JP2001339880A - Motor stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor stator capable of improving motor characteristics by reducing eddy current loss caused by eddy current resulting from the fluctuation of magnetic flux at the front end of the magnetic pole section of a stator. SOLUTION: A stator core 1a of the motor is formed by bundling insulated iron wires 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor stator, and more particularly to a stator structure suitable for an AC commutator motor such as a vacuum cleaner.

[0002]

2. Description of the Related Art FIG. 10 shows a main part of a conventional AC commutator motor used in a vacuum cleaner and the like, and FIG. 11 shows a perspective view of a stator core.

The core 1a and the rotor 2 of the conventional stator 1
Is formed by laminating non-oriented silicon steel sheets. The yoke portion 11 and the magnetic pole portion 12 are provided on the stator core 1a.
Are formed, and a slot portion 21 and a tooth portion 22 are formed in the rotor core 2a.

A winding (not shown) made of a copper wire is provided on each of a tooth root portion (hereinafter referred to as a winding portion) 13 for winding a winding in the magnetic pole portion 12 of the stator core 1a and a tooth portion 22 of the rotor core 2a. Are wound, and each winding is connected via a commutator.

FIG. 12A shows a state in which a winding 1b is wound around the stator core 1a (the rotor is omitted).
(B) shows the side view.

[0006]

By the way, the rotor 2 of the vacuum cleaner rotates at a high speed of 30,000 or more per minute. An opening 23 is formed between each tooth portion 22 of the rotor core 2a.
As shown in FIG. 13, the magnetic flux passing through the teeth 22 is attracted toward the teeth 22 from a portion facing the openings 23 due to the presence of the openings 23 between the teeth 22.

The rotation of the rotor 2 causes the stator core 1a
The relative position between the magnetic pole portion 12 of the rotor core 2a and the tooth portion 22 of the rotor core 2a deviates from each other.

In an AC commutator motor such as a vacuum cleaner, the number of teeth is large, the number of teeth is large, the fluctuation of the magnetic flux is large, and the eddy current flows in proportion to the square of the frequency of the fluctuation. Many eddy current losses occur at the tip of the magnetic pole portion 12.

Further, since the eddy current loss is proportional to the square of the thickness of the plate, the conventional motor stator 1 is formed by laminating thin silicon steel plates 14 in order to reduce the eddy current loss. Further improvement is desired.

In the conventional stator core 1a formed by laminating non-oriented silicon steel plates 14, the winding portion 13 around which the winding 1b is wound has a rectangular cross section. Can not be wound tightly along the right angle of the square, so that there is a useless space S on each side of the square as shown in FIG.
Copper loss increases and efficiency decreases.

Accordingly, the present invention has been made to solve such a problem, and reduces eddy current loss caused by eddy current generated by fluctuation of magnetic flux at the tip of a magnetic pole of a stator, thereby improving motor characteristics. It is an object of the present invention to provide a motor stator that can be improved.

In addition, when a winding is wound on the stator, useless space is reduced, and the winding length can be reduced with the same number of turns.
It is an object of the present invention to provide a motor stator capable of reducing copper loss and improving motor characteristics.

[0013]

In order to achieve the above object, the present invention is characterized in that a stator core of a motor is formed by bundling insulated wires.

Further, the bundle of wires is hardened with a bonding agent such as varnish.

[0015] Further, the bundle of wires is molded and solidified with a resin.

[0016] Further, the bundle of wires is hardened by bundling and sintering wires molded with resin.

On the other hand, the present invention is characterized in that the stator core of the motor is constituted by using a soft magnetic steel powder metal molding material and including an insulated wire inside.

Further, the magnetic pole portion of the stator core of the motor is formed of a soft magnetic steel powder metal molding material, and the yoke portion of the stator core is formed by bundling insulated wires.

Further, the wire is extended to the inside of the magnetic pole portion of the stator core.

Further, the cross-sectional shape of the wire is a quadrangle.

Further, the cross-sectional shape of the winding portion for winding the winding of the stator core is a shape such as a circle having the same cross-sectional area and the outer periphery shorter than a square.

[0022]

Embodiments of the present invention will be described below in detail with reference to the drawings. Since the present invention has a feature in the configuration of the stator core in the motor stator, the following drawings show only the stator core before the winding is wound in order to clearly show the configuration.

FIG. 1 is a perspective view of a stator core according to a first embodiment of the present invention, in which the same reference numerals as those in the above-mentioned prior art indicate the same or corresponding parts.

