JPH06276705A - Stator for rotary machine - Google Patents

Abstract

PURPOSE:To increase efficiency of a stator coil by shortening the length of its circumference and at the same time to prevent a magnetic electrode core from being displaced when the magnetic electrode core and a yoke core are combined. CONSTITUTION:A magnetic electrode core 14 and a yoke core 15 are individually formed and combined through a divided surface 17 including irregular fitness. The outside surface of the combined part is forcedly fitted into a frame housing 3. Windings are arranged in the condition close to alignment by rotating the magnetic electrode core to shorten the length of its circumference. The positioning of the magnetic electrode core 14 against the yoke core 15 and the support of the magnetic electrode core 14 are performed in the fitting part of two places which are different in the fit-in direction. Since each fitting part can be formed into a simple phase, the press-in part becomes hard to deform and the position of the magnetic electrode core 14 becomes hard to displace.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator for a rotary electric machine used for an electric motor, a generator, etc., and more particularly to the structure of a magnetic pole part and a yoke part.

[0002]

2. Description of the Related Art Conventionally, as a stator of a rotary electric machine such as an electric motor or a generator, a magnetic pole portion having a pair of windings is arranged so as to be opposed to an inner peripheral side through a rotor accommodating space. There is. This type of stator will be described with reference to FIGS.

FIG. 5 is a sectional view of an electric motor assembled by using a conventional stator. The electric motor shown in the drawing is used as a power source for an electric blower. FIG. 6 is a front view showing a conventional stator core, which is a stator, FIG. 7 is a plan view of the same, and FIG. 8 is a front view showing a state in which a conventional stator is formed by winding windings on the stator core. 9 is a plan view of the same. The stator shown in these figures is disclosed in Japanese Patent Application Laid-Open No. 3-190542.

In these figures, 1 is a stator, 2 is a rotor accommodated inside the stator 1, and these are fan-shaped frame housings 3 formed in a substantially bottomed tubular shape.
It is installed inside. Reference numeral 4 denotes a bracket that rotatably supports the impeller-side shaft end of the rotor 2, and the bracket 4 is fixed to the frame housing 3 so as to close the front opening of the frame housing 3. The shaft end of the rotor 2 opposite to the impeller side is rotatably supported by the bottom of the frame housing 3. 5
Is an impeller fixed to one shaft end of the rotor 2,
Reference numeral 6 is an air guide for guiding the air blown from the impeller 5.

The stator 1 is formed by winding a stator coil 8 around a stator core 7 shown in FIGS. 6 and 7.
The stator core 7 is composed of a pair of magnetic pole portions 7a facing each other through the rotor housing space, and a yoke portion 7b integrally provided on the magnetic pole portions 7a and forming a magnetic circuit. It was shaped like a letter. The portion around which the stator coil 8 is wound and the portion facing the stator core 8 are covered with the resin 9 by insert molding or the like.

In the rotor 1 thus constructed, when winding the stator core 7, the yoke portion 7b integrally formed with the magnetic pole portion 7a is a hindrance, so that the stator core 7
The nozzle of the automatic winding machine (not shown) was inserted into the inner gap of the. That is, the magnet wire to be the stator coil 8 is led out from this nozzle, and the nozzle is turned so as to draw a constant elliptical orbit around the magnetic pole portion 7a, and the magnet wire is wound around the magnetic pole portion 7a.
By winding the stator core 7 shown in FIGS. 6 and 7 as described above, the stator 1 is formed as shown in FIGS. 8 and 9.

[0007]

However, in the stator core 7 in which the magnetic pole portion 7a and the yoke portion 7b are integrally formed as described above, the stator core 7 rotates around the magnetic pole portion 7a in a constant elliptical orbit. The problem is that the magnet wire has to be wound around by a driven nozzle to perform winding. That is, the position where the magnet wire is wound is not fixed, and the stator coil 8 cannot be wound with high density. Therefore, the outer diameter of the stator coil 8
As the thickness increases, the circumferential length of the stator coil 8 becomes excessively long, and the copper loss due to the heat generated from the stator coil 8 during rotational driving increases, thereby increasing the efficiency of the rotating electric machine. There was also a limit.

