For the G201, G203, or the G203v stepper drivers, the formula is:
47 X Amps / ( 7 - Amps) = Resistor. So, for your motor: 47 X 5.6A / ( 7 - 5.6A) = 188K resistor. A 180K or a 200K 1/4 Watt resistor would work fine ( or any other resistor that is +/- 5% of 188K). |
What a timely post. I was looking at this earlier.
For the MK 9801's: (47 * 4.1)/(7-4.1) = 66.5 kOhm Fantastic - this is 4x what I got earlier using the same calculation! A lot to be said for re-reading and re-calculating (and thinner fingers). |
Buy the UIM drivers. Amps are set with a onboard potentiometer...no more looking for resistors.;)
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The Geckodrive G201X uses an internal dip switch for selecting current limiting resistor values. It has most of the features of the G203v but costs less, $114 plus shipping.
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Hey Mike,
I was reading the manual and it actually states 47*I/ (7-I). That would be inductance no? Just confirming because on the G203V manual, it specified Inductance as part of the formula, not amps. Any ideas why? Thanks, chris |
From http://en.wikipedia.org/wiki/Electric_current:
The conventional symbol for current is http://upload.wikimedia.org/math/d/d...7f9b147d7f.png, which originates from the French phrase intensité de courant, or in English current intensity.[3][4] This phrase is frequently used when discussing the value of an electric current, but modern practice often shortens this to simply current. The http://upload.wikimedia.org/math/d/d...7f9b147d7f.png symbol was used by André-Marie Ampère, after whom the unit of electric current is named, in formulating the eponymous Ampère's force law which he discovered in 1820.[5] The notation travelled from France to Britain, where it became standard, although at least one journal did not change from using http://upload.wikimedia.org/math/0/d...4d143e1257.png to http://upload.wikimedia.org/math/d/d...7f9b147d7f.png until 1896.[6] |
Awesome explanation Gerald. Thanks for that! Very educational! :D
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Gerald, I don't know if you or wiki contains more knowledge.:D
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...Gerald.
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