| Gallery, Projects and General > Project Logs |
| CNC router table... |
| << < (4/10) > >> |
| vtsteam:
Sounds very good. That's not so far from the usual 200. I'm sure the torque must be be high, and I bet electrical efficiency is good, too. |
| vtsteam:
John have you settled on a max current yet? That's the most critical figure for a stepper motor. Too high and it kills the magnets, so there's always a definite figure in the motor rating. Voltage supply to the driver, on the other hand is frequently much more than the original stepper motor rating in order to increase speed. But the driver always keeps the current at or below spec. |
| John Hill:
Hi Steve, You say too much current kills the magnets, is that due to heating? I have not yet tried to play with the current , I think it is set for 4 amps right now, the coils are 0.6mm, in one motor the coils are series parallel so only 2 amps for them. Or is damage done by excessive field strength scrambling the magnets? These are ferrite magnets but there are folks who have converted them to neo magnets to get more output when used as wind generators. I have a few spares on hand! :med: I posted a question at http://www.linuxcnc.org/index.php/english/forum/16-stepconf-wizard/28763-stepconf-question-from-a-newbie where 'Andy' is going to great pains to assure me this is not a stepper motor! Ha ha, I dont think that is the spirit of MadModders! :lol: One of the relics in my shed is a pedal generator I made years ago using one of these motors. The F@P motor of course is really too big for human scale operation so I took my saw and removed 24 stator coils leaving just 18! It worked well for the pedal generator producing 100watts at average human input from the attached exercise bicycle. This also works well as a stepper, it has a much higher maximum speed than the unmodified motors and still produces useful torque. |
| vtsteam:
John, I think it's the heating, so it should be possible to gradually work out what "feels" right. I think when they're just holding they put out as much heat as running. I have a few stepper motors that seem to run pretty hot, but seem to be within nameplate spec. I also think mounting them on metal probably acts as a heat sink somewhat, and the ones I have that run hot are mounted on plywood. It's been a few years, and they seem to still run as strong as they did. But I don't us them often. |
| vtsteam:
--- Quote from: John Hill on January 12, 2015, 03:19:30 PM ---I posted a question at http://www.linuxcnc.org/index.php/english/forum/16-stepconf-wizard/28763-stepconf-question-from-a-newbie where 'Andy' is going to great pains to assure me this is not a stepper motor! Ha ha, I dont think that is the spirit of MadModders! :lol: --- End quote --- Where's their spirit of adventure? :nrocks: |
| Navigation |
| Message Index |
| Next page |
| Previous page |