ROTOR AND METHOD FOR MANUFACTURING ROTOR

• US 20160352200A1
• Filed: 02/04/2015
• Published: 12/01/2016
• Est. Priority Date: 02/28/2014
• Status: Active Grant

• Current Assignee: NHK Spring Company Limited
• Original Assignee: NHK Spring Company Limited
• Inventors: KANEDA, Noriyoshi, NISHIHAMA, Shota
• Granted Patent: US 10,505,432 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B23K 20/122 using a non-consumable tool, e.g. friction stir welding
• CPC Class Codes: B23K 2101/36 Electric or electronic devices
• CPC Class Codes: H02K 15/0012 Manufacturing cage rotors
• CPC Class Codes: H02K 17/16 having rotors with internally short-circuited windings, e.g. cage rotors
• CPC Class Codes: H02K 17/165 characterised by the squirrel-cage or other short-circuited windings
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information

Abstract

A rotor includes: conductors having a bar shape; a first end ring joined to one ends of the conductors by friction stir welding, at least a surface opposite to a surface from which the conductors extend being stirred by the friction stir welding; a second end ring joined to other ends of the conductors by friction stir welding, at least a surface opposite to a surface from which the conductors extend being stirred by the friction stir welding; and an iron core disposed between the first and the second end rings, having a cylindrical shape, and including a plurality of insertion holes through which the respective conductors are insertable in a central axis direction of the iron core.

Claims

1. A rotor comprising:

a plurality of conductors having a bar shape;

a first end ring joined to one ends of the conductors by friction stir welding, at least a surface opposite to a surface from which the conductors extend being stirred by the friction stir welding;

a second end ring joined to other ends of the conductors by friction stir welding, at least a surface opposite to a surface from which the conductors extend being stirred by the friction stir welding; and

an iron core disposed between the first and the second end rings, having a cylindrical shape, and including a plurality of insertion holes through which the respective conductors are insertable in a central axis direction of the iron core.

2. The rotor according to claim 1, wherein the first and the second end rings are stirred by the friction stir welding.

3. A method for manufacturing a rotor including a plurality of conductors having a bar shape, a cylindrical iron core including a plurality of insertion holes through which the respective conductors are insertable, and first and second end rings that are joined to respective ends of the conductors, the method comprising:

a friction-stir-welding step of joining the conductors and a base by friction stir welding with end portions of the conductors housed in the base, such that the base includes the cylindrical iron core in a central axis direction of the iron core; and

a forming step of forming the end rings by cutting the base such that at least a surface opposite to a surface from which the conductors extend, out of surfaces of the base that have been subjected to the friction-stir-welding step, becomes a surface stirred by the friction stir welding.

4. The method for manufacturing a rotor according to claim 3, wherein the friction-stir-welding step joins the base and the conductors the friction stir welding, the base being made of a material identical to a material of the conductors, after inserting the ends of the conductors into insertion holes formed in the base.

5. The method for manufacturing a rotor according to claim 3, wherein the friction-stir-welding step joins the base and the conductors the friction stir welding, the base being made of a material different from a material of the conductors, after fitting the ends of the conductors into recesses formed in the base.