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Increase speed motor when the speed of task is constant(system DRV8308EVM+motor)

Aleksei Sporyagin
Prodigy 200 points
Other Parts Discussed in Thread: DRV8308EVM

Hello. Configuration systems: control from computer GUI, DRV8308EVM, brushless DC motor Maxon 118889(no-load speed 11000 ob/min, number of pair poles = 2), moment of inertia= moment of inertia motor. Motor is controlled from computer GUI v1.2 in open-loop system (open-loop PWM or speed register). The speed of motor is increased in open-loop system (open-loop PWM or speed register) when the speed of task is constant (3000ob/m).Maximum increase 100ob/m. I measured speed 3 ways : laser tachometer, frequency counter, oscillograph.  Because? How is avoid this?