The Design Of Stepping Motor Drive Control System Based On SOPC

The stepping motor is widely used in various automatic control field because of its advantages of low cost, high response frequency, easy to open loop control, continuous operation without accumulated error, etc. Programmable system on chip (SOPC) provides a new solution for embedded system with its futures of flexible, scalable and extensible.This thesis takes the two phase hybrid stepping motor as the application object and researches the working principle and drive control technology of stepping motor and the SOPC technology firstly, then designs a distributed drive control system of stepping motor. This thesis focuses on the design of stepping motor drive controller based on SOPC.This system consists of two parts, one is the upper system, and the other is the lower system. The upper system was designed with LabWindows/CVI tools. The interface is friendly and the operation is easy. The lower system takes distributed architecture and changes disadvantage of the traditional centralized control architecture. It improves the real-time performance and the flexibility of the system. The lower system comprises a master node and several sub nodes. The master node plays as an intermediate node for data transmission and the sub nodes take charge of controlling the motor. The sub nodes use EP2C8Q208C8N chip of Altera Company Cyclone II series, making full use of the advantages of FPGA chip as high speed, flexibility and programmability. The intelligent drive control module of stepping motor takes the SOPC as the center with the peripheral circuit such as the power driving chip and so on. It has micro controller and RS485 BUS interface. This thesis studies the SOPC system design flow, the hardware and software co-design method. The logic circuit was packaged into an IP core. This thesis also designs and realizes an embedded processor system based on Nios II processor, increasing the expansibility, reusability and scalability of the systemThe simulation and test results show that the stepping motor can be controlled by the system as the function of start, stop, speed-up, speed-down and microstepping, etc. The microstepping is up to 128. The function of the system has achieved intended purpose and the stepping motor works flexibly, stably and reliably.