Joined: 16 Jun 2004
Posts: 3110
Location: Castle Hill, Sydney. N.S.W
in regards to brushless motors etc etc
Orbit ran flawlessly with is this event, the only issue was in the bender match where it wouldnt start which later was discovered to be one of the motor wires disconnected from the connector, i re-soldered it and it worked fine for the demo and bouncing Tims 5kg robot off 3 walls
In short i know some people are still very hesitant but i had no issues with my setup _________________ Andrew Welch, Team Unconventional Robotics
Mon Jan 19, 2009 11:07 am
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
yersh demon would have gone well i think had the belt tension been less but still a bit wierd that the motor demagnetised itself. in any case time for series wound goodness _________________ www.demon50s.com - Minimoto parts
http://www.youtube.com/user/HyzerGlen - Videoooozzz
Mon Jan 19, 2009 11:10 am
DumHed Experienced Roboteer
Joined: 29 Jun 2004
Posts: 1219
Location: Sydney
NIB magnets are only good up to 80° or so from memory. _________________ The Engine Whisperer
- fixer of things
Mon Jan 19, 2009 2:17 pm
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
There are various ratings up to 150 deg. C - chances are that the cheaper motors don't use the higher temp magnets.
Mon Jan 19, 2009 2:25 pm
Dylon
Joined: 09 Nov 2006
Posts: 631
Location: Newcastle, NSW
don't know why you all have so many problems with the blue inrunner, its like the only thing that hasn't broken in misfortune lol if only everything else was as reliable hmm _________________ Barton Robotics Youtube Channel:
https://www.youtube.com/user/dyl30
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
Its that fantastic motor mount, no doubt
Mon Jan 19, 2009 4:17 pm
Valen Experienced Roboteer
Joined: 07 Jul 2004
Posts: 4436
Location: Sydney
if it goes over that temp it will loose its magnetism, but it should come back when it cools off again as i recall.
I dunno if the inside of the inrunner is actually nib, i have a sneaking suspicion its actually iron. _________________ Mechanical engineers build weapons, civil engineers build targets
Mon Jan 19, 2009 4:34 pm
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
No, its permanent . I overheated a salvaged hard disk magnet once and afterwards it was totally demagnetised. Apparently they can lose part of their magnetism if they are only heated briefly of only *just* to the threshold temp.
Mon Jan 19, 2009 4:45 pm
seanet1310
Joined: 08 Nov 2006
Posts: 1265
Location: Adelaide
Glens has lost all magnatisum. _________________ Remember to trust me, I am an Engineer.
Joined: 20 Jul 2004
Posts: 2523
Location: Victoria
lol you can just pick up a paper clip with it
All the same im still keen on brushless just need to experiment some more. _________________ Tim Team Reaper.
Mon Jan 19, 2009 10:15 pm
seanet1310
Joined: 08 Nov 2006
Posts: 1265
Location: Adelaide
lol you could probably do more with a fridge magnet however.
Andrew had no problems (solder joint failing has nothing to do with the brushless). _________________ Remember to trust me, I am an Engineer.
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
yeah well heres what happened to all mine
first motor demagnetised. it would never run at full power till you jiggled the throttle back off and on whereas the spare motor did - so i suspect a crapped out winding or few in the first motor to be the problem there.
it overheated so badly it demagnetised the motor and melted all the glue holding the magnet and end caps to the shaft so the shaft also pulled out and smashed into the disk
the spare motor worked good until the front bearing siezed it looks like (havent had much of a look tbh) and in the last fight with black and white the motor worked good until the shaft pulled out again and bent it.
so yeah. if you want to use them you need some ultra efficient transmission setup or youll be burning them out everywhere. back to pmdc with me
Tue Jan 20, 2009 9:09 am
Glen Experienced Roboteer
Joined: 16 Jun 2004
Posts: 9481
Location: Where you least expect
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. I overheated a salvaged hard disk magnet once and afterwards it was totally demagnetised. Apparently they can lose part of their magnetism if they are only heated briefly of only *just* to the threshold temp.
