Moving-magnet type linear motor
AssigneeJtekt Corporation
InventorNaomasa Mukaide
Life of this patent
Estimating the term…
Abstract
A moving-magnet type linear motor is provided with cooling blocks which are attached to each of stator bases alongside a coreless coil and which allow coolant to flow therethrough for cooling the coreless coil. Each of the cooling blocks has in a base end portion thereof a fluid passage for flowing coolant and at an extreme end portion thereof a plurality of sheet-like protrusions like fins which are arranged alongside a part of the circumferential surface of the coreless coil with a clearance between each protrusion and the next thereto. Each cooling block is thermally closely jointed with the coreless coil at the extreme ends of the sheet-like protrusions.
Claims6
A moving-magnet type linear motor comprising:
- a magnet yoke forming an even-number polygonal cylinder with a plurality of flat walls and movable in the axial direction of the even-number polygonal cylinder;
- a plurality of magnet constructs respectively attached to outer surfaces of the flat walls of the magnet yoke and composed of a plurality of permanent magnets;
- a stator base provided to surround the magnet yoke;
- a plurality of coreless coils attached to the stator base and arranged to respectively face the plurality of magnet constructs each with a magnetic clearance relative to the associated magnet construct;
- and
- at least one cooling member attached to the stator base each to follow a part of circumferential surface of the associated coreless coil and allowing coolant to flow inside for cooling the associated coreless coil;
- wherein the at least one cooling member has in its base end portion a fluid passage for enabling coolant to flow therethrough and at its extreme end portion a plurality of sheet-like protrusions, and
- wherein the plurality of sheet-like protrusions are arranged along the part of the circumferential surface of the associated coreless coil with a clearance between each protrusion to the next and are jointed thermally closely with the associated coreless coil at extreme ends thereof.
Dependencies are inferred from the claim text.