Matlab与FEMM联合仿真：Octave FEMM v1.2用户手册

FEMM

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–

Cduct

Electrical conductivity of the material in MS/m.

–

Lam d

Lamination thickness in millimeters.

–

Phi hmax

Hysteresis lag angle in degrees, used for nonlinear BH curves.

–

Lam fill

Fraction of the volume occupied per lamination that is actually ﬁlled with

iron (Note that this parameter defaults to 1 in the

femm

preprocessor dialog box because,

by default, iron completely ﬁlls the volume)

–

Lamtype

Set to

∗ 0 – Not laminated or laminated in plane

∗ 1 – laminated x or r

∗ 2 – laminated y or z

∗ 3 – magnet wire

∗ 4 – plain stranded wire

∗ 5 – Litz wire

∗ 6 – square wire

–

Phi hx

Hysteresis lag in degrees in the x-direction for linear problems.

–

Phi hy

Hysteresis lag in degrees in the y-direction for linear problems.

–

nstr

Number of strands in the wire build. Should be 1 for Magnet or Square wire.

–

dwire

Diameter of each of the wire’s constituent strand in millimeters.

Note that not all properties need be deﬁned – properties that aren’t deﬁned are assigned

default values.

•

mi addbhpoint(’blockname’,b,h)

Adds a B-H data point the the material speciﬁed by

the string

’blockname’

. The point to be added has a ﬂux density of

in units of Teslas and

a ﬁeld intensity of

in units of Amps/Meter.

•

mi clearbhpoints(’blockname’)

Clears all B-H data points associatied with the material

speciﬁed by

’blockname’

•

mi addpointprop(’pointpropname’,a,j)

adds a new point property of name

’pointpropname’

with either a speciﬁed potential

in units Webers/Meter or a point current

in units of Amps.

Set the unused parameter pairs to 0.

•

mi addboundprop(’propname’, A0, A1, A2, Phi, Mu, Sig, c0, c1, BdryFormat)

adds a new boundary property with name

’propname’

– For a “Prescribed A” type boundary condition, set the

A0, A1, A2

and

Phi

parameters

as required. Set all other parameters to zero.

– For a “Small Skin Depth” type boundary condtion, set the

to the desired relative

permeability and

Sig

to the desired conductivity in MS/m. Set

BdryFormat

to 1 and

all other parameters to zero.

– To obtain a “Mixed” type boundary condition, set

and

as required and

BdryFormat

to 2. Set all other parameters to zero.

– For a “Strategic dual image” boundary, set

BdryFormat

to 3 and set all other parameters

to zero.

– For a “Periodic” boundary condition, set

BdryFormat

to 4 and set all other parameters

to zero.

– For an “Anti-Perodic” boundary condition, set

BdryFormat

to 5 set all other parameters

to zero.

•

mi addcircprop(’circuitname’, i, circuittype)

adds a new circuit property with name

’circuitname’

with a prescribed current. The

circuittype

parameter is 0 for a parallel-connected circuit and 1 for a series-connected

circuit.

•

mi deletematerial(’materialname’)

deletes the material named

’materialname’

•

mi deleteboundprop(’propname’)

deletes the boundary property named

’propname’

•

mi deletecircuit(’circuitname’)

deletes the circuit named

circuitname

•

mi deletepointprop(’pointpropname’)

deletes the point property named

’pointpropname’

•

mi_modifymaterial(’BlockName’,propnum,value)

This function allows for modiﬁca-

tion of a material’s properties without redeﬁning the entire material (e.g. so that current can

be modiﬁed from run to run). The material to be modiﬁed is speciﬁed by

’BlockName’

The next parameter is the number of the property to be set. The last number is the value to

be applied to the speciﬁed property. The various properties that can be modiﬁed are listed

below:

propnum

Symbol Description

BlockName

Name of the material

1 µ

x (or r) direction relative permeability

2 µ

y (or z) direction relative permeability

3 H

Coercivity, Amps/Meter

4 J Source current density, MA/m

5 σ Electrical conductivity, MS/m

6 d

lam

Lamination thickness, mm

7 φ

hmax

Hysteresis lag angle for nonlinear problems, degrees

8 LamFill Iron ﬁll fraction

9 LamType 0 = None/In plane, 1 = parallel to x, 2=parallel to y

10 φ

Hysteresis lag in x-direction for linear problems, degrees

11 φ

Hysteresis lag in y-direction for linear problems, degrees

•

mi_modifyboundprop(’BdryName’,propnum,value)

This function allows for modiﬁca-

tion of a boundary property. The BC to be modiﬁed is speciﬁed by

’BdryName’

. The next

parameter is the number of the property to be set. The last number is the value to be applied

to the speciﬁed property. The various properties that can be modiﬁed are listed below:

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