JPS61251450A - Rotor of rotary electric machine - Google Patents

Abstract

PURPOSE:To prevent an insulation from decreasing by forming a tapered shape so that a coil conductor side reduces in diameter when forming a vent hole in an insulating spacer interposed between a coil conductor and a wedge, thereby eliminating the adherence of a copper dust. CONSTITUTION:Coil conductors 4 are laminated in a slot, and a wedge 6 is mounted in the slot through an insulating spacer 5A. Vent holes 9, 10A, 11 which are directed radially of a rotor are respectively formed at the conductors 4, the spacer 5A and the wedge 6. In this case, the hole 9 formed at the spacer 5A has a small diameter at the conductor 4 side, and is formed in a tapered shape having a large diameter at the wedge 6 side. Thus, since no step is formed at the vent holes, copper dusts are not adhered, but the insulating strength of the spacer 5A can be held.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to a rotor for a rotating electric machine.

[Background of the invention]

FIG. 2 shows a conventional example of a rotor for a rotating electric machine.

As shown in the figure, a slot 2 is cut in the rotor core 1, a slot insulation 3 is laid in this slot, a coil conductor 4 is inserted, and a wedge 6 is inserted through an insulating spacer 5. There is. The wedge 6 is a coil conductor 4 due to centrifugal force.
The slot insulator 3 and the insulating spacer 5 are used to insulate the wedge 6 from the slot wall. The coil conductor 4 (including the interconductor insulation 7), the insulating spacer 5 and the wedge 6 are each provided with a series of ventilation holes 9, 10 and 11 that communicate with the ventilation groove 8 provided in the shut. ventilation hole 9,
10.11 is cooled by passing hydrogen directly through it.

In the rotor constructed in this way, there is a mechanical distance of 21! between the coil conductor 4 and the slot 2! J, and the coil conductors 4 mutually press each other to fill this gap, so a small amount of copper powder comes out. Further, when the steel coil conductor 4 is strongly pressed against the slot insulation 3 made of a glass base insulator due to thermal deformation, copper dust is generated. When this steel dust and copper powder adhere to the insulating spacer 5 due to centrifugal force, electrical JI! !
This dust, #1 dust, usually enters between the slot insulation 3 and the coil conductor 4 on the side of the slot, and the dust passes through the first ventilation hole 10. are blown away by centrifugal force and gather on the side of the
The latter is attached to the side surface of the ventilation hole IO of the insulating spacer 5.

By the way, the insulating strength of the insulating spacer 5 is determined by the distance a between the surface facing the slot insulator 3 on the side surface and the pole direction distance of the ventilation hole 10 part, which already secures the creepage distance between ground and the distance a part. The influence of steel dust and copper powder is eliminated by filling the space between the bottom corner of the slot insulation 3 side of the insulation spacer 5 and the opposite corner of the coil conductor 40 with a filler 12. However, in the conventional insulating spacer 5, copper dust and copper powder tend to adhere to the parallel ventilation holes 1G, and the creeping resistance of this portion, that is, the radially distant portion decreases, resulting in a decrease in insulation strength. Regarding this, there is Japanese Patent Application Laid-open No. 57-75543.

[Purpose of the invention]

The present invention has been made in view of the above points.

The object of the present invention is to provide a rotor cup for a rotating LC rock that can prevent copper dust from adhering and maintain the insulating strength of an insulating spacer.

[Summary of the invention]

That is, the present invention provides a rotor core having slots provided at predetermined intervals in the circumferential direction, having openings at *m, and extending in the axial direction, and laminated in the slots of the rotor core. A coil conductor, a slot insulation provided between the four coils and the slot, and an insulating spacer provided between the wedge attached to the opening of the slot and the coil conductor, A filling material is filled between the bottom corner of the slot insulation side of the insulating spacer and the corner of the coil conductor opposing thereto, and the coil body, the insulating spacer, and the wedge are each provided on the shaft. In a rotor of a rotating electric machine provided with a series of ventilation holes communicating with ventilation grooves, the ventilation holes of the insulating spacer are arranged such that the diameter on the coil conductor side is smaller than the diameter on the wedge side, and the diameter on the wedge side is smaller than the diameter on the wedge side. before d
This means that the diameter of the insulating spacer ventilation hole is larger than that of the picoil conductor side6), so that the diameter of the insulating spacer ventilation hole is smaller than that of the wedge side, and the diameter of the wedge side is smaller than the diameter of the wedge side. It comes to be formed larger than the one on the side.

