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Found a very old brushed DC shunt machine. The nameplate of the motor is attached. The given RPM on the nameplate is RPM: 750/2250. Does it mean the rated speed is 750rpm or 2250rpm? Or, do you have other opinon?
That's true that one speed is exactly 3 times the other. May be it was modified in the past but currently it has no gearbox or adjustable pulley. It's still working at the moment, and it's used as a "passive" load (i.e. a generator) to test a permanent magnet brushless motor. At the moment the system is driven at speeds less than 750rpm. I wish to drive the system up to 1500rpm or higher and am worried the brushed DC shunt machine will be damaged (mechanical failure) at 1500rpm.
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