17.7 Magnetization-Vector Source

17.7 Magnetization-Vector Source#

Defines permanent magnets in finite elements using a magnetization vector. MAGNET is a source term that specifies the magnetization vector of permanent magnets.

Input settings#

MAGNET(17.7) JSON key: magnetization-vector source object

SERIES_ID(17.7) Series ID.

INPUT_TYPE(17.7) Option for specifying the magnetization vector.

Uniform magnetization input

MAT_ID(17.7.1) Property ID of the target region.

COORD_ID(17.7.1) Coordinate system of the magnetization vector.

MXYZ(17.7.1) Components of the magnetization vector.

CHECK_PERMEANCE(17.7.1) Permeance used to calculate the demagnetized volume of a permanent magnet.

Element-by-element magnetization input

MAT_ID(17.7.2) Property ID of the target region.

COORD_ID(17.7.2) Coordinate system of the magnetization vector.

READ_OPTION(17.7.2) Magnetization-vector read option.

ELEM_ID(17.7.2) Element ID.

MXYZ(17.7.2) Components of the magnetization vector.

INITIAL_MAGNETIZATION_FILE_NAME(17.7.2) File name providing the initial magnetization vectors defined in ATLAS format. Default file name: initial_magnetization.dat.

Sinusoidal-function input

NO_POLES(17.7.3) Number of poles of the magnetization vector.

ANGLE(17.7.3) Reference angle of the magnetization vector.

ORDERS(17.7.3) Harmonic orders of the magnetization vector.

AMPLITUDE(17.7.3) Normalized amplitude for each ORDERS value of the magnetization vector.

MAT_ID(17.7.3) Material ID assigned to the region.

COORD_ID(17.7.3) Coordinate system of the magnetization vector.

MXYZ(17.7.3) Components of the magnetization vector.

Equation input

MAT_ID(17.7.4) Material ID assigned to the region.

COORD_ID(17.7.4) Coordinate system of the magnetization vector.

Nonlinear analysis using a permanent-magnet demagnetization curve

MAT_ID(17.7.5) Material ID assigned to the region.

TYPE(17.7.5) Analysis option using a permanent-magnet demagnetization curve.

BH_MAGNET_CURVE_ID(17.7.5) Demagnetization-curve ID.

MU(17.7.5) Relative permeability in the hard-magnetization direction.

COORD_ID(17.7.5) Coordinate system of the magnetization vector.

MXYZ(17.7.5) Components of the magnetization vector.

Input format#

Text-format section
Type:

Fixed parameter set 1

Number of lines:

1

Number of parameters:

4

Text format#
* MAGNET * SERIES_ID * TIME_ID * NO_MAT_ID *
MAGNET         I          I          I

JSON format#

JSON format from 2024.11#
"17_Field_Source" :
[
    {
        "MAGNET" :
        {
            "SERIES_ID" : I,
            "TIME_ID" : I,
            "INPUT_TYPE" : I,
            "data" :
            [
                {
                    "MAT_ID" : I,
                    "COORD_ID" : I,
                    "MXYZ" : [ E, E, E ]
                }
            ]
        }
    }
]

Detailed description#

MAGNET defines permanent magnets in the finite-element mesh using magnetization vectors.

MAGNET#

MAGNET(17.7)#

JSON key: magnetization-vector source object

Text-format section
Fixed parameter set 1#
[row, col] = [1, 1]
Type:

String (S)

Description:

Specifies the magnetization-vector source MAGNET.

SERIES_ID#

SERIES_ID(17.7)#
Text-format section
Fixed parameter set 1#
[row, col] = [1, 2]
Type:

Integer (I)

Description:

Source-term identifier.

TIME_ID#

TIME_ID(17.7)#
Text-format section
Fixed parameter set 1#
[row, col] = [1, 3]
Type:

Integer (I)

Description:

Time-definition ID used when a time-dependent source is specified. TIME_ID(17.6)

For constant magnetization, set the time-definition ID TIME_ID(17.6) that provides the constant value.

Text-format section

NO_MAT_ID (text format only)

Fixed parameter set 1#
[row, col] = [1, 4]
Type=I

For INPUT_TYPE = 0, 2, 3, or 4, the number of material IDs for elements to which magnetization vectors are assigned. For INPUT_TYPE = 1, the number of elements to which magnetization vectors are assigned.

INPUT_TYPE#

INPUT_TYPE(17.7)#
Text-format section
Fixed parameter set 1#
[row, col] = [1, 5]
Magnetization-vector input option#

Value

Description

0

Assigns a uniform magnetization vector for each material ID.

