A Design Method for Double Cage Rotor Considering Speed-Torque Characteristic Optimization in Induction Machines

摘要

In this paper a method for the designing of a double cage rotor (DCR) for three-phase induction motors (IMs) is developed. For the complete dimensioning of the both cages’ slots and the slit between these formulas were leaded out. The influence of these dimensions on the starting current, starting torque and breakdown torque ratios and on the rated slip was analyzed in detail. The developed method was tested by designing of a three-phase induction motor (IM) with DCR for the rated power 5.5 kW by constant supply frequency 400 Hz, the obtained results were verified with the evaluation of motor characteristics from a 2D Finite Element Method (FEM) motor’s model. The designed DCR core sheet was compared with DCR core sheets used in industry by designing of an IM with the same stator and air gap. The obtained with the designed DCR results show much higher starting torque and breakdown torque ratios than the results obtained by using of industrial sheets.