Torque ripple reduction using magnet pole shaping in a surface mounted Permanent Magnet BLDC motor

Upadhayay, Pranshu; Rajagopal, Karthikeyan

doi:10.1109/icrera.2013.6749809

Cited by 19 publications

(14 citation statements)

References 11 publications

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“…To achieve an optimally designed product, two different S/N ratios are calculated using Eqs. (4) and (5). If the goal is to maximize the response, the S/N ratio is taken as "larger is better" (LIB) and is defined as…”

Section: Optimization With the Taguchi Methodsmentioning

confidence: 99%

“…There has been much research on slot and permanent-magnet (PM) designs. These include designing the slot opening to minimize the torque ripple [1]; studying the influence of slot-opening width, pole-arc coefficient, magnet thickness, and air-gap size on electromotive force (EMF) harmonics [2]; varying the width of the magnet poles to minimize the cogging torque [3]; showing the significant effects of pole-arc coefficient, eccentricity, and magnet shape on the harmonic content and cogging torque [4]; increasing the PM offset without significant reduction in back-EMF and motor efficiency [5]; and determining the optimal split ratio for an external-rotor PMSM [6].…”

Section: Introductionmentioning

confidence: 99%

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Multiresponse optimization to improve the torque behavior of an outer-rotor permanent-magnet machine using gray relational analysis based on the Taguchi method

Özoğlu¹

2017

Turk J Elec Eng & Comp Sci

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Abstract:The torque behavior of an outer-rotor surface-mounted permanent-magnet machine is improved by identifying seven pertinent design variables, including rotor height. The optimal design variables are revealed by analyzing 18 experiments determined by the Taguchi method for the minimum torque ripple, minimum total harmonic distortion of the induced voltage, and maximum average torque. In addition, the optimal design variables are obtained very quickly by using gray relational analysis based on the Taguchi method with the single response of the gray relational grade instead of multiple responses. A considerable amount of multiresponse improvement is achieved according to the results of the two optimizations. Performance improvements of 20.6%, 32.0%, and 24.5% are obtained for the average torque, the torque ripple, and the total harmonic distortion of the back-EMF, respectively.

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Section: Optimization With the Taguchi Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multiresponse optimization to improve the torque behavior of an outer-rotor permanent-magnet machine using gray relational analysis based on the Taguchi method

Özoğlu¹

2017

Turk J Elec Eng & Comp Sci

View full text Add to dashboard Cite

show abstract

“…A similar approach by Dajaku and Gerling reduced torque ripple through a new stator design with right-and left-shifted slot openings to minimize the cogging torque (Dajaku & Gerling, 2014). Upadhayay and Rajagopal used the magnet pole shaping technique for torque ripple reduction on a 12 poles and 18 slots surface mounted permanent magnet brushless DC motor (Upadhayay & Rajagopal, 2013). The performance parameters were computed and analyzed by twodimensional finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

Edge-rounded Magnet Poles for Reducing the Torque Ripple on a Radial Flux Inset Permanent Magnet Generator

Handini

Setiabudy²,

Gunawan³

et al. 2018

IJTech

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This study reports a novel strategy for minimizing torque ripple in a radial flux inset permanent magnet (RFIPM) generator by using a geometric modification of the magnet poles. We simulate the design of three different types of edge-rounded magnet (ERM) poles using finite element method magnetics (FEMM) software for a 16 poles and 24 slots RFIPM generator. We found that the edge-rounding of magnet poles significantly lowered the torque ripple of the generator with a reduction of about 74% (torque ripple of 7.76%). In addition, the modified RFIPM generator exhibited enhanced flux density uniformity in the air-gap of the generator (up to ~ 48.8%), leading to a smoother line of flux density.

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“…A sinusoidal pulse-width-modulation (SPWM) shaped magnet on the SPM motor was designed by maximizing the output torque and efficiency [6]. Magnet shifting was used to improve the torque, and the rotor-pole outer surface was shaped to reduce the cogging torque of an IPM BLDC motor [7]. It was shown that skewing the stator slot opening distributes the effects of the interaction between the PM edge and the slot opening during rotation of the slot pitch [8].…”

Section: Introductionmentioning

confidence: 99%

“…They focused on the rotor core alone [1,2], both the rotor and stator cores [3], the magnet [4][5][6], both the rotor core and magnet [7], the slot [8,9], both the slot and the magnet [10,11], or the teeth [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

New magnet shape for reducing torque ripple in an outer-rotor permanent-magnet machine

Özoğlu¹

2017

Turk J Elec Eng & Comp Sci

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Torque ripple is a major problem for permanent-magnet (PM) machines. It is examined by focusing on the magnetic circuit of the PM machine. Because there is a relationship between the torque ripple and the magnetic energy that is stored in the magnetic field along the air gap of the PM machine, a variation in the magnetic energy was revealed initially. A new magnet geometry is obtained by forming ledges and notches in the permanent magnets to modify the variation of the magnetic energy and the fluctuation in torque. Thus, a new PM design is proposed in this study to minimize the torque ripple of an outer-rotor surface-mounted PM machine. An improvement of 44.6% in the torque ripple is achieved thanks to the new magnet design. In addition, improvements are made in the average torque and the total harmonic distortion of the back electromotive force.

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Torque ripple reduction using magnet pole shaping in a surface mounted Permanent Magnet BLDC motor

Cited by 19 publications

References 11 publications

Multiresponse optimization to improve the torque behavior of an outer-rotor permanent-magnet machine using gray relational analysis based on the Taguchi method

Multiresponse optimization to improve the torque behavior of an outer-rotor permanent-magnet machine using gray relational analysis based on the Taguchi method

Edge-rounded Magnet Poles for Reducing the Torque Ripple on a Radial Flux Inset Permanent Magnet Generator

New magnet shape for reducing torque ripple in an outer-rotor permanent-magnet machine

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