JPH04347551A - Slot insulating magnetic wedge - Google Patents

Abstract

PURPOSE:To provide a magnetic wedge which is cheap and the most suitable for various electric motors, with improved characteristics. CONSTITUTION:An amorphous whin band 4b of a length almost equal to the stator iron core size and about several mum to several tens of mum film in thickness is stuck to a surface central part of a non-magnetic thin sheet material 4a of polyester film, aramid paper, etc., so as to form a cheap magnetic wedge material of a lamination of both the material 4a and the band 4b. Since these materials are thus formed into a sheet, a conventional automatic inserting machine can be used in order to insert a magnetic wedge into a stator slot, and without decreasing a coil amount in the slot of an electric motor stator due to inserting the magnetic wedge, the characteristic improving effect of the magnetic wedge can be displayed. The thinner non-magnetic thin sheet material, at the time of automatic insertion, prevents the amorphous thin band from being separated or damaged.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a wedge that is housed in a stator slot of an electric motor.

0002

2. Description of the Related Art For the purpose of improving the efficiency and power factor of a motor or reducing electromagnetic vibration noise, it is common practice to insert a magnetic wedge into a slot opening of a motor stator. By inserting a magnetic wedge, the magnetic imbalance between the stator slot opening of the motor and the stator teeth is corrected, magnetic flux distortion in the motor air gap is reduced, and various characteristics of the motor are improved. be.

FIG. 7 shows a partial configuration diagram of a stator slot of an electric motor using a conventional general magnetic wedge. In FIG. 7, the magnetic wedge 4 housed in the slot 2 of the motor stator 1 also serves to prevent the coil 3 from flying out. Generally, the characteristics of an electric motor are usually improved in proportion to the amount of coils 3 housed in the slots 2. Therefore, the conventional magnetic wedge 4 shown in FIG. 7 has the drawback that the effective cross-sectional area of the slot 2 is lost, and as a result, the effect of inserting the magnetic wedge 4 is no longer exhibited. Therefore, in order to eliminate such drawbacks, in Utility Model Application No. 59-18548, a magnetic material 4 was added to a thin sheet material 4a used as a wedge material in an electric motor, as shown in FIGS. 8 and 9.
The magnetic wedge 4 is formed by coating and integrating ferrite (b). By using this magnetic wedge 4, the amount of coils that can be stored in the slot 2 is not only almost the same as conventional wedges made of non-magnetic thin material, but also the effect of the magnetic wedge is exhibited and the wedge can be inserted automatically. Methods have been proposed that are expected to have the following effects.

0004

[Problem to be solved by the invention] This conventional technique
In the method of -18548, the thin sheet material 4a used for the magnetic wedge 4 is coated with ferrite, which is the magnetic material 4b, and integrated, but coating with ferrite requires large-scale, automated and expensive equipment. What you need. Furthermore, there was a problem that if the magnetic material 4b was coated too thick, it would peel off. Furthermore, because the coating surface is arranged on the coil storage side of the stator slot, the voltage resistance characteristics of the coil are reduced. Furthermore, there was a drawback that the coil was easily damaged.

The purpose of the present invention is to eliminate such drawbacks, and to manufacture a magnetic wedge optimal for various electric motors at low cost, without reducing the withstand voltage characteristics and without damaging the coil. Automatically inserts a magnetic wedge. It is also an attempt to exhibit the effect of improving the characteristics of the magnetic wedge without reducing the amount of coils in the slots of the motor stator. [Structure of the invention]

[0006]

[Means for Solving the Problems] The present invention provides a slot insulating magnetic wedge that is inserted so as to be in contact with the inner surface of a stator slot of an electric motor and to have an opening near the center thereof. A film with a thickness of several μm to several tens of μm is applied to the center of the surface of a magnetic thin material such as paper,
This invention relates to a slot insulating magnetic wedge for an electric motor that is automatically inserted into the slot by gluing an amorphous thin strip with approximately the same length as the stator core dimension. According to a second aspect of the present invention, a slot insulating magnetic wedge for an electric motor is formed by bonding an amorphous thin strip and then a non-magnetic thin sheet material thinner than the previous one, and the wedge is automatically inserted into the slot.

[0007]

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

[0008] 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. Also, claim 2
This adds the effect of preventing the amorphous ribbon from being peeled off or damaged when the thinner non-magnetic thin sheet material is automatically inserted.

