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Wang Q.,Harbin Electrical Machinery Company Ltd
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys

The characteristics of aluminum bronze material, using conditions and requirement for mechanical properties of porcelain sleeve flange were expounded. The porcelain sleeve flamge was produced by centrifugal casting. Through analyzing defects and implementing measures for eliminating defects, the proper centrifugal casting process was presented. By controlling strictly production process, the qualified porcelain sleeve flange was produced successfully. Source

Wang C.,Harbin Institute of Technology | Li X.,Harbin Electrical Machinery Company Ltd | Jiang B.,Harbin Institute of Technology
Applied Physics Letters

A model of plasma-antenna is carried out to study the radiation enhancement mechanism of antenna covered by thin plasma layer. The results show when the radiation intensity achieves maximum, a region of equal electric field is formed due to the reflection of electric field at the interface of plasma and air. The plasma layer acted as an extension of the antenna. Furthermore, the shape of plasma layer is changed to verify the effect of plasma boundary on antenna radiation. The study shows the effect of thin plasma layer on electromagnetic field and provides a type of plasma antenna. © 2015 AIP Publishing LLC. Source

Liang Y.-P.,Harbin University of Science and Technology | Chen J.-Q.,Harbin University of Science and Technology | Huang H.,Harbin Electrical Machinery Company Ltd
Dianji yu Kongzhi Xuebao/Electric Machines and Control

A 2-D transient finite element model of 1400MW nuclear half-speed turbogenerator was established in this paper. The rated operation condition of the generator was simulated using equivalent load impedance method which can avoid the iteration of the power factor. Aiming at the fact that the rotor of large-capacity nuclear half-speed turbogenerator was usually designed with bias slot to improve generator performance, the excitation current of the nuclear half-speed turbine-generator with different bias slot was calculated depending on the method's correctness. At the same time, the flux density change at critical points of high flux density region was quantitative calculated. The results showed that the bias slot structure of rotor will greatly influence the excitation current and reasonable bias angles will improve magnetic field distribution in high flux density region to avoid local overheating. The conclusion could provide theoretical basis for the rotor magnetic circuit structure design of large-capacity nuclear half-speed turbogenerator. Source

Jiao X.-X.,Harbin Electrical Machinery Company Ltd | Guan C.-W.,Harbin Institute of Technology | Li W.-L.,Harbin University of Science and Technology | Zheng P.,Harbin Institute of Technology
Dianji yu Kongzhi Xuebao/Electric Machines and Control

In order to research the influences of large turbine generator ventilating system on the stator cooling and stator temperature distribution, taking 200 MW turbine generator for example, the mathematical and physical model for 3D fluid and temperature coupling analysis of stator multipath ventilation system of half axial section was established. The fluid and temperature fields of motor with different cooling medium were coupled calculated using numerical method. The influence of hydrogen and air cooling capacity on temperature rise was quantitative analyzed. The influences of the changes of fluid properties on axial velocity distribution and inlet velocity of different ventilation ducts were analyzed. The heat transfer coefficients in fluid-structure contact surface were calculated. In addition to that, the temperature drop of stator insulation was analyzed, and the insulation temperature drop using hydrogen cooling is lower 13°C than that of using air cooling. It helps to reduce damages caused by stresses on insulation. Source

Qingyu W.,Harbin Electrical Machinery Company Ltd
Tezhong Zhuzao Ji Youse Hejin/Special Casting and Nonferrous Alloys

Characteristics of high lead bronze frictional ring and improvement of casting processing were described, including alkaline phenolic resin sand; metal mold casting and application of anti-tangent gating system. The practical production verified that the improved processing exhibits the features of simple programs, high precision and low cost as well as high efficiency. In addition, defects easily occurred in product and countermeasures were pointed out, which provided a reference for production. Source

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