three phase motor info needed

hello , to cut a long story short ive recently swapped a small lathe
for a larger one which i was told i could run on my(uk)domestic supply
.upon inspection ive found the motor is 380-415v ,2.2kw ,Y conn . its
been a real long time since ive worked with three phase ! i'm told
theres a trick to be done with the star connector allowing this type of
motor to run from a three phase 215v inverter ? can anyone point me in
the right direction ? i'd prefer not to change to a single phase motor
as the switch gear and panels are ready wired , and ideally would like
this motor to be adaptable ! any advice would be appreciated .....
Reply to
willowkevin
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About all that you can do is to reconnect the windings to delta. This means disconnecting the coils at the star point and reconnecting. Consider coils a1-an, b1-bn, c1-cn where n is the neutral and a1,b1 and c1 are tied to the hot leads a,b,c\ then connect a1 and cn to a, an and b1 to b, bn and c1 to c If rotation is wrong, reverse one coil. The new voltage rating will be 219 to240V. You will be at or below the rated range so will have some derating -say 2 HP at a marginally slower speed.
Reply to
Don Kelly
What you need is a 3 phase rotary power converter rated at 2.5 to 5kw. If you search on Ebay you might be able to find one. These are commonly used in rural mountaintop locations where FM Broadcast transmitters require 3 phase power. Usually they are made for 24 hour operation and are very efficient. In the US these items are usually 240 volts input single phase and 208 or 240 volts output 3 phase at 60 herts. If you can find one that has an input of 240 volts and a 3 phase wye output at 400 volts and 50 hertz you will be all set. Google 3 phase rotary power converters. You will need to make sure the output of the converter matches up properly to your wye connections of your lathe motor. I hope this helps you.
Dick R Broadcast Engineering Consultant
Reply to
Dick R
----------- Added comment - what I missed saying is that by connecting delta at the lower voltage - the line current will increase to 173% of that for a star at the same power. This affects breakers and wiring but you would have to check this.
Reply to
Don Kelly
No, at 2kW, you can buy a 240V VFD and most brands will accept a 1 phase input yet provide a 3 phase output without derating. You will still need to reconnect the motor in Delta as someone else pointed out however.
Reply to
Bob Ferapples

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