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To extremely improve high power density of a disc type permanent magnet synchronous motor (PMSM), the results are simulated with finite element method considering the electromagnetic, fluid and thermal. Motor output power and temperature rise with different water are calculated by flow analysis. The rationality of thermal conductivities of materials are proved by comparing the calculated results with...
Moisture has strong influence on insulation performance of oil pressboard system in power transformer. Moisture in oil immersed pressboard is uniform under constant temperature condition. Moisture in pressboard can be calculated according Oommen paper oil equilibrium curves. Temperature of power transformer is related to the atmospheric temperature and the load. If atmospheric temperature or load...
The space charge distributions of different ZnO varistors have been investigated using pulsed electro-acoustic (PEA) method in this paper. There were 8 kinds of ZnO varistors samples sintered under 4 different sintering temperatures with two formulas. According to the experimental results, it was found that there is space charge distribution when the sample is applied with a DC voltage, and the space...
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