JPH04351440A - Magnetic wedge for slot of rotary electric machine - Google Patents

Abstract

PURPOSE:To provide a cheap magnetic wedge optimal for various motors which can be inserted without deteriorating withstand voltage characteristics or damaging coil and which does not cause reduction of the amount of coil in the slot of the stator of motor. CONSTITUTION:A thin amorphous band 4b of several mum several tens mum thick having substantially same length as the dimension of stator core is bonded to the central part on the surface of nonmagnetic leaf material 4a such as polyester film or aromatic aramid paper thus obtaining a magnetic wedge 4. The nonmagnetic leaf material 4a such as polyester film or aromatic aramid paper is integrated with the thin amorphous band 4b into a sheet and thereby the magnetic wedge can be inserted into the stator slot by means of a conventional automatic inserter. Consequently, insertion of magnetic wedge does not cause reduction of the amount of coil to be placed in the slot of the stator of motor.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic wedge for slots which is inserted into a slot in a stator core of a rotating electric machine so as to prevent a coil from escaping in the slot, and in particular, it relates to a magnetic wedge for slots which is inserted into a slot in a stator core of a rotating electric machine so as to prevent a coil in the slot from escaping. The present invention relates to a magnetic wedge for a slot in a rotating electrical machine.

0002

2. Description of the Related Art For the purpose of improving the efficiency and power factor of an electric motor or reducing electromagnetic vibration noise, it is common practice to insert magnetic wedges into slot openings of a stator core. By inserting this magnetic wedge, the magnetic imbalance between the slot opening of the stator core and the core teeth is corrected, magnetic flux distortion in the air gap between the rotor and stator is eliminated, and various characteristics of the motor are improved. Improved. The early conventional magnetic wedges were made of a material made by compression molding iron powder, so they had a relatively large thickness. The characteristics of the electric motor are
Typically, the improvement is proportional to the amount of coils housed within the slot.

[0003] Therefore, in the conventional thick magnetic wedge,
The effective cross-sectional area of the slot is lost, and as a result, the effect of improving the characteristics by inserting the magnetic wedge is low.Furthermore, because the strength of the wedge is low, it may be damaged during the process of inserting it into the slot or by an external shock while it is installed. There was a simple drawback. Therefore, for the purpose of eliminating such drawbacks, a thin magnetic wedge disclosed in Japanese Utility Model Application Laid-Open No. 59-18548 was provided. This is made by coating an insulating thin sheet material with magnetic powder such as ferrite and integrating it to form a magnetic wedge.

However, this conventional thin magnetic wedge requires large-scale, automated and expensive equipment to coat and integrate magnetic powder such as ferrite onto a thin sheet material. Furthermore, if the magnetic powder is coated too thickly, there is a problem that the magnetic layer will peel off during the slot insertion process. Furthermore, since the coated surface is on the side of the coil inside the slot, the withstand voltage characteristics of the coil are reduced. Furthermore, there was a drawback that the coil was easily damaged by the magnetic layer.

On the other hand, magnetic wedges using an amorphous alloy have been introduced in JP-A-58-19138, JP-A-58-22554, and JP-A-59-175350. The magnetic wedge disclosed in these documents is made by laminating amorphous sheets so that the vertical cross section is approximately trapezoidal, and bonding the laminated sheets with an adhesive, or interposing a synthetic resin layer containing magnetic powder between the laminated sheets. The structure is designed to integrate the two. Furthermore, a magnetic wedge made by molding amorphous magnetic fiber into a predetermined shape using an organic binder has also been introduced.

[0006]

However, the laminated magnetic wedges introduced above require many types of amorphous sheets having different width dimensions, and it is also necessary to bond many laminated layers together. For this reason, many steps are required for manufacturing, and it is difficult to ensure the strength required for the magnetic wedge through adhesive strength. Furthermore, the interposition of adhesive or synthetic resin layers between multiple laminated layers, or the integral molding of magnetic fibers with an organic binder, has the problem of increasing the volume of the wedge, resulting in deterioration of motor characteristics and increase in size. A first object of the present invention is to provide a magnetic wedge for a slot in a rotating electrical machine that is thin and easy to manufacture, minimizing the space occupied within the slot.

[0007] A second object of the present invention is to provide a rotating mechanism having sufficient strength so that the magnetic material part is difficult to separate from the non-magnetic thin sheet material which is the base material that holds the magnetic material part together during automatic insertion into the slot. An object of the present invention is to provide a magnetic wedge for a slot in an electric machine. A third object of the present invention is to provide a magnetic wedge for a slot of a rotating electrical machine that can prevent damage to the coil in the slot when inserted into the slot. A fourth object of the present invention is to provide a magnetic wedge for a slot of a rotating electrical machine that can improve the voltage resistance characteristics of a coil.

[0008]

[Means for Solving the Problems] According to the present invention, firstly, a slot for a stator core of a rotating electrical machine is inserted so as to close the opening of the slot to prevent a coil from escaping within the slot. A magnetic wedge consisting of a non-magnetic thin material such as polyester film or aromatic aramid paper, and an amorphous sheet glued to the opposite side of the thin material from the side facing the coil when inserted into the slot. Consisting of
An improved magnetic wedge can be provided.

