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Application case of STM2832A integrated stepper motor in automatic centrifuge
Release Date : 2020-02-19 18:04:13

A centrifuge is a machine that uses centrifugal force to separate components from liquid and solid particles or a mixture of liquid and liquid. It is mainly used to separate solid particles from liquid in suspension, or to separate two liquids of different density in emulsion, which are incompatible with each other (such as separating cream from milk); it can also be used to remove wet solids Liquids in the washing machine, such as drying clothes by using a washing machine; special ultra-speed tube separators can also separate gas mixtures of different densities; the use of solid particles of different densities or particle sizes with different sedimentation speeds in the liquid, and some sedimentation centrifuges Solid particles can also be classified by density or particle size.

Application case on STM2832A automatic centrifuge

As everyone knows, serum separation is a difficult problem. So how to separate the serum with a centrifuge? First of all, we analyze from the concept of serum: blood serum: the liquid that is precipitated after blood coagulates. The essence of blood coagulation is that soluble fibrinogen in plasma is transformed into insoluble fibrin. Fibrin is filament-like, intertwined into a network, collecting a large number of blood cells, forming a gel-like blood clot. 30 minutes to 1 hour after hemagglutination, the platelet contractile protein in the blood clot shrinks, making the blood clot retract and harden, and squeezes a clear liquid called serum. The difference between serum and plasma is that serum lacks fibrinogen and participates Hemagglutination factor, but also adds a small amount of material released by platelets during coagulation. Then I analyze the general situation from the purpose of serum separation: Let it stand at room temperature (37 degrees) for more than half an hour, open the centrifuge, and centrifuge at 3500-4000rpm for 5-10 minutes to isolate the serum. Fully automatic positioning to the set position to be inspected. If measuring easily degradable indicators such as enzymes, place them at 4 ° C for more than half an hour, and centrifuge. (The purpose of being placed at 37 degrees for a period of time is to allow the blood to coagulate and precipitate serum, because after blood coagulates, fibrin shrinks and the serum can precipitate.)


Serum centrifuge

Supported operation modes: Position mode, speed mode, origin return mode
Support fault diagnosis: overvoltage, undervoltage, overheating, overcurrent, stall, etc.
Digital input and output: Digital output (open drain, max. 100mA), digital input (5 ~ 30VDC)
Timing time: up to 999min
Positioning accuracy: better than 0.2 °
Degree of automation: fully automatic
Noise: <55dB
Application areas: Widely used in hospitals, blood stations, blood banks, universities, biological engineering, molecular biology, pharmaceutical factories, teaching and research experiments, agricultural science, video detection, environmental protection and other fields.


STM2832A integrated closed-loop stepper motor

♢ STM2832A integrated closed-loop motor is a highly integrated motor that integrates motor, driver, controller and encoder. Its volume is 28mm * 28mm * 46mm, which reduces the size of the centrifuge by 50% compared with the motor used in conventional centrifuges.
♢ The motor integrates a 1000-line encoder, and the positioning accuracy is better than 0.2 °, helping customers to achieve fast and accurate positioning after automatic centrifugation, without recalibrating the sample inspection position after centrifugation, which facilitates the automatic inspection of samples after centrifugation.
♢ Adopting closed-loop control, internal planning acceleration and deceleration, and S-type acceleration, while meeting the speed requirements, it has a smooth starting characteristic and prevents sample splashing.
♢ Modbus communication: It can start and stop the motor and set the centrifuge timing. Customers can also read the motor position, diagnosis and other information in real time.
♢ Parameters can be changed at any time during operation without stopping

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