无人机17KW电机振动噪声分析与巡航转速下尖端噪声优化

doi:10.19595/j.cnki.1000-6753.tces.231228

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Abstract

In the field of unmanned aerial vehicle(UAV) noise, extensive research on propeller noise generation mechanisms and suppression methods has achieved remarkable results. Therefore, the noise radiated by UAV motors has become a new research focus.
The study addresses a 17KW UAV with a surface-mounted external rotor permanent magnet synchronous motor. There are more studies on electromagnetic vibration suppression methods for permanent magnet synchronous motors, and some methods may reduce the motor output torque or increase the manufacturing complexity at the same time. Therefore, the article proposes a method to optimize the pole and stator slotting parameters to improve the motor vibration noise without reducing the output torque.
Since radial air-gap flux density and radial electromagnetic force are the causes of motor vibration noise, the space harmonic characteristics of radial air-gap flux density of this motor are analyzed in detail based on the theory and the effects of magnetic pole and stator slotting parameters on the amplitude of low-order radial air-gap flux density are explored. And the rotor modal simulation of the motor is carried out in order to investigate the mechanism of the radial electromagnetic force and the motor space modes.
Then, the electromagnetic vibration noise characteristics of the motor at multiple speeds are investigated, focusing on calculating the vibration noise of the motor at a cruising speed of 1880 rpm. Taking the average torque, torque pulsation and flux density fundamental wave amplitude as the constraints, a multi-objective optimization mathematical model is established and solved by using a hybrid particle swarm optimization algorithm. Three alternatives were selected among the many solutions for solving the problem.
The simulations of the alternatives are compared, and finally Scheme 1 is selected as the optimization scheme. The simulation shows that the amplitude of the 3rd and 5th order components of the radial air gap magnetization of Scheme 1 is decreased by 45.57% and 60.92% compared with the original scheme. The magnitude of the radial electromagnetic force decreases by 5.88% in the 0th order, 33.03% in the 2nd order, and 6.81% in the 4th order. And the torque fluctuation of scheme I decreases by 32% when the average torque is basically unchanged.
Finally, the experimental results show that after the structure optimization, the electromagnetic vibration tip noise at the cruising speed of the motor is reduced by 6.37 dB from the initial 71.62 dB to 65.25 dB, and the overall performance of the motor vibration noise is also improved at multiple speeds. It is verified that the optimized structure has a significant suppression effect on the UAV motor tip vibration noise at cruising speed.
In addition, the average torque is 88.43N·m for the original scheme and 88.55N·m for the optimized scheme, and the average torque is almost constant. The torque pulsation in the experiment was 3.30%; the torque fluctuation of the optimized scheme was 2.16%. The overall decrease in torque fluctuation is 34.5%. It can be seen that the structure is optimized to reduce the tip noise of the motor and also optimize the torque pulsation.

Key words： UAV outer rotor permanent magnet synchronous motor Electromagnetic vibration noise Cruise speed Hybrid particle swarm optimization algorithm

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TM351

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	Liu Dongliang
	Zhan Chenggen
	Qu Feng
	Chen Lijun
	Shi Heng

Cite this article:

Liu Dongliang,Zhan Chenggen,Qu Feng等. Vibration Noise Analysis and Tip Noise Optimization of UAV 17KW Motor at Cruise Speed[J]. Transactions of China Electrotechnical Society, 0, (): 1228-1228.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.231228 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/1228

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