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Thread: Two Small 3 phase Motors - NSW
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25th Mar 2021, 01:49 PM #1Golden Member
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Two Small 3 phase Motors - NSW
I am after 2 x 3 phase motors about 1 - 2kw. I am thinking of building two linishers shown in the video if the budget is reasonable.
CHRIS
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25th Mar 2021, 03:10 PM #2Most Valued Member
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Hello Chris,
I have a few but only have details of one at present, I won't have the others details until Sunday.
3/4 HP, 1440, 4 pole, Star ,1.5amp, 50 cycles, continuous.
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25th Mar 2021, 07:54 PM #3Golden Member
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25th Mar 2021, 09:20 PM #4Member: Blue and white apron brigade
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Not sure what size belt you are intending to run but my experience is that 3/4Hp is going to be too light for a 50 mm wide belt.
My small Linisher has a 50mm wide belt and a 1HP motor and it's still relatively easy to bog down.
A well designed linishers like a Radius Master uses a 2HP 2880 rpm motor for a 50 mm belt.
Its spec says 3000 fpm for belt speed which means it must be using about a 4" drum.
If the linisher is to be used for heavy grinding even better would be ~4500 fpm
This could be achieved with a 6" drum or a VFD.
If a 1440 rpm motor is used, to reach 3000 fpm with a 4" drum and a VFD means operating at 100Hz, while 4500 fpm means 137Hz, in this zone standard 3P motor will loose considerable power
A 2880 rpm motor will reach 4500 fpm at about 75Hz - well within the original motor spec HP.
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29th Mar 2021, 07:50 AM #5Most Valued Member
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29th Mar 2021, 09:51 AM #6Golden Member
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