电气自动化专业毕业论文--基于霍尔式传感器技术的数字式车速技的设计（课程设计）.docVIP

目录 摘要 I ABSTRACT II 前言 V 1 霍尔器件的介绍 1 1.1 霍尔器件与车速计的关系 1 1.2 霍尔器件的原理 3 1.3 霍尔接近开关 4 1.4 霍尔速度传感器内部 4 2 霍尔传感器与车速计 5 2.1 原理 5 2.2 关系图 6 2.3 计算机程序中的关系 7 2.4 执行器驱动控制电路 11 3 车速计的介绍 13 3.1 磁电式车速传感器 13 3.2 霍尔式车速传感器 13 3.3 光电式车速传感器 14 4.1 概述 24 4.2 LWGY基本型涡轮流量传感器 24 4.3 流量脉冲信号采集电路 27 摘 要 霍尔传感器是一种当交变磁场经过时产生输出电压脉冲的传感器。脉冲的幅度是由激励磁场的场强决定的。因此，霍尔传感器不需要外界电源供电。霍尔传感器可广泛应用于：1电子式水表、气表、电表和远程抄表系统2控制设备中传送速度的测量3无刷直流电机的旋转和速度控制4在工程中测量转动速度和其他机械上的自动化应用5转速仪、速度表以及其他转子式计量装置 ABSTRACT This graduation project researchs content is: Controls the electrically operated actuators opening, thus controls in the pipeline the agricultural chemicals current capacity, and carries on the sampling through the flowmeter to the current capacity. Constitution closed loop feedback control. And considered factors and so on tractor speed, achieve to the pipeline current capacity precise control. The topic research significance lies in the precise agricultural concept applies in the true agricultural production, promotes our country agriculture the modernization, the electrification, the automation. The project uses the monolithic integrated circuit control electrically operated actuator interior electrical machinery Field various plots need fertilizer the ratio and the unit area employment quantity beforehand have programmed store the database; By current machines and tools approaching speed, control broadcast sowing quantity fertilizer. The computer as the system superior machine, accepts the position signal, obtains the current position according to the positional information through the database the quantity fertilizer, simultaneously reads the Doppler radar, the present machines and tools speed and the gain policy-making data synthesis operation, transforms the quantity fertilizer by the digital quantity into the liquid current capacity output, thus realizes the control of variable quantity fertilizer. Keywords:Electrically operated actuator Digital-analog convers