Study on the Axial Leakage Magnetic Flux in a Spoke Type Permanent Magnet Synchronous Motor

Lee, Sung Gu; Bae, Jae-Nam; Kim, Won‐Ho

doi:10.1109/tia.2019.2939743

Cited by 13 publications

(5 citation statements)

References 8 publications

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“…The final motor designs were selected based on the high torque density. It was noticed that the axial flux leakage degrades the motor torque performance [21] but the magnetic field end-effects were not considered in our 2D models.…”

Section: Selection Of Slot Pole Number Of Motormentioning

confidence: 99%

Investigation of an Interior Micro Permanent Magnet Synchronous Motor

Pang¹,

Shi²,

Chang³

et al. 2021

Energies

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This study describes the development of the world’s smallest interior permanent magnet synchronous motor (IPMSM) to increase the torque density of micromotors. The research evaluates the feasibility of the miniaturization of IPMSM since recent studies in this area focus on medium to large size compressor and traction motor applications. The standard-type and spoke-type IPMSM were selected for ease of micro machining. In order to surpass the performance of an inset motor of the same size used in previous research, the interior motors were designed with a different slot pole number, permanent magnet shape and rotor structure. Two types of interior motors were manufactured and tested to compare their performance. It was shown that the spoke-type interior motor had a better output torque, while the standard-type interior motor had a lower torque ripple, and both motors matched the specifications of commercially available motors. To achieve a higher torque density, the IPMSM designs increased the slot pole number from 6 slots 4 poles to 9 slots 6 poles. The torque density of the spoke-type motor was increased by 48% compared to the inset motor. The disadvantage is that the new design has a greater number of parts and smaller size, resulting in difficulties in manufacturing and assembly.

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Section: Selection Of Slot Pole Number Of Motormentioning

confidence: 99%

Investigation of an Interior Micro Permanent Magnet Synchronous Motor

Pang¹,

Shi²,

Chang³

et al. 2021

Energies

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“…However, as the magnetic energy of ferrite PMs is relatively low, it is difficult to ensure sufficiently high torque generation with non-rareearth PM motors. To improve the torque-generating ability, therefore, a spoke-type ferrite PM motor using many magnets and with a magnetic flux-concentration effect has been proposed [5][6][7][8][9][10][11][12]. Because these spoke-type ferrite PM motors use many ferrite PMs in the confined space of the rotor, their mechanical strength may be reduced and the d-axis inductance may decrease.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of a novel spoke‐type motor to reduce the use of rare‐earth magnet materials

Seok

Choi

Seo

2021

IET Electric Power Appl

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In this study, a novel design for a tilted spoke-type hybrid permanent magnet synchronous motor (TH-PMSM) that uses two types of permanent magnet (PM) materials is proposed to reduce the consumption of rare-earth PM materials. The key feature of this motor is securing space by tilting the permanent magnet, so that more PMs can be used in the limited rotor space. In addition, based on the centre axis of the rotor, the rare-earth magnets are positioned deeper inside than ferrite PMs to maximise the torque density and reduce the leakage magnetic flux that occurs around the centre of the rotor. Moreover, unlike ordinary spoke-type rotors, it is designed with an integral core like the rotor of the interior permanent magnet synchronous motor (IPMSM), so it is structurally safe even at high speeds. To ensure that the proposed motor is efficiently designed, the output torque, PM cost, cogging torque, and torque ripple were compared with those of the conventional rare-earth PM motors with the same overall dimensions. The validity of the proposed motor was verified by the results of a finite element method simulation and experiments on the fabricated motor.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.

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“…Additionally, position-dependent effects such as flux leakage are represented by a constant parameter, which is usually difficult to accurately calculate analytically [21]. In this respect, numerical approaches such as the finite element analysis (FEA) may offer an advantage, as they enable the numerical computation of such non-linear effects from the material and dimensional parameters of the system [22].…”

Section: Introductionmentioning

confidence: 99%

Multiphysics finite element model for the computation of the electro-mechanical dynamics of a hybrid reluctance actuator

Cigarini

Csencsics

Schlarp

et al. 2020

Mathematical and Computer Modelling of Dynamical Systems

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In hybrid reluctance actuators, the achievable closed-loop system bandwidth is affected by the eddy currents and hysteresis in the ferromagnetic components and the mechanical resonance modes. Such effects must be accurately predicted to achieve high performance via feedback control. Therefore, a multiphysics electromechanical finite element model is proposed in this paper to compute the dynamics of a 2-DoF hybrid reluctance actuator. An electromagnetic simulation is adopted to compute the electromagnetic dynamics and the actuation torque, which is employed as input for a structural dynamic simulation computing the electromechanical frequency response function. For model validation, the simulated and measured frequency response plots are compared for two actuators with solid and laminated outer yoke, respectively. In both cases, the model accurately predicts the measurement results, with a maximum relative phase error of 1.7% between the first resonance frequency and 1 kHz and a relative error of 1.5% for the second resonance frequency..

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Study on the Axial Leakage Magnetic Flux in a Spoke Type Permanent Magnet Synchronous Motor

Cited by 13 publications

References 8 publications

Investigation of an Interior Micro Permanent Magnet Synchronous Motor

Investigation of an Interior Micro Permanent Magnet Synchronous Motor

Design and analysis of a novel spoke‐type motor to reduce the use of rare‐earth magnet materials

Multiphysics finite element model for the computation of the electro-mechanical dynamics of a hybrid reluctance actuator

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