Electromagnetic torque ripple calculation of an IM under non-harmonic supply

The presented paper deals with the calculation of the electromagnetic torque ripple waveform of an induction machine (IM) in steady state. The motor is supplied by non-harmonic voltages from semiconductor inverter. Mathematical model of the inverter is built on the base of complex Fourier series. Based on the mathematical formulas across the terminal inverter voltages a voltage spatial phasor is derived. Using voltage spatial phasor and equivalent circuit of the induction motor the spatial phasors stator and rotor currents are calculated. By the means of motor current waveforms the electromagnetic torque ripple waveform is investigated.