Two-phase induction linear motor with double file stator and bilayer liner

We have built and evaluated a repulsive-force magnetic levitation induction linear motor having a two-phase open core. The motor uses a double file stator and a bilayer liner to provide guidance force. We investigated the energy balance of the two phases for two types of winding connections and found that the power consumptions of the two phases were nearly equal to each other in one of the windings while they were much different from each other in the other connection. This result is discussed here with the help of an equivalent circuit. We further found that increasing the frequency led to a high impedance of the exciting circuit and caused a large levitation force and high levitation efficiency.