An Experimental Study on Microcomputer Control of Pump Controlled Motor Systems

Pump controlled motor electrohydraulic servo systems are much used in circumstances where high power drive is needed. This kind of system has the advantage of energy-saving. But, it also has some defects that have to be improved. Microcomputer control of a pump controlled motor electrohydraulic servo system is studied. A PID controller is first adopted on the closed loop control system, and experimental results are obtained. Then, a model reference adaptive controller is designed and realised on the same system applying a single board microcomputer. Experimental results show that the dynamic properties of the adaptive control system is much better than those of the PID system under different inertia load conditions.

LMI Approach to Robust H_∞/H_2 Controller Design with Regional Poles Constraint of a Pump-Motor System

The time domain guideposts requirements of a pump-motor system is transfered into a series of constraints which express the robust performance upper bound and regional poles limits of the closed loop system. Then the servo system control problem is transferred into the problem of robust performance optimizing under regional poles constrains described by linear matrix inequality （LMI）. These LMIs are easy to solve through the Matlab LMI-toolbox. Simulations indicate that the controller has excellent dynamic, static and disturbance rejection performance, and the control system is robust and has perfect H2 performance to the bounded external torque disturbance.

Design on Vibration Monitoring and Fault Diagnosis System of Large Water Pump Motor

Large water pump motor,whose operation decides the reliability of the whole production line,plays a very important role.Therefore,its online condition monitoring can help companies better know its operation,process fault analysis and protection.The essay mainly studies and designs large water pump motor′s real time vibration monitoring and fault diagnosis system.The essay completes the systems project design,the establishment of the system and performance test.Eddy-currentsensor,XM-120 vibration module,XM-320 axial translation module,XM-362 temperature module,XM-360 process amount module and XM-500 gateway module are used to measure the axial vibration and displacement of main motors.Laboratory tests prove that the system can meet the requirements of motor vibration monitoring.

LQ Speed Control of Pump Controlled Motor System

A linear quadric (LQ) optimal speed control algorithm is proposed for the speed control of a pump controlled motor hydraulic system. The control theme consists of optimal state feedback and disturbing compensation based on observation. The optimal state feedback bases on LQ cost function. The disturbing compensation is realized through reconstructing the state of load torque. A series of simulation are performed, and the results show that the control performance is satisfactory and can be maintained under changes of load torque.

Dynamic Modelling of Submersible Pump Based Solar Water-Pumping System with Three-Phase Induction Motor Using MATLAB

The main purpose of this paper is to design and model a water-pumping system using a submersible multi-stage centrifugal pump driven by a three-phase induction motor. The system is intended for pumping water to the surface from a deep well using three power supply systems: a general network, a photo-voltaic (PV) system, and a PV system with a battery bank. These systems are used to compare two three-phase induction motors—namely, a motor with a drive and another one without a drive. The systems dynamic models are simulated in MATLAB/Simulink and the results compared with the manufacturer’s data for validation purposes. The simulation results generally show system dynamics and expected performance over a range of operation.

Lubrication characteristics of external return spherical hinge pair of axial piston pump or motor under combined action of inclination and offset distance

External return mechanism is a mechanical structure applied to axial piston pumps.To study its lubrication characteristics,the Reynolds equation applied to an external return spherical hinge pair was deduced based on the vector equation of relative-motion velocity of the external return spherical hinge pair under the influence of external swash plate inclination and offset distance.The results show that the total friction,axial leakage flow,and maximum value of the maximum oil-film pressure increase with increasing pump-shaft speed and decrease with increasing offset distance in one working cycle when the external-swash-plate inclination is constant.However,the varying offset distance has little effect on the axial leakage flow.The maximum value of the maximum oil-film pressure decreases with increasing external-swash-plate inclination and the total leakage flow increases with increasing external-swash-plate inclination in one working cycle when the offset distance is constant.It can be seen that the abovementioned parameters are important factors that affect the lubrication characteristics of external return spherical hinge pairs.Therefore,the complex effects of different coupling parameters should be comprehensively considered in the design of the external return mechanism.

