A servo drive is the power-electronic controller that regulates the current, velocity, and position of a servomotor by closing feedback loops on encoder or resolver signals. It converts commanded setpoints from a motion controller into precisely modulated motor currents, enabling high-bandwidth, high-accuracy actuation. It is a core component of industrial robot joints and CNC motion systems.
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- Drives typically implement cascaded PID or model-based control with field-oriented commutation for brushless motors. Performance is set by loop bandwidth, switching frequency, and feedback resolution, which together determine the smoothness, stiffness, and tracking accuracy of robotic motion.