To solve such a problem, the magnetic pole portion may be formed separately from the yoke portion, and after the winding to the magnetic pole portion, the magnetic pole portion may be fixed to the yoke portion. An example of the stator having such a structure is disclosed in Japanese Utility Model Laid-Open No. 2-7749.

The stator core shown in this publication is formed by forming the yoke portion in an annular shape and press-fitting a pair of magnetic pole portions into the inner peripheral portion of the yoke portion. That is, the stator core had a structure in which the pair of magnetic pole portions and the annular yoke portion were divided into three parts. In addition, the press-fitting fitting portion between the magnetic pole portion and the yoke portion is formed in a groove shape. In order to form a stator using this stator core, first, winding is applied to each magnetic pole part,
After that, the magnetic pole portions were press fitted into the yoke portions respectively.

However, with such a structure in which the magnetic pole portion and the yoke portion are coupled via the dovetail groove-like fitting portion, when the magnetic pole portion after winding is press-fitted into the yoke portion, it is pushed. There is a problem that the fitting portion is likely to be locally deformed by the pressure.
When the fitting portion is deformed in this way, the magnetic pole portion is displaced, the air gap between the stator core and the rotor becomes non-uniform, and the characteristics of the rotating electric machine deteriorate, or abnormal noise is generated during rotation. It is easy to occur. Further, there is a problem that the base of the magnetic pole portion (the connecting portion with the yoke portion) becomes narrow, and the amount of grip of the magnetic pole portion when winding the magnetic pole portion is reduced.

The present invention has been made in order to solve such a problem, and shortens the circumferential length of the stator coil wound around the magnetic pole portion to improve the efficiency, and at the same time, the magnetic pole portion and the yoke portion are separated from each other. The purpose is to prevent the magnetic poles from being displaced during coupling.

[0012]

In a stator for a rotary electric machine according to the present invention, a magnetic pole portion and a yoke portion are individually formed, and the yoke portions are arranged on both sides in the radial direction of the rotor with respect to the magnetic pole portion. At the same time, both of them are coupled through a coupling portion formed at each end portion, which is formed by concavo-convex fitting, and the outer surface of this coupling portion is press-fitted into the tubular housing for supporting the stator. .

[0013]

Operation: The winding can be performed by rotating the magnetic pole portion and winding the magnet wire around the magnetic pole portion,
It is wound around the magnetic pole part in a state close to alignment. Further, since the positioning of the magnetic pole portion with respect to the yoke portion and the support of the magnetic pole portion are performed by two fitting portions having different fitting directions, when positioning and supporting both of them is performed by one fitting portion. In comparison, each fitting portion can be formed in a simple shape. That is, even if press-fitting is performed when assembling the stator, the press-fitting portion is unlikely to be deformed.

[0014]

EXAMPLES Example 1. An embodiment of the present invention will be described below in detail with reference to FIG. FIG. 1 is a front view showing a state in which a stator for a rotary electric machine according to the present invention is mounted on a stator supporting frame housing. In the figure, the stator coil is shown broken to facilitate understanding of the shape of the stator core. Further, in the figure, the same or equivalent members as those described in FIG. 5 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, 11 is a stator, and this stator 11 includes a stator core 12 and a stator coil 13 which will be described later.
And is press-fitted into the tubular portion of the frame housing 3 to be supported and fixed to the frame housing 3. The stator core 12 is formed of a magnetic pole core 14 as a magnetic pole portion around which the stator coil 13 is wound, and a yoke core 15 as a yoke portion.

The two magnetic pole cores 14 are provided so as to face each other with a space accommodating the rotor 2 interposed therebetween.
Reference numeral 5 is arranged between the magnetic pole cores 14 and on both sides of the rotor 2 in the radial direction. That is, in FIG. 1, the magnetic pole cores 14 are arranged vertically, and the yoke cores 15 are arranged on both left and right sides of the magnetic pole cores 14.
The magnetic pole core 14 and the yoke core 15 are denoted by reference numeral 1 in the figure.
They are connected to each other via a dividing surface indicated by 7.

In other words, the magnetic pole core 14 and the yoke core 1
5 is a core forming member having a substantially square shape when viewed from the front, which is integrally formed and has four corners formed in a shape that can be press-fitted into the frame housing 3 and is divided into four by a dividing surface 17 located at the four corners. It is formed by doing. The dividing surface 17 constitutes the connecting portion according to the present invention.