Second, the magnetic wedge for the slot includes a first non-magnetic thin material such as a polyester film or aromatic aramid paper, and a surface of the first thin material facing the coil side when inserted into the slot. an amorphous sheet glued to
An improved magnetic wedge can be provided comprising a second non-magnetic thin sheet material disposed on and adhered to the amorphous sheet so as to cover the amorphous sheet.

0010

[Operation] In the present invention, an amorphous thin strip having approximately the same length as the stator core dimension and a film thickness of several microns to several tens of microns is attached to the center of the surface of a non-magnetic thin material such as a polyester film or aromatic aramid paper. By adhering the two, it is possible to provide an inexpensive magnetic wedge material in which the two are in close contact with each other.

[0011] Therefore, since the non-magnetic thin material such as polyester film or aromatic aramid paper and the amorphous thin strip are in the form of an integrated sheet, it is difficult to insert the magnetic wedge into the stator slot using the conventional method. An automatic insertion machine can be used. Furthermore, the effect of improving the characteristics of the magnetic wedge can be exhibited without reducing the amount of coils in the slot of the motor stator due to the insertion of the magnetic wedge. Additionally, the thinner non-magnetic thin sheet material has an added effect of preventing the amorphous ribbon from being peeled off or damaged during automatic insertion.

0012

[Example] Figures 1 to 4 will be explained below regarding the first embodiment of the invention.
Explain with reference to. Slot 2 in stator core 1
The magnetic wedge 4 for preventing the escape of the coil 3 housed therein is made of a non-magnetic thin material 4a such as polyester film or aromatic aramite paper, which is commonly used in electric motors as a material for slot wedges. Film thickness several μm on one side
~Amorphous sheet or tape of about 10 μm 4
b (hereinafter referred to as sheet)
The two are integrated by gluing them together. The amorphous sheet 4b of this example is made of 88% Co, Fe
6%, 75% of the first material consisting of 4% Ni, 2% Nb
and 25% of a second material consisting of 40% Si and 60% B is used. As shown in FIG. 2, the magnetic wedge 4 thus formed is placed inside the opening 2a of the slot 2 in order to prevent the coil 3 in the slot 2 of the stator core 1 from jumping out from the opening 2a. is inserted into. In this inserted state, the bending direction of the magnetic wedge 4 is set so that the amorphous sheet 4b is located on the opposite side of the coil 3, and the thin sheet material 4a and the amorphous sheet 4
The dimension b is Longitudinal at the slot.
It is set to be approximately the same as Length.

[0013] Since the present invention is configured as described above,
Since the film thickness of the amorphous sheet 4b is as thin as several micrometers to several tens of micrometers, the amount of coils 3 that can be stored in the slot 2 is almost the same as the conventional wedge made of non-magnetic thin material. Not only is it possible to do this, but also the effect of the magnetic wedge can be demonstrated. This magnetic wedge 4 is formed into an integrated sheet by adhering an amorphous sheet 4b to a non-magnetic thin sheet material 4a, and can be easily applied to a conventional automatic wedge insertion machine. Since the amorphous material has a sheet adhesive structure rather than a magnetic powder coating, and the number of adhesive layers is as small as one, the probability of a peeling accident between the two members 4a and 4b is extremely low, and the overall Can maintain strength. In addition, since the amorphous sheet 4b is located on the opposite side of the coil 3, the withstand voltage strength of the coil 3 is improved, and since the coil 3 is in contact with the thin sheet material 4a, it is possible to prevent the coil from being damaged by the magnetic layer. .

A comparison of the characteristics between the case where the magnetic wedge of the present invention is applied and the case where a conventional non-magnetic wedge is applied is made with 4 poles of 2.2 kW.
An experiment was conducted using an electric motor, and the results are shown in Table 1. According to this example, it can be seen that the efficiency has improved by 1.5% from 81.0% to 82.5%. Also, the loss was reduced by about 50 W, and this was due to the reduction in harmonic loss in the gap between the stator and rotor.

[0015]

[Table 1]

Furthermore, as a result of winding a search coil around the wedge portion and investigating the frequency characteristics of the magnetic flux interlinking with the wedge portion, as shown in FIGS. 3 and 4, the magnetic wedge 4 of the present invention has a higher The flux linkage in the magnetic wedge is significant, especially in the frequency band below 1 kHz, which means a reduction in high frequency loss in the air gap. The composition of the amorphous sheet used in the present invention includes all iron-based, cobalt-based, nickel-based, etc. amorphous sheets.

