Electronics > Beginners

Running an US Fridge Compressor in Europe?

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Towger:
The fridge just needs a decent step down transformer, not the micky mouse one photoed.   The cheapest source would be a building site transformer.   All in all it would have been easier/cheaper to buy another fridge, taking the transport costs into account.

My grandmother had a big yank fridge from the 1940's to the 80s. There must have been at least a cubic foot of copper in its stepdown transformer.  It was given away and the new owners got years more out of it.  I believe it was imported from America during 'The Emergency' aka WW2 to store medicine.

vk6zgo:

--- Quote from: Monkeh on October 13, 2018, 03:57:59 am ---
--- Quote from: alpher on October 13, 2018, 02:39:13 am ---Let me elaborate then, "a few of kiloamps" is actually a very weak network,
Minimum for any kind of dwelling should be arround , 20Ka, most  of Ontario area being in 200Ka range for most of commercial and some   of residential dwelling, and   some unfortunate souls being close to the transformer even higher (which cost serious money).
Don't wan't to start a pissisng mach  but the relative absence of star/delta starters so common in Europe speaks for itself. I've never seen one used on a motor of less that 150Hp.

--- End quote ---

I'm sorry, what?

No normal residential installation can handle a 200kA fault current. Hell, most decent size industrial ones can't. And you're going to have one hell of a time achieving that with 120V! 20kA is already very substantial.

20kA at 240V would require an EFLI of just 12mΩ - with 4AWG conductors that's only 7.5m of cable. 200kA would involve just 1.2mΩ - that's about 3m at 0000AWG.

Would you like to try again with your brain engaged?!

--- End quote ---

Yes, I can't see how any kind of domestic fridge can draw start currents of the magnitude quoted by alpher .

In any case, it will be halved by the higher voltage.
This is the main advantage of the 220/230/240v Mains--- less current for the same power.
(Also why, in North America, the so-called "split phase"  240v system is often used for major appliances.)

OK, maybe Wolfgang is correct, & the motor will not run correctly at 50Hz, but if this entails the use of an inverter, that is where the doubt about start current applies.
The start current as far as the Mains supply is concerned, is concerned will not be the problem.

I must admit, I'm a bit bemused by his reference to a star/delta starter & a 150hp motor.
Surely this presupposes a three phase supply, which has little to do with the present case.

It is too long ago that I learnt about ac motors, but I've worked around a lot of big ones & small ones.
The small ones usually have a capacitor start, which I have had occasion to change.

The big ones just trundled on virtually forever, & in the odd case of one dying, was sent off for rebuilding.
I cannot remember any external starter device associated with them that failed, so I never got to look inside them.


GeorgeOfTheJungle:
Can't run a 60Hz AC motor at 50Hz, you're going to fry it! Why? Because the inductors are going to enter saturation => overheat => short or even worse: catch fire.

The Soulman:

--- Quote from: GeorgeOfTheJungle on October 13, 2018, 09:42:18 am ---Can't run a 60Hz AC motor at 50Hz, you're going to fry it! Why? Because the inductors are going enter saturation => overheat => short or even worse: catch fire.

--- End quote ---

Yes although running it at a lower voltage like 100 Volt might (no guarantee) avoid that its still a bit of a risk (fire hazard).

The cheapest and most practical solution is to get a new fridge.

Or less practical but should work, a beefy (remember startup current) professional power amplifier and a 50 hz oscillator.  :P

station240:
I have to wonder if having a refrigeration technician fit a replacement compressor would be an affordable option.
Find out what model number is on the sticker attached to the compressor, see if there is a 220/240V 50Hz version.

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