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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