电动电子车速里程表的研究

介绍一种新型电动电子车速里程表,霍尔速度传感器,里程计数脉冲的产生以及步进电机的驱动和BL2115集成电路在电动电子车速里程表中的应用.     

电动自行车里程速度计的设计

主要阐述了一种基于霍尔元件的电动自行车的速度里程表的设计。它以STC89C51单片机为核心,采用A44E霍尔传感器测量转数实现对电动自行车里程/速度的测量统计,还具有系统掉电时保存里程信息的功能,并能将电动自行车的里程数及速度用LCD实时显示。     

电动电子车速里程表的研究

本文介绍一种新型电动电子车速里程表,以及霍尔速度传感器,里程计数脉冲的产生,步进电机的驱动和ＢＬ２１１５集成电路在电动电子车速里程表中的应用。     

基于单片机和CPLD的无刷直流电机系统

基于高速单片机和复杂可编程逻辑器件(CPLD)设计了一种具有霍尔位置传感器接口电路、电流采样电路以及编码器接口电路的无刷直流电机伺服控制器.该控制器可以实现无刷直流电机的有位置传感器控制和无位置传感器控制.以霍尔位置传感器的位置信号作为电机的换向信号并对该信号进行六倍频处理作为速度反馈,从而实现对电机的转速控制,给出了该控制系统的硬件结构设计和软件流程设计.试验结果表明:该无刷直流电机控制系统能够较好地实现电机的转速控制,为电机控制系统的设计提供了新思路.     

基于PLC电机测速系统的设计

介绍了利用PLC及霍尔传感器设计的电机测速系统,该系统通过4位8段数码显示管实现数据输出,方便直观,重点阐述了电机测速系统的基本工作原理及硬件构成,并编写了相应的程序,系统构建成本低,且可获得高精度和高可靠性的电机速度测试数据。     

电动电子车速里程表的研究

本文介绍一种电动电子车速里程表，以及霍尔速度传感器，里程计数脉冲的产一，步区动和ＢＬ２１１５集成电路在电动里程表中的应用。     

基于LabVIEW的电机转速测试实验系统设计

采用虚拟仪器控制技术,利用CS3020霍尔磁性开关,对电机转速测量,实时采集电机的实际工作参数,以LabVIEW为平台,实现了对电机工作特性参数曲线的可视化测定,并对工作特性进行分析与处理。实验结果表明,所设计的系统方案合理可行,电机工作特性测试方便准确。     

智能式汽车速度里程表

采用新型霍尔开关传感器和8031单片机研究成功智能式汽车速度里程表。本文阐述智能式汽车速度里程表的工作原理和程序流程图,介绍仪表的实验结果、性能指标、结构特点和开发应用前景。     

永磁同步电机双向检测启动控制的研究

针对永磁同步电机(PMSM)启动控制的设计与实现过程,以数字信号处理芯片TMS320LF2812为核心控制单元,采用霍尔传感器与增量式光电编码器等位置反馈元件,提出了通过粗测与双向精准检测来测量确定启动位置的方法.用该方法控制启动电流,可以避免过流或欠流等问题.最后,利用Matlab建立了模型,通过仿真验证了该方法的应用对启动电流等方面的控制优点.试验表明,该方法能实现对电机转子启动位置的精确控制.     

适用于无轴承薄片电机的低成本霍尔近距离位移传感器

基于无轴承薄片电机的需要而开发和研究了两种低成本霍尔位移传感器,介绍了基本的工作原理,对模型进行了理论分析,设计了匹配电路与霍尔元件相结合,并在动态和静态下进行了实验.实验结果表明该位移传感器有较高的测量精度,与理论分析比较吻合.应用结果表明该位移传感器性能优良,能够满足无轴承薄片电机的要求.     

霍尔式磁电里程仪系统设计

设计了基于线性霍尔传感器的磁电式里程仪测试系统,主要从磁路、硬件电路和单片机3个方面进行了研究,通过实验验证了系统的可靠性和可行性,能够提高非接触测量的距离,最高测量精度可以达到0.015m。     

基于霍尔效应的车用角位置传感器线性化研究

线性度是传感器的重要性能指标之一。基于霍尔效应的霍尔角位置传感器的霍尔输出电压可表达为:UH=KHBIcosθ,霍尔输出电压与被测角度θ之间的关系是非线性的。针对角位移变化引入的非线性变量cosθ使得普通的磁场结构难以实现霍尔角位置传感器较大范围线性输出的问题,本文提出了一种改进的车用霍尔传感器磁场结构,通过对改进后的磁场结构用有限元仿真计算和实验测量均得出改进后的磁场结构能够实现霍尔角位移传感器的霍尔输出电压与被测角度之间呈线性变化。     

Real-time accurate odometer velocity estimation aided by accelerometers

In strap-down gyro-compass in-motion alignment, the alignment accuracy depends not only on the quality of the gyroscopes and accelerometers, but also on the accuracy of the velocity provided by the aiding sensors such as odometers. To improve the accuracy of the in-motion alignment, real-time accurate odometer velocity estimation is required. In this paper, the effect of the noise of the odometer velocity on strap-down gyro-compass in-motion alignment accuracy is presented, based on the strap-down gyro-compass algorithm. A velocity tracking model is designed as the state model, to describe the relationship between and among the vehicle’s velocity, acceleration and jerk in the vehicle frame. Based on the velocity equation applied to strap-down navigation system mechanizations, the vehicle’s acceleration in the vehicle frame can be obtained from the specific forces measured by accelerometers. With the observations including the vehicle’s acceleration in the vehicle frame and the vehicle’s velocity in the vehicle frame obtained from the odometer using the first order difference algorithm, real-time velocity estimates are produced by a Kalman filter. The field test results show that the proposed method can successfully improve the accuracy of the odometer velocity. The comparison with the traditional method highlights the superior performance of the proposed method.     

