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In order to study the influence of the relative dielectric constant of motor insulation structure on the electric field distribution at different frequencies, this article took the relative dielectric constant of a main insulation structure at different frequencies as a variable to calculate its influence on the electric field distribution of the main insulation sandwich structure in the slot and the notch. At the same time, the optimization measures for the electric field of slot were analyzed. The results show that in the sandwich structure of main insulaton, because the film has a lower dielectric constant, it bears a larger electric field than mica tape. When the relative dielectric constant of the air at the notch is constant, the electric field strength of the air at the notch decreases slightly with the decrease of the relative dielectric constant of the main insulation. The insulating paint in the small gap at the chamfer of the notch iron core can reduce the electric field strength of air; without insulatin paint, the small gap generated by chamfer can produce a larger electric field strength of air. Vacuum potting of the notch can effectively reduce the electric field strength of air at the notch.
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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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