Pub Date : 2024-12-02DOI: 10.1109/TMAG.2024.3509873
Si-Uk Jung;Dong-Su Kim;Jae-Seung Lee;Jae-Woo Jung
In general, the interior permanent magnet synchronous motor (IPMSM) is mainly used as the traction motor of electric vehicles. IPMSM uses a rib and bridge structure to prevent permanent magnets (PMs) from being separated by centrifugal force when the motor rotates. Increasing the thickness of the ribs and bridges to satisfy rigidity at high speeds acts as a cause of increased leakage flux, thereby reducing motor performance. In this article, to improve the performance of IPMSM, we benchmark existing products to derive a proto analysis model and verify it through testing. In addition, the rib and bridge shapes that cause leakage flux are removed from the proto model and a carbon fiber-reinforced plastic (CFRP) sleeve is applied. Next, stress analysis is performed to confirm whether the safety factor is met at the required maximum speed. Also, as a result of comparing the no-load characteristics, it was confirmed that the leakage flux decreased and the back electromotive force (Back EMF) increased. However, in the case of the CFRP model with increased Back EMF, the current for field weakening control increases, making it difficult to drive at high speed. Therefore, an improvement design was performed to bring the field weakening current to the same level as the proto model. As a result, the CFRP model had a similar performance to the proto model and improved efficiency.
{"title":"Study on Performance Changes of EV Traction Motor Applying CFRP Sleeve to IPMSM","authors":"Si-Uk Jung;Dong-Su Kim;Jae-Seung Lee;Jae-Woo Jung","doi":"10.1109/TMAG.2024.3509873","DOIUrl":"https://doi.org/10.1109/TMAG.2024.3509873","url":null,"abstract":"In general, the interior permanent magnet synchronous motor (IPMSM) is mainly used as the traction motor of electric vehicles. IPMSM uses a rib and bridge structure to prevent permanent magnets (PMs) from being separated by centrifugal force when the motor rotates. Increasing the thickness of the ribs and bridges to satisfy rigidity at high speeds acts as a cause of increased leakage flux, thereby reducing motor performance. In this article, to improve the performance of IPMSM, we benchmark existing products to derive a proto analysis model and verify it through testing. In addition, the rib and bridge shapes that cause leakage flux are removed from the proto model and a carbon fiber-reinforced plastic (CFRP) sleeve is applied. Next, stress analysis is performed to confirm whether the safety factor is met at the required maximum speed. Also, as a result of comparing the no-load characteristics, it was confirmed that the leakage flux decreased and the back electromotive force (Back EMF) increased. However, in the case of the CFRP model with increased Back EMF, the current for field weakening control increases, making it difficult to drive at high speed. Therefore, an improvement design was performed to bring the field weakening current to the same level as the proto model. As a result, the CFRP model had a similar performance to the proto model and improved efficiency.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 3","pages":"1-4"},"PeriodicalIF":2.1,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143496582","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Decreasing spherical harmonic functions are widely used to identify and extrapolate the magnetic field produced by various devices. These functions allow to represent the sources as equivalent multipoles whose order is associated with a specific spatial decreasing rate. However, this representation is not valid inside the Brillouin sphere, the smallest sphere enclosing the device. We introduce here the use of an alternative model to replace the spherical harmonic functions when the measurements are inside the Brillouin sphere. This representation corresponds to a harmonic basis of equivalent charges on a surface that reproduces the multipolar decomposition of the magnetic field outside the Brillouin sphere while being valid inside. We demonstrate here the ability of this model to identify and extrapolate the field from very close measurements.
{"title":"Identification of an Arbitrary-Surface Harmonic Magnetic Model From Close Measurements","authors":"Gauthier Derenty-Camenen;Olivier Chadebec;Olivier Pinaud;Laure-Line Rouve;Steeve Zozor","doi":"10.1109/TMAG.2024.3510643","DOIUrl":"https://doi.org/10.1109/TMAG.2024.3510643","url":null,"abstract":"Decreasing spherical harmonic functions are widely used to identify and extrapolate the magnetic field produced by various devices. These functions allow to represent the sources as equivalent multipoles whose order is associated with a specific spatial decreasing rate. However, this representation is not valid inside the Brillouin sphere, the smallest sphere enclosing the device. We introduce here the use of an alternative model to replace the spherical harmonic functions when the measurements are inside the Brillouin sphere. This representation corresponds to a harmonic basis of equivalent charges on a surface that reproduces the multipolar decomposition of the magnetic field outside the Brillouin sphere while being valid inside. We demonstrate here the ability of this model to identify and extrapolate the field from very close measurements.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 1","pages":"1-4"},"PeriodicalIF":2.1,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142912569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-29DOI: 10.1109/TMAG.2024.3509214
Kristjan Ottar Klausen;Snorri Ingvarsson
The Landau–Lifshitz–Gilbert (LLG) equation for magnetization dynamics is recast into spinor form using the real-valued Clifford algebra (geometric algebra) of three-space. We show how the undamped case can be explicitly solved to obtain componentwise solutions, with clear geometrical meaning. Generalizations of the approach to include damping are formulated. The implications of the axial property of the magnetization vector are briefly discussed.
