磁路

The position of permanent magnet, optimum length of axial field coil and choosing principle of iron core length are discussed.

然后提出了混合磁路多边耦合电机的方案，即在永磁感应子式步进电动机上增设一套轴向励磁线圈以对永磁体磁场进行补偿。

Besides, numerical simulation of electromagnetic field of permanent magnet retarder was analyzed, and the design theory and method of permanent magnet retarder was studied.

主要研究内容和取得的结论包括： 1、永磁式缓速器磁路计算理论的研究。

Ultrasonic wave motor is s new motor according to the principle of that to get turning force from ultrasound oscillation.It differs from traditional motor due to it is without winding and magnetic field.

与传统的电机不同，超声波电动机没有绕组和磁路，是一种由超声振动而得到旋转力的新原理电机，有驻波与行波两种驱动方式。

In new structure, magnetic field in winding window area is distributed more uniform than that of simple lumped air-gap structure, resulting in reduction of AC winding loss greatly.

新结构通过在开集中气隙的高磁导率磁芯柱与线圈间加入低磁导率磁材料，为电感器的磁压分布构造一辅助磁路，进而使电感器线圈窗口内的磁场分布均匀化，大大减小了线圈涡流损耗。

The designs of the gap and the orifice vane MRF dampers for the vehicle are introduced. According to one of the primary gappy one s deficiencies compared with the orifice one that the magnetic flux density in the gap isn t strong enough,the design of three phases vane MRF damper with tangent magnetic core is proposed.

介绍了车用缝隙式阻尼型和孔式阻尼型叶片MRF减振器的磁路设计方案，并针对缝隙式阻尼型相对于孔式阻尼型间隙处磁感应强度小的不足，提出了采取切向放置铁芯的三阶段叶片式MRF减振器的设计。

The existing methods for megnetic circuit analysis include analytic method,graphic method,and numerical method,etc.

目前求解磁路的主要方法有：解析法、图解法、数值计算法。

Unlike the gravitational acceleration, the magnetic acceleration is a location-dependent variable and its magnitude and direction vary with the magnetic circuit configuration.

与重力加速度相比，磁加速度是一个依赖于空间位置的变量，其大小和方向随外磁场的磁路布置发生改变。

Guide magnet small displacement influence is passed to change on distribution of carity magnetic field. The relationship between Hall voltage and displacement function is determined.

通过导磁铁微移动影响腔体磁路变化确定了霍尔电压与位移函数的关系，计算出了K值。

The dynamic microphone consists of diaphragm, induction coil and magnet system design.

动圈式麦克风组成主要为振膜、感应线圈与磁路。

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。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。