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9 results on '"Yan, Xueyi"'

4. A Mathematical Model for Wound Field Switched Flux Machine Considering Inductance Harmonics of Field and Armature Windings

Author

Yan, Xueyi, Wu, Zhongze, Hua, Wei, Zhang, Wentao, and Cheng, Ming

Abstract

A mathematical model of the wound field switched flux (WFSF) machine considering inductance harmonics is proposed in this paper, including harmonics of the DC winding self-inductance Lf, and those of mutual inductance Mfx (x = A, B, C) between x-phase armature winding and the DC winding, which can predict the DC winding induced voltage of the WFSF machine. The modelling method decouples differential terms did/dt, diq/dt and dif/dt of d-axis current id, q-axis current iq and DC winding current if in d-, q-axis voltage equations and the DC winding terminal voltage equation. The simulation of the control system with the proposed mathematical model is conducted and compared with the field-circuit coupling co-simulation to verify the proposed mathematical model, which shows its advantage of less time consumption. The proposed mathematical model is further compared with experiments, which validates the accuracy of the modelling method, as well as the capability to predict the DC winding induced voltage pulsation.

Published
2024
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6. Modified magnetic equivalent circuit of double‐stator single‐rotor axial flux permanent magnet machine considering stator radial‐end flux‐leakage.

Author

Chen, Jixuan, Hua, Wei, Shao, Lingyun, Wu, Zhongze, Yan, Xueyi, and Zhang, Wentao

Subjects
STATORS, MAGNETIC circuits, FINITE element method, ELECTROMOTIVE force, PERMANENT magnets, MACHINERY
Abstract

A modified non‐linear magnetic equivalent circuit (MEC) model is presented for double‐stator single‐rotor axial flux permanent magnet (AFPM) (DSSR‐AFPM) machine considering stator radial‐end flux‐leakage, which is severer under a heavier load. Compared to the conventional MEC model for DSSR‐AFPM machine, the proposed model can predict the electromagnetic performance more accurately when the machine operates under a heavy load. The proposed MEC model is verified by the finite element analysis (FEA) on a 24‐slot/20‐pole DSSR‐AFPM machine. The comparison results show that the relative error between the proposed MEC model and FEA is <4% for back electromotive force and <5% for average electromagnetic torque, respectively. Specifically, the relative error of the average torque for the modified MEC model is 4.92% at 28.30 Arms/mm2 slot current density, which is lower than the conventional MEC model, that is, 7.75%. [ABSTRACT FROM AUTHOR]

Published
2024
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9. Financial risk measurement based on CAPM - EGARCH model----VAR calculation

Author

Huang yumei and Yan xueyi

Subjects
Financial management, Actuarial science, business.industry, Carry (investment), Financial risk, Fixed price, Econometrics, Economics, Capital asset pricing model, Capital asset, business, Electronic mail, Data modeling
Abstract

This article has carried on the simple introduction to the VAR meaning and the computational method, uses CAPM (capital asset fixed price model) to carry on the modeling to the financial property repayment, carries on the fitting using the EGARCH model to the financial property repayment undulatory property, has established the financial property risk value model. The real diagnosis analysis explanation that this model can fit the financial property accurately of the repayment process.

Published
2010

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