Modeling inverter-fed three-phase squirrel-cage induction machines including spatial and temporal harmonics

This paper presents a simulation model for voltage-fed 3-phase, unskewed, cage-rotor induction machines. The model includes the effects of machine harmonics due to winding distribution, slotting and saturation. The model demonstrates the influence of various harmonic quantities in the machine and calculates respective electrical and magnetic quantities like currents, flux linkages, magnetic field strength, torque and airgap force. It is an analytical model based on the 2-D machine geometry and material parameters. The model does not require simulated Finite Element Method (FEM) data. It is purposed to be used in ordinary differential equations environment models like Matlab Simulink. The model is validated by comparing simulated and measured stator currents and torque at different operating points. Additionally, stator and rotor currents, as well as torque and the magnetic flux density in the air-gap are compared with FEM simulations.