A Study of Influence of Configurations of the Windings on the Performance of Single Phase Induction Motor with Capacitor Start

The single phase induction motors needs two stator windings to produce rotating magnetic field : one main winding and the other auxiliary winding. The aim of the auxiliary winding is to create the rotating electromagnetic field when the machine is started-up and is afterwards turned off, generally through the centrifugal switch coupled together with the shaft of the machine rotor. The main purpose of this document is to evaluate the influence that the two windings have on the external characteristics of the single phase induction motor . For this purpose , two different kinds of windings were carried out and simulated, with the proposal to obtain some benefits. The main winding and the auxiliary winding were prepared and mounted on a prototype. The simulation was done via software based FEM , to make the extraction and results analysis possible. This results are shown at the end this document.     

A Fast Flux Search Controller for DTC-Based Induction Motor Drives

In this paper, a flux search controller is proposed to increase the efficiency of a direct torque-controlled induction motor in full load range. The value of the flux reference is determined through a minimization algorithm. The amplitude of stator current is used as the objective function since it is shown that samples of the stator current have better statistical properties than input power. In addition, the stator current has more sensitivity to the flux variation than input power. These two properties allow implementing an adaptive algorithm to determine the proper flux step without waste of time. The minimum allowable value of the flux step has been determined based on this process to prevent the divergence problem. This adaptive algorithm set a large flux step for transient state to speed up the convergence process and a small flux step for steady state to minimize the flux ripple. Simulation and experimental results presented in this paper confirm the fast dynamic of the proposed method.     

单偏置电压多位分布式MEMS传输线移相器

针对传统多位分布式MEMS传输线(DMTL)移相器需要多个偏置电压控制的问题,提出了一种单电压控制多位DMTL移相器的设计方案。这种移相器的每一位具有不同的弹性系数,因此它们的下拉电压各不相同。给出了这种移相器的相关理论、设计实例及仿真结果。通过仿真结果可知,单偏置电压3位DMTL移相器低位到高位的下拉电压分别为19.73,40.49和74.89 V,低位发生下拉时高位相移偏移小于0.062%(10 GHz,2.925×10-4 rad)。单偏置电压4位DMTL移相器低位到高位的下拉电压分别为19.73,32.55,48.41和74.89 V,低位发生下拉时高位相移偏移小于0.094%(10 GHz,4.425×10-4 rad)。     

Adaptive Approach to Motion Controller of Linear Induction Motor with Friction Compensation

In this paper, we propose a nonlinear adaptive controller and an adaptive backstepping controller for linear induction motors to achieve position tracking. A nonlinear transformation is proposed to facilitate controller design. In addition, the very unique end effect of the linear induction motor is also considered and is well taken care of in our controller design. We also consider the effect of friction dynamics and employ observer-based compensation to cope with the friction force. A stability analysis based on Lyapunov theory is also performed to guarantee that the controller design here can stabilize the system. Also, the computer simulations and experiments are conducted to demonstrate the performance of our various controller design.     

Load-Commutated SCR Current-Source-Inverter-Fed Induction Motor Drive With Sinusoidal Motor Voltage and Current

Current source inverter (CSI) is an attractive solution in high-power drives. The conventional gate turn-off thyristor (GTO) based CSI-fed induction motor drives suffer from drawbacks such as low-frequency torque pulsation, harmonic heating, and unstable operation at low-speed ranges. These drawbacks can be overcome by connecting a current-controlled voltage source inverter (VSI) across the motor terminal replacing the bulky ac capacitors. The VSI provides the harmonic currents, which results in sinusoidal motor voltage and current even with the CSI switching at fundamental frequency. This paper proposes a CSI-fed induction motor drive scheme where GTOs are replaced by thyristors in the CSI without any external circuit to assist the turning off of the thyristors. Here, the current-controlled VSI, connected in shunt, is designed to supply the volt ampere reactive requirement of the induction motor, and the CSI is made to operate in leading power factor mode such that the thyristors in the CSI are autosequentially turned off. The resulting drive will be able to feed medium-voltage, high-power induction motors directly. A sensorless vector-controlled CSI drive based on the proposed configuration is developed. The experimental results from a 5 hp prototype are presented. Experimental results show that the proposed drive has stable operation throughout the operating range of speeds.     

