Inter-turn short circuit of field windings (ISCFW) may cause the field current of a generator to increase, output reactive power to decrease, and unit vibration to intensify, seriously affecting its safe and stable operation. Full integration of mechanical and electrical characteristics can improve the sensitivity of online monitoring, and detect the early embryonic period fault of small turns....

In the design of RF power amplifiers, wide-band transformers play an important role in the quality of the amplifier as they are fundamental in determining the input and output impedances, gain flatness, linearity, power efficiency and other performance characteristics. The three forms of transformers that are encountered, unbalanced-to-unbalanced (unun), balanced-to-balanced (balbal), and balan...

In active magnetic bearing control systems, the performance of closed-loop and application can be impaired by external disturbances. This article analyzes unbalanced pull forces produced eccentricity a high-speed 1MW 3-phase solid rotor induction motor. The effect on five-degree-of-freedom resulting vibrations are studied. Finite-element-method-based modeling electrical machine is carried out, ...

In order to solve the problem of unbalanced industrial development, promote industrial structure optimization and guide the orderly transfer of industries, Guangdong Province issued Decision on Promoting Industry Transfer and Labor Force Transfer and a series of other supporting policies. This article aims to analyze the framework, practical significance and effect of industrial transfer and la...

In this paper, the magnetic properties of carbon based material, graphene is studied, which is generated by laser ablation in cryogenic media. Transmission electron microscopy (TEM) and alternating gradient force magnetometer (AGFM) are applied to investigate the graphene morphology and magnetic properties, respectively. The graphene synthesized by the laser ablation method exhibits diamagnetic...

This study aims to improve the vehicle vertical dynamics performance in sprung and unsprung state for in-wheel-motor-driven electric vehicles (IWMD EVs) while considering unbalanced magnetic force effects. An integrated vibration elimination system (IVES) is developed, containing a dynamic vibration-absorbing structure between IWM suspension. It also includes an active suspension based on delay...

in this research using the theory of induction motor (um), a um with liquid as secondary part is planned and manufactured. the main objective for planning of this motor is to investigate the possibility of chemical liquids pumping such as liquid poison and acids. results of many laboratory tests are shown to conclude that pumping force in the manufactured pump is dependent on many factors su...