JPH05276706A - Magnetic wedge for slot of rotating machine - Google Patents

Abstract

PURPOSE:To improve the flow of the magnetic flux of a fundamental wave and concurrently reduce the losses generated by the magnetic fluxes of higher harmonics and in its turn improve the characteristic of a rotating machine, by constituting a magnetic wedge for a slot through bonding an amorphous thin band to the surface of the magnetic wedge or through burying the amorphous thin band in the magnetic wedge. CONSTITUTION:By compressing an iron powder or ferrite, or by molding it with a resin, a magnetic wedge 3 of five microns to several tens of microns in its relative permeability is obtained. By providing an amorphous thin band 4 of about several micrometers to several tens of micrometers in its film thickness on the surface of the magnetic wedge 3, a composite magnetic wedge 5 is obtained. For example, the amorphous thin band 4 is an alloy band made of 75% first material and 25% second material. The first material is made of 88% Co, 6% Fe, 4% Ni, and 2% Nb. The second material is made of 40% Si and 60% B. Further, the composite magnetic wedge 5 is so stored in a slot 2 of a stator core 1 as to block up an opening part 2a of the slot 2. Thereby the flow of the magnetic flux of a fundamental wave is improved by the magnetic wedge 3, and concurrently, various losses generated by the magnetic fluxes of higher harmonics can be reduced by the amorphous thin band 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor having a slot structure such as an open slot type or a semi-closed type,
The present invention relates to a magnetic wedge for a slot of a rotary electric machine for closing an opening of a slot in which a winding is arranged and improving characteristics in the rotary electric machine such as a generator.

[0002]

2. Description of the Related Art A magnetic wedge is generally inserted into a slot opening of a motor stator for the purpose of improving the efficiency and power factor of a motor or reducing electromagnetic vibration noise. By inserting this magnetic wedge, the magnetic imbalance between the slot opening of the stator core and the teeth of the core is corrected, the magnetic flux distortion of the air gap between the rotor and the stator is eliminated, and the The characteristics are improved.

The conventional magnetic wedge has a large thickness because it is made of a material obtained by compressing iron powder or resin molding, and in order to suppress passage (leakage) of the fundamental magnetic flux between the slot teeth, iron powder, ferrite, etc. The relative magnetic permeability was set to a low value of about 5 to several tens by adjusting the content ratio of the magnetic material.
Then, by improving the flow of the fundamental wave magnetic flux, the magnetic flux is made uniform in the air gap to improve the characteristics.

Therefore, although the conventional magnetic wedge having a large thickness alone has an effect of improving the magnetic flux of the fundamental wave, since the relative magnetic permeability is low, the harmonic magnetic flux often generated in the stator and the rotor is generated between the tooth portions of the slots. These harmonic magnetic fluxes did not pass through the core and passed through the iron core to cause core loss and copper loss due to interlinkage with the coil, resulting in an insufficient characteristic improvement effect.

Therefore, for the purpose of eliminating such defects, JP-A-58-19138 and JP-A-58-58 are used.
No. 22554 and JP-A-59-175350, a magnetic wedge using an amorphous alloy is introduced. In the magnetic wedges disclosed in these documents, amorphous sheets are laminated so as to have a substantially trapezoidal cross section, and the laminated sheets are bonded with an adhesive. Alternatively, a synthetic resin layer mixed with magnetic powder is interposed between the laminated sheets to integrate them. However, in Japanese Patent Laid-Open No. 58-19138, since amorphous sheets are laminated substantially parallel to the center line direction of the iron core cross section, it is difficult for the harmonic magnetic flux to pass between the slot teeth and the loss caused by the harmonic magnetic flux. There was no reduction effect.

Further, in JP-A-58-22554 and JP-A-59-175350, since the amorphous ribbon is laminated between the slot tooth portions of the iron core, not only the harmonic magnetic flux but also the basic torque contributing to the torque. Wave magnetic flux passes (leaks)
However, the torque is reduced. Further, a magnetic wedge formed by molding an amorphous magnetic fiber into a predetermined shape with an organic binder is also introduced.

[0007]

However, the laminated magnetic wedges introduced therein require various types of amorphous sheets having different width dimensions, and it is necessary to bond a number of laminated layers. Therefore, many steps are required for manufacturing, and it is difficult to secure the strength required for the magnetic wedge by the adhesive strength. Further, the interposition of an adhesive or a synthetic resin layer between a large number of laminated layers or the integral molding of magnetic fibers with an organic binder causes an increase in the volume of the wedge, which causes a problem that the characteristics of the motor are deteriorated and the motor is enlarged. ..

Further, it is difficult to pass the harmonic magnetic flux between the slot tooth portions of the iron core, and these harmonic magnetic flux passes through the iron core to cause iron loss and coil loss to cause copper loss. There was a problem of letting it.

Further, the harmonic magnetic flux can pass between the slot tooth portions of the iron core, but at the same time, a large amount of the fundamental wave magnetic flux also passes, so that there is a problem that torque is reduced. The present invention aims to solve such a drawback, and improves the characteristics of a rotary electric machine by improving the flow of the fundamental wave magnetic flux, which is the characteristic of the conventional magnetic wedge, and reducing the loss generated by the harmonic magnetic flux. A magnetic wedge for a slot is provided.

