Better accuracy eliminates positional errors
Open-loop stepper motor systems are valued for their ability to accurately position the load without a feedback mechanism or closed-loop control system, but only if the open-loop system has sufficient torque margin so that no position occurs during normal operation. error. To improve accuracy and for a more robust system design, the servo position loop that closes the feedback from the high resolution encoder allows the closed loop system to automatically compensate for the increase in torque demand that would otherwise cause positional errors in the open loop system. This greatly improves overall system accuracy, especially for highly dynamic applications such as pick and place systems and 3D printers that require short periods of time, fast movements and frequent changes in direction.
Dynamic torque comparison between StepSERVO closed loop (peak torque), StepSERVO closed loop (continuous torque) and open loop (available torque). These figures show the peak and continuous torque ranges for a closed-loop stepper system and the available torque range for an open-loop stepper system. The maximum acceleration of the open loop system output is 1,000 rev / sec 2 and the maximum speed is 10 rev / sec (600 rev / min). The maximum rotational speed of 10 rpm is related to the position at which the flat portion of the torque-speed curve ends.
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