High-precision control method of electronic pipettor

Abstract

The invention discloses a high-precision control method of an electronic pipettor. The high-precision control method comprises the following steps of: S1, calculating a corresponding motor rotation turn number N according to the volume of liquid to be transferred; S2, setting the number N3 of running turns of the motor at a preset low speed V2 and the braking overshoot N4 corresponding to the preset low speed; S3, monitoring the number N1 of rotation turns of the motor in the initial stage and the real-time rotating speed V1 of the motor in real time, and calculating the number N2 of rotationturns required when the motor decelerates to a preset low speed V2 in real time; and S4, judging the relationship between N1 + N2 + N3 + N4 and the total number of turns N in real time according to the monitored number of turns N1 and the real-time rotating speed V1 of the motor in the initial stage. According to the high-precision control method of the electronic pipettor, braking is carried outin a low-speed state, so that the overshoot can be effectively controlled, the influence of the overshoot on the outside is reduced to the minimum, and the precision, stability and consistency of themachine are effectively improved.

Description

technical field [0001] The invention relates to the field of pipettes, in particular to a high-precision control method for an electronic pipette. Background technique [0002] The pipette is mainly used for pipetting and distributing liquids, and is the most commonly used instrument in the laboratory. The pipetting accuracy of the pipette has an important influence on the experimental results. In the use of traditional manual pipettes, the operator's operating experience and proficiency have a great influence on the accuracy and stability of the pipette; while electronic pipettes are controlled by programs, which have higher precision than manual pipettes. , good stability and many other advantages. At the same time, the pipetting speed can be precisely controlled by the software, and can provide a variety of pipetting speed options, so it is generally favored by users. For electronic pipettes, the precision control of pipetting is mainly achieved by controlling the stop a...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: 1. The electromagnet realizes the expansion and contraction of the brake lever through the principle of electromagnetic conversion, and achieves the purpose of controlling the motor to stop, but the electromagnet is large in size and needs to occupy a large installation space; in addition, the electromagnetic brake The power consumption of the battery-powered pipette is relatively large, and the use time of the battery-powered pipette is greatly limited, which is difficult for the experimenters to accept; 2. Because the code disc with grooves often acts as a brake notch and an encoder of the motor , at the same time, it must be fixed with the motor, which increases the difficulty of the structural design of the product; 3. The action principle of the electronic brake is similar to that of a mechanical brake. The more times it is used, the greater the impact on the life, stability and reliability of the machine

Although this method takes the overshoot of the motor into consideration, it is difficult to determine the overshoot of the motor directly braking at high speed due to the influence of temperature, mechanical wear and many other factors, and the whole machine shakes too much after braking for a moment, which affects the operation. The comfort and grip of the operator, so there is still room for improvement in improving the accuracy of the pipette

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