Design and Realization of Double-star Squirrel Cage Induction Motor

Abstract

This article presents an in-depth study and a systematic design of a double-star squirrel-cage induction motor with a rated power of 3 kW and a synchronous speed of 3000 rpm. The proposed design method is supported by a thorough finite element analysis performed using electromagnetic simulation tools. The design calculations and simulation results were validated through the fabrication and experimental testing of a prototype of the machine. The test results show excellent agreement with the theoretical predictions and numerical simulations, thereby confirming the effectiveness and accuracy of the proposed design method. In fact, the calculated stator resistance R₁ at 20°C is 13.24 Ω, while the simulated value is 13 Ω. The experimental measurement taken at 23 °C yields a resistance of 13.22 Ω. The expected rotational speed is 2880 rpm, and the simulation speed is N_r = 2940 rpm, whereas the rotor speed obtained during the experimental tests is 2931 rpm. The rated power factor cos φ = 0.84, while the value obtained experimentally is 0.82. This deviation is small and is consistent with the expected behavior of the machine.
The results obtained highlight a strong correlation between theoretical analyses, numerical simulations, and experimental tests, thereby demonstrating the suitability of the double-star squirrel-cage induction motor configuration for high-performance industrial applications.