磁通

This is the closed loop of vector control system using speed sensor.

这是一个有速度传感器的闭环矢量控制系统，观测转子的磁通，提出了磁通观测器和电机解耦控制的结构，建立数学模型，并且用计算机仿真实验证实该控制系统动态特性良好，并对定转子电阻变化具有鲁棒性。

According to the demand of high magnetic field power supply, reference is increased with a set ramp rate and stops at a set stable value, so reference system is composed of digital setting and digit to analog converting circuit. But the stability of reference is mostly guaranteed by the performance of D/A circuit, so D/A circuit is particularly studied in reference system. The scheme of D/A circuit, the selection of DAC and its voltage reference, hardware anti-jamming design and PCB design are discussed in detail, and software of remote control and PLC are discussed in brief. Zero-flux DC current transformer well satisfies the demands of the high stability of Load current detection unit, so the principle of zero-flux DC current transformer is analyzed; in the mean time a project which detects the long term stability is designed. During 8 hours, analog signal which is detected with high precision digit multimeter is recorded in computer at 1HZ frequency by GPIB communication. The drift error source and related parameters are explained in the compare-amplify part. Detailed subtraction circuit is designed; also amplifier chip and periphery components are selected and verified according to the theory of error analysis.

根据强磁场电源的需求，参考源应按照软件设定的斜率逐渐上升到设定稳态值，则参考源系统应由数字给定和数模转换电路两大部分组成，而参考源的稳定度主要依靠完成数模转换功能的模拟电路的性能来保证，因此本文对参考源系统的研究以数模转换电路为重点，分别从电路方案的确定、数模转换芯片及其基准电压源的选取和验证、电路板硬件抗干扰和PCB设计几方面进行了论述，然后对数字给定部分的远控组态和PLC程序设计作了简要介绍；采用零磁通原理的直流电流转换器很好地满足了对负载电流检测单元高稳定度的需求，本文详细分析了零磁通检测的原理，并在选定此种类型电流转换器的基础上设计了一套检测长期稳定度的方案，8小时内以1秒为采样周期，通过计算机Labview程序和高精度数字电压表的GPIB通讯，将被高精度数字电压表数字化后的模拟信号采样值连续记录至计算机中；比较放大环节简要阐述了漂移产生的原因和相关参数指标，确定了具体的减法电路形式，并根据误差分析理论对运算放大器和外围元器件进行了选取和验证。

This paper introduced the basic principle of the magnetic flux vector control technique and the basic composition of it s circuit, mainly introducing the method and the control process in which magnetic flux vector control technique is used to improve the control property of big bridge crane , and to get good results.

介绍了磁通矢量控制技术的基本原理及其电路的基本组成。着重介绍了磁通矢量控制技术用于改善大型桥式吊车控制性能的方法和控制过程，以及该技术应用所取得的良好效果

This paper introduces the hardware design and software design of high accuracy digital integral magnetic fluxmeter the principle of digital integral and process.

介绍高精度智能化数字积分磁通计的硬件组成和软件结构及数字积分的基本原理和实现过程，并对磁通计的性能进行了测

On the basis of measure principle of micro-power magnetic flux used by electronic integrator,a new kind of electronic integrator whose measurement sensitivity can reach as high as is designed to against the factor of integration drift,integration time constant etc which will effect Integration output error.

在将电子积分器应用于测量微磁通原理的基础上，针对影响积分输出误差因素中积分漂移、积分时间常数等的分析，设计了一种测量灵敏度为10-9C的新型电子积分器，并将该电子积分器应用于10-7～10-8C电量微磁通测量系统中。

Using ANSYS magnetic field finite element analysis module,distributions of magnetic line of force and magnetic flux density of the magnetorheological fluid clutch are analyzed.

利用ANSYS磁场有限元分析模块分析了磁流变液离合器的磁力线与磁通密度的分布，同时对离合器外壳材料的选用和外壳形式对磁通密度大小及分布的影响进行了分析，分析结果可为同类产品的设计提供参考。

From the magnetic flux pinning we analyse the effect of the 211 particles size on the magn...

从磁通钉扎角度分析了211的粒度对磁悬浮力和捕获磁通的影响。

The method includes the following steps: depositing a non-magnetic layer (3) of sufficient thickness; anisotropically etching the non-magnetic layer to form a steep wall of suitable dimensions at the required position of a flux guide; depositing a magnetic material to form a magnetic layer (9) on the wall in such a manner that the magnetic layer has a thickness corresponding to the required track width; removing undesired deposits of magnetic material but maintaining the magnetic layer on the wall; depositing an insulating material (19a) to cover the magnetic layer.

该方法包括下列步骤：淀积足够厚度的一个非磁层(3)；非均质地蚀刻该非磁层以便在磁通引导的要求位置形成适宜尺寸的阶跃内壁；淀积一个磁性材料，以便在该内壁上形成一个磁层(9)，使得该磁层具有对应于该要求的磁迹宽度的一个厚度；去除不希望的淀积的磁性材料而保持在该内壁上的磁层；淀积一个绝缘材料(19a)以便覆盖该磁层。

E. thickness of the copper wire wall, length of the single conductor wire, height of the solenoid, the exciting current and the current density, the working temperature of the conductor, time of exciting and demagnetizing, the cooling water pressure and flux density, etc..

所建立的数学模型包含3个目标函数（即能耗极小化目标函数、铜耗极小化目标函数和纯铁用量极小化目标函数）、7个设计变量（即铜管规格参数a、b、t，线圈匝数N〓、N〓，铁铠磁通密度B〓和冷却水压p）和8类14个约束条件（即铜管壁厚、单饼导线长度、螺线管高度、激磁电流与电流密度、导体工作温度、激退磁时间，冷却水压和铁铠磁通密度等约束条件）。

As a result, the equivalent magnetic flux leakage coefficient and the equivalent air-gap magnetic flux density calculating coefficient, which are important for the motor design, are put forwar.

分别对其气隙磁通密度沿周向和轴向的分布进行了分析研究，提出了该种电动机所特有的等效漏磁系数和等效气隙磁通密度计算系数的概念和计算方法。

In the negative and interrogative forms, of course, this is identical to the non-emphatic forms.

。但是，在否定句或疑问句里，这种带有"do"的方法表达的效果却没有什么强调的意思。

Go down on one's knees;kneel down

屈膝跪下。。。下跪祈祷