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In this paper, the influence laws of radial and axial dimensions of air gap on the internal electric field of motor insulation were studied by constructing the insulation structure and its internal air gap model. The quantitative relationship between the change of air gap size and electric field were revealed, and the mathematical model was established based on the air gap size parameters. At the same time, to simulate the air gap generated in actual operation, the cold-hot shock cycling test was conducted on models. By comparing the changes of partial discharge inception voltage (PDIV), dielectric loss factor, and electrothermal ageing life of the model before and after the test, the effect of the air gap on long-term reliability of the insulation structure was comprehensively evaluated. The results show that when the axial dimension of air gap is constant, the gap electric field decreases exponentially with the increase of the radial dimension of air gap. When the radial dimension of the air gap is constant, the air gap electric field increases exponentially with the increase of the axial dimension of air gap. As the cycle period of cold-hot shock increases, the overall PDIV of the model shows a downward trend, while the dielectric loss factor shows an upward trend. The electrothermal ageing life of the samples before and after cold-hot shock cycleing test are quite different, the ageing life of the sample after 10 cycles of cold-hot shock is only about 1/30 of that of the control sample.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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