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355 results on '"Kou, Baoquan"'

9. Improved Analytical Model for the Magnetic Drag of a Dual-Conductor Plate Parallel Electric Suspension and Guiding Mechanism

Author

Huang, Changchuang, Kou, Baoquan, Zhao, Xiaokun, and Niu, Xu

Abstract

The Maglev launch assist system (MLAS) has been adopted as part of a reusable launch vehicle system to lower launch costs. In this article, a dual-conductor plate parallel electric suspension and guiding mechanism (DPESGM) serving the suspension and guidance function of the MLAS is proposed. First, the MLAS and the structure of the DPESGM are introduced. Then, a DPESGM magnetic drag analysis model is established based on the multilayer theory for the fast calculation of the magnetic drag. However, its accuracy is poor at high speed. To solve this problem, an improved analytical model suitable for the full speed range is developed, which takes the equivalent conductivity replacement approach to consider the skin effect. Finally, the improved analysis model is verified by the finite element method (FEM) and prototype experiments. The results show that the improved analytical model is highly accurate in the evaluation of the DPESGM magnetic drag from low speed to high speed. As the improved analytical model takes less computational time than 3D FEM, it is an efficient tool for the DPESGM magnetic drag calculations to complete the preliminary design of the propulsion and braking systems.

Published
2023
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13. Fluid Flow and Thermal Analysis of an Axial Flux Permanent Magnet Eddy Current Brake

Author

Pan Donghua, Li Liyi, Yinxi Jin, and Kou Baoquan

Subjects
Materials science, Convective heat transfer, Computer Networks and Communications, business.industry, Aerospace Engineering, Mechanics, Eddy current brake, Computational fluid dynamics, Physics::Fluid Dynamics, Magnet, Automotive Engineering, Thermal, Fluid dynamics, Astrophysics::Solar and Stellar Astrophysics, Torque, Electrical and Electronic Engineering, business, Thermal analysis, Physics::Atmospheric and Oceanic Physics
Abstract

With the increasing requirements for miniaturization and high braking torque, it is now necessary to analyze the thermal characteristics to the same extent as the electromagnetic design for eddy current brakes. However, due to the lack of suitable convection heat transfer correlations for axial flux eddy current brakes, it brings difficulties to designers. To solve this problem, the correlations for an axial flux permanent magnet (PM) eddy current brake are derived using the computational fluid dynamics (CFD) and the least square method. The proposed correlations considered the changes in design parameters and temperatures of the eddy current brake, and the accuracy is verified by the CFD. Subsequently, convective heat transfer coefficients calculated through the correlations are assigned to a thermal network model of the eddy current brake, and the thermal network model is verified by experimental tests. The results show that the thermal network model can accurately predict temperatures of the eddy current brake. Since the time required to calculate convective heat transfer coefficients through the correlations is significantly less than that required through CFD, and the variation of the geometrical parameters and temperatures can be considered, these correlations are very suitable for use in the optimization process.

Published
2022

14. Design and Analysis of a Stator Field Control Permanent Magnet Synchronous Starter–Generator System.

Author

Zhang, Haoquan, Kou, Baoquan, and Zhang, Lu

Subjects
*PERMANENT magnets, *PERMANENT magnet motors, *STATORS, *FINITE element method, *POWER density
Abstract

In recent years, the permanent magnet synchronous motor (PMSM) has garnered significant attention due to its high power density and efficiency in applications such as electric vehicles, aviation, and other domains. This paper proposes a stator field control permanent magnet synchronous starter–generator (SFC-PMSSG) system. The starter–generator system comprises the SFC-PMSSG and a field controller (FC). A mathematical model of the SFC-PMSSG is established. Finite element analysis (FEA) is employed to obtain the electromagnetic parameters of the SFC-PMSSG, and the characteristics of the SFC-PMSSG are analyzed. A circuit simulation model of the FC is established to assess the control effect and the loss of the FC. A co-analysis of the system is conducted, and the results demonstrate that the SFC-PMSSG system can maintain output voltage stability as load and speed conditions vary. [ABSTRACT FROM AUTHOR]

Published
2023
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25. Speed-based multiobjective optimisation of a cage-secondary permanent magnet linear eddy current brake.

