Re: wire for motor
Posted by
Mike Smithson
on 2006-12-11 14:09:06 UTC
Don't overlook the fact that you will be dealing with pulsed current. The
peak currents can be quite high in comparison with the 'average' as a
consequence the voltage drop during each high pulse will be significant on
small (26g) wire. Also there is considerable potential for producing
interference from the current pulses in these wires. I have found that
twisting each pair of wires at no less than three turns per inch (1.181
turns per cm :-) then twisting each pair of pairs together you will have
less likely hood of getting interference induced into control wiring (I
twist the control wiring the same way). I use 20 g stranded wire for my 2
amp steppers. I have not needed to use any shielding or special decoupling
apart from a very good filter in each transformer input. Ribbon cable is
neat but doesn't lend itself to twisting each pair and doesn't have enough
copper to prevent power losses that will reduce the overall performance of
your steppers.
Mike
peak currents can be quite high in comparison with the 'average' as a
consequence the voltage drop during each high pulse will be significant on
small (26g) wire. Also there is considerable potential for producing
interference from the current pulses in these wires. I have found that
twisting each pair of wires at no less than three turns per inch (1.181
turns per cm :-) then twisting each pair of pairs together you will have
less likely hood of getting interference induced into control wiring (I
twist the control wiring the same way). I use 20 g stranded wire for my 2
amp steppers. I have not needed to use any shielding or special decoupling
apart from a very good filter in each transformer input. Ribbon cable is
neat but doesn't lend itself to twisting each pair and doesn't have enough
copper to prevent power losses that will reduce the overall performance of
your steppers.
Mike