I am attempting to hook up a Nema 11 1.8 degree 3.8 Volt stepper motor to a A4988 Controller board, however, I could not find much about this online. Does anyone know how to go about this? Any tips about the motor and its functionality are also welcome.
I pasted the link to the motor below.
Really no difference between connecting a NEMA11 or a NEMA17. The NEMA is only the physical size and mountong dimensions. It has nothing to do with the electrical specifications.
The A4988 requires a minimum of 8V motor suppy voltage. The 3.8V listed is not relevant at all. The higher the suppy voltage, the greater the available torque and speed, up to the limit of the driver.
One must set the coil current imit correcty before using the motor. The A4988 is good for 1A without a heat sink and up to 1.5A with heat sink and active (fan) cooling. There are many instructions on the net for setting the coil current. Be sure to use the correct value of sense resistors in the calculation.
Polou A4988 page. https://www.pololu.com/product/1182. Note that the sense resistors on most Chinese clones are 0.1 Ohms..
Ok thank you! I will make sure to read the article as well.
Just to be clear, what does the 3.8 indicate exactly, and will my motor get burnt up if I add a higher voltage such as 8 volts?
When connected to the A4988 stepper driver the motor will NOT work with less than 8V motor supply. Supply voltage higher than 8V will enable higher torque and speed up to the 35V max allowed by the driver.
I am not sure why they incude the 3.8V in the specification. It is really irrelevant when interfacing with the A4988 driver. The
important spec is the max coil current. The driver will (if properly set up) regulate the coil current no matter the motor power voltage.
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