JPS5980128A - Device for fixing coil bar to slot of electric machine - Google Patents

Abstract

PURPOSE:To prevent the spring pressure of the end of a wavy spring disposed in a box under a wedge for elastic support by rounding the end of the spring, thereby preventing the wear and the contamination of the contacting surface with the end of the spring and suppressing the formation of a slot. CONSTITUTION:A slot spacer 12 is formed at the intermediate to be superposed, and coil bars 1, 11 surrounded by an insulator 10 are disposed in the slot 4 of a stator core 5. Since the coil bars 1, 11 are elastically supported in the slot 4, a wavy spring 8 which is rounded at 8a is disposed at both ends of the wavy spring in a longitudinal direction of a box 9 under a wedge 6. The wear of the box 9 as the contacting surface is prevented by the round 8a of the end of the spring, the contamination in the machine due to worn chips is prevented, and the formation of the slot due to the wear is suppressed, thereby preventing the spring pressure of the end of the spring from decreasing.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a device for fixing a coil bar to a groove of an electric machine.
In particular, the present invention relates to a device for fixing a coil bar to a groove in an electric machine, which is suitable for preventing wear on the contact surface of a wave spring end.

[Prior art]

All non-magnetic metal springs are installed under the wedge to suppress electromagnetic vibration of the stator coil bar.The springs, which do not have rounded ends, are housed in a multi-tube storage box divided in the stacking direction of the stator core. Placed under the wedge, the pressure of this spring directly suppresses conductor vibration within the slot, thereby avoiding vibration wear and discharge wear of the conductor insulating layer under high electric fields.

However, with this method of fixing the coil bar, both ends of the spring of the stator coil bar holder are not rounded, which causes wear on the contact surface with the end of the wave spring, which shortens the life of the storage box, and generates wear particles. Accumulate on board. In addition, there was a drawback that grooves formed by wear caused the spring pressure at the end of the corrugated spring to decrease, causing the waveform to fray.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a wave spring that prevents wear of the contact surface with the end face of the wave spring.

[Summary of the invention]

A feature of the present invention is that both ends of the wave spring are rounded. By rounding both ends of the wave spring, it is possible to prevent abrasion of the contact surface with the end of the wave spring, and also to prevent contamination of the interior of the machine due to abrasion powder. Furthermore, since the formation of grooves due to wear can be suppressed, a decrease in spring pressure at the end of the wave spring can also be prevented.

[Embodiments of the invention]

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

Seven coil bars 1.11 are stacked in the groove 4 of the stator core 5. Both bars 1.11 are constructed in the same way and are surrounded by an insulator 10. both bars 1,
A groove spacer 12 is provided between the grooves 11, while the groove is closed at the upper end by a cutout 6 which is inserted in a dovetail-like manner into a notch in the groove side.

1 in order to elastically support both bars 1.11 in the groove 4.
! A wave spring 8, which is waved in the longitudinal direction and has rounded ends at both ends, is arranged in the storage box 9 below the storage box 9, and the installed state of this wave spring is shown in the perspective view of FIG. According to this embodiment, the roundness 8a of the end of the wave spring prevents the storage box 9, which is the contact portion, from being worn out, and prevents the inside of the machine from being contaminated by abrasion powder.

Furthermore, since the formation of grooves due to wear can be suppressed, a decrease in the spring pressure at the end of the wave spring can be prevented.

〔Effect of the invention〕

According to the present invention, the friction between the vibration of the coil bar and the contact surface of the wave spring is reduced, the abrasion of the contact portion can be prevented, and the interior of the machine can be prevented from being contaminated by abrasion powder. Furthermore, it is possible to prevent the formation of cavities in the storage box due to wear, and it is possible to prevent a decrease in the spring pressure at the end of the wave spring.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the inside of a slot showing a method of supporting the wave spring according to the present invention and a storage box, and FIG. 2 is a perspective view of the wave spring according to the present invention.

Claims (1)

[Claims] 1. Equipped with a non-magnetic, high-resistance wave spring under the wedge,
A device for fixing a coil bar in a groove of an electric machine, wherein the wave spring is isolated from a slot and is housed in a storage box, and the device is characterized in that both ends of the wave spring are rounded.