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bgkatz / 3phase_integrated

3-phase motor controller with integrated position sensor
MIT License
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Going from a peak of 40A to 60A #9

Open m-opara opened 1 year ago

m-opara commented 1 year ago

Greetings Ben,

This is a very neat project! Without having dived too deeply into the inner workings of the board and BOM yet, I was wondering if you could provide some insight on what aspects of the design cause the max current draw to be capped at 40A?

I’m hoping to use this as a start for a project I’m working on and ultimately would like to allow for a peak of 60A and wanted to make sure I didn’t miss any of the details needed to do that.

Thank you for your time!

bgkatz commented 1 year ago

The latest firmware actually supports limits up to 75A peak. Above 40A the DRV8323 current sense amplifier gain has to be reduced. Thermally the drive's good for 30-ish amps continuously with a little heatsinking. I tested 60A, 1s pulses at a 20% duty cycle a while back, and recently I've run the drive up to 75A for ~100ms pulses.