Patent ID: 8115348

Claim:
A coreless type linear motor, comprising: a magnetic rail, including a plurality of permanent magnets installed in two opposite rows, and an action space is reserved between said two opposite rows of permanent magnets; and a coil assembly, including a plurality of tri-phase unit coil modules alternately stacked in an axial direction, and a resin layer sealed onto said tri-phase unit coil modules, wherein said resin layer is situated at said action space of said magnetic rail, and said tri-phase unit coil modules include three sets of identical unit coils, and said unit coil includes a plurality of side-by-side arranged sub-coils having at least one bend on said axial non-action side; and said plurality of sub-coils have upper-layer sub-coils and lower layer sub-coils, and said upper-layer coils have a vertical length shorter than the vertical length of said lower-layer sub-coils.