Linear Alternator Various general versions of linear alternator configurations are possible, depending on the combination of magnet and armature coil. In our design a moving permanent magnet (samarium cobalt) was selected for two reasons. One, it has a superior dynamic performance because of its extremely low armature reactance. Two, if the magnet is shaped properly, the generated voltage can be made briefly proportional to piston velocity and independent of piston position [15]. The flat magnet plunger was sandwiched between two laminated stators, while the field coils (wound around both armatures) were connected in series as shown in Fig. 1. The power piston was directly connected to the moving magnet. When the magnet is reciprocated, an electric current is induced—it should be kept in mind that the maximum electromotive force arises at the two extremes of the plunger stroke, this being usually known as cogging characteristic. Test Procedures As listed in Table II, the key tests on the NALSEM-125 were run to clearly determine the influence on the thermodynamics/dynamics of the system by varying the engine parameters such as charge pressure, heater temperature and engine speed.
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