Dynamo on a B2150

[kmmontandon]

Is the rotor supposed to spin by hand without much effort?

My dynamo recently seized up, so I decided to just replace all the bearings myself. When I took it off, it wouldn't turn at all. I put it all back together with the new bearings, and now ... the rotor is very hard to spin by hand. I'd never done so before, so I don't know what it's supposed to feel like. I don't want to put it back on and have it seize and burn up the belt.

 

[North Idaho Wolfman]

Yes it should spin and you will feel the pull of the magnets, the spin will be pulses not a free spin.

 

[85Hokie]

As Wolfman said - you will get a bump - then smooth then a bump.

AS you send the armature through the permanent magnet - the attraction will make a friction point then as it moves a bit more the friction will go away.

In simple terms - the friction is an electrical build up !

If you want to - get the appropriate socket - add it to a cordless drill, hook up the leads to a volt-ohm meter with IT SET to AC ....... and spin it fast!!!! You should read something close to 30 volts AC!!!