有刷电机EMC整改策略实例：BDL+磁珠+电容，增加电容可提高余量
一、有刷电机原理
根据弗莱明左手定则，伸开左手，让磁感线穿入手心（手心对准N极，手背对准S极），四指指向电流方向，那么大拇指的方向就是导体受力方向：
由此推导电机工作时的受力作用方式如下：
S和N为永磁体，此时线圈在磁场中受力的作用沿顺时针方向转动，由于换向器的存在，在线圈转动180°后线圈的电流依旧是左边流入右边流出，线圈保持沿顺时针方向转动。当线圈和换向器变为两组，三组甚至更多之后，就是我们常见的有刷电机。所以，有刷电机的常见结构主要为：永磁体（定子）+线圈绕组（转子）+换向器+碳刷，如下图所示：
电流流向为：电源正极--碳刷--线圈绕组--碳刷--电源负极。
二、辐射产生原因
电机在工作过程中，换向器不停地转动，在这个过程中换向片与碳刷之间会不停地快速地摩擦，进而产生拉电弧现象，电弧产生高频噪声，高频噪声通过电机引线和电机缝隙向外辐射。
一般电机都有金属外壳，可以对电机内部通过空间辐射的噪声进行屏蔽和吸收，但是还有通过电机引线辐射出来的噪声，需要考虑对电机引线进行处理，例如在电机的结构中增加一块滤波小板，通过滤波小板将电机引线与外部引线隔离，减少电机辐射。
目前在很多电机上通过设置电感+电容的方式进行滤波处理，如下图所示：
其等效电路图为：
以上这种滤波方式考虑了差模噪声干扰，而忽视了电机引线存在的共模噪声干扰，存在辐射严重超标的不足。
电机辐射干扰通常需要同时考虑共模噪声和差模噪声，如下图电机共模和差模辐射模型所示：
如上图所示：回路1和回路2为共模噪声回路，其中C1，C2，C3为电路中的寄生电容，回路3为差模噪声回路。一般而言，回路面积越大，辐射越强，由图可知，共模噪声的回路面积远大于差模噪声回路。
综上，电机辐射包含共模噪声和差模噪声，其中共模噪声辐射能量更强。
三、整改策略
常见滤波电路：
方案一：共模电感+电感+电容
优点：共模电感可以针对共模噪声有效滤波，电容针对差模噪声，跟直流电机最近的电感L1和L2能有效抑制电机换向器的电磁火花；
缺点：共模滤波器和电感需要考虑器件的电流大小，而且封装一般都比较大，需要考虑空间成本。
方案二：BDL+磁珠
优点：可以同时滤除共模噪声和差模噪声，由于BDL的特点，滤波性能优于电容以及共模电感，滤波频段可以达到GHz，且具有较高的耐压值。
缺点：上图中的PE一般为电机金属外壳，滤波小板上除了电机引线外，需要有额外的地并与金属外壳连接，而且这两者的导通性的优劣对滤波效果有较大影响。
四、实例整改
以下是一款气泵的电机的设计实例，应用的方案是：BDL+磁珠+电容，增加电容可以提高余量：
整改前数据：
垂直方向
水平方向
整改后数据：
垂直方向
水平方向
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本文由出山转载自谱罗德官网，原文标题为:有刷电机EMC整改策略，本站所有转载文章系出于传递更多信息之目的，且明确注明来源，不希望被转载的媒体或个人可与我们联系，我们将立即进行删除处理。
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谱罗德电感选型表
提供谱罗德电感选型，包括非屏蔽功率电感、降噪电感、共模电感、贴片电感、贴片磁珠、一体成型电感、塑封电感,宽感值范围可选，可定制。感值范围0.1μH~30mH;抗阻值范围0~15000（Ω)。
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产品型号
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品类
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L值（uH、nH、mH)
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测试频率(KHz/MHz)
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公差精度%
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DCR(Ω/mΩ)
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温升电流(mA/A)
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饱和电流(mA/A)
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额定电流(mA/A)
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工作温度(℃)
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贴装方式
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封装大小(mm)
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PSPCAQ32-1R0M
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非屏蔽功率电感
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1.0μH
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100KH/0.25V
