吸油烟机异音诊断分析及声音品质优化设计

针对“吸油烟机离心风机运转过程中因电网中谐波分量与电机磁场谐波相互作用,激发系统产生电磁异音和振动”的问题,提出了优化减振系统吸收异常声频能量,消除异音和振动的技术思路.采用辐射噪声频谱分析法并结合对电源谐波特性的对比测试,对异音和振动的发生机理进行了分析,在明确了噪声线谱中对异音贡献最明显的特征频率及其特性后,通过对电机与蜗壳连接的减振垫结构的优化设计和效果评估,从而得到了较优的结构方案.研究结果表明,通过在电机减振垫上设置微型“弹性单元”阵列,可有效衰减声辐射线谱200 Hz处的能量,使声音品质和整机运转时的振动得到显著改善.

Diagnostic analysis of electromagnetic noise and optimal design to improve the sound quality of range hood

Aiming at the abnormal electromagnetic noise and vibration occurred when the motor of the range hood＇s fan operated,which caused by interaction of the harmonic voltage in power grid and magnetic field of the motor,a technical approach about the vibration energy absorption system optimization design was presented to eliminate the abnormal noise and vibration.The radiation noise frequency spectrum analysis and power harmonic characteristic were adopted to analyze the mechanism of noise and vibration.Through the test,the most obvious characteristic line spectrum frequency was found.Different damping pad structure between the motor and volute were evaluated,and the best structure scheme was produced.The experimental results show that the new motor damping pad with micro-elastic units array could reduce the line spectrum of 200 Hz effectively,the sound quality and the whole machine vibration problem is improved significantly.