Title :
Analysis of three-phase induction motors utilizing `The Iodekice Locus´-a normalized impedance circle
Author :
Skaar, Donald L.
Author_Institution :
San Diego State Univ., CA, USA
fDate :
11/1/1991 12:00:00 AM
Abstract :
A method that allows students to analyze the performance of any three-phase induction motor operating at any arbitrary speed, either analytically or graphically, using the same conceptual approach is presented. The method uses a unity-diameter normalized impedance circle with a periphery calibrated in terms of normalized slip, which is defined as the ratio of per unit slip to a readily determined machine constant. Equations that allow the tabulation of the real and imaginery impedance components of the normalized circle as a function of normalized slip are developed. These data may be plotted for use with graphical analysis or used directly in a simplified mathematical analysis. The key factor in the development is shown to be the concept of normalized slip. Using this concept, the specific operating point of a machine can be simply and uniquely determined for any given value of per unit slip
Keywords :
induction motors; 3-phase induction motors; Iodekice locus; normalized slip; performance; unity-diameter normalized impedance circle; Admittance; Equations; Helium; Impedance; Induction motors; Mathematical analysis; Mathematical model; Performance analysis; Synchronous motors; Torque;
Journal_Title :
Education, IEEE Transactions on