Thermal network model of rotary eddy current braking system for transient thermal process analysis

The system parameters of the braking process of a rotary eddy current brake (RECB) exhibit time-varying characteristics and alternate transformations of the heat source (HS) and non-heat source (NHS) regions of the brake disc. A full-structure equivalent thermal network model for the RECB system is established, considering its physical structure. In addition, a calculation method is proposed to update the temperature of the rotating unit with a finite stepping distance. The method employs the transient process of electromagnetic thermal coupling on the brake disc, distinguishes between the thermal processes in the HS and NHS regions of the brake disc, and simulates the temperature distribution of the entire braking system. The proposed calculation method is verified via rig tests, and the effects of brake temperature rise on braking performance are assessed. The method can be used for optimal design, heat capacity analysis, and life analysis of brakes.