Application cases of integrated stepper servo motors in visual inspection equipment
In the field of industrial automated visual inspection, high-precision positioning and motion stability directly impact the accuracy of inspection results. By optimizing the control mode and mechanical structure, the STM57 and STM42 integrated stepper servo motors solve the problem of jitter during operation of visual inspection equipment, significantly improving image acquisition clarity and inspection efficiency.
1. Equipment Overview
This vision inspection system is primarily used for surface defect detection on mechanical castings. Core requirements include:
1. Motion Accuracy: Repeatability ≤ ±0.05mm
2. Dynamic Stability: No jitter during operation, preventing image blur
3. Functionality: Supports automatic origin return (HM mode) and contour position control (PP mode)
2. Application Solutions and Products
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• X-axis drive: STM5776B-CANopen-M (high-torque model, load capacity 5kg)
• Y-axis drive: STM4260B-CANopen pen-M (high-speed response model, suitable for light loads)
• Control mode: PP (profile position mode) for path planning, HM (origin return mode) to ensure calibration accuracy
• Use CANopen bus communication to achieve multi-axis synchronous control
• Match the lead screw pitch and motor resolution through electronic gear ratio optimization
3. Problems and solutions
1. Local jitter during operation: The lead screw structure vibrates periodically at a specific position
Recalibrate the parallelism of the equipment guide rail to eliminate mechanical assembly deviation
2. Jitter at the start and stop: The acceleration and deceleration impact of the motor affects the stability of visual photography
Solution:
(1). Confirm that the photo triggering sequence is not related to motion control
(2). Optimize the PP mode acceleration parameters
4. Application effect
1. Inspection efficiency: The single-piece inspection cycle is shortened to 1.2 seconds, and the production capacity is increased by 25%
2. Quality assurance: The defect recognition accuracy is increased to 99.5%
3. Maintenance cost: After the mechanical structure is adjusted, the motor PID parameters remain at the default value for stable operation
5. Summary
This case solves the key jitter problem of visual inspection equipment through the precise control and mechanical collaborative optimization of the STM57/42 series integrated stepper servo motor. This solution verifies the reliability of the integrated motor in high-dynamic vision systems and provides a standardized reference for precision motion control in fields such as mechanical manufacturing and electronic component inspection. In the future, it can be expanded to multi-camera collaborative inspection scenarios.
