ProductsFEA Software for Electromechanical DesignJMAG-Designer [Magnetic Field Analysis]

High-Speed Magnet Eddy Current Calculation

Examining the eddy currents that occur in the magnets of motors has required a significant amount of time because analyses using a three-dimensional model has been required. The high-speed magnet loss calculation of rotation machines provides the fastest possible analysis.
Conventional methods to calculate the eddy current loss of magnets that require 8 hours can now be run in approximately 12 minutes.

High-Speed Magnet Eddy Current Calculation
Eddy current loss by each number of magnet divisions

JMAG Function Videos


Magnet eddy current analysis

Analysis Accounting for Permeability Distribution

The magnetic flux density distribution and flux lines that isolate the factors making up the phenomena can be evaluated by fixing the magnetic properties of materials in a specific state using the frozen permeability condition to analyze a model.

Isolated Torque

Isolate the Current Phase Angle Characteristics of Torque Isolate the Magnetic Flux Density Distribution
Isolate the Current Phase Angle
Characteristics of Torque
Isolate the Magnetic Flux Density Distribution

JMAG Function Videos


Torque Segregation Analysis of a Motor

Demagnetization Calculation Updated

Analysis is performed on how demagnetization due to reverse magnetic field and thermal demagnetization affect motor properties. Evaluate in detail phenomena such as local demagnetization caused by reverse magnetic fields and the differences in demagnetization resistance in the ends of a coercive force distribution magnet.
The magnetic flux density for magnets prior to demagnetization can be set as the standard to track the changes of magnetic flux density distribution as demagnetization ratio. By performing this analysis in combination with permanence coefficient distribution, magnets can be analyzed in great detail.

Demagnetization Calculation
Demagnetizing ratio distribution in PM motors

JMAG Function Videos


Demagnetization Analysis of a Motor Magnet
Updated

Time Periodic Explicit Error Correction

The time period explicit error correction method uses the temporal periodicity of the varying field in the magnetic field analysis. It shortens the transient period that occurs in a transient analysis, and forces the model into steady state operation in fewer time steps than if the model were allowed to achieve steady state operation on its own. This function is effective for models with an electric potential (voltage) source for circuits. It is also effective for models that require substantial analysis time (analysis steps) before reaching steady state. JMAG's unique technology has been built into this function, so it can be applied to almost all problems with time varying fields.
As an example, an induction motor analysis could require up to 10 time periods before transitioning to steady state operation. If the goal is to observe steady state operation, then these 10 periods are not necessary. In this case, adopting the time period control method would facilitate a reduction in analysis by reducing the transient period.
It is possible to reduce analysis time even further by combining the time period method with the traditional approximate steady state method.

 A comparison of steady torque convergence when applying and not applying the time period explicit error correction method in induction motor analysis.
A comparison of steady torque convergence when applying and not applying the time period explicit error correction method in induction motor analysis.


A second example of the time period method involves the analysis of a transformer for a switching power supply. In this case the capacitance of the secondary smoothing capacitor determines the system?fs time constant. This could lead to an extremely large time constant and thus a long analysis time before reaching steady state operation. By using the time period explicit error correction method, it is possible to considerably shorten the analysis time.

Time period explicit error correction method in analysis of a transformer for switching power supply A comparison of convergence for steady current when applying and not applying the method.
Time period explicit error correction method in analysis of a transformer for switching power supply A comparison of convergence for steady current when applying and not applying the method.

JMAG Function Videos


Steady state properties analysis
by time periodic explicit
error correction

Eddy Current Loss in Laminated Steel

  • Eddy current loss in laminated steel calculated with easy settings!
    • No need for separate mesh generation for each lamination
    • Lamination taken into account even in 2D modeling
Image of eddy current distribution in laminated steel Image of eddy current distribution in laminated steel Image of eddy current distribution in laminated steel
Image of eddy current distribution in laminated steel

JMAG Function Videos


Analysis of eddy current in a laminated steel sheet

Harmonic Current Input

  • Easy confirmation of harmonic component contributions!
    • Confirm contribution to results by setting values for each harmonic order

Difference in iron loss distribution (left: fundamental wave; right: including harmonics)
Difference in iron loss distribution (left: fundamental wave; right: including harmonics)

JMAG Function Videos


Analysis of applied harmonic
current

Insulation

  • Insulation condition also supported in 2D analysis
    • Confirm reductions in eddy current loss by in-plane magnet divisions
    • No need for modeling insulators at division boundaries
    • Set by conductor divisions or by insulating region edges

Insulation
Eddy current loss distribution inside magnets

Responding to voluntary motion

Supports voluntary motions like axis precession (shaking as though drawing a circle centering on the axis) or spherical motors.

  • Supports hexaxial motion enabling 3D motion
  • Generate mesh using the FEM+BEM function in 2D analyses
  • Generate mesh using the Patch Mesh function in 3D analyses

* These functions are used in User Subroutine usrfm3.

Responding to voluntary motion Responding to voluntary motion

Motor characteristics analysis taking 3D movement into consideration


JMAG Function Videos


No-load analysis for a motor

Load analysis for a motor

Solenoid valve thrust force analysis

Transformer inductance analysis

Current Hysteresis Band Control

Newly created a hysteresis band control element to specify upper and lower current value limits.
Enables SRM or relay current controlled analyses without having to use another circuit simulator.

Current Hysteresis Band Control Current Hysteresis Band Control
Current Hysteresis Band Control

JMAG Function Videos


Current hysteresis band
control analysis

Zooming Analysis

Capturing phenomena occurring in detail requires a detailed analysis of the entire model. This causes the size of the model to become extremely large, and sometimes calculations cannot be solved in a practical amount of time.
A zooming analysis is new analysis technology that starts with the entire model and gradually zooms to the area desired to be viewed, allowing detailed electromagnetic phenomena analysis inside the model.

Example of a zooming analysis for a litz wire model
Example of a zooming analysis for a litz wire model
Analyze the current distribution of a wire using the results of "A Master model"
as the boundary condition of "B Sub-model"

JMAG Function Videos


Zooming Analysis

Analysis Accounting for Hysteresis Properties

  • Accounting for Hysteresis phenomena in transient response analysis
    • Using minor loops of magnetic properties during magnetic field analysis allows for loss evaluations accounting for energy balance
リングコア リングコアの交番磁界
Example of a 2D transient analysis of a ring core
The alternating magnetic field of the ring core creates a symmetric loop by
using magnetic properties that account for minor loops.

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