Motor magnets (continued)
This post follows on from two previous discussion threads:
Motor rotor jammed - May27 - Simon Jelley
Magnet replaced - Sept04, 2023 - dampfmaggus
I have a loco where the magnet's nickel coating has come off completely, leaving the magnets loose and therefore jamming the rotor. I need replacement magnets (or a complete new motor). I looked at the two magnets sourced in the above discussions, but neither are ideal.
I checked the First4Magnets website and found this part: NB131002-LMI-10. It is about the correct size: 12.7 x 9.52 x 1.58mm, but is the wrong grade of magnet and won't cope with the temperatures. However, the same company do use a suitable grade, which Simon refers to in his discussion thread above, so I asked for costs to manufacture a batch of magnets. They have come back with the following:
NB131002-N45SH - 12.7 x 9.52 x 1.58mm thick N45SH Neodymium Magnet
100 @ £3.61 - 7-8 week lead time
100 @ £1.54 - 14-16 week lead time
This grade (SH) is capable of 150C, so should be fine in our application.
Thoughts please:
Is this the correct size/grade of magnet ?
Should I buy a batch of magnets ?
Should we consider asking the club shop to buy a batch ?
How many do we need ?
David
I've completed the magnet testing. The new magnets are approximately 15% stronger than the OE Hornby magnets. They provide 15% more torque and therefore rotate 15% slower. They are also perfectly happy up to 150C. All of which is just perfect for our OOLS application.
Now available in the club shop 😉