Rotary electrical machine

Patent metadata

Field	Value
Publication number	US-12160150-B2
Application number	US-201917763097-A
Country	US
Kind code	B2
Filing date	Oct 21, 2019
Priority date	Oct 21, 2019
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

To provide a rotary electrical machine having a novel configuration adapted to provide axial downsizing of the rotary electrical machine when connecting an electrical connection conductor to a welded side terminal section of a coil end of a segment coil. The rotary electrical machine includes: a stator core 21 including slots radially extended in a radial fashion; a plurality of segment coils 34 radially stacked and accommodated in the slot 37 ; and a neutral point bus-bar 33 laid on a side of a welded coil end of the segment coil 34 and including a connection wiring section and a connection section for interconnecting the different segment coils. In a state where the segment coils 34 are mounted, at least a part of the connection wiring section is laid in a radial space RS radially defined by the segment coils 34 . The connection wiring section can be laid in the radial space RS radially defined by the segment coils 34 so that axial elongation of a configuration space for the electrical connection conductor 33 is prevented. Thus, the axial downsizing of the rotary electrical machine can be achieved.

First claim

The invention claimed is:

1. A rotary electrical machine comprising:
a stator core including a plurality of slots radially extended in a radial fashion;
a plurality of segment coils radially stacked and accommodated in the slot; and
an electrical connection conductor interconnecting the different segment coils as laid on a side of a welded coil end of the segment coil, and including a connection wiring section and a connection section,
wherein in a state where the segment coils are mounted, at least a part of the connection wiring section is laid in a radial space radially defined by the segment coils;
wherein the radial space is defined between a radial line of welded sections formed by welding together welded terminal sections of the segment coils accommodated in the two different slots and another radial line of the welded sections adjoining the above line of welded sections, and
a radial connection wiring section forming a part of the connection wiring section is laid in the radial space.

2. The rotary electrical machine according to claim 1 ,
wherein the connection wiring section includes: the radial connection wiring section laid in the radial space; and a circumferential connection wiring section formed on an inner circumferential side and an outer circumferential side of the slot, and
the radial connection wiring section and the circumferential connection wiring section are continuously formed.

3. The rotary electrical machine according to claim 1 ,
wherein the connection wiring section includes: the radial connection wiring section laid in the radial space; and a circumferential connection wiring section formed on an inner circumferential side or an outer circumferential side of the slot, and
at least the radial connection wiring section and the circumferential connection wiring section on the inner circumferential side are continuously formed.

4. The rotary electrical machine according to claim 2
wherein a phase coil formed of the segment coil is star-connected, and
the electrical connection conductor is a neutral point bus-bar for connecting a neutral point of the phase coil, and the connection section of the electrical connection conductor is connected to the neutral point of the phase coil.

5. A rotary electrical machine comprising:
a stator core including a plurality of slots radially extended in a radial fashion;
a first coil assembly which includes a three-phase coil formed of a plurality of segment coils radially stacked and accommodated in the plural slots and has the three-phase coils star-connected; and a second coil assembly which also has the three-phase coils star-connected; and
a neutral point bus-bar laid on a side of a welded coil end of the segment coil and interconnecting a neutral point of the phase coil of the first coil assembly and a neutral point of the phase coil of the second coil assembly,
wherein a part of the neutral point bus-bar is laid in a radial space defined between a radial line of welded sections formed by welding together welded terminal sections of the segment coils accommodated in the two different slots and another radial line of the welded sections adjoining the above line of welded sections, and
the neutral point bus-bar other than the neutral point bus-bar laid in the radial space is laid on an inner circumferential side and an outer circumferential side of the slot.

6. The rotary electrical machine according to claim 5 ,
wherein the neutral point bus-bar includes: a radial connection wiring section laid in the radial space; and a circumferential connection wiring section formed on the inner circumferential side and the outer circumferential side of the slot, and
the radial connection wiring section and the circumferential connection wiring section are laid at places shifted axially of the stator core and closer to the end face section of the stator core than the welded section of the segment coil.

7. The rotary electrical machine according to claim 5 ,
wherein the inner circumferential side segment coil in the slot of each phase coil is formed with an input terminal for the phase coil of the first coil assembly and with the neutral point for the phase coil of the second coil assembly,
an outer circumferential side segment coil in the slot of each phase coil is formed with the input terminal for the phase coil of the second coil assembly and with the neutral point for the phase coil of the first coil assembly,
the inner circumferential side circumferential connection wiring section of the neutral point bus-bar is connected to the neutral point of the phase coil of the second coil assembly,
the outer circumferential side circumferential connection wiring section of the neutral point bus-bar is connected to the neutral point of the phase coil of the first coil assembly, and
the radial wiring connection section interconnects the inner circumferential side circumferential connection wiring section and the outer circumferential side circumferential connection wiring section.

8. The rotary electrical machine according to claim 6 ,
wherein the input terminal and the neutral point formed on the inner circumferential side are alternately formed, and
the input terminal and the neutral point on the outer circumferential side are alternately formed as well.

9. The rotary electrical machine according to claim 7 ,
wherein of the segment coils arranged in the same slot, the segment coil located on the inner circumferential side is the input terminal or the neutral point, and
the segment coil located on the outer circumferential side is the neutral point or the input terminal.

10. The rotary electrical machine according to claim 8 ,
wherein a circumferential length of the outer circumferential side circumferential connection wiring section of the neutral point bus-bar is defined to be longer than a circumferential length of the inner circumferential side circumferential connection wiring section.

11. The rotary electrical machine according to claim 9 ,
wherein the inner circumferential side circumferential connection wiring section of the neutral point bus-bar is connected to an outer circumferential surface of the segment coil located on an inner circumferential side of the slot.

Assignees

• Hitachi Astemo Electric Motor Systems Ltd
• Hitachi Astemo Ltd

Inventors

• Misaki Seigo
• Koizumi Takayuki
• Kitajima Shingo
• Shimizu Hisaya

Classifications

• H02K2203/09

  Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations · CPC title

• Y02T10/64

  Electric machine technologies in electromobility · CPC title

• H02K3/50 Primary

  Fastening of winding heads, equalising connectors, or connections thereto · CPC title