WO2015053229A1

WO2015053229A1 - Core of rotary electric machine

Info

Publication number: WO2015053229A1
Application number: PCT/JP2014/076718
Authority: WO
Inventors: 永田　孝一; 大野　正明
Original assignee: 株式会社デンソー; デンソートリム株式会社
Priority date: 2013-10-08
Filing date: 2014-10-06
Publication date: 2015-04-16
Also published as: JP2015076941A

Abstract

A core (1) of a rotary electric machine, said core comprising a positioning body (22) and first and second engagement pieces (23, 24). First, the positioning body (22) is disposed on the inner periphery of a cylinder section (19), and positions a lamination unit in the radial direction by making contact with the inner periphery of a bottom lamination section (17). Furthermore, the first engagement piece (23) hooks onto the outer periphery of the bottom lamination section (17) from the outer circumferential side and one end side in the axial direction of the bottom lamination section (17). Moreover, the second engagement piece (24) hooks onto the outer periphery of the bottom lamination section (17) from the outer circumferential side and the other end side in the axial direction of the bottom lamination section (17). Thus, by holding the cylinder section (19), the integrity of the core (1) can be maintained. Therefore, even if the number of teeth (10) is increased, the integrity of the core (1) can be maintained regardless of the size of the tolerance.

Description

Rotating electrical machine core

The present invention relates to a core of a rotating electric machine.

Conventionally, in the core of a rotating electrical machine, a technique for forming teeth by laminating steel plates in the circumferential direction is known in order to suppress a so-called magnetic flux short circuit. In addition, as an example of such a core, a reluctance motor rotor is formed by laminating steel sheets having a substantially L-shaped cross section to form an L-shaped laminated unit, and salient poles (teeth) are formed by both sides of the L-shaped laminated unit. Is known (see, for example, Patent Document 1). And according to the rotor of patent document 1, in order to maintain the integrity as a core, the holder is used.

By the way, as shown in FIG. 10, when the number of teeth 101 increases in the rotating electrical machine, the tolerance increases, and the gap 103 between the sides 102 adjacent to each other in the circumferential direction tends to increase.
However, the holder of Patent Document 1 maintains the integrity as the core 100 by sandwiching the teeth 101 in the circumferential direction by the two claw portions 104. For this reason, when the number of the teeth 101 increases, the possibility that the holder cannot be mounted increases due to an increase in the gap 103 between the sides 102.

Utility Model Registration No. 2598336

The present invention has been made in view of the above background, and was obtained in the hope of providing a configuration capable of maintaining the integrity as a core even when the number of teeth is increased in the core of a rotating electrical machine. Is.

The core of the rotating electrical machine according to the present invention includes, as one aspect thereof, a cylindrical yoke and a plurality of teeth protruding from the yoke to the outer peripheral side. Moreover, the steel plate used as a raw material is bent so as to have two sides that sandwich the bottom and the bottom, and a core skeleton is configured by combining a plurality of lamination units formed by laminating a plurality of steel plates. Further, in the skeleton, a plurality of bottom laminated portions in which the bottom portions of the laminated units are stacked are combined to form a cylindrical portion on the inner peripheral side, and a side laminated portion in which the side portions are stacked protrudes to the outer peripheral side. A plurality of stacked units are arranged in a ring shape. The cylindrical portion of the skeleton forms all or part of the yoke, and the side laminated portion protruding to the outer peripheral side forms all or part of the teeth.

Furthermore, the core includes the following positioning body and first and second engaging pieces. First, a positioning body is arrange | positioned at the inner periphery of a cylinder part, contacts the inner periphery of a some bottom laminated part, and positions a some lamination | stacking unit to radial direction. Further, the first engagement piece is hooked on the outer periphery of the bottom stacked portion from one axial end side and the outer peripheral side of the bottom stacked portion. Further, the second engagement piece is hooked on the outer periphery of the bottom laminated portion from the other axial end side and the outer peripheral side of the bottom laminated portion.

Therefore, the integrity of the core can be maintained by holding the cylindrical portion that exists on the inner periphery of the side. For this reason, even if the number of teeth increases, the integrity as the core can be maintained regardless of the tolerance.

