3 phase motor wiring

[fuzzytrifle]

One of the motors on my 3 phase universal woodworking machine died a few months ago - bit of a bang, lights went out, ran for a while, but with loss of power before throwing the electrics again.

After discovering that a motor rewind would cost roughly the same as a new motor I decided to check ebay. Luckily I found an exact same motor which the seller had removed from a similar machine and replaced it with a 240v one to convert his machine to run on a domestic supply.

The motor plates are identical on both motors.

I'm not really that knowledgable as far as 3 phase motors go, but the original motor, and all the other motors in my workshop are connected like this:

View media item 55755
However the replacement ebay motor has been connected like this:

View media item 55756
Is this how 415v motors are wired to run on 240v?
Can I just rewire the connections to match the original motor?
What would happen if I just connected it as it is?

Many thanks in advance

 

[SaladFingers]

Those are star delta links, undo the bolts and arrange them in the same manner as your old motor.

 

[dingodeano]

The first is star connection.
Second is delta.

 

[RF Lighting]

The top one is star. That is what you want with a standard 400V three phase supply.

The bottom way is delta. This is only used if you're driving the motor from a 230V inverter.

 

[mikeyd]

What would happen if I just connected it as it is?

It will spin a bit faster, but maybe not for too long

As said above, put the links across the top like your old one. If you want to know Y read about wye and delta. Always known it as star / delta myself.

[ramble] I remember my first summer job, many years ago, reconditioning star/delta starters. These were big rack mounted things, seriously heavy. They started the motors up in star to reduce the current then once up to speed it would switch it to delta [/ramble]

 

[stillp]

I remember my first summer job, reconditioning star/delta starters. These were big rack mounted things, seriously heavy. They started the motors up in star to reduce the current then once up to speed a contactor would switch it to delta quote]
(further ramble)
The technical college machines lab where I used to work had a couple of manual star-delta starters. One lecturer always used to demonstrate (at least once per term) that if you didn't give it enough time to run up to speed before you switched to delta then the fuse would blow...
He used to do something similar with DC faceplate starters as well, leaving me with the job of making new field resistors.

 

[Spark123]

The bottom way is delta. This is only used if you're driving the motor from a 230V inverter.

Not always true, it depends what the plate says and the torque requirements of the motor.

 

[SaladFingers]

The bottom way is delta. This is only used if you're driving the motor from a 230V inverter.

You've not done much (or any) three phase then.

 

[mikeyd]

I understood RF's answer, as I think you two did too.
Not sure he was expecting the Spanish inquisition but this is my interpritation:

The bottom way is delta. This is usualy only used if you're driving the motor from a 230V inverter.

 

[SaladFingers]

I understood RF's answer, as I think you two did too.
Not sure he was expecting the Spanish inquisition but this is my interpritation:

The bottom way is delta. This is usualy only used if you're driving the motor from a 230V inverter.

Well, no even that's not true. Delta is widely used in industry.

 

[RF Lighting]

The bottom way is delta. This is only used if you're driving the motor from a 230V inverter.

You've not done much (or any) three phase then.

You're a dick

 

[SaladFingers]

The bottom way is delta. This is only used if you're driving the motor from a 230V inverter.

You've not done much (or any) three phase then.

You're a dick

Mature. Are you 15? That's the sort of response I'd expect from an infant.

 

[RF Lighting]

Ha ha ha ha ha ha how can you call anyone immature with your posting history?

 

[SaladFingers]

Ha ha ha ha ha ha how can you call anyone immature with your posting history?

Well lets just start with your responses on this thread shall we?

Name calling and ha ha's isn't backing up a thing for you.

 

[RF Lighting]

I'm gonna get my dad on you.