IEEE Transactions on Industrial Electronics

A switched reluctance motor (SRM) drive generally requires a rotor position sensor for commutation and current control. However, the use of this position sensor increases both cost and size of the motor drive and causes limitations for industrial applications. In this paper, a novel indirect position sensing technique, namely, the sliding-mode observer, is proposed for SRM drives. The correspondin... View full abstract»

This paper presents a model-based vision system to achieve robust recognition of planar contours that are scale invariant of known models. Planar contours are partitioned into segments by using constant curvature criterion. A set of descriptors that are invariant with respect to scale, rotation, and translation are extracted from the geometric features of the segments. The descriptors are used to ... View full abstract»

A simple resonant link inverter is proposed to achieve pulsewidth modulation operation by using a single set of auxiliary resonant circuits which provides the soft-switching function to all main switches. With the proposed circuit, the clamped output link voltage, soft switching of all switches and reduced current stress on the resonant switch can be obtained View full abstract»

The AC-to-AC converter called the matrix converter is very simple in structure and has powerful controllability. However, there are few practical applications, particularly in power electronics fields. The major reasons largely lie in the commutation problem and complexity of the control circuit. This paper proposes a novel commutation technique which is very simple to implement. This commutation ... View full abstract»

Improvements to the PSpice model for the MOS-controlled thyristor (MCT) (as discussed by Yuvarajan and Quek, 1995) are proposed. The improved MCT model is capable of simulating the breakover and breakdown characteristics of an MCT and working properly at high frequencies. The simulation results of various circuits show quite accurate behavior of the proposed model View full abstract»

The steady-state oscillation of a zero-voltage-switching clamped-voltage self-oscillating ballast driven by a saturable transformer is analyzed and simulated. Its self-oscillating operation is divided into six stages according to the hysteresis B-H loop of saturable transformer cores. Stage-wise circuit analysis shows the saturable transformer limits the lamp current and dominates the switching fr... View full abstract»

In this paper, the nonlinear sliding-mode torque and flux control combined with the adaptive backstepping approach for an induction motor drive is proposed. Based on the state-coordinates transformed model representing the torque and flux magnitude dynamics, the nonlinear sliding-mode control is designed to track a linear reference model. Furthermore, the adaptive backstepping control approach is ... View full abstract»

Synchronization of concurrent activities by means of semaphores is widely adopted in industrial distributed systems. This paper presents some mechanisms which facilitate the efficient implementation of the popular semaphore concept in real-time networks based on the controller area network medium access technique. The advantages obtained by adopting the proposed solution are twofold. First, better... View full abstract»

This paper compares the wavelet power spectrum smoothing method with the Welch method in the random vibration control algorithm of an electrodynamic shaker. Practical results show that the wavelet smoothing method improves the control algorithm performance significantly View full abstract»

The literature contains many papers on resonant switching power converters and their main drawbacks, such as the variable driving frequency. In this paper, we show another approach to the design of switched converters that takes its origin from the high-power converters based on thyristors. It is well known that thyristors are switched off at “zero current” by firing a current oscillat... View full abstract»

It is shown that the pulsewidth modulation inverter-fed power line is a feasible medium for the transmission of modulated digital information at data rates of over 40 kb/s and that this transmission path provides a suitable alternative to the sensor cabling between the actuator and the controller of an encoder-based servosystem. The encoder data is modulated and transmitted from the actuator to th... View full abstract»

When an induction motor is driven by a pulsewidth modulation (PWM) inverter, acoustic magnetic noise caused by harmonics of the induction motor input is a serious environmental problem. In this paper, a novel prediction method of acoustic magnetic noise is proposed. Acoustic magnetic noise emitted from an induction motor is considered as the function of harmonic components of induction motor curre... View full abstract»

In this paper, the authors introduce a signal detection scheme based on the bifurcation behavior of the driven Duffing oscillator. Chaotic systems are sensitive to certain signals and immune to noise at the same time, the properties of which demonstrate their potential application in weak signal detection. Starting from the analysis of the intermittent chaotic motion occurring in the detecting pro... View full abstract»

A high-performance torque controller is proposed for three-phase brushless DC motor drives. The strategy is based on variable-structure control and a new synchronous reference frame is utilized. Advantages over conventional strategies include improved dynamic performance, reduced acoustic noise, improved drive efficiency and enhanced inverter utilization View full abstract»

In this paper, the small-signal performance of different vector controllers for grid-connected voltage-source converters is investigated. Losses in the line filter, as well as nonlinearities due to blanking time and nonideal valves, are usually not modeled in the evaluation of the performance of control principles. A method to compensate for nonlinearities due to blanking time and nonideal valves ... View full abstract»

This paper introduces a Class DE current-source parallel resonant inverter, along with its design procedure and experimental results. This circuit offers several desirable features. First, the proposed circuit lacks harmonic components of input current over the voltage-source inverters. Second, the source pin of the MOSFET is directly connected to the ground, so that it is not necessary to use a c... View full abstract»

A single-stage power-factor-corrected pulsewidth modulation power converter with extended load power range is presented. The topology is based on a zero-voltage zero-current-switched full-bridge (ZVZCS-FB) inverter. Steady-state analysis of the topology shows that by operating the LC load filter in discontinuous mode, the DC-link voltage remains bounded and independent of the load level. Therefore... View full abstract»

This paper addresses the problem of electronic emulation of both linear and nonlinear mechanical loads using a vector-controlled induction machine dynamometer. It is shown that a basic emulation scheme where the dynamometer torque demand is derived from the inverse dynamics of the emulated load is not generally viable, especially if the emulated load is part of a closed-loop speed control system. ... View full abstract»

This paper describes and compares three different state-of-the-art condition monitoring techniques: first principles, feature extraction, and neural networks. The focus of the paper is on the application of the techniques, not on the underlying theory. Each technique is described briefly and is accompanied by a discussion on how it can be applied properly. The discussion is finished with an enumer... View full abstract»

This paper discusses the improvements acquired by the introduction of a tracking controller and a look-ahead trajectory-planning policy in part fabrication using the layer manufacturing process. The improvements are quantified not only in terms of tracking and contouring errors, but they are also quantified in terms of overfilled and underfilled areas, thus directly relating the quality of parts f... View full abstract»

Three-phase pulsewidth modulation (PWM) converters, specifically, voltage-source inverters (VSI), are possibly the most frequently used power converters for applications such as industrial motor control, robotics, air conditioning and ventilation, uninterruptible power supplies, electric vehicles, etc. With the introduction of standards on limiting harmonic pollution of electrical power distributi... View full abstract»

It is well established that magnetic components may be reduced in size by operating at high frequency. Miniaturization of magnetic components is ideally suited to microelectronics technologies such as thick films, which lend them to planar geometries. This paper describes new analytical models, which predict inductance- and frequency-dependent eddy-current losses in magnetic substrates. Prototype ... View full abstract»

This paper proposes a cost-effective architecture of fuzzy logic controller (FLC) that works in an accurate and fast manner. The accuracy of the proposed FLC is obtained by using the center of gravity (COG) defuzzifier that considers both membership values and spans of membership functions in calculating a crisp value. The cost effectiveness of the proposed FLC is obtained by restructuring the con... View full abstract»

This paper presents an improved method of current reference determination for a parallel active power filter. To insure sinusoidal line currents, thus reducing reactive power, an integrative method of reference calculation is applied. As a result, satisfactory response of line current to the load change is achieved. One of the major problems, the synchronization to the net voltage, is also conside... View full abstract»