Ena faza v tri faze

cekr je 29. avg 2012 ob 18:47 izjavil:

Magic1 je 29. avg 2012 ob 17:01 izjavil:

Če na stružnici piše, da je tudi na 230V, potem jo pač primerno zvežeš na eno fazo.
Saj tudi pri trofaznem ima vsaka faza le 230V ;)

Ne klaftraj traparije.

O faznem zamiku še nisi slišal.

Three-phase motors will run on single-phase power. What they WON'T do is start. There is no easy way to re-wire such a large motor to run on a single phase.

Properly sized capacitors and a special relay is sometimes used on sewage lift stations (poopie stations is what we call them) to run the 3-phase pumps on single phase.

I've seen 10 hp motors used. Sometimes a lift station is needed where 3-phase power is not available The motor will not develop it's full horsepower, only about 2 thirds. A push-button can be used in place of the relay, but you will have to push the button until the motor starts then let go. If the motor stops you will need to push the button again. Usually expect several hundred micro-farads to be needed.

I have used old A/C motor-run capacitors in parallel to experimentally determine the actual size (capacitance) needed. Be sure to use correct working voltage capacitors. DANGER!!! Electricity can EASILY kill you and capacitors can blow up in your face!!!

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I've seen crazy people attempt to rope-start three-phase motors (it works), connect phase converters, all sorts of weird stuff. In reality, single-phase 5hp motors are available, so the a good recommendation is to trade-in the 3-phase motor for a 1-phase motor of the size you need.

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To run a three phase equipment from a single phase source, you will need something called a "phase converter".

Before you go out and buy one, find out if a single phase motor is available to match your requirements. It will probably be an easier solution for you if you can do that.



Depending on your application, another option with such a large motor is to get a "Variable Frequency Drive". These are somewhat expensive but will take in a single-phase input and output 3-phase.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.

Run capacitor = 25-30µF per HP

Supplying power to a 3-phase motor using a single phase is termed "single phasing", which is, in general, not good for the motor. Depending on the connection, one phase or two phases will have higher than normal current draw, which could damage these legs. If lightly loaded, the motor might be fine.

Ne nakaj napamet delat, pejt do enega(ali poklič), ki se ukvarja z el. motorji in vpraš. Štromarji načeloma niso smotani in povejo brez da bi ti računal.

lebang1 je 30. avg 2012 ob 08:38 izjavil:

@telexdell, čisto zgrešeno.

Rabiš le en primeren kondenzator, ki ti simulira drugo fazo.
Tako da imaš nekakšen 2.fazni sistem, kateri deluje cca 20% slabše kot 3f.

fpbs je 9. jan 2014 ob 19:57 izjavil:

einstein :P je 2. sep 2012 ob 21:03 izjavil:

V glavnem rad bi se zahvalil vsem štromarjem in ostalim, ki ste pomagali usposobiti zadevo. Priklopil sem nulo na L2, L1 in L3 pa sem povezal skupaj na fazo in pognal z roko (nisem dal kondenzatorja) in zadeva je delovala!!! Problem je le, ker ko nataknem še jermen gor ne more obrniti, ker je premalo moči. Bi mogoče zadevo rešil s kakšnim kondenzatorjem? Aja, pa moč stružnice je le od cca. 200 do 450W - to je majhna namizna stružnica, kot sem že v prvem post-u napisal. V glavnem, zdaj se vsaj motor vrti. Ko pa ste že zagreti, bi pa vas prosil še za pomoč pri priklopu motorja od črpalke katerega moč je od 1,1 do 1,32kW. Poskušal sem ga že enako priklopiti, kot stružnico ampak je samo naglas brnelo (kar se ne sliši dobro) in vrtenje z roko tudi ni pomagalo, saj se ob vklopu čisto zablokira. Ravno tako, kot stružnica ima možnost priklopa tudi na 220-240V le ne vem, kako. Spodaj so slike priklopa in ploščice. (slikano s telefonom ) Na zgornjih treh priklopih piše W2, U2 in V2, na spodnjih pa W1, U1 in V1 (ni nujno, da sem prav po zaporedju napisal).

Hvala za odgovore in vaš čas.

S teh tvojih slik je razvidno, da motor lahko priklopiš samo na tri faze v vezavi zvezda - trikot, ne moreš ga pa priklopit na eno fazo.