STATOR

• US 20120025658A1
• Filed: 12/18/2009
• Published: 02/02/2012
• Est. Priority Date: 12/18/2009
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Watanabe, Atsushi, Ando, Fujio, Haga, Masayoshi, Kitamura, Manabu
• Granted Patent: US 8,427,024 B2
• Time in Patent Office: Days
• US Class Current: 310/179
• CPC Class Codes: H02K 15/0081 for form-wound windings
• CPC Class Codes: H02K 15/045 Form wound coils
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information
• CPC Class Codes: H02K 3/12 arranged in slots

Abstract

To provide a stator capable of achieving downsizing and high output power and a stator manufacturing method, a stator comprises a split stator core including teeth and slots formed between the teeth, and protrusion-formed coils each being made of a flat rectangular conductor and placed in the slots. Each protrusion-formed coil has a shape including, in a coil end portion, a lead-side protrusion or a non-lead-side protrusion formed to protrude upward in an axial direction of the stator core from a first oblique side portion, a second oblique side portion, a third oblique side portion, and a fourth oblique side portion, and a first oblique side portion, a second oblique side portion, a third oblique side portion, and a fourth oblique side portion. The lead-side protrusion or the non-lead-side protrusion is designed with a height to avoid interference between the protrusion-formed coils placed in the stator core.

Claims

1. A stator comprising:

a stator core including teeth and slots formed between the teeth; and

coils each being made of a flat rectangular conductor and placed in the slots, wherein

each coil has a shape including, in a coil end portion, oblique side portions and a protrusion formed to protrude upward in an axial direction of the stator core from the oblique side portions,

the protrusion has a height to avoid interference between the coils placed in the stator core, and

the coil end portion of each coil is formed with a lane-change portion,

a coil interference-point distance between a first interference point at which a first coil and a second coil arranged adjacently interfere with each other and a second interference point at which the second coil and a third coil arranged adjacently interfere with each other is determined to be equal to or shorter than a bending center-to-center distance defined as a distance in a circumferential direction of the stator core between a bending center on an inner circumferential side of the lane-change portion located on the inner circumferential side of the stator core and a bending center on an outer circumferential side of the lane-change portion located on the outer circumferential side of the stator core.

2. In the stator according to claim 1, wherein

the flat rectangular conductors are stacked and formed with the protrusions and the lane change portions.

3. In the stator according to claim 1, wherein

each coil is wound in a concentric winding pattern, and

the coils are arranged cylindrically to form a cage coil, and the split stator core is inserted in the cage coil.

4. In the stator according to claim 2, wherein

each coil is wound in a concentric winding pattern, and

the coils are arranged cylindrically to form a cage coil, and the split stator core is inserted in the cage coil.