JPH1028362A - Stator for permanent-magnet generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the need for providing a faucet joint section in a base plate made of a resin, so as to omit the process for fixing the base plate to an armature core with screws at the time of assembling a stator by constituting a bobbin-base plate molded body by integrally molding the base plate and a bobbin with a resin. SOLUTION: A base plate 5, formed of a resin and a bobbinbase plate molded body, is constituted by molding a resin so that the base plate 5 can be united with bobbins 401-408. An armature core is integrated with the molded body, by burying a prescribed section in the molded body in the armature core. At the time of integrating the armature core with the molded body, at least the outer peripheral surfaces of the magnetic pole sections 301a-308a of the armature core are left exposed. It is preferable, in addition, to keep most A of the end face of a yoke section 2 in the axial direction on the opposite side of the plate 5 exposed. Therefore, the assembling work of a stator for permanent-magnet generator becomes simple, since no faucet joint section nor screw is required for fixing the base plate 5 to the core.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stator used for a magnet generator, and more particularly to a magnet having a base plate fixed to an armature core, the base plate being fixed to a predetermined stator mounting portion. The present invention relates to a generator stator.

[0002]

2. Description of the Related Art As a stator of a magnet generator which generates electric power by being driven by a prime mover such as an internal combustion engine, an electric machine having a large number (two or more) of salient pole portions projecting radially from an annular yoke portion An armature coil, an armature coil wound around a salient pole portion of the armature core via a bobbin, and a base plate disposed at one axial end of the armature core and fixed to the armature core. Some have been provided. This type of stator is fixed to the prime mover by fixing a base plate to a stator mounting portion provided on a case or a cover of the prime mover.

FIGS. 5 and 6 show an example of this type of conventional stator for a magnet generator. In these figures, 1
Is an armature core having a structure in which a large number (eight in the illustrated example) of salient pole portions 301 to 308 protrude radially from the annular yoke portion 2, and the salient pole portions 301 to 308 of the armature core.
Are mounted with resin bobbins 401 to 408 formed integrally with the iron core. The bobbins 401 to 408 cover the inner peripheral surface and the axial end surfaces of the yoke 2 of the armature core 1 and the outer peripheral surfaces of the magnetic poles formed at the respective tips of the salient poles 301 to 308. These bobbins 401-408
Armature coils 701 to 708 are wound respectively.

In order to fix the stator to a predetermined mounting portion,
A base plate 5 is attached to one end of the armature core 1 in the axial direction. The base plate 5 has a cylindrical boss 5A and a flange 5B provided at one end of the boss in the axial direction. The inner periphery of the other end of the boss 5A in the axial direction has a peripheral portion. A spigot portion 5a formed of an annular protrusion continuous in the direction is provided. A mounting hole 5 made of an arc-shaped long hole is formed in the flange 5B of the base plate.
b is formed.

[0005] The armature core 1 is disposed with the inner peripheral portion of the yoke portion 2 fitted in the spigot portion 5a of the base plate, and passes through three through holes 2a provided in the yoke portion 2 respectively. The armature core 1 and the base plate 5 are fastened by screws 8 screwed into screw holes of the boss portion 5A of the base plate.

[0006] In the magnet generator, a specific coil wound around at least one specific salient pole portion of the armature core is
It may be wound using a conductor having a smaller wire diameter than a coil wound around another salient pole. For example, in a magnet generator attached to an internal combustion engine, when an exciter coil for driving a capacitor discharge ignition device is provided, the exciter coil is required to induce a higher voltage than other coils, It is wound so as to have a larger number of turns than the other coils by using a conductor having a smaller wire diameter than the other coils. Thus, when winding a specific coil using a conductor having a smaller wire diameter than the other coils,
Since the winding of the specific coil and the winding of the other coil cannot be performed in the same process, the salient pole portion for winding the specific coil and the salient pole portion for winding the other coil are both provided. When the coil is integrated with the yoke, winding of the coil becomes very troublesome.

Therefore, in such a case, the end of the specific salient pole portion opposite to the magnetic pole portion is a dovetail-shaped end, and the dovetail-shaped end is fitted to the yoke. The specific salient pole portion is detachably attached to the yoke by fitting the dovetail-shaped end with the dovetail groove. As described above, when the specific salient pole portion is detachably attached to the yoke portion by dovetail connection, the coil is attached to the specific salient pole portion in a state where the specific salient pole portion is detached from the yoke portion. Can be easily performed, so that the stator can be manufactured efficiently.

[0008]

In the conventional stator for a magnet generator, in order to position the base plate and the armature core concentrically with each other, it is necessary to accurately provide the boss portion of the base plate with the spigot portion 5a. As a result, the processing of the base plate was troublesome and the cost was unavoidable.

Further, in the conventional stator for a magnet generator, since the armature iron core and the base plate have to be fastened with screws, there is also a problem that the assembly of the stator is troublesome.

