Servos, a quick question

Hello listies,

I was having a look on the internet at servos to see how much they'd be instead of steppers around the 100 - 150 oz/in range. I found Magmotor http://www.magmotor.com/catalog/c38/index.html and even though I'm not overly interested in buying servos from them I was wondering about them. If you look down to the C38-200 it says it will deliver 1 30oz/in constant torque and 700 at it's peak. But it's amperage at constant torque is 6.7, is that general of servos? That they need comparably a lot more amperage than steppers? I remember seeing that this sort of stepper would only take 2amps. Do servos use a lower voltage and a higher amperage? At peak, if I was running a four axis machine with those motors, I would have to be supplying 160amps of controlled power. 26.8 amps constant, doesn't that make the control quite expensive? These are two pole servos, are 4 poles smoother running like 3 phase power compared to single?

Thanks,
John


[Non-text portions of this message have been removed]