一种廉价的基于霍尔元件的电机转速测量装置的实现

介绍了一种廉价的转速测量装置，包括用霍尔传感器和磁钢构成的脉冲发生器，与单片机的接口电路和倍频电路以及所采用的测速算法。     

微型无刷直流电机在CO_2/H_2O分析仪中的应用

针对无刷直流电机在CO2/H2O分析仪中的应用,介绍了CO2/H2 O分析仪的基本原理和系统结构,简述了直流无刷电机的控制原理,提出一种用于CO2/H2O分析仪的微型无刷直流电动机驱动器的设计方案。分析了霍尔位置传感器的一种定位方法,并讨论了电机转速闭环控制和转动稳定性的调试方法。应用结果表明,该控制系统运行稳定可靠,设计满足CO2/H2O分析仪的要求,简化了系统结构,能够实现气体的快速采集。     

直流电机控制与速度检测系统

以STC89C52单片机作为控制器,采用L298N芯片作为电机控制芯片,选用S177霍尔元件传感器,并用T测量法,设计了直流电机控制和速度检测系统。该系统能对电机的转速和转向进行实时控制,能同步显示电机转速与转向。系统具有控制灵敏,速度检测准确,电路简单易行的特点。     

基于霍尔效应的浮子式液位计

本文介绍了一种新型液位计，它根据霍尔效应，选用了霍尔开关矩阵作为敏感元件，利用磁浮子进行液位指示，满足了高压密封环境下测量液位的要求。     

ENHANCING KALMAN FILTERING–BASED TIGHTLY COUPLED NAVIGATION SOLUTION THROUGH REMEDIAL ESTIMATES FOR PSEUDORANGE MEASUREMENTS USING PARALLEL CASCADE IDENTIFICATION

Integrated global positioning system (GPS) solutions that utilize micro-electro-mechanical systems (MEMS)-based inertial sensors provide a more accurate navigation solution than stand-alone GPS in challenging scenarios. To keep the integrated solution less affected by sensor errors and to decrease the cost, a reduced inertial sensor system (RISS), which consists of only one gyroscope and two accelerometers, together with an odometer and integrated with GPS, is proposed. Tightly coupled integration is a better choice in demanding scenarios, as it can provide GPS aiding even when the number of visible satellites is three or less. However, inaccuracies of pseudoranges measured by the GPS receiver and used as aiding in the RISS/odometer/GPS integration solution will affect the overall positioning accuracy. This article explores the benefits of using parallel cascade identification (PCI), a nonlinear system identification technique that improves the overall navigation solution by modeling residual pseudorange correlated errors to be used by a Kalman filter (KF)–based tightly coupled RISS/odometer/GPS navigational solution. When less than four satellites are visible, the identified parallel cascade model for the still visible satellites is used to predict the residual pseudorange errors for these respective satellites, and the corrected pseudorange value is provided to KF. The performance of PCI for correcting the pseudoranges is examined and verified using road test trajectories and compared to a traditional tightly coupled RISS/odometer/GPS KF solution. The results demonstrate the advantages of this technique in correcting the pseudoranges and enhancing the positional solution.     

基于FPGA的高精度霍尔测速方法

为了解决传统霍尔测速准确性和快速性相互制约的问题,以实现空间用飞轮转速的快速准确测量;分析了霍尔测速误差产生的主要原因,提出了一种改进的周期测速法(T测速法),并给出了基于现场可编程门阵列(FPGA芯片)和硬件描述语言(VHDL)的实现办法;实验表明在同等精度的条件下,该方法速度反馈时间为传统方法的1/18,相对误差优于0.01%,实现了飞轮转速的快速准确测量.     

Development of the caliper system for a geometry pig based on magnetic field analysis

This paper introduces the development of the caliper system for a geometry PIG (Pipeline Inspection Gauge). The objective of the caliper system is to detect and measure dents, wrinkles, and ovalities affect the pipe structural integrity. The developed caliper system consists of a finger arm, an anisotropic permanent magnet, a back yoke, pins, pinholes and a linear hall effect sensor. The angle displacement of the finger arm is measured by the change of the magnetic field in sensing module. Therefore the sensitivity of the caliper system mainly depends on the magnitude of the magnetic field inside the sensing module. In this research, the ring shaped anisotropic permanent magnet and linear hall effect sensors were used to produce and measure the magnetic field. The structure of the permanent magnet, the back yoke and pinhole positions were optimized that the magnitude of the magnetic field range between a high of 0.1020 Tesla and a low of zero by using three dimensional nonlinear finite element methods. A simulator was fabricated to prove the effectiveness of the developed caliper system and the computational scheme using the finite element method. The experimental results show that the developed caliper system is quite efficient for the geometry PIG with good performance.