Shape Parameters Design for Improving Energy Efficiency of IPM Traction Motor for EV

Kim, Hae-Joong; Lee, Chung-Seong

doi:10.1109/tvt.2021.3089576

Cited by 9 publications

(4 citation statements)

References 25 publications

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“…Therefore, only the V-, T-and Δ-arrangement are analyzed further. These topologies are compared based on state-of-the-art machine designs published in [2] and [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22], which are either used in series production or have been studied in a research context on test benches (Fig. 2).…”

Section: Overview Of Synchronous Machines With Buried Permanent Magne...mentioning

confidence: 99%

“…2. Influence of permanent magnet arrangement on high-speed capability based on machine designs found in [2] and [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Only rectangular shaped permanent magnets are used for the compared V-and Δ-arrangements. The T-arrangement is distinguished between permanent magnets with a rectangular and a concentric shape.…”

Section: Overview Of Synchronous Machines With Buried Permanent Magne...mentioning

confidence: 99%

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Multi-domain analytical rotor model with buried permanent magnets in V-arrangement for high-speed applications

2024

Archives of Electrical Engineering

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Different buried permanent magnet arrangements in rotors are compared based on electrical machines found in literature regarding high-speed capability. An analytical approach is presented to analytically calculate mechanical stresses in the bilateral and central bridge of V arrangements in order to determine the achievable circumferential velocity of a rotor geometry. The mechanical model is coupled to an analytical model which can determine the flux density in the main air gap under consideration of flux leakage within the rotor. The multi-domain model enables the analytical design of high-speed rotors with buried permanent magnets in V-arrangement.

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Section: Overview Of Synchronous Machines With Buried Permanent Magne...mentioning

confidence: 99%

Section: Overview Of Synchronous Machines With Buried Permanent Magne...mentioning

confidence: 99%

Multi-domain analytical rotor model with buried permanent magnets in V-arrangement for high-speed applications

2024

Archives of Electrical Engineering

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“…In particular, it is one of the important issues to optimize driving safety and increase the driving range of EVs by using an optimized traction motor in the EV drive system. To satisfy the requirements of these traction motors, the number of vehicles using interior permanent magnet synchronous motors (IPMSMs) is increasing [1][2][3][4][5]. IPMSM has the characteristics of high efficiency and high torque density and has the advantage of being able to operate in a relatively wide high-speed range through fieldweakening control.…”

Section: Introductionmentioning

confidence: 99%

Fault Mechanism Analysis of Irreversible Demagnetization Due to the Dynamic Eccentricity of IPMSM for EV Traction

Kang

Hur

2022

IEEE Access

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The dynamic eccentricity fault (DEF) of the interior permanent magnet synchronous motor (IPMSM) is mainly caused by external mechanical shock. In the case of DEF, an unbalanced magnetic force occurs because the length of the air gap is not constant. Noise and vibration of the motor occur due to unbalanced magnetic force. In addition, since the length of the air gap is not constant, the distribution of magnetic flux density is distorted, and iron loss is increased. As the iron loss increases, the temperature rises, and an irreversible demagnetization fault (IDF) of the permanent magnet occurs due to overheating. Therefore, in this paper, the fault mechanism of IDF due to DEF of IPMSM for electric vehicle (EV) traction is analyzed. Initially, the magnetic flux density and iron loss characteristics according to the healthy condition and DEF condition are analyzed using the finite element method (FEM). Then, the detailed iron loss analysis is performed based on the phase current waveform measured through the load test of the motor. Finally, the fault mechanism of IDF due to DEF was verified through an electric-axle load test on a manufactured motor having eccentricity.INDEX TERMS Dynamic eccentricity, electric vehicle (EV), interior permanent magnet synchronous motor (IPMSM), iron loss, irreversible demagnetization.

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“…Huynh et al analyzed and compared the performances of IPMSMs and permanent-magnetassisted synchronous reluctance machines (PMa-SynRMs) on constant power speed range (CPSR) for EV applications [3]. Kim et al studied the shape parameters of IPMSMs and improved their efficiency by about 1% [4]. However, common EVs usually face various road conditions, such as high torque for hill climbing or high speed for long-distance cruises, and the constant flux linkage contributed by permanent magnets (PMs) may limit the speed of IPMSMs [5].…”

Section: Introductionmentioning

confidence: 99%

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

Lee

Hsieh

2022

Energies

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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.

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Shape Parameters Design for Improving Energy Efficiency of IPM Traction Motor for EV

Cited by 9 publications

References 25 publications

Multi-domain analytical rotor model with buried permanent magnets in V-arrangement for high-speed applications

Multi-domain analytical rotor model with buried permanent magnets in V-arrangement for high-speed applications

Fault Mechanism Analysis of Irreversible Demagnetization Due to the Dynamic Eccentricity of IPMSM for EV Traction

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

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