Further, in the present invention, the magnetic wedge 4 is formed by adhering the amorphous sheet 4b to the uneven surface of the thin sheet material 4a formed by shot blasting or embossing, so that the two are firmly attached. It may be configured to be integrated. Furthermore, the surface of the amorphous sheet may be coated with an insulating material and then adhered to a thin sheet material. (Second example)

A second embodiment will be explained with reference to FIGS. 5 and 6. The magnetic wedge 9 of this embodiment is a first non-magnetic thin sheet material 4a made of the same material as described in the first embodiment.
An amorphous sheet 4b is adhered to the amorphous sheet 4b, and a second nonmagnetic thin material 4c made of the same material as the first nonmagnetic thin material 4a but slightly thinner is placed on the amorphous sheet 4b so as to cover the amorphous sheet 4b. They are glued together and become one. The magnetic wedge 9 thus formed is inserted into the slot 2 so that the thin second non-magnetic thin leaf material 4c is located on the opposite side from the coil 3, as shown in FIG.

According to the magnetic wedge 9 of this embodiment, the second non-magnetic thin material 4c can effectively prevent the amorphous sheet 4b from being peeled off during the automatic insertion process into the slot 2. Further, since the thickness of the first non-magnetic thin sheet material 4a in contact with the coil 3 can be increased by the thickness of the second non-magnetic thin sheet material 4a, the withstand voltage strength of the coil is improved. Note that it is not an essential condition that the second non-magnetic thin sheet material 4c be made thinner than the first one. (Third example)

A magnetic wedge 10 of the present invention shown in FIGS. 7 and 8 as a third embodiment has a longitudinal dimension (Longitudinal Length) of an amorphous sheet 4a.
is approximately equal to the longitudinal dimension L of the slot 2, and that of the non-magnetic thin sheet material 4b is set to an appropriate dimension d1 from both ends of the slot 2.
The dimensions are set so that it only protrudes. Such a magnetic wedge 1
According to No. 0, the insulation distance between both ends of the amorphous sheet 4b, which lacks electrical insulation, and the coil 3 becomes longer, and as a result, the sheet 4b is further prevented from damaging the coil 3, and the coil 3 is further prevented from being damaged. Improves voltage strength. (Fourth example)

The magnetic wedge 11 of the fourth embodiment shown in FIGS. 9 and 10 is different from the magnetic wedge 11 except that the non-magnetic thin material 4a is set to a size such that the non-magnetic thin material 4a protrudes from both side edges of the amorphous sheet 4b by an appropriate dimension d2. The magnetic wedge 10 of the third embodiment is the same as the magnetic wedge 10 of the third embodiment. (Fifth example)

The magnetic wedge 12 of the fifth embodiment shown in FIG.
In the magnetic wedge 9 of the second embodiment shown in FIG. 5, the first and second non-magnetic thin sheets 4a and 4c are set to a size such that they protrude by d1 and d2 from both ends and both side edges of the amorphous sheet 4b, respectively. Become. The magnetic wedges 11 and 12 of the fourth and fifth embodiments also provide the same effects as described in the third embodiment, and also have a magnetic wedge between the first and second thin sheets 4a and 4c protruding from the amorphous sheet 4b. A strong adhesive effect can be obtained. (6th example)

The magnetic wedge 13 of the sixth embodiment shown in FIGS. 12 and 13 has a slot 2 of the stator core 1 in its center.
A protrusion 13a, which is a U-shaped bent part, is formed which tightly fits into the opening 2a of the holder, and the other parts are the same as those shown in FIG. According to this embodiment, the protrusion 13a of the magnetic wedge 13 is positioned within the opening 2a of the slot 2 so as to be flush with the outer circumferential surface of the stator core 1, so that there is no space between the stator and the rotor. The magnetic flux distribution in the gap is made uniform. (Seventh Example)

The magnetic wedge 14 of the seventh embodiment shown in FIGS. 14 and 15 has a configuration in which an auxiliary amorphous thin piece 13b is inserted inside the top of a U-shaped projection 13a.
Since the cross-sectional area of the magnetic path 3a is increased, the magnetic characteristics of this portion with respect to harmonic magnetic flux are improved, and the transmission of harmonic components to the rotor side is alleviated. In this case, the auxiliary amorphous thin piece 13b may be bonded to the inner or outer surface of the projection 13a. (Eighth example)

The magnetic wedge 15 of the eighth embodiment shown in FIG. 16 is a modification of the one shown in FIG. They are laminated together to form a structure. The magnetic wedge 15 of this embodiment has the advantage that the magnetic permeability of the wedge can be easily adjusted over a wide range by selecting the magnetic permeability of the two amorphous sheets 16a and 16b. (9th example)

In the magnetic wedge 17 of the ninth embodiment shown in FIG. 17, the axial dimension L of the non-magnetic thin sheet material 4a is made approximately equal to that of the stator core 1, and the axial dimension of the amorphous sheet 18 is made equal to that of the stator core 1. It has a configuration that is about a fraction of the size of the previous model. (10th example)

