JP4367004B2 - Rotor for rotating electrical machines - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotor used in a rotating electrical machine such as a generator or an electric motor.
[0002]
[Prior art]
For example, a rotor of a permanent magnet type rotating electrical machine used for an electric vehicle or the like includes a rotating shaft, a laminated core (iron core) inserted through the rotating shaft, and a non-magnetic annular plate called an end plate sandwiching the laminated core. It is configured.
[0003]
The laminated core is a laminated body of a plurality of annular electromagnetic steel plates, into which permanent magnets are inserted. Therefore, a hole for inserting a magnet is formed in each of the electromagnetic steel plates constituting the laminated core. Further, in order to join the electromagnetic steel sheets, a convex portion when viewed from one surface and a crimp portion that becomes a concave when viewed from the other surface are formed by drawing or the like. Each electromagnetic steel plate is joined by caulking and joining the convex portion and the concave portion of each electromagnetic steel plate. In this way, by forming the crimped portion on the electromagnetic steel sheet, the electromagnetic steel sheet can be easily joined.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-112481
[Problems to be solved by the invention]
However, since there is this caulking portion, a protruding portion exists on the end face of the laminated core. For this reason, among the end plates that sandwich the laminated core, a gap is generated between the end plate on the protruding portion side and the laminated core. Such a gap causes various problems such as leakage of the magnet fixing adhesive and contamination of foreign matter inside the rotor.
[0006]
Patent Document 1 discloses a rotor in which a convex portion on an end face of a laminated core and an end plate provided with a concave portion at a position corresponding to the convex portion are caulked and joined. The convex part of the laminated core can be absorbed by the concave part of the end plate, and the gap between the laminated core and the end plate can be prevented.
[0007]
However, since the concave portion formed in the end plate in this rotor is provided for the purpose of joining with the laminated core, it is formed in a position and a size corresponding to the convex portion of the laminated core. For this reason, when joining the end plate to the laminated core, it is necessary to show the phase of the unevenness, which is troublesome.
[0008]
Therefore, an object of the present invention is to provide a rotor for a rotating electrical machine that can more easily reduce or eliminate a gap between an end plate and a laminated core.
[0009]
[Means for Solving the Problems]
A rotor for a rotating electrical machine according to the present invention is a laminated body in which a plurality of annular steel plates each having a convex portion for bonding are laminated, and a laminated body in which a protruding portion that is a convex portion for bonding projects on an end surface, and the laminated body An annular end plate, and an annular spacer having the same size as the annular steel plate and having a through-hole through which the protrusion penetrates, the annular spacer protruding from the protrusion The annular end plate disposed between the annular end plate and the laminated body and disposed on the projecting side of the projecting portion is a recess for housing the projecting portion projecting from the annular spacer, and the projecting portion characterized have a recess of greater than projections size, the recess, with the magnet provided in the laminated body is provided in a position and size of overlap with part of the magnet hole where the adhesive is injected, to And
[0010]
According to the above configuration, since the protrusion of the laminate can be accommodated in the through hole provided in the annular spacer, the gap between the laminate and the annular end plate on the protrusion can be reduced or eliminated. .
[0011]
Here, the rotating electrical machine may be a generator, an electric motor, or a combination of the two. Moreover, the number of annular spacers may be one or more, and the material and thickness thereof are not particularly limited. In addition, the through hole is preferably of a size that can be caulked and joined to the protrusion, but may have other sizes. The recess is preferably an annular groove . Et al is, in another preferred embodiment, the space for accommodating the projection portion formed by the annular spacer and the protrusion portion side of the annular end plate has a height above the height of at least the protrusion.
[0012]
Another rotor for a rotating electrical machine according to the present invention is a laminated body in which a plurality of annular steel plates formed with bonding convex portions are laminated, and a laminated body in which protrusions that are bonding convex portions protrude from the end surface; A rotor for a rotating electrical machine having an annular end plate for sandwiching a laminate, and the annular end plate disposed on the protruding side on the protruding portion side is a recessed portion for accommodating the protruding portion, and is larger than the protruding portion. have a recess of size, the recess together with the magnet provided in the laminated body is provided in a position and size of a portion which overlaps the magnet hole where the adhesive is injected, characterized in that.
