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Old 10-24-2009, 05:28 PM   #1
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Default Are there Rare earth magnets fit for 540motor?

I saw on youtube this guy using rare earth magnets to up the motors rpms by triple triple what it was,so a 40k rpm motor would do 120k rpms.just wanted to know if anyone knew of any fit for 540 motors.ive considered cost and heating to the armature,i have plenty and i dont mind buying low cost motors and winding them myself.I just want a motor for racing gas cars in the winter when its freezing out,
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Old 10-24-2009, 05:47 PM   #2
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The vast majority (if not all) 540 armatures (or brushless rotors) won't handle that RPM. They will self destruct, and it won't be pretty.
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Old 10-24-2009, 05:47 PM   #3
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Post a link please.
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Old 10-24-2009, 07:00 PM   #4
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well i couldn't find the original video ,but i found this one but its a little motor,i would assume that its the same principle,i didnt think the armature blowin apart,im not looking to have the motor just to drive it around for 15 minutes,more like a spur of the moment race against a gas car ya know.my tc3 can have a motor swap in minutes so i dont mind




http://video.google.com/videoplay?do...7714068564644#
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Old 10-24-2009, 07:13 PM   #5
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Just get a low turn modified or low turn brushless motor, gear it correctly, and you'll have no problem keeping up with nitro cars. You don't need to mess with special magnets and hand winding armatures. For more fun, try a 3s LiPo battery.
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Old 10-24-2009, 07:18 PM   #6
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three words.. mamba max pro

get the mamba max pro and mamba 5700 and put that bad boy on 6s and hold on~~`
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Old 10-24-2009, 07:21 PM   #7
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I have a duratrax streak esc and it only handles modified 12t and up,i dont wanna buy another esc or motor,im already kicking gas car ass i just wanted to do i little boost for little cost ,and hand winding ive always wanted to do,i really dont mind messing with things like that
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Old 10-24-2009, 07:25 PM   #8
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when the windings go lowerr the wire guage increases.. also if you could mod the magnets you really think it wouldnt draw more current.. if you awnser no to that. think again..

not to mention to wind your own motors you need silver solder otherwise it will throw a winding within ten seconds.


you really cant beat the price of the mamba max pro.. look it up
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Old 10-24-2009, 07:32 PM   #9
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I have the tools and the epoxy for it,plus it came with tabs anyway,i wanted to hook it up like the ruby 16t triple by trinity,i guess it would draw more current,i was planning on using 24 awg,or 23.i dont mind battery life either,its just for quick races the motor
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Old 10-24-2009, 08:15 PM   #10
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If I remember correctly, rare earth magnets lose their magnetism in the 170 degree range. The motors commonly used now use ceramic magnets whose Curie point is in the 800 degree range.
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Old 10-24-2009, 08:20 PM   #11
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I guess i can just place the magnets on top of the motor can to make it simpler,idk ill try an experiment when i get hold of some....

The magnetic field typically produced by rare-earth magnets can be in excess of 1.4 tesla, whereas ferrite or ceramic magnets typically exhibit fields of 0.5 to 1 tesla but their Curie temperatures are below room temperature, so in pure form their magnetism only appears at low temperatures. However, they form compounds with the transition metals such as iron, nickel, and cobalt, and some of these have Curie temperatures well above room temperature. Rare earth magnets are made from these compounds.Rare earth magnets are extremely brittle and also vulnerable to corrosion, so they are usually plated or coated to protect them from breaking and chipping.

Magnets......................Br (T)........Hci (kA/m)...(BH)max(k/m3).........Tc(C)
Nd2Fe14B (sintered).....1.0–1.4.......750–2000.......200–44 0..............310–400
Nd2Fe14B (bonded).....0.6–0.7.......600–1200.......60–100.. ...............310–400
SmCo5 (sintered)........0.8–1.1.......600–2000.......120 –200................720
Sm(Co,Fe,Cu,Zr)7(sintered)0.9–1.15..450–1300.....1 50–240...............800
Alnico (sintered).......... 0.6–1.4............275........10–88............... ...700–860
Sr-ferrite (sintered).......0.2–0.4.......100–300.......10–40 ..................450

wikipedia: http://en.wikipedia.org/wiki/Rare-earth_magnet
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Old 10-30-2009, 07:05 PM   #12
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http://www.youtube.com/watch?v=UkKk7qSaKJY of a kid showing off his 540 motor.



Motor dimensions:
Motor Size:540 Size:+/- 2.26"length X 1.42Diameter(57.5 x 36 mm)(can and end bell)
Can Length:2.1"(53mm)
Motor Magnet:12.3 mm
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