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How to control ac servo motor?

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How to control ac servo motor?

2023-12-05 15:14:08

Precise control of AC servo motors is critical for automated systems. This detailed guide examines essential components and configuration procedures to achieve optimal motion control performance.

Servo Drive Selection and Tuning

Select a ac servo motor drive compatible with the motor and application demands. Drive parameters include voltage, current ratings matched to motor nameplate specifications. Configure operating mode such as velocity/torque control. Carefully tune loop settings including proportional/integral gains through auto-tuning or manual adjustment. Ensure robust speed regulation without oscillations across the motor and load's dynamic operating range.

Encoder Feedback Installation and Configuration

Accurate position feedback enables closed-loop control. Install high-resolution linear or rotary encoders coaxially aligned to the motor shaft with rigid couplings. Configure encoder specifications such as line count and communication interface in the servo drive/controller. Adjust settings like counting mode and multiplication factors to optimize resolution. Verify proper multiplier calibration to avoid positioning errors.

Motion Controller Programming

Program the motion controller to generate command trajectories and oversee synchronization. Define motion profiles using segments for separate accelerations ramping smoothly between velocity setpoints. Tune jerk limits, S-curves and PID gains based on dynamics to minimize position overshoot and oscillatory behavior. Implement positioning, velocity and torque control modes suited to individual tasks.

Coordinated Multi-Axis Operation

Interconnect multiple servo drives and motors under master motion controller supervision for synchronized multi-axis motions. Configure electronic camming between slave and master axes through electronic gearing or ratio-based ratio interpolation. Spline and linear interpolation routines enable complex polygonal path coordination. Carefully match servo update rates, trajectory derivatives andtransformation logic to achieve backlash-free, vibration-free sequential and coordinated group motions.

Commissioning, Calibration and Validation

Calibrate all components and tune control parameters through commissioning procedures verifying performance goals. Validate position calibration through homing routines referencing dedicated limit switches, noting deviation from theoretical values. Conduct step response tests at operational speeds/loads to evaluate tuning results. Validate smoothed trajectory execution through synchronized multi-axis profiling. Continuously monitor and refine system settings.


Adherence to these best practices enables optimal precision control of AC servo motors. Proper system configuration maximizes dynamic response while maintaining stability under all operating conditions.

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