Question about electro-magnetic motors

Printable View

03-24-2009, 07:40 PM
black roadster

1 Attachment(s)

Question about electro-magnetic motors

I just restored a vintage box fan for my wife.

In doing so I disassembled the electro-magnetic motor, cleaned it out with brake cleaner, electric contact cleaner, let it dry and then greased the moving parts with dielectric grease.

Finally I rewired the switch and plug.

The fans runs smoothly but also runs backwards. :confused: There is very little air coming out. I though I might have reversed my contacts. As a quick fix, I just flipped the non-polarized plug in the socket but that didn't do anything.

Any ideas?

Here is a schematic of whats going on.
03-24-2009, 07:51 PM
onething

The polarization of the magnetic field will determine the direction of rotation.

Fleming's left hand rule linkie
03-24-2009, 08:26 PM
cone-cerned

Turn the fan around. ;-)
03-24-2009, 08:41 PM
sammm

Quote:

Originally Posted by cone-cerned

Turn the fan around. ;-)

Or stand on the other side of it. :rolleyes:
03-24-2009, 08:45 PM
Nails

Flipping the plug won't matter with AC. You somehow changed the polarization of the motor. Did you remove and clean magnets?
03-24-2009, 09:23 PM
black roadster

Quote:

Originally Posted by Nails

Flipping the plug won't matter with AC. You somehow changed the polarization of the motor. Did you remove and clean magnets?

I removed the rotor but the magnets stayed in place. I may have assembled it sdrawkcab. ::Censor::