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 Posted - October 10 2012 : 6:15:51 PM
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Is it possible to replace the missing magnet from a non working MU2 motor into a formerly working MU2 motor without a magnet.
Would you drill out the rivet the use a small bolt to replace it.
I'm sure you must make sure the magnet is replaced in the same direction.
Any help welcome.
Alco Fan
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Posted - October 10 2012 : 11:10:09 PM
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You would need to put a steel keeper across the top of the good magnet & pole pieces and lift them off the motor block as a unit and get them onto the new one without breaking the magnetic field. I don't think you can do you that because of the way the pole pieces lock onto the block. You'd have to spread them, and that would break the circuit and lose most of the magnetism.
The better solution is to use a stack of neodymium magnets in place of the bad one, which will make it run better than new anyway.
http://www.tycoforums.com/tyco/forum/topic.asp?TOPIC_ID=12192
The Tyco Depot
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Posted - October 11 2012 : 07:28:25 AM
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Thanks Nelson. I do remember the part about breaking the magnet field from another post. I was also thinking that when we used to clean the motors on our HO Aurora slot cars the magnets would come out and you'd just put them back in the correct order so the wouldn't run backwards, and they worked.
This might explain why my Diecast FR16 will not run.
1. How do the neodymium magnets recreate the field? 2. Does it have to do with the N S orientation? 3. Will the neodymium magnets make this MU2 run faster than another it is lashed- up to?
Can I make another appointment with your secretary? :)
Alco Fan
Edited by - Alco Fan on October 11 2012 08:10:05 AM
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Posted - October 11 2012 : 8:12:33 PM
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the neodymium magnets are true PERMANENT magnets, the one in the MU-2 is not. The neo's won't lose their charge unless you stack them wrong for a good while. Which would be hard to do, as they'll try to flip to N/S orientation anyway. I've done this swap in a Tyco Hustler that I mistakenly flipped the magnets the wrong way when I reinstalled them, and it caused the windings to get real hot, and didn't run fast. I toasted the magnetic charge. When I installed the neo's, that lil bugger REALLY hauls now! Just drill out the rivets and replace with a #4 long screw and nut, and you'll be all set.
Jerry
" When life throws you bananas...it's easy to slip up"
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Posted - October 12 2012 : 12:23:39 AM
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The only thing the N/S orientation of the magnet determines is the direction the motor will spin and the loco will travel. You have a 50/50 chance of being right when you put the new magnet in. If it runs in reverse, just flip the magnet(s) around. You can use a directional compass to mark the direction of the magnet before installing the new one if you want.
Neodymiums are extremely strong magnets, and their field is carried by the steel pieces that surround the armature just like the original alnico magnets. Alnicos weren't very strong, that's why manufacturers gave the assembled motor an extra charge of magnetism, but it's lost when it's taken apart. Aurora slot cars had molded ceramic magnets (like you find in can motors) that are stronger and don't need charging, but they aren't nearly as strong as these new rare earth magnets.
Your loco will actually run slower and stronger with a magnet replacement. Motors with weakened magnets spin very fast but have very little torque; too weak and they won't spin at all.
I heard from a friend that those old diecast Sharks had weak magnets. I know Darth Santa Fe did a magnet replacement on his.
Oh, and no secretary, just voicemail. 
The Tyco Depot
Edited by - NickelPlate759 on October 12 2012 3:23:27 PM
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Posted - October 12 2012 : 05:55:43 AM
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Thank you gents. I'm learning and I'm headed to radio shack to see if I'll have any luck. I think I'll replace two magnets so I can lash them together.
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Posted - October 13 2012 : 6:38:50 PM
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I found that a 1/2" neodymium cube is a great fit for these motors. The strength of the magnet alone will hold the magnetic field plates in place pretty well, and a touch of glue will finish the job. One thing to remember is if your motor truck mounting bracket is the old steel plate type, you'll have to replace it with the plastic type. The new magnets are so strong that they'll stick to the steel plate and twist the truck off the track!
Darth Santa Fe, doing weird and challenging projects for the fun of it!
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