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Anonymous Poster

give double phase supply to single phase motor

12/03/2007 10:10 PM

if we will give two phase supply to single phase motor what will happen wheather it will run or not run.what ever will happen please post me in details with each & every thing

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#1

Re: give double phase supply to single phase motor

12/04/2007 1:57 AM

First you need to tell how you plan to connect a two phase source to a single phase motor and secondly, what is the relationship between the two phases, assuming that the voltages are compatible?

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#2

Re: give double phase supply to single phase motor

12/05/2007 10:13 AM

You cannot connect two phases to a single phase motor, it will burn up. Why would you want to do this? You need only the one phase and a neutral for this motor to run. Hope this helps

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#16
In reply to #2

Re: give double phase supply to single phase motor

12/07/2007 7:22 AM

thanks for this.

i would like to know by giving two phase to single phase motor if it will burn.what it is the reason why it will burn.it will burn immeadiatly or after running some time.

thanks in advance

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#17
In reply to #16

Re: give double phase supply to single phase motor

12/07/2007 8:25 AM

It MAY run a short time but doubling the voltage doubles the current and heat causing a short run and burnout of the windings.

Try it, you won't like it. NO DON'T TRY IT. Ruins a good motor and could be a danger to you as well.

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Anonymous Poster
#18
In reply to #16

Re: give double phase supply to single phase motor

12/07/2007 9:55 AM

You have not provided enough information about the particular motor or the 2 phase supply to make any determination as to what will happen.

If the question is general in nature, there really is not a correct answer.

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Anonymous Poster
#3

Re: give double phase supply to single phase motor

12/05/2007 3:29 PM

First of all, I'm curious as to where a 2 phase electrical supply is still available.

If I assume the motor has only 2 leads since it is a single phase motor and a 2 phase source has 3 leads, so any connection that employs all 3 leads will likely result in a short circuit.

If I assume the motor has 3 leads to accomodate a start and/or run capacitor that is missing from the motor winding circuit, then it's kind of a crap shoot as to what's going to happen. Most likely result will be burning out one of the motor windings

You really need to provide a bit more detail.

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#4
In reply to #3

Re: give double phase supply to single phase motor

12/05/2007 4:42 PM

If the motor only has 3 leads doesn't really mean that the third is for the capacitor. Anyway the capacitor gets connected in paralell with the motor so the motor will just need 2 leads. 3 leads may result in a 3 phase motor in star configuration :)(not very usual). And yes..you can connect the motor to 2 phase even if the motor is mono but you have to limit the current with resistors or inductions(coils), and also to be sure that the motor'sinsulation supports the applied voltage.

Vphase-phase=Vphase*√3

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#5

Re: give double phase supply to single phase motor

12/05/2007 5:39 PM

I don't think you have a clue as to what you are talking about!!!

Diagrams and some common sense please would help all concerned.....

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#6
In reply to #5

Re: give double phase supply to single phase motor

12/05/2007 6:10 PM

TO ANDYGERMANY: Why not be nice instead of arrogant. Sure to you and most it was obvious the guy didn't know he was asking BUT he is a person and talking down to him (and anyone) just make ill feelings. Negatives beget more negatives . Its just as hard to be nice as it it to be mean.

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#7
In reply to #6

Re: give double phase supply to single phase motor

12/05/2007 6:24 PM

Then just wait till he kills himself or somebody near him!!! This is first and foremost a safety issue.......

Its better to be exact and give him a quick "heads up" hoping to stop him in his tracks.......following your advice could easily KILL!!! Mamby pamby attitude.....

My answer is as rude as the question was stupid!! Equal portions....perhaps he might stop and learn something......maybe.

Up to now I have never seen you make a proper scientific answer backed up by verifiable and know facts to anything and your web page is the same.......all I see is a full time scam agent......

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#8

Re: give double phase supply to single phase motor

12/05/2007 6:24 PM

TO: GUEST

If you have a single phase motor for example 110 volts and you have a 2 phase connection for example 220 volts (using two 110 volt hot wires and a nuetral or ground), you can yes connect but only to one or the other 110 v sides. DON'T connect to both hot wires on the 220 supply as it will blow the breaker and or burn out the motor windings. Simply cap one 110 volt hot wire off and use the other 110 volt hot and the nuetral or ground. If you are unsure consult an electrician who can look at exactly what you have.

Make sure it has an appropriate amperage circuit breaker or fuse connected to prevent fire and equipment damage.

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#11
In reply to #8

Re: give double phase supply to single phase motor

12/05/2007 8:08 PM

"DON'T connect to both hot wires on the 220 supply as it will blow the breaker and or burn out the motor windings. Simply cap one 110 volt hot wire off and use the other 110 volt hot and the nuetral or ground."

In which case you are connecting the motor to a single phase........

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#12
In reply to #11

Re: give double phase supply to single phase motor

12/05/2007 8:18 PM

In which case you are connecting the motor to a single phase........""

=============

Yes exactly. 2 phase 220 v is made up of 2 single 110 v phases in this case. We have to remember that we have to interpret sometimes what the new comers (god bless them for they are they future) have in their grasp and what they are looking at. (it might be an old heater supply that is outside in the old tool shed and its dark, cold, snowy, tired, frustrated, using flashlight or candle. etc. )

All they know is xyz and they are reaching out for a friendly face to help them out of their dilemna , the LAST thing we'd want to do is "talk down to your brother or sister in trouble sincerely, and humbly seeking help).

Its easy for us to sit up on our mountain and discredit using hindsight and arrogance of a armchair qb.

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#9

Re: give double phase supply to single phase motor

12/05/2007 7:05 PM

Guest:

REGISTER and use you name when you post. If you ask a stupid question you can be contacted privately rather than generate off topic post and rude remarks. Also clarify what your intent is.

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#10
In reply to #9

Re: give double phase supply to single phase motor

12/05/2007 7:16 PM

RE: Stirling Stan comment: "REGISTER and use you name when you post. If you ask a stupid question you can be contacted privately rather than generate off topic post and rude remarks. Also clarify what your intent is . "

==============

Because questioning is an attempt to find out, discover, clarify, define, support, reinforce, information THERE IS NO SUCH THING AS A STUPID QUESTION. WHen you learn this you can then be a good teacher and leader .

Stalin: If we want your opinion we'll tell you what it is. Hitler: The forced marches will continue until morale improves.

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#13
In reply to #10

Re: give double phase supply to single phase motor

12/05/2007 8:37 PM

RE: TRIPLEBATTERYLIFE comment: "Because questioning is an attempt to find out, discover, clarify, define, support, reinforce, information THERE IS NO SUCH THING AS A STUPID QUESTION. WHen you learn this you can then be a good teacher and leader."

I beg to differ. You have either not spent much time teaching, or have been blessed with having only the best, most well behaved students. Questions that are asked with only the intent to disrupt, are in my book, STUPID. I will concede the point that maybe many of these questions here that are labeled "stupid" are not. They are merely "LAZY" questions, which are regarded by many as being the same.

PS: nuetral is spelled "neutral"

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#14

Re: give double phase supply to single phase motor

12/05/2007 8:48 PM
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#15

Re: give double phase supply to single phase motor

12/06/2007 2:05 AM

please practice real engineering, because you are trying to violate the basic rules and manufacturers specsfications. so do not do that.

Regards

JUSTUS

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Andy Germany (2); Anonymous Poster (1); Clintb32 (1); KWS E&I Guy (1); LCAC32 (3); manish kumar (1); nikolay (1); Stirling Stan (2); TRIPLEBATTERYLIFE (4)

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