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
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