Cogging torque reduction with pole slot combination and notch

Yusivar, Feri; Roy, Hardik; Gunawan, Ridwan; Halim, Abdul

doi:10.1109/iceecs.2014.7045258

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…There are various combined methods are studied for PM machines. For example, the combination of rotor magnet skewing with teeth notching by B. Zhang [21] and the combined pole and slot number by F. Yusivar [37]. The 3D structural view of SKCpp is depicted in Figure 24.…”

Section: Combined Auxiliary Model Of Frmmentioning

confidence: 99%

Design and Performance Assessment of a Small-Scale Ferrite-PM Flux Reversal Wind Generator

2020

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Currently, there is increasing research interest in harnessing wind energy for power generation by means of non-conventional electrical machines e.g., flux-reversal machines. The flux reversal machine is usually designed using scarce rare–earth permanent magnet material which may be unattractive in terms of machine cost. In this study, an attempt is made to re-design the flux reversal machine with non-rare-earth ferrite permanent magnet for wind energy applications. Because these machines possess high cogging torque, which results in vibration and noise, that are detrimental to the machine performance, especially at low speeds, a novel combined skewed and circumferential rotor pole pairing method is developed. The proposed cogging torque reduction method is implemented in 2-dimensional finite element analysis modeling and comparatively analyzed with other existing stand-alone methods viz., skewing, and rotor pole pairing. The results show that the proposed method led to 94.8% and 71% reduction in the cogging torque and torque ripple compared to the reference generator, respectively. However, the calculated torque density is reduced by 13%. Overall, the electromagnetic performance of the proposed ferrite PM machine exhibits desirable qualities as an alternative design for the direct drive wind generator.

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Section: Combined Auxiliary Model Of Frmmentioning

confidence: 99%

Design and Performance Assessment of a Small-Scale Ferrite-PM Flux Reversal Wind Generator

2020

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“…Researcher in [9] mentioned, by selecting the optimal rotor pole arc, the effect of cogging torque not only can be reduced, but also results in improved harmonic content of the back EMF. For this study, an axial rotor pole pairing configuration with outer pole outer pole arc of 28.0mm and 33.0mm is as illustrated in Figure 5 [18], Bin Zhang combined teeth notching with rotor magnets skewing [19] and Gyeong-Chan Lee has combined the stator tooth pairing with stator displacement which results in reducing the cogging torque effect up to 93.3% [2]. In this paper, the combination methods are combining skewing with pole pairing (SkPop) and skewing with axial pole pairing (SkApp) at the rotor part.…”

Section: Radial Pole Pairingmentioning

confidence: 99%

New Cogging Torque Reduction Methods for Permanent Magnet Machine

Bahrim

Sulaiman

Kumar

et al. 2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Permanent magnet type motors (PMs) especially permanent magnet synchronous motor (PMSM) are expanding its limbs in industrial application system and widely used in various applications. The key features of this machine include high power and torque density, extending speed range, high efficiency, better dynamic performance and good flux-weakening capability. Nevertheless, high in cogging torque, which may cause noise and vibration, is one of the threat of the machine performance. Therefore, with the aid of 3-D finite element analysis (FEA) and simulation using JMAG Designer, this paper proposed new method for cogging torque reduction. Based on the simulation, methods of combining the skewing with radial pole pairing method and skewing with axial pole pairing method reduces the cogging torque effect up to 71.86% and 65.69% simultaneously. IntroductionFor the last decade, the demand of permanent magnet motors (PMs) with wide application prospect are receiving spotlight due to the advance development of high performance permanent magnet materials and manufacturing technology. In various PM motors, an interior-type permanent magnet motor (IPM) which magnet are inserted inside the rotor rather than bounding the surface shows better performances in flux weakening operation and achieve higher flux density due to the small air gap that allows to impose a magnetizing current effectively [1]. IPM motors are commonly used for industrial drives, electrical vehicle applications and generation systems as it has high element execution, and vitality change efficiency. However, due to PM air gap length, IPM create an extensive cogging torque issues.The cogging torque or also known as detent torque and 'no-current' is a famous issue, which happened in PM motors. The components of cogging torque are produce by the interaction PM and slotted iron structure, and shows itself by the propensity of a rotor to adjust in various stable positions even when a motor is not energized. This deteriorates the machine operation, performance of position control system, generating acoustic noises and vibrations, speed pulsations, harmonics distortion, and premature wear of the bearings during low speed [2]. The communications between PMs mounted on the rotor and anisotropy began by stator windings slots raised the cogging torque and variations of the magnetic field energy during the rotation, as indicated by [3]:

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“…For the winding of BLDC Motor, fractional slot winding is often used because of two main reasons [7,9], First, the cogging torque is decreased [2,6,8,10,11,13]. Second, we can increase the number of poles even if the number of slots is small [12,14].…”

Section: Introductionmentioning

confidence: 99%

Selecting Method for Number of Slots and Poles in Brushless Direct Current Motor

Han,

Kim,

et al. 2024

JEPES

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Cogging torque is produced by the magnetic interaction between the stator core and the permanent magnet attached to the rotor. If we use the fractional slot winding, we can decrease cogging torque. In this paper, we propose a method to select number of poles and number of slots reasonably so as to satisfy the three technical requirements (the number of slots of unit winding per phase must be integer, the three-phase symmetric situation must be satisfied, the number of slots per pole per phase must be larger than 0.25.) and two economical requirements (coil pitch factor must be larger than 0.5, winding factor must be larger than 0.85.) of Brushless DC motor. We also propose a method to select a number of poles and a number of slots so that the goodness coefficient is small and the periodic coefficient is large to decrease cogging torque.

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Cogging torque reduction with pole slot combination and notch

Cited by 5 publications

References 2 publications

Design and Performance Assessment of a Small-Scale Ferrite-PM Flux Reversal Wind Generator

Design and Performance Assessment of a Small-Scale Ferrite-PM Flux Reversal Wind Generator

New Cogging Torque Reduction Methods for Permanent Magnet Machine

Selecting Method for Number of Slots and Poles in Brushless Direct Current Motor

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