Linear motor and stage device using the linear motor

• US 7,462,959 B2
• Filed: 11/15/2006
• Issued: 12/09/2008
• Est. Priority Date: 07/12/2004
• Status: Expired due to Fees

• Current Assignee: Sumitomo Heavy Industries Limited
• Original Assignee: Sumitomo Heavy Industries Limited
• Inventors: Shinohira, Daisuke, Usui, Dotaro
• Primary Examiner(s): Schuberg; Darren
• Assistant Examiner(s): MOHANDESI, IRAJ A
• Application Number:
  US11/599,513
• Publication Number:
  US 20070056958A1
• Time in Patent Office: 755 Days
• Field of Search: 310/12, 310/15
• US Class Current: 310/12.06
• CPC Class Codes: H02K 41/03 Synchronous motors; Motors moving step by step; Reluctance motors H02K41/035 takes precedence

Abstract

A linear motor can include a coil part having a plurality of coils forming a coil line; a magnet yoke part having a plurality of permanent magnets facing the coil line; and a coil cooling part configured to cool the coil part. The coil cooling part can include a cooling panel having a heat conductive element, the heat conductive element transferring heat of the coil part to an outside; and a heat radiation part connected to the cooling panel, the heat radiation part being configured to radiate the heat transferred from the heat conductive element to the outside.

Claims

1. A linear motor, comprising:

a coil part having a plurality of coils forming a coil line;

a magnet yoke part having a plurality of permanent magnets facing the coil line; and

a coil cooling part configured to cool the coil part;

wherein the coil cooling part includes

a cooling panel having a heat conductive element, the heat conductive element transferring heat of the coil part to an outside; and

a heat radiation part connected to the cooling panel, the heat radiation part being configured to radiate the heat transferred from the heat conductive element to the outside,

wherein the heat conductive element is made of a heat pipe formed in an internal space of the cooling panel.

2. The linear motor as claimed in claim 1,

wherein the cooling panel is provided on a side surface of the coil part so that the heat of the coil part is transferred to the heat conductive element.

3. The linear motor as claimed in claim 1,

wherein the heat radiation part is provided at an end part of the coil part so as to come in contact with a heat radiation end part of the cooling panel.

4. The linear motor as claimed in claim 1,

wherein the coil cooling part includes

a plurality of the cooling panels;

and

a plurality of the heat radiation parts; and

heat input sides of the cooling panels are provided so as to come in contact with the center of the coil part.

5. The linear motor as claimed in claim 1,

wherein the cooling panel is formed so that the heat conductive element comes in contact with a side surface of the coil part and a holder part configured to hold the coil part.

6. The linear motor as claimed in claim 2,

wherein the cooling panel is provided on the side surface of the coil part so as to come in contact with the heat radiation part for transferring the heat of the coil part to the outside.

7. The linear motor as claimed in claim 6,

wherein the cooling panel includes:

a pair of vapor paths via which vapor moves from a heat input side to a heat radiation side; and

a reflux path via which liquid moves from the heat radiation side to the heat input side.

8. The linear motor as claimed in claim 7,

wherein the reflux path includes an extra fine wire wick;

and

reflux speed of the liquid is accelerated by the extra fine wire wick.

9. The linear motor as claimed in claim 4,

wherein the cooling panel includes:

a pair of vapor paths via which vapor moves from a heat input side to a heat radiation side; and

a reflux path via which liquid moves from the heat radiation side to the heat input side.

10. A stage device, comprising:

a linear motor;

a slider driven by the linear motor;

a stage configured to move with the slider; and

a guide part configured to guide the moving of the stage;

wherein the linear motor includes

a coil part having a plurality of coil forming a coil line;

a magnet yoke part having a plurality of permanent magnets facing the coil line; and

a coil cooling part configured to cool the coil part; and

wherein the coil cooling part includes

a cooling panel having a heat conductive element, the heat conductive element transferring heat of the coil part to an outside; and

a heat radiation part connected to the cooling panel, the heat radiation part being configured to radiate the heat from the heat conductive element to the outside,

wherein the heat conductive element is made of a heat pipe formed in an internal space of the cooling panel.

11. The stage device as claimed in claim 10,

wherein the cooling panel is provided on a side surface of the coil part so that the heat of the coil part is transferred to the heat conductive element.

12. The stage device as claimed in claim 10,

wherein the heat radiation part is provided at an end part of the coil part so as to come in contact with a heat radiation end part of the cooling panel.

13. The stage device as claimed in claim 10,

wherein the coil cooling part includes

a plurality of the cooling panels;

and

a plurality of the heat radiation parts; and

heat input sides of the cooling panels are provided so as to come in contact with the center of the coil part.

14. The stage device as claimed in claim 10,

wherein the cooling panel is formed so that the heat conductive element comes in contact with a side surface of the coil part and a holder part configured to hold the coil part.

15. The stage device as claimed in claim 11,

wherein the cooling panel is provided on the side surface of the coil part so as to come in contact with the heat radiation part for transferring the heat of the coil part to the outside.

16. The stage device as claimed in claim 15,

wherein the cooling panel includes:

a pair of vapor paths via which vapor moves from a heat input side to a heat radiation side; and

a reflux path via which liquid moves from the heat radiation side to the heat input side.

17. The stage device as claimed in claim 16,

wherein the reflux path includes an extra fine wire wick;

and

reflux speed of the liquid is accelerated by the extra fine wire wick.

18. The stage device as claimed in claim 13,

wherein the cooling panel includes:

a pair of vapor paths via which vapor moves from a heat input side to a heat radiation side; and

a reflux path via which liquid moves from the heat radiation side to the heat input side.