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 Posted - September 28 2013 : 6:41:18 PM
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I remember seeing somewhere an article where a modeler had replaced the permanent magnet in a DC (Mantua) motor with a stack of rare earth magnets. Did any body else see this, and maybe even try it? How did it work? I have an old Mantua motor laying around here, and I would like to experiment with it.
RBNicholson
RBNicholson
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Posted - September 28 2013 : 6:49:22 PM
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RB,
You get any sales flyers from Micro-Mark? That's where they were talking about and where they came from.....
Micro-Mark Catalog number: #84991, Pack of 20, $29.95.
have no connection with them, but they are a good product, as far as I can tell for the old Mantua/TYCO open frames they work WELL, I have yet to try them on anything else!
~John
Many have tried to, and failed, ya just can't repair stupid... 
Do NOT try to Idiot-Proof anything!!!! God, will simply create a better......IDIOT!
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Posted - September 28 2013 : 7:30:33 PM
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A couple of useful links:
http://www.tycoforums.com/tyco/forum/topic.asp?TOPIC_ID=12192
http://webspace.webring.com/people/ib/budb3/arts/motor/manpm1nmag.html‎
-Thomas
Edited by - Redwoods on September 28 2013 7:31:32 PM
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Posted - September 28 2013 : 7:30:55 PM
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quote:RB,
You get any sales flyers from Micro-Mark? That's where they were talking about and where they came from.....
Micro-Mark Catalog number: #84991, Pack of 20, $29.95.
have no connection with them, but they are a good product, as far as I can tell for the old Mantua/TYCO open frames they work WELL, I have yet to try them on anything else!
Originally posted by EM-1Â -Â September 28 2013Â :Â 6:49:22 PM
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Thanks, EM,
I just received an order from MicroMark a couple of days ago. Thry included a catalog. I'll have to check it out.
RBNicholson
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Posted - September 28 2013 : 7:37:31 PM
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I did it to a Mantua motor I think, and it runs like stink! ( ie, GOOD ). I bought the magnets at a Service-Star hardware store, they stocked all kinds of rare earth magnets from 7 small ones ( which is what I bought, I used 4 or 5 stacked ) to larger ones. About $7 total for the 7 magnets. It's worth doing, in my opinion, if you have a destroyed magnet , Alnico type like was used back then. It'll definitely make a difference!
Jerry
" When life throws you bananas...it's easy to slip up"
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Posted - September 28 2013 : 7:52:03 PM
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RB,
Your welcome! Those are about the best I have found so far!
I have to say, I have done the same thing AMC mentioned at the local hardware store, and they did "OK" at best, but he Micro-Mark ones do VERY well. I had to bite my lip pretty hard for the 30 bucks plus shipping (along with some other things from the catalog) but they are a stronger magnet set then whats at the local hardware stores, I have found, and yes, stacked as well!
I just don't know if the new magnets are good enough to hitch up DCC to the same motor.....
~John
Many have tried to, and failed, ya just can't repair stupid...
Do NOT try to Idiot-Proof anything!!!! God, will simply create a better......IDIOT!
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Posted - September 28 2013 : 10:37:02 PM
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I have upgraded several locomotives with neodymium magnets. The source I used was K&J magnetics. They have a big variety of types. Find them at www.kjmagnetics.com.
Their magnets are rated N42 or N52 with N52 being a stronger field. For small Mantua motors like the ones in the Prarie, Big Six, Shifter, etc., a stack of magnets 1/2" high by 1/2" wide by 1/4" gives plenty of torque in the smaller locomotives. I have successfully used magnets B842, B842-N52, and B844 for this.
I also had the same motor in a Mantua Mikado and wanted a bit more torque and had a bit more room. B888-2PA-N52 which is a 1/2" cube with a hole through it in the direction of polarization. The motor was the one with a screw through the magnet. The riveted ones won't work with the big cube magnet. This motor ran a bit loud, since the armature of the motor enters and leaves a powerful magnetic field with a bit of a snap. When running, it makes kind of a whine.
I've also upgraded a Bowser DC71 motor with a 5/8" cube magnet. This has lots of torque, but runs pretty loudly. I had an MDC boxcab diesel with a bad magnet and replaced the magnet in it so that a non-runner became a decent runner.
Watch that you get the magnets oriented with the poles the same as on the original magnet or the motor will run backwards compared to how it did originally. If you stack magnets, they'll refuse to stack with one the wrong direction. Two stacks side by side have to be polarized the same way for the motor to work. Outside the motor, they'll want to flip around in opposite directions, but they'll cooperate once you get them into the motor frame.
If silent running is your priority, this is not for you, but if you just want to improve torque or low-speed control and can tolerate a little motor whine, it's the best thing since sliced bread.
Carpe Manana!
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