Volume 61 Issue 2 (2011) - Годишник на ТУ - София - Технически ...

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3.5. Circuit-FEM CouplingBoth field problems are coupled with Matlab/Simulink circuit model interfacing withOctave/Lua, shown in Fig.3.In circuit model the electromagnet is represented with its coil resistance - R and inductance– L (Fig.4), both calculated by Femm. Interactions are successively and foreach time step the values of R and L are updated due to circuit current signal.Circuit model is represented with several Simulink sub-system blocks, shown inFig.4.Power electronics block is a DC-DC controllable converter which fed the electromagneticactuator circuit. In fact, it could be replaced by any supply source or electroniccircuit model.Fig.4. Electric circuit in Simulink.Fig.5. Electromagnetic actuator circuit sub-system.Calculated electromagnetic force is used for air-gap calculation in each time step by(9).Simulink block diagram of actuator circuit is presented in Fig.4. It realizes the Simulink-Octaveinterface. Octave-Femm interface is made by Lua-scrip file called bySimulink.118
4. ResultsAs it has been mentioned above a DC electromagnetic actuators with double E-shaped core is investigated (Fig.2). The actuator is fed by voltage supply block andcontrollable DC-DC convertor. Used electric circuit schemes are shown in Fig.4. andFig.5.4.1. FEM ModelResult for thermal and magnetic field distributions in last moment of closing thearmature are shown on Fig.5 and Fig.6. Magnetic flux density maximal value is 1Tand maximal temperature of 45°C is in coil region.Fig.6. Magnetic flux density distribution.Fig.7. Thermal field distribution.4.2. Dynamic characteristicsDynamical characteristics of DC electromagnetic actuators are evaluated in timerange 0 to 2 seconds. Transient process of closing the armature is presented. MatlabODE23t method with time varying time step is used in evaluation [10].DC electromagnet dynamical characteristics are shown in Fig.-Fig. 8-11. Relativelylow speed of armature displacement is due to large air-gap and initial damping force.4. ConclusionHighly effective and fast method for indirect coupling of field problems with circuit’smodel is proposed. Method uses the huge capabilities of Matlab/Simulink environmentand popular Femm program with Lua-script and Octave interface.119
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ISSN 1311-0829ГОДИШНИК НА
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Годишник на Технич
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Proposition 3.8 For any n ≥ 2 in
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2.5 Bi-Semigroup Action Problem (BS
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Theorem 4.5 [14]. In the center of
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The only way we know for an attacke
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Laskin and Wang presented a detaile
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Figure 2: Temperature dependence of
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An additional analysis obtained at
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Volume 61 Issue 2 (2011) - Годишник на ТУ - София - Технически ...

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