Maxwell 2D Transient - transient Torque plot fluctuating

Hii,

I am relatively new to the software and During the modelling of a 4 pole 3 phase induction motor, I am getting output transient torque plot as fluctuating as shown in the below link ( not the exact image but it looks similar).

https://www.researchgate.net/figure/...s-one-of-three

Any suggestions will be highly appreciated.

Thanks and Regards