JP2002281709A - Magnetic wedge for dynamo-electric machine and manufacture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic wedge for dynamo-electric machine capable of attaining easy manufacture, firm fixing, and high strength, and to provide a manufacturing method therefor. SOLUTION: A filler 17 which has prescribed plastic properties is charged into an opening 11c in a slot 11b at teeth 11a on a core 11 of the dynamo-electric machine, and hardened to form the magnetic wedge 16. The filler 17 is formed by kneading glass fiber, iron powder, and epoxy resin, and bunching them up together so as to have prescribed plastic properties suitable for charging. Since the filler 17 has the plastic properties suitable for charging, it is easy to fill, and the magnetic wedge 1 can be manufactured easily. After being hardened, the filler 17 is integrated with the opening 11c and fixed to it firmly, and hardening of the filler 17 makes the glass fiber a reinforcing material, thus providing high strength for the magnetic wedge 16.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a magnetic wedge of a rotating electric machine.

[0002]

2. Description of the Related Art Conventionally, a magnetic wedge is provided at an opening of a slot in order to reduce a harmonic magnetic flux caused by a status lot of a motor. For example, Japanese Patent Application Laid-Open No. 7-131949 discloses a method in which a kneaded material of a paste-like insulator and a magnetic substance powder which becomes solid after curing is filled in an opening of a slot and cured to form a magnetic wedge. ing. By doing so, it is not necessary to insert the magnetic wedge formed in advance, so that damage during insertion of the magnetic wedge can be prevented, and no gap is formed between the opening of the slot and the magnetic wedge. The harmonic magnetic flux can be reduced.

[0003]

Since the magnetic wedge of the conventional rotating electric machine is constituted as described above, the kneaded material of the paste-like insulator and the magnetic powder is too soft, so that the kneaded material is not sagged or deformed during the filling operation. This is problematic in that workability is poor and workability is poor. In addition, since the insulator and the magnetic material powder are merely kneaded, sufficient strength may not be secured after curing. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to obtain a magnetic wedge of a rotating electric machine which is easy to manufacture, is firmly fixed, and has high strength, and provides a manufacturing method thereof.

[0004]

In order to achieve the above object, in a magnetic wedge of a rotating electric machine according to the present invention, an iron slot is formed in a slot formed by a plurality of teeth provided radially on a core. It is formed by mixing or impregnating a mixture obtained by kneading powder and a synthetic resin into a fibrous material, filling a filler having a predetermined plasticity, and curing the mixture. Since the magnetic wedge is filled and hardened with a filler having a predetermined plasticity, it fits well into the shape of the opening of the slot, and since the fibrous material functions as a reinforcing material, it is easy to manufacture and the opening And the strength is high.

[0005] The magnetic wedge is characterized in that a mixture obtained by kneading iron powder and a synthetic resin is impregnated and supported on a glass tape and cured. Glass tape is an excellent reinforcement.

Further, the magnetic wedge is characterized in that a mixture obtained by kneading iron powder and a synthetic resin into glass fibers is cured. Glass fiber functions as an excellent reinforcement.

[0007] The synthetic resin is an epoxy resin. Since the epoxy resin has a good affinity for the glass fiber, the magnetic wedge has a high strength.

[0008] The magnetic wedge is characterized in that a mixture obtained by kneading iron powder and a synthetic resin into a metal fiber is cured. Metal fibers function as excellent reinforcements.

[0009] Further, an engaging portion is provided at a tip portion of the tooth portion so as to protrude or be depressed in the circumferential direction of the core, and the magnetic wedge is engaged with the engaging portion. It is characterized by. Since the magnetic wedge is engaged with the engaging portion, the magnetic wedge can be firmly fixed and can be prevented from dropping out of the opening.

[0010] Further, the opening is narrowed toward the opening end. Since the opening narrows toward the opening end, the magnetic wedge cannot move toward the opening end, and is prevented from dropping out of the opening.

[0011] The magnetic wedge is characterized in that it is wrapped by a wrapping member provided in the opening. Since the magnetic wedge is held by the enclosing member, it is difficult for the magnetic wedge to drop out of the opening.