1

Assigns a magnetization vector to each element. Only one material ID is used. When READ_OPTION = 1, multiple material IDs may be used.

2

Assigns sinusoidal-function input for each material ID.

3

Assigns equation input for each material ID.

4

Performs nonlinear analysis using a demagnetization curve.

5

Performs nonlinear analysis using a temperature-dependent demagnetization curve.

Caution

Using =4 requires the <PM Demagnetization module>.

Using =4 or 5 requires the <TEMP_DEPEND module>.

data#

data(17.7)#
JSON key:

Magnetization-vector source data

In JSON format, enter the data specified by INPUT_TYPE in data.

data is an array with one entry for each MAGNET element.

17.7.1 Uniform magnetization input#

When INPUT_TYPE = 0, specify a magnetization vector for each material ID.

Text-format section
Type:

Fixed parameter set 1

Number of lines:

1

Number of parameters:

5

Text format#
*  MAT_ID * COORD_ID * MX or MR * MY or MT * MZ * CHECK_PERMEANCE *
     2      1            1            0            0            4.2
JSON format from 2024.11#
            "data" :
            [
                {
                    "MAT_ID" : 2,
                    "COORD_ID" : 1,
                    "MXYZ" : [ 1.0, 0.0, 0.0 ],
                    "CHECK_PERMEANCE" : 4.2
                }
            ]
MAT_ID#
MAT_ID(17.7.1)#
Text-format section
Fixed parameter set 1#
[row, col] = [2, 1]
Type:

Integer (I)

Description:

Material ID of the elements to which the magnetization vector is assigned ( MAT_ID(16.1) ).

COORD_ID#
COORD_ID(17.7.1)#
Text-format section
Fixed parameter set 1#
[row, col] = [2, 2]
Type:

Integer (I)

Description:

Local coordinate system in which the magnetization vector is defined ( COORD_ID(12) ).

MXYZ#
MXYZ(17.7.1)#
Text-format section
Fixed parameter set 1#
[row, col] = [3, 1]
Type:

Real array (E)

Number:

3

Unit:

T

Description:

Magnetization-vector components in each direction of the local coordinate system.

CHECK_PERMEANCE#
CHECK_PERMEANCE(17.7.1)#
Text-format section
Fixed parameter set 1#
[row, col] = [2, 6]
Type:

Real (E)

Description:

Permeance used to calculate the demagnetized volume of the permanent magnet.

Note

Release_2026_09

CHECK_PERMEANCE is enabled by setting CHECK_PERMEANCE in 11. Output Options to On. The output file then reports (magnet volume - demagnetized magnet volume) / magnet volume as the fraction of the magnet volume that has not been classified as demagnetized at operating points below CHECK_PERMEANCE.

17.7.2 Element-by-element magnetization input#

When INPUT_TYPE = 1, specify a magnetization vector for each element.

Text-format section
Type:

Fixed parameter set 1

Number of lines:

1

Number of parameters:

5

Text format#
* MAGNET * SERIES_ID * TIME_ID * NO_MAT_ID * INPUT_TYPE *
MAGNET       1             1          2       1
*  MAT_ID * COORD_ID * READ_OPTION *
    1         0             0
*  ELM_ID * MX or MR * MY or MT * MZ *
     1      0            0            1
     2      0            0            1
JSON format from 2024.11#
        "MAGNET" :
        {
            "SERIES_ID" : 1,
            "TIME_ID" : 1,
            "INPUT_TYPE" : 1,
            "comment" : "Linear magnetization vector input",
            "MAT_ID" : 1,
            "COORD_ID" : 0,
            "READ_OPTION" : 0,
            "data" :
            [
                {
                    "ELEM_ID" : 1,
                    "MXYZ" : [ 0.0, 0.0, 1.0 ]
                },
                {
                    "ELEM_ID" : 2,
                    "MXYZ" : [ 0.0, 0.0, 1.0 ]
                }
            ]
        }
MAT_ID#
MAT_ID(17.7.2)#
Text-format section
Fixed parameter set 1#
[row, col] = [2, 1]
Type:

Integer (I)

Description:

Material ID of the elements to which the magnetization vector is assigned ( MAT_ID(16.1) ).

COORD_ID#
COORD_ID(17.7.2)#
Text-format section
Fixed parameter set 1#
[row, col] = [2, 2]
Type:

Integer (I)

Description:

Local coordinate system in which the magnetization vector is defined ( COORD_ID(12) ).

