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General Mach Discussion / Re: Noobish Question On Motors & Drivers
« on: April 30, 2008, 10:01:06 AM »
Yes but from a quick squint at it they are not comparing like for like. I may be wrong as I am in the middle of working on a boats engine at the moment and dont have time to thoroughly read it. What I am seeing is they are comparing the wattage of these motors and not the torque. Also I dont know how they get the servo as having its peak torque at 3000RPM as I cant see any diagrams or charts, maybe they just arent loading because I use Opera. As can be seen by the above chart I posted my motor actually drops off slightly at higher revs and below is another to support my case, this is a motor I have on the lathes X Axis. Also I have attached a quote from the Rockwell Automation manual for the motor
What I can say for sure is you need to size the motor to your application and no matter whether its a stepper or a servo if you undersize you will get bad results. If you get the size right you will have a good system, just with different characteristics. Oh and just to show I am not Anti Stepper I have just made a coil winding machine for a customer. Money was not a problem with this build in as far as hardware was concerned but there was no way I was going to spec servos for it. Plain and simple reason was they were not needed so would have been a waste of money, the steppers are more than fast enough and as has been said if sized properly then accuracy is not an issue either.
Hood
What I can say for sure is you need to size the motor to your application and no matter whether its a stepper or a servo if you undersize you will get bad results. If you get the size right you will have a good system, just with different characteristics. Oh and just to show I am not Anti Stepper I have just made a coil winding machine for a customer. Money was not a problem with this build in as far as hardware was concerned but there was no way I was going to spec servos for it. Plain and simple reason was they were not needed so would have been a waste of money, the steppers are more than fast enough and as has been said if sized properly then accuracy is not an issue either.
Hood