Patent ID: 8674561
Filing Date: 2014-03-18
Classification: H02K

Abstract:
1. A multi-head linear motor with cores comprising: a permanent magnet field including P pieces of permanent magnets arrayed in a linear direction so as to alternately have different magnetic poles; and an armature that is arranged so as to face the permanent magnet field through a magnetic air gap and that includes M pieces of armature coils collectively wound around an armature core and being in three-phase connection, wherein any one of the armature and the permanent magnet field constitutes a mover, the other constitutes a stator, the mover is arranged in plurality to be lined up over a single piece of the stator, and the movers are individually driven relative to the stator, the movers each include a large thrust mover and a small thrust mover that have different relationships each determined with a magnetic pole number P of the permanent magnets and a number M of the armature coils relative to the stator, and each of lengths of the large and small thrust movers is determined based on the magnetic pole number P of the corresponding permanent magnets.