Cogging torque reduction design of dual stator radial flux permanent magnet generator for small wind turbine
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In this paper, the design for an electromagnetic structure and reduction cogging torque of a dual stator structured radial flux permanent magnet generator, which is a combination of the inner- and outer-rotor types, has been proposed. We call this a dual stator radial flux permanent magnet generator. To reduce the cogging torque, firstly, stator tooth pairing was designed; secondly, stator displacement was designed and and finally, stator tooth pairing and stator displacement were carried out simultaneously. We found the optimal design condition about stator tooth pairing angle combination and stator displacement angle for cogging torque minimization. As a result, a cogging was reduced by 93.3[%] by this study.Keywords:
Cogging torque
Cogging torque
Shunt generator
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The cogging torque of permanent magnet synchronous generator (PMSG) is a main part of the starting resistance moment(SRM) for wind turbine, it is serious large at the very low wind speed. A novel method of minimizing the cogging torque by shifting permanent magnet pole is proposed based on different slotpole combination for PMSG. Different FEA models are set up to validate the proposed method and are illustrated how to choose the offset angle of permanent magnet pole and discuss its influence on cogging torque value for the wind generator.
Cogging torque
Wind generator
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This paper presents the determination of a numerical indicator that allows the quick comparison of the cogging torque in permanent magnet synchronous machines (PMSMs) with both segmented stator and conventional stator structures, considering different pole/slot combinations. By means of two-dimensional finite element simulations of 18 different machine designs, it was proven that comparison indicators used for conventional PMSMs cannot be implemented for PMSMs with segmented stator core. Instead, the proposed indicator considers the change of periodicity in PMSMs with segmented stator core and enables two relevant phases of the design stage of the PMSMs: the effective comparison of the magnitude of the torque cogging for different pole/slot combinations on segmented machines; and the comparison between PMSMs with conventional stator and segmented stator.
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The characteristic of rotor and stator vibration signals under run-impact status is studied.Firstly,the characteristic and rules of rotor and stator vibration signals under rub-impact status are studied.Rotor and stator vibration feature with different rotor speed is analyzed through experiment.Through the analysis of stator vibration characteristic,the pulse force from rub-impact may lead to stator resonance,so it can be brought out to diagnose rubimpact faults.Results reveal that the stator resonance signals can indicate rub-impact faults.The conclusions can give basis for the vibration character of the stator and the detection of rub-impact signals for the rotor system.
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This paper addresses itself to the inter-influence on the stator and rotor fault detection in induction motors. The reason why the detection of stator fault is influenced adversely to a certain extent by rotor fault is clearly revealed by study based on the electromagnetic mechanism. Rotor fault results in edge frequency components emerged in stator current. The conventional algorithm of negative sequence component of stator current, which is usually regarded as the most typical indicator of stator fault, gives rise to a false negative sequence component due to the modulation of edge frequency components in stator current, and might influence the detection of stator fault. The problem whether stator fault influences the detection of rotor fault or not is quantitatively discussed on the standpoint of electromagnetic mechanism, and a few interesting conclusions have been drawn. Namely, stator fault indeed results in edge frequency components emerged in stator current, which is usually regarded as the most typical indicator of rotor fault, and thus influence the detection of rotor fault in theory. However, the amplitudes of the edge frequency components derived from incipient even some severe stator fault are rather small with respect to those derived from rotor fault, and not be detectable from the practice’s point of view, and thus do not confuse the indicator of rotor fault.
Wound rotor motor
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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
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The influence of certain design parameters on cogging torque developed by 2MW permanent magnet synchronous wind power generator was investigated.It is shown that the slot and pole number combination has a significant influence on cogging torque,and influences the optimal value of both skew angle and magnet arc,as well as determines the optimal number of auxiliary teeth/slots.A simple factor,which is proportional to their smallest common multiple,has been introduced to specify the goodness of the slot and pole number combination.In general,the higher the goodness factor the larger the cogging torque.The simulation results verify the effect of the proposed method.
Cogging torque
Wind generator
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Cogging torque
Shunt generator
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Abstract Cogging torque generated in permanent magnet machine effects to some undesirable vibration and noises. In order to minimize the cogging torque in permanent magnet is the most important issues recently. This paper investigated the influence of the value of height and length of slotting in magnet edge on the cogging torque reduction. For purpose of study the structure of 24 slot/10 pole of permanent magnet machines have been chosen. The 2-D finite element based on FEMM 4.2 software was implemented to compute the permanent magnet machine performance. Simulation results showed that by optimising the height and length of slotting in magnet edge can reduce the cogging torque of permanent magnet machine significantly. The most effective way by employing a-two step slotting with 2.5 mm of height and 0.7 mm of length of the slotting in magnet in the first step of slotting. In the second step of in magnet edge, the length of slotting has been assigned as much as 2.3 mm and the height of slotting was 0.588635 mm. By employing the FEMM, three of different magnet structures of permanent magnet machine were analysed. It was found that the cogging torque of permanent magnet machine proposed magnet structure as much as 99.7 % compared with the initial structure of the permanent magnet machine.
Cogging torque
Electropermanent magnet
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