scholarly journals Method to Predict the Non-Uniform Potential Distribution in Random Electrical Machine Windings under Pulse Voltage Stress

Energies ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 358
Author(s):  
Alexander Hoffmann ◽  
Bernd Ponick
Keyword(s):  
Equivalent Circuit ◽  
Potential Distribution ◽  
Solution Process ◽  
Practical Method ◽  
Electrical Machine ◽  
Stator Core ◽  
Design Data ◽  
Potential Oscillations ◽  
Voltage Stress ◽  
The Time Domain

This article describes a practical method for predicting the distribution of electric potential inside an electrical machine’s winding based on design data. It broadens the understanding of winding impedance in terms of inter-winding behavior and allows to properly design an electrical machine’s insulation system during the development phase. The predictions are made based on an frequency-dependent equivalent circuit of the electrical machine which is validated by measurements in the time domain and the frequency domain. Element parameters for the equivalent circuit are derived from two-dimensional field simulations. The results demonstrate a non-uniform potential distribution and demonstrate that the potential difference between individual turns and between turns and the stator core exceeds the expected values. The findings also show a link between winding impedance and potential oscillations inside the winding. Additionally, the article provides an overview of the chronological progression of turn-based models and shows how asynchronous multiprocessing is used to accelerate the solution process of the equivalent circuit.

scholarly journals Estimation of the Equivalent Circuit Parameters of Induction Motors by Laboratory Test

Machines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 340
Author(s):  
Moshe Averbukh ◽  
Efim Lockshin
Keyword(s):  
Equivalent Circuit ◽  
Induction Motors ◽  
Simple Algorithm ◽  
Accurate Method ◽  
Open Circuit ◽  
Parameters Estimation ◽  
Electrical Machine ◽  
Power Prediction ◽  
Equivalent Circuit Parameters

The determination of equivalent circuit parameters for AC induction motors represents an important task in an electrical machine laboratory. Frequently used open-circuit and short current tests answer these requirements. However, the results have a low accuracy. This becomes especially obvious when the equivalent circuit is applied for the motor current and power prediction. The main obstacles in this circumstance lie in the difficulty of providing a pristine open-circuit test, the lack of which causes errors in parameter estimation. A much more accurate approach can be carried out with a test including several output points with measurements of the motor torque, velocity, current, and power magnitudes. Nevertheless, a relatively simple and accurate method to ensure determining parameters for such tests does not exist. This article tries to provide such a method by an approach based on Kloss’s simplified equation and the Thevenin theorem. The significant novelty of the method is the specially selected synergetic interaction between the analytical and numerical approaches, which give a relatively simple algorithm with a good accuracy and a convergence of the parameters’ estimation.

scholarly journals HIGH-SPEED ELECTRICAL MACHINE WITH RADIAL MAGNETIC FLUX AND STATOR CORE MADE OF AMORPHOUS MAGNETIC MATERIAL. TECHNOLOGIES, TRENDS AND PERSPECTIVE OF DEVELOPMENT

2018 ◽  
Vol 86 ◽  
pp. 69-82 ◽  
Author(s):  
Flur R. Ismagilov ◽  
Wenming Tong ◽  
Viacheslav Evgenievich Vavilov ◽  
Denis Valerievich Gusakov ◽  
Valentina V. Ayguzina
Keyword(s):  
Magnetic Material ◽  
Magnetic Flux ◽  
High Speed ◽  
Electrical Machine ◽  
Stator Core ◽  
Amorphous Magnetic Material
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