磁矩

A simulation with MATLAB/Simulink is carried out, simulation results show that it effectively reduces the pulsation of torque and magnetic flux linkage.

通过MATLAB/Simulink对该系统进行仿真，仿真结果表明：空间矢量脉宽调制直接转矩控制能够有效地减少电动机转矩和磁链的脉动。

The motor s physics process in the changing of magnetic store energy and mechanism and parameter calculation in the self inductance, mutual inductance, magnetic flux linkage and electromagnetism torque is discussed in such respect of multi return and electromagnetism torque theory.

从多电流互感回路理论出发，以电磁转矩这一机电耦合项为依据，讨论电机的磁场储能与机械能相互转换的物理过程、隐极电机的电流回路中自感和互感参数计算、磁链方程及电磁转矩计算

In the implementation of the DTC method, two hysteresis comparators are used to control the magnetic flux and torque, and the switching of the inverter is decided by a optimized switching table.

控制系统采用磁链及转矩滞环比较方法得到控制量，并通过查控制电压开关表选择最优电压空间矢量的方法实现对电机的直接转矩控制。

This dissertation analyses the mathematical model of the induction motor and its dynamic behaviour and points out that the key of realizing DSC is to choose stator voltage vectors reasonably according to the request of the flux and torque.

通过对交流异步电动机数学模型及动态形为的深入分析，指出实现直接转矩控制的关键是要根据磁链和转矩的要求，合理地选择定子电压矢量。

The realize method of ITC strategy in FSTP induction generation system is studied. In order to improve stable performance of FSTP induction generation system, SVM-ITC (ITC based on space vector modulation) is investigated. Creation method of reference voltage vector which includes change trend and magnitude information of flux link and torque is presented. Because there is no zero voltage vector in four-switch system, a method which employs opposite vector in equal time to replace zero voltage vector is proposed. Two vector modulation schemes are presented.

为提高容错型四开关三相异步发电系统的稳态性能，进行了基于空间矢量调制的瞬时转矩控制研究，提出了包含磁链与转矩变化趋势与大小信息的电压参考矢量生成方法；针对四开关系统无零电压矢量的情况，提出用等时间相反矢量来代替零电压矢量的作用，并给出了两种矢量调制方案。

Direct torque control has excellent dynamic performance, but it has large ripple on stator flux and electromagnetic torque.

直接转矩控制系统具有良好的动态响应，但转矩及磁链的脉动较大。

Result of theoretical analysis and simulation indicate that bang-bang controller will result in torque ripple. 3. Through analyzing relationship between voltage and flux in induction motor, a stator flux oriented voltage vector control scheme is proposed.

对砰—砰控制的机理和实质加以论述，通过分析和仿真说明，无论是电流、磁链或是转矩的砰—砰控制都将引起转矩的脉动。

The principle of TDTC and the field-weakening method are introduced. The space voltage vector PWM overmodulation method suiting is adopted. IDTC is extended to the whole speed range. This scheme is proved by experiments.

本文介绍了改进型直接转矩控制的基本原理，加入弱磁控制算法，同时采用一种适合工程应用的空间电压矢量PWM过调制算法，将改进型直接转矩控制扩展到全速度范围。

Permanent Magnet Synchronous Motor drived by triphase sinusoidal current is research object in this paper . Its mathematics models in several coordinate are set up , controlling principles of flux linkage and torque are discussed under DTC and the block diagram of PMSM with DTC is presented.

本文以三相正弦波驱动的永磁同步电机为研究对象，建立了其在不同坐标系下的数学模型，并深入探讨直接转矩控制中永磁同步电机的磁链和转矩的控制思想，给出控制方案。

Permanent magnet synchronous motor drived by triphase sinusoidal current is research object in this paper. Its mathematics models are set up and the different control menthods are discussed, controlling Principles of flux linkage and torque are discussed under DTC and the block diagram of PMSM with DTC is Presented. At last the control mothod is proved correct using MATLAB simulation software.

文章以二相正弦波驱动的永磁同步电机为研究对象，建立了永磁同步电机的数学模型，对于不同的控制策略进行了对比分析，并深入探讨直接转矩控制中永磁同步电机的磁链和转矩的控制思想，给出控制方案，最后利用MATLAB仿真工具验证了控制方案的正确性。

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。