Further, in the method for manufacturing a magnetic wedge of a rotating electric machine according to the present invention, a mixture obtained by kneading iron powder and a synthetic resin is mixed or impregnated in a fibrous material to produce a filler having a predetermined plasticity. A method comprising a filler manufacturing step, a filler step of filling a filler into an opening of a slot formed by a plurality of teeth provided radially on a core, and a curing step of curing the filled filler. It is. Filling and hardening the filler material having a predetermined plasticity allows the filler material to conform well to the shape of the opening of the slot, and since the fibrous material functions as a reinforcing material, the filler material is hardened and formed. The magnetic wedge is firmly fixed to the opening and has high strength.

Further, a semi-curing step is provided after the filling material manufacturing step, in which the synthetic resin is brought into a semi-cured state having a predetermined plasticity. By setting the synthetic resin in a semi-cured state, the plasticity can be adjusted, the handling is facilitated, and the workability is improved.

Before the filling step, a wrapping member arranging step of arranging the wrapping member at the opening of the slot is provided. It is characterized by being wrapped around. Since the magnetic wedge is held by the enclosing member, it is difficult for the magnetic wedge to drop out of the opening.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 and 2 show an embodiment of the present invention, and FIG. 1 is a sectional view of an induction motor. FIG. 2 is a partially enlarged view of the vicinity of the slot of the stator. In these figures, 10 is a stator,
50 is a rotor. The stator 10 has a hollow cylindrical core 11 and a primary winding 12. The core 11 includes a plurality of teeth 11a radially formed on an inner peripheral portion and the teeth 11a.
a having a slot 11b.

The core 11 has an electromagnetic steel plate 13 punched out in an annular shape so that a plurality of radial protrusions 13a are formed on the inner periphery thereof. The protrusions 13a are located at the same position in the circumferential direction. Thus, a predetermined number of sheets are stacked. And
As shown in FIG. 2, a plurality of teeth 11a are formed by the protruding portions 13a of the stacked electromagnetic steel sheets 13, and a slot 11b having an opening 11c is formed by the teeth 11a adjacent to the teeth 11a. It is something to do.

The protruding portion 13a of the electromagnetic steel plate 13 has a protruding portion 13b protruding in the left-right direction at its tip end in FIG.
have. Therefore, the enlarged portion 11d of the tooth portion 11a is formed by the protrusion 13b of the laminated electromagnetic steel plate 13, and the opening 11c of the slot 11b formed by the enlarged portion 11d is narrower than the back. .

The primary winding 12 is inserted in the slot 11b.
Is inserted into the opening 1 of the slot 11 b of the primary winding 12.
On the 1c side, a slot cell (slot) formed in a strip shape with an insulating material that also serves as an electrical insulation and a fixing of the primary winding 12 is provided.
cell) 15 is provided. A magnetic wedge 16 is provided in the opening 11c of the slot 11b, and is fixed so that the primary winding 12 does not protrude radially inward of the core 11.

The above-described stator 10 is manufactured by:
First, the electromagnetic steel plates 13 are laminated as described above, and the tooth portions 11 are stacked.
A core 11 having a slot 11b formed by a is manufactured. Next, the primary winding 12 is wound around the slot 11b, and the slot cell 15 is inserted. Thereafter, the magnetic wedge 16 is formed. The magnetic wedge 16 is formed by first kneading a relatively short length of glass fiber, iron powder, and epoxy resin to a predetermined hardness suitable for filling, that is, a filling material having a predetermined plasticity in a dumpling shape. 17 is manufactured. The filler 17 is filled in the opening 11c of the slot 11b and then cured to form the magnetic wedge 16.

The rotor 50 has a cylindrical core 51, a secondary conductor 52 and a shaft 53. The core 51 is punched into a disk shape, and a predetermined number of magnetic steel sheets 54 provided with a punched portion 54a at a predetermined interval in the vicinity of the outer periphery thereof so that the punched portion 54a is located at the same position in the circumferential direction. They are laminated and formed into a cylindrical shape, and fitted to the shaft 53.
The core 11 is rotatably supported by a bracket (not shown) via a shaft 53. Then, a slot 51a formed by a punched portion 54a of the laminated electromagnetic steel sheets 54
The secondary conductor 52 is inserted in the second.

As described above, since the filler 17 has an appropriate plasticity, it is plastically deformed in conformity with the shape of the opening 11c when being filled, and after the curing, the filler 17 is formed with the opening 11c. The primary conductor 12 is fixed firmly by the magnetic wedge 16 via the slot cell 15 so as not to move in the radial direction of the core. In addition, since it is formed by curing the filler 17 having a predetermined plasticity, it is easy to manufacture. Further, when the filler 17 hardens, the glass fiber becomes a reinforcing material, and the magnetic wedge 16 having high strength is used.
Becomes

As is well known, the magnetic wedge 1
When the rotor 6 is provided, the slot harmonic component generated by the stator 10 in the rotor 20 is reduced, and the resulting iron loss and copper loss of the rotor 20 are reduced. Therefore, the efficiency of the induction motor is improved.

