Application of integrated stepper servo motor in automatic liquid handling workstation
With the rapid development of industrial automation, automatic liquid handling workstations are playing an increasingly important role in medicine, food, chemical and other fields. As a kind of highly integrated driving element, the integrated stepper servo motor has the characteristics of high precision, high speed and high stability, and is widely used in automatic liquid handling workstation.
This paper will introduce the application and advantages of integrated stepper servo motor in automatic liquid handling workstation in detail.
01. Introduction
Automatic Liquid handling workstation
With the development of industrial automation, traditional pneumatic systems are gradually replaced by electrified integrated drive systems in automatic liquid handling workstations.
Automatic liquid handling workstation is simply composed of the following parts :
Sampling system: used to extract a liquid sample of a certain volume from a liquid container. The commonly used electric self-pipette can be controlled by the motor speed and time to achieve quantitative sampling.
Distribution system: The sampled liquid is distributed to different detection containers. Usually an electrically controlled vertical multi-channel distributor is used, which can be allocated to containers with different barcode labels.
Detection system: The distributed liquid sample is detected and analyzed, and the automatic take-and-place device matched with the detection instrument is adopted.
Transmission system: Transporting samples and reagents between different stations for sampling, distribution, testing, etc.
Control system: collect station status signal, control the actuator to complete the automatic workflow.
Software system: Configure the control logic of sampling distribution and transmission to complete automatic operation.
02. Application Scheme
Automatic liquid detection unit in automatic liquid handling workstation
In the liquid detection system, the integrated step servo can achieve high-speed accurate positioning, quickly achieve stable sampling and distribution process, and improve detection efficiency.
Motor model:STM2832B
Contour position mode/Contour torque mode/origin regression mode
Three motors are controlled by single chip microcomputer, one motor drives the tray to move, one motor lifts the disc in the tray in torque mode, and one motor uses friction to make the disc move at 15° position and the origin regression, so that the 24 holes in the disc are facing the spectral sensor.
【 Advantages of Integrated stepper servo motor 】
High integration improves device portability: The integrated stepper servo motor integrates functional modules such as stepper motor, driver, encoder and controller, greatly reducing the volume and weight of the device. At the same time, simplify the system wiring and reduce potential points of failure.
Flexibility to meet diverse needs: The integrated stepper servo motor supports CAN/CANopen/Modbus communication, which can be flexibly controlled and adjusted according to needs to adapt to different work needs.
High-precision positioning to improve measurement accuracy: The integrated stepper servo motor has high positioning accuracy, which can achieve high-precision positioning of mobile devices.
Multiple control modes: Support PP, VM, PV, PT, HM, IP, CSP, CSV, CST Standard mode; Supports NiMotion position mode, NiMotion speed mode, and NiMotion torque mode.
High speed response improves equipment efficiency: The integrated stepper servo motor has a fast response speed.
Perfect alarm function: integrated step servo electrical self-test diagnosis, can detect hardware faults in time, avoid affecting system operation equipped with a variety of safety protection functions, through the LED Flashing alarm, visual display of the current state of the motor, while with overvoltage/undervoltage, overheating, overcurrent, gridlock alarm and other protection functions.
