Abstract
This paper deals with a complete finite-element analysis procedure for squirrel cage induction motors, including the presence of skewing and the iron losses evaluation. The machine is analyzed performing only magneto-static finite element analyses. Saturation phenomena are carefully considered in any operating condition, avoiding long time-stepping analyses. The synergy between analytical and finite element model leads to a rapid and precise estimation of the rotor induced current, saving computational time. Furthermore, the procedure proposed in this paper allows the motor performance to be directly derived, without the preliminary knowledge of the machine equivalent circuit. In order to complete the analysis, skewing effect is included, using the 2-D multi-slice technique, based on static simulations. Experimental tests are carried out and reported in order to verify analysis results.
Highlights
Accepted: 2 March 2021Despite the conventional structure of the Induction Motor (IM), the study of electromagnetic phenomena occurring in the machine is not immediate
The method described in this paper allows a very fast induction motor analysis using magneto-static finite element analyses
The rotor current is computed linking the analytical laws in the rotor field-oriented reference frame with the precise estimation of the parameters from the finite element model
Summary
Despite the conventional structure of the Induction Motor (IM), the study of electromagnetic phenomena occurring in the machine is not immediate. For this reason, the most common way to obtain motor performance is using Time Domain (TD) Finite Element. The IM still plays an important role in the market, and accurate tools for its analysis and design are of great interest across industries [2,3]. An accurate procedure is proposed: IM performance is derived by performing Magneto-Static (MS) FEA, in which both stator and rotor currents are imposed The FEA can improve the parameters estimation, considering the skin effect in the rotor bars, and the saturation of the magnetizing inductance [6].
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