The brushless doubly-fed machine (BDFM), with simple structure and favorable reliability, has gained renewed attention in adjustable-speed drive and variable-speed constant-frequency generator applications in recent years for its features adjustable power factor and high efficiency. In BDFM, since both power winding and control winding are mounted in stator, current is doubly fed into the mach...

With the demand of power saving and the requirement for higher illumination quality, semiconductor lighting sources have been attractive for its excellent characteristics: high efficiency, low power consumption, long source life, color richness and environment friendness etc. As the representative of semiconductor illumination, the performance of high power Light Emitting Diodes (LED) improve...

Aiming at there shortcomings of the two speed regulating methods, switch-in-resisters-regulation and DC pulse-width-ragulation using SCR, which are currently used in mine-used electric locomotives powered by accumulators, a speed regulating method adopting a new type intelligent power module (IPM) as a chopper is designed in this research. Not only this method overcame the disadvantage of disc...

Power supply of lighting is a typical of power electronics system, which includes almost all basic technology and fundamental knowledge such as the topology of circuit, the strategy and technique of control and so on. The purpose of researching the power supply of lighting is to minish the size, reduce the cost and EMI, improve power density, realize modularization and standardization, improv...

The water pumping system uses Photovoltaic (PV) panels which produce electricity directly from sunlight using silicon cells and drive the pump through series of new technologies of electronics, motors, control units and different modern devices to bring water up from river, lake or deep well. Photovoltaic, mechanical and electronic theories etc. multi-across subject are involved in the system....

With the continuous increasing of people\\\’s life level and quality, the consumption of resources and energies grow up everyday. The shortage of them attracts more attention of the whole world, and many countries formulate relevant policies to cut down on resources. Nowadays, lamps\\\’ network controlling systems mainly use field bus. Such wire communication brings high metal con...

Simulating random movement of sea wave in the wave basin and making research into the action of sea wave on coastal and offshore structures could provide the reliable basis for engineering design and scientific experimentation.The multi-directional wave maker is the key problem for the realization of the physical model test.This paper introduces the actuality and development trend of technolo...

This paper select SIMOREG K 6RA24 fully digital variable?speed DC drive device as object and studied the fully digital variable ?speed DC drive . The control principle of this device and the main circuitry is analyzed. And based on the analysis of the performance this paper designed and realized to drive high ?power Load with 6RA2418. The results of this paper prove that the performance of the...

Stricted by manufacture technology of the pulse power, frequency of the pulse power used in the study of pulse electroplating was under 1kHz, studies on high frequency pulse electroplating of Ni-Co that the frequency ranging from 20 kHz to 140kHz cannot be found. In this text, mechanical performance of Ni-Co alloys prepared by high frequency, ranging from 20kHz to 140kHz, pulse electroplating...

The thesis is chiefly contributed to the deep study of AC drive intellectual control based on neural networks. The AC motor drive has been one of the important areas in automation research. The performance of the AC motor drive has been highly improved recently. The thesis dissertates on the principles of vector control and field orientation detailedly at first. The vector control can improve ...