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Rare-Earth Free Electric Machine for High Performance Applications.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Rare-Earth Free Electric Machine for High Performance Applications./
作者:	Chowdhury, Mazharul H.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2021,
面頁冊數:	170 p.
附註:	Source: Dissertations Abstracts International, Volume: 83-08, Section: B.
Contained By:	Dissertations Abstracts International83-08B.
標題:	Design optimization. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28973095
ISBN:	9798780654957

Rare-Earth Free Electric Machine for High Performance Applications.
Chowdhury, Mazharul H.

Rare-Earth Free Electric Machine for High Performance Applications. - Ann Arbor : ProQuest Dissertations & Theses, 2021 - 170 p.

Source: Dissertations Abstracts International, Volume: 83-08, Section: B.

Thesis (Ph.D.)--North Carolina State University, 2021.

This item must not be sold to any third party vendors.

The brushless permanent magnet machines is the key components of the high performance actuators. The use of high-density rare-earth magnets in brushless permanent magnet machines provides high torque density. However, Permanent magnet is the largest cost driver for high performance electrical machine. The per unit cost of rare-earth material is significant higher compared to the other components in the machine such as steel and copper. Moreover, the cost of these materials are fluctuated over time due to the limited source and availability of these materials worldwide. The push for green energy to reduce carbon emission drives electrification in propulsion system of car. Permanent magnet machines are also dominant in that application due to their high performance. The magnet use in permanent magnet machines for traction applications are much higher. Therefore, rare-earth materials are considered as the critical elements by department of energy (DOE). Alternative machines that does not utilize rare-earth magnets are required to investigate to overcome both cost and uncertainty in magnet materials.This dissertation presents the research and development of alternative electric machines for the high performance applications such as automotive or aerospace. Synchronous reluctance (S y n c R e l) machine considered as an alternative for this study. The absence of permanent magnets in SyncRel motors not only eliminates supply demand intricacies associated with rare-earth materials but also offers certain performance benefits under rugged environment conditions. The losses due to magnets in the rotor is not present in SyncRel motors, which helps with motor thermal management. The elimination of magnets in the rotor also enable SyncRel machine to operate at higher electrical loading and temperature as the magnet demagnetization issue is not a concern.The torque ripple requirement is very stringent in high performance applications. Therefore, an analytical model has been proposed to predict the torque in synchronous reluctance machine. Flux linkage or inductance harmonics based analytical model has been developed to predict the instantaneous electromagnetic torque along with its ripple content for a synchronous reluctance machine.The study presents a torque ripple minimization process using symmetrical rotor flux barrier shaping for synchronous reluctance (SyncRel) machines. An iterative design approach incorporating electromagnetic, structural and thermal analyses is presented that led to the design of a SyncRel motor with low torque ripple. The contributions demonstrated that the 30 slot, 4 pole SyncRel machine is a viable option for high performance drive and packaging constrained applications. The 30 slot 4 pole synchronous reluctance performance is also compared with 24 slot 4 pole and 27 slot 6 pole synchronous reluctance machine.The 30 slot 4 pole SyncRel machine is evaluated for dual wound machine drive. The performance of 30 slot 4 pole synchronous reluctance machine is compared with 12 slot 8 pole IPM machine. IPM machine shows better packaging under normal operating condition compare to SyncRel machines. However, IPM machine suffers due to their high braking torque in case of three-phase short circuit failure. The concept of braking torque in synchronous reluctance machine is introduced to explain the torque loss in case of short circuit fault in the half of the machine. The reduction of torque in SyncRel machine during the faulty condition can be mitigated by appropriate sizing of the motor. This is difficult in an IPM machine, especially in case of short circuit fault. IPM machine braking torque increases higher due to the strong permanent magnet and makes it difficult to provide the desired assist if the system requires 50 % of torque during the fault in one winding set. Therefore, proposed 30 slot 4 pole machine as an viable candidate for dual wound drive.

