Effects of rotor eccentricity and parallel windings on induction machine behavior: A study using finite element analysis

Journal Article · Mon Mar 01 04:00:00 EST 1993 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/20.250728· OSTI ID:6504917

DeBortoli, M J ^[1]; Salon, S J; Burow, D W ^[2]; Slavik, C J ^[3]

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1. Magsoft Corp., Troy, NY (United States)
2. Rensselaer Polytechnic Inst., Troy, NY (United States)
3. General Electric Co., Schenectady, NY (United States)

An eccentrically-positioned rotor in a rotating electric machine experiences a strong unbalanced pull toward the short side of the air gap. The air gap flux density and magnetic force distributions exhibit new harmonics resulting from the nonuniform air gap. Use of parallel windings reduces the net unbalanced pull by allowing different amplitude currents to flow in the parallel branches. In this paper, rotor eccentricity and the effect of parallel winding in an induction motor are investigated by means of a transient finite element model. Magnetic flux density and force distribution harmonics generated by the model are presented for the cases of static and dynamic rotor eccentricity, with various combinations of series and parallel stator winding connections. These results are compared with those obtained from a centered rotor case. Examples of the action of parallel-connected windings to reduce the effects of rotor eccentricity are given.

• OSTI ID: 6504917
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States) Vol. 29:2; ISSN IEMGAQ; ISSN 0018-9464
• Country of Publication: United States
• Language: English

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