Mike,
I think you might be comparing stepper motor performance to servo, that is, steppers tend to crap out and get weak when they are really going fast.
Servos do not have this limitation. They will run the nameplate rpm if you can supply the voltage. You will not be harming the motor by doing so.
The one consideration is the actual ramp up time to get the motor from a standstill to 7500 rpm, but this is usually not a major problem
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