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±20%
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0.045Ω Max
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2200mA
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2200mA
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2200mA
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-25℃~105℃
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SMD
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3x3x2 mm
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选型表 - 谱罗德 立即选型
谱罗德滤波器选型表
提供谱罗德滤波器选型，包含EMI共模滤波器、宽频共模滤波器、共模线性滤波器、UU滤波器；耐压80v-150v, 额定电流100mA~6500Ma,DCR: 0.013Ω Max~5.2Ω Max
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产品型号
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品类
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L/Z
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测试频率
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公差精度
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DCR(Ω)
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额定电流(mA)
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耐压(V)
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工作温度
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贴装方式
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封装大小(mm)
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PSEFCI5025-101
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EMI共模滤波器
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100Ω
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100MHZ/0.1V
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Typ
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0.013Ω Max
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6500mA
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125 V
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-25℃~105℃
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SMD
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5x4x2.5 mm
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选型表 - 谱罗德 立即选型
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PSPM Series 一体成型电感制品规格书（PSPM Series SMD Molding Inductor SPECIFICATION FOR APPROVAL）
型号- PSPMAA0602H-2R2M-ANP,PSPMBL201610P-R33M-BM,PSPMAA0803H-330M-ANP,PSPMAC1770X-680M-IGP,PSPMAA0402-4R7M-ANP,PSPMAA0603-R33M-ANP/F,PSPMAA0518-2R2M-ANP,PSPMAA1040H-1R0M-ANP,PSPMBL201610P-R68M-BM,PSPMAA0412-R15M-ANP,PSPMAC1250H-220M-ANP,PSPMAA0610-100M-ANP,PSPMAA0618-R22M-ANP,PSPMAA0604H-330M-ANP,PSPMAA0518-3R3M-ANP,PSPMAQ1030-1R0M-ANP,PSPMAA0502-1R2M-ANP,PSPMAA063H-470M-ANP/F,PSPMAA0618-R82M-ANP,PSPMAA0624H-R68M-ANP/F,PSPMAA0412-4R7M-ANP,PSPMAA0803H-2R2M-ANP,PSPMAC1040X-8R2M-ANP/F,PSPMGD2213-1R5M-ANF,PSPMAC1250H-150M-ANP,PSPMAA0518-8R2M-ANP,PSPMAA0624H-2R2M-ANP/F,PSPMAA0602H-R10M-ANP,PSPMAM0805-1R5M-ISP,PSPMBL252010P-4R7M-BM,PSPMAA1040H-100M-ANP,PSPMAA1040H-R56M-ANP,PSPMAC1040X-R22M-ANP/F,PSPMAC1770X-150M-IGP,PSPMAC1265H-6R8M-ANP/F,PSPMAA0605H-330M-ANP,PSPMBL252010P-1R5M-BM,PSPMAA0502-5R6M-ANP,PSPMAA0502-100M-ANP,PSPMAC1040X-1R0M-ANP/F,PSPMAA0604H-2R2M-ANP,PSPMAA0518-1R5M-ANP,PSPMAA0502-1R0M-ANP,PSPMAA0604H-4R7M-ANP,PSPMAA1040H-6R8M-ANP,PSPMAC1265H-470M-ANP/F,PSPMBL252010P-R22M-BM,PSPMAA0605H-470M-ANP,PSPMAA0618-4R7M-ANP,PSPMAC1250H-470M-ANP,PSPMAC1770X-151M-CGP,PSPMAC1040X-R56M-ANP/F,PSPMAC1040X-6R8M-ANP/F,PSPMAC1770X-820M-IGP,PSPMAA0602H-R33M-ANP,PSPMAM0805-151M-ISP,PSPMAA0503-3R3M-ANP,PSPMAA0503-R47M-ANP,PSPMAC1770X-100M-CGP,PSPMAA0503-2R2M-ANP,PSPMAA0624H-150M-ANP/F,PSPMAA0624H-3R3M-ANP/F,PSPMAA0603-1R0M-ANP/F,PSPMBL252012P-1R5M-BM,PSPMAA1040H-150M-ANP,PSPMAM0805-330M-ISP,PSPMAM0805-1R0M-ISP,PSPMGD2213-3R0M-ANF,PSPMBL201610P-R24M-BM,PSPMAA0502-R22M-ANP,PSPMAM0805-560M-ISP,PSPMAA0518-4R7M-ANP,PSPMAA0502-6R8M-ANP,PSPMAC1770X-6R8M-IGP,PSPMAA0603-6R8M-ANP/F,PSPMBL201610P-2R2M-BM,PSPMAA0518-6R8M-ANP,PSPMAA0503-R33M-ANP,PSPMAA0803H-1R5M-ANP,PSPMAA0503-4R7M-ANP,PSPMAA0610-4R7M-ANP,PSPMAM0805-100M-ISP,PSPMAA0604H-3R3M-ANP,PSPMAA0518-R47M-ANP,PSPMAA04021R0-MANP,PSPMAA0402-R10M-ANP,PSPMGD2213-101M-ANF,PSPMAC1770X-4R7M-IGP,PSPMAA0604H-R47M-ANP,PSPMAC1050H-1R0M-ANP,PSPMAC1265H-1R0M-ANP/F,PSPMAA0603-1R5M-ANP/F,PSPMAA0604H-220M-ANP,PSPMAA0402-R68M-ANP,PSPMBL252012P-1R0M-BM,PSPMAA0502-4R7M-ANP,PSPMAA0412-1R0M-ANP,PSPMAA0618-2R2M-ANP,PSPMAC1250H-1R0M-ANP,PSPMAA0602H-1R5M-ANP,PSPMBL252010P-2R2M-BM,PSPMAA0410-100M-ANP,PSPMAA0502-R47M-ANP,PSPMAM0805-6R8M-ISP,PSPMAA0603-R22M-ANP/F,PSPMAC1040X-4R7M-ANP/F,PSPMAA0803H-150M-ANP,PSPMAM0805-3R3M-ISP,PSPMAC1770X-330M-IGP,PSPMAA0503-R68M-ANP,PSPMAA0618-R33M-ANP,PSPMAA0603-8R2M-ANP/F,PSPMAC1770X-5R6M-IGP,PSPMAC1770X-151M-ANP,PSPMAA0624H-4R7M-ANP/F,PSPMAA0803H-220M-ANP,PSPMAC1050H-8R2M-ANP,PSPMAA063T-150M-ANP/F,PSPMAA0603-R47M-ANP/F,PSPMAA0605H-4R7M-ANP,PSPMAC1040X-R47M-ANP/F,PSPM