In the stator 1 of the present embodiment, an iron wire 15 having a diameter smaller than that of a conventional silicon steel sheet and coated with an insulating coating is bundled into a predetermined shape, and the bundle is fixed with a varnish or the like.
It is what constituted. That is, the whole of the yoke portion 11, the magnetic pole portion 12, and the winding portion 13 for winding the winding (not shown) of the stator core 1a are formed by a bundle of iron wires 15.

With this configuration, the fluctuation of the magnetic flux appearing at the tip of the magnetic pole portion 12 of the stator core 1a is reduced in the insulated coated iron wire 15 having a diameter smaller than that of the silicon steel plate, as compared with the conventional stator in which the silicon steel plates are laminated. By reducing the eddy current and the occurrence of eddy current loss by confining, the motor characteristics can be improved.

FIG. 2 is a perspective view of a stator core according to a second embodiment of the present invention, and the same reference numerals as those of the above-described embodiment indicate the same or corresponding parts.

The stator 1 according to the present embodiment has a stator core 1a formed by bundling an iron wire 16 having a thickness smaller than that of a conventional silicon steel sheet and having a rectangular cross section and coated with an insulating coating, and solidifying it with a varnish or the like. is there.

Thus, similarly to the above-described embodiment,
An eddy current that appears at the tip of the magnetic pole portion 12 of the stator core 1a is reduced as compared with a conventional stator in which silicon steel sheets are laminated.
By reducing the occurrence of eddy current loss, motor characteristics can be improved. Furthermore, by making the cross-sectional shape of the iron wire 16 a quadrangle, the density when the iron wires 16 are bundled can be increased, and the shape can be reduced with the same magnetic resistance as when bundling iron wires having a round cross section.

In each of the above embodiments, the iron wire 15
Alternatively, as a means for bundling the 16 bundles, if a bonding agent such as varnish is used, the structure can be inexpensively. However, if the resin is molded and solidified, the strength can be increased, and furthermore, the resin molded with resin If the iron wires 15 or 16 are bundled and solidified by sintering, the iron wires can be securely fixed to each other, and the strength can be further increased.

FIG. 3 is a perspective view of a stator core according to a third embodiment of the present invention, and FIGS. 4 and 5 are vertical and horizontal sectional views showing the internal structure of the stator core. Reference numerals indicate the same or corresponding parts.

In the stator 1 of the present embodiment, a soft magnetic steel powder metal forming material 17 is used for the entire stator core 1a, and the same iron wire 15 as that of the first embodiment is included therein, and the winding is wound. The shape of the wound portion 13 to be wound is circular, and the winding is formed so that the length of the winding can be reduced. By making the winding portion 13 around which the winding is wound circular,
As shown in FIG. 4, the yoke portion 11 divided into two sides is formed in a semicircular shape having an arcuate inside. Also,
As shown in FIG. 5, the magnetic pole portion 12 is formed only of the soft magnetic steel powder metal molding material 17, and the tip end surface has a smooth arc shape.

Conventionally, when a stator is formed by laminating non-oriented silicon steel sheets, a silicon steel sheet is punched out with the same mold having the shape of a stator core, and then laminated and bound. Although the cross-sectional shape of the winding portion 13 to be wound is square, in the present embodiment, the stator core 1a is formed using the thin iron wire 15 and the soft magnetic steel powder metal forming material 17 having the following characteristics. Thereby, the shape as described above can be easily obtained.

As shown in FIG. 6, the soft magnetic steel powder metal molding material 17 is obtained by covering the surface of powdered iron particles 5 having a size of about 100 μm with an insulating coating 51. Since the insulating coating 51 covers each particle 5 and remains as it is even after high-pressure compression, the soft magnetic steel powder metal forming material 17 is characterized in that eddy current is small even at high frequencies.

The strength by molding can be obtained by adding the binder 52 or by binding the particles 5 by a reaction during heat treatment at about 500 ° C. The shape can be easily adjusted to a desired shape by using a mold. Can be molded into

Although it is conceivable to form the entire stator core 1a using only such soft magnetic steel powder metal molding material 17, since the magnetic permeability is only about 1/6 that of a silicon steel sheet, the leakage magnetic flux is reduced at the yoke. This increases the magnetic circuit efficiency, which is not preferable.

Therefore, in the stator 1 of the motor according to the present embodiment, as described above, the iron wire 15 having high magnetic permeability is included in the stator core 1a, and the whole is formed of the soft magnetic steel powder metal molding material 17, and the winding is formed. The winding portion 13 to be wound is configured to have a shape such as a circular shape in which the winding is shortened.

