基于CAN总线的大型电机磁场监测系统设计与实现
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摘要
为解决目前大型电机运行状态及故障实时监测系统设计中存在的总线结构不统一、信号线繁多、干扰大等问题,提出基于CAN总线结构的数字模块化三轴磁场监测系统的新概念。本文在对数字模块化磁场监测系统研究的基础上,对系统的重要部分——磁场监测节点模块和CAN上层应用协议进行了设计和调试,实现分布式矢量磁信号的采集、处理与传输,对于大范围、高精度、低功耗、实时电机磁场监测系统进行了有益的探索研究。
节点模块设计中采用了CAN总线技术,运用了超低功耗单片机MSP430作为控制核心,并且针对应用环境采用了更高效的信号特征量获取与处理方法。重点完成了三方面工作:一是完成了三轴磁传感器电路、CAN总线接口电路以及单片机控制电路的设计和硬件调试;二是借鉴DeviceNet协议初步进行了ID标志符的分配和报文滤波的设计,编写并调试了各控制器件上的初始化程序、数据采集与处理程序、节点接口程序及其他中断服务程序等;三是基于监测系统标准化、系列化、信息化的需要,以CAN2.0技术规范为标准,优化ID标志符的分配和报文滤波的设计,开发了可靠的收发机制、管理机制和错误处理机制等接口应用层协议,共同维护监测系统的运转,保证信息传输的实时性和可靠性。
实验通过构建两个节点组成的最小CAN总线系统,并完成节点程序调试和数据通讯实验分析,验证了数据传输格式及部分通信协议的可行性和正确性,为CAN总线在数字模块化监测系统的应用提供了可靠的依据。
In order to solve the problems of different bus units, excessive signal lines and interference existing in big electricity machine, fig-modularize three-axes magnetic field supervising system based on Controller Area Network (CAN in short) is bring forward. Following this concept, the module of supervising system which is important to the modular fuse is designed and debugged. And what the thesis has done does a favor to the development of big electricity machine supervising system in the future.
The thesis applies to the technique of CAN-bus. It uses the MSP430F427 which has ultralow-power consumption singlechip as the core of control. Also, more effective method to obtain signal characteristic parameter is adopted in allusion to different environment. Three points are accomplished: First, the design of three-axes magnetic field sensor, interface electrocircuit of CAN-bus and MCU control circuit have been completed as well as be debugged. Secondly, the programme of initialization of all controlling components and the software flow chart are completed. Besides, the thesis accomplished the distribution of ID symbol and design of the message filter primarily in accordance of the protocol of DeviceNet. Thirdly, the distribution of ID symbol and design of the message filter are optimized based on CAN2.0 technique standard. Then credible flow of initialization, transmission and receiving of data and processing errors is made based on the self-define communicate protocol to support the operation of system.
With the establishment of a minimal CAN-bus system composed of two nodes, this paper finished debugging and analyzing. The result of test indicates the feasibility and correctness of the modes of information transmission and part of protocols and supplies reliable attestation for CAN-bus applying to the digital and modular magnetic supervising system.
节点模块设计中采用了CAN总线技术,运用了超低功耗单片机MSP430作为控制核心,并且针对应用环境采用了更高效的信号特征量获取与处理方法。重点完成了三方面工作:一是完成了三轴磁传感器电路、CAN总线接口电路以及单片机控制电路的设计和硬件调试;二是借鉴DeviceNet协议初步进行了ID标志符的分配和报文滤波的设计,编写并调试了各控制器件上的初始化程序、数据采集与处理程序、节点接口程序及其他中断服务程序等;三是基于监测系统标准化、系列化、信息化的需要,以CAN2.0技术规范为标准,优化ID标志符的分配和报文滤波的设计,开发了可靠的收发机制、管理机制和错误处理机制等接口应用层协议,共同维护监测系统的运转,保证信息传输的实时性和可靠性。
实验通过构建两个节点组成的最小CAN总线系统,并完成节点程序调试和数据通讯实验分析,验证了数据传输格式及部分通信协议的可行性和正确性,为CAN总线在数字模块化监测系统的应用提供了可靠的依据。
In order to solve the problems of different bus units, excessive signal lines and interference existing in big electricity machine, fig-modularize three-axes magnetic field supervising system based on Controller Area Network (CAN in short) is bring forward. Following this concept, the module of supervising system which is important to the modular fuse is designed and debugged. And what the thesis has done does a favor to the development of big electricity machine supervising system in the future.
The thesis applies to the technique of CAN-bus. It uses the MSP430F427 which has ultralow-power consumption singlechip as the core of control. Also, more effective method to obtain signal characteristic parameter is adopted in allusion to different environment. Three points are accomplished: First, the design of three-axes magnetic field sensor, interface electrocircuit of CAN-bus and MCU control circuit have been completed as well as be debugged. Secondly, the programme of initialization of all controlling components and the software flow chart are completed. Besides, the thesis accomplished the distribution of ID symbol and design of the message filter primarily in accordance of the protocol of DeviceNet. Thirdly, the distribution of ID symbol and design of the message filter are optimized based on CAN2.0 technique standard. Then credible flow of initialization, transmission and receiving of data and processing errors is made based on the self-define communicate protocol to support the operation of system.
With the establishment of a minimal CAN-bus system composed of two nodes, this paper finished debugging and analyzing. The result of test indicates the feasibility and correctness of the modes of information transmission and part of protocols and supplies reliable attestation for CAN-bus applying to the digital and modular magnetic supervising system.
引文
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