Analysis and Design of SPM Type Variable Flux Memory Motor Considering Demagnetization Characteristic of Permanent Magnet

Kim, Jin-Seok; Kim, Dae Woo; Park, Gyeong-Jae; Kim, Yong-Jae; Jung, Sang-Yong

doi:10.1109/tasc.2018.2790919

Cited by 7 publications

(8 citation statements)

References 8 publications

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“…Energy methods are generally much more fundamental in nature and account for multiple energy contributions [56]. Because this approach uses the change in energy, to which both coils and magnet contribute, it accounts for any variation in the parameters, such as current amplitude or change in sign, magnet demagnetization, or the variation in distance between the coils and the magnet [57], [58]. The electromagnetic force is calculated as…”

Section: ) the Proposed Force Calculation Methods Based On Change In Path Energymentioning

confidence: 99%

Novel Non-Linear Transient Path Energy Method for the Analytical Analysis of the Non-Periodic and Non-Linear Dynamics of Electrical Machines in the Time Domain

Gabdullin

2019

IEEE Access

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This paper proposes a novel analytical method for the analysis of the dynamics of electrical machines. The method is applied to the analysis of complex permanent magnet (PM)-type magnetic contactors (MCs), which exhibit strong magnetic non-linearities and a high portion of stray and leakage magnetic fluxes. The latter means that the analysis of PM-type MCs using traditional magnetic equivalent circuit (MEC) methods is impossible, thus requiring computationally expensive and time-consuming finite element analysis (FEA). To overcome the limitations of traditional MECs, the magnetic field distribution in PM-type MC is studied in great detail, and a novel non-linear dynamic MEC (ND-MEC) method is proposed. The accuracy of the ND-MEC method is comparable to that of FEA which is achieved by accounting for non-linear effects and dynamic changes in the magnetic flux distribution using a novel stray path elliptical function. Furthermore, the applicability of the ND-MEC is extended to the time domain by combining it with the time difference method (TDM). The complete method, referred to as the non-linear transient path energy method (NT-PEM), combines the ND-MEC, TDM, and a path energy method for the calculation of electromagnetic forces. The validity of the NT-PEM is verified by comparing it with 3D FEA and experimental results obtained from a PM-type MC prototype. The NT-PEM is a fast and inexpensive alternative to FEA, which is particularly advantageous when many designs must be analyzed and optimized while reducing analysis costs. The proposed method can also be applied to the analysis of emerging technologies dealing with multiphysics coupled problems, as in the case of smart materials.INDEX TERMS Magnetic contactor, magnetic equivalent circuit (MEC), nonlinear dynamics, permanent magnets, stray flux modeling.

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Section: ) the Proposed Force Calculation Methods Based On Change In Path Energymentioning

confidence: 99%

Novel Non-Linear Transient Path Energy Method for the Analytical Analysis of the Non-Periodic and Non-Linear Dynamics of Electrical Machines in the Time Domain

Gabdullin

2019

IEEE Access

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“…However, the air-gap magnetic field of PMSM is difficult to adjust due to the inherent properties of PM [3]. Thus, it is difficult for the motor to achieve high-speed constant power operation [4]. To extend the operating speed range, the machine usually injects a large d-axis current id to weaken the air-gap magnetic field [5].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Variable Leakage Flux Flux-Intensifying Motor for Improve Flux-Weakening Ability

Liu¹,

Guo²,

Zhu³

et al. 2021

PIER M

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This paper presents a novel variable leakage flux flux-intensifying motor (VLF-FIM) to improve flux-weakening ability. The innovation lies in the variable leakage flux property and the characteristic of L d > L q . The two characteristics can be achieved by the adoption of magnetic barriers and magnetic bridges. Consequently, the flux-weakening ability is enhanced. Then, the topology structure and operation principle of the proposed machine are introduced. Based on the two-dimensional finite element method (2DFEM), the performances of the proposed motor are analyzed and compared with the conventional interior permanent magnet motor (CIPMM) in detail. The performances mainly include torque, flux-weakening ability, constant power speed range (CPSR), irreversible demagnetization risk of the PM, structural strength, etc. Finally, the results show that the proposed motor has some advantages, such as good flux-weakening ability, a wide constant power range, and a large high-efficiency area. In addition, it verifies the effectiveness of the proposed method in improving the flux-weakening ability of the motor.

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“…One of the major problems in using market available non‐rare earth PM such as ferrite and Alnico in high‐torque applications is their low coercivity, which makes them easily demagnetised even under q current [17, 19]. So, careful optimisation with special attention to demagnetisation is required [6, 8–11].…”

Section: Introductionmentioning

confidence: 99%

“…So, careful optimisation with special attention to demagnetisation is required [6, 8–11]. Increasing the magnet length along the magnetisation direction [6, 9, 17] and incorporating non‐magnetic flux barrier along the armature q ‐axis flux paths [18, 19–21] help to decrease the load current demagnetisation effect. However, the improvement of these measures is limited due to the rotor space constraints in conventional machines.…”

Section: Introductionmentioning

confidence: 99%

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Design and analysis of a kind of rotor ironless high torque density machine using Alnico magnet

Sheng

Wang

2020

IET Electric Power Applications

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Conventional non‐rare‐earth permanent magnet (PM) electrical machine can hardly achieve comparable performance with the neodymium iron boron (NdFeB) machine due to the low coercivity and remanence. To solve this problem, a new kind of electrical machine using only Alnico magnet is proposed in this study. The novel rotor topology eliminates rotor iron core, and thus effectively limits armature reaction and improves torque density. A kind of rapid assessment method for the demagnetisation effect of q current in different slot–pole combinations through magnetomotive force and winding factor is presented and verified by 2D finite‐element analysis. The optimisation of critical dimensions is demonstrated, and the trade‐off between high PM utilisation and low demagnetisation effect is emphasised. After that, the good torque–current linearity and robust to demagnetisation characteristics of the proposed topology are proved through a comparison with two rare‐earth‐free machines. Finally, the performance comparison with a manufactured conventional NdFeB machine under the same volume constraints is provided. The result suggests that the proposed machine has a higher power factor, lower eddy‐current loss, and rare‐earth PM machine comparable torque density.

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Analysis and Design of SPM Type Variable Flux Memory Motor Considering Demagnetization Characteristic of Permanent Magnet

Cited by 7 publications

References 8 publications

Novel Non-Linear Transient Path Energy Method for the Analytical Analysis of the Non-Periodic and Non-Linear Dynamics of Electrical Machines in the Time Domain

Novel Non-Linear Transient Path Energy Method for the Analytical Analysis of the Non-Periodic and Non-Linear Dynamics of Electrical Machines in the Time Domain

Design and Analysis of Variable Leakage Flux Flux-Intensifying Motor for Improve Flux-Weakening Ability

Design and analysis of a kind of rotor ironless high torque density machine using Alnico magnet

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