting has a very low cogging torque when comparing to the PMSG without the pole shifting. DOI: http://dx.doi.org/10.5755/j01.eee.20.8.8438

Highlights

In some rural regions, in which there is not an electricity network, electricity generation by wind energy has become more efficient and inexpensive than other renewable energy resources
While the cogging torque values are being taken, no load has been connected across the permanent magnet synchronous generators (PMSGs)
There are some small fluctuations in the cogging torque values due to the different angle placement faults of the permanent magnets (PMs)

Summary

Introduction

In which there is not an electricity network, electricity generation by wind energy has become more efficient and inexpensive than other renewable energy resources. Before the installation of a wind energy system, it is a necessity to do analyses related to the wind power in the regions where the system is installed and the expected investment cost. Many methods have been developed for these analyses [2]. Such analyses for micro wind turbines (MWTs) are not required to be fulfilled due to the low cost of installation [3]. In the MWTs, the PMSGs have been more widely utilized than the IGs because of direct drive and high efficiency [5]. The PMSGs have the high torque density and the power factor characteristics [6]. One of the biggest disadvantages of the PMSGs is the high cogging torque

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