FOCCurrentSensor board

hardware support
1

Hey all! I’ve been having issues with current sense accuracy in my application (motor running unloaded at 730rad/s+ with currents typically around 30mA). I haven’t been able to get optimal results with the SimpleFOCShield or with the ESP32s3 internal ADC so I’m designing a dedicated current sense board:

  • 3 x INA240 current sense amplifiers
  • MCP3462R ADC with SPI interface

With the right choice of shunt resistors I’m hoping for <1mA of precision, bandwidth of 20kHz at a 40kHz loop rate.

Keen for any thoughts on the design! Once it’s finished I’ll publish the project on EasyEDA so hopefully it might be of use to people:

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2 Likes
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If you build it, please let us know how it works out. We don’t support SPI based analog in at the moment, but it would be an interesting feature…

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It’s hard to comment on this without knowing the expected current range of operation of the motor but it looks like a good plan.

I am also using an ESP32S3 with the SimpleFOC Shield v3 and currently following the steps to get my motor up and running. I hope it actually works, as I bought it in good faith thinking the ACS712 current sensor was on the board because it was actually suitable!