number of poles on a 3phase motor?

[Black Forest]

I need to set up the VFD for my mill project. There is no name plate on the motor. The VFD wants to know how many poles the motor has on it. How can I determine how many poles the motor has on it? I attach the open connection box on top of the motor.

[Black Forest]

This motor has a 220v brake on the rear end of it. That is what those extra wires are for on the motor.

[jwmelvin]

What's the base speed of the motor? ~3400 rpm = 2-pole; ~1700 rpm = 4-pole

[Doozer]

How many Pollaks does it take to wire a motor ? ? ?
Is that what you mean ? ? ?

-D

[J Tiers]

What's the base speed of the motor? ~3400 rpm = 2-pole; ~1700 rpm = 4-pole

Or, in BF's case, 3000 and 1500 rpm, as he has 50 Hz

[skunkworks]

Or, in BF's case, 3000 and 1500 rpm, as he has 50 Hz

Umm - we use American RPM on this forum....

[RB211]

I prefer to have my RPM's in Bald Eagles per Beers

[J Tiers]

Umm - we use American RPM on this forum....

Do you now......?

How interesting..... since BF just happens to be in a place you may have heard of, called Germany. it's in europe, where they don;t do things the same way...............

[Doozer]

But he is from the land of beers and steers.

-D

[old mart]

Hopefully there should be a motor plate. 2 pole 3000rpm, 4 pole 1500rpm, 6 pole 1000rpm 8 pole 750rpm , approximate figures @50 hz. Without the plate, you could switch it on and check the rpm with a digital counter, or somebody will know what the field windings look like.
Take no notice of boasts about mains frequency, just ask them how heavy a ton is or how big a gallon is.

[djc]

I think the only reason the VFD wants to know is so that when it displays the motor rpm, it does so correctly. It does not put anything different down the wires to the motor whatever pole value you give it. So guess if you have to, run the motor at 50Hz, measure the actual rpms and see if they agree with the display on the VFD.

[Noitoen]

More important than the poles as the VFD does't care except to show the correct speed on the display, that motor has a dc brake powered by the same lines as the motor. To run on the VFD you need an external relay with permanent supply to power the brake controlled by one of the VFD's control relays (most have 2) with the external brake parameter activated. Most will ask at which output frequency should the brake be released/engaged.

[J Tiers]

But he is from the land of beers and steers.

-D

Yabbut, he left.... Traitor!

[Black Forest]

More important than the poles as the VFD does't care except to show the correct speed on the display, that motor has a dc brake powered by the same lines as the motor. To run on the VFD you need an external relay with permanent supply to power the brake controlled by one of the VFD's control relays (most have 2) with the external brake parameter activated. Most will ask at which output frequency should the brake be released/engaged.

The brake for the motor is 220v AC. I was going to have the CNC controller release the brake whenever the spindle is turned on. The Centroid Acorn has a provision to do this.

The motor is 1500 rpm.

[Noitoen]

1500=4 poles