柱塞泵马达高压油路压力脉动耦合特性

柱塞泵马达系统高压油路存在固有的压力脉动现象,其激发振动和噪音,恶化动力传递的平稳性,严重影响系统的可靠性和寿命。以往的研究主要聚焦于高压柱塞泵的压力脉动,而对柱塞泵马达系统高压油路的压力脉动耦合特性缺少研究。针对以上问题,通过揭示柱塞泵马达系统高压油路压力脉动的耦合机理及耦合特征,提出柱塞泵马达系统高压油路压力脉动解耦新方法。利用解耦新方法研究发现,泵源激励是贡献柱塞泵马达系统高压油路压力脉动的主要根源。对于所研究的联体设计的泵马达,在泵满排量状态下,泵源激励对高压脉动的平均贡献占比高达72%,而马达贡献占比仅为28%。新方法及所得到的新结论加深了对柱塞泵马达系统高压油路压力脉动耦合特性的认识,为进一步抑制和利用柱塞泵马达系统高压油路的压力脉动现象提供了理论支撑。

基于变补油及冲洗回路联控的泵控马达系统热管理方法

针对静液压驱动的工程及农业装备中典型泵控马达系统低压回路存在连续功率损失,回路油液温度随负载及油箱温度变化大等问题,本文提出一种基于变补油及冲洗回路(ACFC)联控的节能热管理方法。在典型泵控马达系统低压回路中引入电比例恒压变量泵及电比例节流阀,实现冲洗流量可控调节及补油流量自动适应,以提供回路温度的控制自由度;基于实验测试数据,构建基于损失模型的泵控马达系统产热模型;依据系统产热模型设计了一种基于前馈+PD反馈控制算法的热管理方法对回路温度进行控制;采用基于功率跟随的泵控马达系统调速策略,在不同负载、不同初始温度等工况下,对典型泵控马达系统和基于ACFC的泵控马达系统开展对比实验。实验结果表明,所建立的损失模型可实现对泵控马达系统产热功率实时估计,估计精度达到±10%,验证了所建系统产热模型的正确性;在ACFC具有一定散热裕度的条件下,提出的热管理方法可使回路温度控制精度达到±0.5℃,并降低低压回路功率消耗24.7%~66.7%,使系统总传动效率提高0.9%~3.9%,有效验证了所提热管理方法的温控及节能性能。基于ACFC的热管理方法可为静液压驱动的工程及农业装备节能控制及热管理提供一种思路及方法。

一种节能降噪的液压阀性能检测试验台液压系统

为解决液压阀性能检测试验台液压系统因溢流和节流产生的发热严重、噪音大等问题,提出将伺服电机和定量泵的组合作为液压阀试验台的液压源,通过检测液压阀的输出流量来控制电机转速。通过控制每个时间点的液压泵输出流量略大于液压阀测试所需流量来保证溢流阀的溢流作用。仿真和试验结果表明,液压阀测试液压系统可在保证正常工作的基础上实现节能和降噪,效果分别为33.6%和12.0%。研究成果可为液压试验台设计提供一定参考。

智能电机驱动技术在电泵远程监控 与维护系统中的应用

智能电机驱动技术在电泵远程监控与维护系统中的应用,标志着流体传输设备管理的重大进步。该技术通过集成传感器、通信与智能算法,实现了电泵的远程监控、故障诊断与预警,以及智能调度与优化,显著提升了系统的运行效率与可靠性。运维人员得以在远程监控中心实时掌握电泵状态,快速响应故障,有效降低了非计划停机与运维成本。然而,技术的广泛应用也面临着数据安全、设备兼容性及专业人才短缺等挑战。为此,建议加强数据加密与防护,推动标准化建设以提升设备兼容性,并加大对智能化技术人才的培养与引进力度。通过这些措施,将进一步推动电泵系统的智能化升级,为行业的高质量发展贡献力量。

