Hysteresis Loss in NdFeB Permanent Magnets in a Permanent Magnet Synchronous Machine

Egorov, D. A.; Petrov, Ilya; Pyrhönen, Juha; Link, Joosep; Stern, Raivo; Sergeant, Peter; Sarlioglu, Bulent

doi:10.1109/tie.2021.3050358

Cited by 22 publications

(6 citation statements)

References 25 publications

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“…These are generated by harmonic phenomena due to stator slotting during rotor rotation and switching frequency effects involved in pulse-width modulation techniques applied in the inverter supply [84]. In recent literature, numerous techniques for loss estimation in permanent magnets have been developed [85], indicating the dominance of losses due to eddy currents over hysteresis losses in most practical electric motor applications [86].…”

Section: Combined Permanent Magnet and Lamination Loss Modellingmentioning

confidence: 99%

Overview on Permanent Magnet Motor Trends and Developments

Vlachou,

Sakkas,

Xintaropoulos

et al. 2024

Energies

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The extreme environmental issues and the resulting need to save energy have turned attention to the electrification of energy applications. One of the key components involved in energy efficiency improvements is the appropriate conception and manufacturing of electric machines. This paper overviews the electromagnetic analysis governing the behavior of permanent magnets that enable substantial efficiency gains in recent electric machine developments. Particular emphasis is given to modeling the properties and losses developed in permanent magnets in emerging high speed applications. In addition, the investigation of properties and harmonic losses related to ferromagnetic materials constituting the machine magnetic circuits are equally analyzed and discussed. The experimental validation of the implemented methodologies and developed models with respect to the obtained precision is reported. The introduction of mixed numerical techniques based on the finite element method intended to appropriately represent the different physical phenomena encountered is outlined and discussed. Finally, fast and accurate simulation techniques including aggregated lumped parameter models considering harmonic losses associated with inverter supplies are discussed.

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Section: Combined Permanent Magnet and Lamination Loss Modellingmentioning

confidence: 99%

Overview on Permanent Magnet Motor Trends and Developments

Vlachou,

Sakkas,

Xintaropoulos

et al. 2024

Energies

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“…For high-speed operation, the total magnetic flux is weakened by adjusting the current phase angle to achieve highspeed rotation. Such control by adjusting the current phase angle is called weak flux control, and the IPMSM is capable of this weak flux control, which is advantageous for high-speed operation [7][8][9].…”

Section: Features Of Concentrated Winding V-ipmsm For High Speedmentioning

confidence: 99%

“…Eddy current loss of the permanent magnet causes rotor heat, and efficiency may decrease, or motor failure may occur due to heat of the rotor. Therefore, a design to reduce the hysteresis loss and the eddy current loss of the permanent magnet is required [9][10][11].…”

Section: Features Of Concentrated Winding V-ipmsm For High Speedmentioning

confidence: 99%

High-Speed Design with Separated Tapering for Reducing Cogging Torque and Torque Ripple of a 3 kW Dry Vacuum Pump Motor for the ETCH Process

Choi,

Yang,

Hong

et al. 2023

Machines

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This paper proposes a design method to reduce cogging torque and torque ripple in the concentrated winding of IPMSMs (Interior Permanent Magnet Synchronous Motors) used in motors for the semiconductor ETCH process. IPMSMs can utilize reluctance torque through the difference in inductance between the d axis and q axis, but they are at a disadvantage in terms of reducing cogging torque while tapering the rotor and stator to reduce torque ripple. In addition, the existing single tapering can push the permanent magnets into the rotor. If the rotor’s permanent magnets are embedded, the magnetic reluctance will increase, and the overall performance of the motor will decrease. However, an optimum design method was derived in which the magnets do not move during rotor tapering. This geometric design is an optimum design method that reduces cogging torque and torque ripple. This paper compares and analyzes four models, the concentrated winding model, distributed winding model, conventional tapering model, and separated tapering model, using 2D and 3D finite element analysis (FEA).

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“…Sintered bulk NdFeB based magnets with excellent magnetic performance have been extensively utilized for traction motors in hybrid vehicles and electric vehicles [1,2]. For most driving motors, NdFeB magnets need to be exposed to an environment where the temperature is higher than room temperature for long periods due to the heat generated by eddy current losses [3,4]. The temperatures in the interior and engine room can be raised to the range 85-200 • C [5,6], whereas NdFeB magnets cannot work in these high temperature operating environments owing to their low curie temperature (about 315 • C) and poor thermal stability.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Temperature Cycling on the Magnetic Degradation and Microstructure of a Zn-Coated NdFeB Magnet

Wu¹,

Long

Song³

et al. 2022

Coatings

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Temperature cycling tests in various temperature ranges were carried out to investigate the magnetic degradation of the Zn-coated NdFeB magnet. The losses of the surface magnetic field and magnetic flux were well fitted by using an index model. Compared with the lower limit temperature, the upper limit temperature had more obvious effect on the magnetic degradation. Once the upper limit temperature exceeded ≥160 °C, the magnetic degradation mainly occurred during the first cycle, which was different from the gradual decline with an increase in cycle number at a temperature of ≤140 °C. Moreover, the temperature cycling with a maximum upper limit temperature of 180 °C led to a loss of the remanence intensity, while the coercivity remained stable. Microstructure and element distribution analysis revealed that the oxidation of the Zn coating layer during the temperature cycling causes its cracking and an insertion of the oxygen element into the NdFeB substrate. The Nd-, Pr-rich phase at grain boundaries provided diffusion channels for oxygen elements, leading to a surface oxidation of NdFeB grains.

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Hysteresis Loss in NdFeB Permanent Magnets in a Permanent Magnet Synchronous Machine

Cited by 22 publications

References 25 publications

Overview on Permanent Magnet Motor Trends and Developments

Overview on Permanent Magnet Motor Trends and Developments

High-Speed Design with Separated Tapering for Reducing Cogging Torque and Torque Ripple of a 3 kW Dry Vacuum Pump Motor for the ETCH Process

The Effect of Temperature Cycling on the Magnetic Degradation and Microstructure of a Zn-Coated NdFeB Magnet

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