READ_OPTION#
READ_OPTION(17.7.2)#
Text-format section
Fixed parameter set 1#
[row, col] = [2, 3]
Magnetization-vector read option#

Value

Description

0

Define this in the input file.

1

Specifies the file name containing the initial magnetization vectors defined in ATLAS format. Default file name: initial_magnetization.dat. COORD_ID(17.7.2) has no effect.

When READ_OPTION = 0, enter the following data.

ELEM_ID#

ELEM_ID(17.7.2)#
Text-format section
Fixed parameter set 2#
[row, col] = [2, 1]
Type:

Integer (I)

Description:

Element number in the input mesh data.

MXYZ#

MXYZ(17.7.2)#
Text-format section
Fixed parameter set 2#
[row, col] = [2, 2]
Type:

Real array (E)

Number:

3

Unit:

T

Description:

Magnetization-vector components in each direction of the local coordinate system.

When READ_OPTION = 1, enter the following data.

INITIAL_MAGNETIZATION_FILE_NAME (JSON format)#

INITIAL_MAGNETIZATION_FILE_NAME(17.7.2)#

File name containing the initial magnetization vectors defined in ATLAS format. Default file name: initial_magnetization.dat.

17.7.3 Sinusoidal-function input#

When INPUT_TYPE = 2, specify sinusoidal-function input for each material ID.

Text-format section
Type:

Fixed parameter set 1

Number of lines:

2 + NO_DATA

Number of parameters:

5

Text format#
*  NO_ORDERS   *    NO_POLES  *   ANGLE(deg)   *
    1     4     45.00
* ORDER * AMPLITUDE *
    1  1.000000000
*  MAT_ID * COORD_ID *  MX or MR  *   MY or MT  *      MZ   *
    101      0            1            0            0
    102      0            0            1            0
    103      0           -1            0            0
    104      0            0           -1            0
JSON format from 2024.11#
    "MAGNET" :
    {
        "SERIES_ID" : 1,
        "TIME_ID" : 1,
        "INPUT_TYPE" : 2,
        "comment" : "Linear magnetization by sin function input",
        "NO_POLES" : 4,
        "ANGLE" : 45.0,
        "ORDERS" : [ 1 ],
        "AMPLITUDES" : [ 1.0 ],
        "data" :
        [
            {
                "MAT_ID" : 101,
                "COORD_ID" : 0,
                "MXYZ" : [ 1.0, 0.0, 0.0 ]
            },
            {
                "MAT_ID" : 102,
                "COORD_ID" : 0,
                "MXYZ" : [ 0.0, 1.0, 0.0 ]
            },
            {
                "MAT_ID" : 103,
                "COORD_ID" : 0,
                "MXYZ" : [ -1.0, 0.0, 0.0 ]
            },
            {
                "MAT_ID" : 104,
                "COORD_ID" : 0,
                "MXYZ" : [ 0.0, -1.0, 0.0 ]
            }
        ]
    }
Text-format section
NO_ORDERS(17.7.3)#

NO_ORDERS

Fixed parameter set 1#
[row, col] = [1, 1]
Type=I

Number of harmonic orders.

NO_POLES#
NO_POLES(17.7.3)#
Text-format section
Fixed parameter set 1#
[row, col] = [1, 2]
Type:

Integer (I)

Description:

Number of magnetic poles (for one 360-degree revolution).

ANGLE#
ANGLE(17.7.3)#
Text-format section
Fixed parameter set 1#
[row, col] = [1, 3]
Type:

Real (E)

Unit:

deg

Description:

Reference angle.

ORDERS#
ORDERS(17.7.3)#
Text-format section
Fixed parameter set 2#
[row, col] = [2, 1]
Type:

Integer array (I)

Number:

NO_ORDERS = number of harmonic orders to consider

Description:

Harmonic order.

AMPLITUDE#
AMPLITUDE(17.7.3)#
Text-format section
Fixed parameter set 2#
[row, col] = [2, 2]
Type:

Real array (E)

Number:

NO_ORDERS = number of harmonic orders to consider

Description:

Normalized amplitude for each ORDERS value.

MAT_ID#
MAT_ID(17.7.3)#
Text-format section
Fixed parameter set 3#
[row, col] = [3, 1]
Type:

Integer (I)

Description:

Material ID of the elements to which the magnetization vector is assigned ( MAT_ID(16.1) ).

COORD_ID#
COORD_ID(17.7.3)#
Text-format section
Fixed parameter set 3#
[row, col] = [3, 2]
Type:

Integer (I)

Description:

Local coordinate system in which the magnetization vector is defined ( COORD_ID(12) ).