Embodiment 2 FIG. FIG. 3 is a partially enlarged view of the vicinity of a slot showing another embodiment of the present invention. FIG.
11e, an enlarged portion 11d at a tip end of a tooth portion 11a forming an opening portion 11c of a slot is provided with a core 1e.
1 is a concave portion as an engaging portion provided so as to be concave in the circumferential direction. Reference numeral 21 denotes a magnetic wedge, which enters the recess 11e and engages with the opening 11c of the slot. Recess 11e
When the filling material 17 is filled in the opening 11c with the opening, the recess 11e also enters the recess 11e, and after solidification, is firmly engaged with and supported by the recess 11e. There is no risk of dropping from the part 11c.

Embodiment 3 FIG. FIG. 4 is a partially enlarged view of the vicinity of a slot showing still another embodiment of the present invention. In FIG. 4, reference numeral 11 f denotes a convex portion as an engaging portion provided on the enlarged portion 11 d at the tip of the tooth portion 11 a so as to protrude in the circumferential direction of the core 11. Reference numeral 22 denotes a magnetic wedge, which is engaged with the projection 11f. When the projections 11f are provided and the opening portion 11c is filled with the filler 17, the projections 11
f bites into the filler material 17 and after the solidification, the convex portion 11f
, The magnetic wedge 22 is more firmly supported by the teeth 11a.
Fixed to

In the embodiment shown in FIG. 3 or FIG. 4, the concave portion 11e or the convex portion 1e has a rectangular cross section.
Although 1f is shown, other shapes, such as a triangular shape and a circular arc shape, provide the same effect. FIG.
Alternatively, FIG. 4 shows one in which the concave portion 11e or the convex portion 11f is provided at one position, but a plurality of portions may be provided.

Embodiment 4 FIG. 5 is a partially enlarged view of the vicinity of a slot showing still another embodiment of the present invention. In FIG. 5, reference numeral 11h denotes an enlarged portion at the tip end of the tooth portion 11a. The enlarged dimension linearly increases toward the lower side in FIG. 5, and the opening 11c of the slot 11b formed by the enlarged portion 11h is a core. As it goes inward in the radial direction of the slot 11, that is, toward the opening end of the slot 11 b, it becomes narrower in the circumferential direction of the core 11 in a tapered shape. Reference numeral 23 denotes a magnetic wedge which is filled with the filler 17 in the opening 11c and cured. Opening 11c
Is narrowed toward the opening end, that is, toward the inner diameter side of the core 11 in this embodiment, the magnetic wedge 23 cannot move to the inner diameter side, and the magnetic wedge 23 can be prevented from dropping out of the opening 11c.

In FIG. 5, the enlarged portion 11h is linearly enlarged from the outer diameter side to the inner diameter side of the core 11, but it is not necessary to be linear, and the same effect can be obtained even if it is curved. To play.

Embodiment 5 FIG. 6 is a partially enlarged view of the vicinity of a slot showing still another embodiment of the present invention. In FIG. 6, reference numeral 28 denotes a slot cell, which has a strip-shaped plate-shaped portion 28a made of an insulating material and a wrapping member 28b extending downward from the left and right sides of the plate-shaped portion 28a. Reference numeral 25 denotes a magnetic wedge, which is a wrapping member 28b.
It is provided in the opening 11c in a state of being wrapped around by.

The wrapping member 28b is made of glass cloth, for example, and has flexibility at first. First, the plate-like portion 28a
Into the wide portion of the slot 11b, and the wrapping member 28
6 is extended downward from the left and right sides of the plate-like portion 28a in FIG. 6, and an appropriate plastic filler 17 is filled therein and wrapped by the wrapping member 28b. At this time, the filler 17 adheres to the wrapping member 18b. After that, the filler 17
Is cured to form a magnetic wedge 25.

In the magnetic wedge 25, the opening 11c is narrower than the back, the plate-like portion 28a is disposed deeper than the opening 11c, and the magnetic wedge 25 is made of glass cloth having high mechanical strength. Since it is supported by the tip of the tooth portion 11a via the wrapping member 28b and the plate-like portion 28a, it is difficult for the tooth portion 11a to drop off from the opening 11c.

