Patent ID: 8368258

Claim:
A linear motor armature comprising: an armature core including: a yoke extending straight; and a plurality of pole teeth fixed to the yoke and disposed along the yoke and spaced in a longitudinal direction of the yoke such that a slot is formed between two adjacent pole teeth; a plurality of excitation windings at least partially disposed in the slots formed in the armature core to excite the plurality of pole teeth; and a cooling device configured to cool the plurality of excitation windings using a coolant, the cooling device comprising: a first cooling conduit including: a first main conduit running zigzag, the first main conduit including a plurality of straight conduits extending inside the slots and a plurality of coupling conduits, each of which couples two adjacent straight conduits such that the plurality of straight conduits are connected in series; and a first pair of connecting conduits provided at both ends of the first main conduit; a second cooling conduit including: a second main conduit running zigzag and opposed to the first main conduit via the plurality of excitation windings, the second main conduit including a plurality of straight conduits extending inside the slots and a plurality of coupling conduits, each of which couples two adjacent straight conduits such that the plurality of straight conduits are connected in series; and a second pair of connecting conduits provided at both ends of the second main conduit; and a manifold provided to supply the coolant to the first cooling conduit and the second cooling conduit, wherein the manifold and the first and second pairs of connecting conduits are configured such that the coolant is supplied from one connecting conduit of the first pair of connecting conduits and one connecting conduit of the second pair of connecting conduits and discharged from the other connecting conduit of the first pair of connecting conduits and the other connecting conduit of the second pair of connecting conduits.