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Using the strategy,the pure integration and stator leakage inductance are removed from the reference model.Then the low speed performance is improved.Simultaneously,As to the stator resistance identification,the accuracy of speed observation is increased and the rotor resistance can also be identified.

该方法消除了纯积分和电机漏感对算法的影响，电机的低速性能得到了改善；同时，对定子电阻进行在线辨识，从而得到准确的转速观测结果，也能近似地辨识转子电阻。

In this thesis, synchronous motor soft-start system based on variable reactance technique is studied .

本文所设计的是基于磁控电抗器技术的异步电机软起动控制系统，为实现交流异步电机的软起动而研究开发。

With the id￠=0 vector control and the feedforward compensation of cogging, the minimum force ripple and maximum efficiency control of non-sinusoidal BEMF SPM motors can be obtained.

考虑永磁磁链谐波对永磁磁链导数矢量幅值及相位的影响，通过引入d￠q￠轴坐标系，提出一种id￠=0的非正弦波BEMF SPM电机矢量控制新方法，结合齿槽前馈补偿可以实现非正弦BEMF SPM电机的最小推力纹波最大效率控制。

To fine reasonable solution, in Chapter 3, its stable state stability has been analyzed in detail, including in the self-excited mode and external-excited mode separately.

在比较各种调速方法的基础上，首先对交流励磁变速电机的应用前景进行了分析，并分析了交流励磁变速电机的研究现状。

The performance of piezoelectric materials affects and restricts the development of ultrasonic motors to a great degree.

压电材料是超声电机的核心，压电材料性能的优劣在很大程度上影响和制约着超声电机的发展。

Cogging torque is one of the most important parameters of PM motors,which causes torque ripple,vibration and acoustic noise.

齿槽转矩是永磁电机最重要的参数之一，它的存在会造成电机的转矩波动、振动和噪声。

When the air usage volume is small, the coiling temperature and noise of motor do not exceed the allowable scope

在用气量小的情况下，应保障电机绕组温度和电机的噪音不超过允许的范围。

Developing a new type ironless PM motor requires accurately calculating the performance parameters. An important prerequisite to this purpose is the acquirement of correct magnetic field distribution.

开发无铁心永磁电机需要准确计算电机的参数和性能，而实现这一任务的重要前提是获得正确的磁场分布。

This instrument is designed to measure, compute and analyse the triphase voltages and currents, without mechanical characteristic, temperature, noise and magnetic field etc.

论文设计的装置主要完成对电机三相电压电流等电参数的测量、计算和分析，而不涉及对电机的机械特性、温度、噪声、磁场等测量。

However there is no satisfactory method a vailable to test torque speed curve of large power permanent magnetic motor.

电机的多项重要指标是否达到设计要求需要通过测试电机的转矩-转速曲线的结果来验证。

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。