基于自适应模糊PID的连续管作业机注入头速度控制研究

连续管作业机工作过程中起/下管速度控制主要依赖手动调节注入头泵的排量、马达压力等。为解决操作复杂、自动化程度低等问题,将连续管作业机注入头液压系统简化为闭式泵控马达系统,将传统手动控制方式改进为自动控制方式。分析泵控马达系统的工作原理,在AMESim中构建泵控马达系统的液压仿真模型;利用MATLAB/Simulink设计出AMESim仿真模型的PID及自适应模糊PID控制模型,从而构成整个系统的闭环控制联合仿真平台。采用PID算法及自适应模糊PID控制算法对系统响应进行仿真分析。结果表明:采用自适应模糊PID控制方式后,液压模型的响应速度更快、无超调和滞后现象、稳态误差更小,泵控马达系统具有良好的动态特性。

LS-2600五缸钻井泵设计与应用

针对现有应用于超深井、复杂井石油开采的三缸钻井泵存在的效率低等问题,研制了一种大马力、单电机、五缸钻井泵。通过变频电机的选型,设计了与之匹配的减速箱、动力端总成及液力端总成,并配置有控制系统、喷淋系统、动力端润滑系统和在线监测系统,从而实现钻井作业。通过样机试制、厂内型式试验及胜利油田工业性试验,对五缸钻井泵性能、稳定性和可靠性进行充分验证,试验期间设备运行良好、性能可靠、各系统稳定可靠、各项参数均满足设计要求。试验表明,该五缸钻井泵对钻井提速提效、节能减排、井下压力安全控制等效果显著,具有较好的市场前景及推广价值。

泵控液压系统中马达转速稳定控制及仿真分析

泵控液压马达系统中,由于外负载突变会导致发动机转速变化,进而引起变量泵转速改变,最终造成液压马达转速波动量过大及调整时间过长。针对变量泵-定量马达闭式液压系统,构建数学模型,得到传递函数框图,分析负载变化导致马达转速波动的原因。提出一种前馈补偿控制方法,通过实时改变变量泵的斜盘摆角来补偿变量泵转速扰动而引起的流量变化。推导补偿函数,并分别对阶跃100%负载、阶跃20%负载工况及斜坡100%负载、斜坡20%负载工况进行仿真。结果表明:增加前馈补偿控制后,马达转速波动量最大减少了3.87%,调整时间最多缩短了1.77 s。

基于AMESim和Simulink联合仿真的定量泵-变量马达系统转速控制研究

本文使用了AMESim和Simulink软件构建了定量泵-变量马达系统仿真模型,用于定量泵-变量马达系统的分析,并采用Simulink为主的联合仿真方法。进行了PID和模糊PID两种控制策略的比较研究。结果表明,与传统PID控制相比,模糊PID控制策略在系统响应时间和稳定性方面表现更出色,尤其在恒转速控制方面表现更佳。

国内某抽水蓄能电站发电电动机通风系统改造

国内某抽水蓄能电站发电电动机定子绕组端部通风冷却效果不佳,温升偏高,长时间运行会引起线棒绝缘加速老化。笔者对定子绕组端部温升偏高的原因进行分析,提出通风系统改造方案,并采用经典网络法和CFD流体解析法对通风系统改造方案进行分析。试验结果表明,改造后定子绕组端部温升大幅下降,改造效果显著。该改造实践结果可为类似机组通风系统设计提供一些借鉴。

采用AC0.69k V为市域线远距离低压电动机配电的应用研究

分析了市域线区间内电动机负荷采用AC 0.69 kV(660 V)供电的可行性与经济性。AC 0.69 k V(660 V)为规范规定的标准电压,低压相关元器件均可在0.69 kV系统中正常运行,其实际运用案例在我国工业领域已数不胜数。研究表明,AC 0.69 kV应用于市域线电动机配电领域是可行的;可选择合适的负荷,由AC 0.69 kV供电,其他负荷的配电方案可按常规的AC 0.4 kV方式供电,2种方案可并行;各市域线项目应根据工程投资估算确定远距离电机配电方案。当负荷的距离及容量合理时,AC 0.69 kV可显著减少工程的总投资。

The Design of a Mobile Phone-Based Remote-Control Application to Submersible Motor for Effective Water Supply

