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ganesan
(@ganesan)
New Member
Joined: 4 months ago
Posts: 4
2020-05-22 6:02 pm  

Greetings. I am puzzled with the current requirement of stepper motor.  The model I have is 42SHD0217-24B (2 phase bipolar). It says current = 1.5 A.  What does this really mean?

I followed Bills video, used A4988 with Arduino. Motor spin as expected. Current was at 1.5+ A.  I experimented further with micro stepping. Motor did not spin properly & stopped spinning in some micro stepping settings.  Then started experimenting by adjusting the current (connected multi-meter in series) and set the limiting current of A4988 to 0.3+ A.  The stepper motor spin as expected in all the micro-settings (half, quarter, eight and sixteenth) & for full step as well.  Please can someone explain to me why 0.3+ A worked and not 1.5 A?

Thank you.


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triform
(@triform)
Reputable Member
Joined: 1 year ago
Posts: 330
2020-05-22 6:13 pm  
Posted by: @ganesan

Greetings. I am puzzled with the current requirement of stepper motor.  The model I have is 42SHD0217-24B (2 phase bipolar). It says current = 1.5 A.  What does this really mean?

I followed Bills video, used A4988 with Arduino. Motor spin as expected. Current was at 1.5+ A.  I experimented further with micro stepping. Motor did not spin properly & stopped spinning in some micro stepping settings.  Then started experimenting by adjusting the current (connected multi-meter in series) and set the limiting current of A4988 to 0.3+ A.  The stepper motor spin as expected in all the micro-settings (half, quarter, eight and sixteenth) & for full step as well.  Please can someone explain to me why 0.3+ A worked and not 1.5 A?

Thank you.

Hi Ganesan,

Here is a great page I found and remembered 🙂  http://blog.inventables.com/p/stepper-motors.html   It gives some details on the motors, their ratings, and driving them. 

I will also warn you some of the A4988 drivers (we all buy them :0-) are not created equally.  For personal projects, I tend to not use them and get other drivers but understand that they are so cheap!

Scott  


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