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The stator temperature of the three phase induction motor with Z-source inverter drive is experimentally studied in this paper along with the comparison of the stator temperature of three phase induction motor with PWM drive. Z-source inverter employs an unique impedance network coupled with inverter circuit and rectifier. The inverter system using IGBT's, provide ride-through capability during voltage...
Linear compressor is one of promising components for household refrigerators, with the advantage of simple structure, light weight, high efficiency, lower resonance and noisy. In this paper, the researching status and developing trend of linear compressor are presented. The structure, the operation principle and the characteristics of the moving-coil, moving-magnet, and moving-iron type linear compressor...
Determination of mutual inductance in the WPT system based on the electromagnetic coupling mode is crucial for system design and efficiency optimization. The analytic formulas and experimental methods which only aim at a coupling coil with a certain type of configuration and parameters are not universal approaches. Therefore they can't serve as a design basis for the system optimization. This paper...
The simulation and optimization of a direct drive rotary motor (DDRM) for optimized torque output has been designed in this paper, which presents higher efficiency and better torque-to-volume ratio. Lacking of enough torque and precision, the traditional angular displacement control system is typically composed of a rotary motor and a moving platform from a series of complex mechanical transformations...
In rotor-bearing system of large submersible motor, many factors contribute to the generation of harmonics. This paper theoretically analyzes some factors and makes certain hypothesis. Rotor dynamics calculation model of large horizontal submersible motors is built. The phenomenon of harmonic resonance around the sub-critical speed is verified using finite element method, and the stress and displacement...
Three-level neutral-point-clamped (NPC) inverters have been widely applied in power conversion device occasions of medium high voltage and power, and, most recently, increasing in occasions of the low-voltage low-power applications. The three-level inverters have the problems of low frequency ripple that appears in the neutral-point (NP) of the DC-link under some operating conditions because of its...
Ultra-capacitors are known to absorb and deliver large amount of energy for a short period of time. This property has made them ideal components to be used in conjunction with batteries. Hence a hybrid energy storage system comprising of ultra-capacitor and battery offer many advantages. There are many ways in which the hybrid energy storage system can be configured in electric vehicles. In this paper...
To achieve the coordination control of voltage and current compensation with excellent system robust, a unified power quality conditioner (UPQC) controller design procedures based on sliding mode variable structure control (SMVSC) is proposed. First, making use of high self-adaptability and strong robustness of SMVSC, linearization and decoupling control of dynamic model for UPQC could be achieved...
In this paper, a multi-modular linear switched reluctance actuator (LSRA) is proposed in the active suspension application for its robust structure and fast dynamic response. In order to meet the requirements by active suspension system, a design optimization method, which aims to improve the average force, reduce the force ripple and increase the force density, is described in details. Based on the...
A controller for the linear compressors propelled by the linear switched reluctance actuators is developed and presented in this paper. The controller is based on DSP TMS320F28335. It consists of the DSP circuit, the protection circuit, the multi-output DC supply, the current sensing circuit, the driving circuit, the AC-DC rectifier circuit, and the actuator converter. The double-loop control scheme...
A novel Buck-Boost convertor based on tapped-inductor is presented in this paper. It can be provide wider voltage conversion ratio than conventional Buck-Boost convertor. When it running as boost-mode, recommended winding ratio setting (KD=1, KT<1) helps to achieve larger conversion ratio; when it running as buck-mode, the smaller voltage conversion ratio can be realized by opposed winding ratio...
DC distribution main consist of power electronics components and converter. Energy storage system is also required to maintain the voltage stable for DC bus. This paper discusses the structure of a hybrid energy storage system (HESS) of battery and ultracapacitor. A new bidirectional DC-DC buck/boost converter used for energy transfer between DC bus and HESS is also analyzed in detail. It not only...
For the industry development of electric vehicles, apart from concerns on the development of electric vehicles, we also need to consider the issue of the construction of charging facilities. Firstly, this paper describes the importance of AC charging piles for electric vehicle development. And then, the structure and the problems of the current AC charging pile are discussed. After that, a new charging...
This paper develops a multi-area generation reliability assessment. It can be used on different platforms. It is on the basis of QT and Cumulant method. QT has a goof cross-platform feature. The system developed by it can be conveniently used on different platforms. Stochastic production simulation is an important part of the power system operation and planning. The traditional algorithm of stochastic...
Nowadays, the photovoltaic system is widely used, but the charging and discharging controllers only provide protection to avoid overcharge and overdischarge. The poor charging ability leads the battery to have poor lifetime. The battery charging and discharging system in this paper can realize the three-stage charging, achieve the rapid charging of the battery, and make full use of the battery capacity...
To meet the high power and high stability requirements of BWT 915-10W and 915-30W pumped semiconductor laser (with adjustable current from 0 to 12A, current ripple factor less than 2%) a dual control and dual output circuit is designed to allow the power supply output current adjustable from 0 to 12A. It is called dual control because power can control manually by an external knob to achieve current...
The computation of stresses caused by electromagnetic forces on the end windings of large water filling submersible motor has a significant role in both the design and the performance assessment. This paper aims to analyze the stress distribution on the stator end windings during steady state operation by a three-dimensional finite element method (3-D FEM). A 3-D model was set up and some complex...
In this paper, a novel method to regulate the angle displacement of solar panel for photovoltaic (PV) power generation based on the three phase curved switched reluctance motor (SRM) is proposed. The mechanical structure of the tracking system and mathematic models of curved SRM are designed and elaborated. The electromagnetic features are analyzed by using finite element method (FEM). Both open loop...
By means of simulation-based study a loss analysis is performed on the five-level inverters for grid tie photovoltaic application. The essential objective of this analysis is the quantification of the possible improvement on the efficiency of the inverter by reducing the switching frequency applied in the conventional two-level inverter. Besides the benefit of five-level providing a higher power quality...
This seminar addresses the recent progress of wireless power transfer for short- and mid-range applications. The principles pioneered by Nicolas Tesla were first addressed. The maximum power transfer principle and the maximum energy efficiency principle are explained and compared. Some misunderstandings of magnetic resonance are clarified. With the memberships of the Wireless Power Consortium reaching...
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