I have purchased multiple MP6500 carrier boards and plan on purchasing more if I can fix this issue I am having.
I have hooked up this board as seen in the recommended minimal wiring diagram on the product page. I am using a 12V. Power Supply. I am full stepping a 12V, 2A, Neema 17, bipolar, 1.8 step angle, Stepper Motor (Moons is the manufacturer - MS17HD6P4200).
The motor when in a hold state (No rising edges on STEP pin) has a very whiny and annoying noise coming from the motor. In my application, I cannot have this. After attaching an oscilloscope to the input 12V power supply signal, it looked pretty clean and I don’t believe this is causing this audible signal frequency. Upon hooking up an oscilloscope to one of the motor output pins, there is a periodic sinusoidal 100Hz, 300mV PP waveform. Upon going through the datasheet, I am unable to diagnose why this signal is in the audible range. I understand why there should be a slightly varying signal in order to hold the stepper motor in place, but why is this in the audible range?
Also, I am trying to maximize the speed of the motor. So far I am only able to run the stepper motor at around 750 us - 800us a step before the motor stalls. Is this about as fast as I’m able to run a stepper motor? If you have any advice as far as configuration of the MP6500 to increase speed other than varying the potentiometer, please let me know.