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The use of silicon carbide (SiC) inverters for power supply can reduce the size, weight, and temperature rise of traction inverter motors and improve the motor efficiency. However, the high frequency and short rise time of the inverter output voltage would bring challenges to the insulation of traction inverter motors. The turn-to-turn insulation will be subjected to higher voltage loads, which will lead to premature insulation failure. In this paper, the voltage waveforms of turn-to-turn insulation of high-voltage inverter traction motor were firstly simulated when the SiC inverter is at the maximum switching frequency and the actual cable length. The partial discharge inception voltage (PDIV) test and endurance life test were conducted on the electromagnetic wire of high-voltage inverter motor under different voltage parameters (frequency, voltage level, rise time), different temperatures, and different thicknesses of turn-to-turn insulation (0.23 mm, 0.30 mm). Then according to the actual operating conditions of traction motor and the electrical load failure mechanism of insulation system, the change mechanism of PDIV, partial discharge characteristics, and life was analyzed. The PDIV test results show that the change of frequency and rise time has no influence on the PDIV. The PDIV derceases with the increase of temperature. However, due to the fabrication process, the PDIV increases at some temperatures. The increase in thickness has a greater increase in PDIV. Under the premise of controllable cost and efficiency, increasing the thickness can effectively improve the turn-to-turn insulation performance of inverter motors. Endurance test results show that the changes in temperature and rise time would cause large changes in insulation life. The effect of frequency and voltage level on insulation life is non-linear, and it can be expressed by the inverse power model. In industrial applications, the effect of frequency on the insulation life can be directly converted through a proportional relationship.
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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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