The magnetic wedge 19 of the tenth embodiment shown in FIGS. 18 and 19 is made by bonding a non-magnetic thin material 4a and an amorphous sheet 4b, similar to the first embodiment. The slot 2 is characterized in that the size of both side portions of the slot 2 is approximately equal to the size of the opposite sides of the slot 2. According to the magnetic wedge 19 of this tenth embodiment,
Since most of the coil 3 within the slot 2 is covered with the amorphous sheet 4b, a surge absorption effect exhibiting high impedance against surge currents entering the coil 3 can be obtained. (11th example)

The magnetic wedge 20 of the eleventh embodiment shown in FIGS. 20 and 21 is made of a non-magnetic thin material 4a and an amorphous sheet 4.
b are polymerized to form a W-shaped cross section with a trough 20a in the center. This magnetic wedge 20 is shown in FIG.
It is arranged as shown in FIG. 2, and is firmly held within the slot 2 by the elastic restoring force at the valley portion 20a. (12th example)

The magnetic wedge 21 of the twelfth embodiment shown in FIGS. 22 and 23 is a non-magnetic thin sheet material 22 formed into a substantially U-shape.
and a rectangular amorphous thin piece 23 having approximately the same width as the inner edge-to-edge dimension of the opening 2a of the slot 2 of the stator core 1. These non-magnetic thin leaf materials 22 and amorphous thin pieces 2
3 are in a mutually separated state, and first only the nonmagnetic thin sheet material 22 is inserted into the slot 2, and then the amorphous thin sheet 23 is inserted so as to form the arrangement shown in FIG.

Both members 22 and 23 in this case
The gaps may be joined to each other by varnish insulation treatment after being inserted into the slot 2 in this way. Alternatively, an adhesive layer may be formed on both members 22 and 23 in advance, and when both members are superposed in the slot, they are bonded by heating in that state. In addition, in FIG. 23,
This magnetic wedge has a configuration in which a non-magnetic thin sheet material 22 and an amorphous thin piece 23 are bonded and integrated in advance in a polymerized state as shown in FIG. 22, and is substantially disclosed herein as a modification of the wedge shown in FIG. 1.

Next, in the wedge manufacturing method of the present invention, the bonding of the non-magnetic thin material and the amorphous sheet will be explained. In FIG. 24, an amorphous strip 4b', which is the material of the amorphous sheet 4b, and a plastic strip 4a', which is the material of the non-magnetic thin sheet material 4a, are coated with adhesive on one side in advance and are wound into a roll. It is equipped. And these two strips 4
a' and 4b' are unwound by the guide roller device 30 and polymerized so that their adhesive surfaces come into contact with each other, and the bonding between them is heated and bonded in the process of passing through the bonding device 31, and then the wedge strips are sequentially bonded. 32 and wound up into a roll. The wedge strip 32 wound into a roll is stored as it is, and when necessary, it is cut into an appropriate size while being rewound, and the cut piece is formed into a U-shape as shown in FIG. 1 to obtain a magnetic wedge 4. .

The apparatus disclosed in FIG. 25 (the same parts as in FIG. 24 are denoted by the same reference numerals) is used for manufacturing the magnetic wedge 9 shown in FIG. 5 as an example. FIG. 2 shows a second plastic strip 4c wound into a roll, which is the material of the second non-magnetic thin sheet material 4c shown in FIG.
In addition to the device No. 4, the guide roller device 30
The second plastic strips 4a' and 4c' are polymerized so that an amorphous strip 4b' is interposed between them to obtain a magnetic wedge strip 33.

The device disclosed in FIG. 26 (the same parts as in FIG. 24 are denoted by the same reference numerals) is the same as the device shown in FIG. adhesive strip 34;
is interposed by a guide roller device 30 between an amorphous strip 4b' and a plastic strip 4a' to which no adhesive is applied, respectively, and polymerized into three layers to obtain a magnetic wedge strip 32.

The apparatus shown in FIG.
, 4b' are wound in a roll without an adhesive layer provided in advance, and both strips 4a', 4
An adhesive applicator 35 is provided on at least one of the plastic strips b', for example, the passage portion of the plastic strip 4a', for applying an adhesive thereto during the passage thereof.

The apparatus shown in FIG. 28 is the same as the apparatus shown in FIG. 25, except that an adhesive applicator 35 is arranged at the portion through which the first and second plastic strips 4a' and 4c' pass. The device shown in FIG. 29 is the device shown in FIG.
A forming device 36 and a cutting device 37 are provided after the bonding device 31.
The magnetic wedge strip 32 sent out from the adhesive device 31 is sequentially formed into a U-shape as shown in FIG. The structure is such that a magnetic wedge 4 having a shape as shown in FIG. 1 is obtained by cutting. This figure 29
The configuration in which the forming device 36 and the cutting device 37 are disposed downstream of the bonding device 31 as shown in FIG. In this case, the forming device 36 and the cutting device 3
7 may be simply arranged in the opposite manner to the above.

