5. What are servo motor current, velocity and position loops and bandwidths?
Servomotors operate in a closed-loop system, which includes a feedback device, a drive (amplifier), and a controller. The controller uses output from the feedback device to compare the commanded value (position, velocity, or torque) to the achieved value and issues commands to the drive to correct any errors. This process of monitoring feedback and making corrections is referred to as a control loop. Depending on the application and performance requirements, a servo system can include any combination of three types of control loops: a position loop, a velocity loop, and/or a current loop.
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