I have a bipolar stepper motor that I want to run using the DRV8834 Dual-Bridge Stepper Motor Driver. The connection schematic is correct (I followed another post) and is attached in the picture.



The resistance of both motor coils is 11Ω (measured with a multimeter). I supplied 10V DC to the Vm pin of the DRV8834 using a Keithley Triple Channel DC Power Supply (30V, 1.5A).



When I upload the code below and run the motor, it only produces a low noise. The code is attached below

#include "AccelStepper.h"
#define dirPin 2
#define stepPin 3
#define motorInterfaceType 1

// Create a new instance of the AccelStepper class:
AccelStepper stepper = AccelStepper(motorInterfaceType, stepPin, dirPin);

void setup() {
  // Set the maximum speed in steps per second:
  stepper.setMaxSpeed(1000);
}

void loop() {
  // Set the speed in steps per second:
  stepper.setSpeed(400);
  // Step the motor with a constant speed as set by setSpeed():
  stepper.runSpeed();
}

The current drawn by the motor is 0.90A (10V / 11Ω), and I set the current limit of the driver to 0.45A using the formula:



Current Limit= ref × 2



I connected a 100μF capacitor between the Vm+ pin and the Ground pin.



The problem is that when I upload the code, the motor only generates noise and does not rotate. I am confused about why it’s not rotating and is only producing noise.



The working operation of the motor, as provided by the company:

Operating the Motor:



The motor works by turning on these coils in a specific sequence.

First, Coil A is turned on, which moves the motor a little bit.

Then, Coil B is turned on, which moves the motor a bit more.

By continuing to switch between these coils in a pattern, the motor rotates smoothly.

Controlling the Speed (and Flow Rate):



Faster Pulses = Faster Motor = Higher Flow Rate: If we send pulses quickly, the motor turns faster, which pumps the fluid faster.

Slower Pulses = Slower Motor = Lower Flow Rate: If we send pulses more slowly, the motor turns slower, reducing the flow rate.

The flow rate-related file is attached in the picture.



Voltage Measurements:

After uploading the code and during the noise/buzz generated by the motor, the DC voltage across Coil A shows:



One wire: 1.9V

The second wire: 0.65V

For Coil B:



One wire: 1.9V

The second wire: 0.67V

Can someone help me sort out this issue, i failed to run the stepper motor?, the required pictures are attached below.

Your assistance would be greatly appreciated.

 

I believe you posted a similar thread recently, the difference being that you are now trying a different stepper library. I made some suggestions how to analyze the problem but we never heard back from you.

in this instance, since the motor is humming, maybe it simply won’t turn that fast. Typically a 200 step motor will only do one rotation a second and with a speed of 400 you maybe asking it to do two rotations? Maybe replace 400 in your code with 100 to check this

To check the coil sequence is correct, replace the coils with LEDs in series with 10K resistors and slow the speed right down so you can observe whether the lines are turning on and off in the right order

 

Check that you have all the correct conditions for the pins that show as not connected in your diagram. For instance, does the /En pin need to be externally connected to GND?

 

You are going way too fast.
Try one step per second, then increase it after you get it working.