Based on the constant speed driving mode of servo motor, analysis of capacitor energy storage device’s parameter design was made, and then a group of reasonable capacitor energy storage parameters were given. Based on the parameters, to realize variable speed driving and multi-adaptability of the press, it put emphasis on analysis of the servo driver’s control parameters and the press’s output ability. And important conclusion was also provided. To confirm the accuracy of the conclusion, the special permanent magnet AC servo system was designed and experiment was carried on it. The results prove that the designed capacitor energy storage device can satisfy the power and control request of press stamping. Analysis on control parameters of the servo driver and output ability of the press is reasonable, which provides the reference for the development of servo press’s flexibility.

This paper describes an investigation of DTC for electromagnetic synchronous motor (ESM). It is mathematically proven that the increase of electromagnetic torque in an ESM is proportional to the increase of the angle between the stator and rotor flux linkages i f the exciting current is kept constant. The simulated results veri& the proposed control and also show a good dynamic characteristic.