Application case of integrated servo motor in bacteria picking equipment (automatic colony picking i

In the medical device manufacturing industry, bacterial picking is a critical process for ensuring the safety of sterile medical devices. The PMMP40 series integrated servo motor is used in the automated colony picker. Through precise control in CSP (Cyclic Synchronous Position) mode, it overcomes the limitations of traditional bacterial picking equipment, including insufficient positioning accuracy and poor operational stability, significantly improving the accuracy and efficiency of bacterial strain isolation.

1. Equipment Overview

The automated colony picker is an automated laboratory device based on high-precision mechanical devices and image recognition technology, primarily used for the precise picking and transfer of microbial samples. Its core function is to identify colony characteristics using a color CCD camera, combined with precise positioning using an XYZ mechanism, to achieve efficient, low-contamination colony picking.

Core requirements include:

1. Micron-level positioning accuracy: Picker movement accuracy must be ≤ ±10μm

2. Integrated device: Reduced device size

3. Fast response: Single picking cycle ≤ 0.8 seconds

4. Networked (automatic) control: Bus control

2. Application Solutions and Products

• Integrated servo motor model: PMMP4010D-COE (100W multi-turn absolute, built-in multi-turn absolute encoder, CANopen protocol)

• Control mode: CSP mode (high-precision closed-loop control of the picker movement trajectory)

• Drive mechanism: Directly connected precision ball screw, repeatable positioning accuracy of ±5μm

• Communication: The CANopen bus communicates with the Omron PLC, enabling real-time interaction of motion commands.

3. Problems and Solutions

ProblemSolutionProblem 1: PLC initialization error: The motor is not connected to a battery, causing a PLC initialization errorEnabling the motor's built-in encoder power management function eliminates the need for an external battery

4. Application Results

• Improved Precision: Picker positioning accuracy reaches ±8μm, increasing the bacterial strain isolation success rate to 99.2%;

• Enhanced Stability: Continuous 24-hour trouble-free operation improves the equipment's Overall Effectiveness (OEE) by 35%;

• Simplified Maintenance: The integrated design reduces the overall size of the equipment and reduces peripheral wiring, reducing the failure rate by over 60%.

5. Summary

The use of the PMMP40 integrated servo motor has achieved a breakthrough in the precision and reliability of the bacterial picking equipment. This case demonstrates the technical advantages of multi-turn absolute servo motors in sterile environment equipment, providing a reusable technical solution for automated medical device production. Future applications can be expanded to biomedical fields such as PCR testing and cell sorting.