Embodiment 6 FIG. FIG. 7 is a configuration diagram of a filler showing still another embodiment of the present invention. In FIG. 7, first, a kneading material 32 obtained by kneading iron powder and epoxy resin.
Is impregnated and adhered to the glass cloth 31 and carried thereon, and then wound into a spiral shape and then crushed to form a filler 33 having a shape and plasticity suitable for being pushed into the opening 11c. This filler 33 is supplied to the opening 11c of the slot 11b.
And then cured to form a magnetic wedge.

Further, for example, a filler obtained by impregnating and supporting a kneading material 32 on a glass cloth 31 can be formed by squaring or other shapes. Since glass fibers and glass tape have good affinity with epoxy resin, a magnetic wedge with high strength can be obtained.

Embodiment 7 Embodiment 1 shown above
In Steps 6 to 6, the filler 17 is semi-cured in order to adjust the plasticity. The opening 17c of the slot is filled with the filling material 17 which has been semi-cured to have an appropriate hardness. Since the filler 17 has appropriate plasticity, the shape of the teeth 1 is easily adjusted to the shape of the opening 11c of the slot 11b.
1a. Here, the semi-cured state is a state in which the heat treatment is completed before the epoxy resin is completely cured, and is completely cured when the heat treatment is performed again. In the semi-cured state, the viscosity of the epoxy resin becomes high and it becomes difficult to adhere to hands, so that handling and filling become easy.

In each of the above embodiments, other organic fibers or cloths may be used instead of the glass fibers or glass cloth. Further, a kneading material obtained by kneading iron powder and epoxy resin is impregnated and supported on a cloth made of metal fiber, or a dumpling having moderate plasticity by kneading iron powder, epoxy resin and metal fiber. It can also be used in the form. In particular, when a ferromagnetic material is used for the metal fiber, the magnetic properties of the magnetic wedge are further improved.

[0035]

Since the present invention is constructed as described above, it has the following effects.

A kneaded mixture of iron powder and synthetic resin is mixed or impregnated with a fibrous material in the opening of a slot formed by a plurality of teeth provided radially on the core, and has predetermined plasticity. Since the magnetic wedge is formed by filling and curing the filler, the magnetic wedge filled and cured with the filler having a predetermined plasticity is well adapted to the shape of the opening of the slot, and the fibrous material is Since it functions as a reinforcing member, a magnetic wedge that is easy to manufacture, is firmly fixed, and has high strength can be obtained.

The magnetic wedge is characterized by being a material obtained by kneading an iron powder and a synthetic resin and impregnating and supporting a glass tape, and curing the glass tape. Therefore, the glass tape is an excellent reinforcing material. Thus, a magnetic wedge with high strength can be obtained.

Further, since the magnetic wedge is characterized by being a mixture obtained by kneading iron powder and synthetic resin into a mixture of glass fibers and curing the mixture, the glass fibers function as an excellent reinforcing material. Thus, a magnetic wedge with high strength can be obtained.

Further, since the synthetic resin is an epoxy resin, the epoxy resin has a good affinity for glass fiber, so that a magnetic wedge with high strength can be obtained.

The magnetic wedge is characterized by being a mixture obtained by kneading iron powder and a synthetic resin into a mixture of metal fibers and curing the mixture, so that the metal fibers function as an excellent reinforcing material. Thus, a magnetic wedge with high strength can be obtained.

Further, an engaging portion is provided at the tip of the tooth portion so as to protrude or be depressed in the circumferential direction of the core, and the magnetic wedge is engaged with the engaging portion. Since the magnetic wedge is engaged with the engaging portion, it is possible to obtain a magnetic wedge which is firmly fixed and does not fall off from the opening.

The opening is narrowed toward the opening end. Since the opening is narrowed toward the opening end, the magnetic wedge is formed at the opening end. In the opening direction, and is prevented from falling out of the opening.

The magnetic wedge is characterized by being wrapped by the wrapping member provided in the opening, so that the magnetic wedge is held by the wrapping member, so that the magnetic wedge is less likely to fall out of the opening. .

Further, in the method of manufacturing a magnetic wedge for a rotating electric machine according to the present invention, a filler having predetermined plasticity is produced by mixing or impregnating a mixture of iron powder and a synthetic resin in a fibrous material. A method comprising a filler manufacturing step, a filler step of filling a filler into an opening of a slot formed by a plurality of teeth provided radially on a core, and a curing step of curing the filled filler. So that
Filling and curing the filler with the prescribed plasticity,
The filling material conforms well to the shape of the opening in the slot, and the fibrous material functions as a reinforcing material, so that the magnetic wedge formed by curing the filling material is firmly fixed in the opening and has strength. Will be high.

