Analytical Modeling of a Novel Counter-Rotating Dual-Rotor Axial Flux Permanent Magnet Wind Turbine Generator

Abstract

Counter-rotating dual-rotor wind turbine generators can produce twice the electrical power compared to conventional generators. This paper presents a new counter-rotating dual-rotor axial flux permanent magnet (CRDR-AFPM) synchronous machine. The key is to analytically analyze the operation of the proposed CRDR-AFPM structure. For the design, modeling, analysis, and optimization of the machine performance characteristics, the electrical equivalent circuit can be used. Therefore, first, the electrical equivalent circuit parameters of the proposed structure are determined analytically. To achieve this objective, Maxwell’s equations are employed. The precision of the obtained formulas for calculating the electrical equivalent circuit parameters of the machine is confirmed using the finite element method. A 50 W machine with the proposed structure is selected as the case study. A comprehensive analysis of the electromagnetic performance of the case study machine is performed, which includes evaluation of novel structure performance under full load operating conditions, the assessment of overload capability, examination of overspeed capability, analysis of voltage regulation, and evaluation of its ability to withstand demagnetization. The attained results from the Finite Element (FE) simulations are in good agreement with the results of the proposed formulas, which confirms the accuracy of the proposed analytical formulas. Furthermore, the voltage regulation for rated load is about 12%, while for 40% overload, the voltage regulation increases to 20%. In addition, the overspeed condition has no significant effect on the voltage regulation factor. The results confirm the good demagnetization withstanding capability of the case study machine under an overload condition.

Cite this article as: R. Mirzahosseini, “Analytical modeling of a novel counter-rotating dual-rotor axial flux permanent magnet wind turbine generator,” Electrica, 2026, 26, 0172, doi: 10.5152/electrica.2026.24172.