Optimization on Magnetization-Regulation Performance of a Variable-Flux Machine with Parallel Permanent Magnets

Wang, Mingqiao; Yu, Bin; Tong, Chengde; Oiao, Guangyuan; Liu, Faliang; Yang, Shijie; Zheng, Ping

doi:10.1109/cefc46938.2020.9451409

Cited by 4 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The approximate demagnetizing factor N d for a cubeshaped permanent magnet is 1 3 [6]. The internal magnetic field along the BH curve (demagnetization from the second to the third quadrant) changed the direction without reaching the saturation point.…”

Section: A Approximations and Tolerancesmentioning

confidence: 99%

“…The main purpose of this paper is to provide empirical data for modelling Alnico permanent magnets (PMs) using the finite element method (FEM), especially in simulations of electrical machines, where understanding of demagnetization behaviour is crucial for the operation [1], [2]. Also, a mathematical model of MH a curves for different directions of applied field and a simplified PM model were developed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Measurement and Modelling of Hysteresis Curves for Nonlinear Permanent Magnets at Different Inclination Angles

Ibrayeva,

Lind,

Silva

et al. 2023

2023 IEEE International Magnetic Conference (INTERMAG)

View full text Add to dashboard Cite

This paper presents the measurement results of the BH/MH curves of the Alnico 8 (LNGT40) with recoil loops and a mathematical model for the calculation of the average magnetic flux density in a cubic permanent magnet. The measurements were performed with a Vibrating Sample Magnetometer (VSM). The magnet samples have a cubic shape with 3 mm sides. BH curves in preferred (easy) and transverse directions and recoil loops were measured and compared to Alnico 9 (LNGT72) as well as to the data from the supplier. The load line of the cubic magnet in 0 A/m applied magnetic field was found. A mathematical model was developed which can approximate the MHa curve for an applied field with an arbitrarily chosen angle between the field and easy axis, given MHa curves for 0 o and 90 o . Also, a simplified general model of a cubic permanent magnet in the air and calculation results of stored energy and hysteresis losses were presented.

show abstract

Section: A Approximations and Tolerancesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Measurement and Modelling of Hysteresis Curves for Nonlinear Permanent Magnets at Different Inclination Angles

Ibrayeva,

Lind,

Silva

et al. 2023

2023 IEEE International Magnetic Conference (INTERMAG)

View full text Add to dashboard Cite

show abstract

“…To make a complete comparison, the general series and parallel types of variable flux motors [25,26] are designed for the same HCF magnet usage. The stator and rotor dimensions also remain the same as that for the final type of design.…”

Section: Comparison Of Anisotropic and Isotropic Vfs-pmsms By Simulationmentioning

confidence: 99%

“…Conversely, it requires a larger impulse current to switch from flux enhancing to weakening. For the parallel type of H-VFM [25], an active flux leakage bypass is established which is advantageous for flux regulation. Hua et al compared the series and parallel types of H-VFMs and revealed that the operating point of the LCF magnet in the parallel type is unstable [26].…”

Section: Introductionmentioning

confidence: 99%

“…To simultaneously achieve the above-mentioned advantages, i.e., high torque density, excellent flux regulation ability, low demagnetization risk, low magnetizing impulse current demand, high efficiency at high speed, and expanded motor operating range, this paper proposes a novel VFS-PMSM topology combining HCF magnets and anisotropic LCF magnets, instead of the isotropic LCF magnet used in a previous study [32]. The method of swiveling the magnetic pole of the LCF magnet [32] is adopted, which differs from the previously mentioned methods that magnetize/demagnetize the magnets in the same axis [18][19][20][21][22][23][24][25][26][27][28][29][30][31]. It should be noted that there is a significant difference in flux generated and magnetizing field required between the easy and hard axes in the anisotropic magnets.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Swiveling Magnetization for Anisotropic Magnets for Variable Flux Spoke-Type Permanent Magnet Motor Applied to Electric Vehicles

Lee

Hsieh

2022

Energies

View full text Add to dashboard Cite

This paper investigates the application of anisotropic low-coercive force (LCF) magnets to a novel variable-flux spoke-type permanent magnet synchronous motor (VFS-PMSM) for electrical vehicles with a wide speed range. In the VFS-PMSM, flux is regulated by swiveling the magnetization of the anisotropic LCF magnets instead of directly magnetizing or demagnetizing them. The previously proposed VFS-PMSM uses only isotropic LCF magnets for easily swiveling the magnetic pole direction, resulting in lower torque density. The challenge thus lies in the feasibility to swivel the magnetic pole direction of the anisotropic LCF magnet, and the impact of the different magnetization strengths of the anisotropic magnets on the motor performance. This paper first studies the feasibility to swivel the magnetization direction of anisotropic LCF magnets through experiments. It is confirmed that the magnetization direction can be successfully swiveled by 90 degrees with a reduced external magnetizing field. Then, two VFS-PMSM topologies and various rotor configurations are compared in terms of key performance indices to determine critical sizing factors for performance enhancement. Finite element analysis is used for simulations. In comparison with the VFS-PMSM equipped with isotropic LCF magnets, the maximum torque of the proposed topology can be improved for the same flux adjustment ability. Alternatively, the flux adjustment ability can also be enhanced by 37.43% for the same maximum torque.

show abstract

Magnet Pole Design Improvement of Novel Hybrid-Pole Variable Flux Memory Machine

Tu,

Yang,

Lin

et al. 2023

2023 IEEE Energy Conversion Congress and Exposition (ECCE)

View full text Add to dashboard Cite

Optimization on Magnetization-Regulation Performance of a Variable-Flux Machine with Parallel Permanent Magnets

Cited by 4 publications

References 10 publications

Measurement and Modelling of Hysteresis Curves for Nonlinear Permanent Magnets at Different Inclination Angles

Measurement and Modelling of Hysteresis Curves for Nonlinear Permanent Magnets at Different Inclination Angles

Swiveling Magnetization for Anisotropic Magnets for Variable Flux Spoke-Type Permanent Magnet Motor Applied to Electric Vehicles

Magnet Pole Design Improvement of Novel Hybrid-Pole Variable Flux Memory Machine

Contact Info

Product

Resources

About