max3d transient
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Maxwell 3D Transient
Ansoft Corporation
Pittsburgh, Sept. 2001
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3D Transient
3D Transient
Material
• nonlinear
• permanent magnet• anisotropy (linear)
• perfect conductor
Material• nonlinear
• permanent magnet• anisotropy (linear)• perfect conductor
Boundary• H field
• insulating• symmetry• matching
Boundary• H field
• insulating• symmetry• matching
Solution setup
• eddy effect• force / torque• core loss• restart
Solution setup
• eddy effect• force / torque
• core loss
• restart
Source
• current density• current• voltage• external
Source
• current density• current• voltage
• external
Circuit
• direct coupling• internal, or• external (Schematic)
Circuit• direct coupling• internal, or
• external (Schematic)
Winding• solid
• stranded• arbitrary configuration
Winding
• solid• stranded• arbitrary configuration
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What can we get?
Data Plot• winding current• winding induced voltage• winding flux linkage
• ohmic power loss• core loss (include hysteresis)• torque / force (multi groups)• input source• branch current
• node voltage
Field Plot• B vector• H vector
• J vector• various energies• macro support• at any specified instant
+3D Transient Schematic
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Test Problem Comparedwith RZ Model
corecoil
plate
yoke
(magnet)
Induced Voltage
Current tds3drz2d
tds3drz2d
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Examine Induced EddyCurrent
t = 0.025Source Current
Induced Eddy Current
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3D Transient with Schematic
Three phase power transformer
Rectifier Circuit
FEA internally coupledwith circuit elements
Coupled with external circuits using Schematic
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B Vector Plot
t = 0.008
t = 0.011
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Simulation Results
Secondary winding current
Output voltage from rectifierOutput voltage from rectifier
Notch caused byswitching on-off
Current
Induced voltage
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hysteresis loss eddy loss excess loss
w Applicable to Electric Steel and Power Ferrite
w Consider hysteresis minor loop
w Based on available manufacturer coefficients
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Device Geometry and SourcePeak
Source currentCoil
Aluminum
cylinder
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Force distribution on AluminumCylinder (N/m3)
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Force distribution on the Coil
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Current distribution in theAluminum Cylinder
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Vector plot of Induced Current inAluminum Cylinder
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Eddy Currents Induced in anAluminum Plate
Power loss (eddy solver) = 4.60 W
Power loss (transient) = 4.46 W
Coil
Aluminum Plate
Time average values:
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Position sensor analysis
Permanent magnet
Coil (2 KHz)Permeable core
Magnetic flux density plot
(0.15 mm thick)
Eddy currents in the core