a4988 adjusting current

hello,

so have 28byj-48 (5 volts) stepper motor converted bipolar guide

http://www.electronicsmayhem.com/?p=13

1. after converting bipolar right use 10-12v dc ?
2. how can calculate current adjust on a4988 driver ?

here 28byj-48 unipolar characteristics

code: [select]


model ： 28byj-48
rated voltage ： 5vdc
number of phase ： 4
speed variation ratio ： 1/64
stride angle ： 5.625° /64
frequency : 100hz
dc resistance ： 50Ω±7%(25℃)
idle in-traction frequency : > 600hz
idle out-traction frequency : > 1000hz
in-traction torque >34.3mn.m(120hz)
self-positioning torque >34.3mn.m
friction torque : 600-1200 gf.cm
pull in torque : 300 gf.cm
insulated resistance >10mΩ(500v)
insulated electricity power ：600vac/1ma/1s
insulation grade ：a
rise in temperature <40k(120hz)
noise <35db(120hz,no load,10cm)


thank you

actually ~7v (5 x sqrt(2)), since power dissipation limiting factor normally, v^2/r should remain same
and you've doubled r.  note give sqrt(2) times more torque.

measure original current, divide sqrt(2)...

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