月曜日 09:00 - 12:00 13:00 - 17:00 火曜日 09:00 - 12:00 13:00 - 17:00 水曜日 09:00 - 12:00 13:00 - 17:00 木曜日 09:00 - 12:00 13:00 - 17:00 金曜日 09:00 - 12:00 13:00 - 17:00

JMAG-Int.

Name: JMAG-Int.
Address: KUDAN-KAIKAN Terrace 11th Floor, 1-6-5, Chiyoda-ku, Tokyo, 102-0074, JP
Telephone: +81362617361

JMAG is a comprehensive software suite for electromechanical equipment design and development.

JMAG is a simulation software for electromechanical design and development. Many companies and universities have supported and used JMAG since 1983. JMAG can accurately capture and quickly evaluate complex physical phenomena inside of machines. Users inexperience and experienced in simulation analysis can easily perform the simple operations required to obtain precise results.

04/06/2026

[Application Catalog] Induction motors are widely used for industrial products and appliances to take advantage of benefits from the simple structure and affordability to maintainability. The rotating magnetic field of the stator winding induces a current in the secondary conductor. That current and the rotating magnetic field produce force in the rotation direction that turns the induction motor. However, the induced current generates a large amount of heat due to Joule losses in the rotor.
A coupled analysis is advantageous to precisely evaluate the temperature rise caused by the Joule losses of the secondary conductor and iron losses in the coil of the induction motor. This type of simulation obtains the temperature using thermal analyses that reference the losses obtained by magnetic field analyses. These simulations can evaluate the effect changes to the number of duct vents and layout have on the cooling through simple modifications of the parameters.
This case study optimizes the vent duct layout of an induction motor by taking into account the ventilation cooling to minimize the core volume and airflow from the cooling fan while satisfying the torque and temperature limits.

https://www.jmag-international.com/catalog/318_im-ductoptimization/

01/06/2026

Column: [No. 94] The Axial-flux Machine and Faraday's Law
Sometimes I get a request to have a look at a disused electric machine in an old factory or even in a barn. Often the question is 'does it work?', or 'can we make it run on single-phase AC?', or 'is it worth anything?' I've seen a few induction motors and one Schräge motor and an inductor alternator, all of them long since scrapped. But the one in the photo was easy to find in the WEG Museum at Jaragua do Sul in southern Brazil, many years ago, and it's a jewel for one reason in particular: it provides a perfect graphic demonstration of Faraday's law. Imagine my delight when I came across it, in the company of a group of friends and colleagues from Jaragua do Sul.

We need to look for magnets rotating past coils of wire. Faraday tells us that the rotation induces voltage at the terminals: that's the basis of the electric generator.

Read more:https://www.jmag-international.com/engineers_diary/094/

28/05/2026

[White Papers] Chopper circuits and other power conversion systems are operating at higher frequencies due to the recent prevalence of wide-bandgap semiconductors, such as SiC and GaN. Higher frequencies are essential to miniaturize systems and increase efficiency. However, skin and proximity effects as well as the parasitic components of stray capacitance between the windings make the impedance characteristics more complex and increase the losses and EMI noise. Accurate prediction of the impedance characteristics that accounts for the high-frequency phenomenon during the machine design and optimization phase is critical.
This paper describes an approach for modeling a wide-band impedance analysis using an electromagnetic finite element analysis that takes into account displacement currents (Full-Wave FEA). We also compare the impedance characteristics of the chopper inductor obtained using this analysis against measured results to illustrate the fidelity and reasons for that accuracy.

https://www.jmag-international.com/whitepapers/w-mo-212/

26/05/2026

Webinar: "Brush up on Motor Design!" has been released.
[Vol.73] Inverter-fed machines
The 73rd seminar serves as the final session of the five-seminar series on synchronous machine analysis (Vol. 69–73). Focusing on “inverter-fed machines,” which are indispensable in modern design practice, it outlines a practical approach to analysis aligned with real-world operation, moving beyond classical analysis based on commercial power-driven systems. The seminar covers topics such as changes in the voltage waveform due to PWM control and the concept of space vectors.
In particular, it is crucial to examine how magnetic saturation and mutual saturation affect various parameters by combining finite element analysis (FEM) with phasor diagrams in order to ensure consistency with actual device behavior. This process offers perspectives directly relevant to design and analysis, including the use of Ld and Lq as well as the maximization of torque under inverter voltage constraints.
This seminar offers essential insights into how the theory covered throughout the series can be applied to real-world drive systems.

https://www.jmag-international.com/seminar/prof_miller_seminar/

21/05/2026

[JMAG Users Conference Proceedings] NICHIA CORPORATION
Plastic-bonded magnets offer greater design flexibility and orientation freedom, although their magnetic characteristics are lower than those of sintered magnets. When an external magnetic field is applied during the molding process, bonded magnets can be aligned in a specific direction (magnetic alignment), achieving motor performance comparable to that of sintered magnets.
However, outline designs using the JMAG material database present challenges because the simulation results often diverge from actual measurements due to incomplete magnetization, which is commonly observed in anisotropic designs. Therefore, we have developed a magnetization analysis method that accounts for the alignment process - the primary factor contributing to the divergence between simulated and measured results. This case study introduces an example of an IPM motor design intended for an automotive auxiliary motor application.

