This diploma thesis presents a systematic design, modelling, and analysis of three-phase induction motors with a squirrel cage on the rotor side, intended for use in various industrial applications, such as automotive, chemical, pharmaceutical etc.
The first part presents the software tool based on finite element method (FEMM) which has been upgraded to facilitate the design, construction, and analysis of three phase inductions motors with a squirrel cage on the rotor side. The FEMM program has been upgraded with the software Scilab, while the graphic user interface has been developed using the Microsoft Visual Basic environment. The resulting software tool enables design and analysis of induction machines based on the required input data such as geometrical, electromagnetic, material, and other properties. The software returns the calculated equivalent circuit parameters based on which the output characteristics of the modelled motor can be calculated (i.e., torque characteristic, efficiency etc.)
The main objective was to design the three-phase induction motors of nominal powers 3 kW, 15 kW and 22 kW, based on the input stator and rotor geometry, the basic characteristics of the individual motor segments, the selection of the appropriate winding scheme and winding characteristics, and finally, the use of methods such as rotor skewing to reduce the parasitic effects such as torque pulsations. First, the numerical models of induction motors with the nominal powers 3 kW and 22kW have been built and validated with the experimental measurements performed on the industrial induction motors with the same power, produced in the company Bartec Varnost d. o. o. Based on the validated numerical modelling approach the numerical models with the nominal power of 15 kW, intended for automotive industrial applications, have been developed and analysed.
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