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135 results on '"Cao, Ruiwu"'

2. Open-Circuit Fault Diagnosis for Dual Three-Phase Permanent Magnet Machine Considering Nonideal Condition

Author

Guo, Lingling, Wang, K., Wang, Tao, Cao, Ruiwu, and Li, Feng

Abstract

Nonideal currents, such as unbalanced current and nonsinusoidal current, greatly challenge the open-circuit fault diagnosis by increasing the risk of false alarms. In this article, an open-circuit fault diagnostic method based on vector space decomposition transformation is proposed for surface-mounted dual three-phase permanent magnet machine drives, which is simple, fast, and most importantly, robust to nonideal currents. The proposed method divides per-phase current into direct-axis and residual components, and then, the ratio of both can be utilized for open-circuit fault detection and identification, including open-switch and open-phase faults, which are relatively simple to implement. Benefited from universal id = 0 control, the proposed fault index remains at zero under healthy condition and is not influenced by machine parameter, operation conditions, and nonideal cases, thus reducing the risk of false alarms. Moreover, the natural robustness allows a low security margin for fast diagnostic speed. Experimental results verify the robustness and effectiveness of the proposed method.

Published
2024
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35. Segmented power supply control of double‐sided linear flux‐switching permanent magnet motor.

Author

Cao, Ruiwu, Zhang, Zheng, Lu, Minghang, and Jiang, Ning

Abstract

Current research shows that the double‐sided linear flux‐switching permanent magnet (DLFSPM) motor is suitable for electromagnetic launch systems, in which the armature windings and permanent magnets are set on the long primary stator, whereas the mover is only composed of yokeless iron. Thus, the DLFSPM motor incorporates the merits of high power density and efficiency of the linear permanent magnet synchronous motor and simple and robust structure of linear induction motor. To improve the power factor and decrease the inverter capacity, the segmented power supply control methods of the DLFSPM motor are investigated in this study. First, the structure, electromagnetic parameters, and the segmented power supply method of the DLFSPM motor are explored. Then, the mathematical models and the control strategies of the DLFSPM motor are deduced and proposed. Finally, the simulations and experiments of the DLFSPM motor are conducted to validate the study of segmented power supply method. [ABSTRACT FROM AUTHOR]

Published
2020
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36. Investigation of linear synchronous reluctance motor for urban rail transit.

Author

Cao, Ruiwu, Su, Enchao, Lu, Minghang, Si, Jikai, and Wang, Kai

Abstract

The long stator of linear synchronous reluctance motor (LSynRM) consists only of low‐cost permeable material. Hence, LSynRM has a good application prospect in long‐distance drive systems. What about the electromagnetic performance of LSynRM under the constraints of installation size of rail transit? What are the advantages of LSynRM compared with the existing linear induction motor (LIM)? Research is non‐existent in academic circles. The purpose of this study is to compare LSynRM with LIM used in rail transit and give a comprehensive evaluation. First, a LIM used in Guangzhou Metro was analysed. Second, the working principle of LSynRM was analysed, and the selection principles of key parameters were determined. On this basis, the relevant parameters were optimized by using two‐dimensional finite‐element analysis (FEA) software. Then, the output characteristics of LIM and LSynRM were compared. The influence of ferrite on LSynRM was explored in view of the low power factor. The influence of winding end effect is explored through three‐dimensional FEA. The thrust force and power factor of LSynRM are corrected and the model is adjusted. Finally, the system cost and energy consumption of the two motors based on Guangzhou Metro Line 4 were estimated and compared in detail. [ABSTRACT FROM AUTHOR]

Published
2020
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