Electromagnetic model for evaluation of flux harmonics and resulting magnetic forces in induction motors

An electromagnetic field approach for accurate determination of the amplitudes and the frequencies of the harmonic components of the field generated within induction motors and the associated torsional and radial magnetic forces is given. The relative motion of the slotted boundaries as well as the rotor induced current are taken into consideration. A novel approach based on matrix methods is introduced to solve the coupled equations of the harmonic components. Attention has been focused on the process by which the harmonics of the radial and the tangential flux components interact to produce the harmonic forces. Display of the flux and the force harmonic spectra is provided which clearly shows the contribution of each harmonic component to the magnetic forces