Moving-magnet type linear motor
First Claim
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1. 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, andwherein 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.
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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.
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Citations
6 Claims
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1. A moving-magnet type linear motor comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification