查询词典 magnetic performance

ABSTRACT Aiming at problems of trans-vector controller in a vehicle-carried induction motor such as variable rotor and stator resistance following motor temperature, and their inductance varying with flux saturation degrees. Firstly, CSI and VSI are introduced, for CSI, it can hold the advantages both FOC and DTC using stator flux directional, PI parameter and simulation are also introduced. Secondly, equations of IM in the synchronous rotary frame and its static counterpart, as figuring in the saturation condition of magnetic field, are dealt in this paper and the simulation results are presented. Thereafter, the parameter designing of PI trans-vector controller is processed, which features the non-linear model. In practical realization, as neglecting the dynamical change of motor inductance, this paper employs online modification of inductance parameters, according to the flux saturation, then transforms the non-linear equations into linear ones, and so compacts the structure of controller. Thirdly, in view of the maximum torque output is extraordinary requisite when Electrical Vehicle start up, accelerate, and overtake, this paper issues the maximum torque when both inverter and battery capacity is corporeally definite. Fourthly, on-line differentiating and analyzing both rotor's time constants and its flux by using the expanding order reduction and discrete Kalman filter equation are fathomed, in order to realize high-performance trans-vector algorithm, and also the simulation results are presented. Fifthly, the close-loop regenerative brake system, when the EV's torque is set constant, is deduced; at the same time, unification of electric drive model and brake model is executed. Combined with maximum charge current demands, the mathematical model for online yielding torque as a demand.

本论文针对车载异步电机在矢量控制器所遇到的问题：定转子电阻随温度变化及随电机饱和程度变化的转子电感及定子电感而影响电机调速性能提出一套完整的解决方案：分析了电流型逆变器和电压型逆变器在实现矢量控制时控制器参数的计算，分析出对于电流型逆变器在采用定子磁场定向时，其性能同时具有矢量控制和直接转矩控制两者的优势，并对电压型逆变器在转子磁场定向下的模型进行了仿真研究；建立异步电机非线性模型，推导出考虑磁饱和时异步电机在同步旋转坐标系及静止坐标系下的方程，并做出了仿真结果，建立异步电机在非线性模型下的矢量控制调节器的PI参数设计，在实际应用中，若忽略电机电感的动态变化，可以根据当前的磁路饱和状态而在线修正电感参数，从而将非线性方程线性化，降低控制器的复杂度；考虑到电动汽车在起动和加速超车时需要电机有最大转矩输出，本文讨论在逆变器容量一定和电池供电能力有限的情况下电机最大转矩输出问题；推导了异步电机扩展降阶、离散卡尔曼滤波方程在线辨识转子时间常数和转子磁通，用于实现高性能的矢量控制算法，并给出了仿真结果；推导出了电动汽车恒转矩给定的闭环回馈制动系统，实现了电动控制模型和制动模型的统一，而且结合铅酸电池最大充电电流的要求，为制动转矩在线给定建立了数学模型；设计了基于双DSP系统的高性能矢量控制器软硬件框图，并以大量实验数据说明矢量控制在电动汽车应用的实际应用状况。

The improvement of performance of HTS makes its application in magnetic levitation and other areas become easier.

同时，高温超导体性能的不断提高，为高温超导在磁悬浮及其他方面的应用开辟了广阔的前景。

Especially in high-performance oxygen to soft magnet materials and magnetic core has a strong technical force.

尤其在高性能软磁铁氧提材料及磁芯领域有着强大的技术力量。

The performance of synergistic scale inhibition was investigated in different water temperature, magnetic field intensity, water hardness and concentration.

研究了不同温度、场强度、质硬度及加药量下的协同阻垢性能。

SAE J 551-5-2004 PERFORMANCE LEVELS AND METHODS OF MEASUREMENT OF MAGNETIC AND ELECTRIC FIELD STRENGTH FROM ELECTRIC VEHICLES.

SAE J 551-4-2000 车辆装置的无线电抗干扰性能的测试和试验限制，宽带和窄带，150kHz到1000kHz，NA

Design and improvement of magnetic field are important to the performance of SPT.

磁场设计及优化对SPT性能的提高具有决定性的作用。

The simulation results show that the control systems realize decoupling between magnetic flux and torque, and transient and stable performance of the control system is all right.

论文对所设计的间接矢量控制系统进行了MATLAB的建模与仿真，仿真结果表明该控制系统实现了磁通与转矩解耦，系统的静、动态性能良好。

Magnetic hysteresis is the intrinsic characteristic of MR dampers, which will have more serious effect on the performance of MR dampers.

本文对MR阻尼器的固有特性磁滞效应对控制效果的影响进行了研究。

When the resistance force is large, magnetic hysteresis will have more serious effect on the performance of MR dampers.

文中将该模型分别与两种控制方法（LQR控制方法和模糊控制方法）连接，形成了MR阻尼器的智能控制。

With the development and utilize of electric energy, the applications of soft magnetic material are more and more wide and the performance is concerned more and more by the researcher.

随着电能的开发和利用，与其相关的软磁材料的应用越来越广泛，其性能的好坏也越来越受到科研工作者的关注。

Chrysanthemum of 10 thousand birthday is lax to edaphic requirement, with the arenaceous qualitative loam with fecund, good drainage had better.

万寿菊对土壤要求不严，以肥沃。排水良好的砂质壤土为好。

He unstepped the mast and furled the sail and tied it.

他拔下桅杆，把帆卷起，系住。