An Improved Analytical Model of Permanent Magnet Eddy Current Magnetic Coupler Based on Electromagnetic-Thermal Coupling

Abstract

There is a serious nonlinear between the sensitive parameters and the transmission capacity of the permanent magnet eddy current magnetic coupler (PMEC), and how to establish the accurate analytical model is very important to study its characteristics, optimize design and improve control accuracy. In order to solve the problem that the accuracy of analytical model deteriorates under the variable parameters of the PMEC, based on the electromagnetic-thermal theory, the electromagnetic-thermal nonlinearity of materials, such as the thermal effect of magnetic properties, the thermal effect of permeability, the thermal effect of conductivity, the magnetic saturation effect, the skin effect, the eddy current inductive reactance, have been deeply studied in this paper. On this basis, the multi-field coupling analytical model of the PMEC sensitive parameters and material electromagnetic thermal nonlinearity is established by using the magnetic equivalent circuit theory and lumped parameter thermal network method. Combined with numerical simulation and experiment, the research on electromagnetic characteristics, temperature characteristics and transmission characteristics of the PMEC are carried out. The comparative study shows that the proposed analytical model can accurately analyze the electromagnetic characteristics, temperature characteristics and transmission characteristics of the PMEC without any correction coefficient under different parameters. The accuracy of the analytical model with variable parameters is effectively solved, and the model theory of the PMEC is improved. The accurate analytical modeling method has laid theoretical foundation for the rapid optimization design and wide application of the PMEC.

Theoretical Computational Model for Cylindrical Permanent Magnet Coupling

“…Therefore, the rated power of the drive motor of the test bench must exceed five times the rated power of the PMC to test its performance under extreme working conditions. In most previous studies, the rated power of the drive motor used in the test bench was close to the power of the PMC [32,33]. Such power can only test the characteristics of the PMC when the slip rate is within 0.3; it cannot test the ultimate performance of the coupling.…”

A Review of Recent Developments in Permanent Magnet Eddy Current Couplers Technology

“…The basic structures of the two types are shown in Figure 1; the PM rotor part consists of PM and back iron, and the conductor rotor part consists of conductor disk (disc) and back iron. PMs are usually selected from rare earth magnets such as Nd2Fe14B, which have a high maximum The PMECCs transmit torque by creating a magnetic field through the eddy currents induced in the conductor rotor, and generate a large amount of heat while transmitting torque [30][31][32][33][34]. In particular, when used as a braking device, the heat of the device will cause the temperature to rise severely, which may lead to the permanent demagnetization of the PM; so, it is necessary to model the thermal field to facilitate the design of heat dissipation [35][36][37].…”

“…torque [30][31][32][33][34]. In particular, when used as a braking device, the heat of the device will cause the temperature to rise severely, which may lead to the permanent demagnetization of the PM; so, it is necessary to model the thermal field to facilitate the design of heat dissipation [35][36][37].…”

Electromagnetic Modeling and Analysis of Multimaterial Cookware for Domestic Induction Heating

“…In the literature, many papers deal with electromagnetic modeling in IH. Most of them are focused on industrial applications of induction heating with solenoidal coils [24], [25] or other applications based on eddy currents [26], [27], [28], [29]. Some specialized works in domestic IH that allow to obtain the R eq and L eq are [30], [31], and [32].…”