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.

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/

27/04/2026

Webinar: "Brush up on Motor Design!" has been released.
[Vol.72] Operating characteristics
The 72nd seminar takes a deeper look at the operating characteristics of synchronous machines, systematically explaining the output-load angle characteristics, V-curves, and MVA charts (power capability curves) that define the operating limits.
Drawing on classical phasor‑diagram‑based analysis, the video also discusses the use of the finite element method (FEM) to account for nonlinear magnetic saturation. It further covers a range of theories indispensable for practical operation, including the effects of saliency, steady-state stability concepts, transmission characteristics, and the Ferranti effect.
By bridging theory and real-world practice, this seminar provides essential foundations for designers and analysts seeking a clear understanding of stability margins in synchronous machine design and excitation control behavior during power system interconnection.

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

23/04/2026

[White Papers] The efficiency map is an indispensable tool for motor development and FEA has become widely used to create them instead of using measurements. This is due to the FEA approach being less time consuming and available during the design phase. However, as efficiency of motors is becoming high, greater accuracy is required for the efficiency map since a significant part of the design work is devoted to improving efficiency. The conventional method takes several simplifications to reduce the creation time which cause accuracy issues. However, when created without those simplification, it provides results accurate enough for evaluating high efficiency designs. In this report, three methods are compared on a PMSM showing that the accurate version is necessary for advanced applications such as EV. It shows that the accurate version based on FEA without any simplification is necessary for creating efficiency maps with high accuracy.

[W-MO-164] Investigation in the Accuracy of FEA Based Efficiency Maps for PMSM Traction Machines
https://www.jmag-international.com/whitepapers/w-mo-164/

20/04/2026

[JMAG Users Conference Proceedings] Speedgoat GmbH
Torque ripple remains a critical challenge for precision control and NVH optimization in electric drive systems. While finite element (FEM) analysis using JMAG Designer accurately captures spatial harmonics and magnetic saturation effects, incorporating inverter switching dynamics often results in impractically long simulation times.
We present a real-time Hardware-in-the-Loop (HIL) methodology that combines JMAG-RT FEM motor data with a high-fidelity switching inverter model implemented in Simulink® and Simscape™ Electrical™. The resulting model runs on a Speedgoat HIL test system featuring a programmable FPGA I/O module, enabling sub-microsecond time steps while preserving all torque ripple contributions.
The complete workflow is addressed, supporting both Controller-HIL and Power-HIL configurations, to verify that production-ready control software and hardware achieve minimal torque ripple levels. The proposed methodology enables faster and more repeatable validation under realistic conditions, significantly reducing development cycle time and improving quality assurance.

Combining FEM-Based Torque Ripple and Switching Inverter Dynamics for Electric Drive Controller Validation on Speedgoat Test Systems
You can read the full paper here:https://www.jmag-international.com/conference_doc/uc2025_45/

16/04/2026

[Leaflet] Rare-Earth Barium Copper Oxide (REBCO) tape wire offers critical current density with a particularly high critical temperature compared to other high-temperature conductors for use in Tokamak fusion reactors and other such machines. However, REBCO tape does have critical current density characteristics that vary with the magnetic flux density and temperature. Simulations cannot ignore this anisotropy.
This case study compares the critical current density distributions of CORC cable formed by helically winding REBCO tape around a core obtained through simulations with and without the anisotropy of the magnetic flux density. The results demonstrate the importance of precisely modeling anisotropic materials to accurately reproduce the actual phenomenon.

[L-MA-220] Evaluations of CORC Cable Characteristics Accounting for Anisotropy
https://www.jmag-international.com/leaflet/l-ma-220/

14/04/2026

[JMAG Users Conference Proceedings] Mazda Motor Corporation
This case study introduces technologies to explore electronic power train designs during the product planning stage to realize the all-in-one process advocated by the Mazda Motor Corporation. The workflow combines methods to configure new motor models derived using the cross-section from motor specifications together with JMAG optimizations. We also examine the potential this workflow has in supporting decisions on designs during the initial development stage through examples visualizing the relationship between BEV performance, costs, and all-electric range.

