Manufacturing method for helical core for rotating electrical machine and manufacturing device for helical core for rotating electrical machine

• US 9,647,517 B2
• Filed: 01/28/2011
• Issued: 05/09/2017
• Est. Priority Date: 10/07/2009
• Status: Active Grant

• Current Assignee: Nippon Steel Corporation
• Original Assignee: Nippon Steel & Sumitomo Metal Corporation (Nippon Steel Corporation)
• Inventors: Kurosaki, Yousuke
• Primary Examiner(s): VO, PETER DUNG BA
• Assistant Examiner(s): Kue, Kaying
• Application Number:
  US13/995,280
• Publication Number:
  US 20130276297A1
• Time in Patent Office: 2,293 Days
• Field of Search: 29605, 29596, 29240, 292405, 29732, 310208, 310195-203
• CPC Class Codes: H02K 1/148 Sectional cores H02K1/141 takes precedence
• CPC Class Codes: H02K 15/02 of stator or rotor bodies
• CPC Class Codes: H02K 15/022 with salient poles or claw-shaped poles
• CPC Class Codes: H02K 15/026 Wound cores
• CPC Class Codes: Y10T 29/49009 Dynamoelectric machine
• CPC Class Codes: Y10T 29/53691 Means to insert or remove helix

Abstract

A manufacturing method of a helical core for a rotating electrical machine includes: first step forming a yoke portion extending along one direction and tooth portions protruding toward a width direction of the yoke portion from a first side edge of the width direction, with respect to a belt-shaped metal plate extending along the one direction; second step forming a notch at a position between tooth portions of the yoke portion after the first step; and third step processing the belt-shaped metal plate into a helical shape by applying bending to the metal plate so that the belt-shaped metal plate is curved toward the width direction sequentially from a portion where the notch is formed after the second step, and in the third step, a distance between a position where the application of bending starts and the position where the notch is formed is limited to within a predetermined dimension.

Claims

1. A manufacturing method of a helical core for a rotating electrical machine, the method comprising:

forming a yoke portion and a plurality of tooth portions protruding toward a width direction of the yoke portion from a first side edge of the width direction;

forming a notch by punching processing at a position between the tooth portions of the yoke portion, wherein the yoke portion, the plurality of tooth portions and the notch are formed on a belt-shaped metal plate;

heating the belt-shaped metal plate; and

bending the heated belt-shaped metal plate from a linear configuration into a helical shape so that the belt-shaped metal plate is curved toward the width direction sequentially from a portion in which the notch is formed,

wherein, during bending, a distance between a position at which application of the bending starts and a position at which the notch is formed is set to be 10 mm or more and 1000 mm or less.

2. The manufacturing method of the helical core for a rotating electrical machine according to claim 1, the method further comprising,

performing stress relief annealing by heating the belt-shaped metal plate during or after the bending of the heated belt-shaped metal plate.

3. The manufacturing method of the helical core for a rotating electrical machine according to claim 1,

wherein a depth dimension of the notch is 1/2 times or more of a width dimension of the yoke portion and is less than the width dimension of the yoke portion.

4. The manufacturing method of the helical core for a rotating electrical machine according to claim 1,

wherein a shape on a plate surface of the notch is an isosceles triangle or an equilateral triangle that includes a base on the first side edge in the width direction of the yoke portion.

5. The manufacturing method of the helical core for a rotating electrical machine according to claim 1,

wherein a shape on a plate surface of the notch is a shape in which a circle or an ellipse is added to a vertical angle of an isosceles triangle or an equilateral triangle that includes a base on the first side edge in the width direction of the yoke portion.

6. The manufacturing method of the helical core for a rotating electrical machine according to claim 1,

wherein at least a portion of a second edge in the width direction of the yoke portion is linear.