(A) is sectional drawing which shows the rotary electric machine provided with a core in the Example of this invention, (b) is a principal part enlarged view of (a). It is a perspective view of the steel plate in an Example. (A) is explanatory drawing which shows a mode that the steel plate in an Example is laminated | stacked, (b) is a top view of the lamination | stacking unit in an Example. It is a top view which shows the state which mounted | wore the frame with the positioning body in an Example. It is a top view which shows the state which integrated the frame | skeleton, the positioning body, etc. with the 1st, 2nd restraint body in an Example. (A) is a top view of the positioning body in an Example, (b) is a side view of the positioning body in an Example. It is a top view of the 1st and 2nd restraint body in an Example. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. It is explanatory drawing which shows the rotation stop with respect to the frame | skeleton in a modification. It is explanatory drawing which shows a mode that the clearance gap between sides is increasing in the frame | skeleton in a prior art example.

The core of the rotating electrical machine of the present invention will be described using examples.

[Configuration of Example]
The configuration of the core 1 according to the embodiment of the present invention will be described with reference to FIGS.
The core 1 is a stator core used for the stator 3 of the generator 2 as a rotating electrical machine, for example, and the generator 2 is mounted on a vehicle, for example, and is driven to rotate by the output of the internal combustion engine.
That is, the generator 2 includes a rotor 5 fixed to the crankshaft 4 and rotated by the output of the internal combustion engine, and a stator 3 to which a coil 6 is attached and disposed on the inner peripheral side of the rotor 5 (see FIG. 1). .) The generator 2 generates power by inducing an electromotive force in the coil 6 by the magnetic flux generated by the magnet 7 mounted on the rotor 5.

The core 1 includes a cylindrical yoke 9 and a plurality of teeth 10 protruding from the yoke 9 to the outer peripheral side and wound with a coil 6. Moreover, the steel plate 11 used as the raw material of the core 1 is provided as what exhibits a substantially U-shaped cross section by bending the material after stamping by the press. That is, the steel plate 11 is bent so as to have a bottom portion 12 and two side portions 13 sandwiching the bottom portion 12. Then, a skeleton 15 of the core 1 is configured by combining a plurality of lamination units 14 formed by laminating a plurality of steel plates 11 (see FIGS. 2 to 5 and the like).

Here, the lamination unit 14 includes a bottom lamination portion 17 in which the bottom portion 12 is stacked, and two side lamination portions 18 in which the side portions 13 are stacked. The skeleton 15 is configured by arranging a plurality of stacked units 14 in a ring shape. At this time, a plurality of bottom laminated portions 17 are combined to form a cylindrical portion 19 on the inner peripheral side, and the side laminated portion 18 protrudes to the outer peripheral side.

The cylindrical portion 19 of the skeleton 15 forms a part of the yoke 9.
Further, one tooth 10 is constituted by two side laminated portions 18 that are adjacent to each other in the circumferential direction in a combination of two laminated units 14 that are adjacent in the circumferential direction. That is, in the combination of two adjacent lamination units 14, the side lamination part 18 located on the other circumferential side of the two side lamination parts 18 of the lamination unit 14 on the one circumferential side and the lamination on the other circumferential side. Of the two side laminated portions 18 of the unit 14, the side laminated portion 18 located on one side in the circumferential direction abuts in the circumferential direction to form one tooth 10.

In addition, the edge part 13 is provided with a collar part 20 that extends to both ends in the axial direction when incorporated as the skeleton 15 or the core 1, and the collar part 20 is also stacked similarly to the bottom part 12 and the side part 13. The heel laminated portion 21 is configured. Here, the eaves layer portion 21 reinforces the delivery of magnetic flux between the core 1 and the magnet 7, and the amount of protrusion in the axial direction is determined according to the axial length of the magnet 7.

Furthermore, the core 1 includes the following positioning body 22 and first and second engagement pieces 23 and 24 (see FIGS. 4 to 8 and the like).
First, the positioning body 22 is disposed on the inner periphery of the cylindrical portion 19 and contacts the inner periphery of the plurality of bottom stacked portions 17 to position the plurality of stacked units 14 in the radial direction. Here, the positioning body 22 is formed by laminating substantially annular plate-shaped steel plates 25 in the axial direction, and constitutes the yoke 9 together with the cylindrical portion 19.

Further, the outer peripheral edge of the steel plate 25 is a regular polygonal shape having the same number of sides as the cylindrical portion 19, and the inner peripheral edge is a concentric circle with the outer peripheral edge. Further, circular holes 25a are opened through the steel plate 25 in the axial direction at an angular interval of 120 °, for example. And the some steel plate 25 is laminated | stacked so that the position of the hole 25a may correspond regarding the circumferential direction, and an outer periphery may become a side surface of a regular polygonal column. As a result, the positioning body 22 is disposed on the inner periphery of the cylindrical portion 19 and the outer periphery is brought into contact with the inner periphery of the bottom laminated portion 17, whereby the outer periphery of the positioning body 22 functions as a detent for the skeleton 15. The positioning body 22 has a cylindrical surface 27 on the inner periphery, and has three through holes 28 at an angular interval of 120 °.

