Application of 8mm miniature slider stepper motor in blood tester

The application of 8 mm miniature slider stepper motors in blood testing machines is a complex problem involving engineering, biomedicine and precision mechanics. In blood testers, these miniature slider stepper motors are primarily used to drive precision mechanical systems to perform a range of complex blood analysis tasks. The following is a detailed description of its working principle and application:
I. Working Principle
The 8 mm miniature slider stepper motor is a special type of motor whose working principle is mainly based on the law of electromagnetic induction and the interaction of the magnetic field on the current. Specifically, a miniature slider stepper motor consists of a stator and a movable rotor. The stator usually contains multiple excitation coils, while the rotor has one or more permanent magnets. By applying a current to the excitation coils in a particular sequence, a magnetic field can be generated which interacts with the magnetic field of the rotor’s permanent magnets to drive the rotor.


In a blood test instrument, the stator of the miniature slider stepper motor is usually fixed to the frame of the instrument, while the rotor is connected to a slider which slides on a guide rail. When the stepper motor receives a command from the control system, it will rotate in a specific step and convert the rotation into a linear motion by means of a slider, thus driving the mechanical parts connected to the slider (e.g., syringes, sample processing modules, etc.) to perform precise displacements.
II. Applications
In the blood test instrument, the application of 8mm miniature slider stepper motor is mainly reflected in the following aspects:
Sample handling: the mechanical system driven by stepper motors allows precise aspiration, mixing and transfer of blood samples. For example, when blood typing or specific blood chemistry tests are required, the stepper motor can drive a robotic arm to move the sample from the storage area to the testing or washing area.


Reagent Addition: When performing blood analyses, it is often necessary to add specific reagents to promote a chemical reaction or change the pH of the sample. A mechanical system driven by stepper motors accurately measures and adds these reagents to ensure accurate analysis results.
Temperature control: Some blood tests require tight temperature control, such as specific enzyme reactions or immunoassays. Stepper motors allow for precise temperature control by precisely controlling the displacement of a heat or cold source in contact with the sample.
Automated calibration: To ensure the accuracy of test results, blood tests need to be calibrated on a regular basis. A mechanical system driven by stepper motors can precisely move the calibrant to simulate the conditions of the actual test, thus improving the efficiency and accuracy of the calibration process.


Mechanical positioning: When performing blood analysis, it is necessary to ensure that various mechanical components (e.g. microscope cameras, laser emitters, etc.) are precisely aligned with the target position. Stepper motors can fulfil these high-precision positioning needs by precisely controlling the displacement of the components.
In addition, the application of 8mm micro-slider stepper motors in blood testing instruments is also reflected in the reduction of instrument costs, improvement of testing efficiency, and reduction of instrument size. For example, through the use of stepper motors, the modular design of the instrument can be realised, which is convenient for the maintenance and upgrading of the instrument; at the same time, due to the precise control ability of stepper motors, the demand for high-precision transmission parts can be reduced, thus reducing the cost of the instrument.


The 8 mm miniature slider stepper motor plays a vital role in blood testing instruments. Its working principle is based on the law of electromagnetic induction and the interaction of the magnetic field on the current, and it achieves precise control of the mechanical system by converting rotation into linear motion. In the practical application of blood tester, stepper motor is mainly used to drive the precision mechanical system to complete the sample processing, reagent addition, temperature control, automated calibration and mechanical positioning and other tasks, which improves the detection efficiency and accuracy. At the same time, the use of stepper motors also reduces the cost of the instrument and promotes the popularity and development of blood testing technology.

Post time: Jan-18-2024

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