[0009]

Embodiment A first embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, 4a is a non-magnetic thin material such as polyester film or aromatic aramid paper, which is generally used as a wedge material in electric motors, and has a film thickness of several μm to several tens of μm. The amorphous ribbons are bonded together to form a magnetic wedge 4. Here, the stator core length is L, and an amorphous thin strip 4b having approximately the same length as the stator core length L is glued to the center of the non-magnetic thin sheet material 4a, and both end portions, that is, the stator core The amorphous ribbon 4b is not bonded to the outer portion d. As shown in FIG. 2, the coil 3 in the slot 2 of the stator 1 is inserted so as to prevent it from flying out from the opening, and the amorphous thin strip 4b is configured to be on the opposite side of the coil 3. has been done.

[0011] Since the present invention is configured as described above,
The film thickness of the amorphous thin strip is about several μm to several tens of μm, and the amount of coils 3 that can be stored in the slot 2 can be almost the same as that of the conventional one using a non-magnetic thin sheet wedge. Instead, it is possible to bring out the effect of a magnetic wedge. The amorphous thin strip 4b is adhered to form a sheet (or tape) in which the two stick together to form a band, and even when a magnetic wedge is applied to a conventional automatic wedge insertion machine, it does not peel off. Since there is no such thing, it can be inserted automatically. Further, with this configuration, the film thickness and material of the amorphous ribbon 4b can be easily changed, and the optimal magnetic material and film thickness can be obtained for each motor.

On the other hand, since the magnetic wedge 4 has a shape and dimensions similar to those of a conventional thin sheet material, the amount of coils 3 that can be stored in the slot 2 is almost the same as that of a conventional wedge using a non-magnetic thin sheet material. Not only can it be placed on the side, but it can also be expected to have the effect of a magnetic wedge. Furthermore, it is sheet-shaped, and the dimensions are different from that of conventional wedges.
The similarity in shape allows the use of conventional automatic wedge insertion machines.

Further, since the amorphous thin strip 4b is placed on the opposite side of the coil and the coil 3 is insulated by the thin sheet material 4a, the withstand voltage strength of the coil is improved, and the coil 3 is in contact with the thin sheet material 4a, and the coil 3 is insulated by the thin sheet material 4a. It has the effect of being less likely to get scratched.

Furthermore, since the adhesive is formed, even if a magnetic wedge is applied to the conventional automatic insertion of a wedge, it can be automatically inserted without peeling. Furthermore, since it is formed by adhesion, it can be manufactured at low cost. (Second example)

A thin strip 4b is adhered to the non-magnetic thin sheet material 4a, and a non-magnetic thin sheet material 4c which is thinner than the previous non-magnetic thin sheet material is further applied thereon.
Glue and make the three parts stick together. Then, the magnetic wedge 40 is inserted into the slot so that the thinner non-magnetic thin sheet material 4c is opposite to the coil 3. (See Figures 3 and 4)

The magnetic wedge is made by gluing thin leaf materials 4a and 4c of different thicknesses to both sides of an amorphous thin strip 4b, so that the three are firmly adhered and formed into one piece. The film thickness and material of 4b can be easily changed, and the optimum magnetic material and film thickness can be obtained for each electric motor.

Further, the thinner thin sheet material 4c sandwiches the amorphous ribbon 4b between them, and the thicker thin sheet material 4a connects the coil 3.
Since the coil 3 is insulated, the withstand voltage strength of the coil is improved, and since the coil 3 is in contact with the thin sheet material 4a,
This has the effect of reducing the chance of damage to the coil.

Furthermore, even if the magnetic wedge 4 is applied to a conventional automatic wedge insertion machine, since the thinner thin sheet material 4c protects the amorphous ribbon 4b, it will not peel off or be damaged during insertion. It can be inserted automatically because there is no need to It should be noted that the thin leaf materials 4a and 4c have different thicknesses, that is, 4c
Although an example has been described in which the structure is made of a thin sheet material, a material structure having the same thickness is also included in the present invention. (Third example)

Magnetic wedge 4 made by adhering an amorphous thin strip 41b having a size smaller than that of non-magnetic thin sheet material 4a.
form 1. (See FIG. 5) That is, the magnetic wedge 41 of the protruding portion from the stator core is made of an amorphous ribbon 41.
Since b is not bonded, voltage strength with the coil can also be ensured. (Fourth example)

In the magnetic wedge 40 of the second embodiment, an amorphous thin strip 4 having dimensions smaller than the dimensions of the non-magnetic thin sheet material 4a is used.
1b to form a magnetic wedge 42. (See Figure 6) (Further other embodiments)

In the above embodiments, an amorphous ribbon having a film thickness of several μm to several tens of μm was used as the magnetic material 4b, but the composition of this amorphous ribbon may be iron-based, cobalt-based, nickel-based, etc. Refers to any amorphous ribbon. Furthermore, the present invention is not limited to amorphous ribbons, and the use of ribbons of other magnetic materials is also included in the present invention.

