| The motor is the main driving equipment of industrial systems; its failure will influence the normal running of the whole system, even will endanger the personal safety, and bring about the huge economic losses. So the research of motor protection has been an important topic in the field of relay protection.This paper proposes a failure monitoring system for motor cluster based on CAN network. The system not only implements the protection function for failure of motor, but also detects the potential mechanical failure. Real-time network based on CAN bus can control and manage motors in the factory.The motor protection device is a basic unit; its reliability and stability directly influence the implementation of protection functions. This paper introduces the design of microcomputer motor protection device based dual CPU structure: DSP and MCS-51 in detail. DSP assures data processing speed, and dual CPU configuration not only increases the reliability of the device, but also realizes many expend functions, such as LCD, keyboard operation, control, remote communication etc.Each protection device disperses in factory and operates independently can't satisfy the request of the industrial automation now. This paper proposes a failure monitoring system for motor cluster based on CAN network. In this system, background monitoring platform, to each motor in the network, can monitor the operation conditions in real-time, record the operation data, adjust parameter on-line, start or stop the motor remotely, chain configuration on-line, analysis and handle the accident, discover slight mechanic fault and send out a alarm information etc.Real-time performance is an important factor of appraising the quality of communication network. This paper studies the real-time performance of CAN, and analyzes the characteristic of data transfer in the failure monitoring system. It also introduces time-triggered CAN, and proposes a kind of solution of CAN real-time performance– improved CAN protocol based on time division. This paper also presents a scheme to distribute the identifier considering node priority and message priority which fully utilizes the advantage of CAN and raises the network respond ability. |