FIG. 30 shows the molding apparatus 3 shown in FIG.
This forming device 36 consists of two forming rollers 38 and 39 that are heated by a heating device (not shown), and as shown in FIG. 31(a), one of the rollers 38 A female mold 38a is formed on the roller 39, and a male mold 39a is formed on the other roller 39. Therefore, the magnetic wedge strips 3 sequentially sent out from the adhesive device 31
2 is sent to the cutting device while being shaped into the curved state shown in FIG. 1 in the process of passing between heated forming rollers 38 and 39. In this case, the mold portions of the forming rollers 38 and 39 may have various shapes as shown in FIGS. 31(b) to 31(g).

FIGS. 32 to 34 show a non-magnetic thin sheet material 4a.
A configuration is disclosed in which the amorphous sheet 4b and the amorphous sheet 4b are integrated in a polymerized state by caulking rather than using an adhesive. The amorphous strip 4b' is provided with an engaging hole 40 (see FIG. 33) before being rolled into the rolled state shown in FIG.
are formed in an intermittent arrangement. Furthermore, a large number of protrusions 41 are intermittently formed in advance on the plastic strip 4a' at the same pitch as the engaging holes 40. In the process of these strips 4a' and 4b' passing through the guide roller device 30 disposed in the heating chamber 42, the protrusion 41 is penetrated into the engagement hole 40 and the tip of the protrusion 41 is heated. It is melted and engaged around the engagement hole 40 as shown in FIG. In this way, a magnetic wedge strip 43 is obtained in which the plastic strip 4a' and the amorphous strip 4b' are integrated in a polymerized state, and this is subsequently processed by the forming device 36 and cutting device 37 in the same manner as described above. A magnetic wedge 4 is obtained.

In the magnetic wedge manufacturing apparatus described so far, a strip-shaped amorphous material is bonded to a plastic strip, and as shown in FIG. A processing step may be performed in which amorphous sheets 4b cut to the same length L as the length in the magnetic wedge state are sequentially arranged and bonded at intervals of 2d1 in the longitudinal direction. This can be accomplished using a device similar to the widely known automatic strip labeling device. In this case, in order to obtain a position signal that determines the arrangement interval 2d1 of the amorphous sheet 4b with respect to the plastic strip 4a', signal holes 44 or small protrusions ( (not shown), or as shown in FIG.
5 may be formed intermittently.

FIGS. 38 and 39 show a bonding method between the thin material 4a and the amorphous sheet 4d, which is different from the method described above. That is, the magnetic wedge 47 shown in FIG. 38 is made by coating the outer surface of the amorphous sheet 4b and the exposed surface of the non-magnetic thin sheet material 4a from the amorphous sheet 4b with a plastic material liquid to form the coating layer 4.
6 (shown with diagonal lines for convenience). According to the magnetic wedge 47 having such a configuration, the amorphous sheet 4
Peeling of b can be effectively prevented.

A magnetic wedge 47 shown in FIG. 39 is formed by forming a coating layer 46 similar to that described above over the non-magnetic thin sheet material 4a on a portion of the periphery of the amorphous sheet 4b, which is the end to be inserted into the slot. . Such a coating layer 46
The formation of the portions may be performed only on both side edge portions of the amorphous sheet 4b.

In FIGS. 40 and 41 showing still another method of manufacturing the magnetic wedge of the present invention, an amorphous strip 4b' wound into a roll is unwound by guide rollers 49 and 50 while being coated with an insulating material such as polyester, epoxy or varnish. The plastic material solution is passed through a liquid tank 48 containing a plastic material solution, and then wound up into a roll as a wedge strip 51 while passing through a drying means 53 (not shown in detail).

As a result, as shown in FIG. 41, the insulating plastic material liquid is adhered to the surface of the amorphous strip 4b' as it passes through the liquid tank 48, and is dried by the drying means 51, thereby becoming magnetic. An insulating coating layer 52 corresponding to the non-magnetic thin sheet material 4a of the wedge 4 is formed. A magnetic wedge is obtained by cutting this wedge strip 51 into a curved shape and cutting it into an appropriate size.

As a method different from the above, an amorphous sheet bonded to the thin material may be obtained by forming an amorphous material directly on the surface of the thin material by plating or sputtering. (13th example)

As shown in FIG. 42, an amorphous thin strip 4b is adhered to the top of a U-shaped non-magnetic thin wedge 4a, and a magnetic permeability μ smaller than that of the thin strip 4b is attached to both sides of the wedge 4a. A magnetic wedge 50 for the slot is formed by gluing the pieces together. Thin strips 4b and 4b1 are placed at the top and side bends of the wedge 4a.
Since there are no cracks, it prevents cracking and chipping of the amorphous material. be able to. Furthermore, since the magnetic permeability .mu. of both thin ribbons 4b and 4b1 can be changed, the magnetic permeability of only the slot opening of the air gap can be changed in various ways depending on the motor design details. Figure 43 shows thin strips 4b and 4b1 for wedge 4a.
are short examples. Fig. 44 shows thin strips 4b and 4b1 as wedges.
The sandwich structure with adhesive on both sides is shown in a. (14th example)

