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With the increasing of the power from KW to MW for wind turbines, effective cooling measures are introduced for keeping the system operating within the allowable temperature. Taking a 1mw wind turbine as an example, this paper introduces the structural features and the ventilation way of it, the CFD(Computational Fluid Dynamics) software is adopted to analyze the fluid field and the temperature field...
In this paper, three dimensional temperature field in an entire automobile claw-pole generator is studied. Based on computational fluid dynamics (CFD) principles of limited volume, the mathematical model equations including the three-dimensional turbulence flows and heat transfer describing the entire generator heat and rotor high-speed rotation are solved. The finite element method is used and the...
Ram air turbines, deployed in the external airflow during flight, are used as emergency power sources to feed the vital apparatuses required for governing aircrafts in case of failure of main supply systems. Such turbines mostly drive electric generators usually connected to a DC bus supported by emergency batteries, which supplies the vital avionic systems. Such generators must then feature high...
A-single-phase reluctance generator treated in this paper is a kind of a small steam turbine generator. The stator has both 4-pole field and 8-pole armature windings and the iron core has residual magnetism. The rotor is 4-pole and skewed. The no-load induced voltage waveform is computed by using the finite-element method. The computed values taking skew into account agree well with the experimental...
Take the automobile generator's stator as the studying object, fully considered aeolotropy of ferrite core's thermal conductivity, coupling between the ferrite core and winding. Using the finite element method, that computed dissimilar condition's 3D temperature distribution of stator under the digital simulator. Comparing with the field data, the computational method and the result are proved accurate.
The field circuit coupling time-stepping FEM is proposed to calculate the no-load EMF waveform of salient pole machine, according to the Powerformer prototype, the no-load EFM waveform of Powerformer is calculated, and the effects of different damper windings constraints are considered during calculation, and then the results are compared with the experimental value. It shows that different constraints...
This paper presents a fault detection system based on multilayer feedforward artificial neural network (ANN) for detection of one or several broken parallel coils of a small generator. This fault type cannot visibly influence on machinepsilas normal performance and since the performance of a faulty machine with broken coils is similar to that of a healthy one with unbalance load, therefore detection...
This paper presents the operational principles, design and transient analysis of a new three-phase 12/14-pole doubly salient electrical magnet (DSEM) generator for its application in direct-driven wind power generation. Design equations, finite element and dynamic analysis of the new generator are described. The 12/14-pole DSEM generator with constant self-inductance has lower voltage ripple compared...
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