摘要
通过对降噪原理的分析,结合现代信号处理技术,提出了一种随机开关频率技术与空间电压矢量调制相结合的降噪方案,使得原先集中在载频和二倍载频附近的谐波噪声频谱展宽,虽然谐波的能量并没有减小,但谐波幅值得以降低,从而达到降噪的目的。通过仿真确定合适的随机数概率分布模式,在此基础上完成了低噪声变频控制器的设计与实现。通过实验波形可以看出,谐波噪声频谱得到明显展宽,噪声强度明显下降,达到了预期的目的。
Based analysis the principle of noise, combined with modem signal processing techniques, a noise reduction scheme that combine a random switching frequency technology with space voltage vector modulation had been put forward, which made the harmonic noise spectrum that previously concentrates on carrier frequency and twice carrier frequency wider. Though the harmonic energy was not reduced, harmonic amplitude could be reduced, thus the purpose of noise reduction was achieved. And through software simulation, an appropriate probability distribution model of random number was determined. Based on this, a low-noise frequency conversion controller had been designed and realized. The on-line debugging of the current system had been completed, experimental waveforms showed harmonic noise spectrum had been markedly widend, and noise intensity had decreased, achieving th.e expected goal.
出处
《微电机》
北大核心
2008年第8期52-54,共3页
Micromotors
基金
西北工业大学2007年本科毕业设计重点扶持项目
