高精度磁铁稳流电源智能化接口的研制

介绍一台专用于高精度稳流电源的智能化接口的设计方案及样机的研制结果。该接口用单片机作为核心实现对大功率、高精度的磁铁电源进行智能化的本地控制与作为远程遥控接口的功能。具有运行参数的设定、运行状态的检测、故障报警及记录、运行数据的保存及与计算机的通讯等功能。采用了主控机箱与操作面板分离的两体方案,主机与面板之间用串行数字信号进行连接。     

The effect of magnetic and optic field in water electrolysis

Hydrogen production via water electrolysis was studied under the effect of magnetic and optical field. A diode solid state laser at blue, green and red were utilized as optical field source. Magnetic bar was employed as external magnetic field. The green laser has shown a greatest effect in hydrogen production due to its non-absorbance properties in the water. Thus its intensity of electrical field is high enough to dissociation of hydronium and hydroxide ions during orientation toward polarization of water. The potential to break the autoprotolysis and generate the auto-ionization is the mechanism of optical field to reveal the hydrogen production in water electrolysis. The magnetic field effect is more dominant to enhance the hydrogen production. The diamagnetic property of water has repelled the present of magnetic in water. Consequently the water splitting occurs due to the repulsive force induced by the external magnetic field. The magnetic distributed more homogenous in the water to involve more density of water molecule. As a result hydrogen production due to magnetic field is higher in comparison to optical field. However the combination both fields have generated superior effect whereby the hydrogen yields nine times higher in comparison to conventional water electrolysis.     

基于预测函数控制和扰动观测器的永磁同步电机速度控制

设计了基于预测函数控制的速度控制器,以减小永磁同步电机的转矩波动,提高电机的转速控制精度。针对因外部扰动因素引起的控制器跟踪性能下降问题,设计了基于预测函数控制和扰动观测器的双环控制器;通过扰动观测器估计系统扰动,并据此产生转矩电流补偿量对控制量进行前馈修正,从而实现扰动的抑制。实验结果显示：当电机从静止跟踪到设定600 r/min转速时,系统没有超调,稳态精度为2 r/min;当电机以600 r/min稳速运行并加入1.6 N·m的转矩扰动时,转速最大波动为5 r/min。与传统的PI控制算法相比,所设计的控制器使转速波动减小了4.2% 。仿真分析和实验数据表明：基于预测函数控制和干扰观测器的控制器能够有效地抑制扰动,提高系统转速跟踪精度。     

多新息模型辨识PMSM双曲正切滑模定位控制

永磁同步电机伺服系统是一个复杂的非线性系统,模型参数、摩擦等因素使其难以用准确的数学模型表示.针对永磁同步电机伺服系统存在不确定参数、摩擦及外部扰动现象,提出一种基于多新息模型辨识的双曲正切滑模定位策略.首先,将永磁同步电机的模型进行状态离散化,并用多新息模型辨识方法对系统的模型参数进行辨识;然后根据离散化的辨识系统状...     

Innovative design of a magnetocaloric system

In the present paper we consider the problem of optimizing the cooling of a magnetocaloric refrigerator. In this work we first theoretically and then experimentally study the performance of a single material regenerator under different operating conditions. The basic principles of the design and implementation of our magnetic refrigerator prototype are presented as well as a new magnetic assembly of NdFeB permanent magnets.

The design of the equipment uses a movement of relative displacement optimized for the phases of activation and inactivation of the magnetic field. Each part of the equipment is implemented in order to be controlled separately and to allow a large variety of the tests: gear pumps with individual control, sequence of programmable magnetocaloric cycle, unit control by programmable controller and application programming interface by color LCD touch screen, real-time processing data acquisition using a National Instruments System implemented on Independent PC, expelled heat using different standard heat exchangers.     

紧凑型脉冲磁场发生装置研制

研制并测试一套紧凑型脉冲强磁场发生系统,包括一套1mF/8kV高储能密度电容器电源、两台脉冲磁体和一套监控系统。系统分别在27mm和45mm的大孔径内产生最高为20T和10T的脉冲磁场。     

基于串级无模型自适应的外传子永磁同步电机跟踪控制

为解决现有煤矿皮带机传动系统占地空间大、传动效率低、维护频度高等问题,提出一种外转子永磁同步电机(outer-rotor PMSM)直接驱动结构,并将一种串级结构的无模型自适应控制算法应用到皮带机驱动电机的速度控制中。根据矿井皮带机的运行要求,给出该电机详细的设计参数和数学模型,设定了启动和稳态时的理想速度曲线。利用无模型自适应控制算法设计出串级无模型自适应控制律,并给出串级控制系统结构图。通过Matlab软件对外转子PMSM在煤矿皮带机的直驱伺服系统按照理想的启动“S”型曲线进行仿真,其结果表明：串级无模型自适应控制算法降低了速度跟踪误差,提高了调速控制精度,有效地抑制了系统噪声和负载变化带来的干扰,实现了皮带机良好的启动和稳态特性。     

永磁同步电机多采样率EKF转速辨识

永磁同步电机（Permanent Magnet Synchronous Motor,PMSM）具有响应快、高精度、高转矩比等诸多优点,同时无传感器控制策略研究能有效提高PMSM系统的简易性和鲁棒性。在分析EKF和多采样率数字控制系统的基础上,建立永磁同步电机输入多采样率EKF算法,将其用于转速估计。通过仿真和实时实验验证其算法在辨识精度及收敛稳定性方面均优于单采样率EKF算法,并和高频单采样率EKF有着一致的辨识效果,而多采样率EKF算法的数据量及运算量均小于高频单采样率EKF。     

上海同步辐射装置电源控制系统

上海同步辐射装置电源控制系统是基于EPICS系统开发运行的分布式控制系统。系统中~65 K实时数据库记录分布运行于27个VME总线的IOC控制器中,实现了对600多台各类磁铁电源的访问控制。本文介绍了电源控制系统基于Ethernet的层次式结构与工作原理,分别描述了针对PSI与SINAP电源控制器的控制解决方案,同时介绍了系统的硬件设备、IOC和控制台软件及系统中采用的通讯技术。     

基于无速度传感器电阻辨识系统的研究

永磁同步电动机对于内、外界扰动表现极为敏感,尤其是电动机电阻大小的变化,为提高电动机系统的鲁棒性,引入自适应法辨识电阻方法。在电动机参数已知的前提下,把定子电阻当作未知参数进行辨识,定子电流和转子磁链作为状态变量,建立电阻辨识的自适应观测器。在相同仿真条件下,对引入电阻辨识和没有引入电阻辨识的直接转矩控制系统进行研究,结果证明所设计的自适应法辨识电阻,能有效提高电动机系统的鲁棒性。