As a result, in the stator core 1a, the eddy current appearing at the tip of the magnetic pole portion 12 is reduced to reduce the occurrence of the eddy current loss while the magnetic permeability is sufficiently secured by the internal iron wire 15, and the entire stator 1 is wound. However, since the length of the stator can be shorter than that of a conventional stator in which silicon steel sheets are laminated, copper loss can be reduced and motor characteristics can be improved. The cross-sectional shape of the winding portion 13 of the winding is not limited to a circle, but may be a polygon having a pentagon or more, an ellipse, or an R in a corner as long as the cross section has the same cross-sectional area and the outer periphery is shorter than a quadrangle. A certain effect can be obtained even with a bent shape.

The first and second embodiments (FIGS. 1 and 2)
Since the magnetic pole portion 12 of the stator core 1a in FIG. 2) is in a state in which the iron wire 15 or 16 is cut, the gap with the tooth tip of the rotor is hardly uniform.

On the other hand, in this embodiment, since the magnetic pole portion 12 is formed of the soft magnetic steel powder metal molding material 17, the tip of the magnetic pole portion 12 can be formed in a smooth arc shape, so that the rotor The gap with the tip of the tooth portion can be made uniform, and also in this regard, the motor characteristics can be improved.

FIG. 7 is a perspective view of a stator core according to a fourth embodiment of the present invention, and the same reference numerals as those of the above-described embodiment indicate the same or corresponding parts.

In the stator 1 of this embodiment, the magnetic pole portion 12 of the stator core 1a is made of a soft magnetic steel powder metal molding material 17.
The yoke portion 11 is formed by bundling and combining iron wires 15 coated with insulation. That is, the yoke portion 11 of the stator core 1a is formed by bundling a thin iron wire 15 having the same insulation coating as in the first embodiment into a predetermined shape and solidifying it with a varnish or the like.
Is formed by compressing and sintering a soft magnetic steel powder metal molding material 17 into a magnetic pole shape as shown in the figure, and combining the magnetic pole portion 12 and the yoke portion 11 to form the stator core 1a.

Even with this configuration, the stator core 1a
The eddy current that appears at the tip of the magnetic pole portion 12 of the stator core 1a is reduced by reducing the occurrence of eddy current loss while the magnetic permeability at the yoke portion 11 is kept good, and the gap between the tip of the rotor tooth portion is reduced. Since they can be made uniform, the motor characteristics can be improved.

FIG. 8 is a perspective view of a stator core according to a fifth embodiment of the present invention, and the same reference numerals as those of the above-described embodiment indicate the same or corresponding parts.

The stator 1 of the present embodiment is such that the winding portion 13 of the winding formed by the bundle of the iron wires 15 is substantially circular with respect to the stator core 1a of the fourth embodiment (FIG. 7). is there. By making the winding portion 13 substantially circular, the yoke portion 11 formed by a bundle of iron wires 15 divided into two parts from the winding portion 13 is formed in a substantially semicircular shape in which the inside has a substantially circular arc shape.

With such a configuration, the fourth
In addition to the functions and effects of the embodiment, since the winding portion 13 of the winding is substantially circular, the winding can be shorter than a stator in which conventional silicon steel sheets are laminated, so that copper loss can be reduced. The motor characteristics can be improved.

FIG. 9 is a horizontal sectional view of a stator core according to a sixth embodiment of the present invention, in which the same reference numerals as those of the above-mentioned embodiment indicate the same or corresponding parts.

In the present embodiment, the iron wire 15 of the fourth embodiment (FIG. 7) is extended to the inside of the magnetic pole portion 12 formed of the soft magnetic steel powder metal molding material 17.

With this configuration, the tip of the magnetic pole portion 12 where the eddy current appears is covered with the soft magnetic steel powder metal forming material 17, so that substantially the same operation and effect as in the fourth embodiment can be obtained, and the magnetic pole can be obtained. Since the magnetic permeability in the portion 13 can be increased, the motor characteristics can be further improved. Such a modification can be applied to the third embodiment (FIGS. 3 to 5) and the fifth embodiment (FIG. 8).

Note that the third to sixth embodiments (FIGS.
In FIG. 9), by using the iron wire 16 having a rectangular cross section similar to that of the second embodiment (FIG. 2), the density when the iron wires 16 are bundled is increased, and the same as when the iron wire 15 having a round cross section is bundled. The shape can be reduced by the magnetic resistance.

[0050]

As described above, according to the present invention, by forming the stator core of the motor by bundling insulated wires, the eddy current can be reduced as compared with the conventional structure in which silicon steel sheets are laminated, and the eddy current can be reduced. By reducing the occurrence of loss, motor characteristics can be improved.

