Dynamo-electric machine

• US 20040113508A1
• Filed: 10/08/2003
• Published: 06/17/2004
• Est. Priority Date: 12/27/2000
• Status: Active Grant

• Current Assignee: Hitachi, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Watanabe, Takeyuki, Ueda, Toshiaki, Yasuhara, Takashi
• Granted Patent: US 6,998,752 B2
• Time in Patent Office: Days
• US Class Current: 310/211
• CPC Class Codes: H02K 15/0012 Manufacturing cage rotors
• CPC Class Codes: H02K 17/168 having single-cage rotors
• CPC Class Codes: Y10T 29/49012 Rotor

Abstract

Conductor bars 7a and end rings 7b, 7c of a rotor 5 of a rotary electric machine are made of an aluminum material. The end rings 7b, 7c are electrically and mechanically joined to the opposite ends of the conductor bars 7a with friction stir welding.

Claims

1. A rotary electric machine comprising a stator and a rotor arranged in an opposed relation to said stator,

said rotor comprising a core, a plurality of conductor bars inserted respectively through a plurality of holes axially formed in said core, and end rings attached to opposite ends of said conductor bars,

wherein said conductor bars and said end rings are made of an aluminum material, and

said end rings are electrically and mechanically joined to the opposite ends of said conductor bars with friction stir welding.

6. A rotary electric machine according to any one of claims 1 to 5, wherein an aluminum alloy is used as the aluminum material forming said end rings.

7. A rotary electric machine according to any one of claims 1 to 5, wherein pure aluminum alloy is used as the aluminum material forming said conductor bars, and

an aluminum alloy is used as the aluminum material forming said end rings.

8. A rotary electric machine according to any one of claims 1 to 5, wherein said rotor is a skewed rotor.

2. A rotary electric machine comprising a stator and a rotor arranged in an opposed relation to said stator,

said rotor comprising a core, a plurality of conductor bars inserted respectively through a plurality of holes axially formed in said core, and end rings attached to opposite ends of said conductor bars,

wherein said conductor bars and said end rings are made of an aluminum material, and

said end rings are electrically and mechanically joined to the opposite ends of said conductor bars with friction stir welding such that a locus formed by the friction stir welding is drawn in conformity with a shape of said end ring.

3. A rotary electric machine comprising a stator and a rotor arranged in an opposed relation to said stator,

said rotor comprising a core, a plurality of conductor bars inserted respectively through a plurality of holes axially formed in said core, and end rings attached to opposite ends of said conductor bars,

wherein said conductor bars and said end rings are made of an aluminum material, and

said end rings are electrically and mechanically joined to the opposite ends of said conductor bars with friction stir welding such that a plurality of loci formed by the friction stir welding are drawn in conformity with shapes said conductor bars.

4. A rotary electric machine comprising a stator and a rotor arranged in an opposed relation to said stator,

said rotor comprising a core, a plurality of conductor bars inserted respectively through a plurality of holes axially formed in said core, and end rings attached to opposite ends of said conductor bars,

wherein said conductor bars and said end rings are made of an aluminum material, and

end surfaces of said conductor bars and one lateral surface of said end ring are electrically and mechanically joined to each other with friction stir welding.

5. A rotary electric machine comprising a stator and a rotor arranged in an opposed relation to said stator,

said rotor comprising a core, a plurality of conductor bars inserted respectively through a plurality of holes axially formed in said core, and end rings attached to opposite ends of said conductor bars,

wherein said conductor bars and said end rings are made of an aluminum material, and

said conductor bars are fitted to a groove formed in said end ring, and a peripheral surface of said end ring is electrically and mechanically joined to one surfaces of said conductor bars with friction stir welding.