16-06-2012, 11:32 AM
Analysis of Eddy Current Brakes using Maxwell 3D Transient
analysis_of_eddy_current_brakes.pdf (Size: 1.77 MB / Downloads: 59)
What are Eddy Current Brakes?
16-06-2012, 11:32 AM
Analysis of Eddy Current Brakes using Maxwell 3D Transient analysis_of_eddy_current_brakes.pdf (Size: 1.77 MB / Downloads: 59) What are Eddy Current Brakes?
04-06-2013, 02:58 PM
Analysis of Eddy Current Brakes using Maxwell 3D Transient Analysis of Eddy.pdf (Size: 1.77 MB / Downloads: 42) What are Eddy Current Brakes? Eddy current brakes, like conventional friction brakes, are responsible for slowing an object, such as rotating machinery, amoving train, or even a roller coaster There are two basic types: rotational and linear How do they work? A magnetic field induces a voltage in moving objects due to Faraday’s Law The induced voltage causes an eddy current to flow in any conducting objects This current produces a counter-opposing flux and Lorentz force to slow the moving object The current also produces ohmiclosses and significant heating Introduction The simulation eddy current brakes is difficult because: Physical effects such as nonlinear saturation, skin effects and motion induced eddy currents must be considered simultaneously A fine mesh is required due to very small skin depths A transient solution with time-stepping is necessary Multiple domain eddy current regions are needed including master/slave boundaries The results from three unique simulations will be shown while pointing out the challenges of each design and the methodology needed to allow the simulation to be successful How can they be analyzed? Maxwell 3D Transient solver which is well suited for magnetic problems with motion Solves transient magnetic fields caused by time-varying or moving electrical sources and permanent magnets Uses both linear and nonlinear materials Excitation can be DC, sinusoidal, and transient voltages or currents. An external schematic circuit is available Considers skin and proximity effects Considers motion-induced eddy currents Considers time-diffusion of magnetic fields Summary Maxwell 3D Transient can successfully solve complicated 3D simulations with motion-induced eddy currents in nonlinear materials DSO option can allow for a more efficient solution solving large projects in hours instead of weeks Design parameters can be varied using DSO to improve and optimize design |
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