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
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X, Y, Z: 42x34 1.8deg 0.84A 4xwires jk42hs34-0844 yal8-23
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E: 42x40 1.8deg 1.0A 4xwires jk42hs40-1004a-02f
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http://www.jkongmotor.com/Product/42HS-NEMA17-2Phase-Stepper-Motor-1-8%C2%B0.html
I searched for information about these motors for a long time and eventually turned to the company that made them for specifications. And they answered me that BJ42D22-23V16 is already BJ42D22-44V16, they changed the name, but BJ42D15-26V09 remained the same. On the Internet, everyone assumes that these motors are 1.5 amps, but this is not so. Based on their specifications BJ42D22-23V16 aka BJ42D22-44V16 has a rated current of 1 amp and BJ42D15-26V09 has a rated current of 0.84 amps! Now, having this data, you can easily adjust the voltage for your drivers on a stepper motor. Below I attach a link to my Google drive with detailed drawings and characteristics from these motors. I hope this will be helpful to someone, because I have come a long way to get this information. Link on Google Drive