[0010]

According to the present invention, a first
In a magnetic wedge for a slot of a rotary electric machine, which closes the slot opening of a rotary electric machine provided with an iron core having a slot structure such as an open slot type or a semi-closed type,
Amorphous ribbon is adhered to the surface of this magnetic wedge,
It is possible to provide an improved magnetic wedge for a slot of a rotating electric machine.
Second, the amorphous ribbon can provide a magnetic wedge for an improved rotating electrical machine slot embedded in the magnetic wedge.

[0011]

In the present invention, the content ratio of iron powder is adjusted and the relative permeability is set to a low value of about 5 to several tens in order to suppress passage (leakage) of the fundamental wave magnetic flux between the slot tooth portions as much as possible. By improving the flow of the fundamental wave magnetic flux, the magnetic flux is made uniform in the air gap, and the characteristics of the magnetic wedge such as iron powder and ferrite are compressed or resin-molded on the surface of the magnetic wedge. By adhering an amorphous ribbon having a film thickness of about several μm to several tens of μm, it is possible to provide a rotary electric machine that can be made into a composite magnetic wedge and whose characteristics can be improved.

Therefore, in the ordinary magnetic wedge, the flow of the fundamental wave magnetic flux is improved, the magnetic imbalance between the slot opening of the stator core and the teeth of the core is corrected, and the air between the rotor and the stator is corrected. Magnetic flux distortion in the gap is eliminated, and various characteristics of the electric motor are improved.

Further, by passing the harmonic magnetic fluxes, which are frequently generated in the stator and the rotor, between the slot teeth, these harmonic magnetic fluxes pass through the iron core and are interlinked with the iron loss and the coil. It is possible to reduce the occurrence of copper loss and to exhibit the characteristic improving effect.

The amorphous ribbon adhered to the surface of the magnetic wedge generally has a lower saturation magnetic flux density than the magnetic material used for the iron core and has a film thickness of about several μm to several tens of μm. Passage (leakage) between the teeth can be suppressed, and deterioration in torque characteristics can be suppressed to a minimum. Furthermore, since the amorphous ribbon has a high relative magnetic permeability at high frequencies, it is possible to allow higher harmonic magnetic flux to pass through this amorphous ribbon, reducing iron loss and copper loss generated by the harmonic magnetic flux, and improving the characteristics. It is possible to provide a composite magnetic wedge that can exert the effect.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS.
Will be described.

In FIG. 1, iron powder and ferrite are compressed,
Alternatively, an amorphous ribbon or a sheet or tape 4 having a film thickness of several .mu.m to several tens of .mu.m is formed on the surface of the magnetic wedge 3 which is molded by resin and has a relative magnetic permeability of about 5 to several tens. A thin ribbon) is arranged as a composite magnetic wedge 5. The amorphous ribbon of this embodiment uses an alloy composed of 75% of a first substance composed of 88% Co, 6% of Fe, 4% of Ni and 2% of Nb and 25% of a second substance composed of 40% of Si and 60% of B. In FIG. 2, the composite magnetic wedge 5 is housed so as to close the opening 2a of the slot 2 having the semi-closed slot structure of the stator core 1.

Since the present invention is constructed as described above,
As the composite magnetic wedge 5, the conventional magnetic wedge 3 improves the flow of the fundamental magnetic flux, and the amorphous thin ribbon 4 reduces various losses caused by the harmonic magnetic flux.

Furthermore, the film thickness of the amorphous ribbon is from several μm to
Since it is about several tens of μm, even if it is adhered to the conventional magnetic wedge, the deterioration of the characteristics due to the imbalance of the air gap can be ignored, and there is no danger of hitting the gap with the rotor. Further, it is possible to obtain the optimum magnetic material and film thickness for each electric motor.

Further, as shown in FIGS. 3, 4, and 6, the position of the amorphous ribbon 4 adhered to the magnetic wedge 3 is not limited to the head as shown in FIG. 1, but only the bottom, the head and both ends. It may be adhered to the part or the entire circumference. (Second embodiment)

The second embodiment will be described with reference to FIG. The amorphous ribbon 4 of this embodiment is embedded in the magnetic wedges 3a and 3b to form an integrally molded composite magnetic wedge 8. According to this embodiment, since the amorphous ribbon 4 is located in the composite magnetic wedge 8, it is possible to prevent the amorphous ribbon 4 from peeling when the wedge is inserted into the slot. (Third embodiment)

A third embodiment will be described with reference to FIGS. 7 and 8. In this embodiment, an amorphous ribbon 4 having a film thickness of several μm to several tens of μm is formed on the surface of a magnetic wedge 3 having a relative magnetic permeability of about 5 to several tens compressed by compressing iron powder or ferrite or resin molding. Are arranged, which will be referred to as a composite magnetic wedge 10. In FIG. 8, the composite magnetic wedge 10 is housed so as to close the opening of the slot 2 having the open slot structure of the stator core 1. According to this embodiment, the same effect as in the first embodiment can be obtained even in the open slot.

