Fast and efficient simulation of the dynamical response of coaxial magnetic gears through direct analytical torque modelling

Tzouganakis, Panteleimon; Gakos, Vasilios; Kalligeros, Christos; Tsolakis, Antonios; Spitas, Vasilios

doi:10.1016/j.simpat.2022.102699

Cited by 10 publications

(15 citation statements)

References 22 publications

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“…The relationship (11) allows the analytical calculation of the desired input and output torques of each magnetic gear. The torque 𝑇 𝑖𝑛 developed by inner rotor of each gear is also defined as ( 12) [28]. 𝐵 𝜃𝑜𝑢𝑡 𝑑𝜃 = 0 the simplified analytical expression of ( 12) is (13).…”

Section: Methodology For Comparing the Ccmg And Dscmgmentioning

confidence: 99%

Contribution to the comparison of conventional concentric magnetic gear and double stage concentric magnetic gear for high power offshore wind applications

Philippe,

Gilles,

Macaire

2024

IJAPE

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Nowadays, the replacement of mechanical technologies by magnetic technologies has several advantages. Therefore, in this paper, we compare in an indirect drive chain the conventional concentric magnetic gear (CCMG) and the double-stage concentric magnetic gear (DSCMG) used as a speed multiplier for a high-power offshore wind turbine. This comparison is performed for the same gear ratio and the same torque at the input of both magnetic gears to obtain the same torque values at the output of each gear. The goal is to determine which one has the smaller amount of magnet and the higher volumetric torque density. After the calculation of the gear ratio, a first choice of geometrical parameters is adopted. Several simulations carried out by the finite element method (FEM) allowed to obtain the desired torques and to fix the final geometrical parameters of each magnetic gear. The results obtained show that the DSCMG has both the smallest magnet volume and the highest volumetric torque density compared to the CCMG.

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Section: Methodology For Comparing the Ccmg And Dscmgmentioning

confidence: 99%

Contribution to the comparison of conventional concentric magnetic gear and double stage concentric magnetic gear for high power offshore wind applications

Philippe,

Gilles,

Macaire

2024

IJAPE

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“…The use of magnetic gearboxes is promising [22,23]. They make it possible to abandon the mechanical gearbox in favor of a magnetic gearbox and use a classic highspeed and more compact, cheap, affordable, and easytomaintain electric generator on the output shaft of the wind turbine [24,25].…”

Section: Electrical Complexes and Systemsmentioning

confidence: 99%

Mathematical modeling of a magnetic gear for an autonomous wind turbine

Kovalenko,

Tkachuk

et al. 2024

Nauk. visn. nat. hirn. univ.

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Purpose. Development of a two-dimensional field mathematical model of a magnetic gearbox operating as part of a low-power wind turbine for the purpose of evaluating its parameters and characteristics and optimizing geometric parameters from the point of view of electromagnetic torque pulsations. Methodology. To carry out the research, the methods of the general theory of electromechanical energy converters, numerical methods of mathematical modeling based on the finite element method, numerical solution of nonlinear differential equations, and methods of spectral analysis to estimate pulsations of the electromagnetic torque were used in the work. Findings. The paper developed a two-dimensional numerical field mathematical model of a magnetic gearbox for an autonomous wind turbine. The model was developed to evaluate the parameters and characteristics of the magnetic gear, as well as to evaluate the influence of the design parameters on the magnitude of the electromagnetic torque and the magnitude of the pulsations of the electromagnetic torque. The effect of the configuration of permanent magnets, the parameters of the ferromagnetic inserts of the magnetic flux modulator and the size of the air gap was investigated in the paper. The obtained results show that there is an optimal configuration of permanent magnets and ferromagnetic elements of the magnetic flux modulator in which the maximum electromagnetic torque and minimum pulsations are achieved. Changing the parameters of the magnetic system affects the dynamics of the magnetic gear, its reliability and efficiency, therefore configuration optimization is an important task in the design, development and implementation of such systems. Originality. A two-dimensional field mathematical model of the magnetic gear has been developed, which makes it possible to estimate the change in its parameters and characteristics when the geometric dimensions change. This allows investigating the influence of various parameters of the magnetic system, such as the height of the permanent magnets and the width of the ferromagnetic inserts, on the electromagnetic torque. This makes it possible to obtain the optimal configuration of the system to achieve the optimal value of the torque and minimal pulsations and to determine the regularity of the change of the electromagnetic torque and other parameters of the gearbox under different operating modes in the future. Practical value. The simulation results indicate the prospects of industrial implementation of magnetic gaers as part of a wind power plant, and the obtained research results indicate the possibility of optimizing the design of magnetic gears in order to increase their reliability and efficiency.

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“…The vector magnetic potential can be easily determined after the scalar magnetic potential φ calculation. The scalar magnetic potential is computed by dividing the CMG into regions, calculating the φ produced by each rotor PM to all regions, and superimposing them [7]. In Figure 2, the model that refers to the effect of the inner PMs is illustrated.…”

Section: Computation Of Eddy Current Losses Of Pms Using a 2d Analyti...mentioning

confidence: 99%

“…Coaxial magnetic gears (CMGs) were first introduced two decades ago by Atallah et al [3], and since then there has been a growing interest in their use in different applications, including power generation [4,5] and aerospace [6]. The analytical solutions of the scalar magnetic potential of CMGs and the subsequent magnetic flux densities and induced torques in the two rotors were computed analytically by Tzouganakis et al [7]. However, significant issues regarding the torque density, the slippage, and power losses due to eddy currents are present in CMGs, which limit their wider application in the industry [7].…”

Section: Introductionmentioning

confidence: 99%

“…The analytical solutions of the scalar magnetic potential of CMGs and the subsequent magnetic flux densities and induced torques in the two rotors were computed analytically by Tzouganakis et al [7]. However, significant issues regarding the torque density, the slippage, and power losses due to eddy currents are present in CMGs, which limit their wider application in the industry [7]. In particular, eddy current losses have been a significant issue in CMGs, especially at higher rotational speeds [1].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Detailed Investigation of the Eddy Current and Core Losses in Coaxial Magnetic Gears through a Two-Dimensional Analytical Model

Nikolarea,

Tzouganakis,

Gakos

et al. 2024

MCA

Self Cite

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This work introduces a 2D model that calculates power losses in coaxial magnetic gears (CMGs). The eddy current losses of the magnets are computed analytically, whereas the core losses of the ferromagnetic segments are computed using an analytical–finite element hybrid model. The results were within 1.51% and 3.18% of those obtained from an FEA for the eddy current and core losses in the CMG for an indicative inner rotor speed of 2500 rpm. In addition, the significance of the circumferential magnet segmentation is demonstrated in the CMGs. Furthermore, a parametric investigation of the efficiency of the system for different applied external loads is carried out. Finally, a mesh sensitivity analysis is performed, along with the computation of the average power losses throughout one full period, resulting in an at least 80% reduction in computational costs with a negligible effect on accuracy. The developed model could be a valuable tool for the minimization of power losses in CMGs since it combines high accuracy with a low computational cost.

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Fast and efficient simulation of the dynamical response of coaxial magnetic gears through direct analytical torque modelling

Cited by 10 publications

References 22 publications

Contribution to the comparison of conventional concentric magnetic gear and double stage concentric magnetic gear for high power offshore wind applications

Contribution to the comparison of conventional concentric magnetic gear and double stage concentric magnetic gear for high power offshore wind applications

Mathematical modeling of a magnetic gear for an autonomous wind turbine

Detailed Investigation of the Eddy Current and Core Losses in Coaxial Magnetic Gears through a Two-Dimensional Analytical Model

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