JP3144157B2 - Stator of magnet generator for internal combustion engine - Google Patents

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 magnet generator for an internal combustion engine.

[0002]

2. Description of the Related Art In a magnet generator which is attached to an internal combustion engine and supplies electric power for ignition power, lighting, charging, etc. of the engine, a large number of projecting parts are formed from an annular yoke in order to achieve a small and high output. A multi-pole stator including an armature core having protruding pole portions and a plurality of armature coils wound around a plurality of salient pole portions of the armature core is often used.

When a plurality of armature coils are electrically connected in series in a stator of this type and are used, usually, the armature coils are continuously wound around a plurality of salient pole portions so that adjacent armature coils are used. A configuration is adopted in which the coils are connected by a crossover. In this case, the crossover connecting the plurality of armature coils is arranged along the outer surface of the yoke portion of the armature core, and is insulated and fixed to the core by appropriate means.

FIG. 2 shows a cross section of a crossover portion of a conventional stator of this type. An insulating resin coating 4 is provided so as to cover the outer surface of a yoke portion 101. The crossover 3 is arranged on the upper side. A resin coating 6 is further formed so as to cover the crossover 3 and the insulating resin coating 4, and the resin coating 6 is bonded to the crossover 3 and the insulating resin coating 4.

[0005]

In a magnet generator mounted on an internal combustion engine, the temperature of the generator rises due to the heat generated by the generator coil and the heat generated by the engine during operation, and the heat source is removed when the generator is stopped. Therefore, the generator is cooled. Therefore, the stator of the generator is subjected to a heat cycle of heating and cooling, and when the cooling cycle is repeated, cracks are formed in the insulating resin coating 4 of the armature core and the resin coating 6 covering the crossover wires. May occur.

In the conventional stator, since the resin coating 6 covering the connecting wire 3 is bonded to the connecting wire 3, when the resin coating 6 is cracked, a large stress is applied to the connecting wire 3 so that the connecting wire 3 may be damaged. There was a risk of disconnection.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnet for an internal combustion engine which prevents breakage of a crossover due to a cooling and heating cycle by preventing a large stress from being applied to the crossover even if a crack occurs in an insulating layer covering the crossover. An object of the present invention is to provide a generator stator.

[0008]

According to the present invention, there is provided an armature core formed by projecting a number of salient pole portions from an annular yoke portion, and a plurality of salient pole portions of the armature core wound respectively. The present invention relates to a stator of a magnet generator for an internal combustion engine including a plurality of armature coils connected in series via a crossover.

[0009] In the present invention, the connecting wire is disposed on the first insulating layer provided so as to cover the outer surface of the yoke portion, and the connecting wire is placed on the first insulating layer. A second insulating layer that covers the first insulating layer is formed, and a third insulating layer that covers the first insulating layer together with the second insulating layer is formed.
Here, the second insulating layer is formed of an insulating material that does not adhere to the first and third insulating layers, or an insulating material that has a low adhesive strength to the first and third insulating layers.

[0010]

As described above, the second insulating layer is provided so as to cover the connecting wires arranged on the first insulating layer, and the third insulating layer covering the first insulating layer together with the second insulating layer is provided. When the second insulating layer is formed of an insulating material that does not adhere to the first and third insulating layers, or an insulating material that has a weak adhesive force to the first and third insulating layers, the thermal cycle When a crack occurs in the first insulating layer or the third insulating layer, a relative slip occurs between the first insulating layer or the third insulating layer and the second insulating layer, and the crossover wire is formed. Since a large stress can be prevented from being applied to the wire, the risk of breakage of the crossover can be eliminated, and the reliability can be improved.

[0011]

FIG. 1A shows an embodiment of a stator of a magnet generator for an internal combustion engine according to the present invention.
Is an armature iron core made of a laminated body of steel plates, and 2a to 2e are a plurality (five in this embodiment) of armature coils connected in series via crossover wires 3a to 3d. The stator and a magnet rotor (not shown) rotating outside the stator constitute a multi-pole magnet generator.

The armature core 1 is composed of a large number (12 in this embodiment) of salient pole portions 102a to 102
It has a structure that radially protrudes 02l, and a magnetic pole portion facing a magnetic pole of a magnet rotor (not shown) is formed at the tip of each salient pole portion. A screw (not shown) for attaching the armature core 1 to the engine is provided on the yoke portion 101.
Are provided.

The outer surface of the salient pole portion of the armature core 1 except for the outer peripheral surface of the magnetic pole portion and the outer surface of the portion near the outer periphery of the yoke portion 101 have an armature coil and a crossover wire with respect to the iron core. For insulation, a first insulating layer 4 made of an insulating resin coating is formed. The first insulating layer 4 is made of, for example, a powder epoxy resin (for example, product name F20 manufactured by Somar Industries).
It can be formed by a fluid immersion method (a method in which a powder is spread on a heated iron core and melted and attached) using 6).
In this case, masking is applied to a portion where the resin is not desired to adhere.

