Universal Induction Motor Model With Low-to-High Frequency-Response Characteristics

A three-phase induction motor model that depicts the motor behavior over a wide range of frequencies from 10 Hz to 10 MHz is presented in this paper. The model is universal in the sense that common-mode, differential-mode, and bearing circuit models are combined into one three-phase equivalent circuit model. The proposed model is basically an extension of the low-frequency IEEE Standard 112 circuit model. The proposed model was experimentally simulated and verified with results presented.     

Multimicroprocessor-based robust control of an AC induction servomotor

A multiloop feedback control system supplemented by a complementary controller is used to improve the drive performance of an AC induction servo motor and reduce sensitivity to parameter variations, nonlinear effects, and load disturbances. Based on the principle of field-oriented vector control, a software-based current-decoupled controller has been proposed. A simplified model of the current-decoupled induction motor has been used for the design and simulation of the proposed robust controller. Experimental results based on multimicroprocessor implementation are presented to illustrate improved response and reduced sensitivity     

Modeling and implementation of a microprocessor-based CSI-fedinduction motor drive using field-oriented control

A new approach to model the current-source-inverter-fed induction motor drive is presented. The mathematical model takes into account the rectifier, inverter, and induction motor dynamics and is established in the stationary reference frame. For controlling the drive speed, a modified indirect field-oriented control is proposed. To counter the effects of torque pulsations at very low speeds and rotor resistance variation, a slip compensation loop is included in the control law formulation. A microprocessor-based prototype system is also implemented, providing full digital control of the drive speed. Both computer simulation and experimental results are presented     

Dynamic analysis of induction motors with saturable inductances

The paper describes the development of a computer model to simulate an induction motor including the effects of saturation on leakage and magnetizing inductance. The machine dynamics are presented by a set of nonlinear time-varying differential equations. The machine saturable inductances are modeled by closed-form nonlinear functions. A 1100 W induction motor is tested and the machine parameters are estimated. The identified model is simulated using the fourth-order Runge-Kutta method for both saturable and unsaturable inductances. The model is validated by comparing a sample simulated result with the dynamic performance measured in the laboratory.     

Modeling and Adaptive Decoupling of High-Frequency Resistance and Temperature Effects in Carrier-Based Sensorless Control of PM Synchronous Machines

This paper analyzes the effects of the high-frequency resistances in saliency tracking-based sensorless control methods of permanent-magnet synchronous machines (PMSMs). A high-frequency model of the PMSM, including stator high-frequency resistance, is presented. From this model, potential sources of error in the estimated position due to the high-frequency resistances are analyzed, and their compensation by means of an adaptive decoupling mechanism is proposed. This paper also addresses the influence and compensation of temperature effects in carrier-signal-injection-based sensorless techniques.      

基于逆变器直流侧电流和融合算法的感应电机转子故障诊断方法

分析了逆变器驱动的感应电机发生转子故障时的逆变器直流侧电流的频谱成分,发现与转子故障对应的故障特征频率分量分布在逆变器直流侧电流频谱的低频和高频的多个频段.基于此,提出了一种融合算法,利用解析信号的模平方函数将分布在高频段的故障特征频率分量转化到低频段,然后和低频段的信号进行融合相关处理,融合谱中的噪声和与故障不相关的...     

笼型感应电动机转子断条和开裂的故障诊断和在线监测

分析了笼型感应电动机转子故障时导条断条和端环断裂的物理模型 ,给出了电动机的定转子绕组的参数计算表达式 ,建立了数学模型 ,从而导出转子故障时的电流和频谱分析。本文分析了电动机在故障时 ,在dqn任意速坐标系中 ,电动机定子电流的轨迹 ,为电动机的故障诊断和在线监测提出了一种新的方法 ,较以往的电流监测方法更有利于克服边频带的影响。     

一种用于异步电机控制的新型滑模速度观测器研究

提出了一种新颖的用于异步电机控制的滑模速度观测器。该观测器具有结构简单、新颖、易于实现的特点，在无速度传感器的电机控制系统中，能有效地消除运用滑模观测器所固有的高频速度抖动现象。该观测器利用电压和电流信号构成观测器估计电机转速、转子磁通量以及转子磁通的位置，其理论的正确性可由李雅普诺夫理论证明。将其应用于采用磁场定向矢量控制方法的无速度传感器的感应电机控制系统，实验证明，在整个调速范围内都取得了很好的效果，系统具有很好的稳态精度和动态响应性能。     

一种用于异步电机控制的新型滑模速度观测器研究

提出了一种新颖的用于异步电机控制的滑模速度观测器。该观测器具有结构简单、新颖、易于实现的特点,在无速度传感器的电机控制系统中,能有效地消除运用滑模观测器所固有的高频速度抖动现象。该观测器利用电压和电流信号构成观测器估计电机转速、转子磁通量以及转子磁通的位置,其理论的正确性可由李雅普诺夫理论证明。将其应用于采用磁场定向矢量控制方法的无速度传感器的感应电机控制系统,实验证明,在整个调速范围内都取得了很好的效果,系统具有很好的稳态精度和动态响应性能。     

电压稳定分析中异步电动机动态负荷建模探讨

探讨电压稳定分析中异步电动机(IM)负荷的建模问题。分析一般的动态负荷模型(GDLM)不能捕捉IM动态行为的机理。分别以IM的滑差模型和滑差磁链模型为基础，严格地导出了适用于电压稳定分析的简化一阶(SIM)和详细三阶(DIM)动态负荷模型，同时还说明了SIM和DIM模型实质上是对GDLM模型进行了不同程度的改进。对SIM和DIM模型在暂态电压稳定分析和静态电压稳定分析中的适用性进行分析比较，仿真结果表明：SIM和DIM分别以不同的准确度适用于不同场合的电压稳定分析。     

