This isn't a homework question because nobody assigned it to me. It is a theoretical question however. I understand that in a balanced 3-phase system with a constant load, instantaneous power is constant. Not "pretty constant" but a flat line. This suggests to me (warning: amateur) that instantaneous torque, in a 3-phase induction motor, might also be constant throughout each revolution, assuming a fixed load. But, given that slip is necessary, and that the rotor experiences a frequency of a few hertz, it may be hopelessly naive to imagine that torque isn't somewhat "bumpy." Again - this is instantaneous torque I'm thinking of, measured throughout a machine cycle or two, not torque vs. load or any of that usual motory spec stuff. ;-) I've exhausted the books I have at hand, and I feel as though I've seen every torque curve on the internet by now. Perhaps it's not an important question but it's burning a hole in my curiosity.