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Today, we present a case study with updated content in January.

[JAC285] Integrated Magnetization Analysis of an SPM Motor by Magnetizing Multiple Times


Permanent Magnet Synchronous motors (PMSM) sometimes use a method known as integrated magnetization. This is where magnets are assembled without magnetization then magnetized after the assembly. Depending on the combination of the number of poles and slots, the magnets may not be sufficiently magnetized by just one magnetization. The magnets are then magnetized more than once by rotating the rotor or changing the current values. In situations like these, the design must prevent the irreversible demagnetization of the magnets that have been previously magnetized.

By using a magnetic field analysis simulation which uses the finite element method, you can check the magnetization distribution that occurs in the magnets as the result of the magnetization conditions. By accounting for magnetic hysteresis during this process, the magnetization distribution in the magnets can be evaluated at a higher accuracy.
In this example, the magnets are magnetized more than once with the rotor at different positions to evaluate the magnetization distribution in the magnets while also accounting for hysteresis.

Magnetization Field Distribution

The magnetization field distribution and the magnetic flux line diagram when the magnetization current is 1 kA are shown in Fig. 1. The magnets are evaluated for the 1st and 2nd magnetizations. In the analysis, the magnets are evaluated as being arranged in the same positions. In the diagram, the stator side is shown as having been rotated. Note that the magnets are arranged in a radially outward orientation direction.

In the 1st magnetization, the magnetic fields are weak in the center of the magnet because the center of the magnetic pole faces the slot opening part. To ensure that the magnets are fully magnetized, for the 2nd magnetization, the magnetic pole instead faces the center of the tooth. Looking at the magnetization distribution of the 2nd magnetization, we see this occurring in the opposite direction of the orientation direction at the ends of the magnet.

Please see the website for “Magnetization Distribution of the Magnet Positioned in the Air”.

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Sample data is available to JMAG proper users and requires license ID to access.
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JMAG Open Interface programs

We have updated our site introducing case studies of linked analysis.
In recent years, the sophistication of electrical equipment design is required. As known there is a limit to the design of magnetic circuits alone, therefore multifaceted evaluations such as structure, vibration, heat, and control are required at the same time.It is more efficient to perform coupled analysis by linking different software where they have their own strength in the respective physical phenomenon rather than to adhere to one CAE software.

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On the same page, we also introduce case studies from the presentation materials from JMAG Users Conference Proceedings every week.
This week, we present a case study from TODA RACING Co., Ltd.
Please access the page above to view the case study.

[Free Webinar] Introducing JMAG-Designer Ver.22.0

In December 2022, JMAG-Designer Ver.22.0 was released.
Powersys, a JMAG distributor, introduces JMAG-Designer Ver. 22.0.

[US session] February 23, 2023 01:00 PM
[EU session] February 23, 2023 10:00 AM

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