The position of the cursor as a function of time resulting from the dynamic analysis is shown figure 7. These components of the system can be arbitrarily defined.įigure 4: Simulink model of the actuator system – For higher resolution, click hereĬST EMS results are transferred to the Simulink via look-up tables, shown in Figure 4, which contain the flux-linkage and force as a function of coil current and position.įigure 5: Spring characteristic and coil voltage excitationsįigure 5 shows the piecewise non-linear characteristic used to simulate the spring (force versus displacement) and the excitation signals for the coils (voltage versus time).įigure 6: Coil currents versus time obtained from the Simulink modelįigure 6 shows the parameters for the external system, the electrical coil excitations and the piecewise approximation used for the spring.įigure 7: Simulink results of the force, position and speed versus time Two equations are solved, two electrical and one mechanical. In addition to the EM model of the actuator, the electrical supply (coils) and mechanical (load) parts of the complete system are shown in figure 3. The energy/co-energy approach is also possible in CST EMS.įigure 3: Coupled electro-mechanical system In this example, look-up tables of flux linkage and force against current and position are used for the dynamic analysis. Several formulations are available depending on the state variables required – energy/co-energy, flux linkage etc versus current and position. This weakly-coupled approach has the advantage that the electromagnetic simulation time is short and the speed of circuit simulation lends itself well to system parameterisation and optimisation.įurthermore, strongly-coupled field simulator approaches require much longer simulation times meaning that parametric analysis is not efficiently and rapidly carried out. and coupling with external circuit with a rectangular voltage waveform. coupling with mechanical system: spring, damping, etc. A parametric set of 3D magnetostatic simulations are carried out using CST EM Studio (CST EMS) on a linear actuator in order to obtain its electromagnetic characteristics for use in Simulink where both the electrical and dynamic performance can be obtained i.e. This article shows a common approach to the simulation of electromechanical problems.
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