Development of AMB Test Unit for the Numerical Model Validation

Abstract

The paper presents the results of the experimental testbed unit creation, its testing results, and the simulation results of a developed numerical model. The experimental testbed unit is an axial magnetic suspension of the rotor with two axial electromagnets. The main purpose of the testbed unit is to test the results of the developed numerical finite element model. The automatic control system was developed for the experimental testbed unit. The electrical circuit was assembled based on the ESP32 microcontroller with a clock rate of 240 MHz and PWM with a bit capacity of 10 bits. The PID-controller program was developed. The coefficients kP, kD, kI used in the code of the system control program (PID-controller) were tuned. An experimental study of the load bearing capacity of the axial active magnetic bearing under the influence of external axial force was conducted. The required power consumption of the axial active magnetic bearing was determined. The maximum load-bearing capacity of the testbed unit for the selected coefficients of the PID-controller was determined. An axisymmetric finite-element model of the axial active magnetic bearing was developed in the open-source program FEMM 4.2. The load-bearing capacity of the testbed unit for a given current intensity value was calculated. The results of the numerical modeling were compared with the experimental data obtained. The basic principles of creation and operation of the experimental testbed unit and its numerical model were described.