一种提高ESD性能的高压SBD器件结构研究

提出了一种新型SBD器件结构,并应用于高压SBD产品的研制。该结构通过在肖特基势垒区的硅表面增加一层表面缓冲掺杂层(Improved Surface Buffer Dope),将高压SBD的击穿点从常规结构的PN结保护环区域转移到平坦的肖特基势垒区,从根本上提高了器件的反向静电放电(ESD)和浪涌冲击能力。经流片验证,采用该结构的10A150VSBD产品和10A200VSBD产品均通过了反向静电放电(HBM模式)8kV的考核,达到目前业界领先水平。该结构工艺实现简单,可以应用于100V以上SBD的批量生产。     

三相异步电动机智能节能控制器的研究

异步电机在工农业生产中应用非常广泛。在电机起动时，会产生较大的电流，对系统本身以及电网都会产生较大的影响，并造成了电能的浪费。当电机的负载低于额定负载的75%时，效率较低，造成了能源浪费。经过理论分析，设计了一种电机智能节能控制器，用于电机的节能、软起动和运行保护。     

基于单片机的电机软起动控制器的设计

软起动器是电机软起动控制的核心,电机软起动时,通过软起动控制器控制功率变换单元,进而改变电机与可变电抗器之间的阻抗比例关系,实现调压,从而达到软起动的卧的。文中采用单片机设计电机软起动控制器,实现了智能控制,取得了较好的起动效果。经过试验表明,采用该软起动控制器时可以有效地减小电动机的起动电流,从而达到保护电机和设备的目的,表明该软起动器在电机起动过程中具有良好的起动效果。     

A Stochastic-Based FPGA Controller for an Induction Motor Drive With Integrated Neural Network Algorithms

This paper applies stochastic theory to the design and implementation of field-oriented control of an induction motor drive using a single field-programmable gate array (FPGA) device and integrated neural network (NN) algorithms. Normally, NNs are characterized as heavily parallel calculation algorithms that employ enormous computational resources and are less useful for economical digital hardware implementations. A stochastic NN structure is proposed in this paper for an FPGA implementation of a feedforward NN to estimate the feedback signals in an induction motor drive. The stochastic arithmetic simplifies the computational elements of the NN and significantly reduces the number of logic gates required for the proposed NN estimator. A new stochastic proportional-integral speed controller is also developed with antiwindup functionality. Compared with conventional digital controls for motor drives, the proposed stochastic-based algorithm enhances the arithmetic operations of the FPGA, saves digital resources, and permits the NN algorithms and classical control algorithms to be easily interfaced and implemented on a single low-complexity, inexpensive FPGA. The algorithm has been realized using a single FPGA XC3S400 from Xilinx, Inc. A hardware-in-the-loop (HIL) test platform using a Real Time Digital Simulator is built in the laboratory. The HIL experimental results are provided to verify the proposed FPGA controller.     

新颖力矩调节器

介绍了三相交流力矩调节器的应用，根据三相交流电彼此相应的相差１２０°的原理，提出了一种新的三相移相触发设计方案，叙述了它的工作原理及接线方式，通过试制和现场考验表明；该方案是可行的，线路简化，对称，一致，可获得高可靠性，高性价比的产品。     

新型具有宽调速比的无转速传感器的VVVF异步电机变频调速器

本文提出了一种新型具有宽调速比的无转速传感器的VVVF异步电机变频调速器，为此，在文中示出了一些重要的仿真结果，并对其进行了评述。     

Sensorless Induction Motor: High-Order Sliding-Mode Controller and Adaptive Interconnected Observer

An adaptive interconnected observer and high-order sliding-mode control of induction motors without mechanical sensors (speed sensor and load torque sensor) are proposed and experimentally evaluated. The adaptive interconnected observer estimates fluxes, angular velocity, load torque, and stator resistance. Stability based on Lyapunov theory is proved to guarantee the “observer–controller” stability.      

