磁矩

The dips deriving from transformer energizing can be distinguished via ST contour easily, and the dips caused by faults or motor inductions are classified using corrected first central moment and phase angle curve of amplitude envelope vectors from S-matrix.

利用S变换时频等值线图可以容易地识别由变压器激磁引起的电压凹陷；对于由各种故障和感应电机启动引起的凹陷，通过求取S矩阵幅值包络向量的修正一阶中心矩和相位变化曲线实现了分类。

Its thought is to change the model of the asynchronous motor through the coordinate, make it become direct current motor model, divided the electric current vector of the stator into according to the weight of two pieces of direct current with directional magnetic field of the rotor and controls, realize magnetism coherent and torque solve lotus root control , in the hope of the control result of the direct current reaching machine.

其思想就是将异步电动机的模型通过坐标变化，使之成直流电动机模型，将定子电流矢量分解为按转子磁场定向的两个直流分量并分别加以控制，从而实现磁通和转矩的解藕控制，以期达到直流电机的控制效果。

The biased magnetomotive forces generated by the permanent magnets were superimposed on the coil control magneto-motive forces to act on the rotor, making the solenoid produce bidirectional output torques proportional to the coil excitation currents.

永磁体产生的偏置磁通与线圈产生的控制磁通形成差动磁场作用于衔铁转子，使电磁铁输出与控制电流成比例的双向转矩。

The engine main circuit have to be gurranteed drawing the torque of electric motor and rotation speed wholly to do regulateing of independence ,But also possess extensive setting range SS7's mould electric locomotive adopts Quan Kongqiao and semi bridge accuseeing series connection to make up the monophase bridge style commutation electric circuit ,The coil power supply is encouraged against the stringtrain by the electric motor the drawing armature to 3 parallels operation ,Still there is an excitation commutation bridge ,He encourages the coil power supply with 3 electric motors drawing together to the series connection ,Moreover has one another accuses the regulating action .

机车主电路必须保证牵引电动机的转矩和转速都可作独立的调节，而且要有宽广的调节范围。SS7型电力机车采用一个全控桥和一个半控桥串联组成单相桥式整流电路，向3台并联工作的牵引电动机电枢与串励绕组供电，还有一个励磁整流桥，向串联在一起的3台牵引电动机他励绕组供电，并具有相控调节作用。可以实现机车无级调速和无级削磁。SS7型电力机车采用再生制动方式，再生制动时，牵引电动机作直流发电机工作，并且将电能馈送回接触网，此时电力机车相当于一个移动的发电站。

The speed-sensorless vector control and the identification of motor parameters in this paper are the two novel research of vector control.Using asynchronous machine's mathematic model in three-phase static reference frame, this paper has derived it's mathematic model in two-phase static reference frameand in two-phase rotating reference frame, and got the coordinate transformance formulus based on the constant magnetic force and power force, by compared different field orientation methods, we can find that field orientation at rotor field can realize the decoupling of the stator current flux component

无速度传感器矢量控制和电机参数辨识是矢量控制的两个新的研究方向，本文利用异步电机在三相静止坐标系下的数学模型推导出两相静止坐标系、两相同步旋转坐标系下的数学模型，根据磁动势守恒和功率守恒的原则，得出各坐标变换公式；通过不同磁场定向方式的比较发现，异步电机按转子磁场定向时定子电流励磁分量和转矩分量可以比较方便地实现解耦。

In this paper, the working principle and magnetic network model of two-phase hybrid stepper motor are introduced, the magnetism chain equation of the winding and electromagnetism torque equation is deduced.

本文介绍了两相四拍混合式步进电机的工作原理和磁网络模型，推导了绕组的磁链方程、电磁转矩方程。

Switched reluctance motors ; modifying factor ; arc-tangent function ; flux linkage model ; torque model

开关磁阻电机；修正因子；反正切函数；磁链模型；转矩模型

Based on the magnetic field calculation some parameters of the sample motor such aselectromotive force with no load, leakage coefficient with no load and magnetictorque are calculated and influence on the parameters that is caused by the change ofthe structure of the sample motor is also discussed.

在电磁场计算的基础上，进行了电机空载反电势，空载漏磁系数，电磁转矩等相关参数的计算，讨论了横向磁通永磁同步电动机的结构变化对参数的影响。

Results of the experimentation compared with the simulation exhibited superiority of the stator current and pull-in torque, therefore the new hybrid motor should be more valuable in practical applications.

实验测试的数据以及仿真的结果表明，在稳态电流与同步牵入转矩方面的性能与磁滞电机相比永磁磁滞同步电机的性能有明显的改善，它是一种很有实用价值的新型电机。

A brief introduction about the structure and foundamental rotation theory of switch unit in switched reluctance motor is given.

在线性模式的基础上，对开关磁阻电机的转矩进行了理论分析和计算；由此提出了开关磁阻电机的两种控制方式：低速斩波控制和高速单脉冲控

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。