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2D model of axial-flux eddy current brakes with slotted conductive disk rotor

An electromagnetic 2D model of axial-flux eddy current brakes with slotted conducting disk rotor is proposed. The 2D model takes into account variations in magnetic field strength and eddy current densities in radial and tangential directions. However, the proposed model neglects nonuniformity of primary field created by an inductor because this can be evaluated from separate consideration of the primary field and corrected by a coefficient that enhance well-known Carter coefficient. The using of dimensionless variables gives a main parameter — dimensionless frequency that characterize intensity of electromagnetic process and match with Laithwaite goodness factor and the Reynolds number for MHD machines. For the plain disk rotor without slots, the 2D model was simplified a 1D model that was solved by an analytical method. The 2D model was solved by the numerical finite-difference method. Finally, the torque-speed characteristics was obtained and they show that the torque of the brakes with slotted disk rotor is more the torque of the brake with plain rotor in 1.1–1.2 times; the slope of the torque-speed characteristic increases on 3–10 %.