Stepper Motor Nema 17

[thomas2251]

Hello,

A stepper motor is to be connected to an ESP32 via an A4988 board.

According to this data sheet Redirecting, the motor needs a voltage of 3.5 V at 1 A.

The stepper coils have a resistance of 4.5 ohms.

If the potentiometer is turned fully in one direction, it only creates a voltage of 1.5 volts. The A4988( https://www.oyostepper.de/goods-886-5Pcs-A4988-Schrittmotortreibermodul-mit-K%C3%BChlk%C3%B6rper-f%C3%BCr-3D-Drucker-Reprap.html ) is operated with 5 volts. Does the supply voltage need to be increased?

According to this guide Ardufocus | A4988 motor current tuning 2, you should calculate the voltage for the stepper using a formula and adjust the potentiometer accordingly.

Formula: Vref = (Imax * 0.8) * [resistance of the coil]

This results in: 1 * 0.8 * 4.5 = 3.6 volts Vref

The 0.8 stands for 80% of the power so that the heat development does not become too great.

Was this interpreted correctly?