Title :
On the reduction of magnetic pull in induction motors with off-centre rotor
Author_Institution :
Technion Israel Inst. of Technol., Haifa, Israel
Abstract :
The behavior of an induction motor with off-center rotor is investigated. The Maxwell stress between rotor and stator of an induction machine with static and dynamic eccentricity of the rotor is calculated for two types of connection between stator coils. Theoretical and laboratory results show that connections of coils of the stator winding in parallel, with equalizing branches, lead to drastic reduction in unbalanced magnetic pull. This reduction prevents problems of magnetic pull in machines with imperfectly centered rotors. A secondary effect of minor importance is the appearance of a vibrational component in the magnetic pull, with an amplitude less than 26% of that of the fundamental force component
Keywords :
force; induction motors; machine testing; machine theory; rotors; stators; vibrations; Maxwell stress; coils; eccentricity; fundamental force component; induction motors; machine testing; machine theory; magnetic pull; off-centre rotor; rotor; stator; vibrational component; Acoustic noise; Coils; Induction machines; Induction motors; Magnetic fields; Magnetic flux; Magnetic forces; Rotors; Stator windings; Stress;
Conference_Titel :
Industry Applications Society Annual Meeting, 1993., Conference Record of the 1993 IEEE
Conference_Location :
Toronto, Ont.
Print_ISBN :
0-7803-1462-X
DOI :
10.1109/IAS.1993.298946