低压电机单机再起动控制器的设计与实现

分散式低压电机单机再起动控制有着广泛的应用需求.他不仅要求具有相当的可靠性、安全性、可维护性、可用性,还应具有良好的经济性.文中介绍了一种简单易用的低压电机单机再起动控制器的设计思想,着重说明了相关硬件模块的选择、再起动响应的实施步骤、与省电和电源控制相关的硬软件方法和基本功能实现.该系统投资少、体积小、应用方便灵活、功能简单可靠,已通过相关技术检测,成功应用到生产实践中.     

LNK306在高压永磁直流无刷电机控制器中的应用

主要介绍了一款新型非隔离高耐压开关电源芯片LNK306,详细说明了其工作原理。并在某型高压永磁直流无刷电机控制器开发中,以LNK306为核心,设计了一款宽输入电压范围的12V直流稳压电源,依据实际使用结果得出了积极结论。LNK306配合几个小型廉价的外围器件,便可构成一套稳定可靠的小型开关电源,是目前线性及电容降压式非隔离电源的优秀替代方案。     

SVPWM电压源逆变器供电异步电动机的动态仿真

建立了三相异步电动机在d-q坐标系下的动态数学模型,并介绍了控制异步电动机运行的两种控制技术:正弦波脉宽调制(SPWM)技术和空间电压矢量脉宽调制(SVPWM)技术。在Matlab/Simulink环境下,分别建立SPWM和SVPWM电压源型逆变器供电的三相异步电动机的动态仿真模型,比较分析了在这两种控制方式下的仿真结果。结果表明,较之SPWM控制方式,SVPWM的异步电动机变频调速系统启动快,转矩脉动小,定子电流谐波小,具有较好的动态性能和稳态性能。     

Improved PWM Control Strategy for Inverters and Induction Motor Drives

This paper develops a novel pulse-width modulation (PWM) strategy for application in uninterruptible power supply (UPS) and ac motor drive systems. The voltage/current harmonic spectra and other properties of this PWM scheme are thoroughly investigated. This modulation strategy is compared with other modulation techniques, especially with the commonly used sinusoidal modulation scheme, from the standpoints of simplicity, inverter switching losses, motor losses, and other output performance features. This novel modulation scheme produces an acceptable motor curent waveform while keeping the number of inverter commutations low. Implementation of this scheme is quite simple in hardware-based as well as microprocessor-based systems.     

On Sensorless Induction Motor Drives: Sliding-Mode Observer and Output Feedback Controller

In this paper, a sensorless output feedback controller is designed in order to drive the induction motor (IM) without the use of flux and speed sensors. First, a new sliding-mode observer that uses only the measured stator currents is synthesized to estimate the speed, flux, and load torque. Second, a current-based field-oriented sliding-mode control is developed so as to steer the estimated speed and flux magnitude to the desired references. A stability analysis based on the Lyapunov theory is also presented in order to guarantee the closed-loop stability of the proposed observer-control system. Two experimental results for a 1.5-kW IM are presented and analyzed by taking into account the unobservability phenomena of the sensorless IM.      

Design of Single-Chip Microprocessor-Based Controller for Current Source Inverter-Fed Induction Motor Drive

The single-chip microcomputer MC68701-based inverter gating system is proposed in this paper. The three-phase converter and inverter gatings occur independently and the current source inverter-fed induction motor controller with voltage feedback is also implemented in a single microprocessor. The accuracy of gating is about 1 deg in converter delay angle at line frequency 60 Hz and 0.19 percent in inverter frequency at output frequency 60 Hz. The proposed system is applied to 100-hp induction motor drive.     

自适应比例因子模糊控制器在异步电动机调速系统中的应用

为了降低转子电阻变化对异步电动机矢量控制系统性能的影响，本文把自适应比例因子模糊控制器应用到了矢量控制系统中。介绍了自适应比例因子模糊控制方法的綦本原理，给出了使用自适应比例因子模糊控制器的异步电动机矢量控制系统的结构框图，对主模糊控制器和辅助模糊控制器进行了设计。仿真实验结果表明，采用这种控制方法的调速系统不仅具有优良的动态性能，而且对转子电阻变化具有很强的鲁棒性。     

一种新颖电压取样型电机保护器

本文描述了一种新颖电压取样型电机保护器的保护特性、以及过压、欠压、断相(或错相)等特性.