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To weaken the vibration and noise of automotive synchronous motors, this paper proposes a combined rotor slotting design scheme and electromagnetic noise forward optimization design method. Firstly, the mechanism of electromagnetic vibration noise is explored, then based on Maxwell tensor method and finite element method, the time-space distribution characteristics of radial electromagnetic force wave are studied, and the main electromagnetic force harmonic components causing electromagnetic noise are determined. Secondly, an improved design scheme of combined rotor slotting is proposed, and the optimal solution of structural parameters of slotting scheme is determined by combining the optimal prediction meta-model and strength Pareto evolutionary algorithm. Finally, the electromagnetic simulation model of the motor is established, and its line back electromotive force, cogging torque and output torque are compared and evaluated. The results show that the rotor slotting design can effectively suppress the spatial 0-order 12f electromagnetic force harmonic amplitude, improve the back EMF waveform, reduce the cogging torque and torque ripple, and thus reduce the vibration noise. Compared with the original prototype, the harmonic amplitude of the 0-order 12f electromagnetic force is weakened by 81.51%, the torque ripple is reduced by 44.98%.
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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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