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Do-It-Yourself (DIY) Question & Answer Forum
Three Phase or Single Phase for instruments
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<blockquote data-quote="Marvo" data-source="post: 545081" data-attributes="member: 20838"><p>With small fractional horse power items it often doesn't make much difference and you often find single phase versions will be cheaper due to economy of scale with the higher number being sold. </p><p></p><p>As motors get larger the 3-phase versions become cheaper than their single phase counterparts because often they run direct on line so they don't need start gear such as large expensive capacitors and centrifugal switches etc. </p><p></p><p>Also with larger single phase motors the cable size required to handle the inrush current without presenting a detrimental volt-drop become a factor.</p><p></p><p>Any motor that is in an application that requires high starting torque would generally be better as a 3-phase and once you get larger than 3 or 4 kilowatts in size you're almost always going to be using a 3-phase motor.</p></blockquote><p></p>
[QUOTE="Marvo, post: 545081, member: 20838"] With small fractional horse power items it often doesn't make much difference and you often find single phase versions will be cheaper due to economy of scale with the higher number being sold. As motors get larger the 3-phase versions become cheaper than their single phase counterparts because often they run direct on line so they don't need start gear such as large expensive capacitors and centrifugal switches etc. Also with larger single phase motors the cable size required to handle the inrush current without presenting a detrimental volt-drop become a factor. Any motor that is in an application that requires high starting torque would generally be better as a 3-phase and once you get larger than 3 or 4 kilowatts in size you're almost always going to be using a 3-phase motor. [/QUOTE]
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Three Phase or Single Phase for instruments
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