servo technology has developed from the early 80s, application technology become more mature and the property improved every year. It is widely used in the cnc turning machine, packaging machine, printer, textile, machine and other automated equipment. SG series ac servo drive, a new generation product, use the latest 32- bit DSP unit As the center core work unit, which we research and devolop independently, Adopt the complex programable device EPLD and Mitsubishi intelligent power module. This ac servo drive has the advantage of high integration, small volume, fast response speed, prefect protection, high reliability etc.