Non Contact, Bidirectional Signal Transmission System For Rotary Machines Based On FPGA And Opticalelectric Coupling

Rotary machine is widely applied in many fields, on the research of this project, how to measure the parameters in real time and to control the actuator on the rotory machine remains an interesting topic for engineers. Comparing with current wireless signal transmission technology of rotary machine, the paper aiming at the existing weakness of tradional thansmission methods,such as complex structure, narrow bandwidth, weak anti-interference ability, adopt infrared photo-electric transmission approach to implement non-contacet, bidirection,data transmission between the rotary machine and fixed side. This approach features light, rapid, reliable, and overcomes the limit of rotate speed.The first chapter summarizes the status and the disadvantages of traditional methods of signal transmission system for rotary machine, then some popular methods, which are based on non-contact communication, are introduced in brief. In the second chapter, a general system design scheme is presented according to the need of multi-channel, real-time measurement and control combining with the existing hardware platform. In the third chapter, the theory of bit synchronization and frame synchronization is expounded, and a digtal synchronization circuit realization approach using FPGA is given in detail. The fourth chapter achieves the data acquisition hardware circuit design. A PCI DAQ platform is constructed in the fifth chapter, on which a test result is given. The last is the summary and prospect of this paper.By synthesising a bit synchronization receiving circuit of rate at 2Mbps inside the FPGA, the data receiving and storage is fulfilled from rotary side by FIR(Fast Infrared)transmission stably and reliable. Then the data is send to application program through PCI interface where it can be analyzed and displayed in real time. Furthermore, the application program can also send operation commands and data to control the actuator on the rotary machine according to the analysis result. The experiments show that the non-contact signal transmission is reliable and yields few errors.