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Brushless Motor Controller

Former Member

Hi, hopefully someone here would be kind enough to help me out or point me in the right direction or to the right place to ask this.

 

I'm working on a project requiring a BLDC motor controller for a 48V system, up to 10 amps or so continuous. Here's the catch: I can't use a premade controller or controller IC. So, I made the board attached. Essentially what happens is PWM signal (from an Arduino that's reading the motor Hall sensors. 400 Hz, not sure if it'd be beneficial to increase frequency?) comes in the jumper pins, goes to gate drivers, which then drives MOSFETs that should connect the different phases of the motor high/low as needed. It hasn't been working, and I'm not quite sure why, even after a lot of troubleshooting. Perhaps I'm trying t draw too much current and pushing the FETs outside the safe operating area? I'm a mechanical engineering student, so it's entirely possible I completely screwed something up.

 

If anyone has done something similar or has any ideas, I would greatly appreciate it!

 

P.S. The top portion of the board is just an experiment trying to convert to 12V on the board, it's not on the physical copy of the board I have.

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  • 0

    Hi Trent,

     

    What is the supply voltage (VCC)? It is 12V or so, right? (i.e. not the Arduino 5V supply).

    Also, you might want to (carefully!!) monitor the voltage on the VB pin with no motor connected, at different speeds, i.e.

    as you would if you were ramping up the motor from stop to full speed.

    Probably very worthwhile using a voltage divider there (with high resistor values to keep discharge impact low) before you connect to your scope input!

  • 0 in reply to shabaz

    The comment from should be taken to heart because your have both high direct voltage with a lot of current(power). I am guessing you are a student. Why can try with a small scaled version before going large? The learning you will get is more valuable and making mistakes less of a burden. In true learning mistakes help more than answers.

    Clem

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