[0013]
According to the above means, since the protrusion of the laminate can be accommodated in the recess provided in the annular end plate, the gap between the laminate and the annular end plate on the protrusion side can be reduced or eliminated. . In addition, if the concave portion is an annular groove, the phase relationship with the protruding portion does not become a problem when the annular end plate is attached. Therefore, an annular end plate can be attached more easily.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a top view of a rotor 10 according to an embodiment of the present invention, and FIG.
[0016]
The rotor 10 is assumed to be a rotor for a rotating electrical machine used in an electric vehicle or a hybrid vehicle. However, it can of course be used for rotating electrical machines for other purposes by appropriately changing the configuration.
[0017]
The rotor 10 includes a rotating shaft 12, a laminated core 14 inserted through the rotating shaft 12, an end plate 16, and the like. In the rotary shaft 12, an output shaft portion 19 and a flange portion 20 are integrally formed, and the laminate core 14 and the end plate 16 are inserted into the flange portion 20. The end plate 16 sandwiches the laminate core 14 between a lower end plate 28 arranged on the lower end side (right hand direction in FIG. 2) of the laminate core 14 and an upper end plate 30 arranged on the upper end side. Further, an annular spacer 18 described later is provided between the upper end plate 30 and the laminated body core 14.
[0018]
The laminated core 14 is formed by laminating an annular electromagnetic steel plate 22 described later, and permanent magnets for four poles are embedded therein. Each pole is configured by arranging two magnets 32 in a V shape. In addition, a protrusion 34 is formed on the upper end surface of the laminate core 14.
[0019]
Needless to say, the number of poles of the magnet 32 is not limited to four, and the arrangement thereof is not limited to the V shape. Further, the protrusion 34 is preferably provided between the magnetic poles for reasons such as strength, but may be at another position.
[0020]
In FIG. 1 and FIG. 2, the scale of the magnet 32, the protrusion 34, the electromagnetic steel plate 22, and the like are drawn with slightly different scales for easy viewing. That is, in practice, the magnet 32 is larger and the protrusion 34 is smaller. Moreover, although the thickness of the electromagnetic steel sheet 22 is thinner, the scale has been changed for ease of viewing. Hereinafter, the same applies to all drawings.
[0021]
The laminated core 14 is formed by laminating a plurality of annular electromagnetic steel plates 22 having a thickness of about 0.3 mm as shown in FIG. 3A is a top view of the electromagnetic steel plate 22, and FIG. 3B is a WW cross-sectional view.
[0022]
The electromagnetic steel plate 22 is provided with a magnet through hole 36 for forming a magnet insertion hole in the laminate core 14. The magnet through-hole 36 is slightly larger than the magnet 32 so that a gap is formed between the magnet 32 and the magnet insertion hole. A magnet fixing adhesive is injected into the gap.
[0023]
Further, the electromagnetic steel plate 22 is provided with a caulking portion 38 between the magnet through holes 36. The caulking portion 38 is formed by extruding the electromagnetic steel plate 22 from one surface, and is a concave portion 38b when viewed from one surface and a convex portion 38a when viewed from the other surface. In the present embodiment, the caulking portion 38 has a rectangular shape of 1 mm × 4 mm, and its height is about 0.5 mm.
[0024]
Each electromagnetic steel plate 22 is joined by press-fitting the convex portion 38a of the electromagnetic steel plate 22 into the concave portion 38b of another electromagnetic steel plate. The laminated body core 14 is formed by performing this joining for all the electromagnetic steel sheets.
[0025]
The caulking portion 38 and the magnet through hole 36 are provided at the same position and size in all the electromagnetic steel sheets 22. Therefore, by crimping the convex portion 38a and the concave portion 38b, the electromagnetic steel plates 22 can be easily joined without shifting the position of the magnet through hole 36.
