Patent ID: 8686669

Claim:
A method of controlling a linear motion system having a linear synchronous motor comprising a stator and at least two carrier units moveable in relation to said stator, said stator comprising a number of coil units, each of said at least two carrier units comprising a magnetic unit including an array of alternate-pole magnets having a regular magnet pole-pitch, wherein in order to form a train said at least two carrier units are arranged relative to each other so that the mutual distance between two identically poled magnets of two different magnetic units is an integer multiple of the magnet pole-pitch, wherein a train is formed by a first carrier unit being positioned over a first coil unit, and a second carrier unit being positioned over a second coil unit adjacent to said first coil unit, so that the mutual distance between two identically poled magnets of the magnetic units of said first and second carrier units, respectively, is an integer multiple of the magnet pole-pitch, and wherein said train is moved along said stator by a current being applied to a coil unit under said train, said current commutation being calculated for only one of said carrier units forming said train.