Further, in the conventional stator, it is necessary to provide a hole for the screw 8 to pass through in the yoke portion 2 of the armature core, so that the radial size of the yoke portion 2 needs to be increased. There has been a problem that the outer diameter of the armature core becomes large.

SUMMARY OF THE INVENTION An object of the present invention is to provide a stator for a magnet generator in which it is not necessary to provide a spigot portion on a base plate and to perform a step of screwing the base plate to an armature core during assembly. It is in.

Another object of the present invention is to reduce the outer diameter of the armature core by reducing the radial dimension of the yoke portion of the armature core as compared with the prior art. To provide a stator for a vehicle.

[0013]

SUMMARY OF THE INVENTION The present invention provides an armature core having an annular yoke portion and a plurality of salient pole portions projecting radially from the yoke portion, and a salient pole portion of the armature iron core. A resin bobbin molded so as to be integral with the armature coil wound around the bobbin, and disposed at one axial end of the armature core and fixed to the armature core. And a base plate, wherein the base plate is fixed to a stator mounting portion of the magnet generator.

In the present invention, the base plate is formed of resin, and the base plate is formed integrally with the bobbin to form a bobbin base plate molded body.

A dovetail-shaped end is provided at at least one salient pole portion of the armature core, and the dovetail-shaped end is fitted into a dovetail groove provided in the yoke portion to thereby form the at least one salient pole. The salient pole portion is configured to be detachably attached to the yoke portion, and a coil wound around a bobbin provided on at least one detachable salient pole portion is provided on at least one detachable salient pole portion. If the coil with a large number of turns is wound using a conductor whose wire diameter is smaller than the conductor of the coil wound on the bobbin provided on the other salient pole portion, other than the detachable salient pole portion A bobbin and a base plate provided on all other salient pole portions are integrally formed of resin to form a bobbin base plate molded body. In this case, the bobbin base plate molded body is provided in a state where the portion of the armature core where the dovetail groove is provided is exposed.

[0016] With the above-described configuration, since the spigot portion and the screws are not required for positioning and fixing the armature core to the base plate, the assembly work of the stator is simplified. Also, with the above configuration, it is not necessary to provide a through hole for screw insertion in the yoke part, so that the radial dimension of the yoke part can be reduced and the outer diameter of the stator can be reduced,
The size of the magnet generator can be reduced.

[0017]

1 and 2 show an example of the construction of a stator for a magnet generator according to the present invention. FIG. 1 is a front view, and FIG. 2 is a sectional view taken along line YY of FIG. It is. In these figures, reference numeral 1 denotes an armature core formed by laminating iron plates of a predetermined shape. The armature core has a large number (two or more, 8 in the illustrated example) projecting radially from the annular yoke portion 2. Pieces) salient pole part 3
Magnetic pole portions 301a to 308a are formed at the radially outer ends of the salient pole portions so as to face the magnetic poles of a magnet rotor (not shown).

Reference numerals 401 to 408 denote bobbins provided on the respective coil winding portions (coils are wound) of the salient pole portions 301 to 308.
Reference numeral 8 denotes a salient pole in a state where at least the outer peripheral surfaces (surfaces facing the magnetic poles of the magnet rotor) of the magnetic pole portions 301a to 308a formed at radially outer ends of the salient pole portions 301 to 308 are exposed. It is formed so as to be integral with each of the pole portions 301 to 308 (in a state where the salient pole portions 301 to 308 are cast, respectively).

Reference numeral 5 denotes a base plate used for mounting the armature core on the stator mounting portion of the magnet generator.
The base plate 5 has a cylindrical boss 501 provided so as to protrude in the axial direction from one end side in the axial direction of the armature core while sharing the central axis with the armature core 1.
And a disk-shaped flange 502 formed at one end of the boss 501.

In the present invention, the base plate 5 is formed of resin, and the base plate 5 is formed so as to be integral with the bobbins 401 to 408 to form the bobbin base plate molded body 6. The armature core 1 has a predetermined portion embedded in the molded body 6 and is integrated with the molded body 6. In this case, the magnetic pole portion 301a of the armature core 1
308a are exposed at least on the outer peripheral surface. Further, it is preferable to expose most of the axial end surface of the yoke portion 2 opposite to the base plate 5 (the portion indicated by reference numeral A in FIG. 1). As described above, in order to integrate the armature core 1 and the bobbin base plate molded body 6, in a state where the armature core 1 is positioned in the molding die of the bobbin base plate molded body 6, the resin is inserted into the mold. Should be injected.

As described above, if most of the axial end surface of the yoke portion 2 of the armature core 1 opposite to the base plate 5 is exposed, heat radiation from the iron core can be improved.