As shown in FIGS. 9, 10, and 6, the position of the amorphous ribbon 4 bonded to the magnetic wedge 3 is not limited to the head as shown in FIG. It may be adhered to a part or the like. (Fourth embodiment)

A fourth embodiment will be described with reference to FIG. The amorphous ribbon 4 of this embodiment is embedded in the magnetic wedges 3a and 3b to form an integrally molded composite magnetic wedge 13. According to this embodiment, since the amorphous ribbon 4 is located in the composite magnetic wedge 13, it is possible to prevent the amorphous ribbon from peeling when the wedge is inserted into the slot.

As a method for manufacturing the magnetic wedge in the present invention, as an adhesive method for the amorphous ribbon, an epoxy-based or urethane-based adhesive is used, or a tape having adhesive on both sides (double-sided tape). The present invention is not limited to those using, but is also included in the present invention including those that are bonded by any method.

[0025]

According to the present invention, the content ratio of the iron powder is adjusted to suppress the passage (leakage) of the fundamental magnetic flux between the slot tooth portions as much as possible, and the relative permeability is set to a low value of about 5 to several tens. By improving the flow of the magnetic flux of the fundamental wave, the magnetic flux is made uniform in the air gap, and it is made of a material obtained by compressing or resin-molding a magnetic material such as iron powder or ferrite whose characteristics have been improved. The film thickness is several μm to several on the surface of the magnetic wedge.
By bonding an amorphous ribbon of about 10 μm,
It is possible to provide a rotating electric machine that can be used as a composite magnetic wedge to improve its characteristics.

Therefore, in the conventional magnetic wedge, the flow of the fundamental wave magnetic flux is improved, the magnetic imbalance between the slot opening of the stator core and the teeth of the core is corrected, and the air between the rotor and the stator is corrected. Magnetic flux distortion in the gap is eliminated, and various characteristics of the electric motor are improved.

Further, by passing the harmonic magnetic fluxes, which are often generated in the stator and the rotor, between the slot teeth, these harmonic magnetic fluxes pass through the inside of the iron core and are interlinked with the iron loss and the coil. It is possible to reduce the occurrence of loss and to exhibit the characteristic improving effect.

The amorphous ribbon adhered to the surface of the magnetic wedge has a saturation magnetic flux density lower than that of the magnetic material generally used for the iron core and has a film thickness of several μm to several tens of μm. Passage (leakage) between the iron core teeth can be suppressed, and deterioration of torque characteristics can be suppressed to a minimum. Furthermore, since the amorphous ribbon has a high relative magnetic permeability at high frequencies, it is possible to allow higher harmonic magnetic flux to pass through this amorphous ribbon, reducing iron loss and copper loss generated by the harmonic magnetic flux, and improving the characteristics. It is possible to provide a composite magnetic wedge that can exert the effect.

[Brief description 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 of the first embodiment.

FIG. 3 is a view corresponding to FIG. 2 of a modified example of the first embodiment.

FIG. 4 is a view corresponding to FIG. 2 of a modified example of the first embodiment.

FIG. 5 is a view of the second embodiment corresponding to FIG.

FIG. 6 is a view corresponding to FIG. 2 of a modified example of the first embodiment.

FIG. 7 is a view of the third embodiment corresponding to FIG.

FIG. 8 is a view of the third embodiment corresponding to FIG.

FIG. 9 is a view of a modification of the third embodiment, corresponding to FIG.

FIG. 10 is a view corresponding to FIG. 2 of a modified example of the third embodiment.

FIG. 11 is a view corresponding to FIG. 2 of the fourth embodiment.

[Explanation of symbols]

1 ... Stator core, 2 ... Slot, 2a ... Opening,
3, 3a, 3b ... magnetic wedge, 4 ... amorphous ribbon,
5,6,7,8,9,10,11,12,13 ... Composite magnetic wedge.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Takao Sawa Inventor Takao Sawa 8 Shinsita-cho, Isogo-ku, Yokohama-shi Kanagawa Co., Ltd. Inside Toshiba Yokohama Works (72) Inventor Yasushi Sakata 8 Shinsita-cho, Isogo-ku, Yokohama-shi Kanagawa Company Toshiba Yokohama Works (72) Inventor Tadatomo Kimura 2121 Samurai, Asahi-cho, Mie-gun, Mie Co., Ltd.Incorporated Toshiba Mie Factory (72) Inventor Shigeo Ozawa 2121 Sayo, Asahi-cho, Mie-gun, Mie Company Toshiba Mie factory

Claims (2)

[Claims] 1. A magnetic wedge for a slot of a rotary electric machine for closing the slot opening of a rotary electric machine provided with an iron core having a slot structure such as an open slot type or a semi-closed type, and an amorphous ribbon on the surface of the magnetic wedge. A magnetic wedge for a slot of a rotary electric machine, characterized by being bonded to form a composite magnetic wedge. 2. The magnetic wedge for a slot of a rotary electric machine according to claim 1, wherein the amorphous ribbon is a composite magnetic wedge embedded in a magnetic wedge.