Next, the first engaging piece 23 is hooked to the outer periphery of the bottom laminated portion 17 from one axial end side and the outer peripheral side of the bottom laminated portion 17, and the second engaging piece 24 is the shaft of the bottom laminated portion 17. It is caught on the outer periphery of the bottom laminated portion 17 from the other end side in the direction and from the outer peripheral side (see FIG. 1B).

Further, the first and second

engaging pieces

23 and 24 are a part of the following first and

second restraining bodies

30 and 31. That is, the first and

second restraining bodies

30 and 31 are members that are provided in the shape of an annular plate that is substantially the same shape as the steel plate 25 and are arranged coaxially with the cylindrical portion 19, respectively. 23 and 24 extend from the outer peripheral edge of each of the first and

second restraining bodies

30 and 31 to the outer peripheral side. Furthermore,

circular holes

30a and 31a are opened through the first and

second restraining bodies

30 and 31 in the axial direction at an angular interval of 120 ° as in the case of the steel plate 25.

The first and

second restraining bodies

30 and 31 are arranged at one end and the other end of the positioning body 22 in the axial direction, respectively. The first and second engaging

pieces

23 and 24 are bent in advance and are perpendicular to the annular plate-shaped

main bodies

30b and 31b, respectively. And the 1st,

2nd restraint bodies

30 and 31 are arrange | positioned so that the front-end | tip of the 1st and 2nd engaging

pieces

23 and 24 may face the axial direction other end side and one end side at the outer peripheral side of the bottom lamination | stacking part 17, respectively. Is done. The inner circumferences of the first and

second restraining bodies

30 and 31 constitute the same cylindrical surface 27 as the inner circumference of the positioning body 22. Further, the first and

second restraining bodies

30 and 31 are arranged so that the positions of the

holes

30 a and 31 a coincide with the position of the through hole 28 in the circumferential direction, and the

holes

30 a and 31 a form a part of the through hole 28. .

Then, the skeleton 15, the positioning body 22, and the first and

second restraining bodies

30 and 31 are loosened by bringing the tips of the first and

second engagement pieces

23 and 24 into contact with the outer periphery of the bottom laminated portion 17 by temporary caulking. To form a general shape as the core 1 (see FIG. 5).
As described above, the core 1 has the three through holes 28 at an angular interval of 120 ° and the cylindrical surface 27 on the inner periphery.

Then, after the coil 6 is wound around the tooth 10 to constitute the stator 3, the stator 3 is fitted into the cover 33 which is a member on the internal combustion engine side and is fastened with screws. Here, the cylindrical surface 27 that forms the inner periphery of the core 1 is fitted on the cylinder 24 provided on the cover 33. Then, the stator 3 is mounted on the vehicle by screwing the core 1 to the through hole 28 through the shaft portion 36a of the bolt 36 in a state where the core 1 is fitted on the cylinder 24. Further, after the screws are fastened, the tips of the first and second engaging

pieces

23 and 24 are brought into contact with the outer periphery of the bottom laminated portion 17 by main caulking, and the skeleton 15, the positioning body 22 and the first and

second restraining bodies

30, 31 is firmly integrated as a core 1. The shaft portion 36 a is screwed into a screw hole 37 provided in the cover 33.

[Effects of Examples]
According to the core 1 of the embodiment, the steel plate 11 as a raw material is bent so as to have two sides 13 sandwiching the bottom 12 and the bottom 12, and a plurality of lamination units 14 formed by laminating a plurality of steel plates 11, The skeleton 15 is configured by combining them. Further, the skeleton 15 is configured by arranging a plurality of laminated units 14 in an annular shape, and a plurality of bottom laminated parts 17 in which the bottoms 12 of the laminated units 14 are stacked together form a cylindrical portion 19 on the inner peripheral side. The laminated portion 18 protrudes to the outer peripheral side. The cylindrical portion 19 of the skeleton 15 forms part of the yoke 9, and the side laminated portion 18 forms the teeth 10.

