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Hub motor air gap eccentricity leads to electromagnetic force imbalance and torque fluctuation increase affecting the vehicle driving stability. To solve this problem, firstly, the Fourier function was used to derive the relationship curves of inductance, magnetic chain, radial electromagnetic force and torque of the switched reluctance motor concerning the current and angle, and then, the spatial electromagnetic characteristics of the electromagnetic force and torque were analyzed based on Maxwell’s stress tensor method in the two operating conditions. The results show that the air gap eccentricity leads to the imbalance of electromagnetic force and torque at the eccentric position. Then, the contribution weights of structural parameters were determined by sensitivity analysis, and a multi-objective optimization scheme was formulated, finally, the multi-objective optimization search of structural parameters was carried out with the help of NSGA-Ⅱ, and two groups of optimization schemes were screened, of which the optimal scheme C1 improves the optimization results greatly, and the longitudinal and transverse stability of the wheel-hub motor-driven automobile is improved efficiently.
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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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