The speed - independent position function of the rotor was given by analyzing the phase current and phase voltage of the permenent magnet brushless dc motor , using the powerful operation function of dsp 利用dsp的强大运算功能，通过分析永磁无刷直流电动机的相电压与相电流给出转子速度无关位置函数。
This paper gives the fundamental equation of electric circuit of switched reluctance generator ( srg ) . the phase flux linkage , indutance and phase current of srg are discussed based on unsaturated magnetic circuit 给出了开关磁阻无刷发电机的相电路基本方程，分析了基于不饱和磁路条件的相磁链、相电感和相电流。
The result of simulation for the closed - loop system in the matlab illustrates that the system can provide unity power factor not only in ideal condition but also in the case of errors in missing of some current 研究表明系统在理想情况下能实现单位功率因数而且在某相电流误差信号丢失的非理想情况下仍然能实现单位功率因数控制。
Based on quasi - linear model of sr motor , the influences of angle on phase current , output power , energy loss are analyzed . an optimum result of angle is produced in accordance to given target 基于sr电机的准线性模型，本文分析了开通角和关断角与相电流、输出功率以及损耗之间的关系，并根据给定的优化目标，给出了该电机开通角和关断角的优化结果。
Thirdly , current ripple will be calculated in two current control mode respectively and paper will make a conclusion about its interaction with the voltage , current , frequence and so on . finally this paper will show the design of the controller and test waveforms 另外，本文分析了在两种电流控制方式下，即pwm控制和滞环控制下电流脉动和相绕组电压、相电流、转速和开关频率的关系。
Secondly , combined with the comparatively ripe ac motor mathematic model , the energy characteristic model of motor among the drive - line of pev is built , then the changes of motor stator current and voltage under different working condition can be calculated 然后引用较成熟的三相异步交流电机的数学模型建立了纯电动汽车传动系中电机的能量特性模型。利用该模型可计算出动态条件下电机定子相电流、相电压的变化。
And it analyses the power factor in different conditions via the fourier anlysis of the stator current and voltage . then , it sets up the simulating model for maximum torque / current ratio . the torque can be controlled by controlling the angle of stator current vector 在矢量控制实现的基础上,采用傅立叶分解分析电机的相电流和相电压,得到矢量控制系统中电压和电流的基波分量和相位角,进而判断电机的功率因数,分析在不同控制情况下电机的功率因数状况。
The system is based on chopper constant current drive technique , according to the top level design idea , adopting advanced specical subdivision control integrate circuit and powerful function 80c196kc to organize the system frame , desiging the minimum system of single - chip microcomputer , multifunction i / o interface circuit , relay switch circuit , keyboard and display circuit , multifunction digital setting interface circuit and so on , utilizing the hso and hsi interface circuit which are owned by this single - chip microcomputer exclusively and its powerful command system to realize dual - degree switch control , automation orientation , automatically searching zero position , locking machine when stopping , frequency to set digitally , automatically adjusting speed through changing frequency , swithing subdivision or squarewave control , on the basis of above , the system also have the function of running according to the setting steps and the frequency , voltage and current to display through the led , etc 系统基于斩波恒流驱动技术，按照顶层设计思想，采用先进的专用细分控制电路和功能强大的80c196kc单片机来组建系统构架，设计了单片机最小系统、多功能i o接口电路、继电器切换电路、键盘显示电路和多功能数字设定接口电路等，利用该单片机独有的hso和hsi接口及其强大的指令系统，实现了双余度混合式步进电动机的余度切换控制、自动定位、零位自动搜索、停机锁定、数字化频率设定、自动调频变速控制、细分方波切换控制，在此基础上，该系统还设有按预置步运行、 led频率电压相电流显示等功能。
In the design of real - time control system , the paper takes three - phase full - bridge mosfet inverter as the real - time control main circuit , and adopts a control scheme with 120 ? switching mode combined with half - bridge pulse width modulation ( pwm ) , which would avoid straightthrough short of a certain bridge . phase current is detected by single current sensor ; three - phase position signals generated by position sensors could not only supply commutation information for inverter , but also be used for speed detecting based on signals " period measurement , which makes the speed sensor unnecessary . the whole control system adopts speed and current dual closed - loop control strategy in order to construct a high performance rare - earth permanent magnetic brushless dc motor ( repm bldcm ) full - digital real - time control system 在实时控制系统的设计中，本文以三相全桥mosfet逆变电路作为实时控制主电路，采用120导通方式结合半桥pwm调制的控制方案，从而有效地避免了桥臂的直通短路；本文用单电流传感器实现对相电流的检测，来自位置传感器的三相位置信号不仅为逆变电路提供换相信息，而且也用于基于信号周期测量的转速检测，这样就省去了速度传感器；系统采用的是速度、电流双闭环控制策略，力求构建高性能的稀土永磁无刷直流电动机全数字实时控制系统。
Compared with the conventional electromagnetic motor , the ultrasonic motor has the following features : high speed , high holding torque when power is off and so on . because of it ' s characteristics , the ultrasonic motor has obtained some widespread application in robots , precise instrument , house electronical appliance , sapceecraft automobile and micromechanism 主要有以下几个部分： 1建立了两相混和式电动机的稳态数学模型，分析了超前角对相电流及机械特性的影响，并同时进行了仿真研究，给出了一些有意义的结论。
