How to run a single phase 220v 50 hz motor at 110 v 60 hz

[hyoid]

I have a lathe motor from Europe which is 220v 1/7 hp 0.8 amp 50 hz. My supply is 110 volts 60 hz. I do have a transformer which can up the voltage to 220 but I am concerned about the frequency. Is there a frequency converter or vfd which can work?

Thank You

 

[waross]

I have a secondary question for the VFD gurus.
If a single phase VFD is fed from 60 cycles and the output at 50 Hz is fed to a wye:delta transformer, will the transformer be able to supply a 50 Hz motor?
If the transformer is connected to the mains the only issue will be derating by 1/3, however the current will be phase shifted on two phases. No problem on the grid but will a VFD be able to cope with a greatly different phase angle on each phase?
If the VFD can cope, this would supply a voltage and frequency that is suitable for the single phase motor.
Don't try to vary the speed very much on a single phase motor.
Don't use a starting capacitor.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[itsmoked]

hyoid; Check this out. faq237-1224

Probably it would work. You would need the transformer however.

Bill. I'm not sure.?

Keith Cress
kcress -

http://www.flaminsystems.com

 

[jraef]

You really did not supply enough information to let us provide anything more than guesses, because we have to make assumptions. So here are my assumptive responses.

1) If you want to do it with only a transformer, you need to keep the V/Hz ratio the same (or at least within 10%). So if you REALLY have a 220V 50Hz motor with a 4.4:1 V/Hz ratio, to run it on 60Hz you would need 264V. Then it will simple run 20% faster. To get 264V from a 110V supply (although it's probably 115V) you need to use a transformer with a 2.4:1 turns ratio, that will be hard to find. But before going off half-cocked, don't assume anything, measure your actual voltage and read the actual nameplate of that IEC (European) motor first.

2) If your IEC motor is 3 phase (you need to check), then I would instead buy a cheap little VFD that accepts 120V input and provides a 240V 3 phase. They are out there, no need to step up the voltage, it does so internally (on the DC side with a voltage doubler for those who don't know). Then you can program the VFD to provide the EXACT voltage and frequency that you read on the motor nameplate.

3) If it is a 1 phase 220V, 230V, or 240V IEC motor, go back to the transformer method and live with the higher speed.

4) At that small of a HP rating, there is a chance it is a DC motor, which means you have a DC drive on there already and input frequency may not be relevant at all. But again, it all depends on what you really have.


"If I had eight hours to chop down a tree, I'd spend six sharpening my axe." -- Abraham Lincoln
For the best use of Eng-Tips, please click here -> faq731-376

 

[ScottyUK]

5) Scrap the motor, buy an equivalent 60Hz motor and adjust the pulley sizes to correct for the 20% overspeed you will get running a 50Hz machine on 60Hz.


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If we learn from our mistakes I'm getting a great education!

 

[itsmoked]

Scotty; That's what I'd do right after I added the transformer and ran the existing motor until it smoked.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[ScottyUK]

You just like the smell of the smoke don't you...



----------------------------------

If we learn from our mistakes I'm getting a great education!

 

[jraef]

It's in his name, and likely his blood.

 

[itsmoked]

Keith Cress
kcress -

http://www.flaminsystems.com