As shown in FIG. 45, a plurality of divided amorphous thin strips 4b are adhered to the longitudinal surface of a U-shaped non-magnetic thin wedge 4a. With this structure, thin strip 4
b is difficult to peel off. Additionally, it can be cut into any desired wedge shape as a sheet material. Furthermore, ribbons of different magnetic permeability (e.g. wedge 4
A material with high magnetic permeability μ is bonded to the central portion in the length direction of a to meet the requirements of the motor characteristics. Near both ends in the length direction, the magnetic permeability μ is lowered, or vice versa. Figure 4
6 is one in which the thin strip 4b is shorter than the wedge 4a. (15th example)

As shown in FIG. 47, an amorphous thin strip 4b is adhered to the surface of a U-shaped wedge 4a of nonmagnetic thin material, and a conductive layer 4d of copper, aluminum, etc. is further plated or coated on the surface. Glue and slot magnetic wedge 5
form 5. The effect of this is that when used as a magnetic wedge in a motor, the thin ribbon 4b acts as a magnetic wedge that passes harmonic magnetic flux, improving efficiency, and the conductive layer 4d
The excess harmonic magnetic flux is consumed as eddy current, which is effective in reducing noise when driving an inverter that contains more harmonics. In FIG. 48, the surface of the conductive layer 4d in FIG. 47 is further covered with a nonmagnetic thin sheet material 4c. (16th example)

As shown in FIG. 49, a sandwich structure is formed in which both sides of an amorphous ribbon 4b are folded and wrapped with non-magnetic thin sheets. According to this, it is possible to fix the ribbon 4b with a single sheet of non-magnetic thin sheet material, and it is also possible to prevent the amorphous from peeling off when the slot magnetic wedge 57 is inserted into the slot. FIG. 50 shows an example in which the ribbon 4b is shorter by a dimension d1 than the non-magnetic thin sheet material shown in FIG. Figure 51 shows wedge 4
This is an example in which both end faces in the length direction of a are folded back. FIG. 52 is a diagram of the folded state of the non-magnetic thin sheet material of FIG. 51. Figure 53
This is an example in which the non-magnetic thin sheet material is folded back only at one end in the length direction of the wedge 4a. FIG. 54 shows an example of folding back the non-magnetic thin material at both ends of the wedge 4a in the width direction. Figure 55 is Figure 54
This is an example in which the folded end of the wedge 4a is extended to the top of the wedge 4a and the boundary between both sides. Furthermore, in each of FIGS. 53 to 55, the ribbon 4b is shorter than the non-magnetic thin sheet material. Note that the above-mentioned non-magnetic thin sheets may be bonded using an adhesive, or may be formed by fixing the non-magnetic thin sheets to each other by heating. (17th example)

As shown in FIG. 56, the perpendicular magnetic permeability μ of the wedge of the amorphous thin strip 4b attached to the top of the U-shaped non-magnetic thin wedge 4a and the longitudinal magnetic permeability μ′ of the wedge are expressed as μ ＞
This is an example of μ′. (18th example)

As shown in FIG. 57, the end plate 65 and the wedge portion 66
This is an example of an integral wedge 64 that has an integral comb shape. Since the wedges 4a can be inserted into the slots all at once, the working time is shortened. The state of adhesion between the wedge 4a and the ribbon 4b is as shown in FIG. FIG. 59 is a divided form of FIG. 57.

FIG. 60 shows the inserted state of the slot magnetic wedge 4 and the groove-shaped insulator 18. Since the groove-shaped insulator 18 is inside the slot magnetic wedge 4, the magnet wire 3 is insulated. is protected, and the thin strip 4b is the wedge 4a.
extends to both ends. Further, FIG. 61 shows a state in which the groove-shaped insulators 18 in FIG. 60 are overlapped on the slot opening side. Figure 62 shows a groove-shaped insulator 18 on the outside of the slot magnetic wedge 4.
Therefore, from the viewpoint of magnet wire insulation, the thin ribbon 4b is stopped at a place where it touches the tip of the groove-shaped insulator 18.

[0051]

Effects of the Invention In the present invention, a film of several micrometers to several tens of micrometers in thickness is applied to the center of the surface of a non-magnetic thin material such as a polyester film or aromatic aramid paper, with a length approximately the same as the stator core dimension.
By adhering amorphous thin strips of about 100 mL, it is possible to provide an inexpensive magnetic wedge material in which both are in close contact with each other.