SERIES,PSPMBL252012P-R68M-BM,PSPMAC1050H-220M-ANP,PSPMAA0610-6R8M-ANP,PSPMAA0518-R56M-ANP,PSPMAA0618-R68M-ANP,PSPMGD2213-2R2M-ANF,PSPMAA1040H-R68M-ANP,PSPMAA0402-2R2M-ANP,PSPMAC1770X-100M-IGP,PSPMAA0624H-R47M-ANP/F,PSPMAC1040X-R36M-ANP/F,PSPMAA0603-4R7M-ANP/F,PSPMAA0605H-3R3M-ANP,PSPMAA0410-4R7M-ANP,PSPMAA0605H-R47M-ANP,PSPMBL252010P-1R0M-BM,PSPMAA0502-3R3M-ANP,PSPMAC1770X-3R3M-IGP,PSPMAA0604H-R68M-ANP,PSPMAC1250H-1R5M-ANP,PSPMAA0803H-100M-ANP,PSPMAC1265H-220M-ANP/F,PSPMAM0805-5R6M-ISP,PSPMAA1040H-330M-ANP,PSPMAA0502-8R2M-ANP,PSPMAC1770X-2R2M-IGP,PSPMAC1770X-8R2M-IGP,PSPMAA0605H-6R8M-ANP,PSPMAC1040X-330M-ANP/F,PSPMAA0412-1R5M-ANP,PSPMAA0603-3R3M-ANP/F,PSPMAC1040X-150M-ANP/F,PSPMAC1040X-2R2M-ANP/F,PSPMAA0402-R33M-ANP,PSPMAA0604H-1R0M-ANP,PSPMAM0805-4R7M-ISP,PSPMAA0503-100M-ANP,PSPMAA0602H-100M-ANP,PSPMAC1040X-470M-ANP/F,PSPMAC1770X-101M-IGP,PSPMAA0803H-R68M-ANP,PSPMAA0518-1R0M-ANP,PSPMAC1040X-R68M-ANP/F,PSPMAM0805-470M-ISP,PSPMAC1770X-1R5M-IGP,PSPMAA0604H-100M-ANP,PSPMGD2213-4R7M-ANF,PSPMAC1265H-4R7M-ANP/F,PSPMGD2213-470M-ANF,PSPMAA0412-R47M-ANP,PSPMAA0412-R33M-ANP,PSPMGD2213-750M-ANF,PSPMAC1040X-1R5M-ANP/F,PSPMAC1250H-R47M-ANP,PSPMAA0803H-1R0M-ANP,PSPMAA0402-1R5M-ANP,PSPMAA0604H-6R8M-ANP,PSPMAC1250H-3R3M-ANP,PSPMAC1040X-100M-ANP/F,PSPMAA0502-R33M-ANP,PSPMAM0805-680M-ISP,PSPMAC1050H-2R2M-ANP,PSPMAC1250H-2R2M-ANP,PSPMAA0605H-1R0M-ANP,PSPMAA0412-2R2M-ANP,PSPMAA0605H-100M-ANP,PSPMGD2213-680M-ANF,PSPMAA0618-R47M-ANP,PSPMAA0624H-R22M-ANP/F,PSPMAC1265H-680M-ANP/F,PSPMAA0602H-R68M-ANP,PSPMAA0603-100M-ANP/F,PSPMAA1040H-3R3M-ANP,PSPMAC1250H-6R8M-ANP,PSPMAA0502-R10M-ANP,PSPMAA0503-150M-ANP,PSPMAA0603-R68M-ANP/F,PSPMAA0602H-1R0M-ANP,PSPMAA0624H-1R0M-ANP/F,PSPMAA1040H-2R2M-ANP,PSPMAA0803H-6R8M-ANP,PSPMAA0605H-R68M-ANP,PSPMAA0402-8R2M-ANP,PSPMAA0624H-6R8M-ANP/F,PSPM,PSPMAA0503-6R8M-ANP,PSPMAA0618-1R5M-ANP,PSPMAA0603-2R2M-ANP/F,PSPMAC1040X-3R3M-ANP/F,PSPMAC1265H-1R5M-ANP/F,PSPMAM0805-220M-ISP,PSPMAA0518-100M-ANP,PSPMAA0604H-150M-ANP,PSPMAA0603-R82M-ANP/F,PSPMBL252010P-R33M-BM,PSPMAA063T-220M-ANP/F,PSPMAC1045H-101M-ANP,PSPMAA1040H-R22M-ANP,PSPMAA0604H-1R5M-ANP,PSPMAA1040H-4R7M-ANP,PSPMAC1045H-470M-ANP,PSPMAC1265H-100M-ANP/F,PSPMAA063T-100M-ANP/F,PSPMGD2213-220M-ANF,PSPMAC1265H-2R2M-ANP/F,PSPMAA0803H-R47M-ANP,PSPMGD2213-330M-ANF,PSPMGD2213-2R0M-ANF,PSPMAA0402-R56M-ANP,PSPMGD2213-230M-ANF,PSPMAA0605H-150M-ANP,PSPMAA1040H-1R5M-ANP,PSPMAC1040X-220M-ANP/F,PSPMGD2213-100M-ANF,PSPMAA0618-3R3M-ANP,PSPMAA0412-R68M-ANP,PSPMAA0402-100M-A
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