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Anyone?? The manual says preferably 5mH minimum, and in series the motors are 6.8mH. I'm guessing they'd be OK in series, but maybe not parallel, as the parallel inductance is 1.7mH.
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I have some PacSci Powermax II steppers, 253 oz-in torque, 4.6 amps, 1.75V. They're labeled 65V Max.
The question is, how long would they last if run on a Parker Compumotor S6 drive at 170 volts? Would they be better wired series at 2.3 amps and 3.5 volts?
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Anyone?? The manual says preferably 5mH minimum, and in series the motors are 6.8mH. I'm guessing they'd be OK in series, but maybe not parallel, as the parallel inductance is 1.7mH.
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
The formula is 32 times the square root of motor inductance, and most people run bipolor parallel for best performance.
Marriss's cool drive will change this but I don't know when it will be released.
Amplexus Ender
I just ran the numbers and either series or parallel you are way over voltage
series 83v max
parallel 42 v
I think they will fry.
amplexus
I know what Mariss formula is, but these drives have internal 170VDC power supplies. They say they will work with 5mH motors. A bit more reading says they are designed for series wiring. They say that motors may overheat when wired parallel, so temerature testing is required, I'm pretty sure that parallel wiring would kill them. If I get these drives, I may need to get some higher inductance motors for them. Or I may just get a G540. And new motors. Not sure yet. Thanks.
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
I think parallel will kill them for sure and series is twice as much as most moters will handle, if they don't melt you can cook on them.
amplexus
They do have auto current reduction after 1 second with no steps, so perhaps that keeps the heat down? You can set it to 25%, 50%, or 75%.
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Hook the up run them under load and see how much current they actually draw. Maybe the drive has some sort of current limit? Recirculate mode will keep them cool when they are not running but what if they are running for an extended period?
I don't have the drives. I can pick some up for cheap, though. I'll probably pass on them.
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
In that case buy a gecko 540 and avoid the hassle or build Mariss' new 5 microstep drive from the cpld tutorial if cost is an issue.
The motors are rated a 65V. That should be a significant clue.
Mariss
Originally Posted by Mariss Freimanis
Gerry
Mach3 2010 Screenset
http://home.comcast.net/~cncwoodworker/2010.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
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