[@Ming Example]

The present invention will be explained below based on the illustrated embodiments. FIG. 1 shows an embodiment of the present invention. Note that parts that are the same as those in the prior art are designated by the same reference numerals, and their explanations will be omitted. In the example illustrated by Hono, the ventilation hole 10A' of the insulating spacer 5A? , Wedge 61i1 with 4 coils 4g4! The diameter of the wedge 6 is smaller than the diameter of I, and the diameter of the wedge 6 is larger than that of the coil conductor 4 side. In this way, use a rainbow insulating spacer 5A.
The diameter of the ventilation hole lOA on the coil conductor 4 side is smaller than the diameter on the wedge 6 side, and the diameter on the wedge 6 side is larger than the diameter on the coil conductor 4 side, thereby preventing the adhesion of copper dust. Thus, it is possible to obtain a rotor for a rotating electrical machine that can maintain the insulation strength of the insulating spacer 5A.

That is, the diameter of the ventilation hole 10A of the insulating spacer 5A is made smaller on the coil conductor 4 side than the diameter on the wedge 6 side, so that the diameter on the coil conductor 4 side almost matches the diameter of the ventilation hole 9 of the coil conductor 4. , the diameter on the wedge 6 side is made larger than the diameter on the coil conductor 4 side so that the diameter on the wedge 6 side almost matches the diameter of the ventilation hole 11 of the wedge 6. Is it possible to insulate the space in this way? The ventilation hole 10A of the coil conductor 4 is formed so that the diameter on the wedge 6 side is larger than the diameter on the coil conductor 4 side, so that the copper dust and copper powder from the ventilation hole 9 of the coil conductor 4 are directly transferred to the ventilation of the insulating spacer 5A. Hole 10A
through the wedge 60 to reach the ventilation hole 11,
Copper dust and copper powder can be prevented from adhering to the side surface of the ventilation hole 10A of the insulating spacer 5A, the creeping resistance of the ventilation hole 10A portion can be maintained, and the insulation strength of the insulating spacer 5A can be maintained.

〔Effect of the invention〕

As described above, the present invention prevents the adhesion of steel dust and maintains the insulating strength of the insulating spacer, and prevents the adhesion of copper dust and maintains the insulating strength of the insulating spacer. You can get a rotor for an electric machine.

[Brief explanation of the drawing]

Figure 24141 is a cross-sectional view of the area around the insulating spacer of an embodiment of the rotor of the rotating electric machine of the present invention, and figure 24141 is a cross-sectional view of the slot portion of the rotor of 11 conventional rotary machines. l...Rotor core, 2...Slot %3...Slot insulation, 4...Coil conductor, 5A...Insulation spacer, 6...Wedge, 7...Insulation between conductors, 8 ...
Ventilation groove, 9...Ventilation hole of coil conductor, IOA...Ventilation of insulating spacer (1 other person) Dormitory 1 Figure 2 Field

Claims (1)

[Claims] 1. A rotor core having slots provided at predetermined intervals in the circumferential direction, having openings on the surface, and extending in the axial direction, and coil conductors laminated within the slots of the rotor core. , a slot insulation provided between the coil conductor and the slot, and an insulating spacer provided between the wedge attached to the opening of the slot and the coil conductor, A filling material is filled between the bottom corner of the slot insulation side and the opposite corner of the coil conductor, and the coil conductor, the insulating spacer, and the wedge each communicate with a ventilation groove provided in the shaft. In a rotor of a rotating electric machine, the diameter of the ventilation hole of the insulating spacer is smaller on the coil conductor side than on the wedge side, and the diameter on the wedge side is smaller than the diameter of the wedge side. A rotor for a rotating electrical machine characterized by being larger than the side.