I think you are assuming that if you would put same waveform of voltage/current, you would of got almost double more torque from the other motor. I dont think thats can be the case, because you would need a different law for conservation of energy. Lets keep in mind we talk about same technology, same construction even same form factor, same parameters and no corner cases. If some datasheet says you get @1A the same power you get with another motor @2A, well i suspect that is more marketing than engineering. Or maybe some methodology difference. The flux depends on current. There may be some differences with geometry, materials permittivity, choice of other mats like magnets, but we look past that. Those may count for some, but not so fundamental as double the output. What you get is ultimately what you put in (settings) * some efficiency, and the efficiency part doesnt double without some radical change.
I suspect that its not just you who gets low power from their motors - i would say its everybody. For a 12v&1a setting we start with an ideal 12w if it would be dc, except its not, lots of rise and falls and off times. Also the stepper tech is much worse in efficiency than dc motor - e.g. why steppers dissipate so much heat etc, so while its hard to advance a number for output because its a dynamical parameter, its safe to say its much much lower than the original 12w. So we are talking about just a couple of watts in mechanical domain, its certainly not impressive.
What is different in your case is the bed size, making it almost 40x40cm it means its 4 times heavier than the normal 20x20cm. So the motor needs 4 times more power than the normal printer. I know this first hand because i have this 35*40cm and i run it with nema23/2.5a steppers and my own a3977 drivers which are more powerful and tweakable +double belt mod which increases the power. I thought it would be better, but still just like you, i am still not quite happy with it even in these conditions. It makes quite a noise and its so heavy, plus bed wastes so much heating when printing small parts. It has to be felt in practice to understand all that, although as a concept was initially quite attractive. From this construction i learned that for the best speed and acc settings axes should minimal weight and equal weight (x=y), and only the heaviest matters in acc and speed limitations. Only now i see the benefits to have the x+y together like how is ultimaker and now i understand why makerbot copied that construction after their initial printer which had separate x and y. If i make myself a next one, will be more or less like that, x+y together.
I suspect that its not just you who gets low power from their motors - i would say its everybody. For a 12v&1a setting we start with an ideal 12w if it would be dc, except its not, lots of rise and falls and off times. Also the stepper tech is much worse in efficiency than dc motor - e.g. why steppers dissipate so much heat etc, so while its hard to advance a number for output because its a dynamical parameter, its safe to say its much much lower than the original 12w. So we are talking about just a couple of watts in mechanical domain, its certainly not impressive.
What is different in your case is the bed size, making it almost 40x40cm it means its 4 times heavier than the normal 20x20cm. So the motor needs 4 times more power than the normal printer. I know this first hand because i have this 35*40cm and i run it with nema23/2.5a steppers and my own a3977 drivers which are more powerful and tweakable +double belt mod which increases the power. I thought it would be better, but still just like you, i am still not quite happy with it even in these conditions. It makes quite a noise and its so heavy, plus bed wastes so much heating when printing small parts. It has to be felt in practice to understand all that, although as a concept was initially quite attractive. From this construction i learned that for the best speed and acc settings axes should minimal weight and equal weight (x=y), and only the heaviest matters in acc and speed limitations. Only now i see the benefits to have the x+y together like how is ultimaker and now i understand why makerbot copied that construction after their initial printer which had separate x and y. If i make myself a next one, will be more or less like that, x+y together.