A position detecting method using hall element for discontinuous stator permanent magnet linear synchronous motor

A position sensor of the linear synchronous motor (LSM) uses an encoder head on the mover and a linear scale on the stator side. For the long distance LSM, a linear scale must be arranged on the overall transport path, and this leads to extremely high costs. In addition, is restricted by the length of the movement of LSM the feeding power cable to the encoder head on the mover. In order to resolve these problems, we propose a new position detecting system that uses the magnetic flux of the magnet on the mover. The flux detection sensor uses a hall element. The position is calculated by using three hall voltages with the phase lag of 240 degrees. This paper provides a position derivation simulation from the Hall element signal. Experimental verification of the proposed system is performed.