查询词典 electromotive force

The static and dynamic performances of BLDCM were simulated,and the back electromotive force,phase current,torque and speed curves were demonst...

该模型准确易行，便于替换和修改，为今后分析该类电机和对其控制策略的研究提供了新的方法。

The thesis first probably explains BrushLess Direct Current Motor, and discusses the related control methods, explains the background and Meaning of back electromotive force which is used in the thesis.

本文首先对无刷直流电机进行了概述，并对其相关控制方法进行了讨论，说明本文所采用反电动势法的背景和意义；接着论述了无刷直流电机基本组成环节、基本工作原理、运行特性和传递函数，然后是详述本文研究的重点：基于反电动势法的MATLAB调速系统的仿真以及基于反电动势法的DSP控制系统的实现。

According to the fundamental of vector control,a digital closed-loop control system of permanent magnet synchronous motor based on dsPIC30F6010 was designed and a model of permanent magnet synchronous motor in the estimation two phase rotating reference frame was introduced and an extended back electromotive force equation was deduced.

根据永磁同步电动机矢量控制的基本原理，设计了一种基于 dsPIC30F6010的无位置传感器永磁同步电动机控制系统，并介绍了在估算两相旋转坐标系下的PMSM模型，推导出了反电势方程的扩展形式。

To overcome these two deficiencies in the existed system, the back electromotive force shape function method is proposed to realize the real time calculation of phase voltage and make the estimation of torque easer.

最后给出的仿真与实验结果证明了反电势形状函数法用于无刷直流电机直接转矩控制中的可行性与有效性。

A back electromotive force observer is constructed to acquire the information of speed as well as acceleration. By selecting the time constant or observer gain properly, the current command reduction characteristics can be adjusted freely in some range.

其中的反电动势观测器能方便地获得速度和加速度信息，通过适当调整观测器的时间常数和增益，就能使驱动电流指令值在一定范围内自由调解以达到控制目的。

Back electromotive force between two carbon electrodes , together with the wittibility of electrodes by the cryolite-alumina melts were studied in a walles cell with continual pulse technique.

本文采用连续脉冲技术，在观察无壁电解槽中电解质对碳电极湿润性的同时测量了两极间的电动势。

On the base of roundly analyzing and studying the running mode of the sensorless BLDCM, we explain theories and realizable methods of detecting back electromotive force, phase verdict and phase compensation in detail.

在全面分析研究了无位置传感器无刷直流电动机运行方式的基础上，细致阐述了反电势过零检测、相位判断及相位补偿的原理及实现方法，并且为了在较宽的范围内提高BLDCM的调速性能，采用了数字式转速闭环控制。

The flux observer can ensuring flux linkage to be perpendicular to back electromotive force,so that the stator flux linkage can be estimated accurately over a wide speed rang.

观测器从确保磁链和反电势正交的角度出发，保证了电机在宽运行范围定子磁链观测的准确性。

In order to eliminate direct current drift and saturation problems of pure integrator for back electromotive force,an improved programmable low-pass filter rotor flux estimator was proposed to replace the pure integrator.

为了有效抑制反电动势积分环节所存在的直流偏移和积分饱和问题，采用一个截止频率可根据输出频率进行自调整的低通滤波器来代替传统电压模型磁链观测器中的反电动势积分环节。

When a rotating voltage vector is injected to the motor at standstill, there is a microinching when the voltage phase is line to the direct axis of the motor. Then the current will decrease due to the back electromotive force. The initial mover position is identified by this change.

电压相位和电机直轴重合时，产生的电磁推力超过负载阻力，电机有一微动，由于反电势的作用电流就会降低，通过检测电流矢量的变化来估计动子的初始位置。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了