Finding Positive

[sublime21]

Hey,

Just trying to find the positive connection from a turbine. I have the multimeter here.

Seems like it spins clock wise, any tricks to finding which wire should be the positive? I think the black is. It came up in negative polarity when it was spinning the other day. So I turned the black to red. Motor can do current either direction.

Thanks

Cheers

Sublime21

[ghurd]

"a turbine"?

Brushed PM DC motor?

Single phase?

Three phase?

DC?  Rectified DC?  Raw AC?

"can do current either direction"?

They all do.

Guessing this is a brushed DC PM treadmill motor.

The positive depends on the direction of rotation.

You need to read detailed information on building and wiring Ametek or treadmill motor windmills.

G-

[Flux]

Just use use the meter and trust it.

It is a dc motor and if you want to sort it without a meter just connect it to a battery. If it spins in the right direction for the prop then it is correct. If it spins the prop backwards swap the leads.

You will need a blocking diode to stop it motoring and it will be connected correctly to charge when the prop drives it above cut in speed .

Flux

[sublime21]

Thanks Flux for the insight