[0026]
A magnet insertion hole is formed in the laminate core 14 formed by laminating several hundred electromagnetic steel plates 22 as described above. In addition, a protrusion 34 that is a caulking portion 38 is present on the upper end surface.
[0027]
Of course, the thickness of the electromagnetic steel plate 22, the shape and size of the crimping portion 38, and the like can be changed as appropriate. In that case, what is necessary is just to change suitably the plate | board thickness of the annular spacer 18 mentioned later, the position and magnitude | size of the annular groove 42 of the upper end plate 30, etc., suitably.
[0028]
Next, the upper end plate 30 will be described with reference to FIG. 4A is a top view of the upper end plate 30, and FIG. 4B is a cross-sectional view taken along the line XX.
[0029]
The upper end plate 30 is an annular plate made of a nonmagnetic material, and the inner periphery and outer periphery thereof are substantially the same as those of the electromagnetic steel plate 22. A crimping claw 40 is formed on the inner peripheral side of the upper end plate 30, and the inner periphery of the crimping claw is the same as or slightly smaller than the outer diameter of the flange portion 20. Therefore, when the upper end plate 30 is press-fitted into the flange portion 20, the crimping claws 40 are crimped, and the upper end plate 30 can be joined to the flange portion 20.
[0030]
An annular groove 42 is provided on the entire surface of the upper end plate 30 on the laminated core 14 side. The annular groove 42 has a position and a size that can accommodate the protrusion 34 of the laminated core 14. In addition, a part thereof overlaps with a magnet insertion hole provided in the laminated core 14.
[0031]
The depth of the annular groove 42 can be appropriately changed according to the height of the protrusion 34 and the thickness of the annular spacer 18 described later. In the present embodiment, the depth is about 0.3 mm. Yes. This is because the total value of the depth of the annular groove 42 and the thickness of the annular spacer 18 is slightly larger than the height of the protrusion 34.
[0032]
As described above, since the annular groove 42 for providing the projection 34 is provided over the entire circumference, it is not necessary to consider the phase relationship with the projection 34 when assembling to the rotor 10 and can be easily assembled. Can do.
[0033]
In the present embodiment, the annular groove has a position and size that overlap with a part of the magnet insertion hole, but it does not necessarily have to overlap. The shape of the groove is preferably an annular shape, but may be another shape. For example, it may be a circular recess that encloses all the protrusions. Moreover, the recessed part provided for every protrusion part may be sufficient. The depth is not limited to the above depth. Any other shape, position, and size may be used as long as the protrusion can accommodate the protrusion.
[0034]
An annular spacer 18 as shown in FIGS. 5A and 5B is disposed between the upper end plate 30 and the laminated core 14. This is an annular plate having the same inner periphery and outer periphery as the electromagnetic steel plate 22. In the present embodiment, an annular steel plate punched from the steel plate for the electromagnetic steel plate 22 is used as the annular spacer 18. Therefore, the wall thickness is 0.3 mm, which is the same as that of the electromagnetic steel sheet 22, and is made of a magnetic material. By using the same steel plate as the electromagnetic steel plate 22, a part of the manufacturing process can be shared.
[0035]
The annular spacer 18 is provided with a magnet through hole 36 at the same position and size as the electromagnetic steel plate 22. A through hole 44 is provided at a position corresponding to the protrusion 34 of the laminated core 14. The through hole 44 is the same as or slightly smaller than the protrusion 34, and has a size that allows caulking to the protrusion 34.
[0036]
As described above, the annular spacer 18 can be easily fixed to the electromagnetic steel plate 22 by making the through hole 44 large enough to be caulked and joined to the protrusion 34. In this case, the phase relationship between the through hole 44 and the projection 34 becomes a problem. However, since the position of the projection 34 can be confirmed through the magnet through hole 36, the through hole 44, and the like at the time of attachment, alignment is easy. it can.
