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Fusion
Newbie

Joined: 29/11/2009
Location: Australia
Posts: 5

Posted: 09:36am 10 Jan 2010

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hi I am back with a problem that I can't nut out.
I like to run my dual F+P on 7phase 1X6C Delta on my slow running mill.I like to run it on 24 V .With Delta I connect 1 out to 3 in, 3 out to 5 in, 5 out to 7 in, 7 out to 2 in, 2 out to 4in, 4 out to 6 in, and 6 out to 1 in.Please correct me if I'm wrong.
In the drawing the numbers running anti clock wise is this for a mill that runs anti clock wise or clock wise

thanks for your help

KarlJ

Guru

Joined: 19/05/2008
Location: Australia
Posts: 1178

Posted: 09:59am 10 Jan 2010

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makes no difference delta connection a little more complicated with 7 phases, try it and put the rotor on, give it a spin, if it doesnt spin then you got it wrong, if it does you got it right!

Good luck keep us posted with the results, I posted the same question some time back and was advised against it but by all means give it a shot

Luck favours the well prepared

Fusion
Newbie

Joined: 29/11/2009
Location: Australia
Posts: 5

Posted: 02:06am 12 Jan 2010

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thanks KarlJ I'll give it a shot. How do you run yours.

KarlJ

Guru

Joined: 19/05/2008
Location: Australia
Posts: 1178

Posted: 06:24am 12 Jan 2010

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I've got two configs for the twin stator.
80S in 2X7C (split in half basically)
same again but in delta
100S as is from F&P
100S in delta

if you're looking for 24V then a 100S in half or
an 80S in 7x2C (actually a better match for 24V than the
2X7C is for 48V)

then run the cap doubler per the home page, this will halve the cutin speed, where delta is traditionally 1.7x the speed required for cutin allows you to reap the benefit of delta wired stator (about 1.7x more grunt) with a lower cutin than one wired in star.

depending on the cap size you go for the doubler will set you back $10-100 in bits.

I think the recommendation is 100-300uF and 400V+.
I went for 680uF back to back (giving 340uF) and 450V 105c rated caps based on Phill's advise.

Luck favours the well prepared

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