The split surface 17 is composed of the magnetic pole core 14 and the yoke core 1.
5 and one of them are projected in a semicircular shape when viewed from the front, and the other is recessed in the same shape as that to form a fitting structure. In the embodiment, convex portions having a semicircular cross section are formed at both ends of the magnetic pole core 14, and concave portions to which the convex portions are fitted are formed at both ends of the yoke core 15. The split surface 17 extends from the axial center of the rotor 2 to the stator 1
1 and a frame housing 3 are formed along an imaginary line (indicated by a chain line in the figure) extending toward a press-fitting fitting portion.

Reference numeral 16 is an insulating resin material for insulating between the stator coil 13 and the magnetic pole core 14. The insulating resin material 16 is formed integrally with the magnetic pole core 14 by, for example, insert molding so as to cover the winding portion of the magnetic pole core 14.

To assemble the stator thus formed, first, the magnetic pole core 14 formed separately from the yoke core 15 and having the insulating resin material 16 formed therein is wound. This winding is performed, for example, by mounting the outer peripheral portion of the magnetic pole core 14 on a rotary spindle (not shown), rotating the magnetic pole core 14, and winding a magnet wire around it. At this time, the magnet wire is fed out from the nozzle while applying an appropriate tension, and the nozzle is moved to the spindle and the magnetic pole core 1.
Finely move in the direction of the rotation axis in coordination with the rotation of 4.

After the winding is completed, the magnetic pole core 14 and the yoke core 15 are fitted together by the dividing surfaces 17 to be integrated, and this assembly is fitted into, for example, a cylindrical jig (not shown). Hold it temporarily. Then, this cylindrical jig is brought into axial contact with the frame housing 3 coaxially with the opening of the axial end of the frame housing 3, and in this state the assembly inside the cylindrical jig is placed inside the frame housing 3. Press fit. This press-fitting is accurately performed so that the axial end surfaces of the magnetic pole core 14 and the yoke core 15 are simultaneously pressed by a pressing device (not shown) or the like so that the split surface 17 is not unduly deformed. In this way, the stator 11 having the magnetic pole core 14 and the yoke core 15 can be loaded in the frame housing 3.

Therefore, the winding can be performed by rotating the magnetic pole core 14 and winding the magnet wire around the magnetic pole core 14, so that the magnetic pole core 14 can be wound in a state close to the alignment. Further, the magnetic pole core 14 and the yoke core 15 after winding are positioned with respect to each other by concave and convex fitting, and are press-fitted into the frame housing 3 to be supported thereby. Therefore, the yoke core 15
The positioning of the magnetic pole core 14 with respect to the magnetic pole core 14 and the support of the magnetic pole core 14 are performed by the two fitting portions having different fitting directions. The fitting portion can be formed into a simple shape. That is, even if press-fitting is performed when assembling the stator 11, the press-fitting portion is unlikely to be deformed.

Example 2. In the above-described embodiment, an example is shown in which the semicircular convex portion and the concave portion are formed on the division surface which becomes the connecting portion, but the V-shaped convex portion and the concave portion may be formed as shown in FIG.
FIG. 2 is a front view showing another embodiment of a stator having a V-shaped concavo-convex fitting structure for the connecting portion. In FIG. 2, the same or equivalent members as those described in FIG. 1 and FIG. The same reference numerals are given and detailed description is omitted.

In FIG. 2, reference numeral 18 denotes a split surface between the magnetic pole core 14 and the yoke core 15, and the split surface 18 is the magnetic pole core 1.
4 is provided with convex portions projecting in a substantially V-shape in a front view, and V-shaped concave portions with which the convex portions are fitted are provided at both end portions of the yoke core 15, thereby forming a concavo-convex fitting structure. ing.

The magnetic pole core 14 used in this embodiment is
The insulating resin material 16 molded on the stator coil winding portion has a structure different from that of the above-described embodiment. That is, as shown in FIG. 2, a collar body that crosses an arcuate portion of the magnetic pole core 14 that faces the outer peripheral surface of the rotor 2 is integrally formed. The collar body linearly protrudes from the magnetic pole core 14 toward the yoke core 15, and also from the magnetic pole core 14 to the rotor 2.
It linearly projects to both sides along the axial direction of. The position where the collar body is formed is the position where the collar body crosses the outer peripheral portion of the rotor 2 when the rotor 2 is inserted between the magnetic pole cores 14 and viewed from the axial end. It is said that.