MXYZ#
MXYZ(17.7.3)#
Text-format section
Fixed parameter set 3#
[row, col] = [3, 3]
Type:

Real array (E)

Number:

3

Unit:

T

Description:

Magnetization-vector components in each direction of the local coordinate system.

Note

Definition: The input sinusoidal function is given by the following equation.

\[\mathbf{M}_{r} \left( \theta \right) = \mathbf{M}_{rs} \sum_{k=1,3,5,\dots}^{k_{\text{max}}} b_k \sin \left( \left(\frac{m}{2}\right) k \left( \theta - \theta_0\right)\right)\]

Here, \(\mathbf{M}_{rs}\) is ( MXYZ ), \(k\) is ORDERS, \(b_k\) is AMPLITUDE, and \(m\) is NO_POLES. Note that \(k_{\text{max}}\) is the maximum harmonic order and NO_ORDERS is the number of orders entered. \(\theta_0\) is the reference angle ANGLE in the cylindrical coordinate system and corresponds to the positions where the magnetization reverses (between magnetic poles). \(\theta\) is the angle of the element center in the cylindrical coordinate system.

The magnetization orientation can be specified as radial orientation (the radial direction in a cylindrical coordinate system) or parallel orientation (an arbitrary direction in a Cartesian coordinate system). The selected orientation corresponds to the coordinate system assigned by COORD_ID on line 3. Although the equation above contains only odd-order components, even-order components can also be entered. The example below shows data for the illustrated model with four magnetic poles, a reference angle of 45 degrees, and radial orientation up to harmonic order 5 (odd orders only). COORD_ID = 1 on line 2 is the ID of the local cylindrical coordinate system.

Example definition of a magnetization distribution

Example definition of a magnetization distribution#

SOURCES Definitions

Text-format section
Example input#
SOURCE
* MAGNET * SERIES_ID * TIME_ID * NO_MAT_ID * INPUT_TYPE *
MAGNET 1 1 4 2
* NO_ORDERS * NO_POLES * ANGLE(deg) *
3 4 45.
* ORDER * AMPLITUDE *
1 1.0
3 0.25
5 0.05
* MAT_ID * COORD_ID * MX(MR) * MY(MT) * MZ *
101 1 1.0 0.0 0.0
* MAT_ID * COORD_ID * MX(MR) * MY(MT) * MZ *
102 1 1.0 0.0 0.0
* MAT_ID * COORD_ID * MX(MR) * MY(MT) * MZ *
103 1 1.0 0.0 0.0
* MAT_ID * COORD_ID * MX(MR) * MY(MT) * MZ *
104 1 1.0 0.0 0.0
END
JSON format from 2024.11#
    "MAGNET" :
    {
        "SERIES_ID" : 1,
        "TIME_ID" : 1,
        "INPUT_TYPE" : 2,
        "NO_ORDERS" : 3,
        "NO_POLES" : 4,
        "ANGLE" : 45.0,
        "ORDERS" : [ 1, 3, 5 ],
        "AMPLITUDES" : [ 1.0, 0.25, 0.05 ],
        "data" :
        [
            {
                "MAT_ID" : 101,
                "COORD_ID" : 1,
                "MXYZ" : [ 1.0, 0.0, 0.0 ]
            },
            {
                "MAT_ID" : 102,
                "COORD_ID" : 1,
                "MXYZ" : [ 1.0, 0.0, 0.0 ]
            },
            {
                "MAT_ID" : 103,
                "COORD_ID" : 1,
                "MXYZ" : [ -1.0, 0.0, 0.0 ]
            },
            {
                "MAT_ID" : 104,
                "COORD_ID" : 1,
                "MXYZ" : [ -1.0, 0.0, 0.0 ]
            }
        ]
    }

17.7.4 Equation input#

When INPUT_TYPE = 3, specify an equation for each material ID.