The resin forming the bobbin base plate molded body 6 may be any resin having the necessary dielectric strength and mechanical strength, but the base plate 5 may be used at a high temperature such as a crankcase of an internal combustion engine. When it is attached to a place where vibration is large, as a resin forming the molded body 6,
It is preferable to use a high-strength resin having excellent heat resistance and vibration damping properties. As a high-strength resin excellent in heat resistance and vibration damping properties, for example, PPS (polyphenylene sulfide)
It is appropriate to use a resin.

The armature coils 70 are connected to the salient pole portions 301 to 308 of the armature core via bobbins 401 to 408, respectively.
1 to 708 are wound. These armature coils 7
01 to 708 are power generation coils for a low-voltage power supply used for lighting a lamp and charging a battery, each of which is wound by a conductor having the same wire diameter. Armature coil 7
01 to 708 are appropriately connected (in series or in parallel, or in series / parallel) and connected to a load through a wire harness (not shown).

The flange portion 502 formed on the base plate 5 of the bobbin base plate molded body 6 has three mounting holes 502a, each of which has an arc-shaped long hole whose center coincides with the center of the stator, is 120 degrees. Are provided at intervals.

In the illustrated stator, the rotating shaft of the prime mover is arranged concentrically inside the boss 501 of the base plate 5, and the flange portion 502 of the base plate is brought into contact with a stator mounting portion (not shown). A screw (not shown) that is arranged and penetrates through each mounting hole 502a is screwed into a screw hole provided in the stator mounting portion, thereby being fixed to the stator mounting portion.

The stator mounting portion is provided on the side of the prime mover that drives the magnet generator, and is fitted to the outer or inner circumference of the base plate 5 to position the stator concentrically with the rotating shaft. Part), and a screw hole for screwing a screw through the mounting hole 502a of the base plate. When an internal combustion engine is used as a prime mover for driving a magnet generator, the stator mounting portion is provided on a crankcase or a cover of the internal combustion engine.

Outside the armature core 1, salient pole portions 301 to
A flywheel magnet rotor (not shown) having a magnetic pole facing the magnetic pole portion 308 via a predetermined gap is arranged, and the magnet rotor and the above-described stator constitute a magnet generator.

When the stator mounting portion for mounting the stator is provided at a location where vibration is generated, such as a case or a cover of an internal combustion engine, the vibration is transmitted to the coil through the armature core. If the amplitude of this vibration is large, the coil conductor may be disconnected. In the present invention, since the armature core is fixed to the stator mounting portion through the bobbin base plate molded body made of resin, vibration generated on the stator mounting portion side is absorbed by the resin constituting the bobbin base plate molded body. Attenuated. Therefore,
The amplitude of the vibration transmitted to the coil can be reduced, and the possibility that the coil conductor is disconnected due to the vibration can be eliminated.

FIGS. 3 and 4 show another example of the configuration of the stator for a magnet generator according to the present invention. In this example, the stator protrudes radially from an annular yoke 2 of an armature core. Numerous (eight in the illustrated example) salient pole portions 301 to 307 and 30
8 ′, one salient pole 308 ′ is detachably attached to the yoke 2.

In this example, the end 308b 'of the salient pole 308' on the side of the yoke 2 is formed in a dovetail shape.
A dovetail groove 2b into which the dovetail-shaped end 308b 'of the salient pole 308' is fitted is formed. The salient pole 308 'is formed by pressing the dovetail-shaped end 308b' into the dovetail groove 2b.
Mounted on The salient pole portion 308 ′ includes the salient pole portion 3
There is provided a bobbin 408 'molded so as to be integral with the 08'.

The bobbins 4 provided on all the other salient pole portions 301 to 307 except the detachable salient pole portions 308 '
1 to 407 and the base plate 5 are integrally formed of resin in the same manner as in the example shown in FIG. Salient pole 3 of armature core 1
The parts other than the part 08 ′ are provided with the dovetail groove 2b, the outer peripheral surfaces of the magnetic pole parts 301a to 307a, and most of the axial end face of the yoke part 2 opposite to the base plate in the axial direction (A in FIG. 3). ) Is exposed in the bobbin base plate molded body 6 and integrated with the molded body. Armature coils 701 to 707 are wound around salient pole portions 301 to 307 of the armature core 1 embedded in the bobbin base plate molded body 6 via bobbins 401 to 407 provided in the molded body 6, respectively. I have. These armature coils 701 to 707 are appropriately connected and connected to a lighting load, a battery charging circuit, and the like.

A coil 708 'having a smaller wire diameter and a larger number of turns than the coils wound around the other salient poles is wound around the bobbin 408' provided on the detachable salient pole 308 '. Have been. The coil 708 'is an exciter coil used for charging an ignition energy storage capacitor of a capacitor discharge ignition device, for example. To facilitate the winding operation, the coil 708 ′ is
′ Is removed from the yoke and wound around the coil 70.
After winding 8 ′, the salient pole 308 ′ is attached to the yoke 2.

