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The research status of magnetizing model of TA core is analyzed and summarized. Five kinds of magnetizing models are illustrated briefly. Magnetizing model of solid core based on Jiles-Atherton theory is deeply analyzed. And the simulation of dynamic hysteresis loop is realized. Combined with the related theoretical derivation of air gapped core, the magnetizing model based on Jiles-Atherton theory...
This article introduce a system based on neutral nekwork. It can estimate the limit temperature rise time of the asynchronous motor. The system avoids the defects of existing motor thermal overload protection methods. Use amount of data to verify the intelligent system can estimate the time from start status to limit temperature status.
The importance of motor overload protection, national standards for motor protection requirements and the way to achieve motor overload protections is briefly introduced. The existing motor overload protection algorithm is analyzed, the improvement algorithm as well as it realization way is proposed.
Based on the complex fire reason analysis of metro vehicle, aiming at on-board high power devices of metro vehicle, e.g. , traction motor, the temperature state model of its surface and other related position is a most important index, which can reflects devices running normally or abnormally. Because there are lots of factors influencing or reflecting device temperature state model and neural network...
Body temperature state pattern is the most important index, which can reflect normal and abnormal running state of the high power loading devices for the vehicle on subway, in order to timely, quickly and accurately recognize body temperature state of the objective device, and reduce false alarming probability, make use of neural network system intelligent Agent and expert system intelligent Agent...
This paper uses FTA (Fault Tree Analysis) with FMEA (Fault Mode Effect and Analysis) to do the study on reliability of low voltage apparatus. Establishing the fault tree is the most important step in using fault tree analysis. The validity of the tree model will have a great impact on the study result. The combination of the two analysis method can give a full-scale and detailed analysis of the product...
Power transmission voltage is higher than the rated voltage according to the standard, in order to avoid the voltage drop because of the power loss and the overload. However when the load in the power network is light, the excessively high electrical network voltage may cause the load equipment to give off heat, and reduce service life. At the same time the power consumption and electrical bill disbursement...
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