Nema 17 2A holding torque

Official Hardware Opta
1

Hello,
I am driving a Nema17 2A 17HS19-2004S1 with a a4988 driver on a CNC shield.
It's for a robot's arm joint so i need the stepper to have the maximum torque all the time, even when stopped.
I wanted to know if the a4988 driver limits the output current to the motor when idling (like reducing by 50% like other drivers do, for example DM542T has the option). If so how to disable this option.
By the way the only option i have on the driver to set the output current is potentiometer ? I need to set to 2Amps then.

A4988 :

Stepper :
https://www.omc-stepperonline.com/fr/nema-17-bipolaire-59ncm-84oz-in-2a-42x48mm-4-fils-avec-1m-de-cable-et-connecteur-17hs19-2004s1?srsltid=AfmBOor6RkLECpF04eFy4hcKxSsT0ySeE9D-mls9ZoozcOCcJ8WRJivp

2

The A4988 is not suitable for that motor, as it can handle at most 1 Ampere per winding, at half the rated torque.

Buy a driver that can easily handle more than 2 A per winding.

1 Like
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So here +/-2A is IN TOTAL ? for both windings.

4

That is the absolute maximum current. Never operate devices at or above their absolute maximum rating.

With the A4988, if the steady state current exceeds about 1 Ampere per winding, the motor driver will overheat and shut down.

5

To do that requires maximum voltage that the controller can handle. Be sure to mount the stepper motor in metal that can help to dissipate the heat from the motor.

6

Which one is suitable then ? DM542T ?

7

Any current limiting stepper driver than can easily handle more than 2 Amperes per winding should be fine. Do your research!

8

Any stepping motor provides the maximum holding torque when it is stopped. It often surprises people to know that a stepping motor draws maximum current when it is stopped.

Any movement of a stepping motor causes the current draw to reduce.

9

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