[0052] Therefore, since the non-magnetic thin material such as polyester film or aromatic aramid paper and the amorphous thin strip are in the form of an integrated sheet, it is difficult to insert the magnetic wedge into the stator slot using the conventional automatic method. You can use an inserter. And, without reducing the amount of coils in the slot of the motor stator by inserting a magnetic wedge,
It can exhibit the effect of improving the characteristics of magnetic wedges. Additionally, the thinner non-magnetic thin sheet material has an added effect of preventing the amorphous ribbon from being peeled off or damaged during automatic insertion.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a magnetic wedge showing a first embodiment of the present invention;

[
FIG. 2 is a partial cross-sectional view of the stator core showing how the magnetic wedge is inserted into the slot;

[Figure 3] Measurement diagram showing the amount of magnetic flux linkage in a non-magnetic wedge,

[
FIG. 4 is a measurement diagram showing the amount of interlinkage magnetic flux in the magnetic wedge of the present invention,

FIG. 5 is a perspective view of a magnetic wedge showing a second embodiment of the present invention;

[
FIG. 6 is a partial cross section of the stator core showing how the magnetic wedge of the second embodiment is inserted into the slot;

FIG. 7 is a perspective view of a magnetic wedge in a third embodiment;

[Figure 8]
A plan view of the third embodiment shown flatly developed;

[Figure 9] Fourth
A view corresponding to FIG. 7 showing the magnetic wedge of the example,

FIG. 10 is a diagram corresponding to FIG. 8 showing the magnetic wedge of the fourth embodiment;

FIG. 11 is a diagram corresponding to FIG. 7 showing the magnetic wedge of the fifth embodiment;

FIG. 12 is a diagram corresponding to FIG. 1 showing the sixth embodiment;

FIG. 13 is a diagram corresponding to FIG. 2 showing the sixth embodiment;

FIG. 14 is a diagram corresponding to FIG. 1 showing the seventh embodiment;

FIG. 15 is a diagram corresponding to FIG. 2 showing the seventh embodiment;

FIG. 16 is a diagram corresponding to FIG. 11 showing the eighth embodiment;

FIG. 17 is a diagram corresponding to FIG. 1 showing the ninth embodiment;

FIG. 18 is a diagram corresponding to FIG. 1 showing the tenth embodiment;

[Figure 1
9] A diagram corresponding to FIG. 2 showing the tenth embodiment,

[Figure 20] No. 11
A diagram equivalent to FIG. 1 showing an embodiment,

FIG. 21 is a diagram corresponding to FIG. 2 showing the eleventh embodiment;

FIG. 22 is an exploded perspective view of a magnetic wedge showing a twelfth embodiment;

FIG. 23 is a longitudinal sectional view showing how the magnetic wedge shown in FIG. 22 is arranged in the slot;

FIG. 24: Diagram of magnetic wedge manufacturing device,

FIG. 25: Diagram of magnetic wedge manufacturing apparatus,

FIG. 26: Diagram of magnetic wedge manufacturing apparatus,

FIG. 27: Diagram of a magnetic wedge manufacturing apparatus,

FIG. 28: Diagram of magnetic wedge manufacturing apparatus,

FIG. 29: Diagram of magnetic wedge manufacturing apparatus,

FIG. 30: Diagram of magnetic wedge manufacturing apparatus,

31] Diagrams showing different shapes of the forming roller shown in FIG. 30,

[Fig. 32] Perspective view of wedge strips connected by caulking structure

FIG. 33 is a longitudinal cross-sectional view of a wedge strip joined by a caulking structure;

FIG. 34 is a diagram of an inter-strip joining device for obtaining the wedge strip shown in FIG. 32;

FIG. 35 is a perspective view showing further different wedge strips;

FIG. 36 is a perspective view showing the plastic strip with the position signal generator of FIG. 35;

FIG. 37 is a perspective view showing the plastic strip with the position signal generator of FIG. 35;

FIG. 38 is a perspective view showing different configurations of the magnetic wedge of the 13th embodiment;

FIG. 39 is a perspective view showing different configurations of the magnetic wedge of the 13th embodiment;

FIG. 40 is a diagram showing a method for manufacturing a magnetic wedge with a further different structure;

FIG. 41 is a longitudinal sectional view showing a wedge strip manufactured by the apparatus shown in FIG. 40;

FIG. 42 is a diagram corresponding to FIG. 1 showing the 13th embodiment;

[Figure 43]
A diagram corresponding to FIG. 1 showing another example of the thirteenth example,

FIG. 44 is a diagram corresponding to FIG. 1 showing another embodiment of the 13th embodiment;

FIG. 45 is a diagram corresponding to FIG. 1 showing the 14th embodiment;

[Figure 46]
A diagram corresponding to FIG. 1 showing another example of the fourteenth example,

FIG. 47 is a diagram corresponding to FIG. 1 showing the 15th embodiment;

[Figure 48]
A diagram corresponding to FIG. 1 showing another embodiment of the 15th embodiment,

FIG. 49 is a diagram corresponding to FIG. 1 showing the 16th embodiment;

[Figure 50]
A diagram corresponding to FIG. 1 showing another example of the 16th example,

FIG. 51 is a diagram corresponding to FIG. 1 showing another embodiment of the 16th embodiment;

FIG. 52 is a folding state diagram of FIG. 51;

FIG. 53 is a diagram corresponding to FIG. 1 showing another embodiment of the 16th embodiment;

FIG. 54 is a diagram corresponding to FIG. 1 showing another embodiment of the 16th embodiment;

FIG. 55 is a diagram corresponding to FIG. 1 showing another embodiment of the 16th embodiment;

FIG. 56 is a diagram corresponding to FIG. 1 showing the 17th embodiment;

[Figure 57]
A diagram corresponding to FIG. 1 showing the 18th embodiment,

FIG. 58 is a side view of FIG. 57;

FIG. 59 is a diagram corresponding to FIG. 1 showing another embodiment of the 18th embodiment;

[Fig. 60] A view corresponding to Fig. 2 with groove-shaped insulator inserted;

[Figure 61
】Equivalent view of Figure 2 with groove-shaped insulator inserted,

FIG. 62 is a view corresponding to FIG. 2 in which a groove-shaped insulator is inserted.

