Patent ID: 7679226
Filing Date: 2010-03-16
Classification: H02K

Abstract:
1. A synchronous linear motor, comprising: a primary part; a secondary part constructed in form of a toothed rod in the absence of permanent magnets, said secondary part having a predetermined multitrack toothed structure in form of a plurality of separate mutually parallel toothed tracks extending in a movement direction of the primary part, wherein teeth in each of the parallel toothed tracks have varying predetermined shapes in the movement direction or are separated by grooves having a redetermined depth that varies in the movement direction, or both; and a multitrack position detection device arranged directly or indirectly on the primary part for scanning the toothed structure, without making contact, to obtain a position signal in form of a code word composed of code values arranged perpendicular to the movement direction, each code value representative of the predetermined tooth shape or groove depth in one of separate toothed tracks, wherein the code word determines a position on the secondary part in the movement direction.