In the last few decades, several monitoring systems integrated with water level detection have been the major research focus. Production boost and its sustainability depend mainly on sustainable water supply, measuring water level, and avoiding waste of water is an essential task for all stakeholders. Therefore, the aim of this paper is to design and implement a mobile phone-based remote control. This will be applied to control the operation of a submersible motor in a water tank. The water level in the tank is detected and the device remotely turns the motor pump on/off. The design process is accomplished by developing an android application that works on GSM technology to manage the filling of water tank. An AT89C51 microcontroller is used for the desired programming. At the transmitting end, sensor is used for level detection and GSM module is used to send the information to user. According to this information, user controls the on/off operation of the pump. A SIM card is required for its operation and it works on attention (AT) commands. After the design and implementation of the device, the test results showed that all features of the device worked properly, and the device functions exactly as expected. More significantly, the paper has shown that ultrasonic sensors can be used to determine the level of water in a water tank and a GSM module can be used to control a submersible pump. The design and implementation of this device can help to reduce waste of time and power. Ultimately, it avoids water wastage thereby ensuring availability, conservation, and sustainability of water supply.

变转速泵控马达自抗扰控制

变转速泵控系统具有动力学阶数高、强非线性、参数时变等控制难点。建立了交流永磁同步电机驱动的变转速泵控马达系统的完整数学模型。在模型简化的基础上,引入串级系统的思想设计自抗扰控制器。通过PID控制和自抗扰控制的对比仿真研究,验证了自抗扰控制器的控制性能。仿真结果表明,自抗扰控制器能较好克服系统阶数降低的影响,不但在基本恒定负载下响应快、跟踪精度高,而且在突变力矩干扰下时,展现出较好抗干扰能力。

HMCVT泵控马达系统模糊PID控制研究

【目的】为减少由于HMCVT泵控马达系统响应迟滞以及遭受负载扰动时波动剧烈,使得拖拉机不能稳定在目标车速上的问题。【方法】以HMCVT泵控马达系统为研究对象,建立了泵控马达系统的数学模型,运用模糊PID算法对马达转速进行控制。针对标准鲸鱼算法易陷入局部收敛的问题,引入非线性变化、动态惯性权重以及遗传变异思想进行改进,并运用于PID参数的整定。【结果】以建立的传递函数为测试对象,改进后的WOA算法只需要迭代9次便能寻得最优解,相较于改进前减少了7次迭代,ITAE值降低了16.83%。相较于标准鲸鱼算法整定的模糊PID控制器,改进后的鲸鱼算法整定的模糊PID控制器在阶跃响应下系统最大超调量降低83.3%,调整时间减少0.759 s;正弦响应下最大误差减少16.41 r/min,降低了55.44%;斜坡响应下最大误差减少31.39 r/min,降低了44.58%;负载突变时最大速度减少2.2 r/min,降低了2.01%。采用试验设计的模糊PID控制器能有效实现HMCVT液压马达的变速跟踪控制,提出的改进鲸鱼算法能提高响应精度,降低误差。【结论】研究结果为装备HMCVT的拖拉机的最优经济性控制与最优动力性控制提供理论参考。

大型泵站主电动机滑动轴承水冷却系统比较

为比较大型泵站主电动机滑动轴承不同水冷却系统优缺点,对滑动推力轴承和导轴承发热量和传热进行计算,根据轴承温度控制条件,求得最小需要冷却水流量与进水温度的关系.介绍了传统供排水、盘管、板式热交换器和冷水机组4种水冷却系统,计算该4种水冷却系统运行能耗,并进行综合比较分析.研究结果表明:传统供排水冷却系统能耗大,泵吸水管口易堵塞,油冷却器内壁易结垢;与传统供排水冷却系统相比,盘管式水冷却系统节能22.9%,无堵塞、结垢问题;板式换热器冷却系统节能45.5%,节能率最高,但仍存在堵塞、结垢问题;冷水机组冷却系统节能39.6%,节能率次之,但具有节能、不结垢、无进水口堵塞问题和运行维护方便等综合优势.