The effect of link current ripple on the torque pulsations in a current source inverter-fed induction motor

This paper analyses the effect of link current ripple on the torque pulsations of a current source inverter-fed induction motor. The torque pulsations produced by a ‘pure’ DC link current are compared with those produced by a link current containing both DC and a superimposed ripple. It shows that if the average values of link current in the two cases are the same, the magnitudes of the torque pulsations with and without ripple are approximately equal in the time domain, although the magnitudes of the individual torque harmonics are affected. It also investigates the effects of different inverter frequencies on the torque pulsations.