Detection method of inter-turn pressure during hot-press forming process of centripetal magnetic pole coil of hydro-generator

Abstract

The invention relates to a detection method for detecting the inter-turn pressure of the centripetal magnetic pole coil of a hydro-generator during in hot-pressing modeling process. According to the method, high-temperature thin film pressure sensors pre-buried in the inter-turn insulations of a first centripetal magnetic pole coil during a trial manufacture process are adopted to directly detectthe magnitude and distribution of the inter-turn pressure of the centripetal magnetic pole coil during the pressing of a oil press for hot-pressing modeling; and when it is monitored that the distribution of the inter-turn pressure is uniform, and the size of the magnetic pole coil reaches a designed value, the corresponding pressure value of the oil press is recorded, and the pressure value can be adopted as a pressure process parameter for subsequent mass production. The method of the invention has the advantages of high reliability and accurate measurement result. With the detection methodadopted, the dynamic monitoring of the inter-turn pressure of the magnetic pole coil in a whole pressing process can be realized, the important process parameter, that is the pressure value of the pressing of the oil press in the modeling manufacturing process of the centripetal magnetic pole coil can be accurately obtained; and the problem of inter-turn separation of a hot-pressed centripetal magnetic pole coil which is caucused by the large error of a pressure value of the pressing of an oil press which is determined according to theoretical calculation and empirical values in the prior artcan be solved.

Description

technical field [0001] The invention relates to a method for detecting the inter-turn pressure during the hot-press forming process of centripetal magnetic pole coils of a hydroelectric generator. Background technique [0002] With the needs of the development of the electric power industry, hydro-generator sets are developing towards high speed and large capacity, especially pumped storage units and impact-type units, with higher speeds, which poses a challenge for the design and manufacture of magnetic pole coils of hydro-generators. higher requirement. At present, high-speed hydro-generator sets generally adopt a tower-shaped centripetal magnetic pole coil design structure, which has many advantages such as improving the lateral force component of the coil and inter-pole ventilation. However, due to the gradual increase of the capacity of the unit, the structural size of the magnetic pole coil also increases accordingly, which makes the manufacturing process of the centr...

AI Technical Summary

Problems solved by technology

At present, this parameter is only determined based on theoretical calculations and empirical values, which undoubtedly brings more uncontrollability to the quality of centripetal magnetic pole coil thermocompression forming

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