marvinbeaverdip

iTrader: (36)

Hello, I'm wondering what the theory is behind wrapping the rotor in kevlar? One of my motors (old) has bad bearings and when taking it apart noticed that the wrap on the rotor is f'd up.. So I took it out and took the rest of it off. The rotor core appears to be a solid magnet, nothing that needs to be "held together". Is this a safety thing? or do some rotors have multiple magnets making up the core and need this wrap to keep them together?

Duster_360

iTrader: (21)

You can count on the fact they didn't go to the trouble of wrapping the rotor for no reason.

I think the kevlar is there to help withstand the centrifugal force generated at high rpm.

marvinbeaverdip

iTrader: (36)

true, but some rotors are not wrapped at all, so it must be more dependent on the type of magnet. I'm wondering if it's more an issue of damage control. If a rotor is going to break apart, I'm guessing the small amount of kevlar wrap I found isn't going to keep it together, it'll just keep chunks from getting wedged in the windings and causing immediate ruin. At this point in this old motors life, I think I'll take that risk, unless it's simple to re-wrap it.

racer1812

iTrader: (31)

Which brand of motor? Just for my curiosity.

marvinbeaverdip

iTrader: (36)

Novak Velociti 6.5r

Dave H

Wonder if this is an older bonded rotor motor? None of mine appear to have anything like that, but they are the sintered rotor ones.

Pictures?

racer1812

iTrader: (31)

I thought the old EX series were the only Novaks with bonded rotors? Wouldn't think a Velociti would have one especially the later "R" model...

Never seen a rotor with anything on it..

krone6

iTrader: (2)

Same. I always just see the basic metal outsides and inside a big magnet with bearings and copper... Never knew motors were wrapped in anything.

Dave H

Don't disagree, I thought the same as you guys, but I'm certainly not positive. Why I phrased it as a question, just wondering.

marvinbeaverdip

iTrader: (36)

I'll take a picture of it later tonight. The novak website describes the rotor as a "High-performance Nickel-plated sintered Neodymium rotor", but this thing doesn't look nickel plated.

krone6

iTrader: (2)

Sounds expensive.