When the collar body is formed on the insulating resin material 16 in this way, the stator coil 13 is formed outside the collar body in the radial direction of the rotor 2. Then, when the stator coil 13 is wound up, the stator coil 13 covers the core of the rotor 2 and the rotor coil from the outside in the radial direction with a gap. More specifically, when viewed from the shaft end side, the shape is covered linearly as shown in FIG. 2, and when viewed in the radial direction, the shape is covered in a half moon shape.

That is, the shape of the stator coil 13 viewed from the axial end side of the rotor 2 is not a curved shape substantially along the curvature of the rotor 2 but a shape close to a straight line. The circumference is even shorter. Therefore, the efficiency of the rotary electric machine can be further improved.

In assembling the stator 11 shown in the present embodiment into the frame housing 3, the magnetic pole core 14 and the yoke core 15 having the windings are joined together through the dividing surface 18 to form a cylindrical jig. When the rotor 2 is inserted between the cores, the rotor 2 is inserted between the cores. At this time, both ends of the rotary shaft of the rotor 2 are held while being held by shaft support members (not shown). Then, the assembly (in this case, the magnetic pole core 14, the yoke core 15 and the rotor 2) in the cylindrical jig is loaded into the frame housing 3 with the cylindrical jig facing the frame housing 3.

Example 3. The insulating resin material 16 formed on the magnetic pole core 14 may be equipped with a terminal for connecting a coil end of the stator coil 13 in addition to the collar body. This example will be described with reference to FIG.

FIG. 3 is a perspective view showing another example in which the connecting terminals for coil terminals are attached to the insulating resin material of the magnetic pole core. In FIG. 3, the stator core 12 is partially broken. In the figure, the same or equivalent members as those described in FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 3, reference numeral 21 is a terminal processing post for locking the connection fitting 22. This terminal processing post 2
1 is formed integrally with the insulating resin material 16 and is formed so as to project in the axial direction of the rotor with respect to the magnetic pole core 14.
The formation position is two side portions on the yoke core 15 side of the magnetic pole core 14. Further, as the connection fitting 22, a conventionally known one that is engaged with the terminal processing post 21 is used, and has a structure to which a coil end of a stator coil (not shown) is connected.

When the terminal processing post 21 is provided in this manner, the winding is performed in the same manner as in the first embodiment, but the terminal of the stator coil uses the connecting fitting 22 attached to the terminal processing post 21. The magnetic pole core 14 is connected and fixed in a single state. That is, conventionally, the coil end is pulled out after the stator core is mounted on the frame housing and the joining process is performed on the brush and the lead wire of the rotating machine. However, when configured as in this embodiment, the frame housing 3 Since the coil end is connected and fixed to the connection metal fitting 22 on the end processing post 21 during press-fitting into, the coil end does not interfere with press-fitting into the frame housing.

Example 4. As shown in FIG. 4, the outer surface of the stator coil can be covered with a resin material. FIG. 4 is a perspective view showing another example in which the stator coil is subjected to mold coating. In the figure, the same or equivalent members as those described in FIGS. 1 and 3 are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 4 shows a state in which the outer surface of the stator coil 13 wound as in the first or second embodiment is covered with a mold coating 23 of an insulating resin. In the mold coating 23, the magnetic pole core 14 whose winding has been completed is loaded into a molding die (not shown), a liquid resin material is injected into the molding die, and the resin material is cured in the molding die. After that, it is formed by taking out the magnetic pole core 14 from the molding die. Even when the mold coating 23 is applied as described above, the press fitting into the frame housing is performed in the same manner as in the first embodiment.

As the resin material for the mold coating 23, any material can be used as long as it can withstand the heat generation of the rotating electric machine, has dielectric strength, and has high thermal conductivity. For example, an epoxy resin can be used.

By applying the mold coating 23 in this way, the heat dissipation of the stator coil 13 is improved, and when the magnetic pole core 14 shown in the figure is incorporated in a conductive blower, the surface of the stator coil 13 is formed smooth. It is possible to reduce the windage loss of the blower.

