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Arduino Brushless FOC Controller

A project log for 3D Printed Robot Actuator

A high speed and high torque robotic actuator using low-cost brushless motors, custom controller, 3D printed parts and bearings.

Paul GouldPaul Gould 06/18/2018 at 14:042 Comments

In an effort to make the controller accessible to more makers I've strated designing an Arduino based system. It uses the SAM D21 G 32-bit micro-controller as used on the MKRZERO board. This chip has an advanced Timer Counter Controller which can generate three centre aligned PWM signals. After sorting out the correct pin mapping it is up and running.

The code is based on information provided in the Arduino forum by MartinL.

https://forum.arduino.cc/index.php?topic=346731.0 

Now with deadband

I will create a github shortly

Next up dual SPI. One for the absolute magnetic encoder sensors and the other for the FET gate Driver IC.

PID and FOC should be easily ported across.

Voltage and current measurement may be difficult because the Arduino doesn't support free running sequential ADCs very well.

The SAM D21 does not have CAN commucations so it will need RS485 and USB.

Discussions

Paul Gould wrote 06/18/2018 at 15:37 point

In this example you are right. This is just the RAW PWM signals to make sure I could get three centre aligned PWM signals @ ~24kHz out of the Arduino SAM D21. Next is to add the Field Oriented Control code to generate the 3 Saddled Sine waves. 

  Are you sure? yes | no

K.C. Lee wrote 06/18/2018 at 15:12 point

Shouldn't the three waveforms be 120 degrees apart from each other?  The motor is stalling with what you show.

  Are you sure? yes | no