Well technically zero rpm, but that's assuming that the cabling can deliver that power, the silicon shouldn't care until it hits the amp or heat limits. after that the motor tends to overheat. At these power levels, stuff gets hot fairly fast
You're pushing maybe 350 amps at this level? FWIW, my DC series Kostov has an armature max amps of 440 @192 v for 1 minute and the klick brush sensor fires at 220C
Should be a readable table somewhere that you can modify but that's above my pay grade
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