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This paper presents a comprehensive analysis on torque ripples of brushless dc motor drives in conduction region and commutation region. A novel method for reducing the torque ripple in brushless dc motors with a single current sensor has been proposed by adding BUCK converter in the front of 3-phase inverter. In such drives, torque ripple suppression technique is theoretically effective in commutation...
Using adjustable speed scheme in high power motor drive can not only save energy greatly but also improve the dynamic performance of the motor. Recently, medium-voltage inverter becomes the most popular scheme for high-power motor drive, but in some especial fields multi-phase motor drives have more advantages. In this paper a vector control method of six-phase synchronous motor (SM) based on three-level...
In this paper, a robust switched reluctance motor (SRM) drive using the speed closed-loop with the discrete time reaching law control and the current closed-loop with nonlinear conversion function from torque to average current is proposed. Firstly, the current closed-loop is implemented by employing the average value of three phase-currents and the digital proportion and integrator, which greatly...
The paper presented the double switched reluctance motors parallel drive system for the electrical traction in shearer. The system components, such as the switched reluctance motor, the main circuit of the power converter and the controller, were described. The control strategies of the closed-loop rotor speed control with PI algorithm and balancing the distribution of the loads with fuzzy logic algorithm...
In this paper, a structure of a radial magnetic bearing with resonance circuit is proposed, which dose not need separate displacement sensors. The operating principle of the radial magnetic bearing is also introduced. The stability of the radial magnetic bearing is analyzed by the control system theory. The analysis shows that the proposed radial magnetic bearing with resonance circuit is unstable...
In this paper, a novel type auxiliary active edge resonant snubber assisted zero current soft switching pulse modulation series load resonant inverter using IGBT power modules is proposed for cost effective consumer high-frequency induction heating (IH) appliances. Its operating principle in steady state is described by using each switching mode equivalent operating circuits. The new multi resonant...
This paper presents a new ZVT-PWM high frequency inverter. The ZVT operation is achieved in the hole load range by using a simple auxiliary reverse blocking switch in parallel with series resonant capacitor dual duty cycle is used to provide a wide range of output power regulation which is important in many high frequency inverter applications. It is more suitable for induction heating applications...
In inverters, distortions of output sine voltages caused by factors like dead-times of power switches can be well compensated by instantaneous voltages and/or currents feedback regulators such as PID or repetitive controllers. However, in our experiments, we found that the dead-time differences between inverters would result in significant harmonic circulating currents, and instantaneous regulators...
To eliminate the deficiencies in the conventional drive control system of direct current (DC) motor for electric vehicle, we design a new permanent magnetic direct current (PMDC) motor with the enhanced exciting windings, namely, enhanced magnetism motor and develop its drive control system for electric transit bus. It can obtain enhanced torque with enhancing magnetism in low speed and enhanced speed...
Large power AC converters with synchronous motor load are widely used in field projects. In this article, hardware modules with VME-bus and graphical developing environment are used to construct a digital control system. This system is used to control a 5 MVA 3-level PWM AC-DC-AC IGCT converter with synchronous motor load. The open-loop control experiment result proves that using such a set of platform...
A certain method for the direct coupling of electrical circuits and two-dimensional finite element calculations is used for the transient analysis of a complete drive system in the time-domain. Thereby, a novel and deeper insight into the invoked harmonic spectrum of the electrical stator current and the mechanical torque at the rotating shaft could be achieved
Thanks to its unique properties, such as isotropic magnetic and thermal properties and low eddy current loss, the soft magnetic composite (SMC) material is suitable for application in electrical machines, especially those with complex structures and three-dimensional (3D) magnetic fluxes. This paper presents the performance analysis of a three-stack permanent magnet (PM) claw pole motor with an SMC...
This paper introduces the structure and operation principle of claw pole motor with permanent magnet outer rotor. The three dimensional magnetic field distribution at no-load condition has been analyzed by using the scalar magnetic potential. Moreover, the operation characteristic curves have been obtained at different speeds. The results of the paper are helpful to the computation of performance...
DC-DC converters are the kernel parts in the switching power supplies. There are abundant dynamical behaviors in them. In order to discover all these linear and nonlinear phenomena, it is demanded to put forward some appropriate modeling methods. This article discusses the modeling methods, which aimed at some familiar DC-DC converters under the control of voltage and current mode. They include exact...
The main purpose of this paper is to make a brief introduction of the applicable scope and the testing condition of IGBT module, to analyze the various reason causing IGBT module to be invalid which mainly involves drive part trouble, excessive heat, mechanical hurts, over voltage, over current and inductance that exists in the leads of circuit, and to make a general summary of the cautions which...
A novel IGCT-based half-controlled bridge-type fault current limiter is proposed in this paper. By substituting the half-controllable SCR in the rectifier bridge with self-turn-off device IGCT, the uncontrolled lime of the converter bridge can be reduced from half a cycle to the delay time of the current measuring circuit. If the maximum current in the dc reactor is preset, the inductance, volume,...
Multilevel inverters require a large number of power semiconductors. The gate driver for each power semiconductor requires its own floating or isolated DC voltage source. Traditional methods on meeting the requirement are expensive and bulky. This paper presents a gate driver design for floating voltage source type multilevel inverters. Bootstrap capacitors are used to form the floating voltage sources...
An up to 5 Watts wide range power supply LED driver demonstrator with a piezoelectric transformer (PT) has been built to show the static and dynamic behavior as an off-line power supply. The target of the power converter controller using a PT, with 2.3 mm thickness and 17 mm diameter at frequency of 155-175 kHz, designed in a resonant circuit of class-E topology, is to maintain a constant output current...
This paper presents the development of two three-level cascaded Z-source inverters, whose output voltage can be stepped down or up unlike a traditional buck three-level inverter. The proposed inverters are designed using two three-phase voltage-source inverter bridges, supplied by two uniquely designed Z-source impedance networks and cascaded at either their DC sides to form a DC-link-cascaded Z-source...
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