An analysis of inter-bar currents on a polyphase cage induction motor

This work uses a methodology based on 2D-finite element method (FEM) and on circuit theory (independent currents method) to analyze the inter-bar currents on the rotor of cage induction motors. The multislice technique is used to consider the skewing effect. Three conditions are considered: one inter-bar resistance; two inter-bar resistances; and three inter-bar resistances. The results show the distribution of currents in the rotor bars, short-circuit rings and transversal resistances at a given time. The fundamental component of the inter-bar and surrounding bar currents are shown to help understand the phenomenon.

[1]  V. Subba Rao,et al.  Stray losses of polyphase cage-induction motors with particular reference to the condition of imperfect rotor-barߝiron insulation , 1969 .

[2]  Siu Lau Ho,et al.  Inclusion of interbar currents in a network-field coupled time-stepping finite-element model of skewed-rotor induction motors , 1999 .

[3]  C. N. Glew.  Stray load losses in induction motors; a challenge to academia , 1997 .

[4]  F. Ishibashi,et al.  Study on Reliable Reduction of Stray Load Losses in Three-Phase Induction Motor for Mass Production , 1987, IEEE Transactions on Energy Conversion.

[5]  J. Gavarret,et al.  Traité d'électricité , 2022 .

[6]  S. L. Ho,et al.  Estimation of stray losses of skewed rotor induction motors using coupled 2-D and 3-D time stepping finite element methods , 1998 .

[7]  Stephen K. Williamson,et al.  Impact of inter-bar currents on the performance of the brushless doubly-fed motor , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[8]  I. Miki,et al.  Effect of crosspath resistance between adjacent rotor bars on performance of inverter-fed high speed induction motor , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[9]  N. Glew.  Stray load losses in induction motors: a challenge to academia , 1998 .

[10]  Adnan M. Odok,et al.  Stray-Load Losses and Stray Torques in Induction Machines , 1958, Transactions of the American Institute of Electrical Engineers Part III Power Apparatus and Systems.