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[W-MA-195] Influence of Symmetric BH Loop Fluctuations on Hysteresis Loss by Play Model
Accurate prediction of losses is a critical subject in machine design for advanced applications such as an electric vehicle (EV) since it provides important information for loss reduction and better cooling configuration. Although loss prediction techniques have been improved, estimating hysteresis loss of the lamination steel is still challenging. Conventional methods are based on Steinmetz’s empirical equation, which does not have the ability to reproduce minor loops. The loss that comes from minor loops is non-negligeable in the advanced machine designs and an alternative method is required.
The Play model is a magnetization model to reproduce arbitrary minor loops. The advantage of the Play model is that it does not require BH (magnetic flux density B and magnetic field H) information at the actual operating conditions, which are sometimes difficult to generate in material measurements, but requires only symmetric BH loops measured in the static condition. Furthermore, the model can be used in eddy current calculation with the electromagnetic finite element analysis (FEA) to reproduce minor loops in dynamic fields with the static BH loops. Therefore, the Play model is often used for accurate loss calculations thanks to the desirable representation ability.
A remaining issue of the Play model is the preparation of the BH loops. The reason is the following. The resolution of the minor loop representation is determined by the resolution of the BH loops, which is the number of BH loops in a range of magnetic density. As the number of BH loops increases, the interval between BH loops decreases. Therefore, the error of the measurements has to be small enough compared to the interval and the preparation of the BH loops becomes difficult as the requirement for the accuracy of a minor loop becomes high. Since there is a limit to measurement quality in practice and it is impossible to obtain the ideal BH loops, a certain level of fluctuations caused by measurements of the BH loops needs to be accepted. Therefore, it is important to understand the influence of fluctuations on the accuracy of the minor loops.
In this paper, we clarify the influence mechanism from fluctuations of the symmetric BH loops to a resulting minor loop and estimate errors caused by the fluctuations. The detail of measurement is described in the next section. Section III describes the relationship between the BH loops and a minor loop for typical operating conditions. The errors are estimated based on the relationship and numerically validated in Section 4 followed by conclusions in Section 5.
To read more, please see the following page!
JMAG Users Conference 2025 in Taiwan
The annual Taiwan JMAG User Conference is back! We warmly invite JMAG users and motor design professionals to join us for a day of insightful exchange and cutting-edge applications. Highlights include simulation and measurement validation, Taiwan’s advanced motor development trends, and a session on bridging real machines and digital models in modern engineering. You’ll also explore 3D electromagnetic simulation for axial flux motors and discover the latest JMAG features that support smarter motor design.
Seats are limited—register now and connect with Taiwan’s leading motor innovation community!
Dates: September 11th, 2025 from 13:00-17:00 (CST)
Venue: Sheraton Hsinchu Hotel (Hsinchu, Taiwan)
JMAG Users Conference & Training 2025 in Germany
This is to announce that the Europe JMAG distributor POWERSYS will be holding the JMAG Users Conference in Germany.
The conference will be held over two days; the first day will be Training, and JMAG Users Conference will consist of the second day.
This event is a unique opportunity to engage with industry leaders and experts at the forefront of electric motor innovation. Join us as we explore the latest technologies driving the race to virtual prototyping.
Come join us!
Dates:
– BEGINNER TRAINING
– ADVANCED TRAINING
Sep. 30th
– Advanced e-Motor Design with JMAG (JMAG Users Conference)
Oct. 1st
Location: LE MERIDIEN (Stuttgart, Germany)
