Transients in the electromagnetic actuator with the controlled supplier

A calculation of transients in the electromagnetic actuator with the controlled supplier has been presented in the paper. The magnetic field model of the actuator has been created with using the finite element method (FEM) and verified experimentally. The mathematical models of the supplier and controller have been coupled with the field-circuit model of the actuator using Matlab/Simulink package. The circuit parameters have been obtained from the FEM calculations. The algorithm of the proportionally-integral (PI) controller operation has been implemented. The transients of position, current and force, for different controller parameters, have been obtained. The calculation results have been verified by the measurement tests

Field-circuit modeling of AMB system for various speeds of the rotor

The non-symmetrical twelve poles active magnetic bearing (AMB12) actuator has been considered. We also included the control system for the computer simulation. We have used the field-circuit method modeling included under various speed of the rotor. The electromechanical equation system has been solved taking into account the integral parameters obtained from Finite Element Method (FEM) analysis of the magnetic field. We verified the calculations by the measurement tests under various values of the rotational speed of the AMB rotor. A good agreement has been achieved

Field analysis & eddy current losses calculation in five-phase tubular actuator

Field analysis including eddy currents in the magnetic core of five-phase permanent magnet tubular linear actuator (TLA) has been carried out. The eddy currents induced in the magnetic core cause the losses which have been calculated. The results from 2D finite element (FE) analysis have been compared with those from 3D calculations. The losses in the mover of the five-phase actuator are much lower than the losses in its stator. That is why the former ones can be neglected in the computer aided designing. The calculation results have been verified experimentall

An enhanced dynamic simulation model of a hybrid magnetic bearing taking account of the sensor noise

The paper presents simulation and experimental verification of the hybrid magnetic bearing (HMB) performance characteristics. It has been demonstrated that the additional errors from the eddy current sensors have a significant impact on the control signals. An improved mathematical model combines a nonlinear magnetic equivalent circuit of the HMB with the ordinary differential equations of its transients. These equations describe the rotor motion and the electric circuit of the system, as well as the control system required for stable levitation of the rotor. Certain harmonics have been observed in the displacement signals of frequencies equal to the multiples of the cylinder rotations. The calculation model has, therefore, been improved, taking into account the interference of the harmonics. Simulation results were validated by comparing the time responses of the transients obtained from the numerical calculations with those measured on a real object; a satisfactory agreement between the results has been achieved.</p

A dynamic simulation model of a hybrid magnetic bearing

This paper proposes a model of a hybrid magnetic bearing for simulations of transient performance. It combines a nonlinear magnetic equivalent circuit of the bearing with the ordinary differential equations of its mechanical and electric circuits. The model is validated by comparing the time responses of transients from calculations with those measured on a real object; the agreement is shown to be very satisfactory.</p