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The following topics are dealt with : PM machine; DC machine; power converter; inverter; motor drive; linear machine; renewable energy; induction machine; synchronous machine; next generation vehicle; transformer; and high voltage machine.
With fast economic development and explosive population growth, fossil energy has been consumed dramatically. Therefore, as a renewable and clean energy source, solar power has been paid much attention and driven by the international market and domestic policy. This paper first introduces the development of the technology and market of grid-connected PV system in China. Thereafter, the bottleneck...
The permanent magnet (PM) synchronous machine (PMSM) is widely used in hybrid and electrical automotive applications because of its high power density. Machines having fractional number of slots per number of poles machine and using concentrated windings have several advantages in comparison with the machines having distributed windings, mainly in terms of copper volume and simplicity of manufacturing...
This paper introduces activities of 4Hi-Motortronics of KERI such as energy saving high efficiency induction motor, 1 MW high temperature superconducting (HTS) motor, permanent magnet excited transverse flux motor (TFM), 200 kw 30,000 rpm high-speed motor, and nanometer scale precision magnetic lévitation stage. This paper also introduces other activities of KERI, which are not within the scope of...
This paper presents an overview of the operating principles, electromagnetic analysis and design, shape configurations and system level performance of the novel types of the advanced actuators and sensors for industrial applications developed during 2000-2010 at the EPE group of Eindhoven University of Technology, the Netherlands in closed co-operation with national/international academic and industrial...
From deterrence and the energy problem of global warming, application of the electric motor is progressing as a motor of a automobiles. Technical evolution of the electric motor for automobiles is remarkable by acceleration of EV, HEV, and FCV development. This paper introduces the latest example about technical evolution of the electric motor for them.
The Urban Maglev Program is a unique type of R&D project in the sense that it is a combination of R&D project and construction project. The prototype maglev vehicles of commercialization model were built and have been under various tests on the test track. The preliminary test results of the maglev vehicles show that the performances including powering and braking, ride quality, cabin noise...
Japan, France and Germany have developed high speed railway systems based on their own technologies. Since April 2004, Korea has been operating KTX(Korea Train eXpress). Following the successful national R&D project, Korea has recorded remarkable technological progress. However, in order to see further progress, Korea needs to continuously develop the EMU(Electric Multiple Unit) type Korean next...
This paper presents a new auto-tuning method for the wide input voltage range digital control buck-boost dc-dc converter. This buck-boost dc-dc converter is used with wide input voltage and a suitable proportional gain and bias value are changing against the input voltage of the converter. The gain and bias value are changed suitably in real time with digital control. As simulation results, it is...
The paper proposes a medium voltage Z-source ac-dc-ac converter for mining application. It could provide buck-boost function and make the role of frequency changer. Compared to the traditional ac-dc-ac converter, it has higher efficiency and better circuit characteristics. The circuit topology, operating principle, simulation results will be given in this paper, and the rationality and feasibility...
To obtain a large number of output voltage levels with minimum devices, it presents a cascaded H-bridge multilevel inverter employing trinary dc sources. The proposed inverter can synthesize high quality output voltage near to sinusoidal waves. The circuit configuration is simple and easy to control. The operational principle and key waveforms are illustrated and analyzed. To verify the performance...
In this paper, a new algorithm is proposed to determine the magnitudes of dc voltage sources used in asymmetric cascaded multilevel converters. Using this algorithm, it is possible to generate the maximum number of output voltage levels and maximum output voltage amplitude using the minimum number of dc voltage sources. The magnitudes of dc voltage sources are determined in a way considering which...
Fixed speed wind turbine generators system that uses induction generator as a wind generator has the stability problem similar to a synchronous generator. On the other hand, doubly fed induction generator (DFIG) has the flexibility to control its real and reactive powers independently while being operated in variable speed mode. This paper focuses on a scheme where IG is stabilized by using DFIG during...
A novel solution for projector light source was proposed. With this solution, the light splitting sets was cancelled, the excessive light loss can be avoided. In the proposal method, three kinds of LEDs placed in front of the different incident face of the X prism were driven by different current with the purpose of obtaining the mixed white light for liquid crystal board (LCD). Three buck converters...
Multilevel voltage source inverters are emerging as a new breed of power converter options for high-power applications. Various topologies and modulation strategies of multilevel inverters have been proposed. In this paper, the different multi-carrier PWM techniques are investigated and several interesting characteristics of them are revealed. A new method of multi-carrier PWM strategies is also proposed...
In comparison with other types of synchronous generators, permanent magnet synchronous generator (PMSG) has the advantages of higher efficiency, simplicity in construction and reliability in operation. This paper presents a multi-stage 3-phase AC/DC PWM converter. The proposed converter is designed to extract the maximum power from the PMSG side and avoid speed sensing. Furthermore, the controller...
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