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
On my Ender-3 S1 with dual Z-Axis I measured on the Silent Board (CR-FDM-v24S1_301):
X= 1.214V 42-34
Y=1.205V 42-34
Z=1.503V 42-34
E=0.943V 42-20
I try to find the supplier of the stepper motors to get some kind of datasheet. Here my findings:
| Axis | Size | Markings | Resistance(Ω) | Model | Current | Link |
|---|---|---|---|---|---|---|
| X | 42-34 | BJ42D15-26V09 | 6.0 | BJ42D15-Y???? | ?.? | Hunan Keli Motor Co.,Ltd. |
| Y | 42-34 | BJ42D15-26V10 | 6.0 | BJ42D15-Y???? | ?.? | Hunan Keli Motor Co.,Ltd. |
| Z | 42-34 | BJ42D15-26V12 | 6.0 | BJ42D15-Y???? | ?.? | Hunan Keli Motor Co.,Ltd. |
| E | 42-20 | BJ42D09-20V02 | 1.8 | BJ42D09-02V02 | 0.4 | Hunan Keli Motor Co.,Ltd. |
I measured the Resistance, but can't spot on wich model Creality exactly use. Other sources go up to 1.5A for the 42-35 what is way off the values I can find off China suppliers. It looks like Creality use second chose stepper motor wich is normally rated at 1.0A.
The Value of 0.8A looks for me the right spot for the "Creality" Steppers. But then is the default VREF of 1.2+V for the X,Y Axis way to high and for the dual Z-Axis way to low.
My new Settings are:
X+Y Axis: 1.027V
Z Axis: 2.054V
Extruder: 0.513V
Are you agree with this values?
Edit: I see the continuous motor current of the TMC2208 is 1.4A and peak current up to 2A, but the dual Z-Axis need 2.054A (two with 1.027 each)
What I have do do with the Z-Axis?
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
Thanks MaxMishchenko and everybody else that adds their findings. My motors doesn´t have any labels so my initial findings might be wrong. I´m no expert.
Hi folks.
I have the 42-40 BJ42D22-23V16 (LOT NO.201227C) Motor
Here is the info I could find: https://www.reddit.com/r/klippers/comments/s4px5x/comment/hssi4sy/?utm_source=share&utm_medium=web2x&context=3
The Creality 42-40 Motors which are mounted at X-Y-E (BJ42D22-23V16) are rated at 1.5A = 1500mA
However, as the user @MaxMishchenko says above, it's 1A, that is, it's a renamed: BJ42D22-44V16.
It came with my Ender 5 Pro, 4.2.2 motherboard and TMC2208 (B) drivers.
I have no idea what company makes these motors though. Would be nice to know for support reasons.
Hope someone finds this useful. Most Creality firmwares I have tried put this motor in reverse when printing (feeds filament AWAY from the hotend) so I am compiling my own firmware to fix this.
@Avedena on my S1 the X and Y steppers were running hot as hell. I measured the vref and it was set to 1.189V for both, turned them down to your suggested 1.027V and they are still warm but not crazy hot. Thanks!
Does anyone know what run current I should be using for the BJ42D09-20V02? (as found on the Creality Sprite extruder).
It says on their website that it's "0.6A", but I see someone above mentions 0.4 - which seems awfully low for an extruder motor.
@sammcj On my S1 I measured the E vref on the pot is 0.934v, hope that helps.
I managed to get hold of someone at Hunan Keli Motor Co who very helpfully shared this schematic with me for the BJ42D09-20V02 as used on the Creality Sprite extruder (found on the Ender 5 S1). Sharing here as it may be useful for others.
@Avedena according to these specs your table for the rate current for the BJ42D09-20V02 needs updating, resistance should be 1.75, current should be 0.84
creality 회사의 bj42d15-26v12의 stepper motor 정격전압과 정격전류좀 알려주세요 몇 볼트일때 작동하는게 좋은지가 궁금해요 아무리 찾아봐도 안 나와요ㅜㅜ
creality 회사의 bj42d15-26v12의 stepper motor 정격전압과 정격전류좀 알려주세요 몇 볼트일때 작동하는게 좋은지가 궁금해요 아무리 찾아봐도 안 나와요ㅜㅜ
Einen wunderschönen guten Tag.
Not very helpful, using you native language here isn't it?
Please be considerate of others when posting here. Those of us with notifications really don't need distracting and otherwise pointless emails. Thanks.
Can I use jk42hs40-1204a-02f for extruder?
Anyone know anything about BJ42D09-0v03? I cannot find any source for this revision or data, and can only seem to get it from the "Creality Sprite Pro" package sources. I can't even find a spec sheet from any OEMs. I'm hoping to just replace a failed stepper motor from a more direct source, than paying the ~$100+ for other parts I don't need (in addition to the stepper motor).
Does anyone know if these currents are the RMS current or the true max? I'm finding conflicting info through google
@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.
@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.
Yeah it does. Thanks! Do you know if that's the industry standard for "rated current?"
@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.
Yeah it does. Thanks! Do you know if that's the industry standard for "rated current?"
Not sure exactly how industry determines that.
@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.
Yeah it does. Thanks! Do you know if that's the industry standard for "rated current?"
Not sure exactly how industry determines that.
The manufacturer decides what temperature the motor can tolerate continuously without degradation of the insulation on the motor's windings. They then determine how much current in 100% duty cycle stepping operation will raise the windings to that temperature.
That's the rated current.
Note that my explanation here is simplified a little.
@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.
Yeah it does. Thanks! Do you know if that's the industry standard for "rated current?"
Not sure exactly how industry determines that.
The manufacturer decides what temperature the motor can tolerate continuously without degradation of the insulation on the motor's windings. They then determine how much current in 100% duty cycle stepping operation will raise the windings to that temperature.
That's the rated current.
Note that my explanation here is simplified a little.
On 3D printers it is usually set 80% of the rated current. Hope that helps.
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.
@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.
My motors do not have any labels so I don’t know for sure what motor I have. I measured XYZ to 5.9 ohm and E 4.0 ohm which correspond well to the motors in my post. Also vref XYZ 0.59V >= cap 88% and E 0.73 => cap 91% which is reasonable (assuming that MAX XYZ=0.84A and MAX E=1.0A).
It’s not uncommon that manufactory have several suppliers for the same/similar part so BJ42D22-23V01 might be compatible with JK42HS40-1004AC.
It is easy to measure the resistance of the coils in the motor so that can narrow it down somewhat.