On the other hand, the magnetic wedge material is made by adhering an amorphous thin strip 4b to a surface of a thin sheet material 4a that has been formed into irregularities by shot blasting or embossing, so that the two are firmly attached and integrated. The present invention also includes the case where it is made into a sheet-like (or tape-like) shape. Furthermore, by applying varnish treatment after the winding is completed, the thin sheet material 4a and the amorphous ribbon 4b can be firmly fixed.

[0023] Furthermore, as a method for manufacturing a magnetic wedge in the present invention, before forming a non-magnetic thin material such as a polyester film or aromatic aramid paper into a wedge shape, an amorphous thin strip is bonded and then shaped into a wedge shape. The present invention also includes forming a non-magnetic thin material such as polyester film or aromatic aramid paper into a wedge shape, then adhering an amorphous thin strip thereon, and then pressing it with a jig to form a wedge shape. included.

[0024] Regarding the method of adhering non-magnetic thin materials such as polyester film and aromatic aramid paper to amorphous thin strips, adhesives are used, and tapes with adhesive on both sides (double-sided tape) are used. The present invention is not limited to the above, and includes bonding by any method.

[0025]

As described above, according to the present invention, as a method of forming a material for a magnetic wedge, an amorphous thin strip is adhered to one side of a thin sheet material so that the two are brought into close contact, or an amorphous thin strip is formed using thin sheets of different thicknesses. Since the thin strips are glued together and the three parts are closely attached, the type of amorphous material and film thickness can be easily changed, making it possible to obtain a magnetic wedge that is optimal for various electric motors. In addition, since the dimensions and shape of the magnetic wedge can be formed to be approximately the same as those of conventional non-magnetic wedges, the amount of coils that can be stored in the slot can be the same as that of conventional non-magnetic wedges. Other effects (improvement of motor efficiency, power factor, reduction of electromagnetic noise, etc.) can also be expected.

Furthermore, it is also possible to apply a conventional automatic wedge insertion machine, and even when the wedge is automatically inserted, the thin material and the magnetic material are bonded to each other and will not peel off, as in the previous method. Since it is formed by adhesion, the magnetic wedge can be provided at low cost.

Furthermore, since the amorphous ribbon is formed on the side opposite to the coil, this is an effective method for improving the voltage resistance characteristics of the coil and preventing scratches on the coil. Further, since the amorphous thin strip is not adhered to the protruding portion of the stator core, voltage strength withstand with respect to the coil can be ensured.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a slotted insulating magnetic wedge according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a stator slot section.

FIG. 3 is a diagram corresponding to FIG. 1 of the second embodiment.

FIG. 4 is a diagram corresponding to FIG. 1 of the third embodiment.

FIG. 5 is a diagram corresponding to FIG. 2 of the third embodiment.

FIG. 6 is a diagram corresponding to FIG. 1 of the fourth embodiment.

FIG. 7 is a diagram corresponding to conventional FIG. 2;

FIG. 8 is a diagram corresponding to conventional FIG. 2;

FIG. 9 is a conventional diagram corresponding to FIG.

[Explanation of symbols]

1...Stator, 2...Slot,
3... Coil, 4, 40, 41, 42... Magnetic wedge,
4a, 4c... Thin leaf material, 4b... Amorphous thin strip,

Claims (4)

[Claims] [Claim 1] In contact with the inner surface of the fixed slot of the electric motor,
In addition, in a slot insulating magnetic wedge made of a non-magnetic thin material such as polyester film or aromatic aramid paper inserted so that the opening is located near the center of the slot, the center of one surface of the slot insulating magnetic wedge is inserted. 1. A slot insulating magnetic wedge characterized by having a thin amorphous material of approximately the same length as the stator core dimension adhered to the part. 2. The slotted insulating magnetic wedge according to claim 1, wherein an amorphous ribbon is bonded and a thin non-magnetic material is further bonded thereon. 3. The slotted insulating magnetic wedge according to claim 1, which is formed by adhering an amorphous ribbon having dimensions smaller than the dimensions of the non-magnetic thin sheet material. 4. The slotted insulating magnetic wedge according to claim 3, wherein the amorphous thin strip has a size smaller than that of the non-magnetic thin sheet material.