近年来，诸多家电、科技企业纷纷下场布局智能家居系统建设，智能家居产业已逐步实现从单一家电智能到全屋智能的跨越。比如基于传感器、物联网技术应用，现代化的智能家居系统可以实现诸多家庭内部设备、车辆和外部城市基础设施的互联互通；基于人工智能技术更好地理解用户需求和习惯，以此提供更个性化、智能化的服务。同时，用户还可以通过智能家居平台不断拓展新的创新应用，如环境监测、能耗监测、健康管理功能等。

 

而落地到实际应用中，嵌入式计算机作为智能家居系统的核心组成，必须具备更强大的数据处理能力、可扩展性、安全性能等，满足消费者对智能家居系统多智能设备互联互通、个性化定制和隐私保护的需求。

02适用于智能家居系统的EM6412I

华北工控是行业专用嵌入式计算机产品提供商，可以为多行业领域客户提供X86架构和ARM架构多样化嵌入式主板、嵌入式准系统/整机和工业平板电脑产品及客制化服务，此次推出的基于Intel Celeron J6412处理器的嵌入式主板EM6412I，完全满足智能家居系统的应用需求。

 

EM6412I满足智能家居系统对高性能计算、高速缓存和大容量存储的需求：

▪ 支持Intel Celeron J6412处理器，TDP up to 10W，具有4核4线程，基本频率2.0Ghz，大可提升至2.6 GHz，可以在低功耗的条件下实现高效处理；

▪ 支持2*SODIMM 内存插槽，支持DDR4 2400/3200MHz，高可达32GB运行内存；

▪ 支持1*SATA3.0、1*M.2(MKEY 2280 PCIE X2信号)接入PCIe协议的SSD和1*MiniPCIe(支持SATA信号)扩展MSATA，以此实现高速缓存和增大存储容量。
 

EM6412I配置了丰富的功能接口，可以实现智能家居系统多智能设备的互联互通及其他扩展应用：

▪ 支持2*LAN  100/1000Mbps RJ45；

▪ 支持6*RS232、10*USB2.0和2*USB3.0接口；

▪ 支持1*MiniPCIe(支持PCIE/USB信号)扩展WIFI/BT/3G/4G模块；

▪ 支持1*HDMI、1*LVDS、2*VGA多种显示接口独立多显和高4K分辨率显示；

▪ 支持1*Mic_in，1*LINE_OUT外露，2*5PIN 2.0mm小白座引出1*MIC、1*LINEIN、2*speaker喇叭(6W/通道 8欧姆)，以及1*3PIN 1.25MM小白座引出1*LINEIN，兼容支持多种音频设备的功放需求；

▪ 支持1*PCIe x4插槽(支持PCIE X2信号)；

▪ 支持1*PCIe x1 插槽(支持PCIE X1信号)；

▪ 支持1*CPUFAN(支持调速)、1*SYSFAN、8*GPIO、1*PS2 KBMS实现更多扩展应用；

▪ 支持1*JFP 2X4PIN 2.0MM小白座引出电源灯/硬盘灯/蜂鸣器/开关方便用户使用。
 

EM6412I满足智能家居系统对低功耗、高可靠性和易于部署的需求：

▪ 支持1*TPM（可选）生成、存储和管理加密密钥提供增强的安全性能；

▪ 支持Windows 10/11、Linux操作系统，开发了看门狗功能，可以为用户提供更高安全性的计算机系统运行环境；

▪ 支持ATX电源供电，低功耗、输出稳定；

▪ 具备抗电磁干扰、防尘、防潮、0℃～60℃宽温作业等工业级耐用性；

▪ 尺寸为170mm x 170mm，小体积，更易于部署。

Shaft current is one of the common problems in high-voltage motors, generators, variable frequency motors, and other types of motors. When the shaft current is high, it can cause the bearing system of the motor to collapse, even affecting the motor winding. Therefore, the control of shaft current is a common concern for motor manufacturers and even users.
A netizen suggested that he detected the shaft voltage and asked if it is possible to measure the shaft current? We will have a brief discussion on whether shaft voltage will harm the bearing system of the motor and other related issues.
From the analysis of the principle of current formation, shaft voltage and closed circuit are necessary conditions for generating shaft current. The measures to avoid shaft current are based on two ideas: cutting off the circuit or bypassing it.
If circuit breaking measures such as insulated bearings, insulated end caps, and insulated bearing sleeves are used in the design and manufacturing process of the motor, even if the shaft voltage exists, because no closed circuit can be formed, the shaft current will naturally not be generated.
If a bypass measure is adopted, that is, guiding the direction of shaft current through grounded carbon brushes, it can greatly reduce the magnitude of shaft current and naturally solve the problem of shaft current harm to bearings.
We are now discussing another issue, which is raised by the netizen. When the shaft voltage is high, it will pose a threat to the quality and performance of bearings. Therefore, necessary measures need to be taken when the shaft voltage is high! According to the accumulation and statistics of data from different motor manufacturers, when the shaft voltage generated by the motor does not exceed 350mV, it does not have a significant impact on the bearing system of the motor. Otherwise, corresponding avoidance measures must be taken.
Finally, let's talk about the detection of shaft voltage and shaft current. Relatively speaking, the detection of shaft voltage is relatively simple, and can be detected using a millivolt meter with appropriate accuracy. However, due to the irregularity of the shaft current passing through the channel, the collection of shaft current is relatively difficult, and specialized detection equipment is needed for detection.
The shaft current monitoring device adopts a high-performance microcontroller as the core control component to form a controller, and a hollow ring transformer as the shaft current sensor to monitor the changes in motor shaft current. The microcontroller monitors the real-time change value of the shaft current sensor, which is linearly related to the large shaft current. After filtering and numerical transformation, it is confirmed that the shaft current exceeds the set value. The shaft current monitoring device outputs a second level alarm signal. The device displays the specific current size in real-time through parameter tuning.