A scanning probe microscope(SPM)stage controlled by three stepper motors is designed,which has more flexibilitiesthan that of one motor controlled stage,while the control whom is more complicated.In this project,we bu...A scanning probe microscope(SPM)stage controlled by three stepper motors is designed,which has more flexibilitiesthan that of one motor controlled stage,while the control whom is more complicated.In this project,we build the stageactions in an Arduino microcontroller,and finite state machine(FSM)is also built in the Arduino micro controller to communicatewith a computer and a radio frequency(RF)controller.A special displaying scheme with five states is employed to indicatethe operation of the stage.Finally,the stage is fully tested and has a700nm resolution in Z motion of the SPM.展开更多
This paper presents the design and implementation of a Stepper Motor using Nexys2 circuit board based on a Xilinx Spartan 3E Field Programmable Gate Array (FPGA) device with VHDL code. The algorithm implemented on FPG...This paper presents the design and implementation of a Stepper Motor using Nexys2 circuit board based on a Xilinx Spartan 3E Field Programmable Gate Array (FPGA) device with VHDL code. The algorithm implemented on FPGA allows a substantial decrease of the equivalent processing time developed by different velocity controllers. The Stepper Speed control is achieved using VHDL code, and the hardware digital circuit is designed for a programmable rotational stepper motor using VHDL as a tool and FPGA as a target technology. The 50 MHZ provided by the starter kit is divided to obtain the necessary delay time between the motor phases that ranges between 2 - 10 m seconds. Though output selections, the direction of rotation of the stepper motor besides the magnitude of the angle of movement and the rotation speed can be controlled. The major advantage of using reconfigurable hardware (FPGA) in implementing the Stepper Motor instead of a discrete digital component is that it makes modifications to the design easy and quick and also, the total design hence represents an embedded system (works without computer). The total programmable hardware design that controlled on the stepper motor movement, occupied an area that did not exceed 12% of the chip resources.展开更多
人机接口设备是核电厂安全级仪控系统(Digital Instrumentation and Control System,DCS)的重要部件,鉴定试验要求在试验应力下对其进行操作,并测试其功能和性能。核电DCS设备鉴定的部分试验条件十分严酷,很难在试验中对设备进行操作。...人机接口设备是核电厂安全级仪控系统(Digital Instrumentation and Control System,DCS)的重要部件,鉴定试验要求在试验应力下对其进行操作,并测试其功能和性能。核电DCS设备鉴定的部分试验条件十分严酷,很难在试验中对设备进行操作。之前采用的方法是测试人员穿防护设备进入温箱等严酷环境进行测试,既影响了试验效率,又可能对测试人员造成健康上的损害。本文首先分析了鉴定试验的环境特点;然后提出采用步进电机进行精确控制的方法,实现对人机接口设备的自动操作;最后结合鉴定试验特点,给出对机械臂的防护措施。基于该测试方法集成的自动测试装置已投入鉴定试验活动中,并实现了远程全自动操作。展开更多
文摘A scanning probe microscope(SPM)stage controlled by three stepper motors is designed,which has more flexibilitiesthan that of one motor controlled stage,while the control whom is more complicated.In this project,we build the stageactions in an Arduino microcontroller,and finite state machine(FSM)is also built in the Arduino micro controller to communicatewith a computer and a radio frequency(RF)controller.A special displaying scheme with five states is employed to indicatethe operation of the stage.Finally,the stage is fully tested and has a700nm resolution in Z motion of the SPM.
文摘This paper presents the design and implementation of a Stepper Motor using Nexys2 circuit board based on a Xilinx Spartan 3E Field Programmable Gate Array (FPGA) device with VHDL code. The algorithm implemented on FPGA allows a substantial decrease of the equivalent processing time developed by different velocity controllers. The Stepper Speed control is achieved using VHDL code, and the hardware digital circuit is designed for a programmable rotational stepper motor using VHDL as a tool and FPGA as a target technology. The 50 MHZ provided by the starter kit is divided to obtain the necessary delay time between the motor phases that ranges between 2 - 10 m seconds. Though output selections, the direction of rotation of the stepper motor besides the magnitude of the angle of movement and the rotation speed can be controlled. The major advantage of using reconfigurable hardware (FPGA) in implementing the Stepper Motor instead of a discrete digital component is that it makes modifications to the design easy and quick and also, the total design hence represents an embedded system (works without computer). The total programmable hardware design that controlled on the stepper motor movement, occupied an area that did not exceed 12% of the chip resources.
文摘人机接口设备是核电厂安全级仪控系统(Digital Instrumentation and Control System,DCS)的重要部件,鉴定试验要求在试验应力下对其进行操作,并测试其功能和性能。核电DCS设备鉴定的部分试验条件十分严酷,很难在试验中对设备进行操作。之前采用的方法是测试人员穿防护设备进入温箱等严酷环境进行测试,既影响了试验效率,又可能对测试人员造成健康上的损害。本文首先分析了鉴定试验的环境特点;然后提出采用步进电机进行精确控制的方法,实现对人机接口设备的自动操作;最后结合鉴定试验特点,给出对机械臂的防护措施。基于该测试方法集成的自动测试装置已投入鉴定试验活动中,并实现了远程全自动操作。