[Explanation of symbols]

1: Stator core, 2: Slot,
3: Coil, 4, 9, 10,: Magnetic wedge,
4a, 4c, 22: Non-magnetic thin leaf material, 4b: Amorphous sheet ribbon.

Claims (12)

[Claims] Claim 1: A magnetic wedge for a slot consisting of a non-magnetic thin sheet material and an amorphous sheet adhered to the surface of the thin sheet material opposite to the surface facing the coil when inserted into the slot, is used in a rotating electric machine. A magnetic wedge for a slot of a rotating electrical machine, characterized in that it is inserted into a stator core to close the opening of the slot to prevent a coil from escaping within the slot. 2. A first non-magnetic thin sheet material, an amorphous sheet adhered to the surface of the first thin sheet material opposite to the surface facing the coil when inserted into the slot, and a surface of the amorphous sheet adhered to the surface opposite to the surface facing the coil side when the first thin sheet material is inserted into the slot. A slot magnetic wedge consisting of a second non-magnetic thin sheet material placed in and bonded thereto is inserted into a slot of a stator core of a rotating electric machine to close the opening of the slot and prevent the coil from escaping within the slot. A magnetic wedge for slots in rotating electric machines featuring: 3. The magnetic wedge for a slot of a rotating electric machine according to claim 1, wherein the amorphous sheet has a dimension substantially equal to the longitudinal dimension of the slot. 4. The magnetic material for a slot of a rotating electric machine according to claim 1, wherein at least one of the longitudinal dimension of the nonmagnetic thin sheet material and the dimension in a direction perpendicular to the longitudinal direction of the slot is longer than that of the amorphous sheet. wedge. 5. At least one of the longitudinal dimension of the slot and the dimension perpendicular thereto of the first and second non-magnetic thin sheets is longer than that of the amorphous sheet. Magnetic wedge for slots in rotating electric machines. 6. The magnetic wedge for a slot of a rotating electrical machine according to claim 1, wherein the magnetic wedge has a bent protrusion that protrudes from inside the slot into an opening of the slot and fits into the opening. 7. The magnetic wedge for a slot in a rotating electric machine according to claim 1, wherein the amorphous sheet is formed by polymerizing at least two amorphous sheets having different magnetic permeabilities. 8. The magnetic wedge for a slot of a rotating electric machine according to claim 1, wherein the amorphous sheet is sized to cover most of the area on both sides of the slot so as to provide a surge absorption effect. 9. A non-magnetic thin sheet material inserted into the slot, an amorphous sheet arranged so as to overlap the surface of the thin sheet material opposite to the surface facing the coil when inserted into the slot, and A slot magnetic wedge consisting of a coating layer made of a non-magnetic material formed between the exposed surfaces of an amorphous sheet and a magnetic thin sheet is used in a slot of a stator core of a rotating electrical machine. A magnetic wedge for a slot of a rotating electric machine, characterized in that it is inserted to close an opening and prevent a coil from escaping within the slot. 10. A slotted magnetic wedge made of an amorphous sheet and a non-magnetic insulating layer formed to a predetermined thickness by coating on the surface of this sheet, whose opening is closed with a slot of a stator core of a rotating electric machine. A magnetic wedge for a slot of a rotating electrical machine, characterized in that it is inserted to prevent a coil from escaping within the slot. 11. Consisting of a non-magnetic thin sheet material and an amorphous sheet polymerized on the surface opposite to the surface facing the coil when the thin sheet material is inserted into the slot, one of the thin sheet material and the amorphous sheet A slotted magnetic wedge, in which a protrusion that engages with the other member is formed so as to integrally connect the two members in a superposed state, is inserted into the slot by closing the opening with a slot in the stator core of a rotating electric machine. A magnetic wedge for a slot in a rotating electric machine, characterized in that the wedge is inserted to prevent a coil from escaping. 12. A magnetic wedge for a slot, which is inserted into a slot in a stator core of a rotating electric machine so as to close the opening of the slot to prevent a coil from escaping within the slot, is a non-magnetic thin leaf inserted into the slot. A magnetic wedge for a slot, which is made of a thin sheet material and an amorphous thin piece inserted into the slot so that it overlaps the surface opposite to the side facing the coil when inserted into the slot, is used to attach the magnetic wedge to the stator of a rotating electric machine. A magnetic wedge for a slot of a rotating electric machine, characterized in that the slot of an iron core is inserted to close the opening of the slot to prevent a coil from escaping within the slot.