微特电机控制器的电磁兼容改善设计

微特电机广泛应用在日常生活设备和工业驱动系统中,各国对电子设备提出了相应的电磁兼容标准。针对一款出口欧洲的微特电机系统,其传导干扰、辐射干扰均超过欧洲EN55032标准,在安装尺寸固定条件下,根据电机的控制原理和结构,对其进行了传导干扰、辐射干扰改善设计。从理论上分析控制器的电磁干扰和耦合途径,通过傅里叶变换分类出共模电流和差模电流的成分,采用调整驱动电阻和开关频率、增加RC吸收电路来削弱干扰源,通过接地滤波来抑制传播途径2种方法来降低电磁干扰。试验结果显示,加滤波电路可以降低传导干扰,加RC吸收电路可以降低辐射干扰。

Electromagnetic Compatibility Improvement Design of Micro Motor Controller

Micro motors are widely used in daily life equipment and industrial drive systems. Various countries have proposed corresponding electromagnetic compatibility standards for electronic equipment. The conducted interference and radiated interference of a micro motor system exported to Europe exceed the EN55032 standard. According to the control principle and structure of the motor, it is re-designed to improve the conducted interference and radiated interference under the condition of fixed installation size. The electromagnetic interference source and propagation path of the controller are theoretically analyzed. The components of common mode current and differential mode current are classified by Fourier transform. The interference source is weakened by adjusting the driving resistance and switching frequency and adding the RC absorption circuit, and the propagation of electromagnetic interference is suppressed through ground filtering, so that the electromagnetic interference is reduced. Experimental results show that adding filter circuit can reduce conducted interference, and adding RC absorption circuit can reduce radiated interference.