Title :
Analysis of electromagnetic and thermal fields for induction motors during starting
Author :
Chan, C.C. ; Yan, Lietong ; Chen, Pizhang ; Wang, Zezhong ; Chau, K.T.
Author_Institution :
Dept. of Electr. & Electron. Eng., Hong Kong Univ., Hong Kong
fDate :
3/1/1994 12:00:00 AM
Abstract :
In order to improve the starting performance of squirrel-cage induction motors, the so-called “skin effect” becomes very serious, which causes a highly uneven distribution of rotor-bar currents. The corresponding conduction losses of the upper and lower portions of rotor bars create high thermal stress, which may damage the rotor bars, particularly at the junction of rotor bars and end-rings. Hence, it is important to predict the starting and operating characteristics of induction motors more accurately for the purpose of ensuring the reliability of motor operation. This paper employs a visual-aided finite-element method to analyze the electromagnetic and thermal fields of induction motors during starting. By using visual and interactive pre- and post-processing techniques, the analysis can be applied to squirrel-cage induction motors with any physical dimensions, material properties, and system parameters. The starting performance, including the distributions of magnetic flux density, current density, loss density and temperature rise, are presented dynamically by computer animation, which are convenient and powerful for the evaluation and design optimization of induction motors. The theoretical predictions are verified by direct comparison with experimental results
Keywords :
computer animation; electric machine analysis computing; electromagnetic fields; finite element analysis; rotors; squirrel cage motors; starting; thermal analysis; computer animation; conduction losses; current density; electromagnetic fields; end-rings; loss density; magnetic flux density; reliability; rotor-bar currents; skin effect; squirrel-cage induction motors; starting; temperature rise; thermal fields; thermal stress; visual-aided finite-element method; Bars; Electromagnetic analysis; Electromagnetic fields; Electromagnetic induction; Finite element methods; Induction motors; Magnetic analysis; Rotors; Thermal conductivity; Thermal stresses;
Journal_Title :
Energy Conversion, IEEE Transactions on