Text-format section
Type:

Fixed parameter set 2

Number of lines:

3 (equation format)

Number of parameters:

Text format#
* MXYZ(x,y,z) * xyz(m) *
M(x,y,z)=0;;
theta(x,y,z) = atan2(y,x);
M(x,y,z)=sin(2*(theta(x,y,z)-(PI/4)));;
M(x,y,z)=0;;
*  MAT_ID * COORD_ID *
102      0
* MAGNET * SERIES_ID * TIME_ID * NO_MAT_ID * INPUT_TYPE *
MAGNET           1             1           1       3
* MXYZ(x,y,z) * xyz(m) *
theta(x,y,z) = atan2(y,x);
M(x,y,z)=-sin(2*(theta(x,y,z)-(PI/4)));;
M(x,y,z)=0;;
M(x,y,z)=0;;
*  MAT_ID * COORD_ID *
103      0
* MAGNET * SERIES_ID * TIME_ID * NO_MAT_ID * INPUT_TYPE *
MAGNET           1             1           1       3
* MXYZ(x,y,z) * xyz(m) *
M(x,y,z)=0;;
theta(x,y,z) = atan2(y,x);
M(x,y,z)=-sin(2*(theta(x,y,z)-(PI/4)));;
M(x,y,z)=0;;
*  MAT_ID * COORD_ID *
104      0
END
JSON format from 2024.11#
    {
        "MAGNET" :
        {
        "SERIES_ID" : 1,
        "TIME_ID" : 1,
        "INPUT_TYPE" : 3,
        "FUNCTION_MX" : "M(x,y,z)=0;;",
        "FUNCTION_MY" : "theta(x,y,z) = atan2(y,x);M(x,y,z)=sin(2*(theta(x,y,z)-(PI/4)));;",
        "FUNCTION_MZ" : "M(x,y,z)=0;;",
        "data" :
        [
            {
            "MAT_ID" : 102,
            "COORD_ID" : 0
            }
        ]
        }
    },
    {
        "MAGNET" :
        {
        "SERIES_ID" : 1,
        "TIME_ID" : 1,
        "INPUT_TYPE" : 3,
        "FUNCTION_MX" : "theta(x,y,z) = atan2(y,x);M(x,y,z)=-sin(2*(theta(x,y,z)-(PI/4)));;",
        "FUNCTION_MY" : "M(x,y,z)=0;;",
        "FUNCTION_MZ" : "M(x,y,z)=0;;",
        "data" :
        [
            {
            "MAT_ID" : 103,
            "COORD_ID" : 0
            }
        ]
        }
    },
    {
        "MAGNET" :
        {
        "SERIES_ID" : 1,
        "TIME_ID" : 1,
        "INPUT_TYPE" : 3,
        "FUNCTION_MX" : "M(x,y,z)=0;;",
        "FUNCTION_MY" : "theta(x,y,z) = atan2(y,x);M(x,y,z)=-sin(2*(theta(x,y,z)-(PI/4)));;",
        "FUNCTION_MZ" : "M(x,y,z)=0;;",
        "data" :
        [
            {
            "MAT_ID" : 104,
            "COORD_ID" : 0
            }
        ]
        }
    }
FUNCTION_MX, FUNCTION_MY, FUNCTION_MZ#
FUNCTION_MX(17.7.4)#
FUNCTION_MY(17.7.4)#
FUNCTION_MZ(17.7.4)#

Enter the components MX(x,y,z), MY(x,y,z), and MZ(x,y,z) of the magnetization distribution function M(Mx,My,Mz) as equations ( Appendix I ).

MAT_ID#
MAT_ID(17.7.4)#
Text-format section
Fixed parameter set 1#
[row, col] = [2, 1]
Type:

Integer (I)

Description:

Material ID of the elements to which the magnetization vector is assigned ( MAT_ID(16.1) ).

COORD_ID#
COORD_ID(17.7.4)#
Text-format section
Fixed parameter set 1#
[row, col] = [2, 2]
Type:

Integer (I)

Description:

Local coordinate system in which the magnetization vector is defined ( COORD_ID(12) ).

Note

The example described by the sinusoidal-input equation in 17.7.3 is equivalent to the following input.

