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How to Interface a 4-Wire Vacuum Suction Motor from a Vacuum Robot with a Raspberry Pi?

This is a vacuum suction motor from vacuum robot that am trying to interface with Raspberry Pi. It has 4 wires and am not able to get it working. Any suggestions on wiring
file0.jpgfile1.jpg

  1. JeremyCook#0000

    Hi, given the four wires, perhaps it is controlled like a BLDC (brushless DC motor). I haven’t worked with them much if any, but I believe they typically have three coils that need to be energized, and maybe the fourth wire is a ground? That might be a good place to start, and controllers for such devices are readily available.

    A stepper comes to mind too, but those are generally lower speed so a vacuum would make less sense, but the way they work is similar.

    So maybe search for soemthing like “BLDC control with Raspberry Pi?”

  2. codetiger#0000

    If you look at the 2nd picture, it is marked as VCC, GND, PWM and *fg. I tried with first 3 pins and gave rpi pwm but didn’t work. I think the 4th one is enable pin. But tried supplying 3.3v constant on both pwm and enable bot that didn’t work. Assuming most BLDC are 5v, I tried 5v as well and that didn’t work.

  3. codetiger#0000

    Most likely there is a sequence I should follow or the driver expects a particular frequency in pwm

  4. JeremyCook#0000

    Ah, OK, well that makes sense then that it would need PWM.

    Did you test the motor in its native configuration before hacking it? I always try to do that to make sure I’m not trying to beat a dead horse so to speak (wow, that is a rather cruel idiom, not that I type it out).

    Wonder what the input/voltage current requirements are?

    Also, PWM can have different duty cycles, so maybe consider trying different timings? For that matter, something like a hobby servo uses what’s generally called a PWM input, but it’s actually a bit different than normal PWM from my understanding timing-wise. Perhaps that woudl be another avenue of experimentation.

    Good luck, I am curious to see what you find out!

  5. codetiger#0000

    I tried different PWM duty cycles from 20 to 50K Hz but no luck. My doubt is whether there is a sequence to follow. My next test is with frequency varying PWM. I’ll keep updating here about the progress.

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