{"title":"Spinor Formulation of the Landau–Lifshitz–Gilbert Equation With Geometric Algebra","authors":"Kristjan Ottar Klausen;Snorri Ingvarsson","doi":"10.1109/TMAG.2024.3509214","DOIUrl":"https://doi.org/10.1109/TMAG.2024.3509214","url":null,"abstract":"The Landau–Lifshitz–Gilbert (LLG) equation for magnetization dynamics is recast into spinor form using the real-valued Clifford algebra (geometric algebra) of three-space. We show how the undamped case can be explicitly solved to obtain componentwise solutions, with clear geometrical meaning. Generalizations of the approach to include damping are formulated. The implications of the axial property of the magnetization vector are briefly discussed.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 1","pages":"1-5"},"PeriodicalIF":2.1,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142912567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-27DOI: 10.1109/TMAG.2024.3507612
Robert J. Deissler;Robert Brown
We study the orientation in a uniform magnetic field of rod-like anisotropic biofluid crystals with an easy plane that makes an oblique angle with the crystal’s c-axis. For a sufficiently strong field, these crystalline rods orient themselves, such that the crystal’s easy plane is parallel to the magnetic field, the rod’s direction being defined as the direction of the crystal’s c-axis. As the rod rotates about the crystal’s hard axis, there will, therefore, be a range of angles that the rod makes with the magnetic field. We detail this behavior by first providing the illustrations of hemozoin crystals at various orientations. These illustrations clearly demonstrate that the orientation angle that the crystalline rod makes with respect to the magnetic field varies from about 30° to 150°. We also derive an analytical expression for the probability density function (pdf) for the orientation angle. We find that the orientation angles are not uniformly distributed between the limits of 30° and 150°, but rather tend to cluster near these limits. This suggests experimental tests and addresses confusion about the rod orientation found in past literature. The relevance to other anisotropic biofluid crystals, such as those produced by gout, is also discussed.
{"title":"Easy-Plane Alignment of Anisotropic Biofluid Crystals in a Magnetic Field: Implications for Rod Orientation","authors":"Robert J. Deissler;Robert Brown","doi":"10.1109/TMAG.2024.3507612","DOIUrl":"https://doi.org/10.1109/TMAG.2024.3507612","url":null,"abstract":"We study the orientation in a uniform magnetic field of rod-like anisotropic biofluid crystals with an easy plane that makes an oblique angle with the crystal’s c-axis. For a sufficiently strong field, these crystalline rods orient themselves, such that the crystal’s easy plane is parallel to the magnetic field, the rod’s direction being defined as the direction of the crystal’s c-axis. As the rod rotates about the crystal’s hard axis, there will, therefore, be a range of angles that the rod makes with the magnetic field. We detail this behavior by first providing the illustrations of hemozoin crystals at various orientations. These illustrations clearly demonstrate that the orientation angle that the crystalline rod makes with respect to the magnetic field varies from about 30° to 150°. We also derive an analytical expression for the probability density function (pdf) for the orientation angle. We find that the orientation angles are not uniformly distributed between the limits of 30° and 150°, but rather tend to cluster near these limits. This suggests experimental tests and addresses confusion about the rod orientation found in past literature. The relevance to other anisotropic biofluid crystals, such as those produced by gout, is also discussed.","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"61 1","pages":"1-8"},"PeriodicalIF":2.1,"publicationDate":"2024-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142912399","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-26DOI: 10.1109/TMAG.2024.3504413
{"title":"TechRxiv: Share Your Preprint Research with the World!","authors":"","doi":"10.1109/TMAG.2024.3504413","DOIUrl":"https://doi.org/10.1109/TMAG.2024.3504413","url":null,"abstract":"","PeriodicalId":13405,"journal":{"name":"IEEE Transactions on Magnetics","volume":"60 12","pages":"1-1"},"PeriodicalIF":2.1,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10767877","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：