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Reducing Permanent Magnet Loss in Interior Permanent Magnet Machines Using Slotted Magnets

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Reducing Permanent Magnet Loss in Interior Permanent Magnet Machines Using Slotted Magnets/ Jeremiah Vannest.
作者:	Vannest, Jeremiah,
面頁冊數:	1 electronic resource (172 pages)
附註:	Source: Dissertations Abstracts International, Volume: 86-11, Section: B.
Contained By:	Dissertations Abstracts International86-11B.
標題:	Engineering. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=32111935
ISBN:	9798314890875

Reducing Permanent Magnet Loss in Interior Permanent Magnet Machines Using Slotted Magnets
Vannest, Jeremiah,

Reducing Permanent Magnet Loss in Interior Permanent Magnet Machines Using Slotted Magnets [eletronic resource] /Jeremiah Vannest. - 1 electronic resource (172 pages)

Source: Dissertations Abstracts International, Volume: 86-11, Section: B.

Permanent magnet losses in interior permanent magnet (IPM) motors can result in high magnet temperatures and potential demagnetization. This work investigates the use of slotted magnets or partially segmented magnets as an alternative to traditional segmented magnets to reduce these losses. Slotted magnets do not require full segmentation of the magnet, resulting in fewer components to reduce rotor assembly costs. The main drawback is that the mechanical integrity of the magnets is weakened, and the active material is removed from the magnets, resulting in a small decrease in performance. An analytical model for estimating the reduction in permanent magnet loss achieved after slotting a bulk magnet was developed based on the estimated current paths. The model is unable to consider the effect of the reaction field of the eddy currents and. therefore, overestimates the loss reduction from slotting.The finite element (FE) modeling of slotted permanent magnet losses in IPM motors was investigated for more accurate permanent magnet loss estimation. Key factors for accurate simulations were identified as using 3D-FE models and including switching harmonics in the simulation. This results in computationally expensive simulations. Various configurations and orientations of slotting were examined in FE analysis to assess their impact on the eddy current losses. Among the different approaches, axial slotting of the magnets proved to be the most effective for the baseline IPM motor's aspect ratio. While full segmentation of the magnets achieved greater loss reduction than slotted magnets, it also introduced a higher number of components which increases costs. This study also explores several methods for measuring permanent magnet loss in IPM machines. A locked rotor test fixture was designed to measure losses induced by switching harmonics. Ac loss measurements for the test fixture were conducted to compare bulk and slotted magnets. The results showed a significant reduction in permanent magnet loss for the slotted magnets compared to bulk magnets, particu-larly at higher currents and across all tested switching frequencies and phase angles. Additionally, the transient temperature of the slotted magnets was found to be 12°C lower than that of the bulk magnets after a 30-minute test. Loss separation in the test fixture was attempted using a combination of analytical calculations and FE simulations. While the general trend of permanent magnet loss reduction was captured, the overall losses were significantly underestimated. The primary source of error in the modeling was the core loss model, which was constrained by the limitations of the FE software package.

English

ISBN: 9798314890875Subjects--Topical Terms:

561152
Engineering.
Subjects--Index Terms:

Interior permanent magnet

Reducing Permanent Magnet Loss in Interior Permanent Magnet Machines Using Slotted Magnets
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520 # $a Permanent magnet losses in interior permanent magnet (IPM) motors can result in high magnet temperatures and potential demagnetization. This work investigates the use of slotted magnets or partially segmented magnets as an alternative to traditional segmented magnets to reduce these losses. Slotted magnets do not require full segmentation of the magnet, resulting in fewer components to reduce rotor assembly costs. The main drawback is that the mechanical integrity of the magnets is weakened, and the active material is removed from the magnets, resulting in a small decrease in performance. An analytical model for estimating the reduction in permanent magnet loss achieved after slotting a bulk magnet was developed based on the estimated current paths. The model is unable to consider the effect of the reaction field of the eddy currents and. therefore, overestimates the loss reduction from slotting.The finite element (FE) modeling of slotted permanent magnet losses in IPM motors was investigated for more accurate permanent magnet loss estimation. Key factors for accurate simulations were identified as using 3D-FE models and including switching harmonics in the simulation. This results in computationally expensive simulations. Various configurations and orientations of slotting were examined in FE analysis to assess their impact on the eddy current losses. Among the different approaches, axial slotting of the magnets proved to be the most effective for the baseline IPM motor's aspect ratio. While full segmentation of the magnets achieved greater loss reduction than slotted magnets, it also introduced a higher number of components which increases costs. This study also explores several methods for measuring permanent magnet loss in IPM machines. A locked rotor test fixture was designed to measure losses induced by switching harmonics. Ac loss measurements for the test fixture were conducted to compare bulk and slotted magnets. The results showed a significant reduction in permanent magnet loss for the slotted magnets compared to bulk magnets, particu-larly at higher currents and across all tested switching frequencies and phase angles. Additionally, the transient temperature of the slotted magnets was found to be 12°C lower than that of the bulk magnets after a 30-minute test. Loss separation in the test fixture was attempted using a combination of analytical calculations and FE simulations. While the general trend of permanent magnet loss reduction was captured, the overall losses were significantly underestimated. The primary source of error in the modeling was the core loss model, which was constrained by the limitations of the FE software package.
546 $a English
590 $a School code: 0168
650 # 4 $a Engineering. $3 561152
650 # 4 $a Computer engineering. $3 569006
650 # 4 $a Electrical engineering. $3 596380
653 # # $a Interior permanent magnet
653 # # $a High magnet temperature
653 # # $a Finite element
653 # # $a FE software package
653 # # $a Bulk magnet
690 $a 0544
690 $a 0464
690 $a 0537
710 2 # $a The Ohio State University. $b Electrical and Computer Engineering. $3 845530
720 1 $a Zhang, Julia $e degree supervisor.
773 0 # $t Dissertations Abstracts International $g 86-11B.
790 $a 0168
791 $a Ph.D.
792 $a 2025
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