What Causes High Pitched Hissing Noise in 3D Printer Stepper Motors at 0.95V?

Hello:) new here.


I am working on my new 3d printer and i came accross an interesting situation. According to the manufacture, my stepper motors need to have a voltage of roughly 0.95 volts.



I checked mine and they were 0.81 volts, hence the not so smooth prints. Ok, so i increased to the recomended specs they told me to. Now the most fasinating thing has happened and i do not know if its just me or what.


But when i power the machine on, home it to its home posistion, once the motors have stopped moving, i can hear this low volume high pitched sound like a hissing sound. I sometimes hear this same sound with other electronic devices as well, such as my wallwort for my cell phone, or my gpu in my PC. the apartment is a new complex and the power is clean and grounded.



What is this sound and should i be worried. I mean, others cant hear it but i can. Its high pitched haha


thanks

Hi Matt-My guess is that your stepper driver may be regulating current by "chopping" the voltage on and off very quickly.  This is often done at a frequency around 10-20 Khz, which might account for why some people can hear it and others can't.If it's not that, it could be that the DC supply that is feeding the stepper driver is going into current limit mode.Either way, I don't think it's anything to be concerned about unless you find that the motors or drivers are overheating.-Rick 

A little more... As Rick says, your motors are being fed by chopped or pulsed DC, at a frequency you can hear. The reason you can still hear the noise when the motors are at rest is that it is common to keep a current in a stepper motor when at rest, to stop whatever it is driving from moving.  If you remove the drive to the motor, you will be able to easily move it.As Rick says, not a big deal (except for your ears!).  At 62 I can't hear above 11 KHz, so it'll get better as time goes on

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