<p>A linear motor armature (5) according to an embodiment includes an armature coil (7) and a cooling jacket (8). The cooling jacket (8) is provided to surround the armature coil (7) and has an internal space into which a refrigerant is supplied. The cooling jacket (8) is formed in a thin plate shape having a structure in which a channel for supplying the refrigerant is provided in a multiple manner in its thickness direction.
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