ISBN: 9798780654957Subjects--Topical Terms:

3681984
Design optimization.

Rare-Earth Free Electric Machine for High Performance Applications.
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035 $a (MiAaPQ)AAI28973095
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100 1 $a Chowdhury, Mazharul H. $3 3683933
245 1 0 $a Rare-Earth Free Electric Machine for High Performance Applications.
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300 $a 170 p.
500 $a Source: Dissertations Abstracts International, Volume: 83-08, Section: B.
500 $a Advisor: Mikail, Rajib;Islam, Mohammad;Liu, Jun;Lukic, Srdjan;Husain, Iqbal.
502 $a Thesis (Ph.D.)--North Carolina State University, 2021.
506 $a This item must not be sold to any third party vendors.
520 $a The brushless permanent magnet machines is the key components of the high performance actuators. The use of high-density rare-earth magnets in brushless permanent magnet machines provides high torque density. However, Permanent magnet is the largest cost driver for high performance electrical machine. The per unit cost of rare-earth material is significant higher compared to the other components in the machine such as steel and copper. Moreover, the cost of these materials are fluctuated over time due to the limited source and availability of these materials worldwide. The push for green energy to reduce carbon emission drives electrification in propulsion system of car. Permanent magnet machines are also dominant in that application due to their high performance. The magnet use in permanent magnet machines for traction applications are much higher. Therefore, rare-earth materials are considered as the critical elements by department of energy (DOE). Alternative machines that does not utilize rare-earth magnets are required to investigate to overcome both cost and uncertainty in magnet materials.This dissertation presents the research and development of alternative electric machines for the high performance applications such as automotive or aerospace. Synchronous reluctance (S y n c R e l) machine considered as an alternative for this study. The absence of permanent magnets in SyncRel motors not only eliminates supply demand intricacies associated with rare-earth materials but also offers certain performance benefits under rugged environment conditions. The losses due to magnets in the rotor is not present in SyncRel motors, which helps with motor thermal management. The elimination of magnets in the rotor also enable SyncRel machine to operate at higher electrical loading and temperature as the magnet demagnetization issue is not a concern.The torque ripple requirement is very stringent in high performance applications. Therefore, an analytical model has been proposed to predict the torque in synchronous reluctance machine. Flux linkage or inductance harmonics based analytical model has been developed to predict the instantaneous electromagnetic torque along with its ripple content for a synchronous reluctance machine.The study presents a torque ripple minimization process using symmetrical rotor flux barrier shaping for synchronous reluctance (SyncRel) machines. An iterative design approach incorporating electromagnetic, structural and thermal analyses is presented that led to the design of a SyncRel motor with low torque ripple. The contributions demonstrated that the 30 slot, 4 pole SyncRel machine is a viable option for high performance drive and packaging constrained applications. The 30 slot 4 pole synchronous reluctance performance is also compared with 24 slot 4 pole and 27 slot 6 pole synchronous reluctance machine.The 30 slot 4 pole SyncRel machine is evaluated for dual wound machine drive. The performance of 30 slot 4 pole synchronous reluctance machine is compared with 12 slot 8 pole IPM machine. IPM machine shows better packaging under normal operating condition compare to SyncRel machines. However, IPM machine suffers due to their high braking torque in case of three-phase short circuit failure. The concept of braking torque in synchronous reluctance machine is introduced to explain the torque loss in case of short circuit fault in the half of the machine. The reduction of torque in SyncRel machine during the faulty condition can be mitigated by appropriate sizing of the motor. This is difficult in an IPM machine, especially in case of short circuit fault. IPM machine braking torque increases higher due to the strong permanent magnet and makes it difficult to provide the desired assist if the system requires 50 % of torque during the fault in one winding set. Therefore, proposed 30 slot 4 pole machine as an viable candidate for dual wound drive.
590 $a School code: 0155.
650 4 $a Design optimization. $3 3681984
650 4 $a Simulation. $3 644748
650 4 $a Stress analysis. $3 3681390
650 4 $a Electromagnetics. $3 3173223
650 4 $a Mechanics. $3 525881
650 4 $a Electrical engineering. $3 649834
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710 2 $a North Carolina State University. $3 1018772
773 0 $t Dissertations Abstracts International $g 83-08B.
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792 $a 2021
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=28973095