JPS6012867B2 - Direct current machine armature manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a DC machine armature, which improves the resin impregnation method to improve strength against electrical and mechanical stress.

Coils for transformers, electric motors, etc. are impregnated with resin in order to improve breakdown voltage, mechanical strength, green resistance, etc.

This resin used to be a solvent type resin, but in recent years, solvent-free types such as epoxy and polyimide are mainly used.
In large electric machines, only the coil is impregnated and then set on the iron core, but in small machines, after the coil is set on the iron core, the whole is placed in an impregnation tank and immersed in the same tank. According to the former method of assembly after impregnation, there is a risk that the coil will be damaged during the assembly operation. Further, it tends to be insufficiently fixed to the iron D', and has the disadvantage of being susceptible to mechanical and electromagnetic stress during operation. On the other hand, according to the latter post-assembly impregnation method, the resin is evenly impregnated into secret parts such as the mutual connection parts of the coils. There is no coil processing after impregnation, so no damage will occur. moreover,
Resin is also inserted between the iron core and the coil to create a strong bond.
For these reasons, the coils and cores of electrical machines are preferably impregnated with resin after assembly. This also applies to DC rotating machines. The armature of a DC machine has dozens of coils housed in iron D and has a commutator.

This must rotate from low speeds to high speeds while withstanding large mechanical forces. Green resistance and dust resistance are also required,
For this purpose, it is best to soak it in the house after assembly. To further increase reliability, it is recommended to fill the gaps at the coil ends with resin.
A method called casting is generally used to manufacture such resin-filled monolithic electric machines. Casting is usually a process in which the equipment is placed in a metal container and resin is filled between the container, the wall and the equipment, and in the details of the equipment, with a resin layer 5 to 1 m thick around the outside of the equipment. is formed. The armature of a DC machine has a shaft, commutator, etc., and resin must not be applied to this surface. Furthermore, since the surface of the iron core forms a magnetic path with the field pole, no resin layer should be formed there either. The present invention provides a method for manufacturing a DC mine isogo in which the impregnated resin does not adhere to the surfaces of the shaft, commutator, iron core, etc., and the coil and the iron core are sufficiently integrally impregnated with the solvent-free resin. The purpose is to

An embodiment of the present invention will be described below with reference to the drawings.

The armature of a DC machine has a shaft 1, an iron core 2, and armature arms 3 and 4.
and a commutator 5 are installed.

A coil 6 is housed in a slot (not shown) of the iron core 2,
It is connected to the commutator 5 by a riser 7. In the case of large-sized DC motors, when viewed from the shaft direction (that is, from the direction of the etc., this area is filled with the conductors of the riser 7 and insulating plates that isolate them one by one, forming an integrated disk. It is assumed that the armature 8 is blocked even if it is not blocked.Then, a film is wrapped around the outer periphery of the armature 8 to form the inner cylinder 8, and a film is wrapped around the outer periphery of the iron core 2, the coil 6, and the commutator 5. are wound to form outer cylinders 9 and 10, and this inner cylinder 8 and outer cylinder 9
The resin is injected in between. This is actually done as follows. The iron core 2 is treated with varnish in advance, and small gaps between the laminated layers are filled with resin. This is attached to the shaft, and the almost cylindrical armature bodies 3 and 4 are
hold it down. Furthermore, a commutator 5 is attached. When applying the steel insulation 11 on the armature shell 3 on the side opposite to the commutator, a film is sandwiched and wound between them to form the inner cylinder 8. The end of the film in the inner tube 8 is sealed with adhesive. Next, the coil 6 is placed in the core slot, and the outlet is connected to the riser 7 by soldering or welding. A gap is created between the outer slots of the coil 6, and this space is filled with glass wool, short cut glass string, or a filling material (not shown) made of a fibrous material such as asbestos. A glass tape with a thickness of 0.1 to 0.25 is wrapped once or twice over the coil end portion in a half-fold manner to form the glass tape layer 12.In this state, the glass tape layer 12 is formed at 100 to 12 and 0. Dry for 1 hour. Remove from the drying oven and while still warm, wrap a film wide enough to cover from the riser 7 to the coil loop portion 13 to form the first outer cylinder 9. This outer cylinder 9 The ends of the film are also sealed past the adhesive. In order to hold down this first outer cylinder 9, semi-hard varnished presser tape 14 is wrapped around it in several places.
This holding tape 14 is fused by the heat of the armature and will not come off. Furthermore, a film is wound around the commutator 5 to form a second outer cylinder 10. This outer cylinder 10
There is no need to glue the ends of the film. This second outer cylinder 10 is also fixed with a presser tape 15 treated with semi-hard Hibushi varnish. Note that the first outer cylinder 9 and the second outer cylinder may be constructed as one body. The structure thus constructed as shown in the attached drawings was placed in an impregnating tank in an upright position with the five commutators facing down, and degassed. After that, the solvent-free resin is injected from above, that is, between the inner tube 8 and the first outer tube 9 of the coil loop portion 13. The resin is filled sequentially from the connection part of the riser 7 at the bottom, and when it reaches the loop part 13, the injection is stopped, and the vacuum is then continued for some time to sufficiently degas it.Next, atmospheric air is introduced into the impregnation tank. Pressurize to 4 to 5 atmospheres. After leaving it for a while, move it to a drying oven and heat to harden the resin. Then, remove the inner cylinder 8, presser tapes 14, 15, and outer cylinders 9, 10. The tape layer 12 is impregnated with resin, which is also removed as much as possible. After that, the upper and lower coil ends are wrapped with pinned tape and heat treated to complete the armature. The impregnated resin is applied to the core slot closing part. (not shown), but this will be removed in a later finishing process.With this method, the core slots and armature shell can be removed without violating the basic requirement of not increasing the armature outer diameter. 3, 4, the area surrounded by the riser 7 and the armature surface is all filled with resin.