Experimental High-Frequency Parameter Identification of AC Electrical Motors

In order to predict conducted electromagnetic interference in inverter-motor drive systems, high-frequency (HF) motor models are requested and the involved parameters have to be available. In previous studies, the authors have presented an accurate HF model for induction motors and they have defined the procedures to identify the model parameters. In this paper, these results are extended to several types and sizes of industrial ac motors such as induction, synchronous reluctance (without interior permanent magnets), and brushless motors. The model parameter-identification procedure has been improved, and it is based on a least-squares data fitting applied to the measured magnitude and phase-frequency-response curves of the phase-to-ground and the phase-to-neutral impedances. The aim of this paper is to provide quick indications to select the suitable values of the HF model parameters, with reference to the size and type of the ac motor, to evaluate the HF voltage and current components in inverted-fed ac motor systems     

Slip-frequency detection for indirect field-oriented control drives

This paper presents a new technique to detect the slip angular frequency in induction motor drives with indirect field-oriented control (IFOC). Slip frequency is calculated by processing the effects exerted by an additional high-frequency signal on the zero-sequence stator voltage. By measuring such a zero-sequence voltage, it is possible to evaluate the air-gap flux and detect the slip frequency in order to implement an IFOC algorithm. According to the proposed approach, rotor time constant errors are not influent as in conventional field-oriented control schemes, thus, complex tuning or compensation techniques are not required. Simulations and experimental tests are performed to evaluate the consistency of the proposed approach.     

动态边端效应下直线感应电机最小损耗控制

针对当前直线电机应用中提升效率的需求和其效率优化策略中损耗模型准确性和复杂度难以取舍的问题, 对直线感应电机提出了一种考虑动态边端效应和漏感影响,同时复杂度适中的新型最小损耗策略。通过计算最优磁 链,重新平衡 ｄ－ｑ轴电流。文章首先基于改进的双三相直线感应电机数学模型推导出一种新型稳态损耗模型,并 由此模型设计出完整的最小损耗控制策略。对于 ３ｋＷ短初级六相直线感应电机,仿真验证此策略较传统策略,在 ０.２ｐ.ｕ.轻载、５ｍ／ｓ时减少约 ２５０Ｗ（４８％）损耗,同时推力波动显著减小。最后全面对比了各种工况下此处新策略 的损耗降低效果。     

基于电机热模型的电动机保护方法的研究

本文采用电动机热模型 ,研究了因过载、不对称运行、频繁起动等故障而引起的过热时 ,对电动机实行保护的可行性。在分析电动机热模型的基础上 ,推导出了电机温度的在线离散算法。采用这种算法可以实现电机故障运行时绕组内部温度的实时计算 ,从而实现电动机的智能化保护。文中给出了基于热模型的电动机综合保护器的结构。仿真结果表明 ,基于热模型的电动机综合保护是可行的     

三相异步电动机的SABER仿真模型

根据异步电动机的理论,得到两相静止坐标系下的异步电动机的数学模型,在此基础上利用SABER仿真软件建立了电流—电压和磁链—电压两种仿真模型。通过对模型的仿真,表明其性能与真实的异步电动机的性能一致。     

基于双曲正切函数的非线性PI控制器及其在感应电动机矢量控制中的应用

提出了一种基于双曲正切函数的非线性PI控制器,将它用于感应电动机矢量控制系统的速度控制.根据模态等效原理,证明了该非线性PI控制器与某种模糊逻辑控制器的近似等效性,但在实现方面却比模糊控制器简单得多,同时克服了模糊控制器固有的高频抖振缺点.仿真和实验结果均证明了该非线性PI速度控制器在感应电动机的矢量控制中具有较好的控制性能.     

Wavelength constants and interturn overvoltages in a multiturn random winding of an induction motor supplied from a PWM converter

A calculation procedure for wavelength constants and interturn overvoltages in a multiturn random winding of an induction motor supplied from a frequency converter is described. A mathematical model and modeling results for wave processes in sections (turns) of the multiturn random winding of the induction motor with a cage rotor are presented.     

负荷模型动态特性不确定性对低频振荡的影响

对电力负荷的动态特性对低频振荡的影响进行研究。采用由1个感应电动机与1个静态负荷并联而成的综合负荷模型，考虑在建模过程中存在负荷参数辨识误差及负荷特性估计的不准确造成的不确定性，研究动态负荷所占比例和电动机惯性时间常数对电力系统低频振荡频率和阻尼的影响。通过对一个4机2区域系统的典型实例进行研究分析，得出了一些有意义的结论。     

Field-oriented controllers with rotor deep bar compensationcircuits [induction machines]

A rotor deep bar effect compensation circuit for field-oriented controllers is derived from the transient equations of a double-cage induction machine. Torque and flux are decoupled with respect to the airgap flux. Accurate tuning of the field-oriented controller is possible both for steady-state and high-frequency conditions in the rotor. Consequently, an extended static stability region and improved torque dynamics are obtained with the deep bar effect compensated induction motor drive     

On the variation with flux and frequency of the core loss coefficients in electrical machines

A model of core losses, in which the hysteresis coefficients are variable with the frequency and induction (flux density) and the eddy-current and excess loss coefficients are variable only with the induction, is proposed. A procedure for identifying the model coefficients from multifrequency Epstein tests is described, and examples are provided for three typical grades of non-grain-oriented laminated steel suitable for electric motor manufacturing. Over a wide range of frequencies between 20-400 Hz and inductions from 0.05 to 2 T, the new model yielded much lower errors for the specific core losses than conventional models. The applicability of the model for electric machine analysis is also discussed, and examples from an interior permanent-magnet and an induction motor are included.