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VESC Tool Reporting RPM Different from Scope

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bayetan
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VESC Free
Joined: 2019-08-30 02:40
Posts: 6
VESC Tool Reporting RPM Different from Scope

Hello All,

I/m running VESC FW 5.02 and FS Dual 6.6 with an ABI Encoder on motor with 21 Poles.  The eRPM reported by VESC Tools is about 60 eRPM higher than value measured using a Logic Analyzer (using period of the Index channel).  That ~60 eRPM difference remains at higher RMP as well.  And the "Sensorless ERPM" on the Encoder Tab is set to 25,000.  I realize that's a small difference but I'm trying to control to very small speed and would like to know if anyone can get me some help resolving it.

eRPM reported by VESC Tools is 8000 eRPM

eRPM  measured is 21 * 60 / 0.158564 = 7946 eRPM

Thanks,

Ben