Relation between Magnetic Properties of Stator Core and Cogging Torque in 8-pole 12-slot SPM Synchronous Motors

Imamori, Satoshi; Ohguchi, Hideki; Shuto, Masao; Toba, Akio

doi:10.1541/ieejjia.4.696

Cited by 6 publications

(7 citation statements)

References 12 publications

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“…Compared with the results obtained when the calculation is based on the magnetic energy variation with respect to the angular rotor position given by (1), in [18] it is shown that both methods obtain almost identical results.…”

Section: Cogging Torque Measurementmentioning

confidence: 82%

“…This means the cogging torque waveform moves in opposite directions in each machine half and the cogging caused by each machine half may be cancelled out depending on the shifted angle. Other studies focus on the shape of PM edges, concluding that their size can be reduced on the magnet sides to lessen air gap reluctance variation, which reduces the magnetic energy variation in the machine and, therefore, mitigates the cogging torque [17,18].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator

García-Gracia¹,

Romero²,

Ciudad³

et al. 2018

Preprint

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Cogging torque is a pulsating, parasitic and undesired torque ripple intrinsic of the design of a permanent magnet synchronous generator (PMSG), which should be minimized due to its adverse effects: vibration and noise. In addition, as aerodynamic power is low during start-up at low wind speeds in small wind energy systems, the cogging torque must be as low as possible to achieve a low cut-in speed. A novel mitigation technique using compound pre-slotting, based on a combination of magnetic and non-magnetic materials, is investigated. The finite element technique is used to calculate the cogging torque of a real PMSG design for a small wind turbine, with and without using compound pre-slotting. The results show that cogging torque can be reduced by a factor of 48% with this technique, while avoiding the main drawback of the conventional pre-slotting technique: the reduction of induced voltage due to leakage flux between stator teeth. Furthermore, through a combination of pre-slotting and other cogging torque optimization techniques, 84%, cogging torque can be eliminated for a given design.

show abstract

Section: Cogging Torque Measurementmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator

García-Gracia¹,

Romero²,

Ciudad³

et al. 2018

Preprint

View full text Add to dashboard Cite

show abstract

“…In Ref. [3], the authors quantitatively investigated the relationship between the magnetic properties of the stator core and cogging torque by an eight-pole 12-slot surface-type PMSM (SPMSM). The main component of the cogging torque pulsates by the number of the least common multiple of pole and slot number per one rotation of the rotor.…”

Section: Considering Materials Characteristics Somementioning

confidence: 99%

“…These achievements have been highlighted by many researchers who have proposed novel approaches to improve motor performance. Three groups of topics will be introduced in this paper: optimal design methods [1][2][3][4][5][6][7][8][9], novel motor structures [10][11][12][13][14][15][16], and novel control methods [17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

A research trend of electric machines with development of finite element analysis

Hijikata

Akatsu

2017

IEEJ Transactions Elec Engng

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Finite element analysis (FEA) has rapidly developed in the past three decades. In case of the magnetic field analysis, many researchers have proposed different electric machines by using FEA in order to achieve high efficiency, high torque density, low torque ripple, and so on. For further development of electric machines, this paper presents a literature survey on the state‐of‐the‐art research trends of the electric machine related to FEA in the last 3 years. © 2017 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

show abstract

Section: Introductionmentioning

confidence: 99%

Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator

García-Gracia

Romero

Ciudad³

et al. 2018

Energies

View full text Add to dashboard Cite

Cogging torque is a pulsating, parasitic, and undesired torque ripple intrinsic of the design of a permanent magnet synchronous generator (PMSG), which should be minimized due to its adverse effects: vibration and noise. In addition, as aerodynamic power is low during start-up at low wind speeds in small wind energy systems, the cogging torque must be as low as possible to achieve a low cut-in speed. A novel mitigation technique using compound pre-slotting, based on a combination of magnetic and non-magnetic materials, is investigated. The finite element technique is used to calculate the cogging torque of a real PMSG design for a small wind turbine, with and without using compound pre-slotting. The results show that cogging torque can be reduced by a factor of 48% with this technique, while avoiding the main drawback of the conventional closed slot technique: the reduction of induced voltage due to leakage flux between stator teeth. Furthermore, through a combination of pre-slotting and other cogging torque optimization techniques, cogging torque can be reduced by 84% for a given design.

show abstract

Relation between Magnetic Properties of Stator Core and Cogging Torque in 8-pole 12-slot SPM Synchronous Motors

Cited by 6 publications

References 12 publications

Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator

Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator

A research trend of electric machines with development of finite element analysis

Cogging Torque Reduction Based on a New Pre-Slot Technique for a Small Wind Generator

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