Abstract
The thrust force of moving magnet type linear direct current motor (MM-LDM) is analyzed in this study. The moving magnet type MM-LDM consists of a stator and a mover. The stator is composed of two stick shape electromagnets and the mover consists the movable permanent magnet that is located in two electromagnets.One of the methods to calculate the thrust force of the MM-LDM is analyzed by the energy gradient which is decided by the distribution of magnetic flux. But this method is very difficult for calculating the thrust force of these kind of LDM. This MM-LDM can be considered as a transformer, when the magnet of the mover is assumed to be a one-turn coil carrying large current. The stored energy in the MM-LDM can be gotten by measuring the self-inductance and the mutal-inductance of the equivalent circuit of the MM-LDM. And this energy gradient gives the thrust force.The calculation of thrust force induced on this motor shows that the mutual inductance has much influence on the generation of thrust force.
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