Magnetic-Stress Analysis Tab

Setting Item

Notes

Magnetic Analysis Type

Static analysis

The constant load, voltage or current is applied.

Harmonic analysis

The sinusoidal load, voltage or current is applied.

Transient Analysis

Transient states are analyzed.

(Note) The magnetic transient analysis is available in an optional package.

Stress Analysis Type

Static analysis

A certain constant load is applied.

Harmonic analysis

The sinusoidal load is applied.

Transient Analysis

Transient states are analyzed.

The stress-transient analysis is available in an optional package.

Analysis Options

Notes

Calculate Torque

Calculates the torque of the electromagnetic force.

Available for the 2D or 3D static analysis.

Calculate Inductance

Calculates the self-inductance, mutual inductance, and impedance(in the harmonic analysis only).

• See [Inductance Calculation] for details.

• In the static analysis, the setting is fixed with [Calculate Inductance].

• The calculation will take some time. It is recommended to unselect this option unless it is necessary.
  

Calculation Type

Select a calculation type of inductance from the following.

Apparent Inductance

Differential Inductance

Selection is required if the analysis type is static as well as nonlinear.

For other analysis types, the setting is irrelevant. The results will be the same whichever is opted.

See [Calculation Type of Inductance] for details.

Analysis Options

Notes

External Circuit Coupling

Executes a coupled analysis with the external circuit.

Click and launch Circuit Editor to edit external circuit.

Rotating Machinery

Analyzes rotating machinery such as motor and generator.

Refer to [Rotating machinery tab] for detailed setting.

Calculate the Inductance

Calculates the self-inductance and mutual inductance.

• The calculation will take some time. It is recommended to deselect this option unless it is necessary.

• Calculation type of inductance is not selectable for the transient analysis.
  See [Calculation Type of Inductance] for details.

Partial Model (Symmetric Model) Setting

Sets the partial model (symmetric model).

Setting items are as follows.

• Conversion of the results (Values such as torque which are shown in the table of results)

• Adjustment of the relation between the analysis domain and the external circuit in the external circuit coupling

• Adjustment of the ratio of the analysis domain (symmetric model) and the full model in the motion equation coupling.

Partial Model (Symmetric Model)

Selected if the analysis domain is partial model (symmetric model) such as period symmetric.

Number of Divisions (Full model/Partial model)

Sets the number of divisions of the full model. If the the model is quarter symmetric, enter 4.

Conversion of I/O values of External Circuit
[Convert] sets the value of the full model for the external circuit. [Do not convert] uses the value of the partial model.

  If [Convert] and [Convert results to full model for output] are selected, the values related to the external circuit will be converted to the full model for output. Converted values are such as current of components of the circuit, which are displayed on the results table.         If [Convert] is selected, enter the number in[Number of series] and [Number of parallels] for coils on the external circuit.

  See [Example of External Circuit Conversion Setup] for the details.

  See also [External Circuit Conversion].

Convert Results to Full Model for Output

Converts the results (values such as torque which are shown in the result table) to the full model for output.

In the case of 2D quarter symmetric model for example, the torque value is obtained by [torque value of the quarter model x model thickness x number of divisions of the full model].

Fundamental Frequency (for determining one period and iron loss calculation)

Used to determine one period of the electric angle and calculate the iron loss.

Available only for the transient analysis.

• One period of the electric angle is used for calculating average torque, loss, and efficiency.
  One period of electrical angle is calculated as 1/fundamental frequency.

• See [Iron Loss tab] for the iron loss calculation.
  

Frequency of Power

Automatically referred to.

Not available for the DC power.

It is determined by the setting on the [Current] tab in the body attribute.

Specify Frequency

The fundamental frequency is specified manually.

Calculate from the number of poles and rotations

The number of poles and rotations of the rotating machinery are used for calculation.

Enter the number of poles.

The number of rotations on the [Rotating Machinery] tab is referred to.

Analysis Options

Notes

Acceleration

Takes the weight of the model into account.

 Not selectable in the resonant analysis.

Angular velocity

Takes the centrifugal force into account.

Available for the axisymmetric or 3D static analysis.

Yes, it is possible. The rotation axis is fixed to Z.

Thermal Load

Takes the thermal load into account.

If selected, the thermal load can be set on the Step/ thermal load tab.

Constrain the Freedom of Shells

Available for the 3D analysis. If selected, the freedom of displacement in the rotational direction can be constrained on the mechanical tab.

If selected, the freedom of displacement in the rotational direction is constrained on the mechanical tab.

2D Approximation

To perform the 2D analysis, select either one below.

Plane Strain

If the object is fixed in the Y direction,

there will be no displacement in the Y direction.

The X/Z components of the strain are only taken into account.

This is called the planar strain approximation.

Plane Stress

If the object's Y dimension is considerably smaller than the X/Z dimensions

and the object can deform freely in the Y direction,

it can be assumed that the stress has X/Z components only.

This is called the plane stress approximation.

Large Deformation

Analyzes the geometric nonlinearity involving large deformation.

Large deformation involves rotation and large strain of the elements.

For the details, see Analysis of Large Deformation (Geometric Nonlinearity) in the Technical Note.

- Select "Large displacement"

to have rotation involved.

The total Lagrangian formulation with Green-Lagrangian strains is used.

- Select both "Large displacement" and "Large strain"

to have rotation and large strain involved.

The updated Lagrangian formulation with logarithmic strain is used.

It is recommended to select "Large displacement" when you are selecting "Large strain".

- Select "Large strain"

to have large strain involved.

The updated Lagrangian formulation with logarithmic strain is used.

Executes iterative calculations that may take long time.

Available for the static analysis only.

Reference type of electromagnetic force of the magnetic transient analysis results

In the transient analysis, select a type from the following.

Value at the final step

The electromagnetic force in the final timestep of the magnetic analysis is referred to as the load in the stress analysis. The load is constant over the time.

Value at each step

Selectable for the stress-transient analysis.

The electromagnetic force in each timestep of the magnetic analysis is referred to as the load in each timestep of the stress analysis.