[0036]

As described above, in the stator for a rotary electric machine according to the present invention, the magnetic pole portion and the yoke portion are individually formed, and the yoke portion is provided on both sides in the radial direction of the rotor with respect to the magnetic pole portion. In addition to arranging them, both of them are connected via a connecting portion formed by concave and convex fitting formed on each end, and the outer surface of the connecting portion is press-fitted into the tubular housing for supporting the stator. The wire can be formed by rotating the magnetic pole portion and winding a magnet wire around the magnetic pole portion, and the magnetic wire is wound around the magnetic pole portion in a state of being almost aligned.

Therefore, the stator coil can be wound at a high density, and the circumferential length is 10% as compared with the conventional one.
It can be shortened by about 30%. Therefore, the copper loss existing in the stator coil can be suppressed to be small, and the efficiency of the rotating electric machine can be improved.

Further, the positioning of the magnetic pole portion with respect to the yoke portion and the support of the magnetic pole portion are performed by two fitting portions having different fitting directions.
Each fitting portion can be formed in a simple shape as compared with the case where the fitting portion is provided at each position. That is, even if press-fitting is performed when assembling the stator, the press-fitting portion is unlikely to be deformed.

Therefore, since an unreasonable force is not applied to the connecting portion between the magnetic pole portion and the yoke portion, they are not deformed,
The air gap between the stator and the rotor can be made substantially uniform over the entire area. Therefore, the characteristics of the rotating electric machine are not deteriorated and no abnormal noise is generated during rotation. Moreover, since there is no fitting portion in the magnetic pole portion on the axial line of the stator coil, when winding the magnetic pole portion, the relatively wide portion should be held by the rotary drive device or the like. You can

[Brief description of drawings]

FIG. 1 is a front view showing a state in which a stator for a rotary electric machine according to the present invention is mounted on a stator supporting frame housing.

FIG. 2 is a front view showing another embodiment of a stator having a V-shaped concavo-convex fitting structure for a connecting portion.

FIG. 3 is a perspective view showing another example in which a coil terminal connection terminal is attached to an insulating resin material of a magnetic pole core.

FIG. 4 is a perspective view showing another example in which the stator coil is subjected to mold coating.

FIG. 5 is a sectional view of an electric motor assembled using a conventional stator.

FIG. 6 is a front view showing a stator core which is a conventional stator.

FIG. 7 is a plan view showing a stator core that serves as a conventional stator.

FIG. 8 is a front view showing a state where a stator core is wound to form a conventional stator.

FIG. 9 is a plan view showing a state in which a conventional stator is formed by winding a stator core.

[Explanation of symbols]

 2 rotor 3 frame housing 11 stator 12 stator core 13 stator coil 14 magnetic pole core 15 yoke core 17 split surface 18 split surface

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Arai 1728 Omaeda 1 Omaeda, Hanazono-cho, Osato-gun, Saitama Prefecture Within Mitsubishi Electric Home Equipment Co., Ltd. (72) Inventor Yuji Nakahara 8-1-1 Tsukaguchihonmachi, Amagasaki-shi No. Sanryo Electric Co., Ltd. Production Technology Research Laboratory (72) Inventor Nobuaki Miyake 8-1-1 Tsukaguchi Honcho, Amagasaki City, Hyogo Prefecture Sanryo Electric Co., Ltd. Production Technology Research Center (72) Inventor ▲ Hiji ▼ Yoshio Hyogo 8-1, Tsukaguchi Honcho, Amagasaki-shi, Sanritsu Electric Manufacturing Co., Ltd. (72) Inventor Koichi Nishimura 8-1-1, Tsukaguchi Honcho, Amagasaki-shi, Hyogo Sanritsu Electric Co., Ltd.

Claims (1)

[Claims] 1. A pair of magnetic pole portions facing each other with a rotor accommodating space interposed therebetween and having respective windings, and a yoke portion provided between these magnetic pole portions to form a magnetic circuit. In a stator for a rotating electric machine, the magnetic pole portion and the yoke portion are individually formed, the yoke portions are arranged on both sides of the magnetic pole portion in the radial direction of the rotor, and both are formed at respective end portions. The concave and convex parts are joined together through a connecting part,
A stator for a rotary electric machine, wherein an outer surface of the connecting portion, which is an outer side in a radial direction of the rotor, is press-fitted into a tubular housing for supporting the stator.