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  1. #1

    Join Date
    Nov 2020
    Posts
    2

    BLDC driver using STM32F103

    Hello to everyone here.
    I recently stumbled upon very good project here:

    https://www.cnczone.com/forums/open-...28-cnc-24.html

    It seems that this thread was closed long ago .

    I am a hobbyist in electronics. Have made some small projects using Arduino. I made a working small CNC router using Arduino UNO and stepper motors.
    Now Im trying to make bigger CNC which will need higher feed rates. So I was searching for BLDC servo solution, and found it hare.

    This looks like realy good project to implement cheap BLDC motors for motion control.

    Anyway, I started to make this project.
    MCU is conecting to Servo Tuner app
    the app is showing encoder position

    But, I decided to test signal to driver stage and I get weird results. pins PB15, PB14, PB13, PA10, PA9, are HI, and PA8 is LO. This will result in magic smoke if I connect MOSFETs.

    I plan to use FDD8896 MOSFETs and drive them dirrectly from MCU. Allready tested to switch them dirrectly and works just fine.

    So can someone please help me hare?

  2. #2
    Registered
    Join Date
    Nov 2012
    Posts
    1013

    Re: BLDC driver using STM32F103

    Are you sure you have steady HI level on those pins (not high frequency PWM)? Did you check it with a scope or just a voltmeter?

  3. #3

    Join Date
    Nov 2020
    Posts
    2
    Quote Originally Posted by CitizenOfDreams View Post
    Are you sure you have steady HI level on those pins (not high frequency PWM)? Did you check it with a scope or just a voltmeter?
    Actually I checked with scope too. It gives 5 Hz with 0.8 v drop. So steady hi.

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