In this embodiment, the five armature coils 2a to 2e are respectively provided with salient pole portions 102a, 102
2c, 102f and 102i. These armature coils are connected to 2a while crossing the connecting wires 3a to 3d.
→ 2b → 2c → 2d → 2e, and the armature coils 2a to 2e are connected in series by connecting wires 3a to 3d. The winding start 2a1 of the armature coil 2a and the winding end 2e2 of the armature coil 2e are respectively drawn through insulating tubes. Crossover 3a to 3d
Is arranged along the first insulating layer 4 provided so as to cover the outer surface of the portion near the outer periphery of the yoke part 101.

After the winding of the armature coils 2a to 2e is completed, a second insulating layer covering the connecting wires 3a to 3d is formed, and a third insulating layer covering the first insulating layer together with the second insulating layer is formed. Is formed.

FIG. 1B shows a cross section of the stator near the crossover line. Although the figure shows the vicinity of the crossover 3a, the structure of the other crossovers is exactly the same. In FIG. 1B, reference numeral 5 denotes a second insulating layer that covers the connecting wires 3a disposed on the first insulating layer 4 that covers the outer surface of the yoke portion 101, and 6 denotes the first insulating layer. This is a third insulating layer covering the layer 4 together with the second insulating layer 5. The third insulating layer 6 is bonded to the first insulating layer 4 at a portion where the second insulating layer 5 is not provided.

The second insulating layer 5 is made of an insulating material which does not adhere to the resin forming the first insulating layer 4 and the resin forming the third insulating layer, or the resin forming the first insulating layer 4 and the resin forming the first insulating layer 4. The third insulating layer 6 is formed by applying a resin (for example, Nittol 120C under the trade name) having low adhesive strength to the resin forming the insulating layer 6 by brushing or the like.

The second insulating layer 5 can also be formed by a method of dipping the stator in a dipping layer containing a resin solution (dipping method). In this case, the second insulating layer 5 can be formed so as to cover the outer surface of the armature coil as well as the portion where the crossover wires of the armature core are arranged.

The third insulating layer 6 is formed so as to cover both the first insulating layer 4 and the second insulating layer 5 with, for example, an epoxy resin (for example, F246 of Somar Industries). When the second insulating layer is formed so as to cover the outer surface of the armature coil, the third insulating layer is also formed on the second insulating layer covering the outer surface of the armature coil.

When the second insulating layer 5 is formed so as to cover also the armature coil, a third insulating layer is formed also on the second insulating layer covering the armature coil. By doing so, the armature coil can be protected.

As described above, the connecting wires 3a to 3d arranged alongside the first insulating layer 4 are covered with the second insulating layer 5, and the first insulating layer 4 is covered with the second insulating layer. When the third insulating layer 6 covering with the first and third insulating layers 4 and 6 is formed by using an insulating material that does not adhere to the first and third insulating layers 4 and 6 or has a weak adhesive force, When a crack occurs in the first insulating layer 4 or the third insulating layer 6 due to the repetition of the cycle, a relative slip occurs between the cracked portion and the second insulating layer 5, It is possible to prevent a large stress from being applied to the crossover.

In the above embodiment, the armature core has twelve salient pole portions radially protruding from the annular yoke portion.
An armature coil is wound around each of five salient pole portions of the two salient pole portions, and each armature coil is connected in series via a connecting wire. It has two or more (usually four or more) salient poles protruding from the yoke, and armature coils are wound around all or at least two salient poles, respectively. The present invention can be applied to a stator of a magnet generator for an internal combustion engine in which at least two armature coils among the armature coils are connected in series via a connecting wire.

[0023]

As described above, according to the present invention, the crossover connecting the armature coils is formed on the first insulating layer provided so as to cover the outer surface of the yoke of the armature core. To form a second insulating layer that covers the connecting wire, forms a third insulating layer that covers both the first and second insulating layers, and forms a second insulating layer. , The first and third insulating layers are not adhered to each other, or are formed of an insulating material having a weak adhesive force to the first and third insulating layers. When a crack occurs in the layer or the third insulating layer, it is possible to eliminate a possibility that a large stress is applied to the crossover and the crossover is disconnected. Accordingly, it is possible to provide a high-stability and high-quality stator for a magnet generator for an internal combustion engine.

[Brief description of the drawings]

FIG. 1A is a front view showing an embodiment of the present invention. FIG. 4B is an enlarged cross-sectional view showing a cross section of a crossover portion in the example.

FIG. 2 is a cross-sectional view showing a cross section of a crossover portion of a conventional stator.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 armature core 101 yoke portion 102 a to 102 l salient pole portion 2 a to 2 e armature coil 3 a to 3 d crossover 4 first insulating layer 5 second insulating layer 6 third insulating layer

Claims (1)

(57) [Claims] 1. An armature core having a number of salient pole portions projecting from an annular yoke portion, and wound around a plurality of salient pole portions of the armature core and connected in series via a connecting wire. And a plurality of armature coils provided in the stator of the magnet generator for an internal combustion engine, wherein the connecting wire is attached to a first insulating layer provided so as to cover an outer surface of the yoke. A second insulating layer that covers the connecting wires is formed on the first insulating layer, and a third insulating layer that covers the first insulating layer together with the second insulating layer Is formed, and the second insulating layer is made of an insulating material that does not adhere to the first and third insulating layers, or an insulating material that has a weak adhesive force with the first and third insulating layers. A stator for a magnet generator for an internal combustion engine.