The ground insulation of the coil 6 and the armature ear insulation 11 are also sufficiently impregnated with the resin. . Even the fairly large gaps between the coils 6 are filled with resin. Large resin puddles normally cause cracks, but in the case of this method, this is prevented because a reinforcing material such as glass fiber or asbestos is included as a filler. Since all parts are bonded with resin, it is not only resistant to vibration and shock, but also has no passageway for moisture or dust to enter. Moreover, when the impregnating resin is injected, the resin becomes droplets and easily scatters, but because of the presence of the second outer cylinder 10, it does not adhere to the surface of the commutator 5. In a DC machine such as a main electric motor for a vehicle, the armature coppers 3 and 4 and the iron core 2 are provided with ventilation holes in the axial direction. In addition, the relationship between the axial protrusion lengths of the coil loop portion 13 on the anti-commutator side, the shell insulation 11, and the armature shell 3 is generally as shown in the figure, due to creepage insulation and material strength constraints. is the most prominent form. In this embodiment, this coil loop portion 13
Since the inner tube 8 is provided with a sufficiently longer protrusion length than the inner tube 8, the impregnated resin can be injected between the inner tube 8 and the outer tube 9 to a level where the coil loop portion 13 is sufficiently submerged. As the impregnated resin enters the voids around the coil and in the slot, the resin liquid level gradually decreases, but even at this time the coil roof. Since a sufficient amount of impregnated resin can be maintained around the portion 13, the coil loop portion 13 is also sufficiently impregnated with the resin. Further, even in this case, since the impregnated resin is blocked by the inner cylinder 8, there is no possibility that the impregnated resin will enter the above-mentioned ventilation hole and impede cooling. As described above, according to the present invention, a film is wrapped in a cylindrical shape from the coil loop portion 13 to the commutator 5 to form an outer cylinder, and the film is wrapped in a shape extending from the end of the armature cage 3 on the side opposite to the commutator. A cylinder is attached to form the inner cylinder 8, and resin is injected between the outer cylinder 9 and the inner cylinder 8 with the commutator 5 facing downward and hardened, so that almost no resin adheres to unnecessary parts. Moreover, the required portions are sufficiently filled with resin.

Moreover, since the gaps between the coil outlet and the curved part are filled with a fibrous material filling material for reinforcement, there is no need to worry about cracks caused by resin accumulation, and the DC machine armature can be manufactured without repair or failure with high productivity. Can be manufactured.

[Brief explanation of drawings]

The accompanying drawing is a half-sectional elevational view showing an armature being manufactured in an embodiment of the method for manufacturing a DC machine armature according to the present invention. 2. ．． ．． Iron core, 5... Commutator, 6... Coil, 7...
Riser, 8...inner cylinder, 9, 10...outer cylinder.

Claims (1)

[Claims] 1 The coil is housed in the core slot, the coil end on the opposite side of the commutator is supported by a nearly cylindrical armature body, the coil outlet is connected to the riser of the commutator, and the coil and core are impregnated with resin together. In a method for manufacturing a DC machine armature, an inner cylinder is formed by wrapping a film between the armature body on the side opposite to the commutator and the coil end in a substantially cylindrical shape protruding from the coil end, and forming an inner cylinder between the coil outlet and the coil end. A filler made of fibrous material is filled into the gap between the curved parts, a glass tape is wrapped around the outer periphery, and a film is wrapped in a cylindrical shape from a protruding position such as the coil loop part at the tip of the coil end to the commutator to form an outer cylinder. A method for manufacturing a DC machine armature, which comprises: standing the armature upright with the commutator facing downward; and injecting and curing resin between the inner cylinder and the outer cylinder.