motor question

[markymark2406]

i have just removed a motor from a hospital plant room im a bit of an idiot on star delta theory and all that the motor has 3 wires only is it a star or delta?

 

[GaryMo]

In what configuration were the solid links in the terminal box?

 

[Jaymack]

There should be a nameplate on it, what are the details. If there are only three wires, are you sure this is a 3 phase motor? If it is, then it's star connected, since the star ends of the windings are inside the motor i.e. not at the terminal block, this would be unusual - all the winding ends - starts and finishes, are usually brought out to the terminal block.

Regards

 

[Spark123]

In the terminal box on the motor there are normally 6 pillars. If the links are arranged so there are 3 in parallel with the phase connections i.e. U1-W2, V1-U2, W1-V2, then it is configured for delta, if the links are across W2-U2-V2 with the phase connections to U1, V1 and W1 then it is star.
Some pretty pictures here: Clicky

 

[markymark2406]

yeah it is a 415v motor in star so does each winding terminate or do they go to a centre tap as to the star diagram

 

[Spark123]

U1-U2 are the 2 ends of one coil, V1-V2 2nd coil, W1-W2 the 3rd coil.
The bar across U2-V2-W2 is the star point, tho as the load is ballanced there is no need to have a neutral connected to it.

 

[markymark2406]

yes understand that, but i have a star motor 3 conection points, if i followed each winding where does and how does it terminate in the motor?

 

[Spark123]

If there are only 3 connections available then the star point will be installed somewhere internal to the motor windings.

 

[markymark2406]

what connected togeather?

 

[Spark123]

the ends of the 3 coils, aka the star point.
If you only have 3 connections, and 3 phase wires to put in them there is not a lot else you can do other than connect one to each. You cannot configure the motor differently unless you have access to both ends of each coil i.e. the 6 terminals.

 

[Steve]

i have just removed a motor from a hospital plant room im a bit of an idiot

Aye, lets hope it wasn't for anything critical.