JMAG White Papers

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  1. [W-MO-12] Comparative Evaluation of Synchronous Impedance of a 2D Model and a 3D Model

    Overview1.IntroductionFor synchronous motors, 2D simulations have been widely used because of the large computational costs, although impedance varies during operation due to its non-linear properties.However, a synchronous motor has strong three-di…

    7 Mar 2018

  2. [W-MO-13] Evaluation of a 2D Brush Motor Analysis Accounting for 3D Geometry

    Overview1.IntroductionAs brush motors are cost efficient and do not require control circuits, these familiar DC motors are used in a wide range of applications, from toys to industrial products.Though brush motors have a relatively simple operating …

    7 Mar 2018

  3. [W-TR-15] Loss Evaluation of a Transformer Shield Based on the Homogenization Method

    Overview1. IntroductionFor power transformers, stray loss generated in the surrounding structures due to leakage flux originating from windings is a common issue. Because people may make direct physical contact with the tank, measures have been tak…

    7 Mar 2018

  4. [W-MO-17] Alternator Analysis Using Tetrahedral/Pentahedral Mixed Mesh

    Overview1.IntroductionClaw pole alternators are used commonly as alternators for automobiles – due to the unique 3D structure and complicated flow of magnetic flux, the 3D electromagnetic field simulation with the finite element method (FEM) is effe…

    7 Mar 2018

  5. [W-MA-21] Iron Loss Analysis of an SR Motor Accounting for Hysteresis and Eddy Current Distribution

    Overview1. IntroductionSwitched reluctance motors (hereafter referred to as an "SR motor") are highly durable, robust, and have low costs since they do not use permanent magnets. Since the magnetic flux density waveform of an SR motor’s iron core di…

    7 Mar 2018

  6. [W-MO-23] Measurement of PM Motor Vibration/Noise and Analysis Modeling

    Overview1. IntroductionWhile miniaturization and efficiency optimization are always in demand in motor development, demand is also increasing for the reduction of vibration and noise in recent years. As a tool to solve these problems in development,…

    7 Mar 2018

  7. [W-MO-24] Copper Loss Analysis of a Rotating Machine Using the Zooming Method

    Overview1. Copper Loss Analysis of a Rotating MachineThere is an electromagnetic field analysis using the finite element method (FEM) as an effective analysis method for copper loss accounted for eddy currents in the winding of a rotating machine. A…

    7 Mar 2018

  8. [W-MA-46] Calculation Method of Eddy Current Loss of Electromagnetic Steel Sheet Using a 1D Finite Element Method

    Overview1. Background and subjectAs electromagnetic devices become more and more efficient, the precision in iron loss analysis becomes more important for electromagnetic field analysis. Synchronous motors using rare earth permanent magnets are espe…

    7 Mar 2018

  9. [W-MA-47] Toward Practical Application of Iron Loss Analysis Taking Stress into Account

    Overview1. Environments That Take Stress into AccountIncreasing the accuracy of an iron loss analysis for a magnetic field analysis poses challenges. With conventional iron loss calculation methods, the iron loss characteristics of electromagnetic s…

    7 Mar 2018

  10. [W-MA-48] Analyses of Higher Harmonics Copper Loss and Improvements Through Design Changes

    Overview1. BackgroundIncreasing the accuracy of a loss analysis for a magnetic field analysis becomes an important issue. Various factors cause losses to diverge from their theoretical state, and they typically tend to be treated as stray load loss.…

    7 Mar 2018

  11. [W-MA-49] Necessity and Approach of Stray Load Loss Analysis

    Overview1. BackgroundThe main components of loss depend on the operating point. One of these components is stray load loss. The stray load loss as a physical phenomenon is caused by eddy currents generated in the parts inside equipment, but unlike i…

    7 Mar 2018

  12. [W-MA-50] Effectiveness and Limits of 2D Analysis from Loss Analysis

    Overview1.IntroductionIn electromagnetic field analysis, 2D analysis (FEM) that include iron loss evaluations are widely used as a way to find a balance between finely detailed analysis and convenient analysis. Along with improving the efficiency of…

    7 Mar 2018

  13. [W-MA-51] Understanding Electromagnetic Phenomena in Steel Sheets Through Simulation

    Overview1. IntroductionDiscussions so far have focused on the degree to which agreement was found with respect to total loss on actual measurements and analysis in iron loss evaluations. However, as the importance of loss evaluation technology gains…

    7 Mar 2018

  14. [W-MB-52] Method for Determining the Optimum Resolution of JMAG-RT Model

    Overview1. BackgroundIn recent years, with the shortening of the development cycle, model-based development (MBD) has become more important than before. Among them, JMAG-RT provides a plant model to be used for functional requirements and functional…

    7 Mar 2018

  15. [W-SE-53] Transition to Steady State in a Short Time

    Overview1.BackgroundThere is a strong demand in the market for reducing calculation time in electromagnetic field analysis. One of the reasons is that, it is necessary to calculate time steps of many cycles because a model with a long time constant …

    7 Mar 2018

  16. [W-MO-85] Evaluating Efficiency Map considering the Effect of the Inverter

    Overview1. BackgroundAlong with high efficiency of electromagnetic equipment, highly accurate loss analysis is an important subject in electromagnetic field analysis. Permanent magnet synchronous motors and induction motors are often driven by inver…

    7 Mar 2018

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