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To investigate the influence of SiC inverter characteristics on the voltage distribution in traction motor windings, this paper first proposed an equivalent circuit model for the high-frequency distributed parameters of motor windings that accounted for the proximity capacitance effect of the conductor. Subsequently, the voltage stress distribution characteristics of the winding under single-phase and three-phase pulse output from the SiC inverter were analyzed, and the correctness of the model analysis results was verified using an experimental test platform. Finally, the effects of the switching frequency, dv/dt, and grounding method of the SiC inverter on the winding voltage stress distribution were analyzed. The results show that under single-phase pulse operation, the maximum voltage stress to ground of the windings occurs on the winding near the inverter of the other two phases. Under three-phase pulse operation, the maximum voltage stress to ground appears on the middle-position winding of the respective phase. The switching frequency does not affect the maximum values of either the voltage stress to ground or the interturn voltage stress of the winding. The dv/dt significantly affects the interturn voltage stress distribution, when dv/dt increases from 2.0 kV/μs to 15.0 kV/μs, the maximum interturn voltage stress increases by about three times. Different grounding methods have a considerable influence on the voltage stress to ground distribution of winding, and the minimum voltage stress to ground is achieved when a 1/2 grounding system is adopted.
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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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