. Hello. My task is to provide high-repeatability precision keeping one instantaneous speed = 3000 ob/min brushless DC motor; on shaft of motor is big moment of inertia for smoothing rippling of speed; load is ventilation; brushless DC motor Maxon 118889(no-load speed 11000 ob/min, number of pair poles = 2); acceleration is smooth (1minute – 3000 ob/min); brake action is running-out; reverse is not necessary. Configuration systems: control from computer GUI, DRV8308EVM, brushless DC motor Maxon 118889, 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). Because? How is avoid this? LOCK is settled. Why LOCK isn’t reflected change of speed of motor? The task is controlled instantaneous speed of motor. Can this task realize DRV8308 (SPEEDTH, LOCK,…)? I read datasheet DRV8308 and I think SPEEDTH is half ripple amplitude speed of motor, but explain please on which algorithm realize control of speed motor (SPEEDTH, LOCK,…); what is SPEEDTH? Which are parameters DRV8308 recommend to tune for realization high-repeatability precision keeping one instantaneous speed motor(ADVANCE, PWMF,…)?
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