Performance Analysis and Experimental Study of Permanent Magnet Linear Eddy-Current Brake
In order to make up for the limitations of electromagnetic linear eddy-current brake in terms of high weight and heat generation,a prototype of permanent magnet eddy-current brake is designed in this paper.The formulas of braking force and attractive force are deduced based on the equivalent magnetic circuit method,and they are used to guide the selection of initial values of design parameters.Through FEM simulation,the braking characteristics of permanent magnet and electromagnetic eddy-current brake are compared and analyzed.A test device is built to measure the braking characteristics at different speeds and various air gaps.Test results are compared with the analytical curves and FEM curves,and the error is analyzed.The results show that under the premise of the same length as the electromagnetic eddy-current brake,the braking force generated by permanent magnets is comparable with that of electromagnets.But when the train's speed is at the range of 200 km/h to 400 km/h,the permanent magnet eddy-current brake generates a more stable braking force and a lower attractive force.The test curves are consistent with the analytical results and the FEM results,and the FEM is more accurate than the analytical calculation.When the air gap reaches 70mm,both the braking force and the attractive force tend to be 0,and this release height is consistent with the value of the electromagnetic eddy-current brake.From the perspective of braking force and attractive force,the permanent magnet linear eddy-current brake is suitable for application in high-speed trains.
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