Author

Chen, Wen, Kou, Baoquan, Wang, Mengyao, and Niu, Xv

Subjects
*PERMANENT magnets, *EDDIES, *BRAKE systems, *HIGH speed trains, *GENETIC algorithms, *GENE mapping
Abstract

This paper proposes a multiobjective optimisation scheme for a new cage-secondary permanent magnet linear eddy current brake, where the secondary is designed to own the cage configuration with variable parameters. This unique structure is suitable for applying to the high-speed rail transit braking system. Via speed-based multiobjective optimisation for this eddy current brake, the objectives of short braking distance, light weight, and low manufacturing cost can be achieved. First, the detailed structure and principle are described. Second, the braking force performance is accurately predicted by the proposed 3D analytical method. And the influence of secondary materials and secondary parameter values on braking force performance in all speed ranges is analysed. Third, the sensitivity of the optimisation design variables is analysed by the gene distribution maps. Then, the genetic algorithm based on the analytical model is used for multiobjective optimisation in all speed ranges and the best design scheme is selected. Finally, the accuracy of optimisation and the analytical model is verified by prototype experiment and simulation. [ABSTRACT FROM AUTHOR]

Published
2023
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48. A Reverse-Salient Permanent Magnet Synchronous Motor for Electric Vehicles Considering Operating Conditions

Author

Zhao, Xiaokun, Kou, Baoquan, Huang, Changchuang, and Zhang, Lu

Abstract

Permanent magnet synchronous motors (PMSMs) provide many attractive electromagnetic performances such as high torque density, high efficiency and simple structure, which make them more competitive in electric vehicles (EVs). However, designing a PMSM with a wide constant-power speed range and high power factor at high speeds is still full of challenges and requires further effort. In this paper, the performance of vehicle motors considering their operating conditions is analyzed. The design rules of the reverse-salient permanent magnet synchronous motor (RSPMSM) are summarized, and an RSPMSM is proposed. The principle of the RSPMSM with high torque especially in the flux-weakening states is studied by analyzing the variable flux leakage and variable saliency ratio in detail. The electromagnetic performance of the proposed RSPMSM is investigated using the finite element method (FEM), and its prototype is manufactured and tested. The experimental results show that the constant-power speed range is 5.5:1, and the power factor is close to 1 at high speed. Thus, the RSPMSM proposed in this paper is a favorable candidate for EVs.

Published
2023
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49. Research on typical topologies of a tubular horizontal-gap passive magnetic levitation vibration isolator

Author

Zhou Yiheng, Kou Baoquan, Yang Xiaobao, Luo Jun, and Zhang He

Subjects
Engineering (General). Civil engineering (General), TA1-2040
Abstract

Magnetic levitation vibration isolators have attracted more and more attention in the field of high-precision measuring and machining equipment. In this paper, we describe a tubular horizontal-gap passive magnetic levitation vibration isolator. Four typical topologies of the tubular horizontal-gap passive magnetic levitation vibration isolator are proposed. The analytical expression of magnetic force is derived. The relationship between levitation force, force density, force ripple and major structural parameters are analysed by finite element method, which is conductive to the design and optimization of the tubular horizontal-gap passive magnetic levitation vibration isolator. The force characteristics of different topologies of the tubular horizontal-gap passive magnetic levitation vibration isolator are compared and evaluated from the aspect of force density, force ripple and manufacturability. In comparison with conventional passive magnetic levitation vibration isolators, the proposed tubular horizontal-gap passive magnetic levitation vibration isolator shows advantage in higher force density.

Published
2017
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