A COMBINED FINITE ELEMENT-STATE SPACE MODELING ENVIRONMENT FOR INDUCTION-MOTORS IN THE ABC FRAME OF REFERENCE - THE BLOCKED-ROTOR AND SINUSOIDALLY ENERGIZED LOAD CONDITIONS

This paper is the second in a set of two companion papers which detail induction motor performance computation and prediction, using a combined finite element-state space (CFE-SS) modeling environment, in which the natural stator and rotor winding flux linkages, currents and voltages are the key variables. In this paper, the CFE-SS modeling environment is used to predict the performance of a 1.2-hp, 3-phase case-study squirrel-cage induction motor under blocked-rotor and typical load operating conditions. The nature of this CFE-SS environment allows one to rigorously account for the impact of space harmonics generated by the magnetic circuit, winding and cage geometric, as well as layout peculiarities, and magnetic saturation, on the current and torque profiles, ohmic losses in the stator armature and cage. This includes the ability to predict the profiles of connector and bar currents. The results of the CFE-SS simulations compare very favorably with blocked-rotor and load experimental test data. Potential capabilities of this CFE-SS modeling environment, and its use in impacting motor design decisions, are discussed in light of the reported findings.