<blockquote>
  <p>Since they have the same rotation angle per step, I shouldn't have to calibrate the new model, right? (I'll use the original wheel)</p>
</blockquote>

<p>Yes, you do not have to change anything, other than the Vref of the stepper driver.</p>

<blockquote>
  <p>Did the vendor send me a motor with inferior performances?</p>
</blockquote>

<p>Yes, the one you received has a lower height, so smaller coils and smaller permanent magnets; basically lower torque.</p>

<blockquote>
  <p>Will my performances degrade if I use the new motor?</p>
</blockquote>

<p>That depends on the loading of the carriage of the X-axis, it could if it is heavy; you now have less torque available to move the carriage. But, this type is frequently found in 3D printer kits and should work.</p>

CC BY-SA 4.0
2019-04-20T07:30:56.157Z
The Vref is adjusted by turning the screw of the driver right? (What I did?). I thought I was adjusting the tension because I normally measure the voltage on the driver. But I gues Ur=R.I :)
JPFrancoia
CC BY-SA 4.0
2019-04-20T21:23:55.727Z
@JPFrancoia Yes you adjust the screw and set the correct Vref according to the stepper driver type to limit current, e.g. for DRV8825 drivers it is `Stepper Current Limit = Vref × 2`.
0scar
CC BY-SA 4.0
2019-04-19T21:56:47.487Z
2019-04-20T21:17:31.450Z
2019-04-20T21:17:31.450Z
0scar
<p>Last week, my X-axis stepper motor died. It was a 42SHD0217-24B model. I ordered the same online, but the vendor made a "mistake" and sent me the 17HS3401S model.</p>

<p>I know these motors use a different voltage, so I adjusted the screw on the stepper driver and managed to get a smooth rotation with the new model. I know that these 2 motors have a rotation of 1.8° per step.</p>

<p>My questions are the following:</p>

<ul>
<li>Since they have the same rotation angle per step, I shouldn't have to calibrate the new model, right? (I'll use the original wheel)</li>
<li>Did the vendor send me a motor with inferior performances?</li>
<li>Will my performances degrade if I use the new motor? (Lecture on motors appreciated). By that I mean: will my top moving speed be affected? Will the motor miss more steps at high speed?</li>
</ul>

CC BY-SA 4.0
2019-04-19T18:37:21.077Z
can you just try it? print a benchy or something and see how it goes.
dandavis
CC BY-SA 4.0
2019-04-19T18:41:54.540Z
Yes I will obivously, but I'm looking for a more theoretical explanation, since I want to understand...
JPFrancoia
CC BY-SA 4.0
2019-04-19T21:43:02.533Z
Not voltage, but amperage (current). Due to the difference in max current, you need to lower Vref of the stepper driver.
0scar
<stepper><motor>
Replace X axis motor with different model
JPFrancoia
# Replace X axis motor with different model

(Asked by: username_0 on 2019-04-19)

Last week, my X-axis stepper motor died. It was a 42SHD0217-24B model. I ordered the same online, but the vendor made a "mistake" and sent me the 17HS3401S model.

I know these motors use a different voltage, so I adjusted the screw on the stepper driver and managed to get a smooth rotation with the new model. I know that these 2 motors have a rotation of 1.8° per step.

My questions are the following:

* Since they have the same rotation angle per step, I shouldn't have to calibrate the new model, right? (I'll use the original wheel)
* Did the vendor send me a motor with inferior performances?
* Will my performances degrade if I use the new motor? (Lecture on motors appreciated). By that I mean: will my top moving speed be affected? Will the motor miss more steps at high speed?

**Tags:** stepper, motor

> **Comments:**
> **username_1**: can you just try it? print a benchy or something and see how it goes.  
> **username_0**: Yes I will obivously, but I'm looking for a more theoretical explanation, since I want to understand...  
> **username_2**: Not voltage, but amperage (current). Due to the difference in max current, you need to lower Vref of the stepper driver.  

---

## 1 answers

### Answer by username_2 on 2019-04-19. Score: 1 | Accepted answer

> Since they have the same rotation angle per step, I shouldn't have to calibrate the new model, right? (I'll use the original wheel)

Yes, you do not have to change anything, other than the Vref of the stepper driver.

> Did the vendor send me a motor with inferior performances?

Yes, the one you received has a lower height, so smaller coils and smaller permanent magnets; basically lower torque.

> Will my performances degrade if I use the new motor?

That depends on the loading of the carriage of the X-axis, it could if it is heavy; you now have less torque available to move the carriage. But, this type is frequently found in 3D printer kits and should work.

> **Comments:**
> **username_0**: The Vref is adjusted by turning the screw of the driver right? (What I did?). I thought I was adjusting the tension because I normally measure the voltage on the driver. But I gues Ur=R.I :)  
> **username_2**: @username_0 Yes you adjust the screw and set the correct Vref according to the stepper driver type to limit current, e.g. for DRV8825 drivers it is `Stepper Current Limit = Vref × 2`.  

---

