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Anonymous Poster

stuiped question

04/15/2008 3:37 AM

hi all

why there is three phase motor, three phase generator .........? and there is no two phase or four phase. i mean who design this because two phase can not turn the rotor and four phase can but it is useless if three can do it?
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Bolton_Alan
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#1

Re: stuiped question

04/15/2008 4:01 AM

Yes it is a stupid question and you pretty much answered it yourself apart from a two phase motor would work. Heard of single phase motors haven't you.

Congratulations.

Al

(Had a bad day with the maintenance engineers yesterday and I'm just waiting for it all to start again today)

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JRaef
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United States - Member - New Member Engineering Fields - Power Engineering - New Member

Join Date: Sep 2006
Location: California, USA, where the Godless live next door to God.
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#2

Re: stuiped question

04/15/2008 7:42 AM

Any number of phases (more than one is called "polyphase") can be used to turn motors. 2 phase was at one time just as common as 3 phase and in fact, Tesla's original polyphase motor was only 2 phase. But in a 2 phase system, the delivery of power is not as continuous as in 3 or more phases, plus it takes 4 wires to deliver true 2 phase power. 3 phase requires only 3 wires. 4 phase would be even smoother but takes 8 wires, 5 phase takes 10, 6 phase takes 6 again, etc. etc. etc.

So 3 phase power delivers the smoothest power delivery with the least amount of wire.

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Anonymous Poster
#3
In reply to #2

Re: stuiped question

04/15/2008 11:49 PM

jraef; why would 5 phase require 10 wires? thanks perry
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