[0045] Further, a semi-curing step of making the synthetic resin a semi-cured state having a predetermined plasticity is provided after the filling material manufacturing step. Can be adjusted, handling becomes easy, and workability is improved.

Before the filling step, there is provided a wrapping member arranging step of arranging the wrapping member at the opening of the slot. Since the magnetic wedge is held by the wrapping member, the magnetic wedge is not easily dropped from the opening.

[Brief description of the drawings]

FIG. 1 is a sectional view of an induction motor showing an embodiment of the present invention.

FIG. 2 is a partially enlarged view of the vicinity of a slot of a stator of the induction motor of FIG. 1;

FIG. 3 is a partially enlarged view of the vicinity of a slot showing another embodiment of the present invention.

FIG. 4 is a partially enlarged view of the vicinity of a slot showing another embodiment of the present invention.

FIG. 5 is a partially enlarged view of the vicinity of a slot showing another embodiment of the present invention.

FIG. 6 is a partially enlarged view of the vicinity of a slot showing another embodiment of the present invention.

FIG. 7 shows another embodiment of the present invention, and is a configuration diagram of a filler.

[Explanation of symbols]

10 Stator, 11 Core, 11a Tooth, 11b Slot, 11c Opening, 11d, 11h Enlarged Part, 1
1e concave portion, 11f convex portion, 12 primary winding, 16, 2
1,22,23,25 Magnetic wedge, 17 filler, 28
Slot cell, 28b wrapping member, 31 glass cloth, 32 kneading material, 33 filler.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Masaya Inoue 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Yoshihiro Tani 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 3 F term in Ryo Electric Co., Ltd. (reference) 5H002 AA07 AA08 AE06 5H604 AA08 BB01 BB03 CC01 CC05 CC15 DA02 DA06 DA15 DB02 DB12 DB14 DB25 PB03 QC01

Claims (11)

[Claims] 1. A filler obtained by kneading iron powder and a synthetic resin in a fibrous material or by impregnating and supporting the material in an opening of a slot formed by a plurality of teeth provided radially on a core. The magnetic wedge of the rotating electric machine formed by filling and curing. 2. The magnetic machine according to claim 1, wherein the magnetic wedge is made by kneading an iron powder and a synthetic resin and impregnating and supporting the glass tape. wedge. 3. The magnetic wedge for a rotating electric machine according to claim 1, wherein the magnetic wedge is obtained by kneading an iron powder and a synthetic resin into a glass fiber and curing the mixture. 4. The magnetic wedge according to claim 2, wherein the synthetic resin is an epoxy resin. 5. The magnetic wedge of a rotary electric machine according to claim 1, wherein the magnetic wedge is obtained by kneading iron powder and a synthetic resin, mixing a metal fiber, and curing the mixture. 6. An engaging portion provided at a tip portion of a tooth portion so as to protrude or be depressed in a circumferential direction of a core, and a magnetic wedge is engaged with the engaging portion. The magnetic wedge of the rotating electric machine according to claim 1, wherein: 7. The magnetic wedge of a rotating electric machine according to claim 1, wherein the opening is narrowed toward the opening end. 8. The magnetic wedge of a rotating electric machine according to claim 1, wherein the magnetic wedge is wrapped by a wrapping member provided in the opening. 9. A filler producing step of producing a filler having predetermined plasticity by mixing or impregnating a mixture obtained by kneading iron powder and a synthetic resin with a fibrous material, and radially applying the filler to a core. A method for manufacturing a magnetic wedge of a rotating electric machine, comprising: a filling step of filling an opening of a slot formed by a plurality of provided teeth; and a curing step of curing the filled filler. 10. The method for manufacturing a magnetic wedge of a rotating electric machine according to claim 9, further comprising a semi-curing step of bringing the synthetic resin into a semi-cured state having a predetermined plasticity after the filling material manufacturing step. . 11. A wrapping member arranging step of arranging a wrapping member in an opening of the slot before the filling step,
The method for manufacturing a magnetic wedge of a rotating electric machine according to claim 9, wherein the filling step includes filling the filler between the wrapping members and then wrapping the filler with the wrapping member.