ProductsFEA Software for Electromechanical DesignJMAGDesigner [Magnetic Field Analysis]

HighSpeed 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 threedimensional model has been required. The highspeed 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.
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 
JMAG Function Videos
Torque Segregation Analysis of a Motor 

Demagnetization Calculation
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.
Demagnetizing ratio distribution in PM motors
JMAG Function Videos
Demagnetization Analysis of a Motor Magnet 

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 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.
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 
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)
JMAG Function Videos
Analysis of applied harmonic current 

Insulation
 Insulation condition also supported in 2D analysis
 Confirm reductions in eddy current loss by inplane magnet divisions
 No need for modeling insulators at division boundaries
 Set by conductor divisions or by insulating region edges
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.
Motor characteristics analysis taking 3D movement into consideration
JMAG Function Videos
Noload 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.
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
Analyze the current distribution of a wire using the results of "A Master model" as the boundary condition of "B Submodel"
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


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.