[0037]
The size of the through hole 44 is preferably a size that can be crimped and joined to the protrusion 34, but may be other sizes as long as the protrusion 34 can be accommodated. In that case, what is necessary is just to fix the annular spacer 18 to the electromagnetic steel plate 22 by another means.
[0038]
A case where the laminated core 14, the annular spacer 18, and the upper end plate 30 are assembled to the rotor 10 will be described with reference to FIG. 6. FIG. 6 is an enlarged view of a portion B in FIG.
[0039]
A protrusion 34 protrudes from the upper end of the laminate core 14 in which the electromagnetic steel plates 22 are laminated. Therefore, when a flat upper end plate not provided with the annular groove 42 or the like is attached, a gap is generated between the upper end plate and the laminate core 14.
[0040]
Therefore, as shown in FIG. 6, an annular spacer 18 is disposed between the upper end plate 30 and the laminate core 14. By storing a part of the protrusion 34 in the through hole 44 provided in the annular spacer 18, the portion protruding from the annular spacer 18 can be reduced.
[0041]
In the present embodiment, the height of the protrusion 34 is, for example, about 0.5 mm, and the thickness of the annular spacer 18 is about 0.3 mm. Therefore, the height protruding from the annular spacer 18 can be suppressed to about 0.2 mm.
[0042]
Further, the protrusion 34 protruding from the annular spacer 18 is further accommodated in an annular groove 42 provided in the upper end plate 30. Since the depth of the annular groove 42 is about 0.3 mm as described above, the protrusion 34 is completely accommodated in the space formed by the through hole 44 and the annular groove 42.
[0043]
As described above, the through hole 44 of the annular spacer 18 and the annular groove 42 of the upper end plate 30 are configured to accommodate the protrusions 34, thereby easily preventing the gap between the upper end plate 30 and the laminate core 14. Can do.
[0044]
In the present embodiment, both the upper end plate 30 and the annular spacer 18 are used, but only one of them may be used. That is, as shown in FIG. 7, the protrusion 34 may be accommodated only by the annular groove 42 of the upper end plate 30 without using the annular spacer 18. In this case, the annular groove 42 is desirably provided at a position and size overlapping with a part of the magnet insertion hole, and desirably has a depth at least equal to the height of the protrusion 34. In this case, the annular groove 42 becomes deep and the thickness of the portion becomes thin. Therefore, the material and the thickness of the upper end plate 30 are appropriately adjusted in consideration of strength. In addition, the numerical values such as the height shown here can be changed as appropriate, and other projection heights, wall thicknesses, groove depths can be used as long as at least a part of the projection height can be accommodated. That's fine.
[0045]
Alternatively, a plurality of annular spacers 18 may be used, or a thicker annular spacer 18 may be used to accommodate the protrusion 34 only with the through hole 44.
[0046]
In the present embodiment, the gap between the laminated core 14 and the upper end plate 30 is completely eliminated, but it is not always necessary to completely eliminate it. The height of the space formed by the annular spacer 18 and the upper end plate 30 is preferably larger than the protrusion 34, but may be smaller in some cases.
[0047]
Such a rotor 10 is assembled in the following procedure. First, the lower end plate 28 and the laminated core 14 in which the annular spacer 18 is caulked in advance are inserted into the flange portion 20. In this state, the magnet 32 is inserted into the magnet insertion hole, and an adhesive is injected into the gap between the magnet insertion hole and the magnet 32. Next, the upper end plate 30 is inserted into the flange portion 20.