Text-format section
Example input#
*SOURCES Definitions*
SOURCE
* MAGNET * SERIES_ID * TIME_ID * NO_MAT_ID * INPUT_TYPE *
MAGNET 1 1 4 3
* FUNCTION MX(x,y,z) * x(m) or x(m) *
MX(x,y,z)=sin(2*(y-(PI/4)))+0.25*sin(6*(y-(PI/4)))+0.05*sin(10*(y-(PI/4)));;
* FUNCTION MY(x,y,z) * y(m) or y(rad) *
MY(x,y,z)=0;;
* FUNCTION MZ(x,y,z) * z(m) or z(m) *
MZ(x,y,z)=0;;
* MAT_ID * COORD_ID *
101 1
* MAT_ID * COORD_ID *
102 1
* MAT_ID * COORD_ID *
103 1
* MAT_ID * COORD_ID *
104 1
END
JSON format from 2024.11#
    {
        "MAGNET" :
        {
            "SERIES_ID" : 1,
            "TIME_ID" : 1,
            "INPUT_TYPE" : 3,
            "FUNCTION_MX" : "MX(x,y,z)=sin(2*(y-(PI/4)))+0.25*sin(6*(y-(PI/4)))+0.05*sin(10*(y-(PI/4)));;",
            "FUNCTION_MY" : "MY(x,y,z)=0;;",
            "FUNCTION_MZ" : "MZ(x,y,z)=0;;",
            "data" :
            [
                {
                    "MAT_ID" : 101,
                    "COORD_ID" : 1
                },
                {
                    "MAT_ID" : 102,
                    "COORD_ID" : 1
                },
                {
                    "MAT_ID" : 103,
                    "COORD_ID" : 1
                },
                {
                    "MAT_ID" : 104,
                    "COORD_ID" : 1
                }
            ]
        }
    }

When INPUT_TYPE = 4, specify nonlinear analysis using a permanent-magnet demagnetization curve for each material ID.

Text-format section
Type:

Fixed parameter set 1

Number of lines:

2

Number of parameters:

3, 4

Text format#
* MAT_ID * TYPE * BH_MAGNET_CURVE_ID * MU *
    I        I            I            E
* COORD_ID *  MX or MR  *   MY or MT  *    MZ   *
    I              E          E              E
JSON format from 2024.11#
        "data" :
        [
            {
                "MAT_ID" : I,
                "TYPE" : I,
                "BH_MAGNET_CURVE_ID" : I,
                "MU" : E,
                "INPUT_TYPE" : I,
                "COORD_ID" : I,
                "MXYZ" : [ E, E, E ]
            }
        ]
MAT_ID#
MAT_ID(17.7.5)#
Text-format section
Fixed parameter set 1#
[row, col] = [1, 1]
Type:

Integer (I)

Description:

Material ID of the elements to which the magnetization vector is assigned ( MAT_ID(16.1) ).

TYPE#
TYPE(17.7.5)#
Text-format section
Fixed parameter set 1#
[row, col] = [1, 2]
Demagnetization-analysis type#

Value

Description

0

Performs nonlinear analysis using a permanent-magnet demagnetization curve.

1

Performs demagnetization analysis using a permanent-magnet demagnetization curve.
BH_MAGNET_CURVE_ID#
BH_MAGNET_CURVE_ID(17.7.5)#
Text-format section
Fixed parameter set 1#
[row, col] = [1, 3]
Type:

Integer (I)

Description:

ID of the demagnetization curve. Define the curve with 20_4_Magnet_Demagnetization_Curve(20).

Nonlinear analysis ( NON_LINEAR(2) = 1) is required.

MU#
MU(17.7.5)#
Text-format section
Fixed parameter set 1#
[row, col] = [1, 4]
Type:

Real (E)

Description:

Specifies the relative permeability in the hard-magnetization direction.

COORD_ID#
COORD_ID(17.7.5)#
Text-format section
Fixed parameter set 2#
[row, col] = [2, 1]
Type:

Integer (I)

Description:

Local coordinate system in which the magnetization vector is defined ( COORD_ID(12) ).

MXYZ#
MXYZ(17.7.5)#
Text-format section
Fixed parameter set 2#
[row, col] = [2, 2]
Type=E
Type:

Real array (E)

Number:

3

Unit:

T

Description:

Magnetization-vector components in each direction of the local coordinate system.

Set TIME_ID(17.7) to 1 (constant). The last data point in 20_4_Magnet_Demagnetization_Curve(20) is used as the magnetization.

Note

  • When TYPE = 1, nonlinear analysis follows the demagnetization curve, so demagnetization is not performed.

  • When TYPE = 2, the operating point moves down along the demagnetization curve and uses the recoil permeability when it moves back up. The history is

saved in the demagnetization_solution file and used in a restart calculation after being renamed to old_demagnetization_solution.

To analyze the temperature dependence of a demagnetization curve, use a restart calculation and replace 20_4_Magnet_Demagnetization_Curve(20) with data for the temperature to be analyzed.

Hint

Set the magnetization direction of the magnet to one of the X, Y, or Z directions. For example, if a permanent magnet is located at 45 degrees from the X axis, define a local coordinate system in which the 45-degree direction is the X or Y direction, and assign its ID to COORD_ID(17.7.5) to set the magnetization direction.

  • Using this feature requires the <PM Demagnetization module>.