A4988 Drivers
Vref set to ~90% of stepper rated current
Rs = 0.1ohm
X = 0,58v (0,725A)
Y = 0,58v (0,725A)
Z = 0,58v (0,725A)
E = 0,72v (0,900A)
Naming: [JK][S]HS[L]-[100][4]
JK: Manufacturer (jkongmotor) S: Size (42mm) HS: Hybrid Stepper L: Length (34/40mm) 100: Rated current 1.00 4: Number of wires
X, Y, Z: 42x34 1.8deg 0.84A 4xwires jk42hs34-0844 yal8-23
E: 42x40 1.8deg 1.0A 4xwires jk42hs40-1004a-02f
http://www.jkongmotor.com/Product/42HS-NEMA17-2Phase-Stepper-Motor-1-8%C2%B0.html
@MaxMishchenko any chance you can reach out to your contact and see if they have details for the BJ42D15-26v12?
@MaxMishchenko any chance you can reach out to your contact and see if they have details for the BJ42D15-26v12?
I've specs Here for both BJ42D15-26V12 and BJ42D15-26V19 (This is the same spec as the BJ42D15-26V02 hence drawing ID matching)
@not-crazyramen the currents listed on the blueprint are max currrent. To find the RMS divide the max current by 1.414. I run my Sprite extruder driven by TMC2209 UART at 600ma. Hope that helps.
Hi pal. It´s correct divide by 1.414. Is not multiplicate by 0,707 for RMS Value?
@not-crazyramen the currents listed on the blueprint are max currrent. To find the RMS divide the max current by 1.414. I run my Sprite extruder driven by TMC2209 UART at 600ma. Hope that helps.
Hi pal. It´s correct divide by 1.414. Is not multiplicate by 0,707 for RMS Value?
It’s the same thing…
1A/1.414=0.707A
1A*0.707=0.707A
Hi. I think you're wrong pal. I remember the electronic classroom in the first year and say0.707. i find this:
How to calculate RMS value of current?
Then, the RMS voltage (VRMS) of a sinusoidal waveform is determined by multiplying the peak voltage value by 0.7071, which is equal to one divided by the square root of two (1 / √2)
Dividing something with 1.414 is the same as multiplying something with 0.707. I’m not smart enough to see what the problem is. Hopefully some one else can help you.
I can't speak to "usually". It's often as high as 90%, and it can be set much lower to save a little power if you aren't running a race printer. Feel free to adjust it downward until your printer starts losing steps, then back up until the step loss disappears.
Then pop a note into the control board compartment to remind yourself of that adjustment in case you ever get the Need for Speed and want to adjust it higher again.