If the bundle of wires is solidified with a bonding agent such as varnish, it can be constructed at low cost.

Further, if the bundle of wires is molded and solidified with a resin, the strength can be increased.

If the bundle of wires is solidified by bundling and sintering the wires molded with resin, the wires can be securely fixed to each other and the strength can be further increased.

On the other hand, by forming the stator core of the motor using a soft magnetic steel powder metal molding material and including an insulated wire inside, the magnetic pole portion can be secured while the magnetic permeability of the inner wire is kept good. Since the occurrence of eddy current loss is reduced by reducing the eddy current appearing at the tip, and the gap between the tip of the rotor and the tip of the rotor can be made uniform, the motor characteristics can be improved.

Further, the magnetic pole portion of the stator core of the motor is formed of a soft magnetic steel powder metal molding material, and the yoke portion of the stator core is formed by bundling insulated wires so that the magnetic permeability at the yoke portion is ensured well. However, since the occurrence of eddy current loss is reduced by reducing the eddy current that appears at the tip of the magnetic pole portion, and the gap between the tip of the rotor and the tip of the rotor can be made uniform, the motor characteristics can be improved.

Further, by extending the wire to the inside of the magnetic pole portion of the stator core, the tip of the magnetic pole portion where the eddy current appears is covered with the soft magnetic steel powder metal molding material, so that substantially the same operation and effect as described above can be obtained. Since the magnetic permeability in the magnetic pole portion can be increased, the motor characteristics can be further improved.

Further, by forming the cross section of the wire into a square shape, the density when the wires are bundled can be increased, and the shape can be reduced with the same magnetic resistance as when the wires having a round cross section are bundled.

Further, by forming the cross-sectional shape of the winding portion of the stator core around which the winding is wound into a shape such as a circle having the same cross-sectional area and an outer periphery shorter than a quadrangle, the winding is made of a conventional silicon steel plate. , The copper loss can be reduced, and the motor characteristics can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of a stator core according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a stator core according to a second embodiment of the present invention.

FIG. 3 is a perspective view of a stator core according to a third embodiment of the present invention.

FIG. 4 is a vertical sectional view of the stator core of FIG. 3;

FIG. 5 is a horizontal sectional view of the stator core of FIG. 3;

FIG. 6 is a composition diagram of a soft magnetic steel powder metal molding material.

FIG. 7 is a perspective view of a stator core according to a fourth embodiment of the present invention.

FIG. 8 is a perspective view of a stator core according to a fifth embodiment of the present invention.

FIG. 9 is a horizontal sectional view of a stator core according to a sixth embodiment of the present invention.

FIG. 10 is a main part configuration diagram of a conventional AC commutator motor used for a vacuum cleaner or the like.

FIG. 11 is a perspective view of a conventional stator core.

FIG. 12 is a diagram showing a state where a winding is wound around a conventional stator core.

FIG. 13 is a diagram showing the flow of magnetic flux between a conventional stator core and a rotor core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 1a Stator core 1b Stator winding 11 Yoke part 12 Magnetic pole part 13 Winding part 14 Silicon steel plate 15, 16 Iron wire 17 Soft magnetic steel powder metal molding material 2 Rotor 2a Rotor core 21 Slot part 22 Teeth part 23 Opening 5 Pure iron powder Particles 51 Insulation coating 52 Binder

Claims (9)

[Claims] 1. A stator for a motor, wherein a stator core of the motor is formed by bundling insulated wires. 2. The motor stator according to claim 1, wherein the bundle of wires is solidified with a bonding agent such as varnish. 3. The motor stator according to claim 1, wherein the wire bundle is molded by resin and solidified. 4. The motor stator according to claim 1, wherein the bundle of wires is solidified by bundling and sintering wires molded with resin. 5. The motor stator according to claim 1, wherein the stator core of the motor is formed by using a soft magnetic steel powder metal molding material and including an insulated wire inside. 6. A motor stator according to claim 1, wherein the magnetic pole portion of the stator core of the motor is formed of a soft magnetic steel powder metal molding material, and the yoke portion of the stator core is formed by bundling insulated wires. 7. The motor stator according to claim 5, wherein the wire is extended to the inside of a magnetic pole portion of the stator core. 8. The motor stator according to claim 1, wherein a cross-sectional shape of the wire is rectangular. 9. A cross section of a winding portion of the stator core for winding a winding of the stator core, the cross section having the same cross-sectional area, such as a circle, having an outer periphery shorter than a quadrangle. Item 10. A stator for a motor according to any one of Items 8.