Development Model of the Micro-Actuator Based on a Coreless Motor for Electronic Medical Pipette

Medical pipette with electronic control is an important and indispensable modern device. The paper analyzes the importance of the use of regulated electronic medical pipettes in medical and associated fields. Modern approaches to the development of their micro-electromechanical actuator are outlined. Developing an appropriate mathematical model is necessary for improving the design and control system of the electronic medical pipette, which requires the parameters of the micromotor, most of which are missing from the manufacturer’s descriptions. At the first stage, a model for a 610 series coreless motor $(6 \mathrm{~mm}$ diameter, 10 mm - length) for supply voltage ($3.0-3.7 \mathrm{~V}$) was developed and researched using a specialized package for designing and simulating electromechanical systems JMAG Designer. With the help of the model in JMAG Designer, some of the necessary parameters of the coreless motor are determined. At the second stage, an algorithm was developed and practical experimental studies of the 610 series coreless motor were carried out in order to obtain all the necessary parameters for the further development of a high-precision model. Based on the experimental results, the transfer function was obtained, a high-precision model of the coreless motor was developed in MATLAB, and the corresponding current and speed transition processes were obtained, which confirmed the accuracy of the obtained model. The transition process of the current on the model in case supplied with a voltage of 3.7 V coincided at the operating point with an error of $8.1 \%$, the speed of rotation of the motor coincided with an error of $5.7 \%$. A model of an electric microdrive based on a coreless motor for an regulated electronic medical pipette was developed and its operation was investigated.