Method for acquisition of equivalent material parameters considering orthotropy of stator core and windings in SRM

Hu, Shenglong; Zuo, Shuguang; Liu, Mingtian; Wu, Hui-Ping

doi:10.1049/iet-epa.2018.5323

Cited by 9 publications

(5 citation statements)

References 20 publications

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“…An approach presented in [15] involves correcting the equivalent material parameters of the stator, resulting in a relatively accurate natural frequency prediction with a relative error of less than 3%. Similarly, in [16], material parameters of the stator and windings were determined through modal experiments on stator components. These parameters were then incorporated into the FE model of the entire machine, resulting in modal analysis results with a relative error within 5%.…”

Section: Figure 2 Flow Chart For the Electromagnetic Vibrationmentioning

confidence: 99%

Elastic Modulus Adjustment Method of Double-Stator HTS Field Modulated Machine Based on Entire Machine Modal Analysis

Wang,

Song,

Zhang

et al. 2024

IEEE Access

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The double stator high-temperature superconducting field modulated ( DS-HTS-FM ) machine with a dual-stator configuration and high-temperature superconducting materials includes numerous cryogenic components that establish the required operating temperature for superconducting magnets. This abundance of cryogenic elements introduces complexity to the process of conducting a modal analysis of the entire machine. However, the conventional trial-and-error approach employed to achieve precise modal analysis results for the entire-machine suffers from the drawback of lacking a clear direction for adjustment elastic modulus which has a great influence on the modal analysis results. Therefore, it is difficult to obtain accurate modal analysis results of the entire-machine. In response to this challenge, this study focuses on a 10 kW DS-HTS-FM machine as its subject and presents an elastic modulus adjustment method based on the entire-machine modal analysis, aiming to obtain accurate finite element (FE) modal analysis results of the entire-machine. Initially, the FE method is used to find the components that have a great influence on the outer stator modals while the components that have less influence on the outer stator modal are equivalent to the front and rear end cover in the form of additional mass, thus establishing an entire-machine equivalent model for elastic modulus adjustment. Subsequently, an examination is conducted to ascertain the relative impact proportions of the elastic modulus associated with the outer stator, casing, end cover, and armature windings on the natural frequencies of the outer stator, which can lead to a precise determination of the optimal direction for adjusting the elastic modulus parameters. Lastly, based on the entire-machine modal experiment, the elastic modulus of the equivalent model is modified in a definite direction. Consequently, the elastic modulus values for various components of the DS-HTS-FM machine can be accurately identified. Experimental outcomes affirm the efficacy of this approach in attaining precise FE modal results for the DS-HTS-FM machine and reducing the computational time required for FE analysis.INDEX TERMS Double-stator HTS field-modulated machine, whole-machine equivalent model, elastic modulus, modal experiment.

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Section: Figure 2 Flow Chart For the Electromagnetic Vibrationmentioning

confidence: 99%

Elastic Modulus Adjustment Method of Double-Stator HTS Field Modulated Machine Based on Entire Machine Modal Analysis

Wang,

Song,

Zhang

et al. 2024

IEEE Access

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“…As mentioned in refs. [11,20,29], the inner slot windings can be regarded as a whole; the end windings can be equivalent to a concentric ring, the inner diameter of which remains the same as that of the stator; the total axial length keeps unchanged, as shown in Figure 7. The assembly of the stator core and equivalent windings is shown in Figure 8.…”

Section: Correlation Quantity With Materials Parameter Materials Para...mentioning

confidence: 99%

“…Note that isotropic material parameters are easily and accurately obtained, such as those of the enclosure and end covers. In contrast, it is difficult to calculate the orthotropic material parameters, such as stator core, which is not a continuous elastomer due to lamination [11]. However, many existing studies consider the stator core as isotropic [12,13], but this method ignores the problem of axial stiffness reduction and may lead to a noticeable discrepancy between the calculated results and the actual results.…”

Section: Introductionmentioning

confidence: 99%

Method for acquisition of orthotropic material parameters and calculation of modal frequencies in permanent magnet synchronous motor

Xie

Cai

et al. 2023

IET Electric Power Appl

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This article presents a novel method for fastly obtaining orthotropic material parameters in permanent magnet synchronous motor. First, a theoretical model of the equivalent single cylindrical shell is introduced with three orthotropic material parameters by considering the orthotropic characteristics of the motor. Then, the relationship of three orthotropic material parameters and the axial mode order m, the radial mode order n and modal frequency f is established. On this basis, an analytical method with m = 0 is proposed to acquire three values, and its adaptability is pointed out. Meanwhile, based on the above obtained orthotropic material parameters, the calculation method of modal frequencies is presented. Finally, the modal test and finite‐element method are implemented to verify the rationality of the proposed method.

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“…Switched reluctance machines (SRMs) have gained increasing attention over the past decades thanks to their free of rare‐earth feature, robust structure, wide speed range, high starting torque, low maintenance cost, and great fault ride‐through capability [1–4]. A number of applications have been achieved in the aerospace, hybrid electric vehicle, and industrial production [5], which demonstrates broad acceptance and good practicability of SRMs.…”

Section: Introductionmentioning

confidence: 99%

Investigation of rotor strength and rotor dynamics for high‐speed high‐power switched reluctance machines

Gan

Chen

Cui

et al. 2020

IET Electric Power Applications

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This study proposes an investigation scheme of the rotor strength and rotor dynamic characteristics for high‐speed high‐power switched reluctance machines (SRMs). The analytical model and finite element analysis model are established to predict the maximum stress and deformation in the rotor. The Mises yield criterion is employed to verify the strength of the rotor at 1.2 times the rated speed. For the rotor dynamics, critical speed, unbalance response, and stability of the shaft system are analysed in detail. In the developed critical speed calculation scheme, the gyroscopic effect and the impact of the rotation speed on the stiffness and damping are considered. Then, the critical speeds acquired by the developed scheme are compared with those derived by using the conventional method. The unbalance response curves at different nodes are adopted for the unbalance response calculation, while the stability of the shaft system is verified by calculating the logarithmic decrement rates. The critical speed measurement experiment is performed on a 160 kW and 18,000 r/min SRM prototype, and the proposed critical speed calculation scheme is proved to be effective and accurate. The effectiveness of the unbalance response calculation method and the stability judgement technique are also verified by experiment.

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Method for acquisition of equivalent material parameters considering orthotropy of stator core and windings in SRM

Cited by 9 publications

References 20 publications

Elastic Modulus Adjustment Method of Double-Stator HTS Field Modulated Machine Based on Entire Machine Modal Analysis

Elastic Modulus Adjustment Method of Double-Stator HTS Field Modulated Machine Based on Entire Machine Modal Analysis

Method for acquisition of orthotropic material parameters and calculation of modal frequencies in permanent magnet synchronous motor

Investigation of rotor strength and rotor dynamics for high‐speed high‐power switched reluctance machines

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