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Improving high-speed electrical machines by amorphous metals

Ou, Jing

Abstract (englisch):
This dissertation is about the application of an amorphous magnetic material (AMM) to a sleeve-free interior permanent-magnet (PM) rotor of high-speed synchronous motors. Currently, surface-mounted PM rotors are commonly used in the high-speed motors. In order to protect the high-speed rotors from centrifugal forces, high-strength non-ferromagnetic sleeves are required. This results in a reduced torque density, lowered flux-weakening ability, and highen losses of the motor caused by pulse-width-modulation (PWM) voltage. Hence, a sleeve-free rotor structure is beneficial.
AMM has been used for transformers and inductors for decades. It is well-known due to its low core losses. However, because of its high hardness and brittleness, slotting becomes a key obstacle to its application in electrical machines. Hence, this material has not been widely applied in the electrical machines yet. An important property, the high mechanical strength of the AMM has been ignored eagerly. In this work, an interior PM rotor made from AMM for high-speed operation is studied. The high mechanical strength and the low core losses of the AMM are fully taken use of. ... mehr

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Volltext §
DOI: 10.5445/IR/1000104290
Veröffentlicht am 23.12.2019
Cover der Publikation
Zugehörige Institution(en) am KIT Elektrotechnisches Institut (ETI)
Publikationstyp Hochschulschrift
Publikationsjahr 2019
Sprache Englisch
Identifikator KITopen-ID: 1000104290
Verlag Karlsruhe
Umfang XV, 191 S.
Art der Arbeit Dissertation
Fakultät Fakultät für Elektrotechnik und Informationstechnik (ETIT)
Institut Elektrotechnisches Institut (ETI)
Prüfungsdatum 06.12.2019
Referent/Betreuer Prof. M. Doppelbauer
KIT – Die Forschungsuniversität in der Helmholtz-Gemeinschaft
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