replacing ferrite magnets with Neodimium what are the gains?

[cmulder]

I have a few ball bearing brushed motors that i think of to upgrade to Neodimium magnets.
One is for example a speed 480 bb race and a speed 480l (reverse)
WHat performance gain can i espect from stronger magnets?

[falito]

Hi

You can take more torque.

[Bruce Abbott]

Torque increases and rpm decreases accordingly, so you can swing a larger prop at the same voltage and current. The stronger magnetic field may cause higher iron losses. However, even if motor efficiency is not improved, it should be able to deliver more power.

For example, I replaced the stock magnet in a CDROM motor with Neodyms. It drew the same current with a 25% larger prop (at 25% lower rpm) and efficiency went up 4%. Flight performance was noticeably improved.

I haven't yet tried putting Neodyms in a brushed motor, as I don't know where to get magnets of the correct shape.

[clausxpf]

Right size.....
You might have to make a back up iron ring of the right size, as done in CD motors/LRK motors, and cascade the magnet.the the standard things will work fine for you.
Claus

[The Tellurian]

I've replaced ferrites in can motors with great success. Don't be fooled by the Kv as it will go way down so you must go to a larger prop. It will swing slower with a reduced pitch speed but the thrust on mine increased nearly 50%. If you need the same prop size the motor will need to be rewound to a lower number of turns per tooth to raise the Kv.

Richard