Furthermore, the core 1 includes the following positioning body 22 and first and

second engagement pieces

23 and 24. First, the positioning body 22 is disposed on the inner periphery of the cylindrical portion 19 and contacts the inner periphery of the plurality of bottom stacked portions 17 to position the plurality of stacked units 14 in the radial direction. Further, the first engagement piece 23 is hooked on the outer periphery of the bottom laminated portion 17 from the one axial end side and the outer peripheral side of the bottom laminated portion 17. Further, the second engagement piece 24 is hooked on the outer periphery of the bottom stacked portion 17 from the other axial end side and the outer peripheral side of the bottom stacked portion 17.
Thereby, the integrity as the core 1 can be maintained by holding the cylindrical portion 19 present on the inner periphery of the side laminated portion 18. For this reason, even if the number of teeth 10 increases, the integrity as the core 1 can be maintained regardless of the size of the tolerance.

[Modification]
The configuration of the core 1 is not limited to the embodiment, and various modifications can be considered.
For example, the positioning body 22 of the embodiment is provided by laminating the steel plates 25 in the axial direction, but the mode of the positioning body 22 is not limited to the embodiment. For example, the positioning body 22 may be provided by a material other than the magnetic material. For example, the positioning body 22 may be provided by a resin material.

Moreover, although the positioning body 22 of the Example was functioning as a detent with respect to the frame | skeleton 15 by making an outer periphery into the side of a regular polygonal column, the aspect of a detent is not limited to an Example. For example, as shown in FIG. 9, a small protrusion 40 that fits in a gap 39 formed between the bottom laminated portions 17 adjacent in the circumferential direction is provided on the steel plate 25, and the small protrusion 40 is fitted in the gap 39 to prevent rotation. The function may be exhibited.
Further, the core 1 of the embodiment was loosely integrated by temporary caulking before screwing to the cover 33 and then firmly integrated by main caulking after screw tightening. It may be firmly integrated by caulking.

Furthermore, although the core 1 of the embodiment was used as a stator core of the generator 2, the core 1 may be used for an electric motor such as a synchronous motor, an induction motor, and a reluctance motor, and the core 1 is used as a rotor core. Also good.

1 Core 2 Generator (Rotating electric machine)
9 Yoke 10 Teeth 11 Steel plate 12 Bottom portion 13 Side portion 14 Lamination unit 15 Frame 17 Bottom lamination portion 18 Side lamination portion 19 Tube portion 22 Positioning body 23 First engagement piece 24 Second engagement piece

Claims

In a core (1) of a rotating electrical machine (2) comprising a cylindrical yoke (9) and a plurality of teeth (10) projecting outward from the yoke (9),
The steel plate (11) as a material is bent so as to have a bottom (12) and two sides (13) sandwiching the bottom (12),
A skeleton (15) of the core (1) is configured by combining a plurality of lamination units (14) formed by laminating a plurality of the steel plates (11),
In this skeleton (15), a plurality of bottom laminated portions (17) in which the bottom portions (12) of the laminated units (14) are stacked are combined to form a cylindrical portion (19) on the inner peripheral side, and The plurality of lamination units (14) are annularly arranged so that the side lamination part (18) where the side parts (13) are stacked protrudes to the outer peripheral side,
Of the skeleton (15), the cylindrical portion (19) forms all or part of the yoke (9), and the side laminated portion (18) protruding to the outer peripheral side includes all of the teeth (10) or Do some,
A positioning body (22) disposed on the inner periphery of the cylindrical portion (19), for contacting the inner periphery of the plurality of bottom stacked portions (17) and positioning the plurality of stacked units (14) in the radial direction;
A first engagement piece (23) hooked on the outer periphery of the bottom laminate portion (17) from one axial end side and the outer periphery side of the bottom laminate portion (17);
A rotating electrical machine (2) comprising: a second engagement piece (24) hooked to the outer periphery of the bottom laminate portion (17) from the other axial end and the outer peripheral side of the bottom laminate portion (17). Core (1).
In the core (1) of the rotating electrical machine (2) according to claim 1,
The first and second engaging pieces (23, 24) are respectively provided in an annular shape and are part of first and second restraining bodies (30, 31) arranged coaxially with the cylindrical portion (19). It extends from the outer peripheral edge of each of the first and second restraints (30, 31) to the outer peripheral side,
The core (1) of the rotating electrical machine (2), wherein the first and second restraining bodies (30, 31) are respectively disposed at one end and the other end in the axial direction of the positioning body (22).
In the core (1) of the rotating electrical machine (2) according to claim 1 or claim 2,
The core (1) of the rotating electrical machine (2), wherein the core (1) is a stator core, and a coil (6) is wound around the teeth (10).