منابع مشابه
Thermal Modeling of Electrical Transformers
Thermal modeling of transformer is necessary to ensure the optimal design and cost of manufacture of transformer. Either of the empirical formulae available from the standards and practical measurement techniques used in the industries as an alternative to the formulae will not be able to answer the problem exactly and hence the development of software based thermal modeling techniques that use...
متن کاملElectrical Machines I
The speed of the machine has to be increased from zero and brought to the operating speed. This is called starting of the motor. The operating speed itself should be varied as per the requirements of the load. This is called speed control. Finally, the running machine has to be brought to rest, by decelerating the same. This is called braking. The torque speed characteristics of the machine is ...
متن کاملSc A1 Rotating Electrical Machines
PS1: Developments of Rotating Electrical Machines A1-101 A novel technique for refurbished induction motors’ efficiency estimation based on no-load tests M. AL-BADRI , P. PILLAY A1-102 Performance of high efficiency induction motors with power quality problems P. DONOLO, C. PEZZANI, A. BONELLI, A. AOKI, R. NEHLS, G. BOSSIO, G. GARCIA A1-103 Optimization of the ventilation system of a hydrogener...
متن کاملModitication Factor for Sizing Equation of Electrical Machines-Single and Three Phase Induction Motors(RESEARCH NOTE)
Comparison between the results from the design procedure based upon the value of D2L (volume of iron) and IEC standard used by manufacturers indicates that the basic design equation of electrical machines must be modified by a proper modification factor. This modification factor is evaluated for single- and three-phase induction motors and its variation with motor rating and poles number is obt...
متن کاملModel Order Reduction for Rotating Electrical Machines
The simulation of electric rotating machines is both computationally expensive and memory intensive. To overcome these costs, model order reduction techniques can be applied. The focus of this contribution is especially on machines that contain non-symmetric components. These are usually introduced during the mass production process and are modeled by small perturbations in the geometry (e.g., ...
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ژورنال
عنوان ژورنال: Nature
سال: 1954
ISSN: 0028-0836,1476-4687
DOI: 10.1038/174988a0