Abstract
This paper studies an absolute positioning sensor for a high-speed maglev train and its fault diagnosis method. The absolute positioning sensor is an important sensor for the high-speed maglev train to accomplish its synchronous traction. It is used to calibrate the error of the relative positioning sensor which is used to provide the magnetic phase signal. On the basis of the analysis for the principle of the absolute positioning sensor, the paper describes the design of the sending and receiving coils and realizes the hardware and the software for the sensor. In order to enhance the reliability of the sensor, a support vector machine is used to recognize the fault characters, and the signal flow method is used to locate the faulty parts. The diagnosis information not only can be sent to an upper center control computer to evaluate the reliability of the sensors, but also can realize on-line diagnosis for debugging and the quick detection when the maglev train is off-line. The absolute positioning sensor we study has been used in the actual project.
Highlights
The high-speed maglev train moves without any contact with the tracks depending on the electromagnetic force levitation, and it is driven by a linear synchronous motor
Based on the reasons above, how to locate the faults of the sensor reliably for upper center control computer to make evaluations, and how to realize high efficiency detection for the sensor are new problems for us too. Aimed at solving these problems, this paper proposes an absolute positioning sensor and designs a system to realize the automatic fault diagnosis for the sensor
The experimental results show that this method can reliably accomplish the automatic fault diagnosis
Summary
The high-speed maglev train moves without any contact with the tracks depending on the electromagnetic force levitation, and it is driven by a linear synchronous motor. The absolute positioning sensor is working under conditions of high temperature, strong electromagnetic disturbance and high-speed horizontal movement Due to these factors, it is almost impossible for humans to perform the fault diagnosis for the sensors directly, especially while the train is running. Based on the reasons above, how to locate the faults of the sensor reliably for upper center control computer to make evaluations, and how to realize high efficiency detection for the sensor are new problems for us too. Aimed at solving these problems, this paper proposes an absolute positioning sensor and designs a system to realize the automatic fault diagnosis for the sensor. The experimental results show that this method can reliably accomplish the automatic fault diagnosis
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