Linear motor and machine tool

A linear motor for use in a machine tool, the linear motor comprising:

• a magnet plate including a plurality of magnets arranged side by side in a first direction;
• a slider including a plurality of coils arranged side by side in the first direction, and configured to slide in the first direction relative to the magnet plate;
• and
• a cooling pipe provided at a surface portion of the slider on a side opposite to a side facing the magnet plate,
• wherein the surface portion is provided with a plurality of grooves and a plurality of ridges that alternate in the first direction,
• the grooves are each elongated in a second direction that is parallel to a surface of the magnet plate and orthogonal to the first direction,
• the ridges are each elongated in the second direction,
• the cooling pipe is routed on the slider so as to wind back and forth through the grooves,
• each of the ridges has two end portions in the second direction including a first end portion on a side along which a bent portion of the cooling pipe extends, and
• on at least one side in the second direction, each of the first end portions is entirely located inward of two end faces of the slider in the second direction, or a portion of each of the first end portions, excluding a central portion of the first end portion in the first direction, is located inward of the two end faces of the slider in the second direction.