Harmonic field analysis for slip-ring motors including general rotor asymmetry

Author

Smith, A.C.

Author_Institution

Imperial Coll. of Sci., Technol. & Med., London, UK

fYear

1989

fDate

1-5 Oct. 1989

Firstpage

31

Abstract

The author presents a field analysis for slip-ring induction motors with general external impedance asymmetry. The method is based upon a rotating-field theory approach including spatial magnetomotive force harmonics. It is shown that a series of nonmains frequency voltages are induced in the stator winding for both balanced and unbalanced rotors. The method is also used to derive the harmonic equivalent circuit for a balanced three-phase slip-ring motor with a skewed rotor. The analysis is verified by comparing predicted torque and current characteristics with measured values obtained from a machine with a balanced rotor and with a rotor connected to asymmetrical external resistances.<>

Keywords

harmonics; induction motors; rotors; current characteristics; harmonic equivalent circuit; nonmains frequency voltages; rotating-field theory; skewed rotor; slip-ring induction motors; spatial magnetomotive force harmonics; torque characteristics; Current measurement; Equivalent circuits; Frequency; Harmonic analysis; Impedance; Induction motors; Magnetic analysis; Rotors; Stator windings; Voltage;

fLanguage

English

Publisher

ieee

Conference_Titel

Industry Applications Society Annual Meeting, 1989., Conference Record of the 1989 IEEE

Conference_Location

San Diego, CA, USA

Type

conf

DOI

10.1109/IAS.1989.96627

Filename

96627