Research on the Signal Detection Technology of the Servo System of High-Response Linear Motor

　　Research on the Signal Detection Technology of the Servo System of High-Response Linear Motor
　　Linear Motors are novelty motors that can realize direct drive and convert electricity energy into linear movement without any medium machine. They have wide application foreground in many fields such as high speed and high precision numerical control, precision measurement because of their advantages of high speed, high precision, big thrust force, long stroke and fast response.In the control process of Linear Motors, the acquisition of feedback signals is Alnico Magnets very important. So the research involved signal detection has been a focus.Firstly, the paper gives an introduction to the structure and basic theory of the permanent magnet synchronous linear motor (PMSLM). And also the difficulty of control system is discussed based on the control method of PMLSM in this paper. Then position detection technology, current detection technology, hardware system and software design is discussed.Because of the special structure characteristic of the PMSLM, high resolution linear encoder was adopted as detecting component. And subdivision technology was used to improve the detecting resolution. At the same time, the position collecting circuit design based on the chip LS7266R1 is proposed. The approach based on electrical current Hall device is used to detect electrical current, with simple installation and the results meet to the requirement. And then signal detected is converted into voltage signal by special electrical circuit. A/D converter model was designed in order to sampling the converted voltage signal, which was based on chip MAX125 and achieved very high accuracy. In addition, protect circuit was designed. When there is fault in the circuit, it will close off the control signal and http://www.999magnet.com/products/108-alnico-magnets send out an interrupt request to Digital Signal Processor(DSP). Interference was considered when designed hardware and software, so the reliability and stability of PMSLM were improved.Finally, controlling boards and software were debugged. And experiments about the performance of the linear motor servo control were done. At last, the paper analyzed the experiment results and presented some problems about the linear motor servo system and the further research work.