[0048]
The above operation is performed with the flange portion 20 on the lower side and the output shaft portion 19 on the upper side, but after the upper end plate 30 is attached, this is turned upside down. That is, the upper end plate 30 is on the lower side and the lower end plate 28 is on the upper side. This is for evenly extending the magnet fixing adhesive. By reversing, the adhesive spreads evenly in the gaps between the magnet insertion holes due to the osmotic pressure, and at the same time, unnecessary adhesive gathers on the upper plate 30 side. Since there is no gap between the upper end plate 30 and the laminated body core 14, the collected adhesive does not flow out to the outside. Further, since the annular groove 42 is provided at a position and a size so as to overlap with a part of the magnet insertion hole, excess adhesive is accumulated in the annular groove 42. Therefore, the adhesive injected more than necessary is not pushed out and leaks from the gap between the electromagnetic steel sheets 22. Thus, the amount of adhesive remaining in the magnet insertion hole can be adjusted by providing the annular groove 42 at a position and size that partially overlaps the magnet insertion hole.
[0049]
As described above, the gap between the end plate and the laminated core can be easily reduced or eliminated.
[0050]
【The invention's effect】
As described above, according to the present invention, the gap between the end plate and the laminated core can be reduced or eliminated more easily.
[Brief description of the drawings]
FIG. 1 is a top view of a rotor according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line VV in FIG.
3A is a top view of an electrical steel sheet, and FIG. 3B is a WW cross-sectional view.
4A is a top view of an upper end plate, and FIG. 4B is a sectional view taken along line XX.
5A is a top view of an annular spacer, and FIG. 5B is a YY sectional view.
FIG. 6 is an enlarged view of a portion B in FIG.
FIG. 7 is a diagram illustrating another embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Rotor, 12 Rotating shaft, 14 Laminated body core, 16 End plate, 18 Annular spacer, 22 Magnetic steel plate, 30 Upper end plate, 32 Magnet, 34 Protruding part, 36 Magnet through-hole, 38 Caulking part, 38a Convex part, 38b Recess, 42 annular groove, 44 through hole.

Claims (7)

A laminated body in which a plurality of annular steel plates each having a convex portion for bonding are laminated, and a laminated body in which a protruding portion that is a convex portion for bonding protrudes from an end surface;
An annular end plate sandwiching the laminate;
An annular spacer having the same size as the annular steel plate, and an annular spacer in which a through-hole through which the protrusion passes is formed,
Have
The annular spacer is disposed between the annular end plate disposed on the protruding side of the protruding portion and the laminate,
Annular end plate arranged on the protruding side of the protrusion, a recess for accommodating the projecting portion projecting from the annular spacer, have a recess of larger size than the protruding portion of the protruding,
The recess is provided at a position and size overlapping with a part of a hole for a magnet that is provided in the laminate and into which an adhesive is injected together with the magnet.
Rotating electric machine rotor, wherein the this. The rotor for a rotating electrical machine according to claim 1,
The rotor for a rotating electrical machine is characterized in that the through hole has a size capable of being caulked and joined to the protrusion. The rotor for a rotating electrical machine according to claim 1 or 2,
The rotor for a rotating electrical machine, wherein the annular spacer is an annular steel plate in which a through hole is formed instead of the bonding convex portion. The rotor for a rotating electrical machine according to any one of claims 1 to 3,
The rotor for a rotating electrical machine, wherein the recess is an annular groove. A rotor for a rotating electrical machine according to any one of claims 1 to 4 ,
A rotor for a rotating electrical machine characterized in that a space for accommodating a protrusion formed by an annular spacer and an annular end plate on the protrusion side has a height at least higher than the height of the protrusion. A laminated body in which a plurality of annular steel plates each having a convex portion for bonding are laminated, and a laminated body in which a protruding portion that is a convex portion for bonding protrudes from an end surface;
An annular end plate sandwiching the laminate;
A rotor for a rotating electrical machine having
Annular end plate arranged on the protruding side of the protrusion, a recess for accommodating the projections, have a recess of larger size than the protrusions,
The recess is provided at a position and size overlapping with a part of a hole for a magnet that is provided in the laminate and into which an adhesive is injected together with the magnet.
Rotating electric machine rotor, wherein the this. The rotor for a rotating electrical machine according to claim 6 ,
The rotor for a rotating electrical machine, wherein the recess has a height at least equal to or greater than a depth of the protrusion.

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