You can read the full paper here:https://www.jmag-international.com/conference_doc/uc2025_04/

19/05/2026

[アプリケーションカタログ] 鋼の表面硬化を目的とした焼入れの手法の一つとして、高周波焼入れが多くの機械部品に適用されています。
一般に高周波焼入れ装置の試作や試験には、大きな費用と時間を要し、さらに危険を伴う場合もあります。また、誘導加熱という複雑な現象に加え、キュリー点を超える加熱により材料特性も大きく変化するため加熱状態の推測は困難です。そのため、詳細な現象を扱うことができる有限要素法に基づいたシミュレーションが有用です。
また、焼入れを行う際は均一な加熱が期待されますが、加熱コイルの形状・配置、電流周波数や大きさの調整など検討すべき要素は少なくありません。多くの設計変数や評価項目がある場合には、最適化機能を用いた自動計算をシミュレーションに適用すると、工数を大きく削減できます。
ここでは、歯車の高周波焼入れに使用するコイルの設計に最適化機能を用いて実施した例を示します。
#誘導加熱 #最適化 #温度 #温度分布 #歯車 #高周波焼入れ #渦電流 #表皮効果 #相関行列

https://www.jmag-international.com/jp/catalog/233_ih_optimization/

13/05/2026

[White Papers] Modern inverters for motor drives are utilizing SiC and other wide-bandgap semiconductors to realize faster switching speeds as electric vehicles become more commonplace and requirements for energy-efficient devices become stricter. Faster switching speeds do contribute to higher efficiency but also increase common mode-voltage and the risk of bearing current due to the dielectric breakdown in the bearings. The bearing current can also cause electrical corrosion in the bearings, which can significantly reduce motor reliability. Evaluations that can precisely predict the common-mode voltage, bearing current, and other high-frequency phenomenon at the design stage is vital to devise EMI countermeasures and ensure reliability.
This case study simulates high-frequency pathways accounting for parasitic components of each part via an equivalent circuit and evaluates the high-frequency phenomenon of a permanent magnet synchronous motor using a direct coupled finite element analysis (FEA). We provide some guidelines for modeling equivalent circuits and touch on the accuracy obtained through these approaches.

https://www.jmag-international.com/whitepapers/w-mo-213/

11/05/2026

Column: [No. 93] Equivalent circuits and the finite-element method
We are sometimes told that there are two theories of electric machines: the field theory and the circuit theory. If we look through almost any traditional textbook on electric machine theory and design, we will see circuit diagrams and equations for calculating equivalent-circuit parameters and performance characteristics; but very little evidence of serious field analysis (particularly using numerical methods). Conversely if we look through many textbooks on finite-element analysis we will see plenty of sophisticated solutions to Maxwell’s equations; but very little of the classical theory of design and performance. It is only in recent years that we have seen attempts to publish a comprehensive treatment of both divisions of the subject in the same volume. There is even a third division, control engineering, which is a substantial subject in its own right; and textbooks in this division tend to have very little treatment of either the field theory or the circuit theory of electric machines. These observations merely reflect the specialization that we see in modern technology. The various divisions of a subject apparently so focussed as electric machines are so vast that a single author could hardly be expected to encompass them all. Similar cases have been treated in the past in books with multiple authors, but it is difficult to produce a unified treatment.

Read more:https://www.jmag-international.com/engineers_diary/093/

07/05/2026

[White Papers] JMAG-RT generates models that can simulate nonlinear motor characteristics for use in control circuit designs done with software-in-the-loop (SIL), hardware-in-the-loop (HIL), and other such testing methods. JMAG-RT provides a wide variety of these motor models, but the PMSM motor model is currently the most widely used. In particular, two types of precision spatial harmonic motor models can take into account the spatial harmonics produced by the geometric properties of the stator, slot openings, and other motor components. This white paper compares the analysis accuracy of these two spatial harmonic motor models via numerical tests. The simulations and measurements evaluate a motor with a three-phase star connection driven by a standard sinusoidal drive, a sinusoidal drive with the W-phase disconnected, and a PWM drive.

[W-MB-181] Validation of JMAG-RT Spatial Harmonic Model Accuracy: Comparison of Differential Equation Models, Integral Method Models, and FEA
https://www.jmag-international.com/whitepapers/w-mb-181/

30/04/2026

[Application Catalog] Many motor designs aim to adjust specifications without modifying the stator and rotor core geometries for use in new applications to avoid significant upfront costs due to new molding dies, changes to the production line, or longer development periods.
However, optimizations require a vast number of design variables in order to cover all of the potential adjustments, which would take significant time to explore the full range of options using FEA.
This case study proposes a design exploration approach that generates a surrogate model before the optimization to overcome the challenges presented by optimizations using only FEA. Offline optimizations that reference a surrogate model can estimate characteristics without continuously running FEA.
This document introduces a process for an offline optimization run using a surrogate model to explore design solutions that satisfy the requirements in less time while also reducing the computational costs.

[JAC319] Design Exploration of an IPM Motor Using an Offline Optimization
https://www.jmag-international.com/catalog/319_ipm-optsurrogatemodeloffline/

住所

KUDAN-KAIKAN Terrace 11th Floor, 1-6-5
Chiyoda-ku, Tokyo
102-0074

営業時間

月曜日	09:00 - 12:00
	13:00 - 17:00
火曜日	09:00 - 12:00
	13:00 - 17:00
水曜日	09:00 - 12:00
	13:00 - 17:00
木曜日	09:00 - 12:00
	13:00 - 17:00
金曜日	09:00 - 12:00
	13:00 - 17:00

電話番号

+81362617361

ウェブサイト

https://www.jmag-international.com/

アラート

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