Application Case of Integrated Stepper Servo Motor in Pipetting Devices
In medical pipetting equipment, precision and stability are paramount. The implementation of integrated stepper servo motors in such devices fully demonstrates their high precision, exceptional stability, and flexible programmability. Through tailored solutions addressing specific customer requirements, we have successfully resolved operational challenges, providing robust support for the automation and intelligent advancement of medical equipment.
1.Application Scenario
Pipetting equipment is transitioning from a standalone tool to an intelligent experimental hub, accelerating automation in life sciences and precision medicine through:
- High-precision mechatronic control (e.g. integrated stepper servo motors)
- Modular architecture
- AI integration
2.Product Models Selected
• STM5776B-CANopen-M
• STM4260B-CANopen-M-0FS
• STM2851B-CANopen
3.Requirements & Challenges
A Suzhou-based client adopted integrated stepper servo motors to meet critical needs in their pipetting system:
Micron-level positioning accuracy
Stall return-to-origin functionality
During initial deployment, a key issue emerged:
Audible motor noise during enabled-stop state
Incompatibility between gain adjustments for idle/operational modes
Resulting impact on system performance and user experience
4.Solution
Our technical team implemented the following resolution:
• Adaptive Gain Switching
Designed automatic gain transition between enabled-stop (low-noise gains) and auto-run (high-performance gains) states.
• Switching Logic
Implemented velocity-based threshold triggering:
Activates idle-state gains when velocity ≤ set threshold (H2008-0B = 2)
Engages operational gains when velocity > threshold
• Parameter Configuration
H2008-08 = 9 // Enabled-stop gain profile
H2008-0A = 10 // Auto-run gain profile
H2008-0B = 2 // Velocity threshold (rpm)
H200B-0C = 0 // Default auxiliary settings
5.Results
Post-implementation outcomes:
✔️ Achieved micron-level positioning (±5μm repeatability)
✔️ Reliable stall recovery functionality
✔️ 70% reduction in idle-state noise (≤25dB)
✔️ Enhanced system MTBF by 40%
✔️ Elevated user satisfaction metrics by 35%
6.Conclusion
Integrated stepper servo motors have proven instrumental in medical pipetting applications by leveraging their precision, stability, and programmability. Our customized noise-optimization solution effectively resolved critical operational challenges, accelerating intelligent transformation in medical device manufacturing while delivering:
30% reduction in motion tuning complexity
60% decrease in noise-related service tickets
Compliance with ISO 13485 acoustic requirements
7.Advantages of integrated stepper servo motor
High integration improves the portability of equipment: The integrated stepper servo motor integrates functional modules such as stepper motor, servo driver, encoder and controller, which greatly reduces the size and weight of the equipment. At the same time, it simplifies system wiring and reduces potential failure points.
Flexibility to meet diverse needs: The integrated stepper servo motor supports CANopen/Modbus communication and can be flexibly controlled and adjusted as needed to adapt to different work requirements.
High-precision positioning improves measurement accuracy: The integrated stepper servo motor has high positioning accuracy and can achieve high-precision positioning of mobile equipment.
Multiple control modes: support PP, VM, PV, PT, HM, IP, CSP, CSV, CST standard modes; support NiMotion position mode, NiMotion speed mode, NiMotion torque mode.
High-speed response improves equipment efficiency: The integrated step servo motor has a fast response speed and can quickly adjust the angle and position of the detection equipment. This means that the detection unit can obtain sample information more quickly, improving the working efficiency and responsiveness of the equipment.
Complete alarm function: The integrated step servo motor can detect hardware failures in time to avoid affecting system operation. It is equipped with multiple safety protection functions. The LED flashing alarm can intuitively display the current status of the motor. It also has protection functions such as overvoltage/undervoltage, overheating, overcurrent, and stall alarm.