Research On The DSP-based Driving Technology Of The AC Permanent Magnetic Synchronous Linear Motors

Compared with common servo driving mechanism, linear motors have lots of advantages in fast response and precision, because it could convert electrical energy into linear motion directly. Using linear motor servo driving system is a new development direction of high speed precision machines. At present, researching on linear motors and its servo driving technologies has become an academic focus.Firstly, the general structure and basic working principle of Permanent-Magnet Synchronous Linear Motor (PMSLM) are introduced in this paper. According to the operation principles of DSP (Digital Signal Processor) and IPM (Intelligent Power Modules), an overall design scheme for PMSLM is proposed.Because the main point of this paper is about linear motors'driving technology, a printed circuit board including several function modules is designed. The whole driving system's security and reliability are enhanced by the protective circuits for the main circuit on the board. Interface circuits for DSP and IPM are designed according to their inner operational principles. Based on AT89C52, display module for linear motor's parameters is developed and the communication between AT89C52 and DSP is implemented. During the process of experiment and board designing, series of measures are introduced to avoid noise. In order to meet the requirement of PMSLM servo driving system, a multi-output single-chip switching power supply is developed using TOP223Y as a pulse width modulation chip. After analyzing the TOP223Y's operational principle, a high frequency transformer and the whole power supply circuit are designed. In the meantime, this paper also discussed how to reduce ripple voltage.Finally, some experiments are carried out to verify the performance of the developed driving system.The experimental results include velocity and ripple voltage test of auxiliary switching power supply.