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Old Wed 28 March 2007, 20:09
Mike Richards
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Difference between a Toroidal and a "standard" transformer - toroidal is much cooler

I built up an extra power supply from a 12A, 24V standard TRIAD transformer (Part No. F-226U). It is being used to drive four 3-amp PK296B2A-SG3.6 Oriental Motor stepper motors via four Gecko G203 stepper drivers. It also has a 11,000mF capacitor.

This transformer runs hot - 160-degrees F. or 60-degrees C. The figures show that it is a 288VA transformer (24V X 12A). Using Gecko's formula for four G203 running 3A motors, 4 X 3A X 0.667 = 8A, I should be able to use an 8A (200VA) power supply. I figured that using something 50% larger would help keep things cool.

Until now, I've only used a Toroidal transformer with my Gecko test bench. It is an AVEL Y236801 rated at 500VA. It has never even been warm to the touch. Perhaps the toroidal is just a lot more efficient, but I was really surprized to see the amount of heat this Triad generates. The G203s, the G100 and the stepper motors aren't even warm, but the transformer is too hot to touch.

It looks like it's time to order another A236801.
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Old Fri 30 March 2007, 09:53
Gerald_D
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Thanks Mike
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