Full
Outline
Silicon carbide devices with multi-chip parallel structure are widely used in motor controllers for new energy vehicles in high frequency and high power density applications. The motor controller is a highly coupled electromagnetic-thermal system. The imbalance of chip temperature and stray inductance in the multi-chip parallel structure aggravates the complexity of the coupling system. In order to reveal the deep coupling mechanism of electromagnetic-thermal and the variation law of electromagnetic-thermal domain in the motor controller, multi-physical field coupling analysis under multi-parallel structure is needed. A multi-physical field coupling analysis method based on parameter transfer is proposed. First, the stray inductance model of chip parallel branch at different temperatures is established by magnetic-thermal coupling analysis. Then, through the electro-thermal coupling analysis, the simulation model of silicon carbide chip losses under different temperatures and stray inductance is established. Finally, loss parameter transfer is used to simulate the temperature of the controller under fluid-solid coupling, and the stray inductance model and loss model at this temperature are updated in real time. The electromagnetic-thermal coupling parameters of the chips under the multi-chip parallel structure during the temperature rise of the controller are studied. The accuracy of the multi-physics coupling analysis method is verified by the temperature rise experiment.
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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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