JPS5852420B2 - Rotating electrical machine winding end connection insulator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a connection insulating device at a winding end of a rotating electric machine.

At the end of the armature winding of a synchronous machine, an induction machine, etc., as shown in Fig. 1, the series connection part 4 of each pole and each phase is wrapped one by one with insulating tape such as mica tape or polyester tape. By doing so, the connection portion insulator 5 is applied.

Therefore, although the insulation properties of the connection parts are excellent, the rigidity of the armature winding ends is low and the mechanical strength is weak.

SUMMARY OF THE INVENTION An object of the present invention is to provide a connection insulating device that can increase the rigidity of a winding end and increase its mechanical strength.

In order to achieve this object, the present invention abuts continuous strip insulators from both sides of a plurality of connecting portions arranged in the circumferential direction at intervals, and these strip insulators It is characterized by covering and insulating the connection part.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

FIG. 2 is a sectional view showing the stator end of a rotating electrical machine equipped with a connection insulator according to an embodiment of the present invention, and FIG. 3 is a view of the connection insulator shown in FIG. 2 from the direction of arrow P. This is a developed diagram.

The armature winding 3 is housed in the slot of the stator core 2, which is fastened and supported by the stator end plate 1. The parts are connected to each other by a series connection part 4.

This series connection part 4 is electrically insulated by a connection part insulator 5, and in this embodiment, a band-shaped insulating material having at least one long fiber, for example, Tetron nonwoven fabric 6, glass cloth as shown in FIG. T and laminated mica sheet 8
Insulation is performed using a band-shaped insulating material 9 formed by overlapping the two.

That is, before connecting the ends of the windings, the inner insulation consisting of an appropriate number of overlapping strips of insulating material 9 is applied over all the ends of the windings arranged circumferentially at intervals. body 5A
is placed in contact with the head 3A of the winding end, and after connecting the winding ends on that row side, all the connecting parts 4 are sandwiched between the inner insulator 5A. In this way, row-side insulators 5B made of band-shaped insulating material 9 are disposed over the entire circumference, and all the connecting portions 4 are covered with these inner and row-side insulators 5A and 5B.

Thereafter, an insulating tape 10 is wound so as to straddle both the inner and row side insulators 5A and 5B located between each connection part 4, that is, between the adjacent ends of the windings, and these are tightened. While bringing the bodies 5A and 5B into close contact with each other,
The circumferential spacing between each connecting portion 4 is maintained.

At the ends of the windings where the connecting portion 4 is insulated in this way, inner and row side insulators 5A and 5B made of strip-shaped insulating material having long fibers in the longitudinal direction are continuously disposed over the entire circumference. Therefore, its rigidity is high, and it has sufficient mechanical strength to withstand even when the end of the armature winding is subjected to an electromagnetic force several times more than that during steady operation, such as in the case of a three-phase short circuit. It will be done.

In addition, from the viewpoints of work and usage environment, it is recommended to use prepreg material impregnated with resin and semi-cured as the inner and row side insulators before disposing them as described above. It's advantageous.

Further, as the long fibers to be contained in the inner and row side insulators, it is desirable to use materials as rigid as possible, such as glass fibers.

As explained above, according to the present invention, continuous band-shaped insulators are brought into contact with each other from both sides of a plurality of connection parts disposed in the circumferential direction at intervals, and these band-shaped insulators are is tightened between adjacent winding ends using tightening tape, each connection can be effectively insulated, and the winding ends can be reinforced by the band-shaped insulator commonly applied to each connection. Mechanical strength can be increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the stator end of a rotating electric machine equipped with a conventional connection insulating device, and FIG. 2 is a stator end of a rotating electric machine equipped with a connection insulating device according to an embodiment of the present invention. FIG. 3 is a developed view of the connection insulating device shown in FIG. 2 as seen from the direction of arrow P, and FIG. 4 is a perspective view showing an example of the strip-shaped insulating material used in the connection insulating device of the present invention. It is a diagram. 3... Armature winding, 4... Series connection part, 5... Connection part insulator, 5A...
Inner insulator, 5B...Row side insulator, 10...
...Tightening tape.

Claims (1)

[Claims] 1 Connect the winding ends that protrude from the core end to the row part,
In a device in which the connecting portions are insulated by covering them with an insulator, continuous strips are formed in the circumferential direction from both sides, spanning the plurality of connecting portions arranged circumferentially at intervals, and sandwiching the connecting portions. What is claimed is: 1. An insulating device for connecting portions of winding ends of a rotating electrical machine, characterized in that insulators are brought into contact with each other and both band-shaped insulators are tightened between adjacent winding ends with a tightening tape.