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Illustration of Innovative Application of Magnetic Heating Stir

Author: 张育霞;程芳卉
Source: 身边物品在中学物理实验中的巧用

The heating magnetic stirrer is mainly driven by the electromagnetic effect to stir the stirrer and heated by the thermal effect of the electromagnetic. Its working principle is to control the speed of stirring and the temperature of heating by controlling the size of the current. The magnetic heating stirrer (as shown in Figure 1) is a special instrument used in the laboratory to heat and stir liquids. The stirring principle is to use the characteristics of magnetic substances that repel each other with the same sex and attract each other with the opposite sex, and drive the strong magnet to rotate through an adjustable-speed DC motor, thereby continuously changing the polarity at both ends of the base to drive the magnetic stirrer to rotate. For liquids or solid-liquid mixtures that are not very viscous, put the liquid into the container and then put the stirring bar at the same time, and the stirring bar will sink to the bottom of the container. When the base generates a rotating magnetic field, it drives the stirrer to rotate, and the rotating stirrer drives the liquid to rotate, so as to achieve the purpose of stirring the liquid.


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