关键词: 永磁直流电机, 阶次分析, 低频振动, 低频噪声, NVH分析

Abstract: The low-frequency (20~200 Hz) vibration and noise sources of a type of air pump motor applied on automobile seat were analyzed. The first order of vibration and noise corresponding to the main frequency was confirmed through the order analysis. The methods of simulation analysis and test verification were used to reduce the vibration and noise values of the motor in the low-frequency band to meet the design requirements. The results show that for rotor dynamic unbalance, reasonable control of dynamic unbalance amount is beneficial to reduce the low-frequency vibration and noise level. In terms of rotor air gap eccentricity, with the increase of air gap eccentricity, the radial unbalanced magnetic pull will be more obvious. The smaller air eccentricity is of great help to the improvement of low-frequency vibration and noise of the motor. The results of the study and verification provide effective theoretical support and experimental basis for the improvement of low-frequency NVH performance of similar motors.

Key words: permanent magnet DC motor, order analysis, low-frequency vibration, low-frequency noise, NVH analysis