Title :
Improvement of demagnetization by rotor structure of IPMSM with Dy-free rare-earth magnet
Author :
Imamura, Kousuke ; Sanada, Masayuki ; Morimoto, Shigeo ; Inoue, Yasuyuki
Author_Institution :
Osaka Prefecture Univ., Sakai, Japan
Abstract :
Permanent magnet (PM) motors that employ rare-earth magnets containing dysprosium (Dy) are used in electric and hybrid electric vehicles. However, it is desirable to reduce the amount of Dy used since it is expensive. This study investigates the rotor structure of a PM synchronous motor with a Dy-free rare-earth magnet. Flux barrier shapes and PM thicknesses that enhance the irreversible demagnetization are investigated. In addition, a rotor structure that improves the irreversible demagnetization is proposed. We demonstrate that the proposed rotor structure without Dy improves the irreversible demagnetization.
Keywords :
hybrid electric vehicles; permanent magnet motors; rotors; synchronous motors; Dy-free rare-earth magnet; IPMSM; flux barrier shapes; hybrid electric vehicles; interior permanent magnet synchronous motors; irreversible demagnetization improvement; rare-earth magnets containing dysprosium; rotor structure; Current density; Demagnetization; Magnetic flux; Rotors; Shape; Stators; Torque; Dy; IPMSM; demagnetization; rare-earth magnet;
Conference_Titel :
Electrical Machines and Systems (ICEMS), 2012 15th International Conference on
Conference_Location :
Sapporo
Print_ISBN :
978-1-4673-2327-7