基于转速差法的数显扭矩扳手研制  

Research and fabrication of digital torque wrench based on rotational speed difference method

作　　者：夏政诚 谢峰[1] 汪小武[1] XIA Zhengcheng;XIE Feng;WANG Xiaowu(School of Electrical Engineering and Automation,Anhui University,Hefei 230601,China)

机构地区：[1]安徽大学电气工程与自动化学院,安徽合肥230601

出　　处：《传感器与微系统》2020年第10期93-96,共4页Transducer and Microsystem Technologies

基　　金：安徽省2018年度重点研究与开发计划资助项目(1804A09020003)。

摘　　要：针对市场中数显扭矩扳手的结构复杂、扭矩范围小、精度低等问题,研制了一种基于转速差法的数显扭矩扳手。利用串励电机扭矩与转速差的线性关系实现扭矩控制,通过可编程中断控制器(PIC)单片机的捕捉/比较/脉宽调制(CCP)模块捕捉转速传感器输出的脉冲信号,并采用滑动加权平均滤波算法消除随机干扰噪声得到转速差。最后使用最小二乘法处理标定数据得到扭矩与转速差的关系表达式。实验结果表明:该数显扭矩扳手的扭矩输出范围为1200~4000 N·m,系统误差小于3%,验证了设计方案的可行性。Aiming at the problem of complicated structure,small torque range and low precision of the digital torque wrench in the market,a digital torque wrench based on the rotational speed difference method is researched and fabricated.The system implements torque control by using the linear relationship between torque and rotational speed difference of series motor,the pulse signal outputted by the speed sensor is captured by the capture compare PWM(CCP)module of the programmable interrupt controller(PIC)microcontroller unit(MCU),and use the sliding weighted average filtering algorithm to eliminate random interference noise and the speed difference is obtained.Finally,the calibration data is processed using the least squares method,and the relationship between the torque and the rotational speed difference is obtained.The experimental results show that torque output range of the digital torque wrench is 1200~4000 N·m,and the system error is less than 3%,which verifies the feasibility of the design scheme.

关 键 词：数显扭矩扳手 转速差法 串励电机 滤波算法 

分 类 号：TP216[自动化与计算机技术—检测技术与自动化装置] TP368.2[自动化与计算机技术—控制科学与工程]