In the example shown in FIGS. 3 and 4, only one detachable salient pole portion is provided. However, if necessary, a plurality of detachable salient pole portions (for example, two) are provided. A coil having a smaller wire diameter and a larger number of turns than the coils wound around the other salient pole portions may be wound around the detachable salient pole portions.

For example, the exciter coil of the capacitor discharge ignition device is divided into two detachable salient pole portions and wound,
After attaching the two salient poles to the yoke, the coils wound around the two salient poles are connected in series to form one exciter coil. In addition, a high-speed exciter coil with a small number of turns (a coil that induces a high voltage at a high speed of the internal combustion engine) and a low-speed exciter coil with a large number of turns (a high voltage is induced at a low speed of the engine) are provided in the capacitor discharge ignition circuit. In the case where two coils are provided, high-speed and low-speed exciter coils can be wound around the two detachable salient pole portions, respectively.

In the above example, eight salient pole portions are provided so as to protrude radially from the annular yoke portion 2 of the armature core. However, in the present invention, it is sufficient that the number of salient pole portions is two or more. , The number is arbitrary.

In the above example, the coils are wound around all the salient pole portions. However, depending on the magnitude of the output required for the magnet generator, the bobbins provided on some salient pole portions may be provided. An empty bobbin in which the coil is not wound may be used.

[0037]

As described above, according to the present invention, the bobbin provided on each salient pole portion of the armature core having a plurality of salient pole portions projecting radially from the annular yoke portion, Since the bobbin base plate molded body was formed by integrally molding the base plate fixed to the iron core with the resin,
There is no need to provide holes for screws to penetrate the yoke of the armature core. Therefore, the outer diameter of the stator can be reduced by reducing the radial dimension of the yoke portion, and the size of the magnet generator can be reduced.

Further, according to the present invention, there is no need to provide a spigot portion (positioning portion) between the armature core and the base plate, or to fasten the armature core and the base plate with screws. Can be simplified, and the assembly work of the stator can be simplified.

Further, in the present invention, since the armature core is mounted on the predetermined mounting portion via the bobbin base plate formed of resin, when the stator is mounted on the mounting portion with high vibration, the formed body is Can absorb high-frequency micro-vibration by the resin that forms the armature coil, and can eliminate the possibility that the conductor forming the armature coil is disconnected due to the vibration.

[Brief description of the drawings]

FIG. 1 is a front view showing a configuration example of a stator for a magnet generator according to the present invention.

FIG. 2 is a sectional view taken along line YY of FIG.

FIG. 3 is a front view showing another configuration example of the stator for the magnet generator according to the present invention.

FIG. 4 is a sectional view taken along line YY of FIG. 3;

FIG. 5 is a front view showing a conventional example.

FIG. 6 is a sectional view taken along line YY of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Armature core 2 Yoke part 2a Mounting hole 2b Dovetail 301-308 Salient pole part 308 'Removable salient pole part 308'b Pigtail-shaped end part 401-408 Bobbin 408' Bobbin 5 Base plate 6 Bobbin base plate molded object 701 ~ 708 armature coil 708 'armature coil

Claims (2)

[Claims] 1. An armature core having an annular yoke portion and a plurality of salient pole portions projecting radially from the yoke portion, and formed so as to be integral with the salient pole portions of the armature iron core. Resin bobbin, and an armature coil wound around the bobbin,
A base plate disposed at one end of the armature core in the axial direction and fixed to the armature core, wherein the base plate is fixed to a stator mounting portion of the magnet generator. Wherein the base plate is made of resin, and the base plate and the bobbin are formed so as to be integrated with each other to form a bobbin base plate molded body. 2. An armature core having an annular yoke portion and a plurality of salient pole portions radially protruding from the yoke portion, and formed so as to be integral with the salient pole portions of the armature core. Resin bobbin, and an armature coil wound around the bobbin,
A base plate disposed at one axial end of the armature core and fixed to the armature core, wherein at least one salient pole of the armature core has a dovetail-shaped end. The dovetail-shaped end is fitted in a dovetail groove provided in the yoke portion and is detachably attached to the yoke portion. The bobbin provided in the detachable salient pole portion has another protrusion. A coil having a larger number of turns than a coil wound around a bobbin provided at the pole portion is wound using a conductor having a smaller wire diameter than a conductor wound around a bobbin provided at another salient pole portion. In the stator for a magnetic generator in which the base plate is fixed to a stator mounting portion of the magnet generator, the base plate is made of resin, and the base plate is all other than the detachable salient pole portion. With the bobbin provided in the salient pole part of The magnet is characterized in that the bobbin base plate molded body is formed in such a manner that the portion where the dovetail groove of the armature core is provided is exposed. Stator for generator.