You can read the full paper here:https://www.jmag-international.com/conference_doc/uc2025_27/

08/04/2026

[Application Catalog] It is important to solve the problem of temperature rise in order to achieve high motor efficiency and high output. Magnets are used in motors and display large variation in their properties verse temperature. For rare earth magnets at temperatures over hundred degrees demagnetization can occur. Since the presence or absence and degree of demagnetization are determined by a combination of the demagnetizing field and the temperature applied, it is necessary to pay attention to magnetic circuit design in addition to the heat resistance of magnets themselves. In particular, since it is easier for demagnetization to occur at locations where the coercive force is not sufficient due to incomplete magnetization, it is desirable to at the same time evaluate the coercive force distribution of magnets.
Using magnetic field analysis simulation that uses finite element method analysis, it is possible to evaluate motor characteristics at high temperatures and high loads by taking into account the thermal demagnetization characteristics verse coercive force distribution values obtained from magnetization analysis.
In this example, analysis is performed while varying the temperature of magnetized magnets, and then the influence on the torque waveform and magnetic flux density distribution is evaluated.
Magnetizable Material with Thermal Demagnetization Information

[JAC222] Irreversible Thermal Demagnetization Analysis of Incompletely Magnetized Magnets
https://www.jmag-international.com/catalog/222_ipm_mag_demag/

06/04/2026

Column: [No. 92] The Phasor Diagram and the Finite-element Method
The phasor diagram is fundamental in the theory and calculation of the steady-state operation of the synchronous machine (including both wound-field and permanent-magnet types). This is not simply a matter of convenience or convention: it is due to the fact that it represents the correspondence between spatially sine-distributed quantities around the air-gap (flux and ampere-conductors) and time-dependent terminal quantities (flux-linkage, voltage, and current) with nominally sinusoidal waveforms. This correspondence pertains strictly to the fundamental space-harmonic and time-harmonic components of the relevant quantities, implying steady-state operation which is naturally expressed in terms of complex numbers, i.e., phasors.

Read more:https://www.jmag-international.com/engineers_diary/092/

02/04/2026

[Application Catalog] Magnetic Resonance Imaging (MRI) requires a highly consistent and stable magnetic fields. However, NbTi, Nb3Sn, and other low-temperature superconducting magnets come with the risk of unforeseen quenching due to the low thermal stability of liquid helium cooling.
A no-insulation structure is one solution to this issue that has been gaining traction. The electrical contact between turns can reroute the current to a neighboring turn when localized quenching occurs to prevent the damage caused by overheating. Although it does reduce the risk of quenching, no-insulation structures can also cause instability in the charging behavior or magnetic field characteristics. That is why it is critical to run precise analyses during the design stage.
In this example, an NbTi superconducting magnet for an MRI machine that has a no-insulation structure that has a stabilizing layer with contact between turns and an insulation structure that does not have contact. The results verify the phenomenon that causes a delay in charging when the current flows between turns.

[JAC320] Voltage Characteristics Analysis of a No-Insulation NbTi Superconducting Coil
https://www.jmag-international.com/catalog/320_mrisuperconductorvoltage/

30/03/2026

Webinar: "Brush up on Motor Design!" has been released.
[Vol.70] The zero-power-factor characteristic and the Potier reactance
The 71st seminar reviews and systematically organizes the basics of equivalent circuits and phasor diagrams for synchronous machines and examines the relationship with finite element analysis (FEM). The video also touches on the difference between calculating the characteristics directly and calculating the characteristics through post-processing using FEM to clarify when to take advantage of equivalent circuit parameters in designs and evaluations. This seminar provides information essential for designers struggling to understand FEM results and anyone else who might want to review synchronous machine analysis.

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

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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