Dynamic characteristics of synchronous motors applying a plural sub-magnets scheme to the rotor

Author

Jeon, W.J. ; Watanabe, H. ; Nakamoto, A. ; Kamiya, Y. ; Onuki, T.

Author_Institution

Dept. of Electr. Electron. & Comput. Eng., Waseda Univ., Tokyo, Japan

Volume

35

Issue

5

fYear

1999

fDate

9/1/1999 12:00:00 AM

Firstpage

3574

Lastpage

3576

Abstract

This paper treats the optimization of rotor construction in the permanent magnet synchronous motor (PMSM). While the field system of PMSM has generally one magnet per pole, we replace the magnet with plural sub-magnets. The dimensions of each sub-magnet are determined by the concept of pulse width modulation (PWM). By adopting the proposed rotor construction, we can not only reduce the spare harmonics of the air-gap field but also provide space for damper winding around the direct-axis. From the investigation by hybrid FE-BE (coupled finite element and boundary element) method combined with both electric circuit and motion equation, we verify that the proposed construction is effective for practical use in view of both the harmonics reduction and the damping effects

Keywords

boundary-elements methods; damping; finite element analysis; permanent magnet motors; pulse width modulation; rotors; synchronous motors; air-gap field; coupled finite element/boundary element method; damper winding; damping effects; dynamic characteristics; harmonics reduction; permanent magnet synchronous motor; plural sub-magnets scheme; pulse width modulation; rotor construction; Air gaps; Coupling circuits; Damping; Finite element methods; Permanent magnet motors; Pulse width modulation; Rotors; Shock absorbers; Space vector pulse width modulation; Synchronous motors;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.800594

Filename

800594