Analysis and Design of Innovative Magnetic Wedges for High Efficiency Permanent Magnet Synchronous Machines

Frosini, Lucia; Pastura, Marco

doi:10.3390/en13010255

Cited by 10 publications

(8 citation statements)

References 31 publications

(43 reference statements)

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“…This research focuses on the performance evaluation of a double-layer SM-PMSG. This configuration is advantageous for direct-drive wind generators in terms of weight, cost, and torque ripple [19][20][21][22]. To minimize the 5th and 7th harmonics, the pitch factor is chosen as 5/6.…”

Section: Methodology 21 Pmsg Configurationmentioning

confidence: 99%

Torque ripple and mass minimization of a 20-MW direct drive offshore wind generator

Hoang

Nguyen

2022

UD-JST

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This article investigates the structural optimization of a 20-MW offshore wind generator to minimize the torque ripple and mass. The surface-mounted permanent magnet topology will be chosen for the generator. In addition, the double-layer armature winding configuration will be utilized. The direct-drive technology will be adopted to increase the reliability of the offshore wind energy conversion system. The multi-objective optimization of the generator is carried out based on the particle swarm algorithm. Results show that the torque ripple of the optimal model is significantly reduced to as much as 0.41% at full-load conditions making the configuration suitable for the high-power offshore wind generator.

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Section: Methodology 21 Pmsg Configurationmentioning

confidence: 99%

Torque ripple and mass minimization of a 20-MW direct drive offshore wind generator

Hoang

Nguyen

2022

UD-JST

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“…For example, useful relative permeability is μ r = 20 according to FEA in Reference, 5 while the measured value of magnetic wedges is μ r = 4. Besides, useful relative permeability is μ r = 100 according to FEA in Reference, 6 while the measured value of magnetic wedges is μ r = 3.5; that is calculated magnetic characteristics were not realized. In addition, the relationship between relative permeability and saturation flux density was not clarified in References 3–6 .…”

Section: Introductionmentioning

confidence: 98%

“…Besides, useful relative permeability is μ r = 100 according to FEA in Reference, 6 while the measured value of magnetic wedges is μ r = 3.5; that is calculated magnetic characteristics were not realized. In addition, the relationship between relative permeability and saturation flux density was not clarified in References 3–6 . Furthermore, slot opening is narrow in small‐sized motors, and block‐shaped wedges assumed in References 3–6 can be hardly inserted.…”

Section: Introductionmentioning

confidence: 98%

“…In addition, the relationship between relative permeability and saturation flux density was not clarified in References. [3][4][5][6] Furthermore, slot opening is narrow in small-sized motors, and block-shaped wedges assumed in References [3][4][5][6] can be hardly inserted. Thus, there are no studies in which the performance of magnetic wedges was sufficiently realized in actual motors, and comprehensive research is needed on magnetic materials with regard to motor manufacture.…”

Section: Introductionmentioning

confidence: 99%

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Formulation and mixing conditions of magnetic composite materials used for magnetic wedges in an interior permanent magnet synchronous motor

Horiuchi

Yoshida

Nirei

et al. 2023

Electrical Engineering Japan

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An interior permanent magnet synchronous motor (IPMSM) is characterized by its high efficiency. However, torque ripple and loss occur because of the spatial harmonics generated by air‐gap permeance fluctuations. This study clarified that slot harmonic components can be suppressed by inserting magnetic wedges made of magnetic composite material in the slot opening of an IPMSM. First, the authors examined the torque and loss characteristics by varying relative permeability and saturation magnetic flux density of magnetic wedges using finite element analysis (FEA). Results indicated that the torque ripple and loss could be suppressed when the relative permeability of the magnetic wedge was μr = 10 to 22 and the saturation magnetic flux density was Bs = 0.5 to 0.75 T. Furthermore, the authors produced magnetic composite materials made of various soft magnetic material powders and examined their magnetic properties and viscosities. Results showed that a magnetic composite material with optimal magnetic properties and injectable viscosity could be manufactured using Fe‐Si‐Al with a low volume fraction.

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“…Permanent magnet motors have concentrated and distributed winding, and each winding method has its own advantages for improving efficiency. For concentrated winding, the winding resistance is reduced as well as the copper loss, since its coil end can be manufactured shorter than that of the distributed winding [14]. Furthermore, the eddy current loss of the rotor tends to increase at high-speed rotation in the concentrated winding because it has more spatial harmonics than distributed winding [15,16].…”

Section: Introductionmentioning

confidence: 99%

Reducing Rotor Temperature Rise in Concentrated Winding Motor by Using Magnetic Powder Mixed Resin Ring

et al. 2020

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The demand for high-speed servomotors is increasing, and minimal losses in both high-speed and high-torque regions are required. Copper loss reduction in permanent magnet motors can be achieved by configuring concentrated winding, but there are more spatial harmonics compared with distributed winding. At high-speed rotation, the eddy current loss of the rotor increases, and efficiency tends to decrease. Therefore, we propose a motor in which a composite ring made from resin material mixed with magnetic powder is mounted on the stator to suppress spatial harmonics. This paper describes three characteristic motor types, namely, open-slot motors, composite-ring motors, and closed-slot motors. Spatial harmonics are reduced significantly in composite-ring motors, and rotor eddy current loss is reduced by more than 50% compared with open-slot motors. Thermal analysis suggests that the saturation temperature rise value is reduced by more than 30 K. The use of a composite ring is effective in reducing magnet eddy current loss during high-speed rotation. Conversely, the torque characteristics in the closed-slot motor are greatly reduced as well as the efficiency. Magnetic circuits and simulations show that on electrical steel sheets with high relative permeability, the ring significantly reduces the torque flux passing through the stator, thus reducing the torque constant. To achieve reduced eddy current loss during high-speed rotation while ensuring torque characteristics with the composite ring, it is necessary to set the relative permeability and thickness of the composite ring according to motor specifications.

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Analysis and Design of Innovative Magnetic Wedges for High Efficiency Permanent Magnet Synchronous Machines

Cited by 10 publications

References 31 publications

Torque ripple and mass minimization of a 20-MW direct drive offshore wind generator

Torque ripple and mass minimization of a 20-MW direct drive offshore wind generator

Formulation and mixing conditions of magnetic composite materials used for magnetic wedges in an interior permanent magnet synchronous motor

Reducing Rotor Temperature Rise in Concentrated Winding Motor by Using Magnetic Powder Mixed Resin Ring

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